Display Device Gamma Compensation for Side Visibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices face challenges in enhancing side visibility and brightness, particularly when incorporating white sub-pixels, due to limitations in gamma compensation and voltage management across different gamma curves.
Innovation Solution
A display device and driving method that utilize a mapping unit, gamma compensator, renderer, and splitter to generate and convert gamma-compensated data into different gamma white data based on specific gamma curves, optimizing voltage distribution across sub-pixels to improve side visibility and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white sub-pixels are added to increase brightness, then display brightness is improved, but side visibility and gamma compensation become problematic
Solution Approach 1:
The invention divides white sub-pixels into multiple groups, where each group is driven by different gamma curves. This segmentation allows different regions of the display to use optimized gamma characteristics, improving side visibility while maintaining overall brightness enhancement from the white sub-pixels.
Solution Approach 2:
Different gamma curves are applied to different groups of white sub-pixels based on their positional characteristics. This local quality approach ensures that sub-pixels in specific regions (affecting side visibility) receive tailored gamma compensation, resolving the contradiction between brightness and side visibility.
2Reliability
If multiple gamma curves are used to improve side visibility, then side visibility is improved, but voltage management and data processing complexity increase
Solution Approach 1:
Gamma compensation values for multiple gamma curves are pre-calculated and stored in lookup tables before display operation. This preliminary action eliminates the need for complex real-time calculations during display driving, simplifying voltage management while maintaining multiple gamma curve functionality for improved side visibility.
Solution Approach 2:
Lookup tables serve as intermediaries between the input image data and the multiple gamma curves. The lookup tables store pre-computed compensation values that map input grayscale values to appropriate output values for different gamma curves, simplifying the voltage management process while enabling multiple gamma characteristics.
3Measurement precision
If gamma compensation is applied to all sub-pixels uniformly, then color accuracy is maintained, but side visibility distortion occurs
Solution Approach 1:
The invention applies different gamma compensation characteristics to different groups of white sub-pixels based on their positional requirements. Main color sub-pixels maintain uniform gamma compensation for color accuracy, while white sub-pixels in specific regions receive differentiated gamma compensation to eliminate side visibility distortion.
Solution Approach 2:
White sub-pixels are segmented into multiple groups with different gamma compensation characteristics. This segmentation allows the display to maintain color accuracy for main color sub-pixels while applying optimized gamma compensation to white sub-pixel groups that affect side visibility, resolving the contradiction between color accuracy and side visibility.
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 solution effectively enhances side visibility and brightness by averaging gamma compensation values for red, green, and blue sub-pixels, reducing distortion and improving image quality through precise voltage management.
Implementation Method 1
liquid crystal is injected between upper and lower substrates where a transparent electrode is formed and upper and lower polarizing plates are disposed at the outside of the upper and lower substrates to change the arrangement of the liquid crystal between the upper and lower substrates and to adjust the transmittance of light
Data Source
AI summary
A display device includes a mapping unit for mapping main color data having information on three main colors to generate mapped main data including red, green, and blue information and mapped white data including white information, a compensation lookup table for storing a plurality of gamma compensation values, a gamma compensator for generating compensated main data obtained by gamma-compensating the mapped main data based on a first gamma compensation value corresponding to first gamma white data from among the plurality of gamma compensation values and a second gamma compensation value corresponding to second gamma white data from among the plurality of gamma compensation values by referring to the compensation lookup table, a renderer for sub-pixel-rendering the mapped white data to generate rendered white data, and a splitter for converting the rendered white data into the first and second gamma white data based on different first and second gamma curves, respectively.