Slim Border LCD via Dummy Scan Line and Segmented Gate Drivers
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Solution Overview
Problem
Conventional capacitive coupled (CC) driving methods for LCDs require complicated gate driving units, which occupy significant layout space on the glass substrate, making it difficult to achieve a slim border design.
Innovation Solution
The implementation of a CC driving method using a dummy scan line and common line driving units, where the gate driving units are connected to the common line driving units through the scan lines or dummy scan lines, allowing for a slim border design without the need for complex gate driving units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional gate driving units are used to implement capacitive coupled driving method, then the CC driving function is achieved, but the layout space occupied is large and border cannot be made slim
Solution Approach 1:
The gate driving unit is divided into multiple independent scanning units, where each scanning unit controls a specific region of scan lines. This segmentation allows each unit to be smaller and simpler, enabling slim border design while maintaining the overall CC driving function across the entire display panel.
Solution Approach 2:
Dummy scan lines are introduced as intermediary elements to transmit control signals from the scanning unit to the common electrode without directly connecting to pixel circuits. This intermediary mechanism enables the gate driving unit to be positioned at the border region with reduced area, achieving slim border design.
2Ease of manufacture
If gate driving units are placed outside pixel array, then CC driving method can be implemented, but complicated logic gates are required and layout space is occupied
Solution Approach 1:
The scanning unit is designed to perform multiple functions: it drives scan lines for pixel selection and simultaneously transmits control signals through dummy scan lines to the common electrode. This multi-functionality eliminates the need for separate complicated logic gates, simplifying the circuit while reducing layout space.
Solution Approach 2:
The control signal transmission is moved from a direct horizontal connection within the pixel array to a vertical connection through dummy scan lines extending from the scanning unit. This dimensional change allows the gate driving function to be implemented at the border region with minimal area occupation.
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 configuration enables the CC driving method without complicated circuit designs, reducing the layout space required for gate driving units and allowing for a slim border design in LCDs.
Implementation Method 1
Each of the common lines is capacitively coupled to one row of the pixels... so that the pixel electrode of the pixel can be coupled to a predetermined voltage level
Data Source
AI summary
A display including a pixel array, scan lines, at least one dummy scan line, data lines, common lines electrically insulated from each other, common line driving units, gate driving units, and a source driving circuit. An ith common line is capacitively coupled to an ith row of the pixels. An (i+n)th scan line is electrically connected to an (i+n)th row of the pixels. The dummy scan line is disposed in at least one side of the scan lines without electrically connecting to the pixels. The common line driving units and the gate driving units are respectively disposed at two opposite sides of the pixel array. The gate driving units are respectively connected to one common line driving unit through an ith scan line or the dummy scan line to change a voltage of an (i+n)th or (i−n)th common line. Additionally, an electro-optical apparatus including the above-mentioned display is also provided.