Display Substrate Cathode Layout for Under-Display Sensor Transmittance
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Solution Overview
Problem
Existing display technologies face challenges in achieving high screen-to-body ratios while accommodating elements like front cameras and light sensors under the display region, leading to reduced light transmittance and potential interference with normal operations.
Innovation Solution
A display substrate design with alternating light-emitting and light-transmitting regions, featuring conductive layers and connection portions in the same layer, allowing for high light transmittance and electrical connectivity of cathode blocks, formed in a single process to reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If elements such as front camera and light sensor are disposed under the display region to improve full-screen display, then screen-to-body ratio is improved, but light transmittance is reduced
Solution Approach 1:
The display region is segmented into alternating light-emitting regions and light-transmitting regions. The light-transmitting regions allow light to pass through to the sensing elements below, while the light-emitting regions provide display functionality. This segmentation resolves the contradiction by creating dedicated zones for both full-screen appearance and light transmission.
Solution Approach 2:
Different regions of the display are given different optical properties: light-emitting regions are designed to emit light for display, while light-transmitting regions are designed to transmit light to underlying sensors. This local differentiation allows the display to simultaneously achieve high screen-to-body ratio and adequate light transmittance for sensor operation.
2Reliability
If connection portions are added to electrically connect cathode blocks in light-transmitting regions, then electrical connectivity is improved, but manufacturing complexity increases
Solution Approach 1:
The connection portions are merged with the conductive layers of the pixel circuit layer, forming a unified conductive structure. The connection portions are made of the same material and are in the same layer as the conductive layers, allowing them to be formed in the same manufacturing process without adding extra process steps. This merging approach maintains electrical connectivity while avoiding increased manufacturing complexity.
Solution Approach 2:
The conductive layers serve multiple functions: they act as both the conductive pathways for the pixel circuits and as the connection portions for electrically connecting cathode blocks in the light-transmitting regions. This multi-functionality eliminates the need for separate connection structures, thereby maintaining manufacturing simplicity while ensuring electrical connectivity.
Data Source
AI summary
A display substrate includes a first display region disposed on a substrate, wherein the first display region includes a plurality of light-emitting regions arranged in an array and a plurality of light-transmitting regions arranged in an array. The plurality of light-emitting regions and the plurality of light-transmitting regions are arranged alternately. Each of the light-emitting regions includes: a conductive layer disposed in the light-emitting region; and a cathode block disposed on the conductive layer. The first display region further includes connection portions that are disposed in the light-transmitting regions and located in a same layer and made of a same material as the conductive layers, and respectively configured to electrically connect cathode blocks of two adjacent light-emitting regions. Further provided is a manufacturing method of a display substrate.