Transparent flexible liquid crystal display film based on PDLC (Polymer Dispersed Liquid Crystal)

Abstract

The utility model discloses a transparent flexible liquid crystal display film based on PDLC, and belongs to the field of liquid crystal display. The conductive film comprises a first conductive film and a second conductive film, the surface of the first conductive film is provided with a first conductive layer, the surface of the second conductive film is provided with a second conductive layer, and a PDLC coating is coated between the first conductive layer and the second conductive layer; the first conductive layer is etched to form a plurality of cells, each cell is provided with a through micropore, the micropores are filled with conductive slurry, the conductive slurry is connected with a cell outgoing line, and the cell outgoing line is connected to an outgoing line terminal; and a collinear cathode terminal is welded on the second conductive layer. According to the transparent flexible liquid crystal display film, the transparent flexible liquid crystal display film is formed by the two conductive films and the PDLC coating coated between the two conductive films, and the structure is simple. The display array is formed by directly etching the cells on the surface of the first conductive layer, and is combined with the PDLC coating, so that the PDLC coating at the corresponding position can be driven to display transparently by electrifying the cells.

Description

Technical Field

[0001] This utility model belongs to the field of liquid crystal display, specifically relating to a transparent flexible liquid crystal display film based on PDLC. Background Technology

[0002] In the late 1980s, PDLC technology was granted a utility model license by the University of Texas at Kent, USA, and Polytronix, Inc., to commercialize and mass-produce liquid crystal film products. The earliest liquid crystal film products were mainly used in the production of liquid crystal dimming glass, and were first applied to a NASA project in the early 1990s. In the mid-1990s, manufacturers from South Korea and Japan began to enter this field, and Chinese domestic manufacturers also entered the production field more than a decade after the advent of PDLC liquid crystal films. PDLC, also known as dimming film, mainly operates between a scattering state and a transparent state, adjusting its transparency through voltage. Without an applied voltage, the optical axes of the liquid crystal particles are randomly oriented, the effective refractive index does not match the refractive index of the polymer, and incident light is strongly scattered, making the film opaque or semi-transparent. After applying an external voltage, the optical axes of the liquid crystal particles align perpendicular to the film surface and are aligned with the direction of the electric field. The refractive index of the ordinary light emitted by the particles is basically matched with the refractive index of the polymer, incident light is not scattered, and the film becomes transparent.

[0003] Currently, PDLC is mainly used in LCD dimming glass for privacy protection in commercial space decoration, hotel décor, and projection displays. With technological advancements, it is increasingly being applied to dimming control solutions for car sunroofs, ships, and aircraft windows. It also has wide applications in home and office environments, such as bathroom glass and high-end conference room partitions. Furthermore, it can achieve personalized zoned display of fixed patterns and text. Years of research have revealed that, under specific ratios and configurations, PDLC materials can be driven with lower voltage under DC and AC power, enabling them to display dynamic text and patterns. This differs significantly from existing LED display technologies, meeting the market's personalized demands. It can achieve dual-sided display on a single screen, featuring ultra-thinness, ultra-transparency, energy efficiency, and novelty. It is particularly suitable for scenarios with specific requirements for lighting and transparency, such as subway and high-speed train windows, shopping mall and supermarket windows, as well as large commercial and station ceiling-mounted displays. Utility Model Content

[0004] The purpose of this invention is to provide a transparent flexible liquid crystal display film based on PDLC, so as to further simplify the structure and process and further improve the yield.

[0005] The technical solution of this utility model is: a transparent flexible liquid crystal display film based on PDLC, including a transparent first conductive film and a transparent second conductive film. The surface of the first conductive film has a first conductive layer, and the surface of the second conductive film has a second conductive layer. The first conductive layer and the second conductive layer are disposed opposite to each other and coated with a PDLC coating therebetween.

[0006] Multiple cells are etched on the first conductive layer of the first conductive film. Each cell has a through-hole micropore, which is filled with conductive paste. The conductive paste filled in each micropore is connected to a cell lead wire. The first conductive film has lead wire terminals, and each cell lead wire is connected to the lead wire terminals.

[0007] A collinear cathode terminal is welded onto the second conductive layer of the second conductive film.

[0008] As a further improvement of this utility model, pads are provided on the two end faces of the micropore, the pads cover the outer periphery of the micropore, and the thickness of the pads is less than the thickness of the PDLC coating.

[0009] As a further improvement of this utility model, the cell is square.

[0010] The beneficial effects of this utility model are:

[0011] 1. This invention constructs a transparent flexible liquid crystal display film using two conductive films (a first conductive film and a second conductive film) and a PDLC coating between them. It features a simple structure and is characterized by its ultra-thinness (only 0.27mm thick), ultra-transparency (85%-95% light transmittance in the transparent area), and energy efficiency (only 5 watts of power per square meter).

[0012] 2. This invention constructs a display cell array by directly etching cells onto the surface of the first conductive layer. Combined with a PDLC coating, the PDLC coating at the corresponding position can be made transparent by applying electricity to the cells, thus achieving the display of any pattern and enabling double-sided display. This invention sets micro-holes in each cell, filling them with conductive paste to achieve circuit conduction. The conductive paste and cell leads are reliably fixed by pads. The micro-holes and cell leads are extremely small, barely visible to the naked eye, and do not affect the display effect of text and patterns.

[0013] 3. This utility model can be easily mass-produced, the yield rate is greatly improved, and the cost is greatly reduced, making it very practical. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the first conductive film in this utility model;

[0015] Figure 2This is a schematic diagram of the structure of the second conductive film in this utility model;

[0016] Figure 3 This is a schematic diagram of the cell structure in this utility model;

[0017] Figure 4 yes Figure 3 AA view in the middle;

[0018] Figure 5 yes Figure 3 BB view in the middle;

[0019] Figure 6 This is a display state diagram of a specific embodiment of this utility model.

[0020] In the figure, 1-first conductive film; 101-first conductive layer; 2-second conductive film; 201-second conductive layer; 3-PDLC coating; 4-micropore; 5-conductive paste; 6-pad; 7-cell cell; 8-cell cell lead; 9-lead terminal; 11-collinear cathode terminal. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] like Figure 1-5 As shown, a transparent flexible liquid crystal display film based on PDLC includes a transparent first conductive film 1 and a transparent second conductive film 2. The surface of the first conductive film 1 has a first conductive layer 101, and the surface of the second conductive film 2 has a second conductive layer 201. The first conductive layer 101 and the second conductive layer 201 are disposed opposite to each other and a PDLC coating 3 is coated therebetween.

[0024] Multiple closed independent cell cells 7 are etched on the first conductive layer 101 of the first conductive film 1. Each cell cell 7 has a through micropore 4. The micropore 4 is filled with conductive paste 5. The conductive paste 5 filled in each micropore 4 is connected to a cell lead wire 8. The first conductive film 1 is provided with lead wire terminals 9. Each cell lead wire 8 is connected to the lead wire terminals 9.

[0025] A collinear cathode terminal 11 is welded onto the second conductive layer 201 of the second conductive film 2.

[0026] A pad 6 is provided on each of the two end faces of the microvia 4. The pad 6 covers the outer periphery of the microvia 4, and the thickness of the pad 6 is less than the thickness of the PDLC coating 3.

[0027] Cell 7 is a square.

[0028] In this embodiment, the first conductive film 1 and the second conductive film 2 are ITO films.

[0029] A method for fabricating a transparent flexible liquid crystal display film based on PDLC includes the following steps:

[0030] A. The first conductive layer 101 of the first permeable film 1 is laser-etched with multiple cell 7 of a certain size. Figure 1 Taking a 16*16 display module as an example, it is made into display cells.

[0031] B. In each cell 7, through-holes 4 with a diameter of 0.2-0.3 mm are formed by mechanical punching or laser drilling. Conductive slurry 5 of a certain consistency is poured into the microholes 4 to fill the holes. After the conductive slurry 5 is fully connected and cured with the first conductive layer 101, each cell 7 obtains a conductive channel.

[0032] C. The conductive paste 5 filling each micropore 4 is connected to the cell lead-out line 8, and each cell lead-out line 8 is connected to the lead-out line terminal 9. If both sides of the first conductive film 1 have the first conductive layer 101, the first conductive layer 101 on the side without etched cell 7 is directly formed into the cell lead-out line 8 by laser etching. If the first conductive film 1 has the first conductive layer 101 on only one side, transparent or low-visibility conductive paste is screen-printed on the side of the first conductive film 1 without the first conductive layer 101 to form the cell lead-out line 8. For ease of explanation, the cell 7 edge line and cell lead-out line 8 in the attached figure are shown as solid lines, and the actual line diameter is very small and difficult to see with the naked eye.

[0033] D. To ensure the reliability of the conductive paste 5 inside the microvia 4 connecting the first conductive layer 101 with the external circuit, pads 6 are formed on both ends of the microvia 4 by silkscreen printing, ensuring that the pads 6 cover the outer periphery of the microvia 4. The PDLC coating 3 is typically 20 micrometers thick, and the pads 6 are 10 micrometers thick.

[0034] E. Cut the second conductive film 2 to the same size as the first conductive film 1. The surface of the second conductive layer 201 of the second conductive film 2 does not need to be treated. Only one collinear cathode terminal 11 needs to be welded.

[0035] F. A PDLC coating 3 is uniformly coated between the first conductive layer 101 and the second conductive layer 201, so that the first conductive film 1 and the second conductive film 2 are connected as one, forming a transparent flexible liquid crystal display film based on PDLC.

[0036] Display principle: The first conductive film 1 serves as the anode of the display cell, and the second conductive film 2 serves as the common cathode of all display cells. The PDLC coatings 3 on some cells 7 of the transparent flexible liquid crystal display film of the present invention are transparent under current drive, forming a light-transmitting area, while the PDLC coatings 3 on the cells 7 not driven by current are in a scattered state, forming a fogging area. In this way, the required characters and patterns are displayed through light and dark contrast, and the front and back sides of a transparent flexible liquid crystal display film can be displayed by controlling the circuit.

[0037] Taking the 16*16 unit as an example, the cell lead-out wires 8 of the 1st to 16th cells 7 in the 01st to 16th columns on the first conductive film 1 are respectively connected to the lead-out wire terminals 9 and each correspond to the corresponding terminals, and all these terminals are connected to the positive electrode. The common cathode terminal 11 on the second conductive film 2 is connected to the negative electrode (normally open). When any of the cells 7 needs to be transparent, the corresponding terminal is made conductive and the rest of the terminals are disconnected. For example, when the 2nd, 4th, 5th, and 7th display cells in the 02nd column need to be transparent, the 2nd, 4th, 5th, and 7th terminals in the 02nd column are made conductive and the rest of the terminals are disconnected. At this time, the current passes through the cell lead-out wires 8 of the 2nd, 4th, 5th, and 7th cells 7 in the 02nd column on the first conductive film 1 to reach the 2nd, 4th, 5th, and 7th cells 7 in the 02nd column, passes through the corresponding PDLC coatings 3 to make them transparent, then enters the second conductive film 2, and then flows out from the common cathode terminal 11 on the second conductive film 2 to form a closed loop.

[0038] The following takes an example to illustrate the display principle of displaying the character "国" with a 16*16 unit Figure 6 It is the display state diagram of the character "国".

[0039] Such as Figure 6As shown, at this time, the cells 7 in the 01st column of the first conductive film 1 are in a powered-on (transparent) state; the cells 7 in the 01st and 16th rows of the 02nd and 03rd columns are in a powered-on (transparent) state; the cells 7 in the 01st, 3rd - 13th, 15th, and 16th rows of the 04th column are in a powered-on (transparent) state; the cells 7 in the 01st, 3rd, 4th, 6th - 11th, 13th, 15th, and 16th rows of the 05th column are in a powered-on (transparent) state; the cells 7 in the 01st, 3rd, 4th, 6th, 7th, 9th - 11th, 13th, 15th, and 16th rows of the 06th and 07th columns are in a powered-on (transparent) state; the cells 7 in the 01st, 3rd, 4th, 13th, 15th, and 16th rows of the 08th and 09th columns are in a powered-on (transparent) state; the cells 7 in the 01st, 3rd, 4th, 6th, 7th, 9th - 11th, 13th, 15th, and 16th rows of the 10th column are in a powered-on (transparent) state; the cells 7 in the 01st, 3rd, 4th, 6th, 7th, 9th, 11th, 13th, 15th, and 16th rows of the 11th column are in a powered-on (transparent) state; the cells 7 in the 01st, 3rd, 4th, 6th - 10th, 13th, 15th, and 16th rows of the 12th column are in a powered-on (transparent) state; the cells 7 in the 01st, 3rd - 11th, 13th, 15th, and 16th rows of the 13th column are in a powered-on (transparent) state; the cells 7 in the 01st and 16th rows of the 14th and 15th columns are in a powered-on (transparent) state; the cells 7 in the 01st - 16th rows of the 16th column are in a powered-on (transparent) state.

[0040] In circuit control, if binary codes are used to control the opening and closing of the lead terminal 9, where 0 represents closing and 1 represents opening, the codes are as follows: the 01st column is 1111111111111111; the 02nd and 03rd columns are 1000000000000001; the 04th column is 1011111111111011; the 05th column is 1011011111101011; the 06th and 07th columns are 1011011011101011; the 08th and 09th columns are 1011000000001011; the 10th column is 1011011011101011; the 11th column is 1011011010101011; the 12th column is 1011011111001011; the 13th column is 1011111111101011; the 14th and 15th columns are 100000000000001; the 16th column is 1111111111111111. By controlling the opening and closing of the lead terminal 9 through circuit control on the transparent flexible liquid crystal display film of the present utility model, the display of the Chinese character '国' can be achieved.

Claims

1. A transparent flexible liquid crystal display film based on PDLC, characterized in that: It includes a transparent first conductive film (1) and a transparent second conductive film (2). The surface of the first conductive film (1) has a first conductive layer (101), and the surface of the second conductive film (2) has a second conductive layer (201). The first conductive layer (101) and the second conductive layer (201) are disposed opposite to each other and a PDLC coating (3) is applied therebetween. Multiple cells (7) are etched on the first conductive layer (101) of the first conductive film (1). Each cell (7) has a through microhole (4). The microhole (4) is filled with conductive paste (5). The conductive paste (5) filled in each microhole (4) is connected to a cell lead wire (8). The first conductive film (1) has a lead wire terminal (9). Each cell lead wire (8) is connected to the lead wire terminal (9). A collinear cathode terminal (11) is welded on the second conductive layer (201) of the second conductive film (2).

2. The transparent flexible liquid crystal display film based on PDLC according to claim 1, characterized in that: A pad (6) is provided on each of the two end faces of the microhole (4). The pad (6) covers the outer periphery of the microhole (4). The thickness of the pad (6) is less than the thickness of the PDLC coating (3).

3. A transparent flexible liquid crystal display film based on PDLC according to claim 1 or 2, characterized in that: The cell (7) is a square.

Images