Gate Driving Circuit Shift Register Segmentation
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Solution Overview
Problem
The existing gate driving circuits in liquid crystal displays (LCDs) face challenges in maintaining signal intensity due to circuit sharing, leading to insufficient driving capability, which affects the frame rate and causes color washout issues.
Innovation Solution
A gate driving circuit with multiple shift registers and control units is implemented, including first and second shift registers, scan signal generators, and driving signal generators, which share control units to prevent signal intensity abatement and reduce chip area, while ensuring non-overlapping scan and driving signals to enhance pixel charging and optical effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-stage shift register outputs multiple scan signals to drive multiple rows of pixels, then the frame rate is improved, but the driving capability becomes insufficient due to excessive load
Solution Approach 1:
The gate driving circuit is segmented into multiple independent shift registers (first shift register, second shift register, third shift register, fourth shift register) instead of using a single-stage shift register. Each shift register drives a specific group of scan lines, distributing the driving load across multiple independent units. This segmentation resolves the contradiction by maintaining driving capability through distribution while achieving high frame rate through parallel operation of multiple shift registers.
2Area of stationary object
If circuit sharing is implemented in the gate driving circuit, then the chip area is reduced, but the signal intensity abates
Solution Approach 1:
The control units are extracted and shared independently from the shift registers. Each shift register has its own dedicated scan signal generation circuitry, while the control units that generate control signals are shared across multiple shift registers. This extraction allows the signal generation paths to remain independent (maintaining signal intensity) while the control logic is shared (reducing chip area).
Solution Approach 2:
The control units are designed with multi-functionality to serve multiple shift registers. A single control unit can generate control signals for multiple different shift registers by receiving different clock signals and control inputs. This universality allows one control unit to perform the function of multiple dedicated control units, reducing the overall chip area while maintaining the independence of each shift register's signal generation.
3Object-affected harmful factors
If pixels are divided into multiple display regions with additional driving signals, then color washout is resolved, but the driving capability becomes insufficient due to excessive load on the shift register
Solution Approach 1:
The pixel array is segmented into multiple independent pixel groups, with each group having its own dedicated shift register and scan lines. This segmentation allows each shift register to drive a manageable number of pixels without excessive load, while the collective operation of multiple shift registers covers the entire display area. The additional driving signals for different display regions are provided by different shift registers operating in parallel, resolving the contradiction between resolving color washout and maintaining driving capability.
Data Source
AI summary
A display panel and its gate driving circuit are provided. The gate driving circuit includes a plurality of shift registers. Each of the shift registers includes a first scan signal generator for generating a first scan signal, a second scan signal generator for generating a second scan signal, a first control unit for generating a first control signal, and a second control unit for generating a second control signal. Here, the first control signal and the second control signal are shared by the first scan signal generator and the second scan signal generator. Based on the above, the abatement of signal intensity of the first scan signal and the second scan signal caused by circuit sharing can be precluded, and a chip area occupied by each of the shift registers can be reduced.