Liquid Crystal Display ECB Sub Pixel Brightness Adjustment
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Solution Overview
Problem
Liquid crystal displays with quad-type cells face issues with interference images from ECB sub pixels overlapping with RGB sub pixel images, particularly when viewed from different angles, due to varying brightness levels between the display image and background screen.
Innovation Solution
A liquid crystal display system that includes a storage of look-up tables for ECB brightness data, an image processor to calculate brightness data distribution, and a data aligner to combine and align ECB brightness data with RGB data based on the calculated distribution, allowing for automatic adjustment of interference image brightness according to the background screen's brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If quad-type cells with ECB sub pixels are used to provide wide viewing angle capability, then viewing angle performance is improved, but interference images from ECB sub pixels overlap with RGB sub pixel images when viewed from the front
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the brightness level of ECB sub pixels based on the brightness distribution of the displayed image. The system calculates brightness data distribution and selects appropriate ECB brightness values from look-up tables to minimize interference while maintaining wide viewing angle capability. This adaptive parameter adjustment resolves the contradiction by making the harmful interference effect dependent on viewing conditions rather than fixed.
Solution Approach 2:
The patent implements feedback mechanisms through the image processor that analyzes the brightness distribution of the input image and feeds this information back to the data aligner. The data aligner then uses this feedback to selectively adjust ECB sub pixel brightness values, creating a closed-loop system that continuously optimizes the balance between viewing angle performance and interference minimization based on actual display content.
2Shape
If ECB sub pixels are activated to provide wide viewing angle mode, then viewing angle is improved, but brightness of interference image varies with background screen brightness
Solution Approach 1:
The patent applies dynamics by making the ECB sub pixel brightness adaptive rather than fixed. The system dynamically adjusts ECB brightness values in real-time based on the calculated brightness data distribution of the displayed image. This dynamic adjustment ensures that the interference image brightness remains appropriate across different background screen brightness levels, resolving the contradiction between providing wide viewing angle and maintaining consistent interference characteristics.
Solution Approach 2:
The patent uses parameter changes by implementing multiple look-up tables with different ECB brightness values corresponding to different brightness data distributions. The system changes the brightness parameter of ECB sub pixels based on the specific imaging conditions, allowing the interference image brightness to be optimized for each brightness level rather than remaining constant.
3Object-generated harmful factors
If automatic brightness adjustment of ECB sub pixels is implemented, then interference image perception is reduced, but device complexity increases due to image processor and storage requirements
Solution Approach 1:
The patent applies copying by using look-up tables that store pre-calculated ECB brightness values corresponding to different brightness data distributions. Instead of performing complex real-time calculations, the system copies appropriate pre-computed values from the look-up tables based on the input image characteristics. This approach significantly reduces the computational burden on the image processor while still achieving effective interference minimization.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing multiple sets of ECB brightness values in look-up tables during system initialization or offline processing. This preliminary preparation allows the image processor to simply retrieve appropriate values during actual display operation, rather than performing complex real-time optimization calculations, thereby reducing device complexity while maintaining effective interference image suppression.
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 reduces or eliminates the perception of interference images overlapping with display images when viewed from the front, by adjusting the brightness of ECB sub pixels in accordance with the background screen's brightness, thereby improving viewing angles and image clarity.
Implementation Method 1
ECB (Electrical Controlled Birefringence) sub pixels
Implementation Method 2
a liquid crystal layer disposed between two substrates. In operation, an electric field is applied across the liquid crystal layer using opposing electrodes to controls the light transmittance
Implementation Method 3
An electric field is generated between the pixel electrode and the common electrode. The electric field controls the arrangement of liquid crystal molecules of the liquid crystal cell Clc between the pixel electrode and the common electrode to modulate the transmission of light
Data Source
AI summary
A liquid crystal display for automatically adjusting brightness of interference image displayed at ECB sub pixels of quad type cells of a liquid crystal display panel in accordance with brightness of a background screen is disclosed. The liquid crystal display includes first to n-th look-up tables each holding a mapping of one first to n-th mappings of ECB brightness data to cell location information for the quad cells of the liquid crystal display panel; an image processor that calculates a brightness data distribution of an image; and a viewing angle controller that selects one of the first to the n-th look-up tables depending on the calculated brightness data distribution.