Liquid Crystal Display Device with Dynamic Voltage Control
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Solution Overview
Problem
Liquid crystal display devices that are suitable for high-speed response applications, such as head-mounted displays, are not suitable for smartphone applications due to low luminance, and vice versa, necessitating a device that can switch between modes for improved response speed and luminance.
Innovation Solution
A liquid crystal display device with a configuration that includes a first substrate with counter electrodes, a second substrate with a switching element and pixel/common electrodes, and an alternating-current voltage application unit, allowing for multiple display modes by adjusting the frequency and effective value of the alternating-current voltage applied between the counter electrodes, including a first frequency of 240 Hz or lower and a second frequency of 300 Hz or higher, to optimize response speed and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a high voltage (10V or higher) is applied between the pair of electrodes to achieve high-speed response, then response speed is improved, but luminance is reduced
Solution Approach 1:
The patent applies different voltage conditions dynamically based on the desired display mode. In HMD mode, a first alternating-current voltage is applied between the pair of electrodes to achieve high-speed response. In smartphone mode, a second alternating-current voltage with different effective value is applied to prioritize luminance. This dynamic switching of voltage parameters resolves the contradiction between response speed and luminance.
Solution Approach 2:
The patent changes the effective value of the alternating-current voltage applied between the pair of electrodes to switch between display modes. By adjusting the voltage parameter (first effective value for HMD mode, second effective value for smartphone mode), the system optimizes performance for different applications, resolving the trade-off between response speed and luminance.
2Speed
If a high voltage is applied between the pair of electrodes to improve response speed, then response speed is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the voltage applied between the pair of electrodes based on the display mode. In HMD mode where high-speed response is critical, a higher voltage is applied. In smartphone mode where power consumption is more concerning, a different voltage with lower effective value is applied. This dynamic voltage adjustment resolves the contradiction between response speed and power consumption.
Solution Approach 2:
The patent changes the effective value parameter of the alternating-current voltage to optimize the balance between response speed and power consumption for different applications. By using a first effective value for HMD mode and a second effective value for smartphone mode, the system achieves energy-efficient operation while maintaining appropriate performance levels.
3Speed
If a high voltage is applied between the pair of electrodes to achieve high-speed response, then response speed is improved, but flicker increases
Solution Approach 1:
The patent dynamically switches between different voltage application modes to balance response speed and flicker reduction. In HMD mode, the first alternating-current voltage is applied to achieve high-speed response. In smartphone mode, the second alternating-current voltage is applied to minimize flicker. This dynamic switching resolves the contradiction between response speed and flicker.
Solution Approach 2:
By changing the effective value parameter of the alternating-current voltage based on the display mode, the patent optimizes the balance between response speed and flicker. The different voltage parameters produce different liquid crystal molecule alignment behaviors that are optimized for either speed or flicker reduction depending on the application.
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 device can switch between display modes to achieve improved response speed for HMD applications and enhanced luminance for smartphone applications, reducing power consumption and minimizing flickers, while maintaining high mode efficiency.
Implementation Method 1
a liquid crystal layer that is disposed between the first substrate and the second substrate and includes liquid crystal molecules aligned horizontally with respect to the first substrate and the second substrate
Implementation Method 2
apply a voltage to a liquid crystal composition sealed between a pair of substrates to change the alignment state of the liquid crystal molecules in the liquid crystal composition depending on the applied voltage
Data Source
AI summary
A liquid crystal display device of the present invention includes: a first substrate including a pair of counter electrodes; a second substrate including a pixel electrode and a common electrode; and a liquid crystal layer that includes liquid crystal molecules aligned horizontally with the substrates. The liquid crystal display device is configured to perform display in any of multiple display modes. The multiple display modes include: a first display mode of performing display in a first state where an alternating-current voltage is applied at a first frequency between the pair of counter electrodes; and a second display mode of performing display in at least one of a second state where no voltage is applied between the pair of counter electrodes, or a third state where an alternating-current voltage is applied at a second frequency that is higher than the first frequency between the pair of counter electrodes.