CN114935831A

CN114935831A - Display device

Info

Publication number: CN114935831A
Application number: CN202210557705.8A
Authority: CN
Inventors: 孙雪菲
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-08-23

Abstract

The present disclosure provides a display device. The display device includes: a display panel; the grating structure is positioned on the light emergent side of the display panel and comprises a plurality of grating units; wherein the grating unit includes: the first electrode is provided with at least one first bending part; the second electrode is provided with at least one second bending part; and a dielectric layer disposed between the first electrode and the second electrode. The scheme disclosed by the invention forms the bent grating structure based on the double-layer electrode with the bent part, breaks the periodicity and regularity between the display panel and the grating structure, and effectively avoids the generation of moire fringes.

Description

Display device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a display device.

Background

In a display device, a lamination structure may cause moire, which affects visual effect. Especially in a peep-proof naked eye three-dimensional (3D) display device, the regular superposition of the display panel, the grating structure and the support structure results in overlapping of stripes, resulting in severe moire.

For avoiding moire of the display device in the related art, if the design of the display panel is simply changed, the moire cannot be effectively weakened due to the factors of resolution, aperture ratio and the like.

Disclosure of Invention

In view of the above, the present disclosure is directed to a display device to solve or partially solve the above problems.

The present disclosure provides a display device including:

a display panel; and

the grating structure is positioned on the light-emitting side of the display panel and comprises a plurality of grating units;

wherein the grating unit includes:

the first electrode is provided with at least one first bending part;

the second electrode is provided with at least one second bending part; and

a dielectric layer disposed between the first electrode and the second electrode.

From the above, it can be seen that the display device provided by the present disclosure forms the bent grating structure based on the double-layer electrode having the bent portion, breaks periodicity and regularity between the display panel and the grating structure, and effectively avoids generation of moire fringes.

Drawings

In order to clearly illustrate the technical solutions of the present disclosure or related technologies, the drawings used in the embodiments or related technologies description will be briefly introduced below, and obviously, the drawings in the following description are only embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1A shows a schematic diagram of an exemplary display device.

Fig. 1B illustrates a display effect diagram of the display device of fig. 1A.

Fig. 2A illustrates a schematic structural diagram of an exemplary display device provided by an embodiment of the present disclosure.

Fig. 2B illustrates an electrode layout of an exemplary grating structure of a display device according to an embodiment of the present disclosure.

Fig. 2C illustrates a transmission equivalent diagram of an exemplary grating structure of a display device according to an embodiment of the present disclosure.

Fig. 2D shows an enlarged structural schematic of an electrode of a grating structure according to an embodiment of the present disclosure.

FIG. 3A is a schematic diagram illustrating an exemplary projection relationship of a spacer to a first substrate.

FIG. 3B illustrates another exemplary projected relationship of a spacer to a first substrate.

Fig. 4 shows a schematic structural diagram of another exemplary display device provided by the embodiment of the disclosure.

Fig. 5 illustrates a display effect diagram of an exemplary display device provided by an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The occurrence of moire is generally related to the periodicity of the objects and is a visual consequence of interference between objects at constant angles and frequencies. Taking the simplest straight fringe as an example, when two sets of straight fringes with similar periods are superimposed, it is possible to generate a set of interference fringes with a larger period, which is a moire fringe, whose period is the least common multiple of the periods of the two sets of fringes. In the peep-proof naked eye 3D display device, the black matrix stripes in the display panel are overlapped with the stripes of the grating structure, and in addition, the spacer used for supporting is regularly arranged above the black matrix area, so that a serious Moire phenomenon can occur.

Fig. 1A shows a schematic diagram of an exemplary display device 100.

As shown in fig. 1A, the display device 100 may be a peep-proof naked-eye 3D display device, and may further include a grating layer 102 for realizing naked-eye 3D and peep-proof effects, a support layer 104 for supporting the grating layer 102, and a display panel 106 for displaying. The three layers of the grating layer 102, the support layer 104 and the display panel 106 have respective periodic structures, so that the superposition of the three layers may generate severe moire, as shown in fig. 1B.

For avoiding moire of the display device in the related art, such as simply changing the design of the display panel, the parameters of the grating structure, and the size of the spacer for supporting, since the factors affecting the display effect, such as resolution, aperture ratio, etc., need to be considered, moire cannot be completely eliminated.

In view of this, the embodiment of the present disclosure provides a display device, which includes a display panel and a bent grating structure formed on the basis of a double-layer electrode having a bent portion, and by forming the grating structure with the bent portion, the periodicity and regularity between stacked structures are broken, and the generation of moire fringes is effectively avoided. And under the condition of reasonable design, the scheme of the display device does not influence the original display effect.

Fig. 2A illustrates a schematic diagram of an exemplary display device 200 provided by an embodiment of the present disclosure. Referring to fig. 2A, a display device 200 provided in an embodiment of the disclosure may include a display panel 206 and a grating structure 202 disposed on a light exit side of the display panel 206, where the grating structure 202 may further include a plurality of grating units 202A arranged repeatedly.

As shown in fig. 2A, in some alternative embodiments, the grating unit 202A may further include a first electrode 2028 and a second electrode 2030 and a dielectric layer 2024 disposed between the first electrode 2028 and the second electrode 2030. As shown in fig. 2A, the grating structure 202 may further include substrates 2022 and 2026, and the first electrode 2028 and the second electrode 2030 may be respectively arranged on the substrates 2022 and 2026 at equal intervals.

Fig. 2B shows a schematic layout of electrodes in a grating structure 202 according to an embodiment of the present disclosure.

As shown in fig. 2B, when the first electrode 2028 or the second electrode 2030 is viewed from a top view, in some embodiments, the first electrode 2028 or the second electrode 2030 may extend along the first direction x and may be arranged at equal intervals along a third direction z perpendicular to the first direction x. An electric field may be formed between the first electrode 2028 and the second electrode 2030 to control the variation of the dielectric layer 2024, so that the grating structure 202 may form gratings of different sizes.

In some embodiments, the first electrode 2028 and the second electrode 2030 may be made of a conductive material such as an ITO (Indium Tin Oxide) thin film. The ITO is an N-type oxide semiconductor, and an ITO film, namely an indium tin oxide semiconductor transparent conductive film, can be used as a transparent electrode, so that the light transmittance is not influenced.

In some alternative embodiments, the dielectric layer 2024 disposed between the first electrode 2028 and the second electrode 2030 may include liquid crystals. The liquid crystal is a soft substance between a liquid state and a solid state, liquid crystal molecules are deflected in the formed electric field, and the deflection causes the optical orientation of the liquid crystal layer to change, so that the light transmittance is changed, and a grating structure is formed.

In this embodiment, the liquid crystal grating has a 3D visual effect. The working principle of the 3D display technology is as follows: for the same scene, the left eye and the right eye of the viewer respectively receive images, the distance between the two eyes of the viewer in the horizontal direction (i.e. the interpupillary distance is about 65mm) enables the visual angles of the two eyes to have slight difference, due to the difference, the images respectively observed by the left eye and the right eye of the viewer also have slight difference, the difference is called as binocular parallax, and the different images observed by the left eye and the right eye form a pair of stereoscopic image pairs and are fused through the visual cortex of the brain to form a stereoscopic effect.

In this embodiment, the liquid crystal molecules of each grating unit are deflected by the electric field formed between the first electrode 2028 and the second electrode 2030, so as to control the passing and non-passing of the light incident on the liquid crystal grating, thereby obtaining a transparent region and a non-transparent region. Specifically, the liquid crystal molecules corresponding to the region where the electric field exists are deflected, and the other liquid crystal molecules are not deflected. At the moment, after the light enters the liquid crystal layer, the polarization direction can be gradually changed when the light passes through the liquid crystal which is not deflected, and when the light reaches the polaroid, the vibration direction of the polarized light is parallel to the absorption axis of the polaroid, so that the light passes through to form a light-transmitting area of the liquid crystal grating; the polarization direction of the light cannot be changed when the light passes through the deflected liquid crystal, and the vibration direction of the polarized light is vertical to the absorption axis of the polaroid when the light reaches the polaroid, so that the light does not pass through the liquid crystal to form a non-light-transmitting area of the liquid crystal grating; therefore, the visual pictures of the left eye and the right eye are separated, and the 3D display effect is realized.

In another embodiment, the dielectric layer 2024 disposed between the first electrode 2028 and the second electrode 2030 may comprise a dielectric liquid. The electric field formed between the first electrode 2028 and the second electrode 2030 based on the voltage difference drives the dielectric liquid in the dielectric layer 2024 to move, thereby forming a grating.

Further, as shown in fig. 2B, the first electrode 2028 may have at least one first bending portion 20282, and the second electrode 2030 may have at least one second bending portion 20302. Fig. 2C shows a transmission equivalent diagram of grating structure 202 in an embodiment of the present disclosure. As shown in fig. 2C, since the electrodes in the grating structure are arranged to have the bending portions, so that the edge of the light transmission region in the equivalent transmission diagram of the grating structure 202 is formed into a curved shape, and thus, by arranging the grating structure 202 in the display device 200, the linear structure of the grating units in the grating structure in the related art can be broken, thereby improving the moire problem.

In some embodiments, an angle of the first bent portion 20282 and/or the second bent portion 20302 to the first direction x is less than or equal to 6 °, so that an aperture ratio can be ensured. Fig. 2D shows an enlarged schematic view of a single electrode according to an embodiment of the present disclosure. As shown in fig. 2D, taking the first electrode 2028 as an example, the first bending portion 20282 of the first electrode 2028 may include a first side 20282a and a second side 20282b, where the angle between the first bending portion 20282 and the first direction x may refer to angles α and β in the drawing, that is, the included angle between the first side 20282a and the second side 20282b and the first direction x. Therefore, if the clockwise direction of the plane of the first electrode 2028 or the second electrode 2030 is the positive direction, the included angle between at least one of the first bending portion and the second bending portion and the first direction x may be not less than-6 ° and not more than 6 ° to ensure that the moire generation is avoided and the original display effect of the grating structure 101 is not affected.

In addition, in some embodiments, the number of at least one of the first bending part and the second bending part of the grating unit may be 2 to 6. Therefore, the phenomenon that the bending times of the grating structure are too much is avoided, the light-transmitting area formed by the grating is reduced, the intensity of light passing through the liquid crystal grating is weakened, and the aperture opening ratio is reduced. Meanwhile, the problem that when bending is carried out only once, namely the linear grating is only inclined for a certain angle, the effect of avoiding the generation of the moire fringes is probably not good is solved.

Returning to fig. 2A, in some embodiments, the display panel 206 may further include a first substrate 2062, a second substrate 2070 disposed opposite the first substrate 2062, and a liquid crystal layer 2068 disposed between the first substrate 2062 and the second substrate 2070. It can be understood that the first substrate 2062 and the second substrate 2070 may be an array substrate, a color filter substrate, or a panel including functions of both the array substrate and the color filter substrate, which is not limited in this embodiment.

Further, at least one of the first substrate 2062 and the second substrate 2070 may be provided with a black matrix layer 2064. For example, as shown in fig. 2A, the first substrate 2062 may be a color filter substrate, and the black matrix layer 2064 may be disposed on the color filter substrate. The black matrix layer 1032 may be composed of lines crossing in the horizontal and vertical directions, and the lines divide the black matrix into a light-transmitting region and a non-light-transmitting region, wherein the light-transmitting region may further be provided with a corresponding color filter (e.g., color resists of three colors, red, green, and blue).

In some alternative embodiments, as shown in fig. 2A, a support structure for supporting the grating structure 204 may be further disposed between the display panel 206 and the grating structure 204. For example, as shown in fig. 2A, the support structure may include a plurality of first spacers 204.

As an alternative embodiment, as shown in fig. 2A, the display panel 206 may also include a plurality of second spacers 2066 disposed on the first substrate 2062 or the second substrate 2070. The first spacer 204 and/or the second spacer 2066 may be made of various resin materials, including but not limited to acrylate resins, and may be glass beads, etc. The shape of the spacer is not limited further here, and may include a spherical spacer, a columnar spacer, and the like.

Fig. 3A shows a schematic projection relationship between the first spacer 204 or the second spacer 2066 and a color filter substrate (e.g., the first substrate 2062). As shown in fig. 3A, the plurality of first spacers 204 or second spacers 2066 are arranged at equal intervals along the second direction y and the third direction z, and the second direction y intersects with the first direction x (the direction in which the electrodes in the grating structure 202 extend). Thus, the arrangement direction (second direction y) of the spacers is set to form an included angle with the electrode extension direction (first direction x) in the grating structure 202, so that the design of the same arrangement rule adopted by grating arrangement and spacer arrangement in the related art is broken through, and the Moire problem is improved. In some embodiments, in order to avoid the loss of aperture ratio caused by the spacer blocking the transparent region, the angle between the second direction y and the first direction x may be less than or equal to 8 °, so as to ensure that the orthographic projection of the spacer 204/2066 on the first substrate 2062 is located as much as possible in the orthographic projection of the black matrix layer 2064 on the first substrate 2062.

In this embodiment, as shown in fig. 3A, the orthographic projections of the first spacers 204 and/or the second spacers 2066 on the first substrate 2062 are all located in the orthographic projection of the region formed by extending the edge of the non-light-transmitting region of the black matrix layer 2064 to the light-transmitting region by a predetermined distance on the first substrate 2062. If the orthographic projections of the plurality of first spacers 204 and/or second spacers 2066 on the first substrate 2062 are all located within the orthographic projection of the non-light-transmitting region of the black matrix layer 2064 on the first substrate 2062, the complete coverage of the spacers by the black matrix results in no effect on the transmission of light other than the spacer itself having the function of spacing and supporting. Based on this, simply changing the arrangement rule between spacers has little influence on the periodicity and regularity between the stacked structures of the display device, and thus the moire pattern cannot be completely eliminated. Therefore, in the present embodiment, a portion of the first spacers 204 and/or the second spacers 2066 is disposed outside the non-light-transmitting region of the black matrix layer 2064 (as shown in fig. 3A), so that the superposition rule of the display device in the related art can be broken.

Specifically, the predetermined distance may be less than or equal to 10 μm. After extending the edge of the opaque region of the black matrix layer 2064 outward by a predetermined distance, a target region is formed, and the orthographic projection of the plurality of first spacers 204 and/or second spacers 2066 on the first substrate 2062 is located in the orthographic projection of the target region on the first substrate 2062. If the predetermined distance is greater than 10 μm, the occupation ratio of the spacers in the AA region is high, which may affect the aperture ratio of the display device and thus the display effect.

In addition, in some embodiments, the pitch of the first spacers 204 and/or the second spacers 2066 in the third direction z (e.g., the distance between the axes of the adjacent spacers) and the pitch of the grating unit 202A in the third direction z (e.g., the distance between the same-side edges of the first electrodes of the adjacent grating units) do not have an integral multiple relationship, so as to avoid moire fringes caused by regular overlapping between the grating structure and the spacers when the grating structures and the spacers are arranged in the integral multiple relationship.

Fig. 3B shows another projection relationship between the first spacer 204 or the second spacer 2066 and the color filter substrate (e.g., the first substrate 2062). In another embodiment, as shown in fig. 3B, the plurality of first spacers 204 or second spacers 2066 have no regular arrangement, i.e., the arrangement of the spacers is random or random. Of course, it is understood that the arrangement of the plurality of first spacers 204 or second spacers 2066 still takes into account the above factors affecting the aperture ratio and generating moire: the pitch of the plurality of first spacers 204 and/or second spacers 2066 in the third direction z is not in integral multiple with the pitch of the grating units in the third direction z; the orthographic projections of the plurality of first spacers 204 and/or second spacers 2066 on the first substrate 2062 are all located in the orthographic projection of the region on the first substrate 2062 formed by extending the edge of the non-light-transmitting region of the black matrix layer 2064 outward by a predetermined distance, and the predetermined distance is less than or equal to 10 μm.

It should be understood that the design of the number of the first and second bending portions and the included angle between the first bending portion and the second bending portion in the present embodiment needs to be modified synchronously with the arrangement of the plurality of first spacers 204 and/or second spacers 2066. The method can comprise the following steps: above the region where the plurality of first spacers 204 and/or second spacers 2066 are located above the region where the edge of the opaque region of the black matrix layer 2064 extends outward by a predetermined distance, the direction of the outward extension and the positive and negative included angles between the first bending portion and the first direction x and between the second bending portion and the first direction x need to be mutually coordinated.

Fig. 4 shows a schematic diagram of another display device 200 provided by the embodiment of the present disclosure.

As shown in fig. 4, the display device 200 may further include: the anti-peeping film 208 is disposed on one side of the grating structure 202 close to the display panel 206 for achieving an anti-peeping effect.

Based on the above-mentioned optical grating structure of buckling that has the double-deck electrode of kink and a plurality of first shock insulator and the second shock insulator that are certain contained angle with the extending direction of electrode and arrange or irregularly arrange, can realize peeping-proof and bore hole 3D visual effect simultaneously to periodic and regularity between the laminated structure has been changed and the production of mole line has effectively been avoidd. Fig. 5 illustrates a display effect diagram of a display device according to an embodiment of the present disclosure. As shown in fig. 5, the display device provided by the embodiment of the disclosure can improve the moire problem.

The display device may be a product having an image display function, and may be, for example: displays, televisions, billboards, Digital photo frames, laser printers with display function, telephones, mobile phones, Personal Digital Assistants (PDAs), Digital cameras, camcorders, viewfinders, navigators, vehicles, large-area walls, home appliances, information inquiry apparatuses (e.g., business inquiry apparatuses, monitors, etc. in the departments of e-government, banking, hospitals, electric power, etc.).

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.

The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.

Claims

1. A display device, comprising:

a display panel; and

the grating structure is positioned on the light emergent side of the display panel and comprises a plurality of grating units;

wherein the grating unit includes:

the first electrode is provided with at least one first bending part;

the second electrode is provided with at least one second bending part; and

2. The display device according to claim 1, wherein the first electrode and the second electrode extend in a first direction, and wherein an angle between at least one of the first bent portion and the second bent portion and the first direction is less than or equal to 6 °.

3. The display device according to claim 1, wherein the number of at least one of the first bending portion and the second bending portion is 2 to 6.

4. The display device according to claim 1, wherein an orthographic projection of the first electrode on the display panel partially overlaps with an orthographic projection of the second electrode on the display panel.

5. The display device according to claim 2, wherein a plurality of first spacers are disposed between the display panel and the grating structure;

the plurality of first shock insulators are arranged at equal intervals along a second direction and a third direction, the second direction is intersected with the first direction, and the third direction is perpendicular to the first direction; or

The plurality of first shock insulators do not have a regular arrangement.

6. A display device as claimed in claim 5, characterised in that the second direction makes an angle with the first direction which is smaller than or equal to 8 °.

7. The display device according to claim 5, wherein the display panel comprises:

a first substrate;

a second substrate disposed opposite to the first substrate; and

a liquid crystal layer disposed between the first substrate and the second substrate;

wherein a plurality of second spacers are arranged on the first substrate or the second substrate;

the plurality of second shock insulators are arranged at equal intervals along a second direction and a third direction, the second direction is intersected with the first direction, and the third direction is perpendicular to the first direction; or

The second spacers do not have a regular arrangement.

8. The display device according to claim 7, wherein a pitch of the plurality of first spacers in the third direction does not have an integral multiple relationship with a pitch of the grating units in the third direction; and/or

The pitch of the plurality of second spacers along the third direction does not have an integral multiple relationship with the pitch of the grating units along the third direction.

9. The display device according to claim 7, wherein at least one of the first substrate and the second substrate is provided with a black matrix layer; the black matrix layer is provided with a light-transmitting area and a non-light-transmitting area, and after the edge of the non-light-transmitting area extends to the light-transmitting area for a preset distance, the extending area and the non-light-transmitting area form a target area;

the orthographic projections of the first and second spacers on the first substrate are in the orthographic projection of the target area on the first substrate.

10. A display device as claimed in claim 9, characterised in that the predetermined distance is less than or equal to 10 μm.

11. A display device as claimed in any one of claims 1 to 10, wherein the dielectric layer comprises a dielectric liquid or a liquid crystal.