Blue-phase liquid crystal display device

Abstract

The invention provides a blue-phase liquid crystal display device. A field order display mode is adopted to be matched with a blue-phase liquid crystal layer, and displaying with high penetration rate and high color range is achieved. A first electrode and a second electrode which are horizontally distributed are arranged on a lower substrate, a third electrode and a fourth electrode are arranged on the lower substrate and an upper substrate respectively, when the first electrode and the second electrode are powered up, the electric potential difference exists between the first electrode and the second electrode to form a horizontal electric field, the blue-phase liquid crystal layer turns from a dark state to a transparent state, the light ray of the backlight can be displayed through an color picture, and the third electrode and the fourth electrode are not powered up at this moment, are used as floating electrodes and can improve the penetration rate of the display device; when the liquid crystal display device needs to conduct image switching of different colors, the first electrode and the second electrode are powered off, meanwhile the third electrode and the fourth electrode are powered up, so that the electric potential difference exists between the third electrode and the fourth electrode to form a vertical electric field, the blue-phase liquid crystal layer turns from a transparent state to a dark state, the light ray cannot pass through the blue-phase liquid crystal layer, hysteresis of blue-phase liquid crystal is effectively improved, and the color mixing problem in color switching is solved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a blue phase liquid crystal display device. Background technique [0002] With the development of display technology, liquid crystal displays (Liquid Crystal Display, LCD) and other flat display devices are widely used in mobile phones, televisions, personal Various consumer electronic products such as digital assistants, digital cameras, notebook computers, and desktop computers have become the mainstream of display devices. [0003] Most of the liquid crystal display devices currently on the market are backlight liquid crystal displays, which include a liquid crystal display panel and a backlight module (Backlight Module). The working principle of the liquid crystal display panel is to place liquid crystal molecules between two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates. The direction of the liquid crystal mo...

AI Technical Summary

Problems solved by technology

At present, a technical method adopted to achieve high transmittance and high color gamut of liquid crystal display devices is the field sequential display mode. The field sequential display mode is to make the color of the light illuminated by the backlight system to the liquid crystal display panel divided by time. Rotation to achieve color display, no color filter layer is required, greatly improving the transmittance of the liquid crystal display device, but in the field sequential display mode, the liquid crystal display device needs to have fast response

[0006] Blue phase liquid crystal (BP, Blue Phase) has the advantage of fast response, the response time can be less than 1ms, and can be used in field sequential display and 3D display, etc. However, blue phase liquid crystal itself has many disadvantages, for example, the temperature range is narrow, generally 1-2°C, the driving voltage is high, it is difficult to return to the initial state after power-on, that is, there is hysteresis, and it is difficult to be used in practical applications

In order to broaden the temperature range of the blue phase liquid crystal, the method of stabilizing the blue phase liquid crystal with a polymer can be used to widen the temperature range of the blue phase. In order to reduce the driving voltage of the blue phase liquid crystal, it can be driven by raised electrodes to effectively reduce the driving voltage. However, the hysteresis phenomenon has not been well resolved. The hysteresis phenomenon refers to the phenomenon that the blue phase liquid crystal cannot be restored to the original state after the voltage is removed after the power is applied, that is, the penetration rate is not zero after the voltage is removed. The existence of hysteresis will lead to color mixing in the process of color switching

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