LCD Pixel Circuit Layout for Wider Viewing Angles
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Solution Overview
Problem
Liquid crystal display devices suffer from limited viewing angle characteristics, leading to degraded image quality, reduced contrast, and shorter product lifespan due to voltage holding issues and charge leaks, which affect the display of black color and overall display quality.
Innovation Solution
A liquid crystal display device with a pixel structure incorporating multiple switches, resistors, and storage capacitors, where the pixel electrode of one liquid crystal element is connected to another through resistors and switches, allowing for improved voltage distribution and reduced charge leaks, enhancing viewing angle characteristics and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel structure with limited switches and capacitors is used, then the device complexity is low, but the viewing angle characteristics and contrast are insufficient
Solution Approach 1:
The pixel is divided into multiple liquid crystal elements (first liquid crystal element and second liquid crystal element) with different alignment states, allowing each element to contribute differently to the overall display performance and improve viewing angle characteristics
Solution Approach 2:
Multiple functional components including switches, resistors, and storage capacitors are nested within the pixel structure, with the pixel electrode of the first liquid crystal element electrically connected to the pixel electrode of the second liquid crystal element through this nested arrangement, achieving improved voltage distribution and charge retention
2Reliability
If liquid crystal voltage holding property is relied upon without additional capacitors, then the device complexity is low, but charge leaks occur and display quality degrades over time
Solution Approach 1:
Storage capacitors are pre-configured in the pixel circuit to compensate for charge leaks before they affect display quality, ensuring stable voltage holding and preventing degradation over time
Solution Approach 2:
The voltage holding property is enhanced by changing the electrical parameters of the pixel circuit through the addition of storage capacitors and resistors, improving charge retention capability
3Reliability
If multiple liquid crystal elements with different alignment states are used, then the viewing angle characteristics improve, but the device complexity increases
Solution Approach 1:
The pixel is segmented into multiple liquid crystal elements with different alignment states, where each element contributes to specific aspects of viewing angle performance, allowing the system to achieve superior omnidirectional viewing characteristics
Solution Approach 2:
The multiple liquid crystal elements serve multiple functions simultaneously, with each element optimized for different viewing angles while collectively providing improved display performance across all viewing directions
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
The solution improves viewing angle characteristics, maintains high display quality, reduces noise influence, and extends the lifespan of the display device by ensuring accurate gray scale representation and stable voltage holding.
Implementation Method 1
Although liquid crystal has a voltage holding property, the holding rate is not 100%, and there is concern about a leak by charge passing to liquid crystal
Data Source
AI summary
It is an object to provide a liquid crystal display device which has excellent viewing angle characteristics and higher quality. The present invention has a pixel including a first switch, a second switch, a third switch, a first resistor, a second resistor, a first liquid crystal element, and a second liquid crystal element. A pixel electrode of the first liquid crystal element is electrically connected to a signal line through the first switch. The pixel electrode of the first liquid crystal element is electrically connected to a pixel electrode of the second liquid crystal element through the second switch and the first resistor. The pixel electrode of the second liquid crystal element is electrically connected to a Cs line through the third switch and the second resistor. A common electrode of the first liquid crystal element is electrically connected to a common electrode of the second liquid crystal element.