Backlight Module Light Shielding Structure for Display Devices
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Solution Overview
Problem
Peripheral light leakage occurs in display devices due to incomplete black matrix coverage, transparent UV-curable adhesives, and uneven adhesive frame surfaces, allowing light to pass through non-display areas.
Innovation Solution
A backlight module with a first frame and a first light shielding structure made of rubber, which overlaps with substrate light shielding structures adjacent to the display substrate's edge, increasing the gap length to prevent light leakage, and includes a second light shielding structure using black UV-curable adhesive to cover binding areas and protect wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is provided within the non-display area of the color filter substrate, then light shielding is improved, but the black matrix does not extend to the edge of the color filter substrate, causing light leakage at the periphery
Solution Approach 1:
The light shielding function is segmented into multiple components: the black matrix on the color filter substrate, the binding area light shielding structure on the array substrate, and the rubber strip light shielding structure on the adhesive frame. Each segment addresses a specific region, collectively achieving complete peripheral light shielding without requiring the black matrix to extend to the absolute edge.
Solution Approach 2:
The solution transitions from a two-dimensional planar black matrix to a three-dimensional multi-layer light shielding system. The rubber strip light shielding structure adds vertical dimension by extending from the adhesive frame toward the color filter substrate, creating overlapping light shielding layers that block light from multiple angles and prevent peripheral leakage.
2Reliability
If UV-curable adhesive is used to protect binding wires in the binding area, then wire protection is improved, but the adhesive is transparent or white and allows light to pass through
Solution Approach 1:
A binding area light shielding structure (black matrix or similar opaque material) is introduced as an intermediary layer between the UV-curable adhesive and the light source. This intermediary blocks light from passing through the transparent adhesive while allowing the adhesive to maintain its wire protection function, effectively decoupling the protective function from the light transmission property.
3Strength
If a rubber strip is provided between the adhesive frame and the array substrate, then structural support is improved, but the adhesive frame surface is uneven, creating gaps that allow light to pass through
Solution Approach 1:
The solution changes the geometric parameters of the rubber strip by extending it not only in the horizontal direction but also vertically toward the color filter substrate. This parameter change creates an overlapping light shielding structure that eliminates gaps caused by surface unevenness while maintaining the rubber strip's structural support and sealing functions.
4Area of stationary object
If the black matrix and UV-curable adhesive are used in the non-display area, then component coverage is improved, but light can still pass through the peripheral area, causing light leakage
Solution Approach 1:
The light shielding structures are nested in multiple layers: the black matrix is nested on the color filter substrate, the binding area light shielding structure is nested on the array substrate within the binding area, and the rubber strip light shielding structure is nested on the adhesive frame. These nested structures create overlapping light shielding zones that collectively block peripheral light leakage while maintaining comprehensive component coverage.
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
Effectively suppresses peripheral light leakage by shielding uncovered areas around the display substrate edges and binding areas, enhancing display device performance.
Implementation Method 1
a first light shielding structure provided between the first portion and the display substrate, wherein a vertical projection of the first light shielding structure on a plane in which the display substrate is located at least partially overlaps with at least one substrate light shielding structure adjacent to an edge of the display substrate
Implementation Method 2
a second light shielding structure provided on the array substrate and covering a binding area within a non-display area of the array substrate, the second light shielding structure including black UV-curable adhesive
Data Source
AI summary
A backlight module includes: a first frame having a first portion parallel to the display substrate; and a first light shielding structure provided between the first portion and the display substrate, wherein a vertical projection of the first light shielding structure on a plane in which the display substrate is located at least partially overlaps with at least one substrate light shielding structure adjacent to an edge of the display substrate. An embodiment of the present invention further provides a display device including the backlight module described above.