LCD Timing Controller Serial Interface Reduces PCB Trace Count
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Solution Overview
Problem
Current signal transmission methods between a timing controller and source driver in LCD panels face challenges in reducing power consumption, meeting low operating voltage requirements, and simplifying panel layout, leading to high manufacturing costs and electromagnetic interference.
Innovation Solution
A timing controller that converts control signals and pixel data into serial signals, allowing for communication with source driver chips using only three data lines, a system clock, and a mode control signal, thereby simplifying the PCB layout and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If parallel data transmission is used between timing controller and source driver chips, then data transmission speed is improved, but the number of signal lines increases and layout complexity increases
Solution Approach 1:
The patent segments the data transmission process by dividing parallel data into multiple serial channels that are transmitted sequentially through a single data line. The timing controller divides the pixel data into groups corresponding to different source driver chips, transmits them through separate serial paths, and the source drivers reassemble the data in parallel format for display output.
Solution Approach 2:
The patent introduces a serial data transmission interface as an intermediary between the timing controller and source driver chips. This intermediary converts parallel data from the timing controller into serial format for transmission through minimal signal lines, then converts it back to parallel format at the source driver side, effectively mediating between high-speed parallel processing and low-complexity serial transmission.
2Object-affected harmful factors
If RSDS architecture is used for differential transmission, then electromagnetic interference is suppressed, but operating voltage requirement becomes difficult to meet and power consumption increases
Solution Approach 1:
The patent replaces the RSDS differential transmission mechanism with a simpler serial transmission system that uses minimal signal lines. By eliminating the need for complex differential pairs and current-mode logic, the design achieves acceptable EMI suppression through reduced signal line count and lower operating voltages, while significantly reducing power consumption associated with maintaining low-voltage differential signaling.
3Reliability
If twenty-three signal lines are used for connection between timing controller and source driver chips, then complete control and data transmission is achieved, but manufacturing cost increases and power consumption increases
Solution Approach 1:
The patent merges multiple signal lines into a single serial data transmission path. Instead of using separate lines for each data bit and control signal, the design combines all data transmission functions into a single serial interface that carries pixel data sequentially. This merging reduces the number of physical connections from twenty-three lines to just a few signal lines, simplifying PCB layout and reducing manufacturing costs while maintaining complete control and data transmission capability.
Data Source
AI summary
A timing controller for an LCD panel includes a signal receiver, a data reader, a signal receiver, a logic control unit, and a data conversion unit. The signal receiver receives transmitted signals, and the data reader acquires data from the signal receiver. The logic control unit receives the data acquired by the data reader to generate pixel data, and the data conversion unit receives the pixel data and converts them into serial signals. The timing controller converts the pixel data and the control commands into serial signals, and then they are transmitted in serial to each of the source driver chips.