Dual Photo-Sensor OLED Brightness Control
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Solution Overview
Problem
Conventional organic electroluminescent displays face challenges in accurately adjusting brightness due to interference from scanning circuits and environmental factors, affecting power consumption and energy efficiency.
Innovation Solution
An organic electroluminescent display unit is designed with integrated dual photo-sensors, including reflective and transparent electrodes, a conductive layer with a light-shielding pattern, and a passivation layer, which allows for precise brightness adjustment by generating a photocurrent difference to accurately measure external light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single photo-sensor is used to sense external light intensity, then power consumption is reduced and energy saving is achieved, but the accuracy of brightness adjustment is easily affected by interference from scanning circuits and environmental temperature
Solution Approach 1:
The patent divides the single photo-sensor into two separate photo-sensors: a first photo-sensor for sensing external light intensity and a second photo-sensor for sensing interference signals (such as scanning circuit emissions). By segmenting the sensing function, the system can distinguish between actual light intensity and interference, thereby improving measurement accuracy while maintaining power savings
Solution Approach 2:
The patent introduces a light-shielding pattern as an intermediary structure that selectively blocks light from reaching the second photo-sensor while allowing light to reach the first photo-sensor. This intermediary element enables the second photo-sensor to measure only interference signals, which are then used to compensate for measurement errors in the first photo-sensor
2Reliability
If the photo-sensor cannot adjust brightness effectively according to external light intensity, then the organic electroluminescent display cannot display suitable brightness, but integrating photo-sensor fabrication into display panel fabrication increases manufacturing complexity
Solution Approach 1:
The patent merges the photo-sensor fabrication process with the organic electroluminescent display fabrication process. Both photo-sensors and display components are manufactured using the same thin-film deposition and patterning techniques on the same substrate, eliminating the need for separate photo-sensor manufacturing and reducing overall device complexity
Solution Approach 2:
The patent employs universal fabrication methods and materials that serve multiple functions: the same transparent electrode materials and thin-film deposition techniques are used for both the photo-sensors and the display's pixel electrodes, making the manufacturing process universally applicable to both components
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 enhances the accuracy of brightness adjustment, reducing power consumption and fabrication costs by integrating photo-sensors into the display panel, thereby improving energy efficiency and reducing fabrication costs.
Implementation Method 1
The first photo-sensitive layer is sandwiched between the first reflective bottom electrode and the first transparent top electrode. The second photo-sensitive layer is sandwiched between the second reflective bottom electrode and the second transparent top electrode.
Data Source
AI summary
An organic electroluminescent display unit suitable to be electrically connected to a scan line and a data line including at least one transistor, a first photo-sensor, a second photo-sensor, a conductive layer, an organic electroluminescent layer and a cathode layer is provided. The conductive layer entirely covers the second photo-sensitive layer. A method of fabricating an organic electroluminescent display unit with the integrating a fabrication of a photo-sensor into a fabrication of the organic electroluminescent display panel is further provided. The cost for fabricating the organic electroluminescent display unit of the invention can be further reduced.