LCD Pixel Capacitor Driving Method Same Polarity Charging
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience brightness loss and increased power consumption due to sub-pixel voltages with opposite polarities in capacitors, leading to higher working temperatures and reduced source driver lifetime.
Innovation Solution
Implementing a driving method where sub-pixel voltages in both capacitors of each pixel unit have the same polarity, allowing both capacitors to be charged via the same data line, reducing brightness loss and power consumption, and extending the source driver's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sub-pixel voltages with opposite polarities are applied to the first and second liquid-crystal capacitors of each pixel unit, then the capacitors can be charged via different data lines, but brightness loss occurs in the main slit and power consumption increases
Solution Approach 1:
The patent merges the charging paths of the first and second liquid-crystal capacitors by connecting both to the same data line. This consolidation eliminates the need for separate charging paths, thereby reducing power consumption while maintaining the ability to charge both capacitors effectively.
Solution Approach 2:
The patent changes the voltage polarity parameter from opposite polarities to the same polarity for both liquid-crystal capacitors. This parameter change eliminates brightness loss in the main slit while preserving the charging capability through the unified data line connection.
2Productivity
If data signal driving frequency is increased to charge both capacitors via different data lines, then charging is achieved, but power consumption of the source driver increases and working temperature rises
Solution Approach 1:
The patent merges the charging operation into a single data line, allowing both capacitors to be charged simultaneously or sequentially through the same path. This reduces the driving frequency requirements and consequently lowers the power consumption and working temperature of the source driver.
3Ease of operation
If sub-pixel voltages with opposite polarities are used, then capacitor charging is achieved, but the lifetime of the source driver is shortened
Solution Approach 1:
The patent combines the charging function into a single data line configuration, reducing the operational burden on the source driver. This merger decreases power consumption and working temperature, thereby extending the lifetime and improving the reliability of the source driver while maintaining full charging functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces brightness loss, lowers data signal driving frequency, decreases power consumption, and extends the source driver's lifespan by maintaining lower working temperatures, enabling efficient LCD operation with improved performance.
Implementation Method 1
varying voltage drops between opposite sides of the liquid crystal cells for twisting the angles of the liquid crystal molecules of the liquid crystal cells so that the transparency of the liquid crystal cells can be controlled
Implementation Method 2
Each pixel unit comprises a first liquid-crystal capacitor and a second liquid-crystal capacitor
Data Source
AI summary
A liquid crystal display (LCD) device essentially includes a plurality of data lines, a plurality of gate lines and a plurality of pixel units. Each pixel unit includes a first liquid-crystal capacitor, a second liquid-crystal capacitor, a first switch and a second switch. The first liquid-crystal capacitor of a pixel unit is charged via the first switch of the same pixel unit. The second liquid-crystal capacitor of a pixel unit is charged via the second switch of the same pixel unit and the first switch of a different pixel unit. The sub-pixel voltages corresponding to the first and second liquid-crystal capacitors of the same pixel unit have the same polarity. Furthermore, disclosed is a liquid-crystal display driving method for writing two data signals having same polarity respectively into the first and second liquid-crystal capacitors of a pixel unit via the same date line during two intervals partly overlapped.