Display Substrate Layout for Under-Screen Optical Transmission
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Solution Overview
Problem
Existing display technologies face challenges in achieving a high screen-to-body ratio due to the presence of optical elements under the display screen, which obstructs the view and reduces the effective display area.
Innovation Solution
A display substrate design with a first and second display region, where the second region surrounds the first, featuring specific arrangements of light-emitting devices, pixel circuits, and leads to optimize the layout and minimize obstruction, allowing for full-screen display and improved light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If optical elements are disposed under the display screen to achieve full-screen display, then the screen-to-body ratio is improved, but the optical elements obstruct the view and reduce the effective display area
Solution Approach 1:
The patent moves the pixel circuits from the front display region to the rear surface of the substrate, utilizing the third dimension (depth/vertical layering) to resolve the conflict between having optical elements under the screen and maintaining display quality. This allows the display surface to be fully occupied by light-emitting structures while circuitry is positioned on the opposite side of the substrate.
Solution Approach 2:
The patent employs a multi-layered substrate structure where the front surface contains light-emitting devices and the rear surface contains pixel circuits, with connection leads passing through intermediate layers. This nested arrangement allows both display elements and circuitry to coexist without interfering with each other's function or appearance.
2Device complexity
If pixel circuits are disposed in the first display region to simplify wiring, then the device complexity is reduced, but the light transmission and display quality are compromised
Solution Approach 1:
The patent relocates pixel circuits from the traditional planar arrangement in the display region to the rear surface of the substrate, creating a vertical separation between light-emitting structures and circuitry. This dimensional reorganization maintains simplified wiring connections while eliminating the obstruction of light transmission paths.
3Area of moving object
If leads are made longer to connect light-emitting devices to pixel circuits on the rear surface, then the full-screen display is achieved, but the parasitic capacitance and signal loss increase
Solution Approach 1:
The patent introduces intermediate connection structures and optimization layers between the light-emitting devices and rear-surface pixel circuits. These intermediary elements serve to minimize the effective electrical path length and reduce parasitic effects, allowing long physical connections to function as if they were shorter electrically.
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 design enhances the screen-to-body ratio by enabling full-screen display while maintaining good image quality and ensuring the optical element can operate effectively by collecting external light, thus improving the overall display performance.
Implementation Method 1
A first light-emitting device in the N first light-emitting devices includes an anode, a light-emitting layer and a cathode that are stacked in sequence
Data Source
AI summary
A display substrate has a first display region and a second display region, and includes first light-emitting device groups disposed in the first display region, first pixel circuit groups disposed in the second display region, lead groups, and a plurality of second pixel circuits disposed in the second display region. A first light-emitting device group includes N first light-emitting devices. A first pixel circuit group includes N first pixel circuits. A lead group includes N leads, an i-th first light-emitting device is electrically connected to an i-th first pixel circuit through an i-th lead, and lengths of 1st to N-th leads increase. At least one line of second pixel circuits is disposed between the 1st first light-emitting device and the 1st first pixel circuit. The N leads extend from the first display region to the second display region passing through the at least one line of second pixel circuits.