LCD Display TX07

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Introduction

The Hitachi TX07D09VM1CAB is a 2.27" QVGA display module with Touch screen. (http://www.hitachi-displays-eu.com/doc/TX07D09VM1CAB.pdf)

General description of the LCD board (http://fpga4u.epfl.ch/wiki/Video_extension_for_FPGA4U).

Specification

  • Resolution: 240x320
  • Number of Colors: 262,144 (3x6 bits, 18-bit RGB)
  • R, G, B pixels (0.057mm each x 0.171mm), vertical stripes
  • Transmissive color TFT
  • Backlight 5 LEDs
  • Touch screen

Interface

Schematic

Pin assignment

External Display Interface

16-bit or 18-bit RGB interface. The RGB data is synced with 3 signals: dotclk, hsync and vsync. This interface behaves very much like the standard VGA interface, the main difference being that this one is clocked. The signals have to change on the falling edge of the Dot Clock.

  • HSync : 2 DotClk, Low
  • Horizontal total: 270 DotClk
    • HBP: 12 (Start at same time as HSync going low) Horizontal Back Porch
    • Data H: 240 Visible Horizontal Dots
    • HFP: 18 (15..21) Horizontal Front Porch
  • VSync : 7 H Lines, Low
  • Horizontal total: 348 H Lines
    • VBP: 8 (Start at same time as HSync going low) Vertical Back Porch
    • Data V: 320 Lines Visible Lines
    • VFP: 20 (17..22) Vertical Front Porch

Connector to LCD

This is a 45 pins connector.

45 Pins LCD connector
Pin Num Name FPGA Pin Video extension board
1 Gnd Gnd
2 VCOM Common Electrode, Typ. 2.2V
3 Gnd
4 Mout Alternating signal for Vcom, Output, 4.7uF to VCOM
5 Gnd
6
7
8
9 V3.3 Vcc for Logic, Typ. 3V, 2.5V ~ 3.3V
10 LCD_DotClk PIN_H18 Dot Clock, 5.6 MHz, (5MHz ~6.5MHz)
11
12 Gnd
13 R[2] PIN_V22 R[0]
14 R[3] PIN_V20 R[1]
15 R[4] PIN_W22 R[2]
16 R[5] PIN_Y22 R[3]
17 R[6] PIN_Y20 R[4]
18 R[7] PIN_Y18 R[5]
19 G[2] PIN_M19 G[0]
20 G[3] PIN_N22 G[1]
21 G[4] PIN_N15 G[2]
22 G[5] PIN_P17 G[3]
23 G[6] PIN_R22 G[4]
24 G[7] PIN_R20 G[5]
25 B[2] PIN_F3 B[0]
26 B[3] PIN_G3 B[1]
27 B[4] PIN_G6 B[2]
28 B[5] PIN_H2 B[3]
29 B[6] PIN_H4 B[4]
30 B[7] PIN_H6 B[5]
31 Gnd
32 5V VDH, Power Supply for Vcom and source driver, 5.0V, 4.5V ~ 6.0V
33 LCD_HSync PIN_D19 HSync, 20,77 kHz
34 VGL VGL, Power Supply for Gate Driver Low, -15V , -16V ~ -14V
35
36 VGH VGH, Power Supply for Gate Driver high, 15V, 14V ~ 16V
37 LCD_VSync PIN_E21 VSync, 60Hz
38 Gnd
39 YU YU, Touch Upper Side
40 XR XR, Touch Right Side
41 Gnd YD, Touch Lower Side
42 Gnd XL, Touch Left Side
43 Gnd
44 VLed- Cathode Supply LED
45 VLed+ Anode Supply LED, (Vled+ -Vled-) = 5*3.2V = 16V .. 17.5V @25mA

Backlight

The backlight of the display module is made up of 5 white LEDs. In order to attain the required voltage (12.8V) to drive the LEDs, a LED driver is included on the board. (National Semiconductor LM2707)

A PWM can be connected to LED_ON to control the LED brighting.

Power control
Name FPGA Pin Video extension board
StepUp_ON PIN_C21 Power up the +5V needed by LCD, active High
LED_ON PIN_C19 Power up the LED, a PWM can be connected (until 50kHz) to control the light, active high
LCD_ON PIN_H16 Power up the LCD, active High

Touch screen

The touch screen can be controlled by a SPI A/D converter, ADC082S021. The access is done through 4 pins.

A/D control
Name FPGA Pin Video extension board
TS_CS_n PIN_J21 Select A/D converter (active low)
LCD_TS_SCL PIN_F20 SPI Clock
LCD_TS_SDO PIN_G17 SPI Serial Data Out (from A/D)
LCD_TS_SDI PIN_G21 SPI Serial Data in (to A/D)

The SPI pins are shared with LCD model TX06, thus not with the TX07 describe here.

Links

Retrieved from "https://fpga4u.epfl.ch/index.php?title=LCD_Display_TX07&oldid=3603"
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