Display Panel Photosensitive Device Segmentation for OLED Color Drift
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display products suffer from inaccurate automatic brightness adjustment due to the offset in color temperature and color trajectory of organic light-emitting diodes (OLEDs), which affects the accuracy of ambient light sensing.
Innovation Solution
A display panel design that includes a non-display region with first light-emitting devices and photosensitive devices to monitor the offset of the OLED's color temperature and color trajectory, while the display region uses second light-emitting devices for normal display and second photosensitive devices to detect ambient light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photosensitive devices are placed in the display region to detect ambient light, then brightness adjustment function is achieved, but the offset of OLED color temperature and color trajectory affects sensing accuracy
Solution Approach 1:
The patent divides the photosensitive devices into two distinct groups: first photosensitive devices located in the non-display region for monitoring OLED luminescence parameters, and second photosensitive devices located in the display region for detecting ambient light. This spatial segmentation allows each group to perform its specific function without interference from the other, resolving the contradiction between achieving brightness adjustment and avoiding OLED luminescence interference.
Solution Approach 2:
The patent extracts the OLED luminescence monitoring function from the ambient light sensing function by placing first photosensitive devices in the non-display region. This separation removes the harmful interference of OLED luminescence from the ambient light detection process, while still allowing the system to compensate for OLED color temperature and color trajectory offsets.
2Measurement precision
If first light-emitting devices and first photosensitive devices are added to the non-display region, then OLED luminescence parameters can be monitored independently, but device complexity increases
Solution Approach 1:
The first light-emitting devices and first photosensitive devices in the non-display region form an integrated monitoring subsystem that serves multiple functions: characterizing OLED luminescence parameters, tracking color temperature drift, and providing compensation data for the display region. This multi-functional design justifies the additional complexity by delivering comprehensive luminescence characterization capabilities.
Solution Approach 2:
The system uses its own first light-emitting devices and first photosensitive devices in the non-display region to self-characterize the luminescence parameters of the OLED material. This self-service approach enables the display panel to automatically monitor and compensate for material degradation without requiring external calibration equipment, making the increased complexity worthwhile.
3Illumination intensity
If automatic brightness adjustment is implemented, then display quality is improved, but power consumption increases when environment brightness is high
Solution Approach 1:
The patent implements a feedback mechanism where second photosensitive devices continuously detect ambient light levels and feed this information back to the control system. The control system then adjusts the luminous brightness of second light-emitting devices in real-time based on the detected environment brightness, enabling automatic brightness adjustment that improves display quality while managing power consumption.
Solution Approach 2:
The system dynamically adjusts display brightness based on real-time ambient light conditions detected by the second photosensitive devices. When environment brightness is high, the display automatically increases luminous brightness to maintain visibility; when environment brightness is low, it reduces luminous brightness to save power. This dynamic adaptation resolves the contradiction between maintaining display quality and managing power consumption.
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 solution enables accurate brightness adjustment by independently monitoring the luminescence parameters of the OLEDs and ambient light, thereby improving the accuracy of brightness control and reducing power consumption.
Implementation Method 1
a photosensitive device assembly including first photosensitive devices and second photosensitive devices arranged in the driving array layer
Implementation Method 2
a light-emitting device layer on a side of the driving array layer away from the substrate, including first light-emitting devices located in the non-display region
Data Source
AI summary
A display panel and a display device are provided. The display panel has a display region and a non-display region. The display panel includes: a substrate; a driving array layer including first pixel circuits in the non-display region and second pixel circuits in the display region; a light-emitting device layer including first light-emitting devices in the non-display region and second light-emitting devices in the display region; and a photosensitive device assembly including first photosensitive devices and second photosensitive devices in the driving array layer. The first light-emitting devices are electrically connected with the first pixel circuits and the second light-emitting devices are electrically connected with the second pixel circuits. An orthographic projection of one first photosensitive device to the substrate at least partially overlaps an orthographic projection of one corresponding first light-emitting device to the substrate, and the second photosensitive devices are arranged in the display region.