Display Panel Driver Coefficient-Based Gamma Correction
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Solution Overview
Problem
Existing LCD devices for mobile terminals face challenges in achieving high display quality, particularly in contrast, due to low backlight brightness for power conservation, and require large memory and high power consumption for gamma correction using look-up tables.
Innovation Solution
A display device that uses an arithmetic expression to generate output gray-scale data from input gray-scale data, eliminating the need for look-up tables and reducing circuit size and power consumption by switching coefficients for correction operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a look-up table (LUT) is used for gamma correction, then display quality and contrast are improved, but circuit size increases due to high-capacity memory requirements
Solution Approach 1:
The patent changes the fundamental parameter of correction data representation from full LUT (26×8×3=1536 bits) to compressed coefficient sets. By representing gamma correction through mathematical parameters (coefficients) rather than complete lookup tables, the data size is dramatically reduced while maintaining correction functionality.
Solution Approach 2:
The patent extracts only the essential parameters needed for correction (coefficients of arithmetic expressions) from the complete LUT structure. By taking out only the necessary correction information rather than storing all possible input-output mappings, memory requirements are significantly reduced.
2Illumination intensity
If a look-up table (LUT) is used for gamma correction, then display quality is improved, but electric power consumption increases during LUT rewriting
Solution Approach 1:
By changing from LUT-based correction to coefficient-based arithmetic correction, the amount of data that needs to be transferred and processed during correction switching is dramatically reduced. This parameter change from storing complete mappings to storing compact mathematical representations directly reduces power consumption during correction operations.
Solution Approach 2:
The patent uses only the minimal necessary data (coefficients) to achieve gamma correction functionality, rather than transferring and processing complete LUT data. This partial action approach—using only the essential correction parameters—reduces the computational burden and power consumption during correction switching.
3Use of energy by moving object
If backlight brightness is reduced for power conservation, then electric power consumption is reduced, but contrast characteristics deteriorate
Solution Approach 1:
The patent applies gamma correction with adjustable coefficients to transform the relationship between input and output gray-scale data. By dynamically adjusting the correction parameters (gamma values), the system can enhance contrast characteristics even when backlight brightness is reduced, thus maintaining display quality while conserving power.
Solution Approach 2:
The patent performs gamma correction on the video signal before it reaches the display panel. This preliminary processing of the signal compensates for the reduced backlight brightness by pre-adjusting the gray-scale values, ensuring that contrast characteristics are maintained even at lower power consumption levels.
Data Source
AI summary
An LCD device according to the present invention has: an LCD panel; an operation and correction circuit configured to perform a correction operation with respect to an input gray-scale data of a target frame image by using an arithmetic expression to generate an output gray-scale data; a data line driver configured to drive the LCD panel in accordance with the output gray-scale data; and a correction data calculation circuit configured to generate a correction data that specifies a relationship between the input gray-scale data and the output gray-scale data of the target frame image, depending on the input gray-scale data of the target frame image or an input gray-scale data of a precedent frame image followed by the target frame image. The operation and correction circuit determines coefficients of the arithmetic expression from the correction data.