Gamma Amplifier Track Timing for Precise Display Gamma Voltages
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Solution Overview
Problem
Current display driver circuits face challenges in accurately generating gamma curves for display devices, leading to differences between actual and perceived luminance, which can result in suboptimal image quality due to the limitations of existing gamma voltage generators in terms of chip size and precision.
Innovation Solution
A gamma amplifier and gamma voltage generator system that includes a track period and compensation mechanism, utilizing multiple amplification devices and processing circuitry to generate fine and accurate gamma tab voltage levels, allowing for improved luminance correction and reduced chip size by sharing input signals among gamma amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing gamma voltage generators are used to generate gamma curves, then the chip size can be maintained, but the precision and accuracy of gamma tab voltage levels are insufficient
Solution Approach 1:
The gamma amplifier is divided into multiple amplification devices (first amplification device, second amplification device) that operate at different time periods. Each device processes gamma tab voltage levels for specific time intervals, allowing the system to achieve fine and accurate gamma curve division without requiring all devices to be active simultaneously, thus reducing chip size while maintaining precision.
Solution Approach 2:
The system uses periodic track periods and compensation periods where amplification devices are activated sequentially rather than continuously. The first amplification device operates during a first track period, then a second amplification device operates during a second track period. This periodic operation allows precise gamma voltage generation while reducing the number of simultaneously active components, thereby reducing chip size.
2Manufacturing precision
If multiple amplification devices are used to generate fine and accurate gamma curves, then the precision is improved, but the device complexity increases
Solution Approach 1:
Multiple amplification devices are merged into a single gamma amplifier unit that shares common input nodes, output nodes, and control circuitry. The first and second amplification devices share the same input node for receiving input signals and the same output node for providing gamma tab voltage levels. This merging reduces overall device complexity while maintaining the precision benefits of multiple amplification stages.
Solution Approach 2:
Each amplification device is designed to perform multiple functions: tracking input signals during track periods, compensating for offset voltages during compensation periods, and generating gamma tab voltage levels during subsequent time periods. The control circuitry universally manages both amplification devices, coordinating their operation across different time periods to achieve fine gamma curve division without requiring separate dedicated circuits for each function.
3Reliability
If offset voltage compensation is implemented, then the image quality is improved, but the processing time and complexity increase
Solution Approach 1:
Offset voltage compensation is performed in advance during dedicated compensation periods before the amplification devices need to generate gamma tab voltage levels. The first amplification device completes offset compensation during a first compensation period before its track period, and the second amplification device completes offset compensation during a second compensation period before its track period. This preliminary action ensures image quality is improved while the compensation time is efficiently utilized without delaying the main gamma voltage generation process.
Data Source
AI summary
Disclosed is a gamma amplifier which includes a first amplification device that receives a first input signal during a first track period in a first time period, compensates for a first offset voltage from the first input signal during a first compensation period in the first time period, and generates a first output signal during a second time period after the first time period based on a control signal, and a second amplification device that receives a second input signal during a second track period in the second time period, compensates for a second offset voltage from the second input signal during a second compensation period in the second time period, and generates a second output signal during a third time period after the second time period based on the control signal and processing circuitry configured to generate the control signal.