Scattering Seal Member for Display Luminance Control
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Solution Overview
Problem
Conventional viewing-angle-controlled liquid crystal display devices often experience abnormal increases in luminance due to misalignment between the transparent/scattering state switching element and the display panel, leading to reduced display quality and increased manufacturing costs.
Innovation Solution
The implementation of a transparent/scattering state switching element with a seal member that has scattering properties equal to or greater than the switching layer, and the use of a scattering double-sided adhesive tape to reduce luminance and prevent abnormally bright areas, allowing for misalignment without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transparent/scattering state switching element is used to control viewing angles, then the ability to switch between wide and narrow viewing angles is improved, but abnormal luminance increases occur due to misalignment between the switching element and display panel
Solution Approach 1:
A seal member with light scattering properties is introduced as an intermediary between the transparent/scattering state switching element and the display panel. This seal member scatters light that would otherwise pass through misaligned regions and cause abnormal luminance increases, while not interfering with the intended viewing angle control function.
Solution Approach 2:
The misalignment that causes harmful light leakage is converted into a beneficial effect by designing the seal member to have light scattering properties. The scattering property, which could be considered a deviation from perfect transparency, is intentionally utilized to scatter stray light and prevent abnormal luminance increases in the display region.
2Illumination intensity
If high precision alignment is required between the transparent/scattering state switching element and display panel, then abnormal luminance increases are prevented, but manufacturing costs increase
Solution Approach 1:
The seal member acts as a buffer that compensates for alignment tolerances. By positioning the seal member between the switching element and display panel and giving it light scattering properties, the system becomes less sensitive to precise alignment requirements, thereby reducing manufacturing complexity and cost.
Solution Approach 2:
The optical properties of the seal member are changed from transparent to light-scattering to alter the light path behavior. This parameter change allows the system to tolerate larger alignment variations without producing abnormal luminance increases, simplifying the manufacturing process.
3Ease of manufacture
If the seal member is made transparent to allow light passage, then assembly is simplified, but abnormal luminance increases occur in misaligned regions
Solution Approach 1:
The seal member is designed with light scattering properties specifically in the regions that overlap with the display panel, while maintaining structural integrity for sealing and positioning. This localized optical property ensures that light scattering occurs only where needed to prevent abnormal luminance, without compromising the overall assembly simplicity.
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 solution effectively mitigates the issue of abnormal luminance increases, enhancing display quality and manufacturing yield while reducing manufacturing costs by allowing for less precise alignment during assembly.
Implementation Method 1
a seal member disposed between external peripheral portions of the two transparent substrates... a region in which the seal member is disposed in the transparent/scattering state switching element is not transparent, as viewed from a direction perpendicular to a surface of the display panel
Implementation Method 2
a transparent/scattering state switching layer that is capable of switching between a state for transmitting incident light and a state for scattering incident light
Data Source
AI summary
A display device is provided with a light source, an light-guide plate, a prism sheet, a transparent/scattering state switching element, and a transmissive liquid crystal display panel. In the transparent/scattering state switching element, two transparent substrates are provided parallel to and separated from each other, and an electrode is provided to the surface of each transparent substrate. A scattering seal member is also provided between external peripheral portions of the transparent substrates, and a PDLC layer is enclosed in a space sealed by the scattering seal member between the transparent substrates. The scattering seal member is endowed with scattering properties whereby incident light is transmitted in a scattered state, and the degree of scattering thereof is equal to the degree of scattering of the PDLC layer during the scattering state.