Pixel Driving Circuit with Compensating Module for Blue Phase LCD
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Solution Overview
Problem
Liquid crystal display panels, especially those using blue phase liquid crystals, face high dynamic power consumption due to the need for high driving voltages, which increases exponentially with scan signal voltages, leading to increased energy consumption.
Innovation Solution
A pixel driving circuit with a compensating module that combines present and previous stage scan signals to control the driving transistor, reducing the voltage required and thus the dynamic power consumption, comprising a data-inputting module, a compensating module, a storage capacitor, and a liquid crystal capacitor connected to a first node to generate display voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher driving voltages are used to drive blue phase liquid crystals, then the liquid crystal display panel can achieve the required display performance, but the dynamic power consumption increases exponentially
Solution Approach 1:
The patent introduces a compensating capacitor connected to the gate electrode of the driving transistor. During the non-display period, the compensating capacitor pre-charges the gate electrode to a predetermined voltage level. This preliminary action ensures that when the scan signal arrives, the transistor can immediately turn on with the required drive strength without requiring excessively high scan signal voltages, thereby reducing dynamic power consumption while maintaining display performance
Solution Approach 2:
The patent changes the voltage parameter at the gate electrode by introducing a compensating voltage through the compensating capacitor. This voltage parameter change allows the driving transistor to operate at lower scan signal voltages while still achieving the necessary drive current, thus resolving the contradiction between display performance and power consumption
Data Source
AI summary
A pixel driving circuit, a driving method thereof and a liquid crystal display panel are provided. The pixel driving circuit comprising a compensating module which is connected to a driving transistor of a data-inputting module, the compensating module is configured to receive present stage scan signals and previous scan signals and to control the driving transistor to turn on with voltages generated by coupling the present stage scan signals and the previous scan signals to the driving transistor, thus coupling data signals to a first node. Based on this, a dynamic power consumption of the liquid crystal display panel can be reduced.