Gate Driver With Stage Groups For LCD Cost Reduction
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Solution Overview
Problem
The increasing number of gate lines in liquid crystal display (LCD) devices leads to a proportional increase in manufacturing costs due to the need for multiple gate-driving integrated circuits and tape carrier packages, which is inefficient and costly.
Innovation Solution
A gate driver system is designed with multiple stage groups and a single gate-driving integrated circuit that supplies phase-different clock pulses to each stage group, allowing for sequential and controlled output to gate lines, reducing the number of required gate-driving ICs and IC packages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple gate-driving integrated circuits are used to drive gate lines, then the gate lines can be driven effectively, but the number of ICs and tape carrier packages increases, leading to higher manufacturing costs
Solution Approach 1:
Multiple stage groups are integrated into a single gate-driving IC, allowing the circuit to drive multiple gate lines through internal stage groups rather than requiring separate ICs for each gate line group. This merging approach reduces the total number of ICs and TCPs while maintaining the capability to drive all necessary gate lines.
Solution Approach 2:
The gate-driving IC is designed with multiple stage groups that can sequentially control different gate lines, making a single IC perform the function of multiple ICs. The output controller enables the same hardware to serve multiple purposes by switching between different stage groups for different gate line segments.
2Manufacturing precision
If the number of gate lines is increased to achieve desired resolution, then the display quality improves, but the number of gate-driving ICs and TCPs increases proportionally, increasing manufacturing costs
Solution Approach 1:
The gate driver uses sequential output control where the output controller dynamically switches which stage group is active at different times. This dynamic switching allows a fixed number of stage groups to handle a variable and larger number of gate lines by time-multiplexing the output, enabling high resolution without proportionally increasing the number of ICs.
Solution Approach 2:
The patent introduces a time dimension to the gate driving process by sequentially enabling different stage groups. Instead of requiring simultaneous independent driving capability for all gate lines (spatial dimension only), the system uses temporal sequencing to multiply the effective driving capacity of a limited number of stage groups, thereby supporting more gate lines without adding proportional hardware.
3Ease of operation
If multiple gate-driving ICs are used, then comprehensive control of gate lines is achieved, but manufacturing costs increase due to more ICs and TCPs
Solution Approach 1:
Multiple stage groups are combined within a single gate-driving IC, reducing the total component count. This merging maintains comprehensive gate line control capability while decreasing the number of separate ICs and TCPs that need to be manufactured, assembled, and tested, thereby lowering manufacturing costs.
Solution Approach 2:
The gate-driving IC is designed as a universal controller that can manage multiple gate lines through its multiple stage groups. This multi-functional design eliminates the need for specialized ICs for different gate line segments, simplifying the manufacturing process and reducing costs associated with handling multiple different components.
Data Source
AI summary
A gate driver includes a plurality of stage groups, a gate driving circuit, and an output controller. The gate driving circuit supplies the plurality of stage groups with a plurality of clock pulses. The plurality of stage groups supply the input clock pulses to associated gate lines of a liquid crystal panel. The output controller generates a plurality of control voltage signals that control which of the plurality of stage groups generate an output signal.