CN107305302B

CN107305302B - Digital window and display device

Info

Publication number: CN107305302B
Application number: CN201610245253.4A
Authority: CN
Inventors: 马耀东; 张琳; 武文轩
Original assignee: Beijing Bayi Space LCD Technology Co Ltd
Current assignee: Beijing Bayi Space LCD Technology Co Ltd
Priority date: 2016-04-19
Filing date: 2016-04-19
Publication date: 2023-09-15
Anticipated expiration: 2036-04-19
Also published as: CN107305302A

Abstract

The invention relates to a digital window and a display device. The digital window comprises at least three electrode layers and at least two PDLC film layers, and is used for displaying preset contents in a matrix display mode when preset voltages are input to the at least three electrode layers. The display device provided by the invention comprises the digital window. The digital window is in a positive mode or a negative mode, and can respectively display full on, full off, numbers, partial letters and prompt signs under specific logic.

Description

Digital window and display device

Technical Field

The invention relates to the technical field of display, in particular to a digital window and a display device.

Background

Devices for polymer and liquid crystal droplet dispersion formation have been a fifty years history and have so far been developed into the technical field of the liquid crystal industry, and polyvinyl alcohol water-soluble polymers were mixed with cholesteric liquid crystals for thermochromic or field-color-changing display by Jier (Churchill) et al in the early days. In the last eighties, fu Gengsheng (Fergason) invented a liquid crystal droplet dispersion system prepared from polyvinyl alcohol aqueous solution and positive nematic liquid crystal, and a light valve and a display using scattering or absorption (adding dye into liquid crystal) as a mechanism were prepared through the procedures of coating, drying, compounding and the like. The kent state university invented a method of mixing polymer monomer or prepolymer with positive nematic liquid crystal to form a homogeneous phase solution, coating and compounding, then using heating, ultraviolet irradiation or electron beam irradiation to make the liquid crystal gradually separate into microdroplet dispersion system in the course of increasing molecular weight, and named PDLC (Polymer Dispersed Liquid Crystal) polymer dispersed liquid crystal light valve and display. U.S. patent application publication No. US5056898A (inventor glaring east, wu Baogang et al, 1989) discloses an inversion polymer dispersed liquid crystal display (Reverse Mode Microdroplet Liquid Crystal Light Shutter Displays) in which the function of power-on transparency, power-off milky white or absorption of a conventional PDLC is reversed to a power-off transparency, power-on milky white or absorption state. However, since polymer dispersed liquid crystal films have long been used as single pixel light valves for ambient light, i.e., as light control glass for use in the construction industry. The PDLC has a limitation of a single driving mode, so that the PDLC cannot be applied to the field of digital display.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a digital window and a display device, which can solve the problem that the PDLC driving mode in the prior art is single and cannot be applied to the field of digital display.

In a first aspect, the present invention provides a digital window, where the digital window includes at least three electrode layers and at least two PDLC film layers, and is configured to display preset contents in a matrix display manner when preset voltages are input to the at least three electrode layers.

Optionally, the digital window is configured as a rectangle, including: the first electrode layer, the first PDLC film layer, the second electrode layer, the second PDLC film layer and the third electrode layer are sequentially arranged from bottom to top; wherein, the liquid crystal display device comprises a liquid crystal display device,

the first electrode layer comprises M rows of electrode plates of a first preset number, and the M rows of electrode plates are arranged in the long side direction; m is a positive integer; the first preset number is the number of each column;

the third electrode layer comprises N rows of electrode plates with second preset number, wherein the N rows of electrode plates are arranged in the short side direction; n is a positive integer; the second preset number is the number of each row;

electrode lead ends connected with each electrode sheet are arranged on the side surfaces of the first electrode layer and the third electrode layer; an electrode lead terminal is arranged on the side face of the second electrode layer;

when a preset voltage is applied between the electrode plate in the first electrode layer and the second electrode layer, controlling the region of the first PDLC film layer in the crossing region of the electrode plate and the second electrode layer to be turned on and off;

and when a preset voltage is applied between the electrode plate in the second electrode layer and the third electrode layer, controlling the region of the second PDLC film layer in the crossing region of the electrode plate and the third electrode layer to be turned on and off.

Optionally, when the digital window is a 4*5 point array, the method includes:

the first electrode layer is provided with 5 rows of electrode plates in the long side direction; the third electrode layer is sequentially provided with 4 rows of electrode plates in the short side direction, wherein the first row and the fourth row comprise 2 electrode plates, and the second row and the third row comprise 1 electrode plate;

or alternatively, the process may be performed,

the first electrode layer is provided with 5 rows of electrode plates in the long side direction, and each row comprises 2 electrode plates; the third electrode layer is provided with 4 rows of electrode plates in sequence in the short side direction.

Optionally, when the digital window is a 5*7 point array, the method includes:

the first electrode layer is provided with 7 rows of electrode plates in the long side direction; the third electrode layer is sequentially provided with 5 rows of electrode plates in the short side direction, wherein the first row and the fifth row comprise 2 electrode plates, and the second row, the third row and the fourth row comprise 1 electrode plate;

or alternatively, the process may be performed,

7 rows of electrode plates are arranged on the first electrode layer in the long side direction, and each row of electrode plates comprises 2 electrode plates; the third electrode layer is provided with 5 columns of electrode plates in the short side direction.

Optionally, the first electrode layer and the electrode pad on the third electrode have the same width.

Optionally, a dry method, a wet method or a laser etching process is adopted to obtain the electrode slice in the first electrode layer or the third electrode.

Alternatively, the first PDLC film layer or the second PDLC film layer is implemented using positive PDLC or negative PDLC.

Optionally, the first electrode layer, the second electrode layer and the third electrode layer are made of a light-transmitting plastic conductive film.

Optionally, the plastic conductive film is one or more of PET polyester indium tin oxide, zinc tin oxide, nano silver wire or graphene.

In a second aspect, embodiments of the present invention further provide a display device including the digital window described above.

According to the technical scheme, the at least three electrode layers and the at least two PDLC film layers are arranged and are used for displaying preset contents in a matrix display mode when preset voltages are input to the at least three electrode layers, so that the problem that the PDLC driving mode is single and cannot be applied to the field of digital display in the prior art can be solved. In addition, the connecting lines between the PDLC film layer and the electrode layer can be led out from the edge of the PDLC film layer, so that the display space of the PDLC film layer is not occupied, the display effective area is 100%, and the display efficiency is greatly improved.

Drawings

The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:

FIG. 1 is a cross-sectional view of a digital window made of a two-layer PDLC film in accordance with an embodiment of the present invention;

FIG. 2 is a top view of a two layer PDLC film and a 4*5 matrix digital window in accordance with an embodiment of the invention;

FIG. 3 is a digital schematic diagram of the digital window display of FIG. 2 from 0 to 9;

FIG. 4 is a schematic diagram of the positive and negative control logic provided by an embodiment of the present invention;

FIG. 5 is a top view of a two layer PDLC film and a 4*5 matrix digital window in accordance with another embodiment of the invention;

FIG. 6 is a schematic diagram of the digital window display hint characters of FIG. 5;

FIG. 7 is a top view of a two layer PDLC film and a 5*7 matrix digital window in accordance with an embodiment of the invention;

FIG. 8 is a schematic diagram of the numerical window of FIG. 7 displaying numerals and hint characters;

FIG. 9 is a top view of a two layer PDLC film and a 5*7 matrix digital window in accordance with another embodiment of the invention;

FIG. 10 is a schematic diagram of the digital window display character shown in FIG. 9;

fig. 11 is a schematic diagram of the beginning of a dimming glass provided by an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, the PDLC film layer used in the embodiment of the present invention is made of a positive PDLC film. The positive type PDLC film has the following characteristics: when the electrode layers on both sides are simultaneously inputted with logic high voltage, the positive type PDLC film is in an optical on state, and allows light to pass through. When one electrode layer is arranged on two sides and inputs logic low voltage, the positive type PDLC film is in an optical off state and does not allow light to pass through.

Example 1

The embodiment of the invention provides a digital window, which comprises at least three electrode layers and at least two PDLC film layers, wherein the digital window is used for displaying preset contents in a matrix display mode when preset voltages are input to the at least three electrode layers.

Optionally, the digital window is configured as a rectangle, as shown in fig. 1, including: the first electrode layer A1, the first PDLC film layer B1, the second electrode layer C, the second PDLC film layer B2 and the third electrode layer A2 are sequentially arranged from bottom to top; wherein, the liquid crystal display device comprises a liquid crystal display device,

the first electrode layer A1 comprises M rows of electrode plates of a first preset number, wherein the M rows of electrode plates are arranged in the long side direction; m is a positive integer; the first preset number is the number of each column;

the third electrode layer A2 includes N columns of second preset number of electrode pads arranged in the short side direction; n is a positive integer; the second preset number is the number of each row;

when a preset voltage is applied between an electrode plate in the first electrode layer A1 and the second electrode layer C, controlling the region of the first PDLC film layer in the crossing region of the electrode plate and the second electrode layer C to be turned on and off;

when a preset voltage is applied between the electrode plate in the third electrode layer A2 and the second electrode layer C, the region of the second PDLC film layer in the crossing region of the electrode plate and the second electrode layer C is controlled to be turned on and off.

It should be noted that, in the embodiment of the present invention, the first electrode layer A1 and the third electrode layer A2 are composite layers formed by an insulating layer and a conductive metal layer. The conductive metal layer of the first electrode layer A1 is above the insulating layer, and the conductive metal layer of the third electrode layer A2 is below the insulating layer, i.e., the conductive metal layers are all disposed inside the digital window, i.e., opposite to the PDLC film layer. The insulating layer is mainly used for preventing the conductive metal layer from contacting other charged bodies to cause level change and poor display, and is also used for fixing the conductive layer. Of course, the first electrode layer A1 and the third electrode layer A2 may be made of other structures or other materials, which is not limited by the present invention.

In the embodiment of the invention, the first electrode layer A1 and the third electrode layer A2 may be made of plastic conductive films. Preferably, the plastic conductive film can adopt one or more of PET polyester indium tin oxide, zinc tin oxide, nano silver wires or graphene. Of course, the invention is not limited by the three or four layers. In addition, in the embodiment of the present invention, the second electrode layer C may be implemented as a conductive metal layer, or may be implemented in a multi-layer manner of conductive metal layer-insulating layer-conductive metal layer, and a person skilled in the art may select a material capable of implementing light transmission and conductivity as the second electrode layer C.

According to the invention, the at least three electrode layers and the at least two PDLC film layers are arranged and are used for displaying preset contents in a matrix display mode when preset voltages are input to the at least three electrode layers, so that the problem that the PDLC driving mode is single and cannot be applied to the field of digital display in the prior art can be solved. In addition, the connecting lines between the PDLC film layer and the electrode layer can be led out from the edge of the PDLC film layer, so that the display space of the PDLC film layer is not occupied, the display effective area is 100%, and the display efficiency is greatly improved.

Example two

An embodiment of the present invention provides a digital window, as shown in fig. 2, which is a matrix display unit (shown in fig. 2, c) of 4*5, and includes a first electrode layer A1 (shown in fig. 2, a) and a third electrode layer A2 (shown in fig. 2, b). The positional relationship of the first PDLC film layer, the second PDLC film layer, and the second electrode layer C (not shown in fig. 2) is referred to in embodiment one, and will not be described here.

It should be noted that, the digital window in the embodiment of the present invention is designed according to a commonly used rectangle, so that five layers of materials constituting the digital window are also rectangular. The long side direction refers to a straight line where the long side of the rectangle is located, and the short side direction refers to a straight line where the wide side of the rectangle is located.

In the embodiment of the invention, the first electrode layer A1 and the third electrode layer A2 are made of thin film ITO (Indium Tin Oxide). The conductive metal layer on the first electrode layer A1 is etched into 5 electrode plates (i.e. 5 pen segments) respectively numbered 1, 2, 3, 4 and 5 in the long side direction of the first electrode layer A1 by adopting a wet method, a dry method or a laser etching process, and the common electrode 6 is connected with the second electrode layer C. Similarly, the third electrode layer A2 is etched three times in the long side direction and one time in the wide side direction, thereby obtaining 6 electrode sheets (i.e., 6 pen segments), as shown in fig. 2 b, the first and fourth columns of 2 electrode sheets, the second and third columns of 1 electrode sheet. Preferably, the ratio of the lengths of the two electrode sheets on the first column and the fourth column is 3:2 and are respectively numbered 7 to 12.

It should be noted that, in the embodiment of the present invention, all the electrode plates have the same width, but different lengths. The first electrode tab A1 and the third electrode tab A3 were overlapped up and down to obtain a digital window displayed in a 4*5 matrix as shown in fig. 2 c.

In the embodiment of the present invention, the common electrode 6 is connected to the second electrode C, and the other electrodes are connected to one sides of the electrode sheets 1 to 5 and 7 to 12, respectively. Thus, all electrode leads of the digital window are led out from the periphery, so that no electrode reference is generated in the digital window, and the utilization rate of the display panel can reach 100%.

In order to embody the effectiveness of the digital window provided by the embodiment of the present invention, a control manner of the digital window is described below.

Table 1 level truth table for electrodes 1 to 12

In table 1, the first column indicates the numbers and photoelectric states of "1", "2", "3", … …, "0", etc. displayed by the digital window. The first row represents electrode pad number, "H" represents optical on-state; "L" represents the optical off state, and finally the digital window is displayed as shown in FIG. 3. Referring to fig. 3, the first row shows numerals "1" to "5", respectively, and the second row shows numerals "6" to "0", respectively.

Note that, the logical relationship shown in table 1 is applicable to the positive type PDLC film product, i.e., the first PDLC film layer B1 and the second PDLC film layer B2 need to use the positive type PDLC film product. Of course, the PDLC film layer of the embodiment of the present invention may also be an inversion PDLC film layer, and the logic relationship is opposite to that in table 1. Fig. 4 shows the logical relationship of the positive PDLC film product and the negative PDLC film master, respectively:

(1) Positive PDLC film product:

a or B is L (low potential), and L (off) is output;

a and B are H (high potential) and output H (on).

(2) Inverse PDLC film product:

a and B are L (low potential), and output L (on);

a or B is H (high potential), and H (off) is output.

For the function and features of the inverted PDLC film product, reference is made to U.S. patent application publication No. US5056898A, which is not described in detail herein.

Example III

The embodiment of the present invention also provides a digital window, as shown in fig. 5, which is a matrix display unit of 4*5 (shown in fig. 5, c), and has the same structure as the digital window provided in the embodiment, and is different in that: the first electrode layer A1 is etched 4 times in the long side direction to form 5 electrode plates, then each obtained electrode plate is equally divided into two electrode plates from the wide side direction, finally 10 electrode plates shown in a diagram in fig. 5 are obtained, the first column is sequentially encoded into 21-25, and the second column is sequentially encoded into 26-30. The third electrode layer A2 is etched 3 times in the broadside direction to form 4 electrode plates, and the electrode plates are sequentially coded into 31-34. Wherein the common electrode 35 is connected to the second electrode layer C. Finally, the first electrode layer A1 and the third electrode layer A2 are overlapped, so that a digital window of a 4*5 matrix structure as shown in a c diagram in fig. 5 is obtained, and the digital window has 15 electrode leads.

The digital window provided by the embodiment of the invention can display the following steps: prompts such as "," "up", "down", "A", "P", and the like, and photoelectric states. For example ": "means a reminder between numerals such as" time "," minute "and" second ". "up" and "down" are used as the indicators of the Chinese morning and afternoon, or the indicators of the floor numbers in the directions of the stairwells. "A" and "P" respectively represent English prompting letters in the morning and afternoon. The digital window displays the logical relationship of the prompt as described above with reference to table 2.

TABLE 2 level truth table for electrodes 21-35

The final display indicator of the digital window according to the embodiment of the present invention is shown in fig. 6. Referring to fig. 6, a diagram shows a reminder ": ", b illustrates the prompt" up ", c illustrates the prompt" down ", d illustrates the prompt" a ", e illustrates the prompt" P ".

In this embodiment, the first PDLC film layer B1 and the second PDLC film layer B2 are implemented by using a positive PDLC film product, and may also be implemented by using an inverse PDLC film product, which is described in detail in embodiment two and will not be described in detail herein.

Example IV

The embodiment of the present invention further provides a digital window, as shown in fig. 7 c, which is a matrix display unit of 5*7, and the second embodiment is different from the first embodiment in that, referring to fig. 7: as shown in fig. 7 a, the first PDLC film layer A1 was etched 6 times in the longitudinal direction to form 7 electrode plates, each coded 41-47. As shown in fig. 7 b, the third PDLC film layer A2 was etched 4 times in the broadside direction to form 5 electrode sheets, and then the first electrode sheet and the fifth electrode sheet were etched into two electrode sheets in the long side direction, finally obtaining 7 electrode sheets. Preferably, the length ratio of the two electrode plates is 4:3. the 7 electrode plates were coded to 48 to 54.

The digital window provided by the embodiment of the invention can display the numbers 1 to 0 and photoelectric states. Further, "a" and "P" represent english-prompting letters in the morning and afternoon, respectively. The digital window displays the logical relationship of the prompt as described above with reference to table 3.

TABLE 3 level truth table for electrodes 41-55

The final display indicator of the digital window according to the embodiment of the present invention is shown in fig. 8. Referring to fig. 8, the first row shows the numbers "1" to "5", the second row shows the numbers "6" to "0", and the third row shows the prompts "a" and "P".

Example five

The embodiment of the present invention further provides a digital window, as shown in fig. 9 c, which is a matrix display unit of 5*7, and the fourth embodiment is different from the first embodiment in that, referring to fig. 9: as shown in fig. 9 a, the first PDLC film layer A1 was etched 6 times in the long side direction to form 7 electrode sheets, and then etched once more in the wide side direction to obtain the final 14 electrode sheets (i.e., one set including two in the long side direction), which were respectively encoded as 61 to 74. The ratio of the lengths of the two electrode plates in each group of electrode plates is 3:2. as shown in fig. 9 b, the third PDLC film layer A2 was etched 4 times in the broadside direction to form 5 electrode sheets, each encoded 75 to 79. And a common electrode 80.

The digital window provided by the embodiment of the invention can display the number ": the character shapes of "," up "," down ", etc. and the photoelectric state. The digital window displays the logical relationship of the prompt as described above with reference to table 4.

TABLE 4 level truth table for electrodes 61-80

The final display of the digital window of an embodiment of the present invention is shown at cue Fu Rutu. Referring to fig. 10, numerals ": "," up "and" down ".

Example six

The embodiment of the invention also provides a display device comprising the digital window. For example, the display device may be a large-sized timepiece display, or may be provided with a light control glass. When the display device is a light-adjusting glass, as shown in fig. 11, when the material is a positive PDLC and all electrode leads input a low level, the PDLC film layer is in an off state, and light cannot be transmitted. When all electrode leads input high level, the PDLC film layer is in an on state, and light can be transmitted out to realize dimming. When the material is negative PDLC, the switching state is reversed. The common electrode is always connected to the high level.

In the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless explicitly defined otherwise.

Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims

1. The digital window is characterized by comprising three electrode layers and at least two PDLC film layers, wherein the digital window is used for displaying preset contents in a matrix display mode when preset voltages are input to the three electrode layers;

the three electrode layers are respectively a first electrode layer, a second electrode layer and a third electrode layer, and the first electrode layer, the second electrode layer and the third electrode layer are made of light-transmitting plastic conductive films;

the digital window is set to be rectangular, including: the first electrode layer, the first PDLC film layer, the second electrode layer, the second PDLC film layer and the third electrode layer are sequentially arranged from bottom to top; wherein, the liquid crystal display device comprises a liquid crystal display device,

the first electrode layer comprises M rows of electrode plates of a first preset number, and the M rows of electrode plates are arranged in the long side direction; m is a positive integer; the first preset number is the number of M rows of electrode plates;

the third electrode layer comprises N rows of electrode plates with second preset number, wherein the N rows of electrode plates are arranged in the short side direction; n is a positive integer; the second preset number is the number of N rows of electrode plates;

the side surfaces of the first electrode layer and the third electrode layer are provided with first electrode lead ends connected with each electrode sheet; a second electrode lead end is arranged on the side surface of the second electrode layer;

2. The digital window of claim 1, wherein when the digital window is a 4*5 point array, comprising:

or alternatively, the process may be performed,

3. The digital window of claim 1, wherein when the digital window is a 5*7 point array, comprising:

or alternatively, the process may be performed,

4. The digital window of claim 1, wherein the first electrode layer and the electrode pad on the third electrode have the same width.

5. The digital window according to any one of claims 1 to 4, wherein an electrode pad in the first electrode layer or the third electrode is obtained by a dry, wet or laser etching process.

6. The digital window according to any one of claim 1 to 4, wherein,

the first PDLC film layer or the second PDLC film layer is realized by adopting positive type PDLC or negative type PDLC.

7. The digital window of any of claims 2-4, wherein the plastic conductive film is one or more of PET polyester indium tin oxide, PET polyester zinc tin oxide, PET polyester nano silver wire, or PET polyester graphene.

8. A display device comprising a digital window as claimed in any one of claims 1 to 7.