Glass-Substrate Backlight Layout for Uniform Light Source Repair
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Solution Overview
Problem
Existing display devices face issues with scattered light and dark regions when individual light sources are repaired, and there is a need for improved image quality and reduced manufacturing costs in backlight units.
Innovation Solution
A backlight unit design with high-density light sources on a glass substrate, featuring transistors to drive multiple light sources, and repair patterns adjacent to pad electrodes to prevent light scattering and dark regions, while reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If light sources are arranged in a grid pattern with transistors at intersection points, then light source density is improved, but light scattering and partial dark regions occur during repair
Solution Approach 1:
The patent divides the backlight unit into multiple independent blocks, where each block contains light sources arranged in a grid pattern. By segmenting the overall structure into manageable blocks with dedicated transistors for each block, the system maintains high light source density while enabling independent repair of individual blocks without affecting the entire display, thus preventing light scattering and partial dark regions during repair operations.
2Ease of manufacture
If transistors are arranged to drive multiple light sources, then manufacturing cost is reduced, but device complexity increases
Solution Approach 1:
The patent implements a multi-functional transistor architecture where each transistor is designed to control multiple light sources within its block. The transistors serve dual purposes: driving light sources during normal operation and facilitating repair operations by enabling selective blocking of light sources. This universal design reduces the total number of transistors needed, lowering manufacturing costs while maintaining manageable complexity through standardized block configurations.
3Illumination intensity
If light sources are arranged at high density, then image quality is improved, but repairability and uniformity deteriorate
Solution Approach 1:
The patent segments the high-density light source array into independent blocks, where each block can be individually addressed and repaired. This segmentation allows maintenance of high light source density for improved image quality while enabling selective repair operations that prevent uniformity issues during maintenance, as repairs can be performed on isolated blocks without affecting the entire display.
Solution Approach 2:
The patent applies local quality control by assigning specific transistors to control specific blocks of light sources. This localized control mechanism allows precise management of light emission in different regions, enabling high overall density while maintaining uniformity through localized adjustments during repair operations.
Data Source
AI summary
A backlight unit and a display device including the same are disclosed. More specifically, a backlight unit is disclosed that includes a plurality of light sources disposed on a glass substrate and disposed in a plurality of rows and a plurality of columns, and first and second transistors disposed on the glass substrate and spaced apart from each other, wherein each of the first transistor and the second transistor is disposed so as not to overlap the plurality of light sources disposed at points where two rows and two columns cross each other. Thus, image quality is excellent.