Single-Layer Light-Emitting Substrate for Overlap-Free Backlights
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving high contrast, luminance uniformity, and stability due to the complexity and cost of backlight manufacturing, particularly with the overlapping issues of short circuits and open circuits caused by multiple electrically conductive layers in traditional designs.
Innovation Solution
A light-emitting substrate with a single electrically conductive layer that integrates driving circuits and light-emitting units, featuring a specific arrangement of signal lines and terminals to prevent overlap and simplify manufacturing, while using a shielding ring for electrostatic shielding and a buffer layer for stress reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple electrically conductive layers are used in traditional backlight designs, then electrical connection and signal transmission are achieved, but overlapping issues of short circuits and open circuits occur, increasing manufacturing complexity and cost
Solution Approach 1:
The patent merges multiple electrically conductive layers into a single electrically conductive layer, integrating driving circuits and light-emitting units within this unified layer. This consolidation eliminates the overlapping problems between multiple layers while maintaining all necessary electrical connections, thereby reducing manufacturing complexity and improving reliability.
Solution Approach 2:
The patent transitions from a multi-layer vertical structure to a single-layer planar structure with complex routing. By redistributing electrical connections within the same layer rather than stacking layers, the design avoids overlap issues while achieving the same electrical functionality through in-plane signal routing.
2Reliability
If multiple electrically conductive layers are used in traditional backlight designs, then electrical connection is achieved, but production costs increase due to manufacturing complexity
Solution Approach 1:
The patent merges multiple electrically conductive layers into a single electrically conductive layer, integrating driving circuits and light-emitting units within this unified layer. This consolidation eliminates the overlapping problems between multiple layers while maintaining all necessary electrical connections, thereby reducing manufacturing complexity and improving reliability.
3Illumination intensity
If traditional backlight structures are used, then basic light emission is achieved, but luminance uniformity and contrast are insufficient
Solution Approach 1:
The patent segments the backlight into multiple independently controllable light-emitting regions, each with its own driving circuit. This segmentation enables precise control of luminance in different areas, improving overall luminance uniformity and contrast by allowing independent adjustment of each region's brightness level.
Solution Approach 2:
The patent implements dynamic control of light-emitting units through driving circuits that can adjust the emission intensity of each region in real-time. This dynamic capability enables adaptive luminance adjustment to achieve uniformity across the display area while maintaining the ability to create high-contrast images.
Data Source
AI summary
The present disclosure provides a light-emitting substrate and a manufacturing method thereof, a backlight and a display device. The light-emitting substrate includes a substrate including a plurality of light-emitting regions arranged in an array, each of the plurality of light-emitting regions including a driving circuit and at least one light-emitting unit connected to the driving circuit, a first electrically conductive portion on the substrate and connected to the driving circuit and the at least one light-emitting unit in each light-emitting region, and a second electrically conductive portion on the substrate and including a plurality of pads. The first electrically conductive portion and the second electrically conductive portion are on a same layer.