Display Panel Shading Structure for Under-Screen Camera Light Leakage
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Solution Overview
Problem
In under-screen camera technology, the non-display area around a camera through hole is widened due to fitting errors and the need for a larger frame width to block light leakage, exacerbated by the thickness of polarizers and touch functional layers.
Innovation Solution
A display panel design with a composite functional layer including a first shading layer that overlaps with the non-display area, formed using photolithography for precision, and a cover plate adhered with an adhesive layer, reducing the need for a wider frame by precise shading and light blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a larger frame width is reserved around the through hole to accommodate fitting errors and block light leakage, then light leakage prevention is improved, but the non-display area increases and display area is reduced
Solution Approach 1:
The patent introduces a vertically stacked shading layer structure within the existing frame width, transitioning from a horizontal expansion approach to a vertical layering approach. The first shading layer is positioned between the touch functional layer and the light-emitting layer, while the second shading layer is located between the cover plate and the light-emitting layer, effectively utilizing the vertical dimension to block light leakage without increasing the horizontal frame width.
Solution Approach 2:
The shading function is divided into multiple segments: the first shading layer and the second shading layer are positioned at different vertical locations to provide comprehensive light blocking. This segmentation allows each layer to address specific light leakage paths, with the first shading layer handling light from the touch functional layer side and the second shading layer handling light from the cover plate side.
2Area of stationary object
If the non-display area is reduced to increase display area, then display area is improved, but fitting errors cause misalignment and light leakage increases
Solution Approach 1:
The patent incorporates compensation structures that anticipate and accommodate fitting errors before they cause misalignment. The shading layers are designed with dimensions and positions that pre-compensate for expected variations in assembly alignment, ensuring that light leakage is blocked even when fitting errors occur during manufacturing and assembly.
Solution Approach 2:
The patent adjusts the dimensions and positions of the shading layers to account for fitting errors. The first shading layer and second shading layer are designed with specific thicknesses and lateral dimensions that compensate for alignment variations, allowing the system to maintain effective light blocking despite manufacturing tolerances and assembly variations.
3Adaptability or versatility
If thicker polarizer and touch functional layers are used to improve functionality, then functional performance is improved, but light leakage increases through the non-display area
Solution Approach 1:
The patent introduces shading layers as intermediary structures between the thick functional layers (touch functional layer and cover plate) and the light-emitting layer. These shading layers act as mediators that block light leakage paths created by the thick functional layers without compromising their functional performance, effectively separating the light blocking function from the functional layers.
4Object-affected harmful factors
If a wider frame is reserved to block light leakage, then light leakage prevention is improved, but frame width increases and display panel design efficiency decreases
Solution Approach 1:
The patent resolves the contradiction by shifting the light blocking strategy from horizontal expansion (wider frame) to vertical layering (multiple shading layers). This dimensional transition maintains a compact frame width while achieving effective light leakage prevention through the vertically stacked first and second shading layers, thereby preserving design efficiency.
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
The solution effectively minimizes the non-display area, reducing light leakage and frame width, while maintaining precise alignment and shading, thus enhancing display panel design efficiency.
Implementation Method 1
the composite functional layer includes a first shading layer, and an orthographic projection of the first shading layer on the array substrate is located in the non-display area of the array substrate
Implementation Method 2
formed using photolithography for precision
Data Source
AI summary
A display panel includes an array substrate, a composite functional layer, a first adhesive layer and a cover plate. The composite functional layer is located on a side of the light-emitting layer away from the base substrate. A through hole penetrating through the composite functional layer and the array substrate is formed on the array substrate and the composite functional layer. The array substrate includes a non-display area surrounding the through hole. The composite functional layer includes a first shading layer, and the orthographic projection of the first shading layer on the array substrate is located in the non-display area of the array substrate. The first adhesive layer is located on a side of the composite functional layer away from the base substrate. The cover plate is located on a side of the first adhesive layer away from the base substrate.