Pixel Driving Circuit Voltage Control for LCD Performance
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices face limitations in the voltage difference between pixel electrodes, which restricts the voltage levels of data voltages, thereby affecting the display performance.
Innovation Solution
The implementation of a pixel driving circuit that includes a liquid crystal capacitor, storage capacitors, and voltage control units, which manage data voltages across different nodes to increase the voltage level at specific nodes, effectively enhancing the voltage difference between pixel electrodes through controlled scan signals and data voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional data voltage levels are used to drive pixel electrodes, then the pixel driving circuit operates within standard voltage ranges, but the voltage difference between pixel electrodes is limited, restricting display performance
Solution Approach 1:
The pixel driving circuit is segmented into multiple functional blocks: a first voltage control unit for controlling a first pixel electrode, a second voltage control unit for controlling a second pixel electrode, and separate data voltage input terminals. This segmentation allows independent voltage control of different pixel electrodes, enabling the first pixel electrode to receive a first data voltage and the second pixel electrode to receive a second data voltage, thereby achieving different voltage differences between adjacent pixels for enhanced display performance
Solution Approach 2:
The patent introduces intermediary voltage control units that act as mediators between the data voltage inputs and the pixel electrodes. These voltage control units process and condition the data voltages before applying them to the pixel electrodes, enabling precise control of voltage levels and differences. The voltage control units serve as intermediary components that transform standard data voltages into the required pixel electrode voltages with enhanced voltage difference capability
2Reliability
If the voltage levels of data voltages are restricted, then the pixel driving circuit remains simple and manageable, but the voltage difference between pixel electrodes cannot be increased, limiting display performance enhancement
Solution Approach 1:
The voltage control units are designed with multi-functionality to manage multiple tasks: receiving data voltages from external terminals, controlling different pixel electrodes independently, and generating the required voltage differences. Each voltage control unit can handle both the first data voltage and the second data voltage, and can control both the first and second pixel electrodes, reducing the need for additional dedicated circuits while achieving enhanced voltage difference control
Solution Approach 2:
The patent employs equipotentiality by connecting the first and second data voltage terminals to the same potential reference and by ensuring that the voltage control units operate with balanced voltage levels. This approach allows the circuit to maintain stable reference potentials while still achieving the required voltage differences between pixel electrodes, simplifying the overall voltage management complexity
Data Source
AI summary
A display device is provided. The display device includes a pixel driving circuit including a liquid crystal capacitor coupled to a first node, a first storage capacitor, and a first voltage control unit. The first storage capacitor has a first terminal directly connected to a second node and a second terminal coupled to a common electrode. The first voltage control unit has first and second output terminals coupled to the first and second nodes, respectively. In a first period, the first voltage control unit feeds a first data voltage to the first node according to a first scan signal. In a second period later than the first period, the first voltage control unit feeds the first data voltage to the second node according to a second scan signal, such that a voltage level at the first node is changed to a first pixel voltage from the first data voltage.