Display Panel Photosensor Area Layout for Infrared Transmission
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Solution Overview
Problem
Conventional light emitting display devices face challenges in positioning infrared sensors on the rear surface while maintaining sufficient infrared transmittance, as existing designs often compromise on light blocking and reflection layers, affecting the display's efficiency and visibility.
Innovation Solution
The design incorporates a light emitting display device with a specific structure that includes a display panel with a photosensor area on the rear surface, featuring a pixel definition layer, a cathode, a capping layer, a low reflection layer, and an encapsulation layer, where the cathode and low reflection layer have openings corresponding to the photosensor area, and a light blocking layer that overlaps with the photosensor area, allowing for improved infrared transmission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the bezel area is reduced to increase screen size, then the display area is enlarged, but the available space for positioning infrared sensors is reduced
Solution Approach 1:
The patent positions the infrared sensor on the rear surface of the display panel rather than the front bezel area. This spatial relocation to another dimension (rear surface) allows the sensor to be integrated without occupying front bezel space, thereby maintaining large screen size while providing sensor positioning capability.
Solution Approach 2:
The patent creates a photosensor area with specific local optical properties (different transmittance characteristics) on the rear surface of the display panel. This localized region with optimized optical quality enables infrared sensor functionality without affecting the overall display area or front bezel design.
2Reliability
If openings are formed in the cathode and other layers to improve infrared transmittance, then the infrared transmission is enhanced, but the device structure becomes more complex
Solution Approach 1:
The patent divides each layer (cathode, capping layer, low reflection layer, light blocking layer) into multiple regions: a first area corresponding to the display area and a second area corresponding to the photosensor area. This segmentation allows different optical properties in different regions, enabling infrared transmission through strategic openings and thickness variations without compromising display functionality.
Solution Approach 2:
The patent implements local quality by creating regions with different thicknesses and transparency characteristics. Specifically, the cathode has a first thickness in the display area and a second thickness (greater than the first) in the photosensor area, and similar variations exist in other layers. This localized optimization enhances infrared transmission where needed while maintaining display performance elsewhere.
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 configuration enhances infrared transmission over a certain level, improving the operational efficiency of the infrared sensor while maintaining the display's visibility and light blocking capabilities.
Implementation Method 1
a low reflection layer positioned on the capping layer
Data Source
AI summary
A light emitting display device includes a display panel including a display area and a photosensor area surrounded by the display area; and an infrared sensor positioned on a rear surface of the photosensor area, wherein the display area includes a pixel definition layer having an opening overlapping an anode; a cathode covering the pixel definition layer; an encapsulation layer positioned on the cathode; and a light blocking layer positioned on the encapsulation layer and having an opening overlapping the opening of the pixel definition layer, wherein the photosensor area overlaps an overlapping portion of the light blocking layer, the pixel definition layer has an additional opening corresponding to the photosensor area such that the pixel definition layer is not formed in the photosensor area, and the photosensor area further includes an additional spacer positioned within the additional opening of the pixel definition layer.