TFT Display Gate Driver Reducing Power Supply Complexity
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Solution Overview
Problem
The increasing demand for power-efficient display devices in mobile electronic apparatuses, such as electrophoretic displays, is hindered by the high cost and complexity of power supply circuits due to the need for multiple power supply voltages, which increases the cost and size of the bezel area in thin-film transistor (TFT) substrates.
Innovation Solution
A display device configuration utilizing a TFT substrate with complementary metal-oxide semiconductor (CMOS) transistors, including p-channel (PMOS) and n-channel (NMOS) transistors, and a reduced number of power supply voltages by employing a gate driver circuit with shift registers and buffer circuits that generate scan signals with lower voltage amplitudes, minimizing the number of required power supply voltages and circuit components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power supply voltages are used to drive the display, then the display can achieve proper transistor control and image quality, but the cost and complexity of the power supply circuit increases
Solution Approach 1:
The patent combines multiple power supply voltage functions into a single power supply circuit by using a dual-gate transistor structure where one gate controls the on/off state and the other gate controls the voltage level, eliminating the need for multiple separate power supply circuits while maintaining proper transistor control
2Reliability
If multiple power supply voltages are supplied to the drive circuit, then the display can be driven properly, but the bezel area increases in size
Solution Approach 1:
The patent merges multiple power supply voltage requirements into a single power supply circuit that can dynamically adjust voltage levels through dual-gate control, thereby reducing the bezel area occupied by power supply circuits while ensuring proper display driving
3Ease of manufacture
If a simple power supply circuit is used, then the cost is reduced, but the ability to control pixel transistors properly is compromised
Solution Approach 1:
The patent uses a single power supply circuit with dual-gate transistor control to provide both simple cost-effective manufacturing and proper pixel transistor control by separating the control functions into two gates: one for switching and one for voltage regulation
Solution Approach 2:
The dual-gate transistor structure provides multi-functionality where the same transistor serves both as a switch and a voltage-controlled element, allowing a single power supply circuit to perform multiple functions that would traditionally require separate circuits
Data Source
AI summary
A display device comprising: a display portion that is provided on a thin-film transistor (TFT) substrate and that comprises pixel capacitors and pixel transistors included in a plurality of pixels arranged in a matrix in a first direction and a second direction intersecting the first direction, a plurality of scan lines each coupled to some of the pixels arranged in the first direction, and a plurality of video signal lines each coupled to some of the pixels arranged in the second direction; and a driver that is provided on the TFT substrate and that is configured to supply video signals to the video signal lines and to control the pixel transistors to be on and off through the scan lines.