Active Device Array Substrate for LCD Black Insertion
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies face issues with image blur when displaying dynamic images due to the need for black insertion, which increases manufacturing costs and shortens backlight module lifetime, and complicates source driver design and fabrication.
Innovation Solution
An active device array substrate with two active devices per pixel unit, where one device handles image data and the other executes black insertion, allowing for improved image display without compromising pixel charging time and simplifying source driver design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If black insertion is implemented using DBL technology, then image quality is improved, but manufacturing cost increases and backlight module lifetime is shortened
Solution Approach 1:
The patent extracts the black insertion function from the backlight module and relocates it to a dedicated black insertion transistor within the pixel circuit. This separation removes the dependency on backlight module modulation, thereby extending backlight lifetime and reducing manufacturing costs while maintaining image quality through electrical control of pixel charge state
Solution Approach 2:
The patent introduces a black insertion transistor as an intermediary element within the pixel circuit that mediates the black insertion function. This transistor acts as a switch to control the discharge path of the pixel capacitor, enabling black state insertion without affecting the backlight module, thus resolving the contradiction between image quality and manufacturing cost/backlight lifetime
2Measurement precision
If data black insertion is implemented by alternately providing image data frame and black image frame, then image quality is improved, but pixel charging time is reduced
Solution Approach 1:
The patent implements dynamic control of the black insertion transistor within the pixel circuit, allowing flexible timing of black state insertion independent of frame timing. This dynamic switching capability enables black insertion to occur during specific time windows without compromising the pixel charging time for image data, thereby maintaining both image quality and adequate charging time
Solution Approach 2:
The patent performs preliminary configuration of the pixel circuit with dedicated transistors for black insertion control, enabling the black insertion function to be pre-prepared and executed at optimal moments without interfering with the pixel charging process. This preliminary circuit design ensures that black insertion can be implemented without reducing pixel charging time
3Measurement precision
If data black insertion technology is implemented, then image quality is improved, but source driver complexity and fabrication complexity increase
Solution Approach 1:
The patent extracts the black insertion control function from the source driver and relocates it to local transistors within each pixel circuit. This decentralization eliminates the need for source drivers to generate and transmit separate black frame data, thereby reducing source driver complexity and fabrication complexity while maintaining image quality through local black insertion control
Solution Approach 2:
The patent enables each pixel circuit to self-manage its black insertion function through locally integrated transistors and control logic. This self-service approach eliminates the need for external source driver intervention for black frame generation, simplifying both source driver design and fabrication while preserving image quality through autonomous pixel-level black insertion
Data Source
AI summary
An active device array substrate is provided. The active device array substrate includes a plurality of pixel units. Each of the pixel units includes a first active device, a first scan line, a second active device, a second scan line, a data line, a common line, and a pixel electrode. The first scan line is electrically connected to a first gate of the first active device. The second scan line is electrically connected to a second gate of the second active device. The data line is electrically connected to a first source of the first active device. The common line is electrically connected to a second source of the second active device. The pixel electrode is electrically connected to a first drain of the first active device and a second drain of the second active device.