Source Driver IC Gamma Reference Voltage Generator Offset Control
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Solution Overview
Problem
Display devices suffer from image quality degradation due to the wavy noise phenomenon, characterized by the display of stripe-shaped transverse lines on the screen, which existing technologies have not effectively addressed.
Innovation Solution
A source driver integrated circuit and gamma reference voltage generator are designed with a programmable-gamma circuit having multiple stages of gamma amplifiers, multiplexer circuits, and offset control mechanisms to prevent or reduce wavy noise by managing the offset of each gamma amplifier stage, ensuring that their signal output timings do not have the same phase, thereby minimizing final offset deviations in the analog voltage output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple stages of gamma amplifiers are used to generate gamma reference voltage, then the gamma voltage precision is improved, but the offset deviation accumulates and causes wavy noise phenomenon
Solution Approach 1:
The gamma amplifier is divided into multiple stages (first stage, second stage, etc.), where each stage performs a portion of the gamma voltage generation. This segmentation allows for better control of offset at each stage while achieving the required overall precision, preventing the accumulation of large offset deviations that would cause wavy noise.
Solution Approach 2:
The invention changes the operating parameters of each gamma amplifier stage, specifically adjusting the gain and offset parameters of individual stages. By optimizing these parameters, the system achieves high gamma voltage precision while controlling the cumulative offset deviation to prevent wavy noise phenomenon.
2Measurement precision
If gamma amplifiers are arranged in multiple stages to improve image quality, then the gamma reference voltage accuracy is improved, but the offset timing alignment becomes complex and difficult to control
Solution Approach 1:
The invention applies preliminary offset compensation to each gamma amplifier stage before the final output is generated. By pre-adjusting the offset at each stage, the system simplifies the timing alignment process and avoids the need for complex post-processing to correct offset deviations, thereby reducing overall system complexity while maintaining high accuracy.
3Reliability
If the offset of each gamma amplifier stage is controlled to prevent wavy noise, then the image quality is improved, but the control mechanism becomes more complex
Solution Approach 1:
The gamma amplifier stages are designed with self-adjusting offset control mechanisms that automatically compensate for offset deviations without requiring complex external control circuits. Each stage monitors and adjusts its own offset parameters, simplifying the overall control mechanism while ensuring high image quality and preventing wavy noise phenomenon.
Data Source
AI summary
The present embodiments relate to a source driver integrated circuit and a gamma reference voltage generator, which can improve the image quality by preventing or reducing the wavy noise phenomenon, i.e. display of a pattern of stripe-shaped transverse lines on the screen.