Luminance Unevenness Correction for Open-Cell LCD Panels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid-crystal display panels without a backlight (open cells) face challenges in luminance unevenness correction due to inherent backlight luminance unevenness, which complicates image correction and can lead to excessive corrections when used in final products with different backlight specifications.
Innovation Solution
A luminance-unevenness correction system that includes an inspection backlight, an imaging device, and a correction device to generate and transmit correction data, specifically extracting panel luminance-distribution data to isolate and correct luminance unevenness unique to the liquid-crystal display panel, while accounting for and excluding luminance unevenness from the inspection backlight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inspection backlight is used to illuminate the open-cell liquid-crystal display panel for correction, then the panel can be corrected for luminance unevenness, but the inherent luminance unevenness of the inspection backlight itself interferes with the correction accuracy
Solution Approach 1:
The patent extracts and separates the backlight luminance distribution characteristics from the panel luminance distribution characteristics by independently imaging the backlight. This allows the correction device to identify and exclude the harmful backlight luminance unevenness from the correction process, improving measurement precision without being affected by the inspection backlight's inherent luminance unevenness.
Solution Approach 2:
The patent introduces an intermediary process where the backlight luminance distribution is first imaged and stored as reference data, then used to adjust the correction calculations. This intermediary step acts as a mediator that separates the harmful backlight characteristics from the correction process, allowing accurate panel correction despite backlight imperfections.
2Manufacturing precision
If correction data is generated from images taken with an inspection backlight having luminance unevenness, then the panel luminance can be corrected, but excessive correction occurs when the panel is used in final products with different backlight specifications
Solution Approach 1:
The patent extracts the backlight-specific luminance characteristics as separate correction parameters. By identifying and isolating the backlight luminance distribution from the combined panel-backlight image, the system generates correction data that specifically targets panel luminance unevenness without incorporating backlight-specific characteristics, ensuring adaptability to different backlight specifications in final products.
Solution Approach 2:
The patent segments the correction process into two distinct components: backlight luminance distribution characterization and panel luminance unevenness correction. This segmentation allows the correction data to be specifically tailored for panel defects only, improving manufacturing precision while maintaining versatility across different backlight types and specifications.
3Illumination intensity
If the density of light source arrangement in the inspection backlight is increased to improve luminance uniformity, then luminance unevenness is reduced, but facility costs increase
Solution Approach 1:
The patent changes the approach from physical modification (increasing light source density) to computational correction. By using imaging and data processing to characterize and correct backlight luminance unevenness, the system achieves improved luminance uniformity without the need for expensive hardware modifications, maintaining ease of manufacture while improving illumination quality.
Solution Approach 2:
The patent replaces the mechanical approach of increasing light source density with a computational approach using imaging devices and correction algorithms. This substitution eliminates the need for expensive hardware changes while achieving the same goal of improved luminance uniformity, reducing facility costs while maintaining illumination quality.
Data Source
AI summary
A luminance-unevenness correction system includes the following: an inspection backlight; an imaging device that generates imaged panel data by imaging a liquid-crystal display panel being illuminated with the inspection backlight; and a correction device that generates correction data and transmits the correction data to the liquid-crystal display panel. The correction data is used for correcting the luminance unevenness of the liquid-crystal display panel. The imaging device can generate backlight luminance-distribution data indicating the luminance distribution of the inspection backlight, by imaging the inspection backlight remaining on. The correction device extracts panel luminance-distribution data from the imaged panel data and the backlight luminance-distribution data, and generates the correction data in accordance with the panel luminance-distribution data extracted. The panel luminance-distribution data indicates luminance unevenness specific to the liquid-crystal display panel.