Aperture Length Differentiation for Uniform Light Emission
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Solution Overview
Problem
In display devices with sub-pixels divided into apertures, defects at edge apertures lead to visible black regions due to uneven light emission distances, causing visibility issues and reduced yield.
Innovation Solution
The apertures in the display device are arranged such that the central apertures are longer than those at the edge portions, ensuring equal distances between adjacent normal pixels, even when a failure occurs, thus minimizing visibility differences in non-light emitting regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the aperture area of one main pixel is simply divided equally into plural apertures, then the manufacturing process is simplified, but when there is a defect at an aperture arranged at an edge portion, the distance from an aperture at which light emission is maintained to a light emitting region of an adjacent pixel becomes long, causing a visible black dot defect
Solution Approach 1:
The patent applies local quality by differentiating the aperture lengths based on their positions. Edge apertures have a first length while central apertures have a second length that is different from the first length. This local differentiation ensures that even when a defect occurs at any aperture position, the distances between adjacent light-emitting regions remain substantially equal, preventing visible black dot defects while maintaining manufacturing simplicity.
2Reliability
If one pixel is divided into plural sub-pixels to reduce pixel defects, then the reliability against leakage paths is improved, but the light emitting area of the EL element is reduced
Solution Approach 1:
The patent changes the parameter of aperture length based on position. By setting edge apertures to have a first length and central apertures to have a second length (different from the first), the patent optimizes the light emitting area while maintaining the sub-pixel division structure for defect resistance. This parameter differentiation ensures that the distances between adjacent light-emitting regions remain equal, maximizing the effective light emitting area.
3Manufacturing precision
If apertures are arranged with equal lengths, then the manufacturing precision is improved, but the visibility of non-light emitting regions becomes uneven when defects occur at different aperture positions
Solution Approach 1:
The patent intentionally introduces asymmetry by differentiating aperture lengths based on position. Edge apertures have a first length while central apertures have a second length. This asymmetric design compensates for the positional differences of apertures, ensuring that the distances between adjacent light-emitting regions remain substantially equal regardless of which aperture has a defect, thereby achieving uniform light emission patterns.
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 arrangement maintains equal distances between adjacent normal pixels, reducing the visibility of non-light emitting regions and enhancing the display device's yield by ensuring consistent light emission patterns.
Implementation Method 1
An organic EL (Electro-Luminescence) display device does not emit light when there are foreign objects or the like in an organic EL light emitting layer.
Data Source
AI summary
A display device includes: plural sub-pixels included in a main pixel, emitting light of different colors respectively; at least three apertures arranged so as to be aligned along one direction in the sub-pixel; and an aperture defining portion defining aperture lengths so that an aperture length of an aperture other than apertures at both edge portions along the one direction is longer than an aperture length of apertures at both edge portions along the one direction in the at least three apertures.