Display Device Light Path Change Structure Prevents Pixel Crosstalk
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Solution Overview
Problem
Organic light emitting display devices, particularly in head-mounted displays, suffer from image distortion due to light spreading from one pixel to adjacent pixels, which is exacerbated by the interference between adjacent pixels.
Innovation Solution
A display device design featuring a substrate with subpixel areas, an insulating layer with recessed and convex portions, reflective electrodes, and a light path change structure on the second electrode overlapping with a bank, which redirects light to prevent it from spreading to adjacent subpixel areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional organic light emitting display device structure is used, then the device achieves self-light emission with low power consumption and fast response speed, but image distortion occurs due to light spreading from one pixel to adjacent pixels
Solution Approach 1:
A light blocking structure is introduced as an intermediary element between adjacent subpixels. This structure selectively blocks light spreading from one subpixel to adjacent subpixels, preventing image distortion while maintaining the inherent low power consumption and fast response characteristics of organic light emitting display devices
Solution Approach 2:
The display device is segmented into distinct subpixel regions with light blocking structures positioned between them. This segmentation isolates light emission from each subpixel, preventing lateral light spread to adjacent subpixels and thereby improving image clarity without affecting the overall power efficiency of the device
2Manufacturing precision
If the pixel density is increased to achieve ultra-high resolution, then the display quality improves, but light interference between adjacent pixels becomes more serious
Solution Approach 1:
Light blocking structures are positioned between adjacent subpixels to act as intermediaries that prevent light interference. This allows ultra-high resolution to be achieved by increasing pixel density without suffering from increased light interference, as each subpixel's light is contained by the blocking structures
Solution Approach 2:
The light blocking structures provide localized light containment at each subpixel boundary. This local quality control ensures that light spreading is prevented at each interface between subpixels, enabling ultra-high resolution displays where light interference would otherwise be exacerbated by the reduced spacing between pixels
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 effectively prevents image distortion and light spread by refracting or reflecting light emitted from one subpixel area to ensure it is directed correctly, enhancing image clarity and luminance in high-resolution displays.
Implementation Method 1
as the light path change structure is provided on the second electrode overlapped with the bank, a light path is changed to prevent light emitted from a subpixel area from being spread to an adjacent subpixel area
Implementation Method 2
a light path change structure arranged on the second electrode while being overlapped with the bank... refracting or reflecting light emitted from one subpixel area
Data Source
AI summary
A display device includes a substrate with a first subpixel area and a second subpixel area adjacent to one side of the first subpixel area; an insulating layer on the substrate having a first recessed portion on the first subpixel area, a second recessed portion on the second subpixel area and a convex portion between the first recessed portion and the second recessed portion; a reflective electrode on the insulating layer including first and second reflective electrodes on the first and second recessed portions, respectively; a first electrode including a first sub electrode on the first reflective electrode and a second sub electrode on the second reflective electrode; an organic light emitting layer on the first electrode; a bank provided between the first subpixel area and the second subpixel area while covering an end of the first electrode; a second electrode on the organic light emitting layer; and a light path change structure on the second electrode while being overlapping the bank.