Gate Signal Circuit Layout for Narrow-Bezel Display Panels
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Solution Overview
Problem
Existing display devices face challenges in achieving a narrow bezel design due to complex circuit configurations in shift registers, particularly in gate signal generating circuits.
Innovation Solution
A gate signal generating circuit is designed with a signal control circuit and a signal output circuit that includes pull-up and pull-down transistors with different threshold voltage characteristics, where the pull-up transistor has a negative threshold voltage and the pull-down transistor has a positive threshold voltage, and their gate electrodes are disposed in different layers of the semiconductor layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional shift register circuit is used, then the circuit can perform normal signal shifting function, but the circuit complexity increases and the bezel width cannot be reduced
Solution Approach 1:
The transistor gate is divided into two separate gate electrodes (first gate electrode and second gate electrode) positioned at different layers. This segmentation allows independent control of threshold voltage through different voltages applied to each gate, enabling simplified circuit design while maintaining the required signal shifting function.
Solution Approach 2:
The gate control is extended from a single-plane structure to a three-dimensional layered structure by positioning gate electrodes at different vertical layers. This dimensional change enables more flexible threshold voltage control and reduces the horizontal space required for the circuit, thereby reducing bezel width.
2Device complexity
If transistors with uniform threshold voltage are used, then the circuit design is straightforward, but the circuit cannot be simplified further for narrow bezel application
Solution Approach 1:
Different regions of the transistor (controlled by first and second gate electrodes) are given different electrical characteristics through applying different voltages. This allows the same transistor to exhibit different threshold voltage characteristics as needed by different circuit stages, enabling circuit simplification without sacrificing adaptability.
Solution Approach 2:
The transistor threshold voltage is made dynamically adjustable by changing the voltage applied to the gate electrodes. This dynamic control allows the circuit to be simplified for narrow bezel applications while maintaining the versatility to adapt to different operating conditions when needed.
Data Source
AI summary
A display device in one example includes a display panel configured to display an image and a gate signal generating circuit configured to supply a gate signal to the display panel. The gate signal generating circuit includes a signal control circuit configured to control a Q node and a signal output circuit configured to operate based on a voltage of the Q node to output the gate signal. The signal output circuit includes at least one pull-up transistor and at least one pull-down transistor each including a gate electrode connected to the Q node in common.