Gamma Adjustment Circuit for Display Driver Adaptability
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Solution Overview
Problem
Existing display technologies face challenges in matching gamma curves with display panel characteristics, leading to unsatisfied luminance characteristics when panel changes occur, and there is a need for improved integration and expanded gamma adjustment ranges in display driver circuits.
Innovation Solution
A gamma adjustment circuit with a first decoder, amplifier, and second decoder, along with a resistor configuration, is used to receive and process voltage signals, expanding the gamma adjustment range and improving integration by controlling the output voltage to match the display panel's requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gamma curve is designed in accordance with the characteristics of a specific display panel, then the luminance characteristics are optimized for that panel, but the luminance characteristics are not satisfied when the characteristics of the display panel change
Solution Approach 1:
The patent implements dynamic gamma curve adjustment by providing multiple gamma curves stored in memory and selecting the appropriate curve based on detected display panel characteristics. The system transitions from a static gamma curve design to a dynamic one that adapts to different panel types, ensuring reliable luminance characteristics across various display panels.
Solution Approach 2:
The patent changes the parameter of gamma curve selection based on display panel characteristics detection. By detecting parameters such as threshold voltage and mobility of the display panel and selecting corresponding gamma curves, the system optimizes luminance characteristics for different panel variations without requiring hardware changes.
2Reliability
If hardware associated with the gamma curve is changed to satisfy luminance characteristics of changed display panel, then luminance characteristics are satisfied, but the size of the display driver increases
Solution Approach 1:
The patent makes the display driver universal by incorporating multiple gamma curves and detection capabilities into a single driver circuit. This multi-functional design allows one driver to support multiple display panel types and characteristics, eliminating the need for separate hardware for each panel type and reducing overall system complexity.
Solution Approach 2:
Instead of creating multiple physical hardware copies for different display panels, the patent uses digital copying of gamma curve data stored in memory. The same physical driver hardware can load and switch between different gamma curve representations, achieving support for multiple panel types without duplicating the physical driver circuitry.
3Device complexity
If the size of the display driver is reduced, then the bezel thickness is reduced, but the integration degree and gamma adjustment range are limited
Solution Approach 1:
The patent replaces physical expansion of driver hardware with digital signal processing and software-based gamma curve selection. By using digital decoders, memory storage for multiple gamma curves, and signal processing techniques, the system expands gamma adjustment capabilities without increasing physical driver size, enabling reduced bezel thickness while maintaining adaptability.
Data Source
AI summary
A gamma adjustment circuit includes: a first node; a second node; a first decoder to which a first voltage signal and a second voltage signal are provided and which outputs either one of the first voltage signal and the second voltage signal as a third voltage signal; an amplifier receiving the third voltage signal as a positive input and outputting a fourth voltage signal; a second decoder receiving the fourth voltage signal and outputting the provided fourth voltage signal as a fifth voltage signal to one of the first and second nodes; a third decoder connected to the first and second nodes, receives the fifth voltage signal from one of the first and second nodes, and outputs the fifth voltage signal to a negative input terminal of the amplifier as a sixth voltage signal; and a first resistor connected between the first node and the second node.