Pixel Memory Circuit for Low Power Liquid Crystal Display
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving a high aperture ratio and reducing power consumption while maintaining stable and reliable memory operations, especially in miniaturized portable devices.
Innovation Solution
The implementation of a memory circuit within each pixel, utilizing switching elements, inverters, and analogue switches to generate inverted voltages for AC driving, allowing for reduced circuit size and enabling both analog signal and memory display capabilities, thereby achieving a multi-color pixel memory of 2 bits or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a memory function is added to each pixel to reduce power consumption, then power consumption is reduced, but the circuit size increases and aperture ratio decreases
Solution Approach 1:
The patent combines the memory function with the pixel electrode structure by using the pixel electrode itself as the memory element. The video signal is held in the pixel electrode through capacitive coupling, eliminating the need for separate memory circuits and reducing overall circuit size while maintaining low power consumption.
Solution Approach 2:
The pixel electrode serves dual functions: it acts as both the display element and the memory element. By integrating these functions into a single component, the patent reduces the number of separate elements needed, thereby reducing circuit size while maintaining the power-saving benefits of pixel-level memory.
2Area of stationary object
If the number of constituent elements is reduced to increase aperture ratio, then aperture ratio increases, but memory operation stability may deteriorate
Solution Approach 1:
The patent merges the memory function into the pixel electrode structure, reducing the number of discrete components. The memory operation is achieved through capacitive coupling between the pixel electrode and counter electrode, which maintains stability while maximizing the aperture ratio by eliminating separate memory circuit elements.
3Volume of moving object
If circuit scale is reduced for miniaturization, then device size is reduced, but power consumption management becomes more challenging
Solution Approach 1:
The pixel electrode structure serves itself by functioning as both the display element and the memory element. This self-service approach eliminates the need for additional power-consuming memory circuits, allowing miniaturization to proceed without compromising power consumption management.
Data Source
AI summary
A display device which is used in a miniaturized portable information device can exhibit the low power consumption even when a display is not changed over for a long period in a state that a battery or the like is used as a power source. The display device can maintain a high numerical aperture by suppressing the number of parts even when a memory element is provided to a pixel. In a liquid crystal display device, a pixel exhibits the low power consumption by including a memory element and thus preventing the transmission of a video signal. By making use of a charge held in a pixel electrode of a liquid crystal display panel, a signal for AC driving is formed in the inside of a pixel thus performing AC driving to perform a display without deteriorating liquid crystal even when the video signal is not rewritten. The liquid crystal display device can realize the memory element with the simple constitution without sacrificing a numeral aperture.