Under-Display Transmissive Area Layout for Full-Screen OLED Panels
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Solution Overview
Problem
Display apparatuses face challenges in achieving full-screen designs due to the space occupied by cameras or sensors, which limit screen size and require design compromises like notches or punch holes, and there is a need to improve transmittance in areas where optical electronic devices are disposed.
Innovation Solution
A display apparatus with a substrate having a display area and a transmissive area, featuring a planarization layer, light emitting elements, a bank covering the anode's end portion in the emission area, and a deposition blocking layer in the transmissive area spaced apart from the bank, allowing for improved light transmittance and preventing film delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera or sensor is disposed on the front surface of the display apparatus, then optical functions are enabled, but screen size is limited and full-screen display cannot be implemented
Solution Approach 1:
The patent embeds the camera or sensor within the display structure by disposing it in the transmissive area where low-resolution pixels are located. The optical electronic device is nested within the display panel layers, allowing it to be hidden beneath the display surface while still functioning. This enables the display to maintain its full-screen appearance while accommodating optical components inside the panel structure.
2Reliability
If metal electrodes are deposited in the transmissive area, then electrical connectivity is improved, but light transmittance is reduced
Solution Approach 1:
The patent applies different structural characteristics to different areas of the display. In the transmissive area, the deposition blocking layer is disposed to prevent metal electrode deposition, maintaining high light transmittance. In contrast, other areas can have full metal electrode coverage for electrical connectivity. This local differentiation allows each area to optimize its function without compromising the other.
Solution Approach 2:
The deposition blocking layer acts as an intermediary element that prevents metal electrodes from being deposited in the transmissive area. This blocking layer mediates between the need for electrical connectivity (by allowing metals elsewhere) and the need for light transmittance (by blocking metals in the transmissive area). The blocking layer is selectively disposed only where needed to prevent deposition.
3Area of stationary object
If the deposition blocking layer is disposed close to the bank, then space is saved, but film delamination occurs
Solution Approach 1:
The patent proactively prevents film delamination by maintaining an appropriate spacing between the deposition blocking layer and the bank. This spacing prevents the harmful interaction that would cause delamination during the deposition process. By anticipating and preventing the delamination issue through proper spacing, the design avoids the need for corrective measures while still optimizing space utilization.
Data Source
AI summary
A display apparatus includes a substrate including a display area including a first area and a second area surrounding the first area, the first area includes an emission area and a transmissive area. The display apparatus further includes a planarization layer disposed on the substrate in the display area. The display apparatus further includes a plurality of light emitting elements disposed on the planarization layer and including an anode, a light emitting layer, and a cathode. The display apparatus further includes a bank disposed to cover a portion of an end portion of the anode in the emission area. The display apparatus further includes a deposition blocking layer disposed on the planarization layer in the transmissive area. The deposition blocking layer is spaced apart from the bank.