LCD MODULE
General Specifications
| Feature | Specifications |
Display Spec. | LCD type | 2.1 inch |
| Resolution (H*V) | 480(RGB)×480 |
| Technology Type | a-Si TFT |
| Pixel Configuration | R.G.B. Vertical Stripe |
| Display Mode | Normally Black |
| Viewing Direction | ALL |
| Gray Scale Inversion Direction | - |
Mechanical Characteristics | OutlineDimensions (W x H x T) (mm) | 56.18*59.71*2.3 |
| Active Area(mm) | 53.28*53.28 |
| CTP View Area(mm) | / |
| With /Without Touch screen | Without |
| Connector Type | 0.5 PITCH 40PIN |
| Backlight Type | LED |
| Weight (g) | TBD |
Electrical Characteristics | Display Interface | 3SPI+18RGB |
| Number of color | 262K |
| Display Driver IC | ST7701S |
| Touch Driver IC | / |
Pin Assignment
| 1 | LED A | LED ANODE |
| 2 | LED K | LED CATHODE |
| 3 | LED K | LED CATHODE |
| 4 | GND | Ground |
| 5 | VCI | Power supply |
| 6 | RESET | Reset Signal ,Active Low |
| 7 | NC | NC |
| 8 | NC | NC |
| 9 | SDA | SPI Data signal |
| 10 | SCK | SPI Clock signal |
| 11 | CS | SPI Chip select signal |
| 12 | PCLK | RGB dot clock signal |
| 13 | DE | RGB data enable signal |
| 14 | VSYNC | RGB frame synchronizing signal |
| 15 | HSYNC | RGB line synchronizing signal |
| 16~33 | DB0~DB17 | RGB data signal(DB0:BlUE LSB;DB5:BIUE MSB;DB6:GREEN LSB;DB11:GREEN,MSB;DB12:RED LSB;DB17:RED MSB) |
| 34 | GND | Ground |
| 35 | TP_INT | Touch Interrupt |
| 36 | TP_SDA | Touch IIC Data signal |
| 37 | TP_SCL | Touch IIC Clock signal |
| 38 | TP_RESET | Touch Reset Signal |
| 39 | TP_VCI | Touch Power supply |
| 40 | GND | Ground |
Absolute Maximum Ratings
| Item | Symbol | Value | Unit |
| Power supply voltage for logic | VDD | 0.3~4.8 | V |
| Input voltage | Vin | VDD+0.3 | V |
| Operating temperature | Topr | -20 to 70 | °C |
| Storage temperature | Tstg | -30 to 80 | °C |
Note:
Note1: Absolute maximum rating is the limit value beyond which the
IC maybe broken.
They do not assure operations.
Note2: Background color changes slightly depending on ambient
temperature.
This Phenomenon is reversible.
Ta≦70℃: 75%RH max
Ta>70℃: absolute humidity must be lower than the humidity of
75%RH at 70℃
Note3: Ta at -30℃ will be <48hrs, at 80 ℃ will be <120hrs
Electrical Characteristics
1) Driving TFT LCD Panel
| Item | Symbol | Min | Type | Max | Unit | Test condition |
| Operating voltage | VDD | 2.5 | 2.8 | 4.8 | V | - |
| Supply current | IDD | - | - | 50 | mA | VDD=2.8V,Ta=25°C |
| Input voltage | VIH | 0.8VDD | - | VDD | V | - |
| VIL | 0 | - | 0.2VDD | V |
| Input leakage current | IIL | -1.0 | - | 1.0 | mA | VIN=VDD or VSS |
Note: Voltage greater than above may damage the module.
All voltages are specified relative to VSS=0V.
2) Driving Backlight
| Item | Symbol | Min | Typ | Max | Unit | Remark |
| Forward Current | IF | -- | 80 | 88 | mA | |
| Forward Voltage | VF | - | 3.2 | - | V |
| Connection mode | | -- | 4Parallel | -- | |
| LED number | / | | 4 | | pcs | |
Note1: Optical performance should be evaluated at Ta=25℃ only .If
LED is driven by high current, high ambient temperature & humidity
condition. The life time of LED will be reduced. Operating life
means brightness goes down to 50% initial brightness. Typical
operating life time is estimated data.
Optical Characteristics
| Item | Symbol | Condition | Min | Typ | Max | Unit | Remark |
View Angles | θT |
CR≧10 | - | 80 | - |
Degree |
Note 2 |
| θB | - | 80 | - |
| θL | - | 80 | - |
| θR | - | 80 | - |
| Contrast Ratio | CR | θ=0° | 700 | 900 | - | - | Note1 Note3 |
Response Time | TON |
25℃ |
- |
30 |
40 |
ms | Note1 Note4 |
| TOFF |
| Uniformity | U | - | 70 | 80 | - | % | Note1 Note6 |
| NTSC | - | - | - | 70 | - | % | Note 5 |
| Luminance | L | | 280 | 300 | - | cd/m2 | Note1 Note7 |
Test Conditions:
1. VF=3.2V, IF=80mA, the ambient temperature is 25℃.
2. The test systems refer to Note 1 and Note 2.
Note 1: Definition of optical measurement system.
The optical characteristics should be measured in dark room. After
5 minutes operation, the optical properties are measured at the
center point of the LCD screen. All input terminals LCD panel must
be ground when measuring the center area of the panel.
| Item | Photo detector | Field |
| Contrast Ratio |
SR-3A |
1° |
| Luminance |
| Chromaticity |
| Lum Uniformity |
| Response Time | BM-7A | 2° |
Note 2: Definition of viewing angle range and measurement system.
viewing angle is measured at the center point of the LCD by
CONOSCOPE(ergo-80).
Fig. 1 Definition of viewing angle
Note 3: Definition of contrast ratio
“White state “:The state is that the LCD should be driven by
Vwhite. “Black state”: The state is that the LCD should be driven
by Vblack. Vwhite: To be determined Vblack: To be determined.
Note 4: Definition of Response time
The response time is defined as the LCD optical switching time
interval between “White” state and “Black” state. Rise time (TON)
is the time between photo detector output intensity changed from
90% to 10%. And fall time (TOFF) is the time between photo detector
output intensity changed from 10% to 90%.
Note 5: Definition of color chromaticity (CIE1931)
Color coordinates measured at center point of LCD.
Note 6: Definition of Luminance Uniformity
Active area is divided into 9 measuring areas (Refer Fig. 2). Every
measuring point is placed at the center of each measuring area.
Luminance Uniformity (U) = Lmin/ Lmax
L-------Active area length W Active area width
Note 7: Definition of Luminance:
Measure the luminance of white state at center point.
Environmental / Reliability Test
| Item | Condition | Time (hrs) | Assessment |
| High temp. Storage | 80°C | 120 |
No abnormalities in functions and appearance |
| High temp. Operating | 70°C | 120 |
| Low temp. Storage | -30°C | 120 |
| Low temp. Operating | -20°C | 120 |
| Humidity | 40°C/ 90%RH | 120 |
| Thermal Shock(Non-operation) | -20°C ® 25°C ®70°C (0.5 hour ® 5 min ® 0.5 hour) |
10cycles |
Precautions For Use of LCD Modules
1 Handling Precautions
1.1.1 The display panel is made of glass. Do not subject it to a
mechanical shock by dropping it from a high place, etc.
1.1.2 If the display panel is damaged and the liquid crystal
substance inside it leaks out, be sure not to get any in your
mouth, if the substance comes into contact with your skin or
clothes, promptly wash it off using soap and water.
1.1.3 Do not apply excessive force to the display surface or the
adjoining areas since this may cause the color tone to vary.
1.1.4 The polarizer covering the display surface of the LCD module
is soft and easily scratched. Handle this polarizer carefully.
1.1.5 If the display surface is contaminated, breathe on the
surface and gently wipe it with a soft dry cloth. If still not
completely clear, moisten cloth with one of the following solvents:
－Isopropyl alcohol
－Ethyl alcohol
Solvents other than those mentioned above may damage the polarizer.
Especially, do not use the following:
－Water
－Ketone
－Aromatic solvents
1.1.6 Do not attempt to disassemble the LCD Module.
1.1.7 If the logic circuit power is off, do not apply the input
signals.
1.1.8 To prevent destruction of the elements by static electricity,
be careful to maintain an optimum work environment.
1.1.9 Be sure to ground the body when handling the LCD Modules.
1.1.10 Tools required for assembly, such as soldering irons, must
be properly ground.
1.1.11 To reduce the amount of static electricity generated, do not
conduct assembly and other work under dry conditions.
1.1.12 The LCD Module is coated with a film to protect the display
surface. Be care when peeling off this protective film since static
electricity may be generated.
1.1.13 Storage precautions
1.1.14 When storing the LCD modules, avoid exposure to direct
sunlight or to the light of fluorescent lamps.
1.1.15 The LCD modules should be stored under the storage
temperature range. If the LCD modules will be stored for a long
time, the recommend condition is:
1.1.16 The LCD modules should be stored in the room without acid,
alkali and harmful gas.
2 Transportation Precautions
The LCD modules should be no falling and violent shocking during
transportation, and also should avoid excessive press, water, damp
and sunshine.
