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LM2028
LCD Module User Manual
Shenzhen TOPWAY Technology Co., Ltd.
Rev.
0.1 0.2
Descriptions
New release Revise LED Backlight Circuit Characteristics Add "Power Supply Highlight"
Release Date
2004-07-13 2004-11-20
URL:
www.topwaydisplay.com www.topwaysz.com
Document Name: LM2028-Manual-Rev0.2.doc Page: 1 of 9
TOPWAY
Table of Content
1.
1.1 1.2 1.3 1.4 1.5
LCD Module User Manual
LM2028
Basic Specifications................................................................................................................ 3
Power Supply Highlight .......................................................................................................................................... 3 Display Specifications ............................................................................................................................................ 3 Mechanical Specifications...................................................................................................................................... 3 Block Diagram........................................................................................................................................................ 3 Terminal Functions................................................................................................................................................. 4
2. 3.
3.1 3.2 3.3
Absolute Maximum Ratings.................................................................................................... 5 Electrical Characteristics........................................................................................................ 5
DC Characteristics ................................................................................................................................................. 5 LED Backlight Circuit Characteristics..................................................................................................................... 5 AC Characteristics ................................................................................................................................................. 6
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4.
4.1 4.2 4.3
Function Specifications .......................................................................................................... 7
Adjusting the Display Contrast ............................................................................................................................... 7 Display Pixel Map................................................................................................................................................... 7 Signal Sequence .................................................................................................................................................... 8
5.
Design and Handling Precaution ........................................................................................... 9
URL:
www.topwaydisplay.com www.topwaysz.com
Document Name: LM2028-Manual-Rev0.2.doc Page: 2 of 9
TOPWAY
1. Basic Specifications
1.1
LCD Module User Manual
LM2028
Power Supply Highlight - Logic Power Supply (VDD-VSS) - LCD Driver Supply (VDD-VEE) - LED Backlight Supply (BLA-BLK) - Interface
Note:
: 3.0 ~ 5.0 V : 25V : 300mA (3.55V TYP.) : 4bit controller interface
Please see the "3. Electrical Characteristics" for details.
Display Specifications 1) LCD Display Mode : STN, Negative, Transmissive 2) Display Color : Display Data = "1" : Light Gray (*1) www..com : Display Data = "0" : Deep Blue (*2) 3) Viewing Angle :6H 4) Driving Method : 1/240 duty, 1/17 bias 5) Backlight : White LED backlight
Note: *1. Color tone may slightly change by Temperature and Driving Condition. *2. The Color is defined as the inactive / background color
1.2
1.3
Mechanical Specifications 1) Outline Dimension : 166.0 x 109.0 x 12.2MAX see attached Outline Drawing for details Block Diagram
S6B2086X or equivalent Backlight Circuit S6B2086X or equivalent
1.4
COM1 : COM80
COM81 : COM160
320 x 240 pixels LCD Panel
S6B2086X or equivalent
BLA BLK
COM161 : COM240
FLM LP CP M /DISPOFF D0~D3 VDD VSS VEE V0
SEG81 : SEG160
SEG161 : SEG240
S6B2086X or equivalent
S6B2086X or equivalent
S6B2086X or equivalent
S6B2086X or equivalent
Power Circuit
URL:
www.topwaydisplay.com www.topwaysz.com
Document Name: LM2028-Manual-Rev0.2.doc Page: 3 of 9
SEG241 : SEG320
SEG1 : SEG80
TOPWAY
1.5 Terminal Functions Pin Pin I/O No. Name 1 FLM Input 2 LP Input 3 CP Input Input Input Power Power Power Input Input Input Input Input Power Power
LCD Module User Manual
LM2028
Descriptions First Line Marker Line Pulse signal, for latching the segment buffer to the segment driver Clock Pulse signal, for shifting the data (D0~D3) into the segment buffer Controlling signal for the LCD AC driving LCD contrast setting reference Positive Power Supply 0V Power Supply, Ground Negative Power Supply for Driving LCD Display Data Display Data Display Data Display Data Display ON/OFF control signal, /DISPOFF = 0, display off /DISPOFF = 1, display on No Connection, keep open LED Backlight Positive Supply LED Backlight Negative Supply
4 M 5 V0 6 VDD 7 VSS www..com 8 VEE 9 D0 10 D1 11 D2 12 D3 13 /DISPOFF 14 15 16 NC BLA BLK
URL:
www.topwaydisplay.com www.topwaysz.com
Document Name: LM2028-Manual-Rev0.2.doc Page: 4 of 9
TOPWAY
Items Supply Voltage Input Voltage LCD Driving Voltage Operating Temperature Storage Temperature Symbol VDD VIN VDD-VEE TOP TST
LCD Module User Manual
LM2028
2. Absolute Maximum Ratings
Min. -0.3 VSS-0.3 VSS 0 -20 Max. +6.0 VDD+0.3 30 50 70 Unit V V V C C Condition
VSS = 0V VSS = 0V VSS = 0V No Condensation No Condensation
Cautions: Any Stresses exceeding the Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
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3. Electrical Characteristics
3.1 DC Characteristics Symbol VDD VDD-VEE VIN VIN IDD MIN. 3.0 25 0.8xVDD 0 TYP. 3.5 MAX. 5.5 28 VDD 0.2x VDD 13.0 VSS=0V, VDD =5.0V, TOP =25C Unit Applicable Pin VDD V VEE V V V mA
D0~D3, CP, LP, FLM, M /DISPOFF D0~D3, CP, LP, FLM, M /DISPOFF VDD
Items Operating Voltage LCD Driving Voltage Input High Voltage Input Low Voltage Operating Current 3.2
LED Backlight Circuit Characteristics Symbol VfBLA IfBLA MIN. TYP. 3.55 MAX. 360 BLK=0V, IfBLA=300mA, TOP =25C Unit Applicable Pin BLA, BLK V BLA, BLK mA
Items Forward Voltage Forward Current
Cautions: Exceeding the recommended driving current could cause substantial damage to the backlight and shorten its lifetime.
BLA
BLK
No. of LED = 18pcs
URL:
www.topwaydisplay.com www.topwaysz.com
Document Name: LM2028-Manual-Rev0.2.doc Page: 5 of 9
TOPWAY
3.3 AC Characteristics
LCD Module User Manual
LM2028
Item Clock cycle time Clock pulse width Rise time Fall time Data set-up time Data hold time Clock set-up time Clock hold time /DISPOFF low pulse width www..com /DISPOFF clear time
Symbol tcy twck tr tf tds tdh tcs tch twdl tcd
MIN. 160 57 38 38 100 100 1500 125
TYP. -
VSS=0V, VDD=5.0V, TOP=25C MAX. Unit ns ns 24 ns 24 ns ns ns ns ns ns ns VSS=0V, VDD=3.3V, TOP=25C MAX. Unit ns ns 24 ns 24 ns ns ns ns ns ns ns
Item Clock cycle time Clock pulse width Rise time Fall time Data set-up time Data hold time Clock set-up time Clock hold time /DISPOFF low pulse width /DISPOFF clear time
Symbol tcy twck tr tf tds tdh tcs tch twdl tcd
MIN. 315 120 82 82 150 150 1500 125
TYP. -
Interface Timing Digram
URL:
www.topwaydisplay.com www.topwaysz.com
Document Name: LM2028-Manual-Rev0.2.doc Page: 6 of 9
TOPWAY
LCD Module User Manual
LM2028
4. Function Specifications
4.1 Adjusting the Display Contrast A Variable-Resistor must be connected to the LCD module for providing a reference to V0. Adjusting the VR will result the change of LCD display contrast. The recommended value of VR is 25k to 50k
LCD module VDD V0 VEE
www..comDisplay 4.2
1,1 (D3) 1,2 (D3) 1,3 (D3) : : : 1,238 (D3) 1,239 (D3) 1,240 (D3) 2,1 (D2) 2,2 (D2) 2,3 (D2) : : : 2,238 (D2) 2,239 (D2) 2,240 (D2)
Pixel Map
3,1 (D1) 3,2 (D1) 3,3 (D1) : : : 3,238 (D1) 3,239 (D1) 3,240 (D1) 4,1 (D0) 4,2 (D0) 4,3 (D0) : : : 4,238 (D0) 4,239 (D0) 4,240 (D0) 5,1 (D3) 5,2 (D3) 5,3 (D3) : : : 5,238 (D3) 5,239 (D3) 5,240 (D3) ------------316,1 (D0) 316,2 (D0) 316,3 (D0) : : : 316,238 (D0) 316,239 (D0) 316,240 (D0) 317,1 (D3) 317,2 (D3) 317,3 (D3) : : : 317,238 (D3) 317,239 (D3) 317,240 (D3) 318,1 (D2) 318,2 (D2) 318,3 (D2) : : : 318,238 (D2) 318,239 (D2) 318,240 (D2) 319,1 (D1) 319,2 (D1) 319,3 (D1) : : : 319,238 (D1) 319,239 (D1) 319,240 (D1) 320,1 (D0) 320,2 (D0) 320,3 (D0) : : : 320,238 (D0) 320,239 (D0) 320,240 (D0)
: : :
: : :
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Pixel mapping (Top View) Based on the top view of the LCD module, the 1, 1 (x, y) pixel is the upper-left pixel; the 320, 240 (x, y) pixel is the lower-right pixel. Each pixel is driven by D3, D2, D1, or D0, depends on column. The left most column, 1st column, is driven by D3, the 2nd column is driven by D2, and so on.
URL:
www.topwaydisplay.com www.topwaysz.com
Document Name: LM2028-Manual-Rev0.2.doc Page: 7 of 9
TOPWAY
4.3 Signal Sequence
LCD Module User Manual
LM2028
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In the upper section (expended view), shows the data sequence of lines. In the lower section (compressed view), shows the signal sequence of FLM, LP and M in frames.
URL:
www.topwaydisplay.com www.topwaysz.com
Document Name: LM2028-Manual-Rev0.2.doc Page: 8 of 9
TOPWAY
LCD Module User Manual
LM2028
5. Design and Handling Precaution
1. 2. 3. 4. 5. 6.
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7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.
The LCD panel is made by glass. Any mechanical shock (eg. dropping form high place) will damage the LCD module. Do not add excessive force on the surface of the display, which may cause the Display color change abnormally. The polarizer on the LCD is easily get scratched. If possible, do not remove the LCD protective film until the last step of installation. Never attempt to disassemble or rework the LCD module. Only Clean the LCD with Isopropyl Alcohol or Ethyl Alcohol. Other solvents (eg. water) may damage the LCD. When mounting the LCD module, make sure that it is free form twisting, warping and distortion. Ensure to provide enough space (with cushion) between case and LCD panel to prevent external force adding on it, or it may cause damage to the LCD or degrade the display result. Only hold the LCD module by its side. Never hold LCD module by add force on the heat seal or TAB. Never add force to component of the LCD module. It may cause invisible damage or degrade of the reliability. LCD module could be easily damaged by static electricity. Be careful to maintain an optimum anti-static work environment to protect the LCD module. When peeling off the protective film from LCD, static charge may cause abnormal display pattern. It is normal and will resume to normal in a short while. Take care and prevent get hurt by the LCD panel sharp edge. Never operate the LCD module exceed the absolute maximum ratings. Keep the signal line as short as possible to prevent noisy signal applying to LCD module. Never apply signal to the LCD module without power supply. IC chip (eg. TAB or COG) is sensitive to the light. Strong lighting environment could possibly cause malfunction. Light sealing structure casing is recommend. LCD module reliability may be reduced by temperature shock. When storing the LCD module, avoid exposure to the direct sunlight, high humidity, high temperature or low temperature. They may damage or degrade the LCD module
URL:
www.topwaydisplay.com www.topwaysz.com
Document Name: LM2028-Manual-Rev0.2.doc Page: 9 of 9

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