Transparent Electrode OLED Array Substrate Brightness Detection
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Solution Overview
Problem
Current bottom-emitting OLED technology faces challenges with low aperture ratio due to complex pixel driving circuits and inefficient brightness optical compensation, which either require external systems with poor accuracy or increase pixel circuit area and decrease aperture ratio when using internal sensors.
Innovation Solution
The array substrate design includes a light emitting device with a transparent first electrode, a reflective second electrode, and a reflective member between an opaque portion and the light emitting layer, allowing partial light transmission and enabling internal brightness detection without increasing pixel circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If internal brightness detection sensors are integrated into the pixel circuit, then brightness detection accuracy is improved, but pixel circuit area increases and aperture ratio decreases
Solution Approach 1:
The patent merges the brightness detection sensor with the pixel circuit structure by integrating the sensor electrode as part of the second electrode layer. The sensor shares the same transparent conductive material (ITO) and is formed in the same pixel region, allowing brightness detection without occupying additional pixel area. This integration enables the sensor and display function to coexist within the same structural footprint, resolving the contradiction between detection accuracy and aperture ratio.
2Measurement precision
If external brightness detection systems are used, then brightness detection is achieved, but system complexity increases and detection accuracy deteriorates
Solution Approach 1:
The patent implements self-service by enabling the display device to detect its own brightness using an integrated sensor within the array substrate. The sensor electrode directly measures the light emitted by the light emitting layer without requiring external detection systems. This self-detection capability eliminates the need for complex external sensors and processing systems, thereby improving detection accuracy while reducing system complexity.
3Device complexity
If opaque portions are placed under light emitting devices, then pixel driving circuits can be integrated, but light transmission is blocked and aperture ratio decreases
Solution Approach 1:
The patent applies local quality by making the second electrode layer locally transparent in the region where the light emitting device is positioned. While the second electrode remains opaque in areas corresponding to pixel driving circuits (allowing circuit integration), it is formed with transparent conductive material (ITO) in the light emitting region to permit light transmission. This spatial differentiation of optical properties allows both circuit integration and light transmission to coexist, resolving the contradiction between device complexity and illumination intensity.
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 enhances light utilization and brightness detection accuracy, maintaining a high aperture ratio while integrating optical compensation within the array substrate, improving the efficiency of OLED displays.
Implementation Method 1
a reflective member between the opaque portion and the light emitting layer
Implementation Method 2
the first electrode is transparent
Implementation Method 3
OLED display devices
Data Source
AI summary
The disclosure relates to an array substrate, a display panel, a display device, and a method for manufacturing the array substrate. The array substrate includes a first substrate, a light emitting device on the first substrate, the light emitting device including a first electrode, a light emitting layer, and a second electrode sequentially disposed in a direction away from the first substrate, wherein the first electrode is transparent, and wherein the second electrode is reflective, an opaque portion between the first substrate and the light emitting device, wherein a projection of the light emitting device on the first substrate partially overlap with a projection of the opaque portion on the first substrate, and a reflective member between the opaque portion and the light emitting layer.