Variable Color Sub-Pixel for Display Color Gamut Conversion
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Solution Overview
Problem
RGBW pixel arrangement in liquid crystal display technology compromises picture display fineness, color purity, and color gamut due to the addition of white pixels, particularly in high-resolution and large-size displays, necessitating a solution that maintains high transmittance without reducing these optical properties.
Innovation Solution
Incorporating variable color sub-pixels with photoluminescent materials and micro LEDs, along with a liquid crystal panel for exciting light selection, to emit light of predetermined colors, allowing for adjustable color gamut conversion and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If RGBW pixel arrangement is used to improve transmittance, then transmittance is improved, but color purity and color gamut are reduced
Solution Approach 1:
The patent applies dynamics by making the fourth sub-pixel's color variable rather than fixed. The fourth sub-pixel can dynamically change its emission color (red, green, blue, or yellow) based on excitation wavelength, allowing the display to adapt between high transmittance mode (yellow emission) and high color purity mode (RGB emission), thus resolving the contradiction between transmittance and color purity
Solution Approach 2:
The patent uses composite materials by combining photoluminescent materials with different emission characteristics in the fourth sub-pixel. The fourth sub-pixel contains photoluminescent material that can be excited by multiple wavelengths to produce different colors, effectively combining the advantages of both high transmittance (yellow emission) and high color purity (RGB emission) in a single pixel structure
2Illumination intensity
If RGBW pixel arrangement is used to improve transmittance, then transmittance is improved, but picture display fineness is reduced
Solution Approach 1:
The variable color capability of the fourth sub-pixel allows dynamic optimization of picture display fineness. When high fineness is required, the fourth sub-pixel can emit RGB colors to match traditional displays. When high transmittance is prioritized, it emits yellow light, enabling the system to adapt between these two requirements
3Ease of manufacture
If variable color sub-pixels with photoluminescent materials and micro LEDs are incorporated, then color gamut and picture display fineness are improved, but device complexity increases
Solution Approach 1:
The fourth sub-pixel serves multiple functions: it can emit yellow light for high transmittance, and emit RGB lights for high color gamut and picture display fineness. This multi-functionality reduces the need for separate pixel structures for different display modes, thereby limiting the increase in device complexity
Solution Approach 2:
The patent merges the functions of multiple sub-pixels into a single variable color sub-pixel. Instead of having separate yellow, red, green, and blue sub-pixels, the fourth sub-pixel can dynamically become any of these colors through photoluminescent material excitation, simplifying the overall pixel structure while maintaining enhanced color gamut capabilities
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 enhances picture display fineness, color purity, and color gamut while maintaining high transmittance, enabling the display device to meet various color gamut standards without reducing optical properties, thus addressing the limitations of traditional RGBW pixel arrangements.
Implementation Method 1
the variable color sub-pixels include a photoluminescent material, and the exciting light emitting unit is used for emitting at least one kind of exciting light to excite the photoluminescent material to emit the light of the at least one predetermined color
Implementation Method 2
the exciting light selecting unit is used for selecting the exciting light according to the light of the at least one predetermined color
Data Source
AI summary
The present disclosure provides a display device and a manufacturing method thereof and a method for converting a color gamut of a display device. The display device comprises a display panel which comprises a display substrate and a plurality of pixel units arranged on a first surface of the display substrate, wherein each pixel unit comprises a plurality of sub-pixels which comprises a variable color sub-pixel used for emitting light of at least one predetermined color according to a predetermined color gamut. Thus, the light of the predetermined color emitted by the variable color sub-pixels can alleviate the phenomenon of color shift of the display device and thereby improve multiple optical properties of the display device, and the display device can meet the requirements of different color gamuts, while not causing lowering of the optical properties.