Display Driver Gamma Curve Segmentation for Transmittance and Viewing Angle
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Solution Overview
Problem
High-resolution liquid crystal display panels face a trade-off between penetration transmittance and viewing angle, where improving one aspect compromises the other, leading to color cast and limited viewing angles in large-sized displays.
Innovation Solution
A method for driving a display apparatus involves splitting the gamma standard curve into two corresponding curves and using these to control the applied voltage, allowing for alternate processing of grayscale values to optimize both transmittance and viewing angle without sacrificing panel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional single gamma curve is used to optimize penetration transmittance, then transmittance is improved (5.1%), but viewing angle deteriorates (cannot meet 60 degrees requirement)
Solution Approach 1:
The patent divides the single gamma standard curve into two separate gamma grayscale value corresponding curves (first and second curves). Each curve is optimized for different grayscale ranges, allowing the system to segment the viewing angle optimization across different brightness levels. This segmentation enables simultaneous improvement of both transmittance and viewing angle by selecting appropriate curves for different grayscale values.
Solution Approach 2:
The patent implements dynamic switching between the first and second gamma curves based on grayscale value thresholds. The drive circuit dynamically selects which curve to apply depending on the current pixel grayscale value, creating a adaptive system that optimizes both transmittance and viewing angle in real-time based on the display content requirements.
2Adaptability or versatility
If a conventional single gamma curve is used to optimize viewing angle, then viewing angle is improved (meets 60 degrees requirement), but penetration transmittance deteriorates (3.7%)
Solution Approach 1:
The patent segments the grayscale range into different zones, each handled by a specialized gamma curve. The first gamma curve optimizes for certain grayscale ranges to improve viewing angle, while the second gamma curve optimizes for other ranges to maintain transmittance. This segmentation allows the system to achieve both viewing angle and transmittance requirements simultaneously.
Solution Approach 2:
The patent changes the gamma curve parameters (grayscale value mappings) based on the display requirements. By adjusting the grayscale value corresponding curves to have different characteristics in different ranges, the system can optimize transmittance and viewing angle parameters simultaneously through parameter variation rather than using a fixed single curve.
3Manufacturing precision
If high resolution is implemented in large-sized displays, then resolution is improved, but the trade-off between penetration transmittance and viewing angle becomes more severe
Solution Approach 1:
The patent applies segmentation to the gamma correction process specifically for high-resolution large-sized displays. By dividing the grayscale correction into multiple curves with different optimization focuses, the system can maintain the benefits of high resolution while resolving the transmittance-viewing angle trade-off that becomes more pronounced in large displays.
Solution Approach 2:
The patent adjusts gamma curve parameters to compensate for the reduced pixel density in large displays. By changing the grayscale value mappings and switching between different curve configurations, the system optimizes the balance between transmittance and viewing angle specifically tailored for high-resolution large-sized display characteristics.
Data Source
AI summary
This application relates to a method for driving a display apparatus, includes: outputting an output image corresponding to an pixel signal; performing a corresponding grayscale value conversion processing on a pixel grayscale value of the output image; and converting, according to a gamma correction curve, the pixel grayscale value of the output image after the corresponding grayscale value conversion processing into a corresponding applied voltage, and scanning and outputting the corresponding applied voltage to a display panel, wherein the corresponding grayscale value conversion processing splits a gamma standard curve into a first gamma grayscale value corresponding curve and a second gamma grayscale value corresponding curve, and outputs the two curves to the output image in an alternate manner, where the output image is processed by using a grayscale value corresponding curve.