Gamma Control Circuit Segmented Resistor Arrays
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Solution Overview
Problem
Conventional gamma control circuits are large in size and inconvenient to use due to limited voltage adjustment range, necessitating a compact solution that can provide various gamma curves for display devices.
Innovation Solution
A gamma control circuit with a small chip size that selects and generates gray-scale voltages by using a combination of resistor arrays and voltage selectors to produce a range of voltages, eliminating the need for variable resistors, allowing for precise control of gray-scale voltages and gamma curve adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable resistors are used to control gray-scale voltages, then the voltage adjustment range is limited, but the circuit size increases
Solution Approach 1:
The gray-scale voltage control is segmented into multiple discrete selectable levels using resistor arrays divided into multiple segments. Each segment can be independently selected through control signals, providing multiple fixed voltage levels without requiring continuous variable resistor adjustment. This segmentation allows a compact circuit to provide multiple gray-scale voltage options.
Solution Approach 2:
The circuit dynamically selects different resistor segments based on control signals to change the effective resistance value. By using switchable resistor arrays where different portions can be connected or disconnected based on control signals, the circuit achieves dynamic voltage adjustment without physical variable resistors, reducing circuit size while maintaining adaptability.
2Adaptability or versatility
If multiple variable resistors are used to broaden voltage adjustment range, then the voltage control capability improves, but the integrated circuit chip size increases
Solution Approach 1:
Multiple resistor arrays are merged into a unified switchable network controlled by multiple control signals. Instead of using separate variable resistors for each gray-scale voltage, the invention combines multiple fixed resistor arrays that can be selectively connected through control signals, achieving the function of multiple variable resistors in a more compact integrated structure.
Solution Approach 2:
The resistor arrays serve multiple functions: they provide reference voltages, generate gray-scale voltages, and enable gamma curve adjustment through selective connection of different segments. This multi-functionality eliminates the need for separate dedicated components for each function, reducing overall chip size while maintaining comprehensive voltage control capability.
Data Source
AI summary
A gamma control circuit includes a first gray-scale voltage selection unit that selects and outputs a highest gray-scale voltage and a lowest gray-scale voltage from among a plurality of first voltages present between a first supply voltage and a second supply voltage. A second gray-scale voltage selection unit receives the highest and lowest gray-scale voltages and selects and outputs a first intermediate voltage and a second intermediate voltage between the highest and lowest gray-scale voltages. A third gray-scale voltage selection unit receives the highest and lowest gray-scale voltages and the first and second intermediate voltages and generates a plurality of reference voltages from the received voltages. A gray-scale voltage generation unit receives the highest and lowest gray-scale voltages and the plurality of reference voltages and outputs a plurality of gray-scale voltages.