Display Device Light Conversion Sheet for Brightness Uniformity
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Solution Overview
Problem
Conventional display devices face challenges in achieving high color reproduction and brightness, particularly due to light leakage and non-uniform illumination in the peripheral regions of liquid crystal display panels.
Innovation Solution
A light conversion/light-blocking sheet is integrated along the outer peripheral portions of the optical sheets, which reflects and converts incident blue light into white light, effectively blocking and redirecting light to enhance color reproduction and brightness within the display panel's effective viewing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-illumination type backlight unit is used to supply light over the whole area of the liquid crystal display panel, then high brightness can be achieved, but the thickness must be larger to ensure brightness uniformity
Solution Approach 1:
The backlight unit is divided into multiple light sources arranged in an array configuration, with each light source illuminating a specific region. This segmentation allows for thinner overall thickness while maintaining brightness uniformity through distributed illumination.
Solution Approach 2:
Different regions of the backlight unit have different light source densities or characteristics. The light sources are selectively positioned to provide appropriate illumination intensity for each local area, enabling uniform brightness across the display panel with reduced thickness.
2Illumination intensity
If quantum dots are used to convert blue light into red light or green light for high color reproduction, then white light can be generated, but light leakage and non-uniform illumination in peripheral regions occur
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the light sources and the display panel. It distributes and redirects light to achieve uniform illumination across the entire panel, including peripheral regions, while maintaining the quantum dot color conversion functionality.
Solution Approach 2:
The light distribution problem is solved by utilizing the thickness dimension of the light guide plate. Light is introduced from the edge or specific regions and redistributed through the plate's volume to achieve uniform two-dimensional illumination across the display area.
3Illumination intensity
If the outer peripheral portions of the light guide plate are not properly managed, then light leakage occurs in peripheral regions, but adding light-blocking structures may reduce brightness in the effective display area
Solution Approach 1:
The light guide plate is designed to redirect peripheral light that would otherwise leak into the effective display area. By strategically positioning light sources and using the light guide plate's optical properties, potentially harmful peripheral light is converted into beneficial illumination for the display region.
Solution Approach 2:
Different regions of the light guide plate have different optical properties or light source densities. The peripheral regions are specifically designed to control light distribution, preventing leakage while the central regions maintain high brightness for the effective display area.
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 improves color reproduction and brightness by blocking and converting blue light leaks from peripheral regions, ensuring uniform illumination and enhanced visual performance in the display panel's effective display area.
Implementation Method 1
a quantum dot bar having a plurality of quantum dots, which can convert blue light into red light or green light
Implementation Method 2
a light conversion layer formed on the light guide plate and including a plurality of phosphors and a host material
Implementation Method 3
a reflective sheet provided under the light guide plate
Data Source
Figure 1~2
Figure 3~6
AI summary
Disclosed is a display device. The display device includes: a light source; an optical sheet into which light is incident from the light source; a display panel disposed on the optical sheet and including an effective display region and a non-effective display region around the effective display region; and a light conversion/light-blocking sheet corresponding to the non-effective display region.