Gamma Correction Voltage Generator for LCD Display
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Solution Overview
Problem
Conventional gamma correction schemes in LCDs face challenges in adapting to variations in image data and backlight brightness, leading to increased chip size and cost due to the need for numerous lookup tables and complex register management.
Innovation Solution
A method and device that generate gamma correction voltages based on a reference value, subdividing them into sub-gray-scale voltages corresponding to multiple gamma values, allowing for dynamic adjustment of gray-scale voltages without the need for extensive lookup tables or additional circuits, thereby reducing chip size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gamma correction schemes use multiple lookup tables to adapt to variations in image data and backlight brightness, then gamma correction precision is improved, but chip size and device complexity increase
Solution Approach 1:
The patent segments the gamma correction function by separating the generation of gamma correction voltages from the selection of specific voltage levels. A single lookup table generates base gamma correction voltages, which are then dynamically adjusted through selective combination and scaling operations, replacing the need for multiple lookup tables with a modular voltage generation architecture.
Solution Approach 2:
The patent creates a universal gamma correction voltage generator that can produce multiple gray-scale voltage levels corresponding to different gamma values through a single unified circuit architecture. This multi-functional generator uses selective voltage combination and scaling to serve multiple gamma correction purposes without requiring separate dedicated circuits for each gamma value.
2Adaptability or versatility
If conventional gamma correction schemes use numerous lookup tables to handle varying display conditions, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic adaptability by enabling real-time selection and combination of gamma correction voltages based on current display conditions such as image data characteristics and backlight brightness. The system dynamically adjusts which voltage levels are selected and how they are combined, allowing adaptation to varying conditions without requiring pre-configured registers for each scenario.
Solution Approach 2:
The patent changes the operational parameters of the gamma correction system by allowing dynamic modification of voltage selection and combination ratios based on display conditions. Instead of storing different gamma curves in separate lookup tables, the system achieves adaptability by changing how existing voltages are selected and combined, reducing register management complexity while maintaining versatility.
3Device complexity
If conventional gamma correction uses fixed gamma values in lookup tables, then device complexity is reduced, but ability to adapt to variations in image data and backlight brightness deteriorates
Solution Approach 1:
The patent performs preliminary generation of gamma correction voltages corresponding to a reference gamma value, storing these base voltages in a single lookup table. This preliminary action creates a foundation of pre-calculated voltages that can be efficiently selected and combined later, maintaining simple lookup table management while enabling subsequent dynamic adaptation through voltage selection and scaling operations.
Solution Approach 2:
The patent introduces an intermediary voltage selection and combination mechanism that sits between the fixed lookup table and the final gamma correction output. This intermediary layer dynamically selects and combines base gamma correction voltages to produce adjusted gray-scale voltages that adapt to varying image data and backlight conditions, bridging the gap between fixed storage and dynamic requirements.
Data Source
AI summary
A gamma correction device and method thereof is described herein, in which gray-scale voltages may be generated that correspond with a plurality of gamma values. The gray-scale voltages may be generated by adjusting output ranges of the gray-scale voltages while fixing a gamma correction voltage on a constant level. The gamma correction device may include a gamma correction voltage generator generating a plurality of gamma correction voltages corresponding to a reference gamma value; a gray-scale voltage generation circuit dividing the gamma correction voltages to generate a plurality of sub gray-scale voltage sets each of which includes a sub gray-scale voltage corresponding to each gamma value; and a gray-scale voltage selection circuit outputting one of the sub gray-scale voltages of each sub gray-scale voltage set as a gray-scale voltage.