CN114822228A

CN114822228A - Display device

Info

Publication number: CN114822228A
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: 2022-07-29
Anticipated expiration: 2041-01-28
Also published as: CN114822228B; JP2022115793A

Abstract

A 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 with the opening. The object, the reflective polarizer and the illumination light 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 of better uniformity of the light source of the illuminating object and higher overall brightness of the display panel.

Description

Display device

Technical Field

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

Background

With the vigorous development of display technology, diversification of life applications is gradually opening another wave of eye revolution. Among them, a product display cabinet or a household refrigerator having a transparent display is a typical example of the recent display technology combined with life. Generally, such display cases or refrigerators are used for setting up a space for articles, and an illumination light source is provided around the space to clearly show the appearance of the articles. However, in order to optimize the display effect of the object, the installation position of the illumination light source will tend to reduce the backlight brightness and uniformity of the transparent display, and vice versa. In addition, the illumination light source can form an illumination blind area due to the arrangement position of the article, and further the display effect of the article is influenced.

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 with the opening. The object, the reflective polarizer and the illumination light source are arranged in the cavity. The reflective polarizer is located between the object and the display panel.

In view of 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 light source are further disposed in the cavity. The illumination light source is used for illuminating an 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 arrangement of the object can be effectively reduced, and the backlight uniformity and the overall brightness of the display panel are improved. From another perspective, the arrangement of the reflective polarizer may also increase the flexibility of the arrangement of the object in the cavity.

In order to make the aforementioned and other features and advantages of the 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 invention.

Fig. 3 is an enlarged schematic view of a partial region 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 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 and other features and advantages of the invention will be apparent from the following detailed description of preferred embodiments, which proceeds with reference to the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

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 communicating 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 to overlap the display area DA (or the opening 100a), for example, the display panel 110 is disposed at one side of the opening 100a of the cavity 100.

More specifically, a viewer (not shown) may stand on a side of the display device 10 where the display panel 110 is disposed, and see through the display panel 110 to see through 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 (PDLC) display panel, or another suitable transparent display panel.

In the present embodiment, the illumination source 120 is disposed in the cavity 100 on a side 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 source 120 has a light source emitting surface 120s facing the object OBJ and the display panel 110, and the light source emitting surface 120s of the illumination 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 emitting surface 120s of the illumination light source 120 faces the display panel 110, and can provide a backlight with higher brightness for the display panel 110.

For example, the illumination light source 120 may include a plurality of Light Emitting Diode (LED) elements (not shown), and the LED elements may be arranged in an array on the light source emitting surface 120s of the illumination light source 120, but is not limited thereto. In other embodiments, the illumination source 120 may also 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-LED) panel or a sub-millimeter light emitting diode (mini-LED) panel may also be used as the illumination light source 120 of the display device.

In the present embodiment, the object OBJ is, for example, a non-transparent (or non-transparent) pop can, and is disposed on the 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, or a toy. 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 emitting surface 120s of the illumination light source 120, or the projection area of the object OBJ on the light source emitting surface 120s is smaller than the light source emitting surface 120 s. It should be noted that, the number of the objects OBJ in the embodiment is exemplarily illustrated by taking one example, which does not mean that the invention is limited thereto, and in other embodiments, the number of the objects OBJ in the display device may also be adjusted according to actual application requirements.

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 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. Specifically, 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 is used for reflecting (or partially reflecting) a light beam having the second polarization state P2. It should be understood that, in order to maximize the light energy utilization of the illumination light source 120, the axial direction of the transmission axis T of the reflective polarizer 130 may be selectively parallel to the axial direction of the transmission axis of a polarizer (not shown) on the side of the display panel 110 facing the reflective polarizer 130, and by the stacked arrangement of the polarizer of the display panel 110 and the reflective polarizer 130, the display quality (e.g., contrast) of the display panel 110 may be maintained, and the illumination effect of the object OBJ may be further improved, but the invention is not limited thereto. 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 influence on the display effect of the display panel 110 is neglected (e.g., cost considerations).

Specifically, in the present embodiment, the light beam LB directly irradiating the reflective polarizer 130 may have a light beam component with the first polarization state P1 passing through the reflective polarizer 130 to form the first sub-light beam LBa with linear polarization (the first polarization state P1). And the other beam component with the second polarization state P2 is reflected by the reflective polarizer 130 to form a second sub-beam LBb with linear polarization (the second polarization state P2), and is transmitted to the surface of the object OBJ opposite to the illumination light source 120. It should be noted that the second sub-beam LBb can form a plurality of scattered beams having non-polarization states (e.g. having both the first polarization state P1 and the second polarization state P2) after illuminating the object OBJ. The scattered light beams pass through the reflective polarizer 130 to form scattered sub-light beams (e.g., the scattered sub-light beam LBb1 and the scattered sub-light beam LBb2) having the first polarization state P1, and pass through the display panel 110 to be perceived by human eyes. On the other hand, a scattered sub-beam (not shown) having the second polarization state P2 formed after the scattered light beam is reflected by the reflective polarizer 130 may be transmitted to the surface of the object OBJ opposite to the illumination light source 120 again.

Specifically, since the illumination source 120 of the 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 an 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, part of the light beam LB directly irradiating the reflective polarizer 130 can be reflected into the illumination blind area BA, which is helpful for improving the display effect (or the display quality) of the object OBJ. In other words, the reflective polarizer 130 is disposed on a side of the object OBJ close to 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 object OBJ, and the flexibility of disposing the object OBJ in the cavity 100 is increased. Meanwhile, the arrangement of the reflective polarizer 130 may also reuse the light beam that would be absorbed by the polarizer on the side of the reflective polarizer 130 facing the display panel 110, so as to improve the backlight uniformity and the overall brightness of the display panel 110.

The present disclosure will be described in detail below with reference to other embodiments, wherein like components are denoted by like reference numerals, and descriptions of the same technical contents are omitted, and detailed descriptions thereof are omitted.

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 region 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 device is different. 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 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, that is, the reflective polarizer 130 is disposed between the backlight module 140 and the display panel 110. That is, a part of the light beams emitted by the illumination light source 120 can also 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 an exit surface 142a facing the opening 100Aa of the cavity 100A and an incident surface 142b connected to the exit surface 142a, and the light source 141 is disposed at one side of the incident 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 emitted through the light emitting surface 142a of the light guide plate 142. And exits from the display area DA' of the display device 11 after passing through the display panel 110.

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 plurality of optical microstructures MS are distributed to be gradually dense from the light incident surface 142b to 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 142 b. It should be noted that, in the 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 emitted from the bottom surface 142c of the light guide plate 142 after passing through the light guide plate 142. The light beam passes through the reflective polarizer 130 and then serves as an illumination beam of the object OBJ, which helps to further reduce the illumination dead zone BA formed by the illumination light source 120 due to the object OBJ.

Fig. 5 is a schematic side view of a display device according to a fourth embodiment of the 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 embodiment, the cavity 100B has an inner surface 100s1 and an inner surface 100s2 defining the receiving space SP and facing each other, wherein the object OBJ and the illumination source 120A are respectively disposed on the inner surfaces 100s1 and 100s2 of the cavity 100B, and the extending direction of the light source emitting surface 120s (e.g., parallel to the inner surface 100s2) of the illumination source 120A intersects the display surface DS of the display panel 110. Accordingly, the illumination blind area BA formed by the illumination light source 120 of fig. 4 due to the shielding of the object OBJ 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 ' from the light source 141 and transmitted through the light guide plate 142 forms a sub-light beam LB ' a (transmitted) having the first polarization state P1 and a sub-light beam LB ' b (reflected) having the second polarization state P2 after being transmitted to the reflective polarizer 130. The sub-beam LB ' a with the first polarization state P1 exits from the display area DA ' of the display device 13 after passing through the reflective polarizer 130 and the display panel 110 (for example, the display device 13 displays white pictures, transparent pictures or non-black pictures), and the sub-beam LB ' B with the second polarization state P2 is transmitted toward the object OBJ or the inner surface of the cavity 100B on the side away from the display panel 110 (for example, the inner surface 100s1 or the other inner surface 100s3 connected to the inner surface 100s 1) after being reflected by the reflective polarizer 130. Accordingly, compared to the display device 11 of fig. 2, the display device 13 of the present embodiment can provide better backlight uniformity for the display panel 110, and the display effect (or the display quality) of the object OBJ is better.

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 light source 120A, reference may be made to the related paragraphs of the foregoing embodiments for a detailed description of the transmission manner of the light beam LB in the display device 13 and the technical effects thereof, and thus, the detailed description will not be repeated 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 device is different. In the present embodiment, the display device 14 further includes a substrate 150 and an anti-reflection 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-reflection film 160 are respectively disposed on the first surface 150a and the second surface 150b of the substrate 150. Therefore, 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 also directly irradiate the anti-reflection film 160 on the substrate 150.

In particular, the substrate 150 is beneficial to increase the overall flatness of the reflective polarizer 130, thereby preventing the poor light splitting efficiency of the reflective polarizer 130 caused by the deflection of the film surface. On the other hand, by disposing the anti-reflection film 160 on the second surface 150b of the substrate 150, the total reflection of the light beam on the second surface 150b of the substrate 150 can be effectively reduced, and the ghost phenomenon of the object OBJ due to the substrate 150 can be eliminated. For example, the anti-reflection film 160 may be a single or multi-layer stacked 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 difference between the display device 15 of the present embodiment and the display device 13 of fig. 5 is: the composition of the display device is different. 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 can also cover two inner surfaces (not shown) of the cavity 100B connecting the inner surface 100s1 and the inner surface 100s3, and the two inner surfaces are respectively located at two opposite sides of the inner surfaces 100s1 and 100s 3. 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, the portion not shielded by the illumination light source 120A.

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

Particularly, 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, even 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, and the poor light splitting efficiency of the reflective polarizer 130 caused by the deflection of the film surface can be avoided.

In summary, in the display device of an embodiment of the invention, the display panel is disposed at the opening of the cavity, and the object and the illumination light source are disposed in the cavity. The illumination light source is used for illuminating an 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 arrangement of the object can be effectively reduced, and the backlight uniformity and the overall brightness of the display panel are improved. From another perspective, the arrangement of the reflective polarizer may also increase the flexibility of the arrangement of the object in the cavity.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

List of reference numerals

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

100. 100A, 100B: cavity body

100a, 100 Aa: opening of the container

100s1, 100s2, 100s 3: inner surface

110: display panel

120. 120A, 120B: illumination light source

120 s: light source light emitting surface

130: reflective polarizer

140. 140A: backlight module

141: light source

142: light guide plate

142 a: light emitting surface

142 b: light incident surface

142 c: bottom surface

150: substrate

150 a: first surface

150 b: second surface

160: anti-reflection film

170: reflector plate

BA: illumination blind area

DA. DA': display area

And (2) DS: display surface

LB and LB': light beam

LBa: first sub-beam

LBb: second sub-beam

LBb1, LBb 2: scattered sub-beams

LB 'a, LB' b: sub-beams

MS: optical microstructure

And (3) OBJ: article

P1: a first polarization state

P2: second polarization state

SP: containing space

T: penetrating the shaft.

Claims

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

the cavity has an opening;

the display panel is arranged in the opening in an overlapping mode;

the object is arranged in the cavity;

the reflective polarizer is arranged in the cavity and is positioned between the object and the display panel; and

the illumination light source is arranged in the cavity.

2. The display device of claim 1, wherein a portion of the beam of the illumination source is used to directly illuminate the object and another portion of the beam of the illumination source is used to directly illuminate the reflective polarizer.

3. The display device of claim 1, wherein the illumination source is configured 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 that is axially parallel to a polarization direction of the first polarization state, and configured to reflect the light beam having the second polarization state.

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

a backlight module disposed in the cavity and located between the display panel and the object, the backlight module comprising:

the light guide plate is provided with a light emergent surface facing the opening and a light incident surface connected with the light emergent surface; and

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

5. The display device of claim 4, wherein the reflective polarizer is disposed between the light guide plate and the display panel.

6. The display device of claim 4, wherein the reflective polarizer is disposed between the light guide plate and the object.

7. The display device as claimed in claim 4, wherein the light guide plate further has a plurality of optical microstructures disposed on a bottom surface, and the bottom surface is disposed opposite to the light exit surface and connected to the light entrance surface.

8. The display device as claimed in claim 1, wherein the display panel has a display surface, the illumination source has a light source emitting surface facing the object, and the light source emitting surface of the illumination source is parallel to the display surface of the display panel.

9. The display device as claimed in claim 1, wherein the display panel has a display surface, the illumination source has a light source emitting surface facing the object, and the light source emitting surface of the illumination source intersects the display surface of the display panel.

10. 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.

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

the reflector plate is arranged on at least one inner surface of the cavity facing the object.