Array Substrate with Photosensitive Sensor for Brightness Uniformity
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Solution Overview
Problem
Current methods for screen brightness compensation in display devices, such as OLED panels, cannot effectively address brightness uniformity issues caused by aging, as they primarily focus on compensating for threshold voltage and mobility changes in Thin Film Transistors (TFTs) rather than aging-related brightness variations.
Innovation Solution
An array substrate with a photosensitive sensor connected to a first thin film transistor, where the dielectric layer, made through anodic oxidation, covers the conductive channel to prevent hydrogen gas permeation and includes a preparation method involving a metal oxide film, allowing real-time luminance detection and compensation to improve brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TFT compensation methods are used, then threshold voltage and mobility changes are compensated, but aging-related brightness uniformity issues are not effectively addressed
Solution Approach 1:
The patent implements a feedback mechanism where photosensitive sensors detect the actual luminance of display pixels in real-time, and this detection information is fed back to a compensation circuit that adjusts the driving voltage of TFTs accordingly. This closed-loop feedback system dynamically compensates for aging-related brightness variations, effectively improving brightness uniformity while addressing the limitations of conventional open-loop compensation methods
Solution Approach 2:
The patent introduces photosensitive sensors as intermediary elements between the display pixels and the compensation circuit. These sensors act as mediators that convert optical information (luminance) into electrical signals that can be processed by the compensation circuit, enabling indirect measurement and compensation of brightness uniformity issues without directly interfering with the display structure
2Manufacturing precision
If photosensitive sensor is added for real-time luminance detection, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the photosensitive sensor with the TFT structure by integrating the sensor's photosensitive layer with the TFT's active layer in the same semiconductor layer. This combined structure allows dual functionality (TFT operation and luminance sensing) within a single integrated device, reducing the number of separate components and simplifying the overall device architecture while maintaining manufacturing precision
Solution Approach 2:
The patent designs the semiconductor layer to serve multiple functions: it acts as both the active layer for TFT operation and the photosensitive layer for luminance detection. This multi-functional design allows the same structural element to perform both switching/control functions and sensing functions, thereby improving brightness uniformity without proportionally increasing device complexity
3Reliability
If dielectric layer is formed by anodic oxidation to prevent hydrogen gas permeation, then reliability is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent replaces conventional thermal oxidation or chemical vapor deposition processes with anodic oxidation, which is an electrochemical process driven by electrical current. This substitution allows for more precise control of the dielectric layer formation, better adhesion to the underlying metal layer, and improved protection against hydrogen gas permeation, while the process can be integrated into existing semiconductor manufacturing lines
4Productivity
If metal layer is used for both drain and dielectric layer formation, then manufacturing steps are reduced, but control precision may be compromised
Solution Approach 1:
The patent segments the metal layer into functionally distinct regions through selective patterning: one region forms the drain electrode while another region forms the basis for the dielectric layer through anodic oxidation. This segmentation is achieved by using photolithography masks to define different patterns on the same metal layer, allowing precise spatial control of material functionality without requiring separate metal deposition steps for each function
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
The solution enables real-time brightness compensation and enhances uniformity by detecting actual pixel luminance and preventing adverse hydrogen gas effects, effectively addressing aging-related brightness changes in display devices.
Implementation Method 1
forming a dielectric layer by anodic oxidation on the region covering the conductive channel in the metal layer pattern
Implementation Method 2
the dielectric layer... to prevent hydrogen gas permeation
Implementation Method 3
The photosensitive sensor detects the actual luminance brightness of display pixels provided with the array substrate in real time
Data Source
AI summary
Disclosed are an array substrate, a preparation method thereof, a display panel and a display device. The array substrate includes a base substrate, a first thin film transistor, a photosensitive sensor, and a dielectric layer. The first thin film is on the base substrate and includes a gate, a drain, a source and a conductive channel between the drain and the source. The photosensitive sensor has the drain of the first thin film transistor as an electrode of the photosensitive sensor. The dielectric layer covers the conductive channel of the first thin film transistor, where the dielectric layer is a metal oxide film.