Display Device Light-Absorbing Layer for Sensor Visibility
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Solution Overview
Problem
Conventional display devices with transparent films under the substrate suffer from external light reflection, causing sensor modules to be visible, which compromises product reliability and visibility at various angles.
Innovation Solution
A display device structure featuring a substrate with a display area, a first non-display area, and a bending area, incorporating an external light-absorbing layer with low transmittance and a resin layer with high transmittance, along with a metal pattern and protective layers, to absorb external light and prevent sensor module visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent film is placed under the substrate, then visibility at various angles is improved, but external light reflection causes the sensor module to become visible
Solution Approach 1:
The patent applies local quality by differentiating the transmittance properties of different regions in the display device. The first region (display area) uses a transparent resin layer with high transmittance to maintain visibility, while the second region (sensor module area) uses an external light-absorbing layer with low transmittance to prevent sensor visibility. This spatial differentiation of optical properties resolves the contradiction between overall visibility and localized light reflection prevention.
Solution Approach 2:
The patent segments the display device into distinct functional regions with different optical characteristics. The display area and sensor module area are separated and treated differently: the display area maintains high transparency for visibility, while the sensor area incorporates light-absorbing materials to prevent external light reflection and sensor visibility. This segmentation allows each region to optimize its specific function without compromising the other.
2Illumination intensity
If the transmittance of the film under the substrate is increased to improve visibility, then light reflection increases and sensor module becomes visible
Solution Approach 1:
The patent implements local quality by assigning different transmittance values to different regions. The display area uses high transmittance (50-99%) resin layers to ensure visibility, while the sensor module area uses low transmittance (3-30%) external light-absorbing layers to prevent sensor visibility. This localized differentiation maintains product reliability by ensuring sensors remain invisible while preserving display visibility.
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 prevents sensor module visibility and enhances product reliability by reducing external light reflection and maintaining visibility at various angles.
Implementation Method 1
an external light-absorbing layer disposed on another surface of the substrate to correspond to the display area
Implementation Method 2
a resin layer disposed on another surface of the substrate to correspond to the display area, where the resin layer exposes at least a portion of the another surface
Data Source
AI summary
A display device includes: a substrate including a display area, a first non-display area, a second non-display area, and a bending area; a display element disposed on a surface of the substrate; a resin layer disposed on another surface of the substrate to correspond to the display area, where the resin layer exposes at least a portion of the another surface; an external light-absorbing layer disposed on the another surface exposed by the resin layer; and a first protective layer disposed on the another surface of the substrate to correspond to the first non-display area.