Display Panel Driving Method for RGBW Color Coordinate Correction
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Solution Overview
Problem
Conventional display panel driving methods result in uniform charging times for all sub-pixels, leading to color coordinate differences and reduced luminance in RGBW-type displays due to varying color coordinates of red, green, blue, and white sub-pixels.
Innovation Solution
Generating multiplexed load signals with varying low periods for different sub-pixels, such as red, green, blue, and white, to synchronize data voltages, allowing for distinct charging times that reduce the color coordinate difference without significant luminance loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform load signals are used for all data lines, then the charging time of data voltages is the same for all sub-pixels, but color coordinate differences occur and luminance is reduced in RGBW-type displays
Solution Approach 1:
The patent divides the uniform load signal into multiple segmented load signals, each corresponding to different data lines. Specifically, first load signals are applied to first and third data lines, while second load signals are applied to second and fourth data lines. This segmentation allows different charging times for different sub-pixel groups, resolving the color coordinate differences and luminance reduction issues in RGBW displays.
Solution Approach 2:
The patent applies different load signal characteristics to different data lines based on their specific requirements. The first load signals have different timing parameters than the second load signals, creating local quality variations that optimize the charging performance for specific sub-pixel types (RGB vs. W), thereby improving overall display quality and luminance.
2Manufacturing precision
If the charging time of white sub-pixel is increased, then color coordinate difference is reduced, but overall panel luminance decreases
Solution Approach 1:
The patent dynamically adjusts the charging time for white sub-pixels by using distinct load signals with optimized timing parameters. The second load signals applied to the fourth data line (connected to white sub-pixels) have specific timing characteristics that provide adequate charging time for color accuracy while preventing excessive charging time that would reduce overall panel luminance.
Solution Approach 2:
The patent changes the timing parameters of load signals to optimize performance. By adjusting the duration and timing of the second load signals relative to the first load signals, the system achieves optimal charging time for white sub-pixels that balances color coordinate accuracy with maintained panel luminance.
3Manufacturing precision
If multiplexed load signals with different timings are used, then color coordinate differences are minimized, but signal complexity increases
Solution Approach 1:
The patent uses a unified load signal generation approach where a single control logic generates multiple types of load signals (first and second load signals) with different timing characteristics. This multi-functional signal generator reduces complexity compared to having separate signal generation circuits for each data line, while still achieving color coordinate uniformity through the differentiated timing.
Data Source
AI summary
A method of driving a display panel includes steps of generating a plurality of load signals, of which at least one load signal has a different timing from the rest of the load signals, generating data voltages synchronized to low periods of the load signals and outputting the data voltages to data lines. Accordingly, the data voltages synchronized to each of the load signals can be outputted to each of the data lines. A color coordinate problem occurring when applying a RGBW type may be solved by setting a charging time of a white sub-pixel different from the rest of the sub-pixels. Thus, display quality of a display apparatus including the display panel may be improved.