Display Panel Color Compensation Using Dual Gamma Curves
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies, such as VA and PVA modes, suffer from narrow viewing angles and image quality issues due to uniform color compensation across sub-pixels, leading to a yellowish appearance when viewed from the side.
Innovation Solution
A display apparatus and method that employs a timing controller and data driver with compensation units to generate and apply different color compensation data to sub-pixels using distinct gamma curves, ensuring accurate color representation across multiple domains by converting grayscale data into analog signals for each sub-pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lookup table with uniform color compensation data is applied to all sub-pixels in SPVA mode LCD, then the device complexity is reduced and manufacturing costs are lowered, but image quality deteriorates with a yellowish appearance when viewed from the side
Solution Approach 1:
The patent divides the color compensation system into multiple segments: first compensation data generated from a first gamma curve and second compensation data generated from a second gamma curve. These separate compensation data sets are applied to different sub-pixels (first sub-pixel and second sub-pixel) within the same pixel, enabling domain-specific color compensation that eliminates the yellowish appearance while maintaining manageable system complexity
Solution Approach 2:
The patent implements local quality by applying different color compensation characteristics to different spatial locations. Specifically, first compensation data with first color characteristics is applied to first sub-pixels, while second compensation data with second color characteristics is applied to second sub-pixels. This local differentiation ensures accurate color representation across various viewing angles without requiring a single complex compensation scheme
2Manufacturing precision
If different gamma curves are applied to different sub-pixels to improve viewing angle and color accuracy, then image quality is improved, but storage capacity requirements increase
Solution Approach 1:
The patent employs preliminary action by pre-calculating and storing only the essential compensation data in lookup tables. The first compensation data is generated from a first gamma curve and the second compensation data from a second gamma curve, with both sets being pre-processed and stored for rapid retrieval during operation. This approach enables different gamma curves to be applied to different sub-pixels without proportionally increasing storage requirements, as the compensation data is prepared in advance rather than computed in real-time
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
This approach enhances image quality by preventing the yellowish phenomenon and reducing storage capacity requirements, thereby decreasing manufacturing costs and improving color accuracy across various viewing angles.
Implementation Method 1
When an electric field is applied to the liquid crystal layer, the LCD displays an image
Implementation Method 2
A liquid crystal display ("LCD") apparatus includes two opposite substrates and a liquid crystal layer interposed between the two opposite substrates
Implementation Method 3
Liquid cyrsal molecules in the liquid crystal layer are aligned so that their major axes are perpendicularly orientated to the lower substrate and the upper substrate
Implementation Method 4
a liquid crystal layer, which includes negative dielectric anisotropy
Data Source
AI summary
A display apparatus includes a display panel, a timing controller and a data driver. The display panel includes a plurality of unit pixels respectively including a first sub-pixel and a second sub-pixel. The timing controller includes a first compensation unit which receives grayscale data corresponding to the unit pixels and generates first compensation data of the grayscale data using offset values of first sample compensation data sampled from a first gamma curve. The data driver includes a second compensation unit which generates second compensation data of the grayscale data using second sample compensation data sampled from a second gamma curve and the first compensation data. Accordingly, the first and second compensation data comprise color compensation data, which improve image quality. A method for driving the display panel of the display apparatus is also provided.