Through Holes in Flexible Display Layers for Sensor Light Transmission
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Solution Overview
Problem
Conventional flexible display screens suffer from poor transparency due to light absorption, reflection, and scattering by inorganic and organic layers, which affects the performance of sensors and overall display functionality.
Innovation Solution
The display panel design includes a substrate with a driving circuit layer, planarization layer, pixel electrode layer, pixel definition layer, light-emitting material layer, and common electrode layer, featuring through holes in electronic element setup regions to minimize light interference, allowing external light to pass through without significant loss, using light-absorbing organic materials in certain layers and a light-shielding layer to prevent unwanted light from reaching electronic elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic films and organic layers are used in conventional flexible display screens, then the display structure is formed and functions are achieved, but light is absorbed, reflected, refracted, and scattered, causing loss of light and poor transparency
Solution Approach 1:
The patent divides the display structure into multiple functional layers (substrate, blocking layer, buffer layer, active layer, gate insulating layers, metal layers, interlayer insulating layer, source-and-drain electrode layer, planarization layer, anode layer, pixel definition layer, light-emitting layer, cathode layer, encapsulation layer) and introduces through-holes in specific layers to segment the light path, allowing light to pass through without interacting with all layers, thereby reducing light absorption and scattering while maintaining display functionality
Solution Approach 2:
The patent applies different properties to different regions of the display structure by creating through-holes only in specific layers (pixel definition layer, planarization layer, common electrode layer) at specific locations (electronic element setup region), allowing light to pass through these localized regions while other regions maintain their light-absorbing and light-blocking properties for normal display operation
2Adaptability or versatility
If sensors are disposed at the back of flexible display screens, then automatic on/off function is achieved, but light transmission is affected by the multiple layers, degrading sensor performance
Solution Approach 1:
The patent prepares the light path in advance by creating through-holes in the display layers at the electronic element setup region before light needs to pass through to the sensor. This preliminary structural preparation ensures that when the sensor needs to detect light (for automatic on/off function), the light path is already optimized for transmission, allowing the sensor to receive sufficient light without being degraded by multiple layer interactions
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
This design enhances light transparency by ensuring that external light can pass through the display panel without being absorbed or reflected by the layers, thereby improving the performance of sensors and the overall display functionality.
Implementation Method 1
Light transmitted from the outside of the encapsulation layer is absorbed, reflected, refracted, and scattered by inorganic films and organic layers
Implementation Method 2
a material of the pixel definition layer includes a light-absorbing organic material; a material of the planarization layer includes a light-absorbing organic material
Data Source
AI summary
A display panel and a display device are provided. Through disposing the through hole in at least one of the driving circuit layer, the planarization layer, the pixel definition layer, and the common electrode layer of the display panel and in the electronic element setup region disposed corresponding to the electronic elements, external light may directly pass through a layer of film having the through hole when passing through the display panel. Light transparency is thus improved, and the technical problem that poor transparency exists in conventional flexible display screens is solved.