Display Device Light Control Layer Alignment Mark Recognition
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Solution Overview
Problem
Display devices, particularly those in vehicles, face challenges in controlling the viewing angle of images to prevent interference with drivers and ensuring privacy, while also requiring improved alignment accuracy during the bonding process.
Innovation Solution
A display device design incorporating a light emitting element layer, a light control layer with alternating light-transmitting and light-shielding films, and a light-shielding film removal area that overlaps alignment marks, enhancing recognition and alignment accuracy through increased light transmittance and strategic placement of these features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding film is continuously disposed across the light control layer, then viewing angle control and privacy protection are improved, but alignment mark recognition deteriorates
Solution Approach 1:
The light-shielding film is segmented into multiple sections with a light-shielding film removal area (exposed area) positioned at a non-display area. This segmentation allows the film to maintain its light-shielding function in display areas while creating an opening that exposes the alignment mark for recognition during the bonding process, thus resolving the contradiction between viewing angle control and alignment mark recognition.
Solution Approach 2:
The light-shielding film removal area acts as an intermediary element that mediates between the conflicting requirements. By strategically positioning this removal area at a non-display area, it serves as both a light-shielding barrier for viewing angle control and an exposure window for alignment mark recognition, enabling both functions to coexist without interference.
2Object-affected harmful factors
If alignment marks are disposed under continuous light-shielding film, then privacy protection is improved, but alignment accuracy during bonding deteriorates
Solution Approach 1:
The light-shielding film is divided into multiple sections with a specific removal area that exposes the alignment mark. This segmentation maintains privacy protection through continuous light-shielding in display areas while creating a localized exposure zone that enables precise alignment mark recognition during bonding operations.
Solution Approach 2:
The light control layer exhibits different properties in different areas: the light-shielding film provides privacy protection in display areas, while the light-shielding film removal area at the non-display area provides local transparency for alignment mark recognition. This local differentiation resolves the contradiction between privacy protection and alignment accuracy.
3Measurement precision
If light-transmitting film width is increased in the light-shielding film removal area, then alignment mark recognition is improved, but light control performance in display area may deteriorate
Solution Approach 1:
The light-transmitting film width is increased specifically in the light-shielding film removal area at the non-display area, while the display area maintains its original light control configuration. This localized modification improves alignment mark recognition without affecting the light control performance in the display area, as the two areas are spatially separated and functionally independent.
Solution Approach 2:
The light control layer is segmented into display area and non-display area with different structural characteristics. The light-transmitting film width modification is applied only to the non-display area's light-shielding film removal area, allowing independent optimization of alignment mark recognition without compromising display area performance.
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 controls the viewing angle of display devices and improves alignment accuracy during bonding, addressing the issues of driver interference and privacy protection.
Implementation Method 1
the light control layer including a light-transmitting film and a light-shielding film... the light-transmitting film and the light-shielding film alternate with each other
Implementation Method 2
the light control layer including a light-transmitting film and a light-shielding film... it is necessary to control a viewing angle of the image displayed on the display device
Data Source
AI summary
A display device includes a light emitting element layer on a substrate, a light control layer on the light emitting element layer, the light control layer including a light-transmitting film and a light-shielding film, and a first alignment mark between the substrate and the light control layer, the light-transmitting film and the light-shielding film alternate with each other, the light control layer includes a light-shielding film removal area in which the light-shielding film is not disposed, and the light-shielding film removal area overlaps the first alignment mark.