Under-Display Optical Sensing Layout With Transmission Area Pixels
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Solution Overview
Problem
Display devices with optical devices overlapping the display panel experience reduced light incidence, leading to deteriorated optical device function due to coverage by pixels, scan lines, and power lines, which limits their effectiveness in applications like smartphones where a wider display area is desired without holes.
Innovation Solution
A display device design featuring a first display area for image display and a second display area with a transmission area adjacent to the pixels, allowing optical devices to be placed behind the second display area to detect light incident through the transmission area, enhancing light sensing capabilities while minimizing luminance difference between areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If optical devices are arranged to overlap the display panel, then the display area can be widened without holes, but light incident on the optical devices is reduced
Solution Approach 1:
The display panel is divided into a first display area with pixels for image display and a second display area with transmission area for light transmission. This segmentation allows different regions to serve different functions: the first area displays images while the second area transmits light to the optical device, thereby resolving the contradiction between widening display area and maintaining light incidence on optical devices.
Solution Approach 2:
Different areas of the display panel are assigned different optical properties. The first display area has light-blocking pixels for image display, while the second display area has a transmission area with high light transmittance. This local differentiation allows the display panel to simultaneously achieve wide display area and sufficient light transmission to the optical device.
2Measurement precision
If the second display area includes a transmission area, then light sensing capability is improved, but luminance uniformity between areas deteriorates
Solution Approach 1:
The display device dynamically controls the luminance of pixels in the first display area to compensate for the presence of the transmission area. By adjusting pixel brightness levels, the system maintains overall luminance uniformity across the display panel while preserving the light transmission function of the second display area, thus resolving the contradiction between improved light sensing and maintained luminance uniformity.
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
This design ensures improved optical sensing by increasing light incidence on optical devices, maintaining high maximum luminance in the second display area, and reducing manufacturing costs through shared mask processes for electrode formation.
Implementation Method 1
Each of the second sub-pixels includes: a first contact electrode; a second contact electrode located apart from the first contact electrode; and a light emitting element between the first contact electrode and the second contact electrode
Implementation Method 2
an optical device overlapping the second display area of the display panel and configured to detect light incident through the transmission area
Data Source
AI summary
A display device includes: a display panel including a first display area including first sub-pixels to display an image, and a second display area including second sub-pixels and a transmission area adjacent to the second sub-pixels; and an optical device overlapping the second display area of the display panel and configured to detect light incident through the transmission area. Each of the second sub-pixels includes: a first contact electrode; a second contact electrode located apart from the first contact electrode; and a light emitting element between the first contact electrode and the second contact electrode.