Quantum rod membrane

Abstract

The invention relates to a quantum rod membrane used in a backlight module of a liquid crystal display (LCD). The quantum rod membrane comprises a first barrier layer, a secondary wavelength microstructure and a plurality of quantum rods. The secondary wavelength microstructure has optical gratings arranged in parallel directions. Grooves are reserved among the optical ratings in parallel directions and have orientation microstructures. The orientation microstructures are arranged to be vertical to the arrangement directions of the optical gratings, and the tops of the optical gratings have reflective planes. The plurality of quantum rods are stacked in the orientation microstructures in the secondary wavelength microstructure, and the long axis arrangement directions of the plurality of quantum rods are vertical to the arrangement directions of the optical gratings. According to the quantum rod membrane, the penetration or reflection of incident light within different wavelength ranges can be regulated and controlled by controlling the period of the secondary wavelength microstructure; the plurality of quantum rods control the proportion of penetrable blue light to excited red and green light; and white light formed by mixing can be used as backlight of the LCD so as to improve the utilization rate of the backlight module.

Description

Technical field [0001] The invention relates to a quantum rod film used in a backlight module of a liquid crystal display, so that the liquid crystal display has a better color gamut and light source utilization. Background technique [0002] The polarizing plates used in conventional liquid crystal displays generally use absorption polarizing plates. When the unpolarized light emitted by the backlight passes through the polarizing plate, the component in the direction of the absorption axis of the polarizing plate will be absorbed and cannot pass. Therefore, the light transmittance of the polarizing plate to the backlight can only reach below 50% in theory. After the light passes through the electrode layer, color filter, liquid crystal layer and glass substrate of the liquid crystal panel, the user can actually see the brightness of the display. , Only less than 10% emitted by the backlight is left, so the utilization of the backlight is quite low, resulting in a waste of energ...

AI Technical Summary

Problems solved by technology

[0006] Generally, the dichroic ratio (Dichroic Ratio, DR) can be used to evaluate the efficiency of the polarized light source produced by the quantum rod film, and the dichroic ratio is expressed by the formula DR=Y / / / Y ⊥ Calculated, where Y / / is the transmittance obtained by the backlight source when the long axis of the quantum rod film is parallel to the transmittance axis of the polarizer for detection, Y ⊥ is the penetration obtained by the backlight when the long axis of the quantum rod film is perpendicular to the transmission axis of the polarizer for detection. When the backlight does not pass through the quantum rod film, its Y / / with Y ⊥ Almost the same, so the dichroic ratio is close to 1. When the dichroic ratio is larger, it means that the measured sub-rod film has more obvious dichroism, so that the light source excited by the quantum rod film has better polarization. However, when the quantum rod film is applied to the optical film stack structure in the current backlight module, the reflection and refraction between the optical films, or the scattering of the particles added in the optical film will often make the quantum rod film After the excited light source passes through these optical films, the dichroic ratio decreases, so that the polarized light that actually passes through the polarizing plate of the LCD is reduced, and the brightness enhancement effect is not as expected

[0007] Additionally, please refer to figure 1 , in the conventional quantum rod film 1 that uses blue light LB to excite red light LR and green light LG, when the long axis arrangement direction of the quantum rods 2 is the x-axis direction, the x-axis direction component of the blue light LB can be absorbed by the quantum rods 2 absorbs and excites red light LR and green light LG which are both in the x-axis direction, but most of the blue light LB in the y-axis direction directly penetrates the quantum rod 2 to form the penetrating light LB1 in the y-axis direction. The direction of the red light LR and green light LG is inconsistent, so when it is applied to the liquid crystal display later, the penetrating light LB1 of the blue light cannot pass through the penetrating axis of the polarizer and the utilization rate is low, and the more penetrating light LB1 of the blue light, stands for Y ⊥ The greater the component of the quantum rod film 1 is, the lower the dichroic ratio is; in addition, if most of the blue light LB directly passes through the quantum rod 2, the excited red light LR and green light LG will have lower excitation times. The amount of light is less, and the amount of light is relatively insufficient, and it is usually necessary to increase the number of quantum rods 2 to maintain the desired mixed white light color coordinates, resulting in increased material costs; therefore, a novel quantum rod film is needed to reduce the blue light transmission in the y-axis direction. Transmit light LB1, and increase the number of excitations and utilization of quantum rods 2 by blue light LB

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