Liquid Crystal Display Voltage Compensation for Luminance Uniformity
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Solution Overview
Problem
As liquid crystal display devices increase in size, display defects such as luminance variation occur due to potential differences, especially when formed by multiple panels, affecting the center portion of the image, which is a major portion of the display.
Innovation Solution
A liquid crystal display device with a storage unit storing setting values for voltages applied to the counter electrode, and a drive unit that applies these values to minimize luminance variation at the edges, allowing optimal image display across multiple panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display screen size is increased, then the display area is enlarged, but display characteristics vary across the screen due to potential differences
Solution Approach 1:
The display screen is divided into multiple liquid crystal panels, each panel being optimized independently. By segmenting the large display into smaller manageable units, the patent can control and compensate for potential differences in each segment, thereby maintaining overall display uniformity across the enlarged screen area.
Solution Approach 2:
Different voltage values are applied to different regions (panels) of the display screen based on their specific characteristics. Each panel receives customized voltage compensation to account for local variations in potential, ensuring uniform display characteristics across the entire enlarged screen despite manufacturing variations.
2Area of stationary object
If multiple liquid crystal panels are used to form a large display screen, then the display area is increased, but luminance variation occurs at the center portion of the image
Solution Approach 1:
The patent applies different voltage parameters to different liquid crystal panels based on their positions and characteristics. By dynamically adjusting voltage values as a parameter, the system compensates for potential differences between panels and maintains uniform luminance across the entire display screen, even when multiple panels are used to create a large display area.
3Manufacturing precision
If voltage is optimized for the center portion of the display, then the center image quality is improved, but luminance variation occurs at the end portion
Solution Approach 1:
Instead of applying a single voltage optimization for the entire display, the patent applies different voltage values to different regions. The center portion receives optimization for its specific requirements while end portions receive adjusted voltages to compensate for their different characteristics, thereby achieving local quality optimization without sacrificing overall luminance uniformity.
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel and a control unit. The control unit stores a plurality of setting values of a voltage applied to a counter electrode. The setting value is a value of the applied voltage at which variation in luminance appears at a portion located apart from a reference portion that is a region in the liquid crystal panel.