X-axis symmetric gamma inversion voltage generation
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Solution Overview
Problem
Existing display systems face challenges in generating gradation voltages that implement X-axis symmetric gamma inversion, which is essential for maintaining accurate gamma properties and preventing liquid crystal deterioration in LCD panels, while existing methods often require complex gamma correction and result in non-linear brightness outputs.
Innovation Solution
A method and apparatus that select maximum and minimum reference voltages from a voltage distribution to generate gradation voltages, using selectors and buffers to output these voltages based on an inversion control signal, allowing for the generation of gamma voltages that support X-axis symmetric gamma inversion by alternating the output between different voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex gamma correction is used to achieve accurate gamma properties, then gamma accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies inversion by swapping the roles of maximum and minimum reference voltages based on the inversion control signal. When inversion is enabled, the maximum reference voltage becomes the minimum and vice versa, allowing the system to achieve gamma inversion without complex correction circuits. This principle directly resolves the contradiction by simplifying the device while maintaining gamma accuracy through voltage polarity inversion.
Solution Approach 2:
The patent changes the voltage parameters dynamically by selecting different reference voltages (maximum or minimum) based on the inversion control signal. This parameter change approach allows the system to switch between normal and inverted gamma characteristics without adding complex correction logic, thereby maintaining gamma accuracy while reducing device complexity.
2Device complexity
If standard gradation voltage generation is used, then device simplicity is maintained, but X-axis symmetric gamma inversion cannot be achieved
Solution Approach 1:
The patent introduces dynamics by making the reference voltage selection changeable based on the inversion control signal. The first and second reference voltages are dynamically swapped when inversion is required, enabling the simple voltage generation circuit to adapt to different gamma inversion requirements. This dynamic approach maintains device simplicity while achieving the desired adaptability for X-axis symmetric gamma inversion.
Solution Approach 2:
The patent makes the voltage generation circuit universal by enabling it to perform both normal gradation voltage generation and X-axis symmetric gamma inversion using the same hardware structure. Through the inversion control signal, the circuit can switch between two modes, providing multi-functionality without increasing device complexity.
3Device complexity
If gamma inversion is not implemented, then device simplicity is maintained, but liquid crystal deterioration occurs
Solution Approach 1:
The patent implements periodic action by alternately inverting the gamma voltages through the inversion control signal. This periodic inversion prevents liquid crystal deterioration by regularly changing the voltage polarity, thereby extending liquid crystal lifespan without requiring complex additional protection circuits.
4Illumination intensity
If voltage levels are adjusted for linear brightness output, then brightness linearity is improved, but gamma correction complexity increases
Solution Approach 1:
The patent uses inversion to achieve brightness linearity by swapping reference voltages based on the inversion control signal. This approach maintains the voltage adjustment mechanism simple while achieving the desired brightness linearity through the inversion of gamma characteristics.
Data Source
AI summary
A method and apparatus for generating gradation voltages are provided. Maximum and minimum reference voltages are selected from a distribution of voltages ranging from a first source voltage to a second source voltage. The maximum reference voltage is selected as a 1st gradation voltage and the minimum reference voltage is selected as an Nth gradation voltage, or vice versa, in response to an inversion control signal, where N is a natural number. First to Mth gamma voltages are selected from among a plurality of voltages generated by a voltage distribution between the 1st gradation voltage and the Nth gradation voltage. Second to (N−1)th gradation voltages are generated from a voltage distribution between the 1st gradation voltage and the Nth gradation voltage, using the 1st gamma voltage to the Mth gamma voltage, where M is a natural number.