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SPEC TITLE EFFECTIVE DATE：2023.12.05
DOCUMENT CONTROL SPECIFICATION
Specifications
TFT-LCD module
Model No：QD3958
Customer name:
The project name:QD3958
For Customer’s Acceptance
Approved by Comment
Signature Date
Prepared by
Checked by
Approved by
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DOCUMENT CONTROL SPECIFICATION
Contents
1 General Description ...........................................................................................................3
1.1 Features .....................................................................................................................3
1.2 Application ................................................................................................................3
2 Outline Dimension ..............................................................................................................4
3 Electrical Characteristics ....................................................................................................5
3.1 TFT-LCD Module .....................................................................................................5
3.2 Back-Light Unit .........................................................................................................5
4 Block Diagram ....................................................................................................................6
5 TFT-LCM Interface Specification ......................................................................................7
6 Description of Interface’Signal ....................................................................................................... 8
6.1 RGB Interface Timing Characteristics ................................................................................. 8
6.2 DC Characteristics ........................................................................................................8
6.3 AC Characteristics .......................................................................................................9
6.4 Reset Characteristics ...................................................................................................9
7 Optical Specification .........................................................................................................10
8 Environment Absolute Maximum Ratings .......................................................................13
9 Inspection Standard ..........................................................................................................14
10 Package ............................................................................................................................15
11 Precautions .......................................................................................................................16
12.1 Handling ..................................................................................................................16
12.2 Storage .....................................................................................................................16
12.3 Operation .................................................................................................................17
12.4 Touch Panel Mounting Notes ..................................................................................17
12.5 Others ......................................................................................................................18
12 Records of Version ...........................................................................................................19
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DOCUMENT CONTROL SPECIFICATION
1 General Description
QD3958 is a transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor
liquid crystal display) module, which is composed of a TFT-LCD panel, a driver circuit a
backlight unit, The panel size is 3.95inch and thresolution is 320x480. High image quality a-
Si TFT LCD module. Partial-screen display function is available. Sleep and Stand-by modes
are available for power saving.
1.1 Features
No Item Specification Remark
1 Display Mode Normally Black
2 Screen Size 3.95inch (diagonal)
3 Resolution 320XRGBX480
4 Color Number 16.7M
5 Color Arrangement RGB-stripe
6 Driver IC ST7796S
7 Back Light White LED*8
8 Viewing Direction 12 O'CLOCK
9 Interface SPI_RGB 兼容
10 Surface Treatment UV Cut
1.2 Application
Mobile phone.
Portable multimedia device.
2 Outline Dimension
The mechanical detail is shown in Fig. 1 and summarized in Table 1 below.
Parameter Specifications Unit
Outline dimensions 60.88 (W) x94.57(H) x2.5+-0.1(D) (LCM,no include FPC) mm
Active area 55.68(W) x83.52(H) mm
Resolution 320(H)RGBx 480(V) dots -
Dot size 0.174(H) ×0.174 mm
Module brightness 300 cd/㎡
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Figure 1: Module specification of the module
银浆内框
不包含背胶厚度
REV：A
Doc.No.:
YU
易撕贴
3.95"
320(RGB)*480
银浆内框
12 O'CLOCK
XL XR
深圳市全动电子技术有限公司
双面胶 T=0.05MM
YD
LEDK
LEDK
LEDK
双面胶 T=0.05MM
弯折示意 LEDK
LEDK
图 LEDK
展开出货
DOCUMENT CONTROL SPECIFICATION
NOTES: K
K
1.DISPLAY TYPE: 3.95"TFT A
K
K
K
2.VIEWING DIRECTION: 12 O'CLOCK K
K
K
3.LCD DRIVE IC: IVO+ST7796S 背光电路图
4.POLARIZER MODE: TRANSMISSIVE/POSITIVE
5.OPERATING TEMP: -10°C~+60°C 2023.12.05
6.STORAGE TEMP: -20°C~+70°C 深圳市全动电子技术有限公司
SPEC TITLE 7.UNMARKER TOLERANCE: ±0.20
LCM OUTLINE REV. UNIT SIZE
8.REQUIREMENTS ON ENVIRONMENTAL PROTECTION: RoHS (3)
QD3958 mm
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3 Electrical Characteristics
3.1 TFT-LCD Module
Ta=25℃
Value
Item Symbo Unit Notes
Min Typ Max
Vcc 2.5 2.8 3.3
Supply Voltage for logic V
Vci 2.5 2.8 3.3
TFT Gate ON Voltage VGH * 11.5 19 V
TFT Gate OFF Voltage VGL -15.5 -7 V
Operating temperature Top -20 +70 ℃
Storage temperature Tst -30 +80 ℃
3.2 Back-Light Unit
Item Symbol Min. Typ. Max. Unit Remark
Current IF -- 120 160 mA
Forward
VF 3.0 3.2 3.4 V
voltage IF=160mA
X 0.240 0.28 VF=3.2V
Chroma
Y 0.250 0.29
Brightness L 4500 Cd/m2
Uniformity UBL 80 %
8 LED
The luminous intensity of LED is strongly dependent on the driving current.
It is recommended the input of backlight to be constant current rather than
constant voltage.
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4 Block Diagram
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5 TFT-LCM Interface Specification
Pin No. Symbol Functional I/O
1 YU Y+ I
2 XL X- I
3 YD X- I
4 XR X+ I
5 VCC Power supply input for LCM:2.8V Power supply
6 IOVCC Power supply input for LCM: 1.8V/2.8V Power supply
7 TE Serve as a TE (Tearing Effect) output signal I
8 CS Chip select input pin. O
The SPI interface (DCX): The signal for command or
9 RS/A0 ---RS=’H ’: Display data. I
---RS=’L ’: Instruction data.
A write strobe signal can be input via this pin and initiallizes a write
10 WR/SCL Serial clock input for SPI interface I
operation when the signal is low.
11 RD A read strobe signal can be input via this pin and initiallizes a read I
12 SDI Serial data input/output bidirectional pin for SPI Interface I/O
13 SDO Serial data output pin used for the SPI Interface O
14 GND Power Ground Power supply
15~32 DB0~DB17 Data interface I/O
33 GND Power Ground Power supply
34 DEN Data enable signal I
35 PCLK Dot clock signal for RGB interface operation I
36 HSYNC Horizontal sync I
37 VSYNC Vertical sync I
38 RESET Reset signal input Pin I
The System interface mode select
IM2~IM0=011,MCU8 BIT DB0~DB7
39~41 IM2-IM0 IM2~IM0=010,MCU16 BIT DB0~DB15 I
IM2~IM0=111,4-line 8bit serial
IM2~IM0=101,3-line 9bit serial
42 LEDA Power supply for backlight anode input terminal. BL Power
Power supply for backlight cathode input terminal. supply
BL Power
43~48 LED-K
supply
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6 Description of Interface’Signal
6.2 RGB Interface Timing Charateristics
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6.3 Reset Timing
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7. Optical Specification
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Note 1: The brightness test equipment setup
IB=60mA, Field=2° (As measuring “black” image, field=2° is the best testing condition.)
Note 2: Definition of contrast ratio (C.R)
Brightness When LCD is at “White” State
C.R =
Brightness When LCD is at “Black” State
Note 3: Definition of response
time
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Note 4: Definition of viewing angle
Note 5: Definition of uniformity (Un)
1/6 1/2 5/6
1/6
Active Area
1/2
5/6
Active Area
Bmin
Un = ×100%
Bmax
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8 Environment Absolute Maximum Ratings
Item Symbol Min Max Unit Remark
Operation temperature range Top -10 60 ℃ Ambient
Storage temperature range Tst -20 70 ℃ Ambient
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9
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10 Package
1 4
10 pcs per tray + 1 cover (EPE) Packing bag
2 5
Putting bag into carton
15 trays + 1 dummy tray = 150 ps Protected by 2 pieces of cushion EPE sheet
3 6
Putting trays into anti-electrostatic bag Packing carton with sealing tape
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Carton outline size: 400×295×145 (mm)
11 Precautions
Please pay attentions to the followings as using the LCD module.
11.1Handling
(a) Do not apply strong mechanical stress like drop, shock or any force to LCD
module. It may cause improper operation, even damage.
(b) Because the polarizer is very fragile and easy to be damaged, do not hit, press or
rub the display surface with hard materials.
(c) Do not put heavy or hard material on the display surface, and do not stack LCD
modules.
(d) If the display surface is dirty, please wipe the surface softly with cotton swab or
clean cloth.
(e) Avoid using Ketone type materials (e.g. Acetone), Toluene, Ethyl acid or Methyl
chloride to clean the display surface. It might damage the touch panel surface
permanently. The recommended solvents are water and Isopropyl alcohol.
(f) Wipe off water droplets or oil immediately.
(g) Protect the LCD module from ESD. It will damage the LSI and the electronic
circuit.
(h) Do not touch the output pins directly with bare hands.
(i) Do not disassemble the LCD module.
(j) Do not lift the FPC of Touch Panel.
11.2Storage
(a) Do not leave the LCD modules in high temperature, especially in high humidity
for a long time.
(b) Do not expose the LCD modules to sunlight directly.
(c) The liquid crystal is deteriorated by ultraviolet. Do not leave it in strong
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ultraviolet ray for a long time.
(d) Avoid condensation of water. It may cause improper operation.
(e) Please stack only up to the number stated on carton box for storage and
transportation. Excessive weight will cause deformation and damage of carton
box.
11.3Operation
(a) When mounting or dismounting the LCD modules, turn the power off.
(b) Protect the LCD modules from electric shock.
(c) The Driver IC control algorithms stated above should always obeyed to avoid
damaging the LSI and electronic circuit.
(d) Be careful to avoid mixing up the polarity of power supply for backlight.
(e) Absolute maximum rating specified above has to be always kept in any case.
Exceeding it may cause non-recoverable damage of electronic components or,
nevertheless, burning.
(f) When a static image is displayed for a long time, remnant image is likely to occur.
(g) Be sure to avoid bending the FPC to an acute shape, it might break FPC.
(h) Most of the touch screens have air vent to equalize the inside air pressure to the
outside one. The air vent must be open and liquid contact must be avoided as the
liquid may be absorbed if the liquid is accumulated near the air vent.
(i) For the fragility of ITO film, it should avoid to use too tapering pen as the input
material.
11.4Touch Panel Mounting Notes
(a) If a cushion is used between bezel/housing and film must be choose as free as
enough to absorb the expansion and contraction to avoid the distortion of film.
(b) The cushion must be placed out of the Viewing Area.
(c) Bezel/Housing edge must be posited between Key Area and Viewing Area. The
edge enters the Key Area may cause unexpected input if the gap is too narrow or
foreign particles like dusts exist between Bezel/Housing and ITO film.
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(d) Mounting example:
(Recommend)
0.2 ~ 0.5mm
Bezel / Housing
Cushion
ITO Film
ITO Glass
TP Active Area
TP Viewing Area
0.5 mm
The corner part has conductivity. Do not touch any metal part after mounting.
11.5 Others
a) If the liquid crystal leaks from the panel, it should be kept away from the eyes or
mouth.
b) For the fragility of polarizer, it is recommended to attach a transparent protective
plate over the display surface.
c) It is recommended to peel off the protection film on the polarizer slowly so that
the electrostatic charge can be minimized.
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12 Records of Version
Version Revise Date Page Content
A 2023.12.05 All New released
