Display Device Pixel Light Emitting Receiving Area Arrangement
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Solution Overview
Problem
Current display devices face challenges in achieving superior sensitivity and high resolution for external input detection, particularly in the arrangement and spacing of light emitting and receiving areas, which affects their ability to accurately sense user inputs such as fingerprints.
Innovation Solution
The display device incorporates a specific arrangement of light emitting and receiving areas, with a 2:1 ratio of green light emitting areas to light receiving areas, where the distances between these areas are optimized between 10 to 40 micrometers to enhance sensitivity and resolution, and the use of sub-resonance auxiliary layers simplifies the manufacturing process by allowing simultaneous deposition through a single mask.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between light emitting areas and light receiving areas is reduced to improve resolution, then measurement precision is improved, but sensitivity deteriorates
Solution Approach 1:
The pixel is divided into multiple light emitting areas (first, second, third, fourth light emitting areas) and light receiving areas arranged in specific rows and columns. This segmentation allows each area to be optimally positioned for its function while maintaining overall high resolution through the divided structure.
Solution Approach 2:
The patent arranges light emitting areas and light receiving areas in multiple dimensions (rows and columns) rather than a single linear arrangement. The first and second rows are spaced apart in a second direction perpendicular to the first direction, creating a two-dimensional configuration that simultaneously achieves close spacing for resolution and optimal light path geometry for sensitivity.
2Manufacturing precision
If multiple masks are used to form light emitting and receiving areas with precise spacing, then manufacturing precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the formation of multiple light emitting areas and light receiving areas into a single mask process. The mask simultaneously defines all light emitting areas (first, second, third, fourth) and light receiving areas, eliminating the need for multiple sequential masking steps and reducing manufacturing complexity while maintaining precise spacing.
Solution Approach 2:
The single mask serves multiple functions: it defines the boundaries of all light emitting areas, all light receiving areas, and establishes the precise spacing relationships between them. This multi-functional approach to the mask reduces the total number of masking operations required.
3Measurement precision
If light emitting areas and light receiving areas are closely spaced to improve resolution, then measurement precision is improved, but light interference and cross-talk increase
Solution Approach 1:
The patent assigns different spatial positions and orientations to different light emitting areas and light receiving areas. The first light emitting area is spaced from the second light emitting area by a first distance, while the third and fourth light emitting areas are spaced by a second distance. This local differentiation in spacing and arrangement reduces cross-talk while maintaining overall high resolution.
Solution Approach 2:
By arranging light emitting areas and light receiving areas in a two-dimensional grid with rows spaced in a direction perpendicular to the column direction, the patent creates spatial separation in multiple dimensions. This multi-dimensional arrangement reduces direct light interference between adjacent areas while maintaining close overall spacing for high resolution.
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 improves the display device's sensitivity and resolution for external input detection, while reducing the number of masks needed in the manufacturing process, thereby enhancing efficiency and maintaining high aperture ratios.
Implementation Method 1
a first light emitting area emitting a first light, and a second light emitting area spaced apart from the first light emitting area by a first distance in the first direction and emitting a second light
Implementation Method 2
a light receiving area, a third light emitting area emitting a third light, and a fourth light emitting area emitting the third light
Data Source
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AI summary
A display device includes first and second unit pixels adjacent to each other in a first direction. Each of the first and second unit pixels includes a first group disposed in a first row and a second group disposed in a second row spaced apart from the first row. The first group includes a first light emitting area emitting a first light, and a second light emitting area emitting a second light. The second group includes a light receiving area and third and fourth light emitting areas spaced apart from each other with the light receiving area interposed therebetween and emitting the third light. The fourth light emitting area of the first unit pixel and the third light emitting area of the second unit pixel are spaced apart from each other by a distance from about 25 micrometers to about 100 micrometers in the first direction.