CN111061081B - High-contrast display film based on micro telescopic array - Google Patents

Abstract

The invention discloses a high-contrast film display method based on a micro telescopic array, wherein a display film consists of a black substrate, the micro telescopic array and a PDLC display layer, the distance from the black substrate to the PDLC display layer is increased through the micro telescopic array, the display contrast of the display film is improved, the display film applies different voltages through an array electrode to control the transmittance change of each pixel of the PDLC, external natural light is reflected to passively display an image, when the transmittance of a certain pixel is the maximum, the pixel displays full black, when the transmittance of a certain pixel is the minimum, the pixel displays full white, and the display effects corresponding to different transmittances are different in display gray scale.

Description

High-contrast display film based on micro telescopic array

Technical Field

The invention relates to the technical field of display electronic products, in particular to a high-contrast thin film display method based on a micro telescopic array.

Background

The development of display technology is changing day by day with the improvement of people's standard of living, and display equipment in the market is full of wealth now, and flexible film display has been a popular research direction in the technical field of display electronic products nowadays. Flexible thin film display devices will be an important direction for the development of future display devices. Flexible thin film display devices will have many important use scenarios, such as electronic skins, electronic maps, outdoor advertising screens, electronic curtains, and the like.

The Polymer Dispersed Liquid Crystal (PDLC) is prepared by uniformly dispersing nematic liquid crystal molecules in a transparent polymer network, because the liquid crystal molecules have a birefringence effect on light, when no voltage is applied, the ordinary light refractive index of liquid crystal droplets in the polymer network is mismatched with the refractive index of a polymer, the PDLC material presents opaque milky white and presents scattering of the light, the PDLC is called to present an off state, after a certain voltage is applied to the PDLC, the arrangement direction of the liquid crystal molecules is consistent with the arrangement direction of an electric field under the action of the electric field, the ordinary light refractive index of the liquid crystal molecules is approximately equal to that of the polymer, and the PDLC presents a transparent state, which is called an on state of the PDLC.

The contrast ratio of the display device refers to the ratio of the brightest white area to the darkest black area in the display range, the larger the ratio is, the more gradation from black to white is, and the color expression is richer for the color display device. Because human eyes are very sensitive to the change of the brightness of the display, the high contrast ratio can enable the human eyes to see more subtle changes, and for a viewer, the image displayed by the display equipment with the high contrast ratio is clearer and more natural, and the brightness and darkness details are richer.

When PDLC is in an opaque milky state, the transmittance cannot be made completely zero due to scattering of light, and when PDLC is placed on a non-white material, the smaller the distance between PDLC and the material, the easier the color of the material can be seen through PDLC, and conversely, if PDLC is sufficiently distant from the material, the color of the material cannot be seen through PDLC at all.

Disclosure of Invention

The purpose of the invention is: a high-contrast thin film display method based on a micro telescopic array is provided, a display thin film is composed of a black substrate, the micro telescopic array and a PDLC display layer, the distance from the black substrate to the PDLC display layer is increased through the micro telescopic array, and the display contrast of the display thin film is improved.

The black substrate is a layer of pure black light absorption film, is made of light absorption materials, is adhered with the micro telescope array and is positioned on the focal plane of the micro telescope array.

The micro telescope array is a plurality of micro-sized convex lenses manufactured on a PET film by using a nano-imprinting technology, and the maximum cross section diameter of each small convex lens is consistent with the size of an upper PDLC pixel.

The optical center of each micro lens of the micro telescopic array corresponds to the center of one pixel of the PDLC display layer, and focal planes of each small convex lens on the micro telescopic array are superposed into the same plane.

The PDLC display layer is manufactured by manufacturing pixel blocks by using a PET film plated with an ITO conductive layer through laser engraving, and clamping a PDLC layer between upper and lower layers of ITO film control layers processed by laser by using a sandwich structure.

The PDLC display layer controls the transmittance change of each pixel of the PDLC by applying different voltages through the array electrodes, and displays a gray image.

The display film passively displays images in a mode of reflecting external natural light, different voltages are applied through the array electrodes to control the transmittance change of each pixel of the PDLC, when the transmittance of a certain pixel is the maximum, the pixel displays full black, when the transmittance of a certain pixel is the minimum, the pixel displays full white, and the display effects corresponding to different transmittances are different in display gray.

For the convex lens, when a point light source is positioned on the object space focal plane of the convex lens, the light emitted by the point light source at the image space is parallel light, and it can be understood that when the point light source is seen through the convex lens from the image space, the position of a virtual object is at infinity, the distance between the black substrate and the PDLC display layer is increased under the condition that the actual thickness of the display film is not obviously increased, so that the PDLC is whiter when displaying white, and the contrast of the display film is improved. Assuming that the maximum luminance when the PDLC display layer displays white is a, and the minimum luminance when the PDLC display layer displays black is B, the display contrast C can be expressed as:

drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a schematic structural diagram of an embodiment of a high contrast thin film display method based on a micro telescopic array according to the present invention;

FIG. 2 is a schematic diagram of an array electrode of a PDLC display layer of the high contrast thin film display method based on a micro telescopic array according to the present invention;

FIG. 3 is a functional diagram of a micro telescopic array based on the high contrast thin film display method of the present invention.

Detailed Description

The technical solution of an embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the following examples are given for illustrative purposes only and are not to be construed as limiting the scope of the present invention, and that the skilled person in the art will be able to make various insubstantial modifications and adaptations of the present invention based on the above disclosure.

A high contrast film display method based on a micro telescope array is disclosed, as shown in figure 1, a display film is composed of a black substrate 1, amicro telescope array 2 and aPDLC display layer 3, and the distance from the black substrate 1 to thePDLC display layer 3 is increased through themicro telescope array 2, so that the display contrast of the display film is improved.

The black substrate 1 is a pure black light absorption film, is made of light absorption materials and can be made of black PET, black flannelette or black light absorption sponge, the black substrate 1 is positioned on a focal plane of themicro telescope array 2, and the black substrate 1 and themicro telescope array 2 are adhered together by using flexible glue.

Themicro telescope array 2 is a plurality of micro-sized convex lenses manufactured on a PET film by using a nano-imprinting technology, and the maximum cross section diameter of each small convex lens is consistent with the pixel size of the PDLC on the upper layer or is slightly larger than the pixel size of the PDLC display layer.

The optical center of each micro lens of the microtelescopic array 2 corresponds to the center of one pixel of the PDLC display layer, and the focal planes of each small convex lens on the micro telescopic array are superposed into the same plane.

ThePDLC display layer 3 is manufactured by laser engraving using a PET film coated with an ITO conductive layer to form pixel blocks and leads, as shown in fig. 2. A PDLC layer is filled between an upper layer of ITO thin film control layer and a lower layer of ITO thin film control layer which are processed by laser by using a sandwich structure, and a display layer with independently controlled upper and lower voltages of each pixel block is manufactured. The black substrate 1, the smalltelescopic array 2 and thePDLC display layer 3 are adhered together by using flexible glue, so that the manufactured display film can be curled under the condition of not influencing the display effect.

ThePDLC display layer 3 applies different voltages to each pixel block through the array electrodes etched by the ITO layer laser on the sandwich structure to control the transmittance change of each pixel of the PDLC, and when the transmittance of a certain pixel is the maximum, the pixel displays full black by reflecting external natural light and matching with the black substrate and the tiny telescopic array, and when the transmittance of a certain pixel is the minimum, the pixel displays full white, and the display effects corresponding to different transmittances are different in display gray.

Because for a convex lens, when a point light source is at the object focal plane of the convex lens, the point light source emits parallel light at the image side, it is understood that the virtual object is located at infinity when viewed from the image side through the convex lens, as shown in figure 3, therefore, in this embodiment, the existence of the micro telescopic array makes the black substrate an imaginary object at infinity, and the distance between the black substrate and the PDLC display layer is increased without significantly increasing the actual thickness of the display film, so that the PDLC is whiter when displaying white, because the definition of the display contrast is the ratio of the brightest white brightness to the darkest black brightness in the display area, the method provided by the invention realizes that the brightness of the display film when the display film displays white is greatly improved under the condition of not increasing the thickness of the display film, thereby improving the contrast of the display film.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (2)

1. A high-contrast display film based on a micro telescopic array is characterized in that the display film consists of a black substrate, the micro telescopic array and a PDLC display layer, the distance from the black substrate to the PDLC display layer is increased through the micro telescopic array, the display contrast of the display film is improved, the black substrate is a pure black light absorption film and is made of light absorption materials, and the black substrate, the pure black light absorption film and the micro telescopic array are adhered together and are positioned on a focal plane of the micro telescopic array; the display film passively displays images in a mode of reflecting external natural light, different voltages are applied through an array electrode of an ITO conductive layer in the PDLC display layer to control the transmittance change of each pixel of the PDLC display layer, when the transmittance of a certain pixel is the maximum, the pixel displays full black, when the transmittance of a certain pixel is the minimum, the pixel displays full white, and the display effects corresponding to different transmittances are different in display gray; the micro telescope array is a plurality of micro-sized convex lenses manufactured on a PET (polyethylene terephthalate) film by using a nano-imprinting technology, and the maximum cross-sectional diameter of each micro-sized convex lens is consistent with the pixel size of the PDLC display layer; the optical center of each micro-size convex lens of the micro telescopic array corresponds to the center position of one pixel of the PDLC display layer, and focal planes of the micro-size convex lenses on the micro telescopic array are superposed into the same plane; the existence of the micro telescope array enables the black substrate to become a virtual object at infinity, the distance between the black substrate and the PDLC display layer is increased under the condition that the actual thickness of the display film is not obviously increased, the PDLC display layer is white when displaying white, and therefore the contrast of the display film is improved.

2. The display film with high contrast ratio based on the micro telescopic array as claimed in claim 1, wherein the PDLC display layer comprises array electrodes and leads formed by laser engraving the ITO conductive layer, and a PDLC layer is filled between the upper and lower laser engraved ITO conductive layers to form a PDLC display layer with each pixel block capable of being controlled independently.

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