White Balance Adjusting Module for Display Devices
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Solution Overview
Problem
Liquid crystal displays face challenges in maintaining consistent white chromaticity across gray scales due to varying opto-electronic effects from different driving voltages, leading to distorted color representation and low transmission rates.
Innovation Solution
A white balance adjusting method that measures stimulus values for each gray scale, defines the highest voltage for each pixel, and uses a root-mean-square minimum error method to create an adjusted look-up table, ensuring a white brightness gamma value of 2.2, thereby increasing the transmission rate without gray scale reversal or discontinuous look-up tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If different driving voltages are applied to red, green and blue pixels to adjust white chromaticity, then color representation is improved, but transmission rate decreases and gray scale reversal occurs
Solution Approach 1:
The patent changes the voltage parameters for red, green and blue pixels differently across gray scales to maintain white chromaticity consistency. By adjusting the voltage assignment strategy and using a root-mean-square minimum error method to optimize the look-up table, the system achieves consistent white chromaticity while avoiding gray scale reversal and maintaining high transmission rate.
2Measurement precision
If highest voltage is restricted to maximum stimulus value to prevent gray scale reversal, then measurement precision is improved, but transmission rate decreases
Solution Approach 1:
The patent performs preliminary measurement of stimulus values for each gray scale and pre-calculates the optimal voltage assignments using the root-mean-square minimum error method. By preparing the look-up table in advance with optimized voltage mappings, the system ensures both measurement precision and high transmission rate without requiring real-time adjustments that would cause gray scale reversal.
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
Enhances the transmission rate and color representation performance by up to 5% by optimizing the white balance adjustment, ensuring consistent white chromaticity across all gray scales.
Implementation Method 1
different rotating angles of the liquid crystal molecules cause different opto-electronic effects
Data Source
AI summary
A display device and a white balance adjusting method of the display device are provided. The white balance adjusting method comprises the following steps: measuring a stimulus value of each of gray scales of each of pixels of a panel; defining a highest voltage of each of the pixels at a maximum of the stimulus value; re-defining a white highest voltage using a first white balance pixel look-up table according to the highest voltage of each of the pixels; defining a target value for a white balance color pixel degree adjustment according to the white highest voltage and a corresponding white chromaticity; and acquiring an adjusted second white balance pixel look-up table to complete a white balance adjustment of the display device.