Display Device Light Source Reducing Chromaticity Deviation
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Solution Overview
Problem
Display devices face challenges in maintaining image quality and reducing power consumption while minimizing luminance and color irregularities, particularly in edge light type light source devices where chromaticity deviation occurs due to wavelength-dependent optical characteristics in light conversion sections.
Innovation Solution
A display device incorporating a light source device with a light emission section, a light conversion section using a polymer dispersed liquid crystal layer, and a white light conversion section that converts incident blue or ultraviolet light to white light, optimizing the dominant wavelength and half-value width of the incident light to reduce chromaticity deviation and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If partial drive is implemented in edge light type light source device, then power consumption is reduced and high-contrast image is achieved, but luminance irregularity and color irregularity occur
Solution Approach 1:
The light guide plate is divided into multiple light emission regions (first light emission region and second light emission region) with different luminance characteristics. This segmentation allows independent control of different regions to achieve uniform overall luminance while enabling partial drive for power savings.
Solution Approach 2:
Different regions of the light guide plate are designed with different luminance properties - the first light emission region has higher luminance than the second light emission region. This local quality differentiation compensates for the non-uniform light distribution inherent in edge light type devices, enabling uniform perceived luminance across the display.
2Illumination intensity
If white light is introduced into light guide plate for partial drive, then high-contrast image is achieved, but chromaticity deviation occurs due to wavelength-dependent optical characteristics
Solution Approach 1:
The patent optimizes the dominant wavelength and half-value width parameters of the incident blue light to specific ranges (dominant wavelength: 440-470nm, half-value width: 80-120nm). This parameter control ensures that the wavelength-dependent optical characteristics of the light conversion section produce uniform chromaticity across different light emission regions while maintaining high contrast.
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 effectively suppresses chromaticity deviation and image quality degradation by carefully selecting the wavelength and intensity of the incident light, resulting in improved display performance and reduced power consumption.
Implementation Method 1
a light conversion section which receives the incident light and which converts intensity of the incident light, and a white light conversion section which converts the incident light with the converted intensity to white light
Data Source
AI summary
A display device includes a light source device including a light emission section which emits incident light, a light conversion section which receives the incident light and which converts the intensity of the incident light, and a white light conversion section which converts the light with the converted intensity to white light. With the light source device light emitted from the light conversion section is converted to white light by the white light conversion section. As a result, white light in which chromaticity deviation is reduced is used as a light source. With a display device in which white light is used as backlight light, image quality degradation is reduced.