LVDS Interface Definition and Wiring Guide: Comprehensive Technical Manual for Industrial LCD Screens

LVDS (Low Voltage Differential Signaling) is one of the most common display interfaces in industrial LCD screens, widely used in:

Industrial displays
CNC machine tool control panels
Medical equipment
Vehicle terminals
Agricultural navigation equipment
Charging piles
Industrial HMIs

Compared to traditional TTL interfaces, LVDS has advantages such as strong anti-interference capabilities, long transmission distance, and low power consumption, making it the mainstream interface standard for industrial TFT LCDs.

What is an LVDS interface?

LVDS is a technology that uses differential transmission to transmit high-speed digital signals.

Key features

Low operating voltage (approximately ±350mV)
Low EMI radiation
Strong anti-interference capability
Supports high-speed data transmission
Suitable for long-distance connections

How LVDS Interface Works

LVDS uses a pair of positive and negative signal lines for transmission:

RX0- and RX0+

RX1- and RX1+

RX2- and RX2+

RXCLK- and RXCLK+

The receiver identifies the logic state by detecting the voltage difference between the two lines, thus it is insensitive to external noise.

Common LVDS types

Type	Number of Channels	Color Depth	Applicable Resolution
Single Channel 6-bit	4 differential lines	18-bit	1024×768
Single Channel 8-bit	4 differential lines	24-bit	1366×768
Dual Channel 8-bit	8 differential lines	24-bit	1920×1080 and above

LVDS Signal Components

A standard LVDS signal typically includes:

Data Channels

RX0±
RX1±
RX2±
RX3± (used for 8-bit)

Clock Channel

RXCLK±

Power Supply

VCC (3.3V / 5V / 12V)

Control Signals

ENAB / DISP
PWM
SDA / SCL (EDID or backlight control)

Common 30-pin LVDS pin definitions (example)

Pin	Signal	Description
1	VCC	3.3V
2	VCC	3.3V
3	GND	Ground
4	GND	Ground
5	RX0-	LVDS Data 0-
6	RX0+	LVDS Data 0+
7	GND	Ground
8	RX1-	LVDS Data 1-
9	RX1+	LVDS Data 1+
10	GND	Ground
11	RX2-	LVDS Data 2-
12	RX2+	LVDS Data 2+
13	GND	Ground
14	RXCLK-	Clock-
15	RXCLK+	Clock+
16	GND	Ground
17	RX3-	Data 3-
18	RX3+	Data 3+
19	GND	Ground
20	NC	No Connect
21	NC	No Connect
22	GND	Ground
23	SDA	I²C Data
24	SCL	I²C Clock
25	GND	Ground
26	PWM	Brightness Control
27	BL_EN	Backlight Enable
28	NC	No Connect
29	NC	No Connect
30	GND	Ground

Note: Pin definitions may vary between different brands and models. Please refer to the original manufacturer’s datasheet for the most accurate information.

40-Pin LVDS Interface Introduction

The 40-Pin LVDS interface is commonly used in LCD screens with independent backlight power supplies, typically adding:

LED+
LED-
PWM
BL_EN

Widely used in industrial displays such as 15.6″, 17.3″, and 21.5″ sizes.

LVDS Wiring Steps

Verify Specifications

Check the LCD screen’s: Pin Definition, Supply Voltage, Signal Mapping, Timing Parameters

Match Driver Board

Ensure the driver board supports: Resolution, Number of Channels, Color Depth, Voltage

Correctly Connect Backlight

Backlight circuitry includes: LED Power, BL_EN, PWM

Power-On Test

It is recommended to test with a current-limiting power supply first.

LVDS Interface Wiring Precautions

Differential wires must be wired in pairs.

Keep them of equal length.
Avoid running parallel to high-voltage lines.
Ensure proper grounding.
JEIDA/VESA definitions may differ between manufacturers.

Differences between JEIDA and VESA Mapping

LVDS data bit mapping has two standards: JEIDA and VESA.

Incorrect mapping settings may result in: color anomalies, image inversion, and grayscale errors.

Common Troubleshooting

Black Screen: Incorrect Power Supply (BL_EN Not Pulled High), Interface Definition Error
Screen Flickering: Resolution Incompatibility, JEIDA/VESA Incorrect Settings
Flickering: Unstable Timing, Excessive Cable Length
Backlight Not Working: Insufficient LED Power, PWM No Output

Typical Application Models

The following industrial LCD screens all use the LVDS interface:

BOE Technology Group BA104S01-300
AUO G150XNE-L03
Innolux G104XVN01
Tianma P1040XGF1MA00
Kyocera TCG104XGLPAPNN-AN40

FAQ

What are the differences between LVDS and TTL?

LVDS has stronger anti-interference capabilities and is suitable for high-speed and long-distance transmission; TTL is more suitable for low-speed, short-distance applications.

How far can LVDS transmit?

It is generally recommended to keep it within 1 meter; longer distances can be achieved when using high-quality screen cables.

Are LVDS and eDP compatible?

No, they are not compatible and require a dedicated conversion board.

How can I determine whether it is Single or Dual LVDS?

Check the Interface Type field in the datasheet.

What voltage is typically required for BL_EN?

Typically, it is 3.3V or 5V high level.

Conclusion

LVDS is one of the most commonly used display interfaces for industrial LCD screens. A correct understanding of pin definitions, data mapping, and backlight control methods is crucial for the stable operation of projects.

If you encounter problems during the selection or wiring process, we can provide:

Original LCD screens, datasheet analysis, interface definition confirmation, driver board matching, custom wiring harnesses, technical support, and sample services.

Please contact us at market@leehon.com for professional industrial display solutions.