Photoconversion Sheet Edge Strip for Display Light Leakage
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Solution Overview
Problem
Flat panel display devices, particularly liquid crystal displays, experience light leakage phenomena, such as blue light leakage at the display edge regions, which deteriorate display quality by causing uneven color temperature and reduced light uniformity.
Innovation Solution
A photoconversion arrangement featuring a mold frame with a strip that protrudes from the edge of the photoconversion sheet to create a step structure, incorporating a polymer matrix with light scattering and absorption layers, which helps in reducing light leakage and improving light uniformity by enhancing light circulation and conversion efficiency at the edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a quantum dot photoconversion sheet is used to convert light in flat panel display devices, then color reproduction and brightness are improved, but light leakage phenomenon occurs at the display edge region causing blue light leakage and uneven color temperature
Solution Approach 1:
The photoconversion sheet is segmented into a main body region and an edge region (strip). The edge region strip is positioned at the edge of the photoconversion sheet to specifically address light leakage in the display edge region, while the main body continues to provide overall photoconversion functionality. This segmentation allows different regions to serve different purposes: the strip controls edge light leakage while the main body maintains brightness and color reproduction.
Solution Approach 2:
Different regions of the photoconversion sheet are given different properties. The edge region strip has specific photoconversion characteristics optimized for controlling edge light leakage, while the main body region maintains the quantum dot composition for overall color reproduction. This local quality differentiation ensures that the edge region addresses the light leakage problem without compromising the overall brightness and color performance of the display.
2Stability of the object's composition
If the photoconversion sheet covers the entire display area including edge regions, then uniform light conversion is achieved, but light leakage at edges cannot be controlled and display quality deteriorates
Solution Approach 1:
The photoconversion sheet is divided into a main body region for uniform light conversion and an edge region strip for controlling light leakage. The strip is positioned at the edge with specific photoconversion properties that differ from the main body, allowing it to control edge light leakage while the main body maintains overall light uniformity and color consistency.
Solution Approach 2:
The edge region strip is given specialized photoconversion properties different from the main body region. This local quality differentiation enables the strip to specifically address light leakage at edges while the main body continues to provide uniform light conversion across the central display area, thus resolving the contradiction between overall uniformity and edge light control.
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 mitigates blue light leakage, reduces color temperature differences across the screen, and enhances display quality by ensuring uniform light distribution and maintaining the inherent color gamut of light emitting materials.
Implementation Method 1
The quantum dot provides an energy-excited state by absorbing light from an excitation source, and emits energy corresponding to the energy bandgap of the quantum dot
Implementation Method 2
The quantum dot is a semiconductor material having a crystalline structure of a several nanometer size, and may have a high surface area per unit volume due to small size thereof and may provide quantum confinement effects
Implementation Method 3
a light scattering layer including at least one selected from silica, alumina, glass, calcium carbonate (CaCO 3 ), talc, mica, aluminum oxide, barium titanate, barium carbonate, barium sulfate, zinc oxide (ZnO), cerium oxide, titanium oxide, zirconium oxide (ZrO 2 ), aluminum hydroxide and magnesium oxide (MgO)
Implementation Method 4
a light absorption layer including a polymer layer including carbon black, a black dye, a black pigment, iron oxide, copper oxide, tin oxide or a mixture thereof
Data Source
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Figure 3
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AI summary
Disclosed is a mold frame including a guide defining the position of a photoconversion layer and at least one of optical sheets disposed on the photoconversion layer, a backlight unit and a liquid crystal display including the same, and the like. The first guide includes a first surface facing the liquid crystal panel, a second surface opposite to the first surface, and a third surface extended from the edge of the first surface to the edge of second surface, wherein at least a portion of the second surface is provided with a strip, and wherein the strip is extended along the edge of the optical sheet or the photoconversion layer to overlap a region adjacent to the edge of the top surface of the optical sheet or adjacent to the edge of the top surface of the photoconversion layer.