OLED Display Light-Emitting Layer Extension for Color Reproduction
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Solution Overview
Problem
Existing OLED display devices do not meet the color reproduction range of the ITU-R BT.709 standard, requiring additional algorithms and circuits for image processing, which increases manufacturing costs and complexity.
Innovation Solution
The OLED display device extends light-emitting layers from one sub-pixel area to neighboring areas, allowing for improved color reproduction without the need for separate algorithms or additional driving circuits, by adjusting the occupied area in neighboring sub-pixel areas to meet the ITU-R BT.709 color coordinate standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting layers are formed only within respective sub-pixel areas, then manufacturing process is simple, but color reproduction range does not meet ITU-R BT.709 standard
Solution Approach 1:
The patent applies local quality by making the light-emitting layers have different spatial distributions in different sub-pixel areas. Specifically, the red light-emitting layer extends into the green sub-pixel area, the green light-emitting layer extends into the blue sub-pixel area, and the blue light-emitting layer extends into the red sub-pixel area. This asymmetric local extension allows each sub-pixel to contribute to multiple color channels, achieving ITU-R BT.709 color reproduction standards without requiring separate algorithms or additional circuits.
2Manufacturing precision
If additional algorithms and circuits are added for image processing, then color reproduction standard is met, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent implements self-service by designing the light-emitting layers to inherently provide the color mixing needed for ITU-R BT.709 compliance. The extended light-emitting layers create overlapping color emissions that naturally produce the required color coordinates, eliminating the need for additional image processing algorithms or driving circuits. The structure itself performs the color reproduction function that would otherwise require complex external processing.
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 approach enables the OLED display device to natively represent ITU-R BT.709 color coordinate values, enhancing image quality and reducing manufacturing costs by eliminating the need for complex algorithms and additional circuits.
Implementation Method 1
charges are injected into a light-emitting layer formed between a cathode electrode which is an electron injection electrode, and an anode electrode which is a hole injection electrode. The injected charges combine with holes in the light-emitting layer to form electron-hole pairs that emit light.
Data Source
AI summary
There is provided an organic light-emitting diode (OLED) display device, including: a first substrate on which a plurality of sub-pixel areas are defined; a plurality of first electrodes in the plurality of sub-pixel areas, respectively; and a plurality of light-emitting layers over the plurality of first electrodes and corresponding to the plurality of sub-pixel areas, respectively; wherein at least one of the plurality of light-emitting layers extends to a neighboring sub-pixel area among the plurality of sub-pixel areas, and has an occupied area in the neighboring sub-pixel area.