Subpixel Partition Wall Layout for Lower-Power Light Emitting Displays
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Solution Overview
Problem
Light emitting display devices with tandem structures face high power consumption due to all light emitting stacks emitting light simultaneously.
Innovation Solution
The device includes a substrate with subpixels of different colors, separated by partition walls with protrusion portions, and a connection electrode, where light emitting stacks and charge generation layers are separated, allowing individual control of light emission in each subpixel, reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all light emitting stacks in subpixels emit light simultaneously to generate white color, then the display device achieves full-color display capability, but power consumption increases
Solution Approach 1:
The light emitting stacks are segmented into first and second stacks that can be independently controlled. The partition wall divides the subpixels into first and second regions, allowing selective activation of specific light emitting stacks based on display requirements, thereby reducing overall power consumption while maintaining color display capability.
Solution Approach 2:
The system dynamically controls which light emitting stacks are activated based on the display needs. Instead of all stacks emitting simultaneously, the control circuit selectively activates only the necessary stacks (either first or second region) depending on the required color output, making the system adaptable and energy-efficient.
2Reliability
If partition walls completely separate light emitting stacks between adjacent subpixels, then color crosstalk is reduced, but manufacturing complexity increases due to multiple protrusion portions
Solution Approach 1:
The partition wall is extended into the vertical dimension with multiple protrusion portions (first, second, and third protrusion portions at different heights). This three-dimensional structure achieves complete separation of light emitting stacks between adjacent subpixels while maintaining a compact footprint, balancing separation effectiveness with manufacturing feasibility.
Solution Approach 2:
The partition wall structure uses nested protrusion portions where smaller protrusions are positioned within or alongside larger ones at different vertical levels. This nested arrangement achieves comprehensive separation through multiple layers, ensuring color isolation while optimizing the use of vertical space.
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 power consumption by enabling individual light emission control in each subpixel, minimizing the need for color filters and lowering material costs.
Implementation Method 1
a light emitting display device including a light emitting element such as a light emitting diode is a display device in which charges are injected into a light emitting layer formed between an anode and a cathode to form pairs of electrons and holes, and then the pairs disappear to emit light
Data Source
AI summary
A light emitting display device includes: first to third subpixels of different colors; a partition wall of an overhang structure along a boundary between the first subpixel and the second and third subpixels, and including a protrusion portion; a connection electrode under the protrusion portion at the boundary of the first subpixel; first and second light emitting stacks, a charge generation layer, and a second electrode separated by the partitional wall; and an intermediate electrode separated by the partition wall and in the first subpixel, located between the charge generation layer and the second light emitting stack in the first subpixel, and connected to the connection electrode, wherein the second light emitting stack emits a color of the first subpixel, and the first light emitting stack emits a mixed color of colors of the second and third subpixels. The present invention can reduce a power consumption and a material cost of a color filter pattern.