Refractive Layer Structure for Under-Display Camera Light Transmission
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Solution Overview
Problem
Conventional flexible display panels with polyimide substrates have low average visible light transmittance, especially in the camera area, leading to reduced image brightness and quality due to insufficient light transmission.
Innovation Solution
A flexible display panel design incorporating a refractive layer structure with a graded refractive index and a reflective layer in the transparent display area, which converges and focuses incident light onto the camera, increasing total light transmittance and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If polyimide substrate and conventional film layers are used, then the display panel achieves flexibility and basic display function, but the total light transmittance in the camera area is too low
Solution Approach 1:
The patent introduces a refractive layer structure with specifically controlled refractive indices (first refractive layer: 1.3-1.6, second refractive layer: 1.6-1.8, third refractive layer: 1.8-2.0) to optimize light transmission. By changing the optical parameters of the film layers, the total light transmittance in the camera area is increased while maintaining the flexible display structure.
Solution Approach 2:
The patent employs a composite film layer structure consisting of polyimide substrate, thin film transistor layer, organic light emitting diode layer, packaging layer, and a specialized refractive layer structure. This composite structure combines materials with different optical properties to achieve both flexibility and enhanced light transmittance for the under-display camera.
2Reliability
If multiple film layers are superposed to achieve display function, then the display panel gains comprehensive performance, but the total light transmittance decreases
Solution Approach 1:
The patent applies the local quality principle by creating a dedicated refractive layer structure in the camera area with specific optical properties (graded refractive indices from 1.3 to 2.0). This localized optimization allows the camera area to have high light transmittance while other areas of the display maintain their standard film layer structure for normal display function.
Solution Approach 2:
The refractive layer structure acts as an intermediary between the incident light and the camera sensor. It mediates the light transmission by refracting and directing light through the multiple film layers, ensuring sufficient light reaches the camera while maintaining the integrity of the display's comprehensive film layer structure.
3Illumination intensity
If conventional line arrangement is used in camera area, then the display structure is simple, but the camera receives insufficient light resulting in lower image brightness and quality
Solution Approach 1:
The patent changes the optical parameters of the camera area by introducing a refractive layer structure with graded refractive indices. This parameter change increases light transmission efficiency to the camera, improving image brightness and quality while maintaining a relatively simple overall display structure.
Solution Approach 2:
The patent applies local quality optimization specifically in the camera area by adding the refractive layer structure only where needed. This localized approach improves light transmission for the camera without unnecessarily complicating the entire display structure, maintaining simplicity in non-camera areas.
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 refractive layer structure enhances light transmission through the display panel, ensuring the camera receives sufficient light, thereby increasing image brightness and quality in under-display camera applications.
Implementation Method 1
at least one set of refractive layer structure in the transparent display area... The refractive index of the first refractive layer is lower than the refractive index of the second refractive layer. The refractive index of the second refractive layer is lower than the refractive index of the third refractive layer.
Data Source
AI summary
A flexible display panel and a display device are provided. The flexible display panel includes a display area, the display area includes a transparent display area and a non-transparent display area surrounding the transparent display area. In the display area, the flexible display panel includes a base layer structure, a thin film transistor layer, an organic light emitting diode layer, and a packaging layer. The thin film transistor layer is disposed on the base layer structure. The organic light emitting diode layer is disposed on the thin film transistor layer. The packaging layer is disposed on the organic light emitting diode layer. In the transparent display area, the flexible display further includes at least one set of refractive layer structure.