Timing Controller Gamma Correction for Display Luminance Uniformity
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Solution Overview
Problem
Display devices without luminance correction exhibit irregularities due to differences in luminance levels across the same gray scale, failing to meet customer demands for high-quality image display.
Innovation Solution
A display device with a timing controller that includes a first processor to output a test image signal and a second processor to correct a reference gamma voltage based on luminance information measured by an internal or external light measurer, allowing for internal gamma correction without an external host.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a display device performs luminance correction using an external host and light measurer, then image quality is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The patent combines the timing controller, light measurer controller, and gamma correction functions into a single integrated timing controller unit. This merging eliminates the need for external hosts and separate light measurers, reducing system complexity while maintaining luminance correction capability. The integrated controller directly controls the light measurer and processes luminance information internally to adjust gamma voltages.
Solution Approach 2:
The display device performs self-diagnosis and self-correction by internally measuring its own luminance output and automatically adjusting gamma voltages based on the measured data. The timing controller executes the correction algorithm using stored reference data and luminance information from the light measurer, enabling the system to correct its own luminance irregularities without external intervention.
2Measurement precision
If gamma correction is performed using external equipment, then luminance accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The display device automatically performs luminance measurement and gamma correction without requiring external hosts or manual intervention. The timing controller autonomously controls the light measurer, processes the measured luminance information, and adjusts gamma voltages based on stored reference data, making the operation simple and user-friendly while maintaining high measurement precision.
Solution Approach 2:
The system implements a closed-loop feedback mechanism where the light measurer continuously monitors the actual luminance output, and the timing controller uses this feedback information to automatically adjust gamma voltages. The luminance information from the light measurer is compared with reference luminance data, and correction voltages are applied to eliminate deviations, ensuring accurate luminance measurement and correction.
3Manufacturing precision
If multiple processors are used for gamma correction, then correction accuracy is improved, but device complexity increases
Solution Approach 1:
The timing controller is divided into two functional processors: a first processor responsible for generating test image signals and controlling the display panel, and a second processor dedicated to gamma correction operations including controlling the light measurer, processing luminance information, and adjusting gamma voltages. This segmentation allows each processor to specialize in specific tasks, improving correction accuracy while keeping the overall architecture manageable through clear functional separation.
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
Ensures uniform luminance across the display, enhancing image quality by automatically adjusting gamma voltages based on measured luminance, reducing the need for external hosts and enabling software updates for compatibility with different light measurers.
Implementation Method 1
a light measurer electrically connected with the timing controller, and configured to measure luminance information of the test image and output the measured luminance information to the timing controller
Data Source
AI summary
A display device is provided including a timing controller configured to output a test image signal, a data driver configured to output a plurality of data voltages corresponding to the test image signal; and a display panel configured to display a test image corresponding to the data voltages, wherein the timing controller includes a first processor configured to output the test image signal in response to a test signal, and a second processor configured to receive luminance information of the test image, correct a predetermined reference gamma voltage corresponding to the test image with reference to the received luminance information, and output the test signal, which corresponds to the reference gamma voltage, to the first processor.