Connected Cathode Display Layout for Under-Panel Optical Transmittance
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Solution Overview
Problem
Existing display devices face challenges in optimizing the transmittance of optical signals through specific areas to accommodate electronic modules like cameras or sensors without compromising display functionality.
Innovation Solution
A display device design with distinct transmittance areas and integrated cathodes, where high and low transmittance regions are defined to allow optical signal passage while maintaining display functionality, utilizing transparent conductive oxides and metal signal lines for power and driving signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cathode is disposed in the first area to enable optical signal transmission, then the transmittance is improved, but the display functionality deteriorates due to overlapping with the cathode structure
Solution Approach 1:
The first area is segmented into a high transmittance area and a low transmittance area. The high transmittance area allows optical signals to pass through with minimal obstruction, while the low transmittance area contains the cathode structure that overlaps with this region. This segmentation enables simultaneous optimization of optical transmission and display functionality in different sub-regions of the first area.
2Device complexity
If the cathode of multiple pixels is electrically connected to reduce manufacturing complexity, then the device complexity is reduced, but the transmittance uniformity deteriorates due to integrated cathode structures
Solution Approach 1:
The integrated cathode structure is designed with spatially varying properties: in the high transmittance area, the cathode has minimal presence to maintain high optical transmission, while in the low transmittance area, the cathode is more prominent and provides the necessary electrical connection function. This local differentiation of cathode quality allows simultaneous achievement of manufacturing simplicity and transmittance uniformity.
3Area of stationary object
If the first pixel circuit is disposed on the second area or peripheral area to increase display area, then the display area is expanded, but the area for optical signal reception is reduced
Solution Approach 1:
The pixel circuit is relocated from the vertical stacking dimension (on top of the light emitting element) to the horizontal plane dimension (on the second area or peripheral area). This dimensional relocation allows the first area to be fully dedicated to optical signal transmission without circuit obstructions, while the display area is expanded by utilizing the second area and peripheral area for circuit placement.
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
Enhances optical signal transmission through designated areas while ensuring effective display performance, supporting integrated electronic modules like cameras and sensors.
Implementation Method 1
the cathode connection line comprises a transparent conductive oxide and overlaps the high transmittance area
Data Source
AI summary
A display device includes a first area and a second area adjacent to the first area. A light emitting element may be disposed on the first area, and a pixel circuit connected to the light emitting element may be disposed on the second area. The first area includes a low transmittance area overlapping a cathode of a first pixel and a cathode of a second pixel and a high transmittance area that does not overlap the cathode of the first pixel and the cathode of the second pixel. Each of the cathode of the first pixel and the cathode of the second pixel receives a power voltage having a constant level during a first period and receives a driving signal during a second period.