Method for setting pretilt angle of liquid crystal molecules

Abstract

The invention provides a method for setting a pretilt angle of liquid crystal molecules, comprising the following steps of: step 1, providing a liquid crystal material, a CF (Color Filter) substrate and a TFT (Thin Film Transistor) substrate; step 2, arranging the CF substrate and the TFT substrate in parallel to form a receiving gap, and filling the liquid crystal material in the receiving gap to form a liquid crystal box; step 3, providing a driving control circuit capable of generating a plurality of driving voltages, and electrically connecting the driving control circuit with the TFT substrate; step 4, providing a small-amplitude oscillating device and an ultraviolet light source variable in irradiation intensity, and arranging the liquid crystal box on the small-amplitude oscillating device; step 5, starting the small-amplitude oscillating device so that the liquid crystal box generates small-amplitude oscillation, closing the driving control circuit and employing the plurality of driving voltages to drive the liquid crystal material, and simultaneously, irradiating the liquid crystal through the ultraviolet light source by different intensities; and step 6, performing the operation of the step 5 not less than one time on the liquid crystal box, thereby completing the setting of the pretilt angle.

Description

technical field [0001] The invention relates to a manufacturing method of a liquid crystal display device, in particular to a method for setting the pretilt angle of liquid crystal molecules in the liquid crystal display device. Background technique [0002] A liquid crystal display device is a display device that includes a liquid crystal material sealed between two opposing substrates and that uses electrical excitation to perform optical switching through photoelectric anisotropy of liquid crystal molecules. At the same time, by utilizing the refractive index anisotropy of the liquid crystal molecules, brightness control is achieved by controlling the difference in the intensity of light transmitted by the liquid crystal molecules by applying a voltage to the liquid crystal molecules and thereby reorienting the axes of the refractive index anisotropy. The quality of a liquid crystal display device depends first on its liquid crystal panel, because the quality of the liqui...

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Problems solved by technology

[0012] The disadvantage of the above method is that it takes many steps to polymerize the photopolymerizable or thermally polymerizable polymer monomers in the liquid crystal material, and each step has different requirements for the composition and intensity of the irradiated light. In addition, for each There are clear boundaries between steps, and the settings of various parameters between steps are different, for example: the moment of driving voltage between steps, the change of light intensity between steps or the change of ultraviolet intensity between steps, etc.

[0013] Moreover, when no voltage is applied or a voltage that cannot deflect the liquid crystal molecules is applied, the pretilt angle of the liquid crystal molecules will change when the light containing ultraviolet light or ultraviolet light is irradiated. If the photopolymerizable polymer monomer is completely polymerized, the liquid crystal If the pretilt angle of the molecules changes greatly, different transmittances will be formed in this area, resulting in abnormal contrast

After the photo- or thermal-polymerizable monomer is polymerized, no voltage is applied or a voltage insufficient to deflect the liquid crystal molecules is applied, and the above-mentioned photo- or thermal-polymerizable The liquid crystal material of the polymer monomer, which will also reduce the production efficiency of the liquid crystal display

[0014] In addition, when light containing ultraviolet rays or ultraviolet rays irradiate the above-mentioned liquid crystal material containing photopolymerizable or thermally polymerizable polymer monomers, since there is a light-shielding part in the TFT substrate, the light-shielding part of the liquid crystal material in the light-shielding part that is not irradiated by ultraviolet rays Or thermally polymerizable polymer monomers may not be completely polymerized, and this part of the liquid crystal will appear in the display area as the liquid crystal material migrates. structure can cause image retention in normal display mode

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