Multilayer Display Pixel Structure for Expanded Color Gradation
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Solution Overview
Problem
Memory-in-pixel (MIP) display devices have insufficient color gradations due to limited number of arrangeable pixels, which restricts the expression of colors.
Innovation Solution
Incorporating a plurality of divided pixels with a reflective electrode, counter electrode, and an inorganic light emitter on the counter electrode side, allowing for area coverage modulation and light emission to increase color gradations by combining area coverage modulation with light emission control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If area coverage modulation is used to express color gradations by adjusting the number of pixels, then the device structure remains simple, but the number of expressible color gradations is insufficient
Solution Approach 1:
The patent combines area coverage modulation with light emission control by integrating inorganic light emitters into the pixel structure. Each pixel can independently control both the area of pixel display and the emission of light, creating a multiplicative effect on color gradations. This merging of two control mechanisms (area and light emission) resolves the contradiction by achieving high color gradation count without requiring an excessive increase in pixel density.
Solution Approach 2:
The pixel structure is designed to perform multiple functions: it serves as both a display element for area coverage modulation and as a light source through the integrated inorganic light emitter. This multi-functionality allows the same pixel structure to control both spatial area and light intensity, thereby increasing color gradations without adding separate dedicated components for each function.
2Quantity of substance
If the number of pixels is increased to achieve more color gradations, then the number of color gradations increases, but the device complexity increases
Solution Approach 1:
Instead of increasing pixel count, the patent changes the control parameters by introducing light emission intensity as an additional dimension. Each pixel's state is defined by two parameters: display area and light emission intensity. This parameter change allows the system to achieve more gradations (product of area gradations and light emission gradations) without increasing the number of pixels, thus avoiding the complexity associated with higher pixel density.
3Quantity of substance
If inorganic light emitters are added to each pixel to increase color gradations, then the number of color gradations increases, but the device complexity increases
Solution Approach 1:
The patent segments the light emission function at the pixel level by integrating individual inorganic light emitters into each pixel. This segmentation allows independent control of light emission for each pixel, enabling fine-grained control over color gradations. By distributing the light emission function across multiple small emitters rather than using a single backlight, the system achieves high color gradation capability while maintaining manageable device complexity through modular pixel design.
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 significantly enhances the number of expressible color gradations by multiplying the gradations achieved through area coverage modulation with those attainable through inorganic light emission, thereby improving color expression and display quality.
Implementation Method 1
an inorganic light emitter provided on a side of the counter electrode opposite to a side of the counter electrode facing the reflective electrode, and configured to emit light toward the divided pixel
Data Source
AI summary
A display device includes a plurality of divided pixels, each of which comprising a reflective electrode, a counter electrode provided so as to face the reflective electrode, and a holding unit configured to hold a potential corresponding to an expression of a gradation, and an inorganic light emitter provided on a side of the counter electrode opposite to a side of the counter electrode facing the reflective electrode, and configured to emit light toward the divided pixel.