Timing Controller WRGB Data Conversion for Display Drivers
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Solution Overview
Problem
LCD devices with WRGB pixel structures face challenges in data transfer due to exceeding the maximum data transfer rate between the EPI transmitter and the source driver IC, leading to manufacturing costs increases and data jitter issues, as the data formats for RGB and WRGB data differ, making it difficult to apply the same timing controller and source driver IC for both types.
Innovation Solution
A timing controller that converts input RGB data into WRGB data by generating conversion WRGB data with reduced bits and adding dummy bits, allowing for the same format transfer to the source driver IC, thereby reducing data transfer rates and enabling the use of a single source driver IC for both RGB and WRGB data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If WRGB data is transferred using the EPI interface with 40-bit parallel data, then the luminance of the LCD device is enhanced, but the data transfer rate exceeds the maximum capability of the source driver IC
Solution Approach 1:
The 40-bit WRGB parallel data is segmented into multiple smaller data units for transmission. The data aligner divides the wide parallel data into narrower serial streams that can be transmitted at rates compatible with the source driver IC's maximum capability, while still conveying all necessary color information (W, R, G, B channels).
Solution Approach 2:
The patent changes the data format parameters by converting from 40-bit parallel WRGB data to a reduced-bit serial format. This parameter transformation maintains the essential color information while reducing the transmission rate to fit within the source driver IC's capabilities, effectively resolving the bandwidth mismatch.
2Adaptability or versatility
If different data formats are used for RGB and WRGB data, then the panel can support both pixel structures, but the timing controller and source driver IC cannot be universally applied
Solution Approach 1:
The patent implements a universal data transmission interface that can handle both RGB and WRGB pixel structures. By using a standardized alignment and conversion process in the data aligner, the same timing controller and source driver IC can serve panels with different pixel structures, eliminating the need for separate hardware configurations.
Solution Approach 2:
The data aligner acts as an intermediary component that mediates between the input data (RGB or WRGB) and the source driver IC. It performs the necessary format conversion and alignment, allowing seamless compatibility between different data formats and the fixed interface of the source driver IC.
3Speed
If high-speed data transmission is used to transfer WRGB data, then the data can be transmitted faster, but data jitter occurs
Solution Approach 1:
The patent employs dynamic data alignment and timing adjustment mechanisms. The data aligner dynamically adapts the data transmission rate and timing based on the input data type (RGB or WRGB), ensuring stable transmission without jitter while maintaining optimal speed. This dynamic adjustment prevents the data integrity issues that occur with fixed high-speed transmission.
Data Source
AI summary
Discussed is a timing controller. The timing controller includes a receiver, a converter, an aligner, and an EPI transmitter. The receiver receives input RGB data from an external system. The converter converts the input RGB data into input WRGB data. The aligner converts one of W, R, G, and B data, composing the input WRGB data, into 0 to generate conversion WRGB data having bits less than the total number of bits composing the W, R, G, and B data. The EPI transmitter generates WRGB data by adding dummy bits to the conversion WRGB data, and outputs the WRGB data to a source driver IC.