Display Device Cavity for Camera Light Transmittance
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Solution Overview
Problem
Display devices face challenges in optimizing the arrangement of components like cameras and sensors within the display area to achieve high light transmittance for smooth operation, while also maintaining the display's functionality and optical characteristics.
Innovation Solution
The display device incorporates a lower and upper substrate with a display layer, featuring a first hole and groove structure that creates a cavity with a height of 10 μm to 50 μm, allowing for high light transmittance and accommodating components like cameras and sensors, while the substrates are made of materials such as silicon oxide, magnesium oxide, and zinc oxide, and an input sensing layer is integrated for touch functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a component (camera, sensor) is arranged inside the display area, then the functionality of the display device is enhanced, but the light transmittance at the component arrangement position may be reduced
Solution Approach 1:
The patent embeds the component (camera or sensor) within a cavity formed inside the display device structure. The cavity is created by forming grooves in both the lower and upper substrates, allowing the component to be nested within the display area without blocking light paths. This nesting approach enables the component to be integrated while maintaining high light transmittance in the display area.
Solution Approach 2:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional cavity structure. By forming grooves in both substrates and creating a vertical cavity space, the component can be positioned in the third dimension (depth) rather than occupying horizontal display area. This dimensional change allows light to pass through the display area unobstructed while the component resides in the vertical space.
2Area of stationary object
If the display area is increased, then the display functionality is improved, but the space for arranging components is reduced
Solution Approach 1:
The patent utilizes the vertical dimension by forming grooves in both the lower and upper substrates to create a cavity. This allows component accommodation in the depth direction rather than consuming horizontal display area, thereby enabling both large display area and adequate component space.
Solution Approach 2:
The component is nested within the cavity formed by grooves in both substrates. This nesting structure allows the component to be housed within the display device volume without reducing the display area, as the cavity uses the vertical space between substrates.
3Illumination intensity
If grooves are formed in both lower and upper substrates to create a cavity, then light transmittance and component accommodation are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent divides the groove formation process into two separate segments: one groove in the lower substrate and another groove in the upper substrate. This segmentation allows each groove to be formed independently using standard photolithography and etching processes, making the manufacturing relatively simple despite creating a three-dimensional cavity structure.
Solution Approach 2:
The grooves in both substrates are formed before assembling the display device. This preliminary action allows the cavity structure to be pre-prepared in each substrate, simplifying the final assembly process and enabling standard bonding procedures to be used without requiring complex post-assembly modifications.
Data Source
AI summary
A display device includes: a lower substrate including a first area, and a second area surrounding the first area; a display layer including a plurality of display elements at the second area, and having a first hole corresponding to the first area; and an upper substrate covering the display layer. The upper substrate includes a lower surface facing the lower substrate, and the lower surface of the upper substrate has a first groove corresponding to the first area.