Display Device Source Driver Voltage Application Method
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Solution Overview
Problem
Current display devices require large and costly source driver circuits to generate high voltages for liquid crystal elements, limiting their size, cost, power efficiency, and image quality.
Innovation Solution
A method for operating a display device that applies potentials higher and lower than the maximum and minimum potentials generated by the source driver circuit to a display element by concurrently supplying potentials through data lines, allowing for high voltage application with reduced power consumption and smaller device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a source driver circuit is designed to generate high voltage for liquid crystal elements, then the display element can be driven with high voltage, but the source driver circuit occupies a large area and entails high costs
Solution Approach 1:
The voltage generation function is segmented between the source driver circuit (generating only low voltages within its safe range) and an external voltage source (generating the required high voltage). The source driver circuit is divided into a normal voltage generation unit and a voltage application unit that works cooperatively with the external high voltage source through the liquid crystal element, allowing each component to operate within its optimal voltage range without requiring the source driver circuit to handle high voltages directly.
2Strength
If a source driver circuit is designed to generate high voltage for liquid crystal elements, then the display element can be driven with high voltage, but the source driver circuit entails high costs
Solution Approach 1:
The high voltage generation function is extracted from the source driver circuit and assigned to an external voltage source. This extraction allows the source driver circuit to be manufactured with standard low-voltage components, significantly reducing manufacturing costs while still achieving the required high voltage operation through the cooperative voltage application method.
3Illumination intensity
If high voltage is applied to liquid crystal elements for high luminance display, then high-luminance images can be displayed, but power consumption increases
Solution Approach 1:
The high voltage is applied periodically only during the display period when high luminance is required, rather than continuously. The power supply unit applies high voltage to the pixel in synchronization with the display timing, allowing the liquid crystal element to achieve high luminance when needed while minimizing power consumption during non-display periods.
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
Enables the application of high voltage to display elements, reducing power consumption and device size while maintaining high image quality and reliability, even with source driver circuits that do not have high withstand voltage.
Implementation Method 1
supply of a first potential to the pixel through the first data line and supply of a second potential to the pixel through the second data line are performed concurrently, and then a third potential is supplied to the pixel through the second data line, whereby the first potential held in the pixel is changed to a fourth potential
Data Source
AI summary
A display device in which high voltage can be applied to a display element is provided. A display element includes a pixel provided with a display element including a pixel electrode and a common electrode, and the pixel is electrically connected to a first data line and a second data line. Supply of a first potential to the pixel through the first data line and supply of a second potential to the pixel through the second data line are performed concurrently, and then a third potential is supplied to the pixel through the second data line, whereby the first potential held in the pixel is changed to a fourth potential, and the fourth potential is applied to the pixel electrode. Here, the second potential is a potential calculated based on the first potential. When the value of the second potential is less than or equal to a potential applied to the common electrode, the third potential is higher than the potential applied to the common electrode. In contrast, when the value of the second potential is greater than or equal to the potential applied to the common electrode, the third potential is lower than the potential applied to the common electrode.