Display Device Metal Layer Slant Surface Light Leakage
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Solution Overview
Problem
Existing display devices face challenges in reducing light leakage from switching elements while allowing images to be viewed from one surface side with a background on the opposite surface, as described in Japanese Patent Application Laid-open Publication No. 2018-021974.
Innovation Solution
The display device incorporates an array substrate with signal lines and scanning lines, an organic insulating layer, and a metal layer that covers specific slant surfaces of the insulating layer to overlap the switching elements, reducing light leakage by controlling the light source emission to side surfaces of the substrates and utilizing polymer-dispersed liquid crystals for image scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source is disposed so as to be opposed to at least one of side surfaces of the first light-transmitting substrate and the second light-transmitting substrate, then light can be emitted to display images while allowing background visibility, but light leakage from switching elements occurs
Solution Approach 1:
A light-blocking layer is introduced as an intermediary component between the switching elements and the light source. This layer selectively blocks light from reaching the switching elements while allowing light to pass through to the display region, thereby preventing light leakage without compromising image display or background visibility
Solution Approach 2:
The light-blocking layer is selectively positioned only in regions where switching elements are located, rather than covering the entire substrate. This localized approach blocks light only where necessary (at switching element positions) while maintaining light transmission in the display regions, thus preventing light leakage without affecting overall display performance
2Object-generated harmful factors
If a light-blocking layer is added to reduce light leakage, then light leakage is reduced, but device complexity increases
Solution Approach 1:
The light-blocking layer is integrated with existing substrate structures, such as being formed on the same substrate as the switching elements or combined with other functional layers. This merging approach adds the light-blocking function without requiring completely separate additional components, thus reducing the increase in device complexity
Solution Approach 2:
The light-blocking layer serves multiple functions: it blocks light from reaching switching elements to prevent light leakage, maintains the structural integrity of the display device, and can be integrated with other functional layers. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity
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 effectively reduces light leakage and allows images to be displayed on one surface side while maintaining visibility of the background on the opposite surface, enhancing the display's light-transmittance and reducing flicker issues.
Implementation Method 1
utilizing polymer-dispersed liquid crystals for image scattering
Data Source
AI summary
A display device includes: an array substrate; a counter substrate; a liquid crystal layer; and a light source. The array substrate includes: signal lines arranged in a first direction; scanning lines arranged in a second direction; switching elements coupled to the scanning lines and the signal lines; an organic insulating layer covering at least the switching elements; and a metal layer overlapping the organic insulating layer. A region surrounded by the scanning lines and the signal lines has a region having a thickness less than that of the organic insulating layer. The metal layer covers a first slant surface of the organic insulating layer on a side of the organic insulating layer closer to the light source than the switching element is, and a second slant surface of the organic insulating layer on a side of the organic insulating layer farther from the light source than the switching element is.