Colored Layer Overlap for OLED Viewing Angle
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Solution Overview
Problem
Existing electro-optical devices using OLEDs face issues with color change due to viewing angle, particularly in the oblique direction, due to continuous colored layers in the E and F directions, leading to differing color changes between red, green, and blue.
Innovation Solution
The electro-optical device incorporates a configuration where the first and second colored layers overlap specific light-emitting regions, with the third colored layer being overlaid on the second colored layer, ensuring that the end portion of the third colored layer does not form a convex shape, thus preventing light condensing effects and improving viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If colored layers are arranged continuously in oblique directions to suppress color change in row and column directions, then color uniformity in horizontal and vertical directions is improved, but color change in oblique directions increases due to continuous colored layers
Solution Approach 1:
The colored layers are segmented into discrete regions rather than continuous structures. Specifically, the first colored layer includes a first region overlapping the first light-emitting region and a second region between the second and fourth light-emitting regions, while the third colored layer includes a third region overlapping the third light-emitting region and a fourth region between the second and fourth light-emitting regions. The second and fourth regions at least partially overlap, creating isolated colored regions that prevent continuous color transmission in oblique directions, thereby suppressing color change while maintaining color uniformity in horizontal and vertical directions.
2Use of energy by moving object
If colored layers are positioned to overlap light-emitting regions for efficient color filtering, then light transmission efficiency is improved, but viewing angle characteristics deteriorate due to convex shapes forming at layer boundaries
Solution Approach 1:
The colored layers are designed with asymmetric overlapping arrangements rather than symmetric convex shapes. The first and third colored layers are positioned to overlap specific light-emitting regions, while the second and fourth regions of these layers at least partially overlap each other. This asymmetric configuration prevents the formation of convex shapes at layer boundaries that would otherwise act as lens structures, thereby eliminating light condensing effects and improving viewing angle characteristics while maintaining efficient color filtering.
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 reduces color change differences when viewed from various angles, maintaining uniform color perception across directions, thereby enhancing the viewing angle characteristics of the device.
Implementation Method 1
a first colored layer configured to transmit the light in the first wavelength range... a second colored layer provided to overlap the second light-emitting region and configured to transmit the light in the second wavelength range
Implementation Method 2
a first light-emitting region configured to emit light in a first wavelength range... a second light-emitting region disposed adjacent to the first light-emitting region in a first direction and configured to emit light in a second wavelength range
Data Source
AI summary
An electro-optical device includes a light-emitting region B and a colored layer Cf_B, a light-emitting region G1 and a colored layer Cf_G disposed adjacent to the light-emitting region B in a Y direction, a light-emitting region R and a colored layer Cf_R disposed adjacent to the light-emitting region G1 in an X direction, and a light-emitting region G2 and a colored layer Cf_G disposed adjacent to the light-emitting region G1 in an E direction, the colored layer Cf_B includes a region Ba overlapping the light-emitting region B, and a region Bb1 located between the light-emitting region G1 and the light-emitting region G2, the colored layer Cf_R includes a region Ra overlapping the light-emitting region R, and a region Rb3 located between the light-emitting region G1 and the light-emitting region G2, and the region Bb1 and the region Rb3 at least partially overlap each other.