LVDS vs V-by-One: Two Generations of LCD Panel Signal Transmission

In LCM (LCM) pattern and aging testing, the interface type between the signal source and the panel directly determines which test signal source to choose. The two most mainstream panel interfaces in the industry today are LVDS and V-by-One, which often confuse engineers new to display testing. This article sorts out their core differences, from principle to application.

1. What Is LVDS

LVDS (Low-Voltage Differential Signaling) is a general-purpose high-speed transmission technology from the 1990s. In LCD displays, LVDS transmits pixel data over multiple differential pairs: a typical 8-bit panel uses 4 data pairs plus 1 clock pair (4C1D), while a 10-bit panel uses 5 data pairs plus 1 clock pair.

• Data rate: a single differential pair typically runs within about 945Mbps, so overall bandwidth is limited;
• Resolution: common on small and mid-size panels at 1920×1080 and below;
• Features: mature technology, low cost and good compatibility — a common choice for industrial displays, automotive displays and small/mid-size modules.

2. What Is V-by-One

V-by-One is a high-speed serial interface standard for display panels developed by THine of Japan; its evolution, V-by-One HS, has become the de facto standard for large-size high-resolution TV panels. Unlike LVDS, V-by-One uses embedded clocking and no longer transmits a separate clock signal.

• Data rate: V-by-One HS reaches 4Gbps per lane, with 8-lane and 16-lane combinations supporting very high bandwidth;
• Resolution: easily supporting 4K and 8K ultra-HD panels;
• Features: fewer wire pairs, strong noise immunity and long-distance support — the mainstream interface for large TV panels (e.g. 55-inch+ 4K/8K).

3. Core Differences Compared

4. What It Means for Pattern Testing

A test signal source must output signals that exactly match the panel interface. When a production line handles both LVDS and V-by-One panels, buying a separate signal source for each type is costly and makes line changes troublesome. Yuanwei Technology’s LCM signal source products (such as the SVG-2401 and 209-VL) offer both LVDS and V-by-One outputs in one device — covering pattern, aging and image-quality testing for both panel types, with 8K ultra-HD output, significantly reducing test costs.