Display Gamma Voltage Generation Using Color-Specific Reference Sets
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Solution Overview
Problem
Conventional display systems generate gamma voltages for red, green, and blue color pixels using a shared reference gamma set, leading to improper reflection of luminance characteristics and potential distortion of color coordinates and gamma curves during gamma tuning.
Innovation Solution
A display system where a source device individually controls and transmits separate reference gamma sets for red, green, and blue color pixels to a sink device, which generates and updates corresponding gamma voltages for each color, optimizing image quality by preventing gamma curve and color coordinate distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared reference gamma set is used for all color pixels, then device complexity is reduced, but luminance characteristic accuracy and color coordinate precision deteriorate
Solution Approach 1:
The patent divides the single shared reference gamma set into separate color-specific reference gamma sets (red, green, blue). Each color channel now has its own dedicated reference gamma set that reflects its specific luminance characteristics, eliminating the need for approximation and improving precision without significantly increasing system complexity.
Solution Approach 2:
The patent applies different reference gamma sets to different color channels based on their specific luminance characteristics. Instead of using a uniform approach for all colors, each color channel receives a locally optimized reference gamma set that matches its unique properties, thereby improving overall luminance accuracy.
2Ease of operation
If a shared reference gamma set is used for all color pixels, then ease of operation is improved, but color coordinate accuracy and gamma curve fidelity deteriorate
Solution Approach 1:
The patent segments the gamma voltage generation process into separate operations for each color channel. Each channel uses its own reference gamma set, allowing independent optimization of color coordinates and gamma curves without affecting other channels, thus maintaining operational simplicity while improving precision.
Solution Approach 2:
The patent changes the parameter set used for gamma voltage generation from a single shared reference to multiple color-specific references. This parameter differentiation allows each color channel to be tuned independently for optimal color coordinate accuracy and gamma curve fidelity.
3Reliability
If luminance clipping is performed on blue color to improve luminance linearity, then blue color luminance linearity is improved, but red and green color gamma curves become distorted using shared reference
Solution Approach 1:
The patent segments the reference gamma sets by color channel, allowing luminance clipping to be applied independently to the blue color reference gamma set without affecting the red and green color reference gamma sets. This isolation prevents the distortion that would otherwise propagate across all color channels.
Solution Approach 2:
The patent applies luminance clipping as a local adjustment specifically to the blue color channel's reference gamma set, where it is needed to improve luminance linearity. The red and green color channels maintain their original reference gamma sets, preserving their gamma curve accuracy while still benefiting from the overall system improvement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively optimizes image quality by allowing individual control and updating of gamma voltages for each color, improving luminance linearity and preventing distortion, thus enhancing the display's color accuracy and overall image quality.
Implementation Method 1
perform a digital-to-analog conversion for converting the red color display data, the green color display data, and the blue color display data into red color display data voltages, green color display data voltages, and blue color display data voltages
Data Source
AI summary
A display system includes a source device and a sink device. The source device generates red-color display data, green-color display data, and blue-color display data and transmits first packet data including the red-color display data and a red-color display reference gamma-set, second packet data including the green-color display data and a green-color display reference gamma-set, and third packet data including the blue-color display data and a blue-color display reference gamma-set. The sink device converts the red-color display data, the green-color display data, and the blue-color display data into red-color display data-voltages, green-color display data-voltages, and blue-color display data-voltages and displays an image using the red-color display data-voltages, the green-color display data-voltages, and the blue-color display data-voltages. The sink device generates red-color display gamma-voltages, green-color display gamma-voltages, and blue-color display gamma-voltages based on the red-color display reference gamma-set, the green-color display reference gamma-set, and the blue-color display reference gamma-set, respectively.