Gamma Data Compensation for Display Panel Color Consistency
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Solution Overview
Problem
Display devices, such as liquid crystal displays, face issues with irregular or biased color representation due to differing gamma characteristics between red, green, and blue pixels, leading to inconsistent display characteristics across different devices even when using the same gamma data and color correction.
Innovation Solution
A system for compensating gamma data using a feedback voltage system, which includes a display panel with pixels, data lines, gate lines, and feedback lines, a gray voltage generator, a data driver, a multiplexer, an A/D converter, and a signal controller that adjusts gamma data based on feedback gamma data to ensure optimal display characteristics for each device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same gamma data is applied to all display devices, then manufacturing simplicity is maintained, but display characteristics become inconsistent across devices
Solution Approach 1:
The patent implements a feedback mechanism where the display device measures its own actual gamma characteristics and uses this feedback information to adjust and compensate gamma data. The system includes a measurement unit that obtains feedback gamma data by driving pixels with test voltages and measuring resulting voltages, then uses this feedback to calculate compensated gamma values that correct for device-specific variations, thereby ensuring consistent display characteristics across different devices while maintaining manufacturing simplicity
Solution Approach 2:
The patent changes the gamma data parameters based on measured feedback from each display device. By measuring actual gamma characteristics and calculating compensated gamma values that adjust the voltage-gray level mapping parameters, the system adapts gamma data to match each device's specific characteristics, ensuring consistency without requiring complex manufacturing processes
2Measurement precision
If adaptive color correction is performed by independently modifying gamma curves for R, G, and B, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the gamma correction process into independent measurements and adjustments for each color channel (R, G, B). The measurement unit separately measures feedback gamma data for each color by driving pixels with specific test voltages and measuring resulting voltages, then independently calculates compensated gamma values for each color channel, enabling precise color correction while maintaining a relatively simple system architecture
Solution Approach 2:
The display device performs self-measurement and self-correction of gamma characteristics. The measurement unit within the device drives its own pixels with test voltages, measures the resulting voltages to obtain feedback gamma data, and calculates compensated gamma values without requiring external measurement equipment or complex external correction systems, thereby improving color accuracy while limiting complexity increases
3Reliability
If feedback measurement and compensation processes are implemented, then display characteristic consistency is improved, but manufacturing time and complexity increase
Solution Approach 1:
The patent performs preliminary measurement and compensation of gamma characteristics during the manufacturing or initialization phase. The measurement unit obtains feedback gamma data by driving pixels with test voltages and measuring resulting voltages before normal operation, calculates compensated gamma values in advance, and stores these compensation parameters for use during normal display operation, thereby ensuring consistency without significantly impacting manufacturing productivity
Solution Approach 2:
The patent replaces complex mechanical measurement and adjustment systems with electrical measurement and computational compensation. Instead of using physical measurement equipment and manual adjustment mechanisms, the system uses electrical signals to drive pixels, measures resulting voltages electronically, and computationally calculates compensated gamma values, thereby improving display characteristic consistency while minimizing increases in manufacturing time and complexity
Data Source
AI summary
A system for compensating for gamma data is provided comprising a display panel including at least one feedback line connected to at least one pixel, a gray voltage generator generating a reference gray voltage based on first gamma data, a data driver generating a data voltage based on the reference gray voltage and applying the generated data voltage to a data line, a multiplexer receiving at least one feedback voltage from the at least one feedback line and selecting a feedback voltage from the received at least one feedback voltage and outputting the selected feedback voltage, an A/D converter converting the selected feedback voltage into feedback data, and a signal controller storing the feedback data as feedback gamma data for the entire grays and compensating for the first gamma data based on the feedback gamma data.