Display Panel Viewing Angle Compensation via Overdrive Tables
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Solution Overview
Problem
High-resolution display panels face reduced transmittance and deteriorated viewing angles due to the 4-domain pixel structure, leading to granular sensations and vertical bright and dark stripes when viewed from the side, caused by inconsistent liquid crystal response times and gamma curves between front and side views.
Innovation Solution
An overdrive method employing multiple sets of overdrive tables to rapidly adjust grayscale values, ensuring target voltages are reached quickly, thereby improving brightness uniformity and eliminating vertical bright and dark band stripes by alternating pixel polarities and grayscale values between frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If viewing angle compensation is applied to improve side view characteristics, then color drift is reduced, but granular sensation and vertical bright and dark stripes appear
Solution Approach 1:
The patent applies different grayscale compensation strategies to different pixel types (first-type and second-type pixel units) based on their specific characteristics. Each pixel type undergoes independent grayscale transformation with its own overdrive table, allowing localized optimization that reduces vertical stripes while maintaining color accuracy in side views.
Solution Approach 2:
The patent dynamically adjusts grayscale values frame by frame using overdrive tables that map input grayscale values to compensated output values. The compensation amount varies depending on the current grayscale value and the specific pixel type, creating a dynamic adaptation mechanism that eliminates granular sensation while preserving color fidelity.
2Loss of energy
If 4-domain pixel structure is used in high resolution panels, then transmittance is maintained, but viewing angle characteristics deteriorate
Solution Approach 1:
The patent changes the grayscale parameter values dynamically based on the pixel type and frame number. By applying different grayscale transformations to first-type and second-type pixel units alternately, the system compensates for the viewing angle deterioration inherent in 4-domain structures while maintaining high transmittance characteristics.
Solution Approach 2:
The patent implements periodic alternation between different grayscale compensation schemes for first-type and second-type pixel units across successive frames. This periodic action ensures that both pixel types receive appropriate compensation over time, improving overall viewing angle uniformity without sacrificing the transmittance benefits of the 4-domain structure.
3Object-affected harmful factors
If grayscale values are alternated between first-type and second-type pixel units, then vertical stripes are eliminated, but response time requirements increase
Solution Approach 1:
The patent pre-calculates and stores overdrive tables that contain the optimal grayscale compensation values for different input grayscale levels and pixel types. This preliminary preparation allows the system to apply the correct compensation values immediately without real-time calculation delays, meeting the increased response time requirements while eliminating vertical stripes.
Solution Approach 2:
The patent uses overdrive techniques to rush the liquid crystal response by applying higher voltage initially to accelerate the transition, then reducing it to reach the target grayscale value. This skipping approach allows the system to meet tighter response time requirements caused by the alternating grayscale scheme for different pixel types.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method ensures timely achievement of preset grayscale values, enhancing brightness uniformity and eliminating vertical bright and dark band stripes, thus improving the viewing angle characteristics of high-resolution display panels.
Implementation Method 1
a liquid crystal reaction will correspond to grayscale values switching between different polarities
Implementation Method 2
The liquid crystal layer is configured with a liquid crystal alignment direction that is parallel to the substrate and perpendicular to the transistor groove
Data Source
AI summary
A viewing angle compensation method of a display panel and a display panel are provided. The method includes a step of providing a display panel, a step of setting data polarities, a step of performing grayscale transformation on grayscale values of successive frames, and a step of acquiring grayscale values of successive frames.