Dual Gate Driving Circuit for Display Panel Off Current Reduction
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Solution Overview
Problem
Conventional display panels experience increased off current due to high gate-source voltage, leading to deteriorated image quality and higher power consumption, especially when pixel elements are in a negative or positive polarity state.
Innovation Solution
The display panel employs a dual gate driving circuit system that generates distinct low gate voltages (VGL1 and VGL2) based on the polarity state of pixel elements, with VGL1 being less than VGL2, to effectively turn off pixel elements, thereby reducing the gate-source voltage and off current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single low gate voltage is used to turn off pixel elements, then the device complexity is low, but the off current increases and image quality deteriorates
Solution Approach 1:
The gate driving circuit is segmented into two independent circuits: a first gate driving circuit that generates a first gate pulse signal with a first low gate voltage, and a second gate driving circuit that generates a second gate pulse signal with a second low gate voltage. This segmentation allows each circuit to independently control pixel elements in specific polarity states, thereby reducing off current without requiring excessive complexity in a single circuit.
Solution Approach 2:
Different low gate voltages are applied to pixel elements based on their local polarity state. Pixel elements in a negative polarity state receive a first low gate voltage from the first gate driving circuit, while pixel elements in a positive polarity state receive a second low gate voltage from the second gate driving circuit. This local differentiation optimizes off current reduction for each polarity state independently.
2Ease of manufacture
If a single low gate voltage is used to turn off pixel elements, then the manufacturing process is simple, but image quality deteriorates due to increased off current
Solution Approach 1:
The manufacturing process is segmented into two parallel pathways: one for producing gate pulse signals with a first low gate voltage for negative polarity pixel elements, and another for producing gate pulse signals with a second low gate voltage for positive polarity pixel elements. This segmentation maintains manufacturing simplicity while improving image quality through optimized voltage control.
3Reliability
If a high gate-source voltage is used to turn off pixel elements, then the switching is effective, but the off current increases and power consumption increases
Solution Approach 1:
The gate voltage parameter is changed based on the polarity state of pixel elements. Instead of using a fixed high gate-source voltage to turn off all pixel elements, the system dynamically adjusts the low gate voltage parameter: pixel elements in a negative polarity state are turned off with a first low gate voltage, while pixel elements in a positive polarity state are turned off with a second low gate voltage. This parameter adaptation maintains effective switching while reducing off current and power consumption.
Data Source
AI summary
A display panel includes a first gate driving circuit, a second gate driving circuit, a first pixel element and a second pixel element. The first gate driving circuit generates a first gate pulse signal. The second gate driving circuit generates a second gate pulse signal. The first gate pulse signal and the second gate pulse signal are simultaneously activated. The first pixel element receives the first gate pulse signal. The second pixel element receives the second gate pulse signal. While the first pixel element is in a negative polarity state, the second pixel element is in a positive polarity state, the first pixel element is turned off in response to a first low gate voltage of the first gate pulse signal, and the second pixel element is turned off in response to a second low gate voltage of the second gate pulse signal.