CN116931159A

CN116931159A - Double-sided display device

Info

Publication number: CN116931159A
Application number: CN202210484764.7A
Authority: CN
Inventors: 李宜憓; 陈冠州; 郑永志
Original assignee: Innolux Display Corp
Current assignee: Innolux Corp
Priority date: 2022-03-31
Filing date: 2022-05-06
Publication date: 2023-10-24
Also published as: TW202340813A; TWI827041B

Abstract

The disclosure provides a double-sided display device, which comprises a first panel, a second panel, a light guide plate and a light source. The second panel is opposite to the first panel, and the light guide plate is arranged between the first panel and the second panel and comprises a main body part, a first pattern and a second pattern. The main body part comprises a first surface and a second surface, wherein the first pattern is arranged on the first surface, and the second pattern is arranged on the second surface. The light source is disposed adjacent to the light guide plate. Wherein the first pattern is different from the second pattern.

Description

Double-sided display device

Technical Field

The present disclosure provides a dual display device, and more particularly, to a dual display device sharing a light guide plate.

Background

With technological progress and in order to meet consumer demands, various display devices have been developed nowadays. A dual-sided display device is a display device capable of simultaneously obtaining outgoing light on both sides for screen display, and provides multiple and convenient applications, and most of the current designs are to assemble two independent display panels in a back-to-back manner.

However, the existing double-sided display devices on the market still have the defects of large thickness of the whole device or large power consumption. Accordingly, there is a need to provide a dual display device in order to improve the known drawbacks.

Disclosure of Invention

Drawings

FIG. 1A is a schematic side view of a dual-sided display device of an embodiment of the present disclosure;

fig. 1B is a schematic perspective view of a light guide plate according to an embodiment of the disclosure;

FIG. 2 is a schematic side view of a dual-sided display device of an embodiment of the present disclosure;

FIG. 3 is a schematic side view of a dual-sided display device of an embodiment of the present disclosure;

FIG. 4 is a schematic side view of a dual-sided display device of an embodiment of the present disclosure;

FIG. 5A is a schematic side view of a dual-sided display device of an embodiment of the present disclosure;

fig. 5B is a schematic perspective view of a light guide plate according to an embodiment of the disclosure;

FIG. 5C is a schematic perspective view of an optical assembly according to an embodiment of the disclosure; and

fig. 6 is a schematic side view of a dual display device of an embodiment of the present disclosure.

In the drawings, the reference numerals specifically have the following meanings:

10-a first panel;

11-a first diffusion sheet;

12-a first set of optical films;

121. 221-a brightness enhancing film;

122. 222-a diffusion film;

20-a second panel;

21-a second diffusion sheet;

22-a second set of optical films;

30-a light guide plate;

301-a body portion;

301 a-a first surface;

301 b-a second surface;

301 c-side surfaces;

302-a first pattern;

303-a second pattern;

3031-a first prismatic structure;

3031 a-a first stripe structure;

304-a third pattern;

31-a third diffusion sheet;

40-a light source;

a 50-optical component;

501-a second prismatic structure;

501 a-a second stripe structure;

502-surface;

a1, A2, A3, A4-angle;

c1-a central line;

c2-optical axis;

d1, D2-distance;

p1-a first moiety;

p2-a second moiety;

t1-thickness;

x-a first direction;

y-a second direction;

z-normal direction.

Detailed Description

Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.

Certain terms are used throughout the description and following claims to refer to particular components. Those skilled in the art will appreciate that electronic device manufacturers may refer to a component by different names. It is not intended to distinguish between components that differ in function but not name. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to …".

Directional terms mentioned herein, such as: "upper", "lower", "front", "rear", "left", "right", etc., are merely directions with reference to the drawings. Thus, directional terminology is used for purposes of illustration and is not intended to be limiting of the disclosure. In the drawings, the various drawings depict general features of methods, structures and/or materials used in particular embodiments. However, these drawings should not be construed as defining or limiting the scope or nature of what is covered by these embodiments. For example, the relative dimensions, thicknesses, and locations of various layers, regions, and/or structures may be reduced or exaggerated for clarity.

The disclosure describes a structure (or layer, component, substrate) on/over another structure (or layer, component, substrate) that may refer to two structures being adjacent and directly connected, or that may refer to two structures being adjacent and not directly connected. Indirect connection refers to having at least one intervening structure (or intervening layers, intervening components, intervening substrates, intervening spaces) between two structures, the lower surface of one structure being adjacent to or directly connected to the upper surface of the intervening structure, and the upper surface of the other structure being adjacent to or directly connected to the lower surface of the intervening structure. The intermediate structure may be a single-layer or multi-layer solid structure or a non-solid structure, and is not limited thereto.

The terms "about," "equal," or "identical," "substantially," or "substantially" are generally interpreted as being within 20% of a given value or range, or as being within 10%, 5%, 3%, 2%, 1%, or 0.5% of the given value or range.

As used in this specification and the appended claims, the use of ordinal numbers such as "first," "second," etc., to modify a component does not by itself connote and indicate any preceding ordinal number of component(s), nor does it indicate the order in which a component is ordered from another component, or the order in which it is manufactured, and the use of ordinal numbers merely serves to distinguish one component having a certain name from another component having a same name. The same words may not be used in the claims and the description, whereby a first element in the description may be a second element in the claims.

In the present disclosure, the distance may be measured by an optical microscope, and the distance may be measured by a cross-sectional image of an electron microscope, but is not limited thereto. In addition, any two values or directions used for comparison may have some error. Furthermore, the terms "a given range of values from a first value to a second value," "a given range falling within a range of values from the first value to the second value," and the like, mean that the given range includes the first value, the second value, and other values therebetween.

It is to be understood that the following exemplary embodiments may be substituted, rearranged, and mixed for the features of several different embodiments to achieve other embodiments without departing from the spirit of the disclosure. Features of the embodiments can be mixed and matched at will without departing from the spirit of the invention or conflicting.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be appreciated that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Fig. 1A is a schematic side view of a dual display device of an embodiment of the present disclosure. Fig. 1B is a schematic perspective view of a light guide plate according to an embodiment of the disclosure.

As shown in fig. 1A and 1B, the dual display apparatus of the present disclosure may include a first panel 10, a second panel 20 disposed opposite to the first panel 10, a light guide plate 30 disposed between the first panel 10 and the second panel 20, and a light source 40 disposed adjacent to the light guide plate 30. The light guide plate 30 may include a main body 301 having a first surface 301a and a second surface 301b, a first pattern 302 disposed on the first surface 301a, and a second pattern 303 disposed on the second surface 301 b; wherein the first pattern 302 is different from the second pattern 303. The double-sided display device of the present disclosure can reduce the number of light guide plates, reflective sheets, or other components by sharing one light guide plate 30, thereby achieving the effects of thinning, light weight, or reducing power consumption. In addition, by designing the first pattern 302 and the second pattern 303 on the light guide plate 30, the light output amounts of the two sides of the light guide plate 30 can be controlled, so that the display panels of the two sides of the light guide plate 30 have different display effects, and the light guide plate can be applied to various fields.

In the present disclosure, the main body portion 301 of the light guide plate 30 includes a first surface 301a and a second surface 301b opposite to the first surface 301a, and a side surface 301c connecting the first surface 301a and the second surface 301b. As shown in fig. 1B, in a top view direction of the light guide plate 30, a coplanar formed by four corners A1, A2, A3, A4 of the light guide plate 30 is defined as a first surface 301a described in the present disclosure; similarly, although not shown in the drawings, a coplanar surface formed by the other four corners of the light guide plate 30 in the bottom view direction of the light guide plate 30 may be defined as the second surface 301b described in the present disclosure. In the present disclosure, as shown in fig. 1A, in a side view, the light guide plate 30 has a center line C1 in a normal direction Z perpendicular to the light guide plate 30 (i.e., in the first direction X), wherein a distance from the center line C1 to the first surface 301A is equal to a distance from the center line C1 to the second surface 301b. Here, the center line C1 is an imaginary reference line, and may extend in a first direction X perpendicular to the normal direction Z of the light guide plate 30, or may be unfolded into a center plane in a second direction Y perpendicular to the normal direction Z of the light guide plate 30.

In the present disclosure, the first pattern 302 and the second pattern 303 may be disposed on the first surface 301a and the second surface 301b, respectively, so that the upper surface and the lower surface of the light guide plate 30 form rough surfaces, which may increase the brightness of the first panel 10 and/or the second panel 20 or improve the display taste. In an embodiment of the present disclosure, the first pattern 302 and the second pattern 303 include a protrusion structure, but the present disclosure is not limited thereto, and in other embodiments of the present disclosure, the first pattern 302 and the second pattern 303 may include a recess structure. The "convex structures" mean that the patterns protrude in directions away from the center line C1 of the light guide plate 30, respectively. The "concave structures" mean that the patterns are respectively depressed toward directions approaching the center line C1 of the light guide plate 30.

In the present disclosure, the "first pattern is different from the second pattern" may mean that the pattern shape, size, arrangement position, density, or combination thereof of the first pattern 302 and the second pattern 303 are different, but the present disclosure is not limited thereto. In an embodiment of the present disclosure, as shown in fig. 1A, the density of the first pattern 302 is different from the density of the second pattern 303, in other words, the density of the first pattern 302 may be greater than the density of the second pattern 303, or the density of the first pattern 302 may be less than the density of the second pattern 303. In an embodiment of the present disclosure, the size of the first pattern 302 is different from the size of the second pattern 303, in other words, the size of the first pattern 302 may be smaller than the size of the second pattern 303, or the size of the first pattern 302 may be larger than the size of the second pattern 303. In an embodiment of the present disclosure, the shape of the first pattern 302 may be different from the shape of the second pattern 303.

In an embodiment of the disclosure, as shown in fig. 1A, the light guide plate 30 may include a first portion P1 and a second portion P2, the first portion P1 is adjacent to the light source 40 than the second portion P2, and the light source 40 is disposed corresponding to the side surface 301c of the main body 301. Wherein the density of the first pattern 302 at the first portion P1 is different from the density of the first pattern 302 at the second portion P2, more specifically, the density of the first pattern 302 at the first portion P1 adjacent to the light source 40 may be smaller than the density of the first pattern 302 at the second portion P2 distant from the light source 40. In the present disclosure, the "density of the pattern" refers to the area occupied by the pattern per unit area in a plan view. In an embodiment of the disclosure, the size of the first pattern 302 at the first portion P1 may be smaller than the size of the first pattern 302 at the second portion P2, so as to improve the uniformity of light emitted from the light guide plate. Furthermore, in an embodiment of the present disclosure, as shown in fig. 1A, the area of the first portion P1 is substantially equal to the area of the second portion P2, but the present disclosure is not limited thereto, and in other embodiments, the area of the first portion P1 may be larger or smaller than the area of the second portion P2.

In the present disclosure, as shown in fig. 1A, the dual-sided display apparatus may further include a first diffusion sheet 11 and a second diffusion sheet 21, wherein the first diffusion sheet 11 is disposed between the first panel 10 and the light guide plate 30, and the second diffusion sheet 21 is disposed between the second panel 20 and the light guide plate 30. Wherein the Haze of the first diffusion sheet 11 and the Haze (Haze) of the second diffusion sheet 21 may be between 90% and 97%, respectivelyAnd the haze of the first diffusion sheet 11 may be the same as or different from the haze of the second diffusion sheet 21. When the haze of the diffusion sheet is too large, the brightness of the display panel is lowered; when the haze of the diffusion sheet is too small, interference fringes such as moire easily occur in the display panel, and display taste is affected. Therefore, when the haze of the diffusion sheet is in the above range, a balance between display taste and brightness can be achieved.

In the present disclosure, the light source 40 may have an optical axis C2 and may extend along a normal direction Z (i.e., along the first direction X) perpendicular to the light guide plate 30. The "optical axis" refers to the center line of the light beam emitted from the light source 40, which is an imaginary reference line. In the present disclosure, a distance D1 between the optical axis C2 and the center line C1 in the normal direction Z of the light guide plate 30 may satisfy the following formula:

0≤D1≤1/4×T1

wherein D1 is the distance between the optical axis and the center line, and T1 is the thickness of the light guide plate. In the present disclosure, the thickness T1 of the light guide plate 30 is a distance between the first surface 301a and the second surface 301b in the normal direction Z of the light guide plate 30.

In an embodiment of the present disclosure, as shown in fig. 1A, the optical axis C2 may overlap with the center line C1 of the light guide plate 30, and thus, the distance D1 between the optical axis C2 and the center line C1 may be 0 micrometers (μm). The light emitting uniformity and/or brightness at two sides of the light guide plate 30 can be adjusted by adjusting the distance D1 between the optical axis C2 and the center line C1, so as to achieve different display effects of the first panel 10 and the second panel 20, and thus the double-sided display device of the present disclosure can be applied to situations where different display effects are required at two sides.

Further, in the present disclosure, the light source 40 and the light guide plate 30 may have a distance D2 therebetween, and more particularly, the distance D2 may refer to a distance between the light source 40 and a side surface of the light guide plate 30 in a direction in which a center line C1 of the light guide plate 30 extends (i.e., in the first direction X), wherein the distance D2 may be between 0.5 millimeters (mm) and 7.7 millimeters (mm) (0.5 millimeters +.d2 +.7.7 millimeters). The hot spot situation (the phenomenon that the light emitted by the light source 40 is excessively concentrated on some parts of the side surface 301c to form obvious uneven brightness) can be improved by adjusting the distance D2 between the light source 40 and the light guide plate 30, so that the uniformity of the light output by the light guide plate 30 is improved.

In the present disclosure, the light source 40 may include a light emitting diode (light emitting diode, LED), which may include, for example, an organic light emitting diode (organic light emitting diode, OLED), a sub-millimeter light emitting diode (mini LED), a micro light emitting diode (micro LED), or a quantum dot LED (QDLED, which may include QLED, QDLED), fluorescence (fluorescence), phosphorescence (phosphorescence), or other suitable materials, or combinations thereof, but the present disclosure is not limited thereto. In the present disclosure, the first panel 10 and the second panel 20 may be any form of display panel requiring a backlight, such as a liquid crystal (liquid crystal) panel, an electro wetting (electrowetting) panel, etc., but are not limited thereto. And the first panel 10 and the second panel 20 may be the same or different forms in the present disclosure, but the present disclosure is not limited thereto.

Fig. 2 is a schematic side view of a dual display device of an embodiment of the present disclosure. Among them, the double-sided display apparatus of fig. 2 is similar to that of fig. 1A and 1B, except for the following differences.

As shown in fig. 2, the first pattern 302 and the second pattern 303 are similar in shape and size, but are disposed differently, and thus, at least a portion of the first pattern 302 and the second pattern 303 may not overlap in the normal direction Z of the light guide plate 30.

Further, the optical axis C2 may not overlap with the center line C1 of the light guide plate 30, and more particularly, the distance D1 between the optical axis C2 and the center line C1 may be greater than 0 micrometers and less than or equal to 1/4 of the thickness of the light guide plate 30. The light emitting uniformity and/or brightness at two sides of the light guide plate 30 can be adjusted by adjusting the distance D1 between the optical axis C2 and the center line C1, so as to realize different display effects of the first panel 10 and the second panel 20.

Fig. 3 is a schematic side view of a dual display device of an embodiment of the present disclosure. Among them, the double-sided display apparatus of fig. 3 is similar to that of fig. 1A and 1B, except for the following differences.

As shown in fig. 3, the light guide plate 30 may include a third pattern 304 disposed on the side surface 301c. The third pattern 304 may be the same as or different from the first pattern 302 and/or the second pattern 303, and the third pattern 304 may be used to improve the hot spot phenomenon, enhance the brightness of the display panel, or enhance the display taste.

Fig. 4 is a schematic side view of a dual display device of an embodiment of the present disclosure. Among them, the double-sided display apparatus of fig. 4 is similar to that of fig. 1A and 1B, except for the following differences.

As shown in fig. 4, the dual display apparatus may further include a third diffusion sheet 31 disposed between the light source 40 and the light guide plate 30, and more particularly, the third diffusion sheet 31 may be disposed on the side surface 301c of the light guide plate 30, thereby improving a hot spot phenomenon, improving brightness of the display panel, or improving display taste. In addition, the haze of the third diffusion sheet 31 may be the same as or different from that of the first diffusion sheet 11 and/or the second diffusion sheet 21, and will not be described again.

Fig. 5A is a schematic side view of a dual display device of an embodiment of the present disclosure. Fig. 5B is a schematic perspective view of a light guide plate according to an embodiment of the disclosure. Fig. 5C is a schematic perspective view of an optical assembly according to an embodiment of the disclosure. Among them, fig. 5A and 5B are similar to fig. 1A and 1B, except for the following differences.

As shown in fig. 5A and 5B, the second pattern 303 may include a first prism structure 3031, where the first prism structure 3031 faces the second panel 20, and more specifically, the first prism structure 3031 may have a plurality of first stripe structures 3031a, where the plurality of first stripe structures 3031a are disposed on the second surface 301B along a first direction X, and the "first prism structure faces the second panel" means that the first stripe structures 3031a are closer to the second panel 20 than the first surface 301 a. In addition, the first stripe structure 3031a may extend along a second direction Y, wherein the second direction Y is perpendicular to the first direction X, and the extending direction of the first prism structure 3031 refers to the extending direction of the first stripe structure 3031a, so in an embodiment of the present disclosure, the extending direction of the first prism structure 3031 may be parallel to the second direction Y. But the present disclosure is not limited thereto. In some embodiments, the extending direction of the first prism structures 3031 may be different but also not perpendicular to the first direction X.

In the present disclosure, as shown in fig. 5A, the dual display apparatus may further include an optical assembly 50 disposed on the second diffusion sheet 21, and more particularly, the optical assembly 50 may be disposed between the second diffusion sheet 21 and the second panel 20, but is not limited thereto. In some embodiments, the second diffusion sheet 21 may be located between the optical assembly 50 and the second panel 20. As shown in fig. 5C, the optical component 50 may have a second prism structure 501, and the second prism structure 501 may have a plurality of second stripe structures 501a and a surface 502 opposite to the plurality of second stripe structures 501a, wherein the second prism structure 501 may face the light guide plate 30 or face the second panel 20, and more specifically, the second stripe structure 501a may be closer to the light guide plate 30 or the second panel 20 than the surface 502. In an embodiment of the present disclosure, the second prism structure 501a may face the second panel 20, but the present disclosure is not limited thereto. In some embodiments, the optical component 50 may be a prism film (prism film), but is not limited thereto.

In addition, the second stripe structure 501a may extend along the first direction X, and the extending direction of the second prism structure 501 refers to the extending direction of the second stripe structure 501a, and thus, the extending direction of the second prism structure 501 may be parallel to the first direction X. In the present disclosure, as shown in fig. 5B and 5C, the extending direction (e.g., the second direction Y) of the first prism structure 3031 is different from the extending direction (e.g., the first direction X) of the second prism structure 501. In an embodiment of the present disclosure, the extending direction (e.g., the second direction Y) of the first prism structure 3031 may be perpendicular to the extending direction (e.g., the first direction X) of the second prism structure 501, for example, but the present disclosure is not limited thereto. In some embodiments, the extending direction of the second prism structure 501 is different from the first direction X and the second direction Y in fig. 5C.

Fig. 6 is a schematic side view of a dual display device of an embodiment of the present disclosure. Among them, the double-sided display apparatus of fig. 6 is similar to that of fig. 1A and 1B, except for the following differences.

As shown in fig. 6, a first optical film set 12 may be optionally included between the first diffusion sheet 11 and the first substrate 10, and the first optical film set 12 may include a brightness enhancement film (Brightness enhancement film), a diffusion film, other optical films, or a combination thereof. In addition, the first optical film set 12 may be formed by assembling single-layer films with different or similar functions, or may be a composite film, and the composite film may have the effects of diffusing, brightening, or concealing, but the disclosure is not limited thereto.

Similarly, a second optical film set 22 may be optionally included between the second diffusion sheet 21 and the second substrate 20, where the second optical film set 22 is similar to the first optical film set 12, and will not be described herein. In addition, the first optical film set 12 and the second optical film set 22 may be the same or different, and the display effects of the first panel 10 and the second panel 20 may be controlled by providing different optical film sets. In an embodiment of the present disclosure, the first optical film set 12 may include a brightness enhancing film 121 and a diffusion film 122 disposed between the first panel 10 and the light guide plate 30, and similarly, the second optical film set 22 may include a brightness enhancing film 221 and a diffusion film 222 disposed between the second panel 20 and the light guide plate 30, but the present disclosure is not limited thereto.

The foregoing detailed description of the embodiments should be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever, and features of different embodiments may be used in combination without conflict.

Claims

1. A dual-sided display device, comprising:

a first panel;

the second panel is arranged opposite to the first panel;

a light guide plate disposed between the first panel and the second panel, wherein the light guide plate comprises:

a main body part comprising a first surface and a second surface;

a first pattern disposed on the first surface; and

a second pattern disposed on the second surface; and

a light source disposed adjacent to the light guide plate;

wherein the first pattern is different from the second pattern.

2. The dual sided display device as claimed in claim 1, wherein at least a portion of the first pattern and the second pattern do not overlap in a normal direction of the light guide plate.

3. The dual sided display device of claim 1, wherein a density of the first pattern is different from a density of the second pattern.

4. The dual sided display device as recited in claim 1, wherein the light guide plate comprises a first portion and a second portion, the first portion being closer to the light source than the second portion, wherein a density of the first pattern in the first portion is different from a density of the first pattern in the second portion.

5. The dual sided display device of claim 1, wherein the light source has an optical axis, the light guide plate has a center line in a normal direction perpendicular to the light guide plate, wherein a distance between the optical axis and the center line satisfies the following formula:

0≤D1≤1/4×T1

wherein D1 is the distance between the optical axis and the center line, and T1 is the thickness of the light guide plate.

6. The dual sided display device of claim 1, wherein a distance between the light source and the light guide plate is between 0.5 millimeters (mm) and 7.7 millimeters (mm).

7. The dual-sided display apparatus of claim 1, further comprising a first diffusion sheet disposed between the first panel and the light guide plate, wherein the first diffusion sheet has a haze of between 90% and 97%.

8. The apparatus of claim 1, wherein the main body comprises a side surface connecting the first surface and the second surface, and the light guide plate comprises a third pattern disposed on the side surface.

9. The dual sided display device of claim 1, wherein the second pattern comprises a first prism structure.

10. The dual-sided display apparatus of claim 9, further comprising a diffusion sheet disposed between the second panel and the light guide plate; and an optical component arranged between the diffusion sheet and the second panel, wherein the optical component is provided with a second prism structure.