CN114822228B

CN114822228B - Display device

Info

Publication number: CN114822228B
Application number: CN202110115860.XA
Authority: CN
Inventors: 刘劲谷; 吴中豪; 李信宏
Original assignee: Champ Vision Display Inc
Current assignee: Champ Vision Display Inc
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2024-03-19
Anticipated expiration: 2041-01-28
Also published as: JP2022115793A; CN114822228A

Abstract

A display device includes a cavity, a display panel, an object, and an illumination source. The cavity has an opening. The display panel is overlapped and arranged on the opening. The object, the reflective polarizer and the illumination source are arranged in the cavity. The reflective polarizer is located between the object and the display panel. The display device provided by the invention has the effects that the uniformity of the light source for illuminating the object is better, and the overall brightness of the display panel is higher.

Description

Display device

Technical Field

The present invention relates to a display device, and more particularly, to a display device with a physical display function.

Background

Along with the vigorous development of display technology, the diversification of living applications is gradually opening another eyeball revolution. Among them, a commodity showcase or a home refrigerator equipped with a transparent display is a typical example of a combination of display technologies and living applications in recent years. Generally, such showcases or refrigerators are used for providing a space for placing articles, and an illumination light source is provided around the showcase or refrigerator to clearly show the appearance of the articles. However, in order to optimize the display of the article, the mounting location of the illumination source tends to reduce the backlight brightness and uniformity of the transparent display, and vice versa. In addition, the illumination light source can also form illumination blind areas because of the arrangement positions of the articles, so that the display effect of the articles is affected.

Disclosure of Invention

The invention provides a display device which is used for illuminating an object and has better light source uniformity and higher overall brightness of a display panel.

The display device comprises a cavity, a display panel, an object and an illumination light source. The cavity has an opening. The display panel is overlapped and arranged on the opening. The object, the reflective polarizer and the illumination source are arranged in the cavity. The reflective polarizer is located between the object and the display panel.

Based on the above, in the display device according to an embodiment of the invention, the display panel is disposed at the opening of the cavity, and the object and the illumination source are further disposed in the cavity. The illumination source is used for illuminating the object and is used as a backlight source of the display panel. By arranging the reflective polarizer between the display panel and the object, the lighting blind area of the lighting source formed by the object can be effectively reduced, and the backlight uniformity and the overall brightness of the display panel can be improved. From another point of view, the placement of the reflective polarizer may also increase the flexibility of placement of the object within the cavity.

In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic side view of a display device according to a first embodiment of the present invention.

Fig. 2 is a schematic side view of a display device according to a second embodiment of the present invention.

Fig. 3 is an enlarged schematic view of a partial area of the display device of fig. 2.

Fig. 4 is a schematic side view of a display device according to a third embodiment of the present invention.

Fig. 5 is a schematic side view of a display device according to a fourth embodiment of the present invention.

Fig. 6 is a schematic side view of a display device according to a fifth embodiment of the present invention.

Fig. 7 is a schematic side view of a display device according to a sixth embodiment of the present invention.

Detailed Description

The foregoing and other technical aspects, features and advantages of the present invention will become more apparent from the following detailed description of a preferred embodiment, which proceeds with reference to the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, the directional terminology is used for purposes of illustration and is not intended to be limiting of the invention.

Fig. 1 is a schematic side view of a display device according to a first embodiment of the present invention. Referring to fig. 1, the display device 10 includes a cavity 100, a display panel 110, an illumination source 120, an object OBJ, and a reflective polarizer 130. The cavity 100 has an opening 100a and a receiving space SP communicated with the opening 100a, and the illumination source 120 and the object OBJ are disposed in the receiving space SP of the cavity 100. Specifically, the opening 100a of the cavity 100 may define a display area DA of the display device 10, and the display panel 110 is disposed in the display area DA (or the opening 100 a) in an overlapping manner, and the display panel 110 is disposed at one side of the opening 100a of the cavity 100, for example.

More specifically, an observer (not shown) may stand on the side of the display device 10 provided with the display panel 110, and see through the display panel 110 to the object OBJ located in the cavity 100. Accordingly, the display panel 110 is, for example, a transmissive liquid crystal panel, a polymer dispersed liquid crystal (polymer dispersed liquid crystal, PDLC) display panel, or other suitable transparent display panel.

In the present embodiment, the illumination source 120 is disposed in the cavity 100 and opposite to the display panel 110, and the object OBJ is located between the display panel 110 and the illumination source 120. In detail, the display panel 110 has a display surface DS, the illumination light source 120 has a light source light emitting surface 120s facing the object OBJ and the display panel 110, and the light source light emitting surface 120s of the illumination light source 120 may be parallel to the display surface DS of the display panel 110, but the invention is not limited thereto. Thus, the light source light emitting surface 120s of the illumination light source 120 faces the display panel 110, and a backlight with higher brightness of the display panel 110 can be provided.

For example, the illumination light source 120 may include a plurality of light emitting diode (light emitting diode, LED) elements, which are not shown, and the light emitting diode elements may be arrayed on the light source light emitting surface 120s of the illumination light source 120, but is not limited thereto. In other embodiments, the illumination source 120 may be a light box, an assembly of a plurality of LED light bars, or a combination of LED light bars and a light guide plate. It should be noted that in some embodiments, a micro light emitting diode (micro light emitting diode, micro-LED) panel or a sub-millimeter light emitting diode (mini light emitting diode, mini-LED) panel may also be used as the illumination source 120 of the display device.

In this embodiment, the object OBJ is, for example, an opaque (or non-transparent) pop can, and is disposed on an inner surface 100s1 of the cavity 100 defining the accommodating space SP. However, the invention is not limited thereto, and according to other embodiments, the object OBJ may also be a transparent, or partially transparent, commodity, such as a pet bottle, a plastic box, a carton, a toy, or the like. It should be noted that, in the arrangement direction of the display panel 110, the object OBJ and the illumination light source 120, the object OBJ partially overlaps the display surface DS of the display panel 110 and the light source light-emitting surface 120s of the illumination light source 120, or the projection area of the object OBJ on the light source light-emitting surface 120s is smaller than the light source light-emitting surface 120s. It should be noted that, the number of the objects OBJ in the present embodiment is exemplified by one example, and the present invention is not limited thereto, and in other embodiments, the number of the objects OBJ placed in the display device may be adjusted according to the actual application requirement.

Further, the reflective polarizer 130 of the display device 10 is disposed in the cavity 100 and between the object OBJ and the display panel 110. In the present embodiment, the illumination light source 120 is configured to emit a plurality of light beams LB, one portion of the light beams LB is configured to directly illuminate the object OBJ, and the other portion of the light beams LB is configured to directly illuminate the reflective polarizer 130, but is not limited thereto. It is specifically described that the light beam LB is unpolarized light or natural light, that is, the light beam LB has a first polarization state P1 and a second polarization state P2, and the first polarization state P1 is orthogonal to the second polarization state P2.

On the other hand, the reflective polarizer 130 has a transmission axis T axially parallel to the polarization direction of the first polarization state P1, and serves to reflect (or partially reflect) the light beam having the second polarization state P2. It should be understood that, in order to maximize the light energy utilization rate of the illumination light source 120, the transmission axis T of the reflective polarizer 130 may be selectively parallel to the transmission axis of a polarizer (not shown) on the side of the display panel 110 facing the reflective polarizer 130, and by the above-mentioned lamination arrangement of the polarizer of the display panel 110 and the reflective polarizer 130, the display quality (such as contrast) of the display panel 110 may be maintained, and the illumination effect of the object OBJ may be further improved. In other embodiments, the reflective polarizer 130 may replace the polarizer on the side of the display panel 110 facing the illumination source 120 if the effect on the display effect of the display panel 110 is ignored (e.g., cost consideration).

Specifically, in the present embodiment, the light beam LB of the reflective polarizer 130 is directly irradiated, and the light beam component having the first polarization state P1 may pass through the reflective polarizer 130 to form the first sub-light beam LBa of the linear polarization (the first polarization state P1). And the other beam component having the second polarization state P2 is reflected by the reflective polarizer 130 to form a second sub-beam LBb having a linear polarization (second polarization state P2), and transmitted to the surface of the object OBJ on the side of the illumination source 120. It is noted that the second sub-beam LBb may form a plurality of scattered beams having non-polarized states (e.g. having both the first polarized state P1 and the second polarized state P2) after illuminating the object OBJ. The scattered light beams herein form scattered sub-beams (e.g., scattered sub-beams LBb1 and scattered sub-beams LBb 2) having the first polarization state P1 after passing through the reflective polarizer 130, and are visualized by human eyes through the display panel 110. On the other hand, the scattered sub-beams (not shown) having the second polarization state P2 formed by the scattered beams after being reflected by the reflective polarizer 130 may be transmitted to the surface of the object OBJ on the side of the illumination source 120 again.

Specifically, since the illumination source 120 of the present embodiment is disposed on the side of the opaque object OBJ away from the display panel 110, the side of the object OBJ away from the illumination source 120 forms the illumination blind area BA of the illumination source 120 (i.e. cannot be directly illuminated by the illumination source 120). By disposing the reflective polarizer 130 between the display panel 110 and the object OBJ, a portion of the light beam LB directly illuminating the reflective polarizer 130 is reflected into the illumination blind area BA, which is helpful for improving the display effect (or quality) of the object OBJ. In other words, the reflective polarizer 130 is disposed on the object OBJ near the illumination blind area BA, so that the illumination beam can effectively cover the illumination blind area BA formed by the illumination light source 120 due to the placement of the object OBJ, and the flexibility of the object OBJ in the cavity 100 is increased. Meanwhile, the reflective polarizer 130 can reuse the light beam absorbed by the polarizer of the display panel 110 facing the reflective polarizer 130, so that the backlight uniformity and the overall brightness of the display panel 110 can be improved.

Other embodiments will be listed below to describe the present disclosure in detail, wherein like components will be denoted by like reference numerals, and descriptions of the same technical content will be omitted, and reference is made to the foregoing embodiments for parts, which will not be repeated below.

Fig. 2 is a schematic side view of a display device according to a second embodiment of the present invention. Fig. 3 is an enlarged schematic view of a partial area of the display device of fig. 2. Fig. 4 is a schematic side view of a display device according to a third embodiment of the present invention.

Referring to fig. 2, the display device 11 of the present embodiment is different from the display device of fig. 1 in that: the composition of the display devices varies. Specifically, the display device 11 further includes a backlight module 140 disposed in the cavity 100A, and the backlight module 140 is located between the object OBJ and the display panel 110. In the present embodiment, the backlight module 140 is disposed between the display panel 110 and the reflective polarizer 130. That is, the reflective polarizer 130 is disposed between the object OBJ and the backlight module 140. However, the present invention is not limited thereto, and according to other embodiments, as shown in fig. 4, the backlight module 140A of the display device 12 may also be disposed between the object OBJ and the reflective polarizer 130, i.e. the reflective polarizer 130 is disposed between the backlight module 140 and the display panel 110. That is, a portion of the light beam emitted from the illumination light source 120 can directly illuminate the light guide plate 142 of the backlight module 140A.

Referring to fig. 2, the backlight module 140 includes a light source 141 and a light guide plate 142. The light guide plate 142 has a light exit surface 142a facing the opening 100Aa of the cavity 100A and a light entrance surface 142b connected to the light exit surface 142a, and the light source 141 is disposed on one side of the light entrance surface 142b of the light guide plate 142. For example, the light source 141 of the backlight module 140 is configured to emit a light beam LB 'toward the light incident surface 142b of the light guide plate 142, and the light beam LB' is transmitted in the light guide plate 142 and is emitted through the light emitting surface 142a of the light guide plate 142. After passing through the display panel 110, it exits from the display area DA' of the display device 11.

Referring to fig. 2 and fig. 3, the light guide plate 142 further has a plurality of optical microstructures MS disposed on the bottom surface 142c for uniformly emitting the light beam LB' from the light emitting surface 142a, for example, in an embodiment, the distribution of the plurality of optical microstructures MS is gradually dense from the light incident surface 142b toward a direction away from the light incident surface 142b, wherein the bottom surface 142c is disposed opposite to the light emitting surface 142a and is connected to the light incident surface 142b. It should be noted that, in the present embodiment, the backlight uniformity and the overall brightness of the display panel 110 can be further improved by the arrangement of the backlight module 140. On the other hand, a part of the light beam (not shown) from the light source 141 is transmitted through the light guide plate 142 and then exits from the bottom surface 142c of the light guide plate 142. This portion of the light beam after passing through the reflective polarizer 130 can also be used as an illumination beam of the object OBJ, which helps to further reduce the illumination blind area BA of the illumination source 120 due to the decoration of the object OBJ.

Fig. 5 is a schematic side view of a display device according to a fourth embodiment of the present invention. Referring to fig. 5, the display device 13 of the present embodiment is different from the display device 12 of fig. 4 in that: the illumination sources are arranged differently. In the present embodiment, the cavity 100B has an inner surface 100s1 and an inner surface 100s2 defining the accommodating space SP and facing each other, wherein the object OBJ and the illumination source 120A are disposed on the inner surface 100s1 and the inner surface 100s2 of the cavity 100B, respectively, and an extending direction of the light source light emitting surface 120s (e.g. parallel to the inner surface 100s 2) of the illumination source 120A intersects the display surface DS of the display panel 110. Accordingly, the illumination blind area BA formed by the shielding of the object OBJ by the illumination light source 120 as shown in fig. 4 can be effectively avoided.

On the other hand, since the backlight module 140A is disposed between the reflective polarizer 130 and the object OBJ, the light beam LB ' transmitted from the light source 141 through the light guide plate 142 forms the sub-light beam LB ' a (penetrating) having the first polarization state P1 and the sub-light beam LB ' b (reflecting) having the second polarization state P2 after being transmitted to the reflective polarizer 130. The sub-beam LB ' a having the first polarization state P1 is emitted from the display area DA ' of the display device 13 after passing through the reflective polarizer 130 and the display panel 110 (e.g. the display device 13 is displaying a white picture, a transparent display or a non-black picture), and the sub-beam LB ' B having the second polarization state P2 is transmitted toward an inner surface (e.g. the inner surface 100s1 or another inner surface 100s3 connected to the inner surface 100s 1) of the object OBJ or the cavity 100B on a side away from the display panel 110 after being reflected by the reflective polarizer 130. Accordingly, the display device 13 of the present embodiment can provide better backlight uniformity for the display panel 110 and better display effect (or display quality) of the object OBJ compared to the display device 11 of fig. 2.

Since the reflective polarizer 130 of the present embodiment functions similarly to the display device 10 of fig. 1 for the light beam LB from the illumination source 120A, there is a detailed description of the transmission manner of Guan Guangshu LB in the display device 13 and the technical effects thereof, and the related paragraphs of the foregoing embodiment are omitted here.

Fig. 6 is a schematic side view of a display device according to a fifth embodiment of the present invention. Referring to fig. 6, the display device 14 of the present embodiment is different from the display device 10 of fig. 1 in that: the composition of the display devices varies. In this embodiment, the display device 14 further includes a substrate 150 and an anti-reflective film 160. The substrate 150 has a first surface 150a and a second surface 150b opposite to each other, and the reflective polarizer 130 and the anti-reflective film 160 are disposed on the first surface 150a and the second surface 150b of the substrate 150, respectively. Also, in the present embodiment, the second surface 150b of the substrate 150 faces the illumination light source 120, and a part of the light beam emitted by the illumination light source 120 can directly irradiate the anti-reflection film 160 on the substrate 150.

Particularly, by the arrangement of the substrate 150, the overall flatness of the reflective polarizer 130 is increased, so as to avoid poor light splitting efficiency of the reflective polarizer 130 due to surface deflection. On the other hand, by disposing the anti-reflection film 160 on the second surface 150b of the substrate 150, total reflection of the light beam on the second surface 150b of the substrate 150 can be effectively reduced, so as to eliminate the ghost phenomenon of the object OBJ due to the substrate 150. For example, the anti-reflection film 160 may be a single-layered or multi-layered stacked refractive index matching layer (index matching layer), but is not limited thereto.

Fig. 7 is a schematic side view of a display device according to a sixth embodiment of the present invention. Referring to fig. 7, the display device 15 of the present embodiment is different from the display device 13 of fig. 5 in that: the composition of the display devices varies. Specifically, the display device 15 further includes a reflective sheet 170 disposed on at least one inner surface of the cavity 100B facing the object OBJ. In the present embodiment, the reflective sheet 170 may cover the inner surface 100s1 and the inner surface 100s3 of the cavity 100B. It should be understood that the reflective sheet 170 may also cover two inner surfaces (not shown) of the cavity 100B connecting the inner surfaces 100s1 and 100s3, and the two inner surfaces are located on opposite sides of the inner surfaces 100s1 and 100s3, respectively. However, the present invention is not limited thereto, and in other embodiments, the reflective sheet 170 may also cover the inner surface 100s2 of the cavity 100B provided with the illumination light source 120A, particularly, a portion not shielded by the illumination light source 120A.

In the present embodiment, the reflection sheet 170 is, for example, a white reflection sheet or a silver reflection sheet, but the present invention is not limited thereto. In other embodiments, the reflective material may also be directly coated on the inner surface of the cavity as a reflective sheet. In another embodiment, the cavity of the display device may also be made of a material with high reflectivity to achieve a technical effect similar to the reflective sheet 170.

It is noted that the reflective polarizer 130 may also be integrated into the backlight module 140, for example, the reflective polarizer 130 is directly disposed on the light guide plate 142. Therefore, in the case that the display device is not provided with the substrate 150 of fig. 6, the overall flatness of the reflective polarizer 130 can be increased, so as to avoid poor light splitting efficiency of the reflective polarizer 130 due to film surface deflection.

In summary, in the display device according to an embodiment of the invention, the display panel is disposed at the opening of the cavity, and the object and the illumination source are disposed in the cavity. The illumination source is used for illuminating the object and is used as a backlight source of the display panel. By arranging the reflective polarizer between the display panel and the object, the lighting blind area of the lighting source formed by the object can be effectively reduced, and the backlight uniformity and the overall brightness of the display panel can be improved. From another point of view, the placement of the reflective polarizer may also increase the flexibility of placement of the object within the cavity.

Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, but rather may be modified or altered somewhat by persons skilled in the art without departing from the spirit and scope of the invention.

List of reference numerals

10. 11, 12, 13, 14, 15: display device

100. 100A, 100B: cavity body

100a, 100Aa: an opening

100s1, 100s2, 100s3: inner surface

110: display panel

120. 120A, 120B: lighting source

120s: light source light-emitting surface

130: reflective polarizer

140. 140A: backlight module

141: light source

142: light guide plate

142a: light-emitting surface

142b: light incident surface

142c: bottom surface

150: substrate board

150a: a first surface

150b: a second surface

160: antireflection film

170: reflection sheet

BA: illumination blind area

DA. DA': display area

DS: display surface

LB, LB': light beam

LBa: first sub-beam

LBb: second sub-beam

LBb1, LBb2: scattered sub-beam

LB 'a, LB' b: sub-beams

MS: optical microstructure

OBJ: article (B)

P1: first polarization state

P2: second polarization state

SP: accommodating space

T: penetrating the shaft.

Claims

1. A display device comprises a cavity, a display panel, an object, a backlight module, a reflective polarizer and an illumination light source,

the cavity is provided with an opening;

the display panel is overlapped and arranged on the opening;

the object is arranged in the cavity;

the backlight module is arranged in the cavity and is positioned between the display panel and the object, and the backlight module comprises:

the light guide plate is provided with a light emitting surface facing the opening and a light entering surface connected with the light emitting surface; and

the light source is arranged on one side of the light incident surface of the light guide plate;

the reflective polarizer is arranged in the cavity, is positioned between the object and the display panel and is arranged between the light guide plate and the display panel; and

the illumination light source is arranged in the cavity, wherein one part of light beams of the illumination light source are used for irradiating the object, and the other part of light beams of the illumination light source are used for directly irradiating the light guide plate of the backlight module.

2. The display device of claim 1, wherein the illumination source is to emit a light beam toward the reflective polarizer, the light beam having a first polarization state and a second polarization state, the first polarization state being orthogonal to the second polarization state, the reflective polarizer having a transmission axis axially parallel to a polarization direction of the first polarization state, and to reflect the light beam having the second polarization state.

3. The display device of claim 1, wherein the display panel has a display surface, the illumination light source has a light source light exit surface toward the object, and the light source light exit surface of the illumination light source is parallel to the display surface of the display panel.

4. The display device of claim 1, wherein the display panel has a display surface, the illumination light source has a light source light-emitting surface facing the object, and an extending direction of the light source light-emitting surface of the illumination light source intersects the display surface of the display panel.

5. The display device of claim 1, further comprising:

the substrate is provided with a first surface and a second surface which are opposite, and the reflective polarizer is arranged on the first surface of the substrate; and

an anti-reflection film disposed on the second surface of the substrate.

6. The display device of claim 1, further comprising:

the reflecting sheet is arranged on at least one inner surface of the cavity facing the object.