Phosphor Color-Conversion Display Layout for High Luminance Contrast
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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 or complementary colors, and a light-blocking layer is used to inhibit light leakage and color mixing, with the phosphor layer exciting light to produce white light, enabling efficient color display with low power consumption and high luminance.
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 light-emitting element is divided into multiple light-emitting regions (first, second, third light-emitting regions) that can be independently controlled. This segmentation allows the display device to activate only the necessary regions for the current display content, reducing overall power consumption while maintaining high luminance in active areas.
Solution Approach 2:
The patent employs pulse-width modulation (PWM) to control the light-emitting elements by periodically switching them on and off at different duty cycles. This periodic action enables precise control of perceived brightness without proportionally increasing power consumption, as the elements operate at full luminance only during the on-periods.
2Reliability
If multiple coloring layers are added to achieve high contrast and color accuracy, then display quality improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple coloring layers (first coloring layer with first color, second coloring layer with second color, third coloring layer with third color) into a single integrated light-emitting element structure. This merging approach achieves high contrast and color accuracy without requiring separate display layers for each color, thereby reducing overall device complexity.
Solution Approach 2:
Each light-emitting element is designed to perform multiple functions: it generates light, provides color through integrated coloring layers, and enables contrast control through independent regional control. This multi-functionality eliminates the need for separate components for each function, reducing device complexity while maintaining high contrast performance.
3Illumination intensity
If the light-emitting element structure is optimized for high luminance, then brightness performance improves, but manufacturing precision requirements increase
Solution Approach 1:
The light-emitting element is segmented into multiple regions with different coloring layers, where each region can be independently optimized and manufactured. This segmentation allows for modular manufacturing processes with relaxed alignment requirements compared to creating a perfectly uniform multi-color structure, as each segment can be processed separately and then assembled.
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 provides a display device with enhanced luminance, contrast, and response speed while reducing power consumption and manufacturing costs, achieving a balance between performance and efficiency.
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.