WORLDTECH LCD LTD
APPROVAL SHEET
Customer :
Part Name
:
LCD MODULE
Model NO. : GDM240128A
Drawing NO. :
Approved by :
Date : 2005.06.03
Approved by
Checked by
Prepared by
Sheet code
2005-06-03
T
User's Manual
- 1 -
CONTENTS
1. Scope -------------------------------------------------------------2
2. Warranty ---------------------------------------------------------2
3. Features ---------------------------------------------------------2
4. Dimensional outline -----------------------------------------6
5. I/O terminals ----------------------------------------------------7
6. Quality level ---------------------------------------------------23
7. Reliability ------------------------------------------------------26
8. Handling precautions --------------------------------------26
9. Precaution for use ------------------------------------------28
10.Appendix -------------------------------------------------------28
User's Manual
- 2 -
1. Scope
This manual defines general provisions as well as inspection standards for
LCD module supplied by Worldtech LCD LTD
If the event of unforeseen problem or unspecified items may occur, please
contact the nearest supplier or our company for solution.
2. Warranty
If module is not stored or used as specified in this manual, it will be void the
12 months warranty.
3. Features
3-1. Features:
Display Mode:
Transflective and Positive type
STN
LCD
Display Color:
Display Dots:
Black
Background:
Light
Gray
Display Format:
240(w)
128(h) full dots
Input Data:
8-bits parallel data interface from a MPU
Multiplexing Ratio:
1/128 Duty
Viewing Angle: 6 o'clock
Back Light:
LED backlight White
Display RAM Capacity: 32k byte S-RAM (built-in)
Controller Type:
T6963C (built-in)
CG ROM/RAM Capacity: Built-in 128 words character generator (CG) ROM.
3-2
Mechanical Specifications:
Item Specifications
Unit
Dimensional Outline
144.0(W)
104.0(H)
16.0 Max.
mm
Number of Dots
240(W)
128(H) Dots
--
Number of Characters
40C
16L(640) in case of 6
8 Fonts
30C
16L(480) in case of 8
8 Fonts
--
Viewing Area
114.0(W)
64.0(H) mm
Active Area
107.95(W)
57.55(H) mm
Dot Pitch
0.45(W)
0.45(H) mm
Dot Size
0.40(W)
0.40(H) mm
Weight Approx.
180
g
User's Manual
- 3 -
3-3
Absolute Maximum Rating
Item Symbol
Min.
Max.
Unit
Note
Logic Vdd
-0.3
7.0
V
Vss=0V
Supply
Voltage
LCD drive
Vdd Vee
0
28
V
Input Voltage
Vi
-0.3
Vdd+0.3
V
Vss=0V
Operating Temperature Top
-10
60
Storage Temperature
Tstg
-20
70
Humidity --
--
90
%RH
3-4
Electrical Characteristics:
3-4-1. Electrical Characteristics
Note: <1> Duty =1/128 <2> All dots on static state
Item Symbol
Conditions
Min.
Typ.
Max.
Unit
Logic
Vdd
4. 5
5.0
5. 5
Supply
Voltage
LCD drive
VddVee
-- 20
25.0
"H" Level
Vih
Vdd=5V
5% Vdd-2.2
-- Vdd
Input
Voltage
"L" Level
Vil
0
--
0.8
"H" Level
Voh
Vdd=5V
5% Vdd-0.3
-- Vdd
Output
Voltage
"L" Level
Vol
0
--
0.3
V
Frame Frequency
Fflm
Vdd=5V
70
75
80
Hz
Logic Idd
--
5.7
10.0
Current
Consumption LCD drive
Iee
Vdd=5V
VddVee=20.0V
Fflm=75Hz
-- 5.4
9.8
mA
Ta= -10
=0
,
=0
-- 20.8
--
Ta= 25
=0
,
=0
-- 20.0
--
LCD Driving Voltage
(Recommended Voltage)
VddVee
Ta= 60
=0
,
=0
-- 19.5
--
V
3-4-2 Specifications for E/L backlight
Standard Values
Item Unit
Min. Typ.
Max.
Conditions
Supply Voltage
V
--
5.0
--
--
Supply Frequency
mA
--
72
--
DC5.0 Vrms, Dark room
Lifetime Hrs
10000
Note
<1>
Luminous Color
--
White
DC5.0Vrms, Dark room
Operating Temperature
-30~70
--
Storage Temperature
-40 ~ 85
--
Note<1>: Half value of initial brightness at 20
60%RH
User's Manual
- 4 -
3
-5
Electro-optical Characteristics:
Item
Symbol
Temp.
Conditions Min. Typ. Max. Unit
Note
-10
--
20.8
24.0
25
--
20.0
--
LCD Driving Voltage
(Recommended voltage)
Vop
60
=0
,
=0
-- 19.5 --
V 1,2,5
0
--
1500
2000
Rise Time
tr
25
--
150
200
0
--
3000
3500
Response
Time
Decay
Time
td
25
=0
,
=0
-- 200 250
mS 1,3,5
Vertical -35 -- 35
Viewing Angle
25
Horizontal -30 -- 30
deg. 1,4,5
Contrast Ratio
K
25
=0
,
=0
2.0 5.0 -- --
1,5,6
Note: <1> Definition of
and
<2> Contrast ratio higher than 2 (k
2)
can be obtained in this voltage range.
Note: <3>Definition of response time waveform
Positive Display
Negative Display
User's Manual
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Note: <4>Definition of viewing angle Note: <5> Optical measuring system
(
)
=|
1-
2| temperature regulated chamber
Note: <6> Definition of Contrast Ratio (K)
Positive Display
Negative Display
Brightness of non-selected dot (B2)
Brightness of selected dot (B1)
Contrast Ratio (K)
=
User's Manual
- 6 -
4. Dimensional Outline
User's Manual
5. I/O terminals
Note: The following explanation is applied for the module without built-in voltage
converter.
5-1. I/O
Connection
Pin No,
Symbol
Function
1 VSS
Signal
ground(GND)
2
VDD
power supply for logic(+5V)
3 V0
Contrast
adjustment
4
C/D
H/L Register select signal
5
RD
Data read (Active at "L")
6
WR
Data write (Active at"L")
7~14 D0~D7
Data
Bus(D0=LSB,D7=MSB)
15
CE
Data read (Active at "L")
16 RES
Reset
signal
17
VEE
Power supply for LCD drive
18 MD2
H=32,L=40
19 FS
Font Select: Connected to Vdd: 6
8 dots font
Connected to Vss: 8
8 dots font
20
LED+
Power supply for backlight
5-2
Signal Timing Diagram:
Item Symbol
Condition
Min.
Max.
Unit
C/D set-up time
tcds
100
--
C/D hold time
tcdh
10
--
CE,RD,WR pulse width
tcp,trp,twp
80
--
Data set-up time
tds
80
--
Data hold time
tdh
40
--
Access time
tacc
--
150
Output hold time
toh
Vdd=5V
5%
Vss=0V
Ta=25
10 50
ns
- 7 -
User's Manual
- 8 -
5-3. Example of Power Supply
NC
Note: There is an end on the potentiometer for regulating contrast ratio.
5-4. Circuit Block Diagram
The circuit block diagram is shown in the following figure. The LCD module needs
two power sources: Vdd for logic and Vee for LCD drive.
Note: It is necessary to guard all signals from external noise as signal lines are
directly connected to C-MOS and are not pull-up or pull-down internally.
5-5
Application features of module:
1
This module can be directly connected to 8080MPU or Z80MPU.
2
This module can be set to display in combined display of graphic and text
User's Manual
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(Contents of the text area and of the graphic area are displayed on the
screen simultaneously by mode set.) and in attribute display of text mode.
3
MPU can access the DDRAM at any time in the mode of byte / bit
operation.
4
Character Font: 6
8 dots or 8
8 dots
5
A status check must be performed before data or command are read or
written.
6
Both the column/line counter and display register are cleared by RESET.
(Other registers are not cleared.) DDRAM is kept intact. Disable the
display using the clear-display register. After power on, it is necessary to
reset by software.
7
By the hardware setting, display columns are defined 40 characters long,
maximum transferable amount of data every line.
8
Display lines are defined 128 by hardware setting.
9
This module has a 128-word character generator ROM (see appendix),
and allocation of external character generator RAM can be made easily in
DDRAM.
10
DDRAM can be allocated to text area, graphic area and external
character area. The text home address and the graphic home address
correspond to the display bit on the top left corner of the LCD panel. In 6
8 dot matrix, one byte in the text area corresponds to a character on
the screen. One byte in graphic area corresponds to 6
1 dot matrix on
the screen (The lower 6 bits of a byte are valid).
11
Cursor display mode is on only in the text mode and what is displayed is
the logic OR of cursor and the character where the cursor is.
12
For some commands that need operand data, it is important to send the
operand data first and then the command code.
13
Text Attribute mode is only applicable in text mode. (In this case, text
mode and graphic mode should both be on.)
14
The relationship between Text Area and display position in LCD panel is
shown below:
TH TH+1 ...
TH+CL
TH+TA TH+TA+1 ...
TH+TA+CL
(TH+TA
+TA (TH+TA
+TA+1 ...
TH+2TA+CL
(TH+2TA
+TA (TH+2TA
+TA+1 ... TH+3TA+CL
... ...
...
...
TH+15TA TH+15TA+1 ...
TH+15TA+CL
User's Manual
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Note: TH: the text home address
TA: the width of text area (number of characters /line), to be defined by user.
CL: number of characters/line set by hardware, the CL of this module is 40.
15
The relationship between Graphic Area and display position in LCD panel
is shown below:
GH
DB7~DB0
GH+1
... GH+CL
GH+TA GH+TA+1
...
GH+TA+CL
(GH+TA
+TA (GH+TA
+TA+1 ...
GH+2TA+CL
(GH+2TA
+TA (GH+2TA
+TA+1 ... GH+3TA+CL
... ... ...
...
GH+127TA GH+127TA+1
...
GH+127TA+CL
Note:
GH: the graphic home address
TA: the width of graphic area (number of characters /line), to be defined by
user.
CL: number of characters/line set by hardware, the CL of this module is 40.
Note: In Text mode or Graphic mode, when TA
CL, the relationship between the
valid display area of the LCD panel and DDRAM address is detailed in
5-6-2.
5-6
Commands
The command of this module may have one operand datum, or two operand
data or none). It is important to send the data first, and then to send the
command code. If the number of the operand data is more than specified, the
last are valid. The status check must be performed every time before the data
and commands are read or written.
The status word format is as follows:
STA7 STA6
STA5
STA4 STA3
STA2
STA1
STA0
STA0: check command execution capability 1: enable 0: disable
STA1: check data read/write capability
1: enable 0: disable
STA2: check auto mode data read capability 1: enable 0: disable
STA3: check auto mode data write capability 1: enable 0: disable
STA4: not used
STA5: check controller operation capability 1: enable 0: disable
STA6: error flag. Used for screen peek and screen copy commands
1: error 0: no error
STA7: check the blink condition 1: normal display 0: display off
Note:
1. It is necessary to check STA0 and STA1 at the same time. There is a
possibility of erroneous operation due to a hardware interrupt.
2. For most modes STA0/STA1 are used at a status check.
User's Manual
- 11 -
3. STA2 and STA3 are valid in auto mode; STA0 and STA1 are invalid.
4. STA6 is valid in screen peek and screen copy mode.
5. STA5 and STA7 mirror the interior operational status.
5-6-1
Registers Setting, the format is as follows: D1,D2
0 0 1 0 0 N2
N1
N0
D1, D2 is the first and the second parameters respectively, and the last byte is
command code. According to the values of N0, N1, N2, this command has
three meanings.
D1
D2
Code
Function
X Address
(lower 7 bits are valid)
Y Address
(lower 5 bits are valid)
21H (N0=1)
Set cursor pointer
Address
(lower 5 bits are valid)
00H
22H (N1=1)
Set offset register
Low address
High address
24H (N2=1)
Set address pointer
A
Set cursor pointer: D1 stands for the horizontal distance (number of
characters) of cursor to the top left corner of the real LCD panel. D2 stands
for the vertical distance (number of character lines). Setting and changing
the cursor position must be performed through resetting the cursor pointer.
The cursor pointer is not related to address pointer and has no auto
change function.
B
Set CGRAM offset register: Set the high 5 bits of CGRAM's 16 bit address
in DDRAM. The actual address of CGRAM is:
Offset Adrs: C4 C3 C2 C1 C0
Char. Code: D7 D6 D5 D4 D3 D2 D1 D0
Line Adrs : +
R2 R1 R0
Actual.Adrs.: A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
R2~R0: represent one line of the self-designed 8X8 dots characters.
When the internal CGROM mode is set in mode set, the character code
allocated to external character generator is 80H~FFH. When the external
CGROM mode is set in mode set, the character code allocated to the
external character generator is 00H~FFH.
For example: when allocate the units of 1800H~1FFFH
2K
in DDRAM to
CGRAM, the offset register could be set to #03H. Thus, the address of
character whose code is 80H in DDRAM is 1C00H~1C07H.
B
Set address pointer: set the unit address of DDRAM to be accessed. D1
and D2 are the low address and high address of the unit address
respectively.
5-6-2
Control word setting, the command format is as follows: D1, D2
0 1 0 0 0 0 N1
N0
According to different values of N1 and N0, this command has four functions:
User's Manual
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N1 N0
D1
D2
Code
Function
0 0
Low adrs.
High adrs.
40H
Set text home address
0 1
Columns
00H
41H
Set text area
(number of characters/line)
1 0
Low adrs.
High adrs.
42H
Set graphic home address
1 1
Columns
00H
43H
Set graphic area
(number of characters/line)
The text home address corresponds to the character position on the top left
corner of display panel. The graphic home address corresponds to the byte
position on the top left corner of display panel. The text area (number of
characters/line) set and graphic area (number of characters/line) set are used
to adjust the width (column) of valid display screen. The width indicates the
number of character or the number of bytes can be validly displayed.
Define the width of display screen to be CL by hardware and the width of
display screen to be TA by this command
then the relationship between text
area and its corresponding position on LCD panel is shown as follows:
a
when TA<=CL:
TH stands for the text home address
TH ......
TH+TA-1
TH+TA ......
TH+2TA-1
...... ...... ......
...... ...... ......
Blank
------------------ TA valid display screen ------------------
------------------------------------------- CL -----------------------------------------------
b
when TA>CL:
TH ......
TH+CL-1
......
TH+TA-1
TH+TA ......
TH+TA+CL-1
......
TH+2TA-1
...... ...... ......
...... ...... ......
do not transfer
------------------ CL valid display screen --------------------
------------------------------------------- TA -----------------------------------------------
The way in which the graphic area corresponds to its position in display
screen is similar to the way in which the text area corresponds to its position in
display screen. The only difference is that in graphic area one byte
corresponds to 8 bits graphic data.
If the graphic area is defined to be the same number of characters/line of LCD,
the home address of every line equals to end address of the previous line +1.
5-6-3
Mode setting, the format of command is as follows: no parameter
1 0 0 0 N3
N2
N1
N0
N3: select character generator mode
User's Manual
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N3=1, select CGRAM and the character code is 00~FFH.
N3=0, select internal CGROM. Since the character code of CGROM is
00~7FH, when take 80H~FFH as character code, CGRAM is automatically
selected.
N2~N0: Combined-display mode setting. The functions are shown below:
N2 N1 N0
Means of Combination
0 0 0
"OR" mode
0 0 1
"EXOR
"
mode
0 1 1
"AND" mode
1 0 0
Text attribute mode
Only when the text mode and graphic mode are both on, the combined display
mode and text attribute mode settings are valid. After the text attribute setting,
the graphic area will be converted into text attribute area and store the text
attribute codes. The text attribute area is of the same size as text area. In
addition, the text attribute codes of the character codes in text area are stored
in the same address of graphic area. Every byte in the graphic area
determines the feature of its corresponding character, including the normal
display, reverse display, inhibit display, blink of normal display, blink of reverse
display and blink of reverse display of characters. In the text attribute area, the
text attribute codes of characters are made up with a byte's low four bits.
D7 D6 D5 D4 D3 D2 D1 D0
* * * * d3
d2
d1
d0
d3: blink control. 1-blink, 0-no blink
d2~d0 :
d2 d1 d0
Function
0 0 0
Normal display
1 0 1
Reverse display
0 1 1
Inhibit display
To work in the text attribute mode, the user could build an independent area in
the DDRAM as text attribute area. In this case, the graphic home address
should be converted into the text attribute home address, and thus keep the
data in the previous graphic area. DDRAM could be divided as follows:
Graphic area
Text attribute area
Text area
CGRAM
2K
5-6-4
Display mode setting, the format of command is as follows: no
parameter
1 0 0 1 N3
N2
N1
N0
User's Manual
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N0: 1/0, cursor blink on/off
N1: 1/0, cursor display on/off
N2: 1/0, text display on/off
N3: 1/0, graphic display on/off
5-6-5
Cursor pattern select, format is shown as below: no parameter
1 0 1 0 0 N2
N1
N0
The cursor pattern in 8 dots(segment)
N(line). The value of N is in the
range of 1 line to 8 lines (00H~07H).
5-6-6
Data auto read/write mode: no parameter
1 0 1 1 0 0 N1
N0
Using this command, MPU could continuously read/write the data in
DDRAM without inputting the read/write command every time. The address
pointer is automatically increased by 1 after each datum. The Auto reset
command must be sent after all data have been sent, to clear Auto mode.
N1 and N0 function as below:
N1 N0
Code
Function
0 0
B0H
Set data auto write
0 1
B1H
Set data auto read
1 *
B2H/B3H
Auto reset
5-6-7
Data read/write mode, the format is shown below: D1,
1 1 0 0 0 N2
N1
N0
D1 N2 N1 N0 Code function
Data 0 0 0 C0H Data write, ADP+1
Data 0 0 1 C1H Data read, ADP+1
Data 0 1 0 C2H Data write, ADP-1
----
0 1 1 C3H Data read, ADP-1
Data 1 0 0 C4H Date write, same ADP
----
1 0 1 C5H Date read, same ADP
5-6-8
Screen peek, the format of command is as follows: no parameter
1 1 1 0 0 0 0 0
This command is used to transfer 1 byte of displayed data positioned by
current address pointer to the data stack; this byte can then be read from
the MPU by data access. The logical combination of text and graphic
display data on the LCD screen can be read by this command. The address
pointer should be set in graphic area.
5-6-9
Screen copy, the format of command is as follows: no parameter
1 1 1 0 1 0 0 0
The command copies a single raster line of data positioned by the address
pointer (in graphic area) to the corresponding area in the graphic area. If the
User's Manual
- 15 -
attribute function is being used, this command is not available.
5-6-10
Bit set/reset: no parameter
1 1 1 1 N3
N2
N2
N0
This command is used to set or reset a bit of the byte specified by the
address pointer.
N3=1, set; N3=0, reset. N2~N0 corresponds to the D0~D7 bit.
5-7. Module and MPU connection
MPU uses data bus and control lines to control the module by means of direct
storage access or I/O access. Interface circuit is shown in following diagram:
MPU: 8031
Data bus of 8031 is connected directly to the data bus of module. RD and WR of
8031 act as the read/write control signal of module. CE can be decoded by
address bus. For example: output Y0 of IC 138 as CE.
When test the module
independently, CE could be grounded directly. ) Output A0 of 8031 address bus as
C/D. A0=1 stands for the address of command
A0=0 stands for address of data.
Each Subprogram is as follows:
1
Status read
Registers to be used: R0, A; output register: A store status
BF: MOV R0, #01H ; address of command
MOVX A, @ R0 ; read status
RET
User's Manual
- 16 -
Relevant subprograms could be derived from above-mentioned program:
a. Subprogram of STA0 and STA1 status check, Before the command write
and data write and read
STA0 and STA1 should both be defined to be "1":
BF1: LCALL BF
JNB ACC.0, BF1 ; STA0 status check
JNB ACC.1, BF1 ; STA1 status check
RET
b. Subprogram of STA2 status check, STA2 should be checked between
reading of each datum. STA2=1 should be confirmed before each reading
during the continuous reading.
BF2: LCALL BF
JNB ACC.2, BF2 ;STA2 status check
RET
Similarly, subprogram of STA3 status check is listed as follows:
BF3: LCALL BF
JNB ACC.3, BF3 ; STA3 status check
RET
c. After the screen peek and screen copy commands, the STA6 status should
be checked. STA6=0 indicates that the commands are correctly performed.
For example:
BF6: LCALL BF
JB ACC.6, ERR ; STA6 status check
RET
ERR:
; error disposal program
2
subprogram of writing command and data
register to be used: R0, R2, R3, R4, A:
input register: R2 is the first parameter, R3 is the second parameter
R4 is the
command code
WR: LCALL BF1 : entrance of double parameter command
MOV A, R2
LCALL WR4
WR1: LCALL BF1 ; entrance of single parameter command
MOV A, R3
LCALL WR4
WR2: LCALL BF1 ; entrance of no parameter command
User's Manual
- 17 -
MOV A, R4
SJMP WR5
WR4: MOV R0, #00H ; entrance of writing data
WR5: MOVX @ R0, A
RET
This program is generally used. When entering data and single parameter
commands, the data and commands should be sent into R3. The entrance of
subprogram is WR4 and WR1 respectively. The entrance of no parameter
command is WR2.
3
subprogram of data writing
register to be used: R0, A; output register: A store data
RD: LCALL BF1
MOV R0, #00H
MOVX A, @ R0
RET
5-8
Example of Application Program
The precondition is FS=0, that is, choose the 8X8dots.
5-8-1. Subprogram of clearing DDRAM
CLR: MOV R2, #00H ; RAM address=0000H
MOV R3, #00H
MOV R4, #24H ; set address pointer
LCALL WR
MOV R4, #0B0H ; set data auto write
LCALL WR2
MOV R2, #1FH ; auto write 8K byte
CLR1: MOV R3, #0FFH
CLR2: LCALL BF3 ; check status STA3
CLR A
LCALL WR4 ; write 00H
DJNZ R3, CLR2
DJNZ R2, CLR1
MOV R4, #0B3H ; auto reset
LCALL WR2
RET
5-8-2.
Subprogram of Initialization
INI: LCALL CLR
MOV R2, #00H ; set text area
User's Manual
- 18 -
MOV R3, #00H
MOV R4, #40H
LCALL WR
MOV R2, #1EH
MOV R3, #00H
MOV R4, #41H
LCALL WR
MOV R2, #00H ; set graphic area
MOV R3, #08H
MOV R4, #42H
LCALL WR
MOV R2, #1EH
MOV R3, #00H
MOV R4, #43H
LCALL WR
MOV R4, #80H ; set display mode
LCALL WR2
MOV R4, #94H ; text on
LCALL WR2
RET
The following is an example which is to display
""
in the top left corner of the
screen.
LCALL INI
MOV R2, #00H
MOV R3, #00H
MOV R4, #24H
LCALL WR
MOV R3, #01H
MOV R4, #0C0H
LCALL WR1
RET
5-8-3. Set CGRAM
Set offset register content
1
Set the matrix data and character codes of the characters. For
example, the Chinese character
""
, choose the character codes
between 80H and FFH, then the matrix data and character codes
of the character "
" are defined as follows:
Structure of
""
matrix data character code
Top left 04H, 04H, 04H, 04H, 04H, 7CH, 04H, 04H 80H
Bottom left 04H, 04H, 04H, 04H, 1CH, E4H, 44H, 00H 81H
Top right 80H, 80H, 88H, 98H, A0H, C0H, 80H, 80H 82H
User's Manual
- 19 -
Bottom right 80H, 80H, 80H, 8CH, 82H, 82H, 7EH, 00H 83H
Write into CGRAM
WRCG: MOV R2, #03H
MOV R3, #00H
MOV R4, #22H ; set offset register
LCALL WR
MOV DPTR, #TAB1 ; matrix data home address
MOV R2, #00H
MOV R3, #1CH ; CGRAM address
MOV R4, #24H ; set address pointer
LCALL WR
MOV R4, #0B0H ; set auto write
LCALL WR2
MOV R2, #20H ; number of matrix data
WRCG1: LCALL BF3 ; check status STA3
CLR A
MOVC A, @A+DPTR ; read matrix data
LCALL WR4 ; write into CGRAM
INC DPTR
DJNZ R2, WRCG1
MOV R4, #0B2H ; auto reset
LCALL WR2
RET
TAB1: DB 04H, 04H, 04H, 04H, 04H, 7CH, 04H, 04H
DB 04H, 04H, 04H, 04H, 1CH, 0E4H, 44H, 00H
DB 80H, 80H, 88H, 98H, 0A0H, 0C0H, 80H, 80H
DB 80H, 80H, 80H, 80H, 82H, 82H, 7EH, 00H
5-8-4. Chinese Characters Display
Matrix data of Chinese character are in the sequence of top left corner
8 bytes
from top to bottom
left bottom left corner
8 bytes from top to bottom
top
right corner (8 bytes from top to bottom
bottom right corner(8 bytes from top
to bottom
.
1
Display of Chinese Character in Text Mode
In this mode, only 64 Chinese characters with 16X16 dots can be entered as a
maximum. (4 character codes for a Chinese character)
The address pointer is already positioned on the top left corner of the character
to be entered.
Register to be used: R2, R3, R4, A; input register: R3
store Chinese character
codes
User's Manual
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WRHZT: MOV R4, #0C0H ; data write
address+1
LCALL WR1 ; R3 set in the main program, for
example R3=80H
INC R3
INC R3
LCALL WR1 ; R3=82H
DEC R3 ; R3=81H
MOV R2, #1CH
MOV R4, #0C1H ; data read, address+1
WRHZT1: LCALL WR2
DJNZ R2, WRHZT1 ; move the address pointer to the
left bottom corner of the
Chinese character
MOV R4, #0C0H
LCALL WR1
INC R3
INC R3 ; R3=83H
LCALL WR1
RET
2
Display of Chinese character in the graphic mode
This method is to build a Chinese character storage area in the ROM of
MPU system, the Chinese character matrix should be input byte by byte in
graphic mode.
Register to be used: A, R2, R3, R4
DPTR is a home address of one Chinese character matrix array and will be
assigned in the main program.
WRHZG: MOV R2, #10H ; number of cycles
MOV A, #00H
WRHZG1: PUSH ACC ; push code into stack
MOVC A, @A+DPTR ; read character matrix
MOV R3, A
MOV R4, #0C0H
LCALL WR1
POP ACC ; pop code from stack
PUSH ACC ; push code into stack
ADD A, #10H ; locate the pointer to the matrix of
the byte on the right
MOVC A, @A+DPTR ; read character matrix
MOV R3, A
LCALL WR1
User's Manual
- 21 -
MOV A, R2
MOV R3, A ; R3=R2
MOV R2, #1CH ; number of cycles
MOV R4, #0C1H
WRHZG2: LCALL WR2 ; change the address pointer
DJNZ R2, WRHZG2
MOV A, R3
MOV R2, A ; recover R2
POP ACC ; pop code of stack
INC A ; code+1
DJNZ R2, WRHZG1
RET
5-8-5. Application
of
Text Attribute Mode
Display the character string "WELCOME!" on the top left corner of the screen:
"WELCOME
"
, blink of reverse display;
""
, normal display. The subprogram
is TCR
in which TAB2 acts as character code and TAB3 as corresponding
text attribute code.
TCR:
MOV R4, #9CH ;start the text and graphic mode
LCALL WR2
MOV R4, #84H ; text attribute mode set
LCALL WR2
MOV R2, #00H
MOV R3, #00H
MOV R4, #24H ; address pointer set
LCALL WR
MOV R2, #00H ; number of characters
TCR1: MOV DPTR, #TAB2 ; table of characters
MOV A, R2
MOVC A, @A+DPTR
MOV R3, A
MOV R4, #0C0H
LCALL WR1
INC R2
CJNE R2, #08H, TCR1
MOV R2, #00H
MOV R3, #08H
MOV R4, #24H ; address pointer set
LCALL WR
MOV R2, #00H ; number of characters
TCR2: MOV DPTR, #TAB3 ; table of characters
MOV A, R2
User's Manual
- 22 -
MOVC A, @A+DPTR
MOV R3, A
MOV R4, #0C0H
LCALL WR1
INC R2
CJNE R2, #08H, TCR2
RET
TAB2:
DB 37H, 25H, 2CH, 23H, 2FH, 2DH, 25H, 01H
TAB3:
DB 0DH, 0DH, 0DH, 0DH, 0DH, 0DH, 0DH, 08H
5-8-6. Application Program
For example, to display
""
on the top left corner of the screen, the program is:
ORG 0000H
STAR: LCALL INI ; initialize
MOV R2, #00H ; display
"
"
MOV R3, #00H
MOV R4, #24H
LCALL WR
MOV R3, #01H
MOV R4, #0C0H
LCALL WR1
RET
The flow chart of this program is as follows:
END
DISPLAY CHAR.S
TEXT ON
SET GRAPHIC AERA
SET DISPLAY MODE
SET TEXT AERA
CLEAR DDRAM
User's Manual
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6. Quality level
6-1.
Inspection conditions
6-1-1.
The environmental conditions for inspection shall be as follows:
Room temperature:
20
3
Humidity:
65
20% RH
6-1-2. The external visual inspection:
Using a 20W fluorescent lamp for illumination shall perform the inspection.
The distance between LCD and the inspector's eyes should be at least 30cm.
6-1-3. (1) Light method
(2) Inspection distance and angle
6-2. Sampling procedures for each item's acceptance level table
Defect type
Sampling procedure
AQL
Major defect
MIL-STD-105D Inspection Level I
Normal inspection
Single sample inspection
Q/ED-01-98(II)
Minor defect
MIL-STD-105D Inspection Level I
Normal inspection
Single sample inspection
Q/ED-01-98(II)
User's Manual
- 24 -
6-3. Classification of defects
6-3-1. Major defect
A major defect refers to a defect that may substantially degrade usability for
product applications.
6-3-2. Minor defect
A minor defect refers to a defect that deviates from existing standards
almost unrelated to the effective use of the product or its operation.
6-4 . Inspection standards
Item
Criterion for defects
Defect
type
1) Display on inspection
(1) Non display (2) Vertical line is deficient
(3) Horizontal line is deficient (4) Cross line is deficient
Major
2) Black
White spot
Size
(mm) Acceptable number
0.3 Ignore (note)
0.3<
0.45 3
0.45<
0.6 1
0.3<
0
(Note) Not allowed if four more spots crowd together
Minor
3) Black
White line
Length (mm) Width (mm) Acceptable number
L
10 W
0.03 Ignore
5.0
L
10 0.03<W
0.04 3
5.0
L
10 0.04<W
0.05 2
1.0
L
10 0.05<W
0.06 2
1.0
L
10 0.06<W
0.08 1
L
10 0.08<W follows 2) point defect
Defects separate with each other at an interval of more than 20mm.
Minor
4) Display pattern
[Unit: mm]
A+B
0.45 0<C D+E
0.35 F+G
0.35
2 2 2
Note: 1) Up to 3 damages acceptable
2) Not allowed if there are two or more pinholes every three-
fourths inch.
Minor
User's Manual
- 25 -
Item
Criterion for defects
Defect
type
5) Spot-like contrast
irregularity
Size
(mm) Acceptable Number
0.7 Ignore (note)
0.7<
1.0 3
1.0<
1.5 1
1.5<
0
Note: 1) Conformed to limit samples.
2) Intervals of defects are more than 30mm.
Minor
7) Scratches and dent on the
polarizer
Scratches and dent on the polarizer shall be in the accordance with
"2) Black/white spot", and "3) Black/White line".
Minor
8) Stains on the surface of
LCD panel
Stains which cannot be removed even when wiped lightly
with a soft cloth or similar cleaning.
Minor
9) Rainbow color
No rainbow color is allowed in the optimum contrast on state within
the active area.
Minor
10) Viewing area
encroachment
Polarizer edge or line is visible in the opening viewing area due to
polarizer shortness or sealing line.
Minor
11) Bezel appearance
Rust and deep damages that are visible in the bezel are rejected.
Minor
12) Defect of land surface
contact
Evident crevices that are visible are rejected.
Minor
13) Parts mounting
(1) Failure to mount parts
(2) Parts not in the specifications are mounted
(3) For example: Polarity is reversed, HSC or TCP falls off.
Major
14) Part alignment
(1) LSI, IC lead width is more than 50% beyond pad outline.
(2) More than 50% of LSI, IC leads is off the pad outline.
Minor
15) Conductive foreign
matter (solder ball,
solder hips)
(1) 0.45<
, N
1
(2) 0.3<
0.45, N
1
: Average diameter of solder ball (unit: mm)
(3) 0.5<L, N
1
L: Average length of solder chip (unit: mm)
Major
Minor
Minor
16) PCB pattern damage
(1) Deep damage is found on copper foil and the pattern is nearly
broken.
(2) Damage on copper foil other than 1) above
Major
Minor
17) Faulty PCB correction
(1) Due to PCB copper foil pattern burnout, the pattern is
connected, using a jumper wire for repair;2 or more places are
corrected per PCB.
(2) Short-circuited part is cut, and no resist coating has been
performed.
Minor
18) Bezel flaw
Bezel claw missing or not bent
Minor
User's Manual
- 26 -
Item
Criterion for defects
Defect
type
19) Indication on name plate
(sampling indication label)
(1) Failure to stamp or label error, or not legible (all acceptable if
legible).
(2) The separation is more than 1/3 for indication discoloration, in
which the characters can be checked.
Minor
7. Reliability
7-1 Lifetime
50,000 hours (25
in the room without ray of sun)
7-2 Items of reliability (See the next page)
Item Condition
Criterion
1) High
Temperature
Operating
60
96hrs
2) Low
Temperature
Operation
-20
96hrs
No cosmetic failure is allowable.
Contrast ratio should be between initial
value
10%.
Total current consumption should be below
double of initial value.
3) Humidity
40
, 90%RH, 96hrs
4) High
Temperature
70
96hrs
5) Low
Temperature
-30
96hrs
6) Thermal
shock
25
30
25
70
5(min) 30(min) 5(min) 30(min)
5 cycle, 55~60%RH
No cosmetic failure is allowable.
Contrast ratio should be between initial
value
20%.
Total current consumption should be below
double of initial value.
7) Vibration
10~55~10hz
amplitude: 1.5mm
2hrs for each direction
(X,Y,Z)
No defects in cosmetic and operational
function are allowable.
Total current consumption should be below
double of initial value.
8. Handling precautions
8-1 Mounting method
A panel of LCD module made by Dalian Eastern Display Co., Ltd. consists of
two thin glass plates with polarizers that easily get damaged.
And since the module is constructed and fixed by utilizing fitting holes in the
Printed Circuit Board (PCB), extreme care should be used when handling the
LCD modules.
8-2 Cautions of LCD handling and cleaning
User's Manual
- 27 -
When cleaning the display surface, wipe lightly with soft cloth with solvents
(recommended below).
Isopropyl alcohol
Ethyl alcohol
Trichlorotriflorothane
Do not wipe the display surface with dry or hard materials that may damage
the polarizer surface.
Do not use the following solvents:
Water
Ketene
Aromatics
8-3 Caution against static charge
The LCD module uses C-MOS LSI drivers. So we recommend you:
Connect any unused input terminal to V
dd
or V
ss
. Do not input any signals
before power turns on, and ground your body, work/assembly areas, and
assembly equipment to protect against static electricity.
8-4 Packaging
- A module employs LCD elements, and must be treated as such.
Avoid intense shock and falls from a height.
- To prevent modules from degradation, do not operate or store them
exposed direct to sunshine or high temperature/humidity.
8-5 Caution for operation
- It is an indispensable condition to drive LCD module within the limits of the
specified voltage since the higher voltage over the limits may cause the
shorter life of LCD module.
An electrochemical reaction due to DC (direct current) causes LCD
undesirable deterioration so that the uses of DC (direct current) drive
should be avoided.
- Response time will be extremely delayed at lower temperature than the
operating temperature range and on the other hand at higher temperature
LCD module may show dark color in them. However those phenomena do
not mean malfunction or out of order of LCD module, which will come back
in the specified operating temperature.
-
8-6 Storage
In the case of long time storage, the following ways are recommended:
- To be stored in polyethylene bag with the opening sealed so as to prevent
fresh air out. Do not put desiccant into the bag.
- To be placed in a dark place where there is neither exposure to direct
sunlight nor light. Keep within the storage temperature range.
- To be stored with no touch on polarizer surface by any thing else.
User's Manual
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8-7 Safety
- It is recommended to crash damaged or unnecessary LCD into pieces
and to wash off liquid crystal by either of solvents such as acetone and
ethanol, which should be burned up later.
- When any liquid leaked out of a damaged glass cell comes in contact
with your hands, please wash it off with soap and water at once.
9. Precaution for use
9-1 Both parties should provide a limit sample on an occasion when both parties
agree to its necessity.
The judgement by a limit sample shall take effect after the limit sample has
been established and confirmed by both parties
9-2 On the following occasions, the handling of problem should be decided through
discussion and agreement between responsible of the both parties.
- When a question is arisen in this manual.
- When a new problem is arisen which is not specified in this manual.
- Some problem is arisen due to the change of inspection and operating
conditions in users.
- When a new problem is arisen at the customer's operating set for sample
evaluation in the customer site.
10. Appendix
Character Code Table
PDF 
ZIP