Source Driver Gamma Voltage Adjustment for Display Devices
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Solution Overview
Problem
Display devices face challenges in maintaining constant optical characteristics when the drive frequency varies, leading to observable changes and reduced perceived image quality.
Innovation Solution
A source driver with a gamma voltage generation circuit that adjusts gamma voltages based on drive frequency, using a combination of reference gamma voltages and offsets, and interpolation to maintain consistent optical characteristics, while reducing manufacturing costs by storing fewer reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the drive frequency is varied to reduce power consumption, then power consumption is reduced, but optical characteristics change and perceived image quality deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting gamma voltages based on the drive frequency. The gamma voltage generation circuit modifies the gamma voltage parameters in response to frequency variations, allowing the display device to maintain optimal optical characteristics across different operating frequencies while enabling power consumption reduction through frequency switching.
2Reliability
If reference gamma voltage offsets are stored for all gray scale values, then optical characteristics are maintained accurately, but manufacturing costs increase
Solution Approach 1:
The patent applies segmentation by dividing the full range of gray scale values into multiple regions and storing reference gamma voltage offsets only at the boundaries of these regions (inflection points). The gamma voltage generation circuit then interpolates the offset values for gray scale values between the stored reference points, reducing the number of stored reference values while maintaining accurate optical characteristics across the entire gray scale range.
3Ease of manufacture
If the number of reference gamma voltage offsets is reduced, then manufacturing costs decrease, but optical characteristics may deteriorate
Solution Approach 1:
The patent introduces an intermediary mechanism - the gamma voltage generation circuit - that calculates and interpolates gamma voltage offsets based on stored reference values at inflection points. This intermediary circuit processes the reduced set of reference data to generate accurate offset values for all gray scale values, enabling cost reduction while maintaining optical characteristic reliability through mathematical interpolation rather than direct storage of all values.
Data Source
AI summary
A source driver includes a gamma voltage generation circuit. The gamma voltage generation circuit generates a gamma voltage and varies a gamma voltage based on a drive frequency. A data voltage generation circuit generates a data voltage based on the gamma voltage.