Protective Layer Thickness Layout for Under-Display Light Transmission
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Solution Overview
Problem
Display devices face challenges in achieving high light transmittance in display regions where electronic modules are integrated, leading to reduced operating reliability due to limited light transmission through the protective layers and pixel structures.
Innovation Solution
A display device design featuring a substrate with a first and second display region, where the pixel layer includes transmission regions overlapping the first display region with a protective layer having varying thicknesses and recesses, allowing for increased light transmittance and improved integration of electronic modules by optimizing the protective layer's structure to enhance light passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is provided below the substrate to protect electronic modules, then the protection capability is improved, but the light transmittance to the electronic module is reduced
Solution Approach 1:
The protective layer is designed with spatially varying thickness: a first thickness in a first region (where electronic modules are located) and a second thickness in a second region (display region), where the first thickness is less than the second thickness. This local differentiation allows the protective layer to provide adequate protection in non-critical areas while minimizing light attenuation in regions requiring high transmittance for electronic module operation.
Solution Approach 2:
Instead of varying the in-plane area or composition of the protective layer, the invention exploits the thickness dimension (z-direction) to achieve the dual objective. By controlling the thickness distribution through recess formation, the design optimizes both protection (sufficient material presence) and light transmission (reduced material path length) without compromising the protective function.
2Strength
If the protective layer thickness is increased to improve protection, then the protection capability is improved, but the light transmittance is reduced
Solution Approach 1:
The protective layer thickness is locally optimized: thicker in regions where mechanical protection is prioritized (second region/display area) and thinner in regions where optical transmission is critical (first region/electronic module area). This spatially differentiated thickness distribution resolves the contradiction between protection strength and light transmittance by applying appropriate thickness only where each function is needed.
Solution Approach 2:
The invention changes the thickness parameter of the protective layer from a uniform value to a spatially variable value. By forming recesses that reduce thickness in specific regions, the design achieves optimal balance between protection (maintained through sufficient thickness elsewhere) and light transmission (improved through reduced thickness in critical paths).
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 design achieves higher light transmittance in the first display region compared to the second, thereby improving the operating reliability of electronic modules by ensuring more light reaches them, which is crucial for stable operation.
Implementation Method 1
a first part in the first display region, and a second part in the second display region. The first part may have a thickness less than a thickness of the second part
Data Source
AI summary
Disclosed is a display device that includes a substrate including a first display region and a second display region adjacent to the first display region, a pixel layer disposed on the substrate and including transmission regions that overlap the first display region, and a protective layer below the substrate. The protective layer includes a first part below the first display region and a second part below the second display region. The first part has a thickness less than a thickness of the second part.