Divided Pixel Display 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 divided pixels with a reflective electrode, counter electrode, color filter, and an inorganic light emitter on the counter electrode side, which enables area coverage modulation and light emission to increase the number of color gradations by combining area coverage modulation with light emission control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If area coverage modulation is used to express color gradations, then the device can display colors by adjusting pixel area, but the number of arrangeable pixels is limited resulting in insufficient color gradations
Solution Approach 1:
The pixel is divided into multiple sub-pixels that can be independently controlled. By segmenting the pixel structure into reflective electrode regions and inorganic light emitter regions, the system can achieve finer gradation control through selective activation of sub-regions, thereby increasing the number of expressible color gradations without requiring a larger total pixel count.
Solution Approach 2:
The invention merges two different light generation mechanisms (reflective electrode reflecting external light and inorganic light emitter generating light) within the same pixel structure. This combination allows the system to achieve multiple gradation levels by controlling the intensity and area of each light source, effectively multiplying the number of achievable color gradations beyond what either mechanism could provide alone.
2Quantity of substance
If the number of pixels is increased to improve color gradations, then more color steps can be expressed, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The system employs dynamic control of light emission intensity and duration for both the reflective electrode and inorganic light emitter. By dynamically adjusting the activation area and intensity of each component, the system can express multiple color gradations using the same physical pixel structure, eliminating the need to increase pixel count and thereby reducing device complexity.
Solution Approach 2:
The invention changes the operational parameters (intensity, area, duration) of the light-emitting components within each pixel to achieve different color gradations. Instead of increasing the number of pixels, the system varies parameters such as the illuminated area ratio and emission intensity to create fine gradation control, simplifying the overall device structure.
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 achievable through inorganic light emission, resulting in a wider color space and improved color representation.
Implementation Method 1
an inorganic light emitter provided on the counter electrode side of the color filter, and configured to emit light
Implementation Method 2
a color filter provided on a side of the counter electrode opposite to a side of the counter electrode facing the reflective electrode
Implementation Method 3
each comprising a reflective electrode
Data Source
AI summary
A display device includes a plurality of divided pixels each comprising a reflective electrode, a counter electrode provided so as to face the reflective electrode, a color filter provided on a side of the counter electrode opposite to a side of the counter electrode facing 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 the counter electrode side of the color filter, and configured to emit light.