Phosphor-Color Filter Display Stack for High Luminance, Low Power
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Solution Overview
Problem
Existing display devices face challenges in achieving high luminance, contrast, response speed, low power consumption, low manufacturing cost, and long lifetime while maintaining high performance and efficiency.
Innovation Solution
A display device design incorporating a transistor, a light-emitting element, a phosphor layer, and coloring layers, where the light-emitting element emits white light, and the phosphor layer emits complementary colors to achieve high luminance and contrast, with a light-blocking layer to prevent light leakage, and using oxide semiconductors or silicon in the transistor for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-emitting element with high luminance is used, then the display device achieves high brightness, but power consumption increases
Solution Approach 1:
The patent changes the material parameters of the transistor by using oxide semiconductor films with controlled carrier concentrations. This allows the transistor to operate with lower off-state current, reducing leakage power consumption while maintaining the ability to drive high-luminance light-emitting elements efficiently during active periods.
Solution Approach 2:
The patent applies different material qualities to different regions of the transistor channel. Specifically, it uses oxide semiconductor films with varying carrier concentrations in different channel regions, optimizing local electrical characteristics to reduce overall power consumption while maintaining high luminance output.
2Speed
If oxide semiconductor films with high carrier concentration are used in the channel, then field-effect mobility increases, but off-state current increases
Solution Approach 1:
The patent divides the channel into regions with different oxide semiconductor film properties. The first channel region uses oxide semiconductor film with higher carrier concentration for high field-effect mobility, while the second channel region uses oxide semiconductor film with lower carrier concentration for low off-state current, achieving both speed and energy efficiency.
Solution Approach 2:
The patent segments the transistor channel into multiple regions with different oxide semiconductor film characteristics. This segmentation allows independent optimization of field-effect mobility in one region and off-state current control in another region, resolving the contradiction between speed and energy loss.
3Illumination intensity
If multiple layers (phosphor layer, coloring layer) are added to achieve high contrast and luminance, then display performance improves, but device complexity increases
Solution Approach 1:
The patent combines the phosphor layer and coloring layer into a integrated optical stack that works synergistically. The phosphor layer converts light wavelengths while the coloring layer filters specific color ranges, achieving high luminance and contrast through combined functionality rather than separate complex systems.
Solution Approach 2:
The patent designs the phosphor layer and coloring layer to serve multiple functions simultaneously: wavelength conversion, color filtering, and contrast enhancement. This multi-functionality reduces the need for additional separate components, maintaining relatively simple device structure while achieving superior display performance.
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
The solution enables a display device with enhanced luminance, contrast, response speed, low power consumption, and extended lifespan while being manufactured at a lower cost, offering a novel and efficient display solution.
Implementation Method 1
the phosphor layer includes a phosphor emitting light of a complementary color of an emission color of the light-emitting element
Data Source
AI summary
A display device with a high luminance, a high contrast, and low power consumption is provided. The display device includes a transistor, a light-emitting element, a coloring layer, a phosphor layer, a first electrode, and a second electrode. The light-emitting element is electrically connected to the first electrode and the second electrode, the first electrode is electrically connected to the transistor, and the second electrode is positioned on the same plane as the first electrode. The coloring layer is positioned over the light-emitting element, the phosphor layer is positioned between the light-emitting element and the coloring layer, and the phosphor layer, the light-emitting element, and the coloring layer include a region in which they overlap with one another. The light-emitting element includes a light-emitting diode chip, and the phosphor layer has a function of emitting light of a complementary color of an emission color of the light-emitting element.