Pixel Driving Circuit Source Single-Driving Method
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Solution Overview
Problem
In large-size display devices with resolutions above 3840×2160, the design of four sub-pixels with different colors (RGBW) using a gate/source double-driving method results in excessive Gamma voltage supplies, leading to noise and increased costs, making it difficult to achieve a thin and compact design due to the high number of sub-pixel driving chips and pins required.
Innovation Solution
Implementing a source single-driving method where each sub-pixel driving chip is connected to two sub-pixels, reducing the number of Gamma voltage supplies and pins needed, and using a timing controller to coordinate driving voltages across sub-pixel driving chips, thereby decreasing noise and chip size while improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gate/source double-driving method is used for four sub-pixels with different colors, then the display device can achieve high resolution above 3840×2160, but the number of Gamma voltage supplies increases significantly, resulting in large amount of noise and decreased display quality
Solution Approach 1:
The patent divides the sub-pixels into two groups: first sub-pixels (including red and blue sub-pixels) and second sub-pixels (including green and white sub-pixels). Each group is driven by a separate sub-pixel driving chip, which reduces the number of Gamma voltage supplies needed per chip and thereby decreases noise.
Solution Approach 2:
The patent introduces a new dimension of classification by separating sub-pixels not just by color but by driving methodology (first sub-pixel driving vs. second sub-pixel driving). This dimensional change allows for optimized noise management through distributed Gamma voltage supplies.
2Measurement precision
If a gate/source double-driving method is used for four sub-pixels with different colors, then the display device can achieve high resolution above 3840×2160, but the number of sub-pixel driving chips and pins increases, making it difficult to achieve a thin and compact design
Solution Approach 1:
The patent segments the sub-pixel driving function into two separate driving chips: first sub-pixel driving chip for first sub-pixels, and second sub-pixel driving chip for second sub-pixels. This segmentation reduces the pin count per chip, enabling thinner and more compact display device designs while maintaining high resolution capability.
Solution Approach 2:
Each sub-pixel driving chip is designed to handle multiple sub-pixels of different colors within its group (e.g., first sub-pixel driving chip handles both red and blue sub-pixels). This multi-functionality reduces the total number of driving chips needed compared to having dedicated chips for each sub-pixel.
3Adaptability or versatility
If four sets of Gamma voltage supplies are provided for one pixel, then all four sub-pixels can be driven independently, but the number of pins occupied increases (36 pins when each set occupies 9 pins), increasing cost and complexity
Solution Approach 1:
The patent segments the Gamma voltage supply function by providing separate sets of Gamma voltage supplies for first sub-pixels and second sub-pixels through different driving chips. This segmentation reduces the pin count per chip while maintaining independent driving capability for all four sub-pixels.
Solution Approach 2:
The patent uses two separate sub-pixel driving chips that each handle a subset of sub-pixels, effectively creating a distributed copying of the driving function. This approach reduces the pin requirement per chip while maintaining the overall capability to independently drive all four sub-pixels.
Data Source
AI summary
The present invention provides a pixel driving circuit and a driving method thereof, and a display device. The pixel driving circuit is used for driving a pixel array, wherein each pixel in the pixel array comprises four sub-pixels with different colors, and wherein the pixel driving circuit comprises: at least one first sub-pixel driving chip and at least one second sub-pixel driving chip, wherein the at least one first sub-pixel driving chip each is connected to a part of sub-pixels corresponding thereto in corresponding pixels to drive them, and the at least one second sub-pixel driving chip each is connected to the other part of sub-pixels corresponding thereto in the corresponding pixels to drive them. In the invention, noise interference can be avoided, and the display quality is improved; the cost is reduced; signal transmitting efficiency is increased and the EMI characteristic of products is improved.