Gamma Amplifier Switching for Precise Grayscale Voltage Output
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Solution Overview
Problem
Existing semiconductor devices face challenges in accurately and efficiently outputting subdivided grayscale voltages with small voltage differences, particularly in high-definition display panels, due to the complexity of offset removal in gamma amplifiers.
Innovation Solution
A semiconductor device is designed with multiple amplifier blocks that operate in alternating modes, including a holding mode for outputting tap voltages and a sampling mode for offset removal, controlled by a driving controller to ensure accurate grayscale voltage provision while minimizing power consumption and device area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple gamma amplifiers are used to output subdivided grayscale voltages, then the accuracy of grayscale voltage output is improved, but the device area and power consumption increase
Solution Approach 1:
The system divides the gamma amplifier functionality into multiple blocks (first gamma amplifier block, second gamma amplifier block, third gamma amplifier block), where each block handles specific tap voltages. This segmentation allows precise control of grayscale voltages while optimizing resource usage by having blocks share common circuitry and operate in coordinated modes.
Solution Approach 2:
The gamma amplifier blocks are designed with multi-functionality, capable of operating in both holding mode (outputting stable tap voltages) and sampling mode (updating offset values). This allows a single amplifier block to serve multiple purposes across different time periods, reducing the need for separate dedicated circuits for each function.
2Measurement precision
If offset removal is implemented in gamma amplifiers, then the precision of grayscale voltage output is improved, but the device complexity increases
Solution Approach 1:
The gamma amplifier blocks operate in periodic cycles, alternating between holding mode and sampling mode. During holding mode, amplifiers maintain stable output voltages. During sampling mode, they periodically update offset values based on input voltages. This periodic operation enables offset removal functionality while maintaining simple circuit designs, as each amplifier switches between two well-defined states rather than requiring complex continuous control.
Data Source
AI summary
In a semiconductor device, a first amplifier block operates in a holding mode for a first period to output a first tap voltage based on a first tap input voltage and an offset of a first gamma amplifier sampled. A second amplifier block operates in the holding mode during the first period to output a second tap voltage based on a second tap input voltage and an offset of a second gamma amplifier sampled. A third amplifier block operates in a sampling mode during the first period to sample an offset of a third gamma amplifier based on the second tap input voltage. Input terminal switches divide the first and second tap input voltages to the first to third amplifier blocks, and output terminal switches transmit the first tap voltage and the second tap voltage from at least some of the first to third amplifier block to a divider.