Gamma Voltage Controller for LCD Panel Adaptability
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Solution Overview
Problem
Conventional liquid crystal display (LCD) gradation voltage generators cannot finely adjust differences among data voltages to satisfy various gamma characteristics of LCD panels, limiting their performance.
Innovation Solution
A gamma voltage controller that includes a gamma distribution unit, gamma selection unit, gamma buffer unit, and gradation distribution unit, allowing for the definition of a gamma curve and adjustment of inflection points, enabling the output of a wide range of voltages by performing voltage divisions and buffering processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional gradation voltage generators are used, then the device structure is simple, but the ability to finely adjust data voltage differences and satisfy various gamma characteristics is insufficient
Solution Approach 1:
The gamma voltage controller is divided into four functional units: gamma distribution unit, gamma selection unit, gamma buffer unit, and gradation distribution unit. Each unit performs a specific function in the voltage generation and adjustment process, enabling precise control of gamma characteristics while maintaining modular simplicity
Solution Approach 2:
The gamma buffer unit includes adjustable inflection point adjustment buffers that can dynamically modify the gamma curve characteristics. This allows the system to adapt to different display panel requirements and achieve precise voltage adjustments for various gamma characteristics
2Adaptability or versatility
If the gamma curve is fixed, then the device structure is simple, but the ability to define and adjust gamma characteristics for different display panels is limited
Solution Approach 1:
The gamma selection unit includes M gamma selectors that can dynamically select different gamma voltages from the generated plurality of voltages. This allows the system to define and adjust gamma characteristics adaptively for different display panels without requiring complex reconfiguration
Solution Approach 2:
The system generates multiple voltages through voltage divisions and uses the gamma buffer unit to adjust inflection points by changing electrical parameters. This enables precise control of gamma curve characteristics through parameter modification rather than structural complexity
Data Source
AI summary
A gamma voltage controller includes a gamma distribution unit that generates a plurality of voltages by performing voltage divisions between a first gradation voltage and a N(th) gradation voltage, a gamma selection unit having first through M(th) gamma selectors that respectively select first through M(th) gamma voltages among the plurality of voltages, a gamma buffer unit that changes inflection points of the gamma curve, and buffers the first through M(th) gamma voltages to output buffered first through M(th) gamma voltages, and a gradation distribution unit that generates second through N−1(th) gradation voltages by performing voltage divisions among the buffered first through M(th) gamma voltages. Each of the buffers includes a feedback loop, and some of the buffers change inflection points of the gamma curve.