TWI839771B - Display apparatus - Google Patents

Abstract

A display apparatus including a backlight module, a display panel, a camera module and an electrically controlled diffusion layer is provided. The backlight module is provided with a light emitting surface. The display panel is disposed on one side of the light emitting surface of the backlight module, and is provided with a display area. The camera module overlaps the display area, and is located on one side of the backlight module away from the display panel. The electrically controlled diffusion layer is disposed between the camera module and the display panel, and overlaps a light receiving surface of the camera module.

Description

Display device

The present invention relates to a display device, and in particular to a display device with a camera module.

In order to increase the screen-to-body ratio of the display and realize a narrow frame design, a display device in which a camera module is set below the display screen has been proposed. Among them, when the display screen is a non-self-luminous display panel (such as a liquid crystal display panel), a backlight module must be installed as an illumination light source. However, due to different light output requirements, the backlight module will generally have some optical microstructures set on the component structure to adjust the light path. Therefore, part of the optical microstructure overlapping with the camera module will also affect the light receiving quality of the camera module when shooting images.

The present invention provides a display device, wherein a camera module under the display panel has better image receiving quality.

The display device of the present invention comprises a backlight module, a display panel, a camera module and an electrically controlled diffusion layer. The backlight module is provided with a light emitting surface. The display panel is arranged on one side of the light emitting surface of the backlight module and is provided with a display area. The camera module is overlapped in the display area and is located on the side of the backlight module away from the display panel. The electrically controlled diffusion layer is arranged between the camera module and the display panel and overlaps the light receiving surface of the camera module.

Based on the above, in a display device of an embodiment of the present invention, a camera module disposed on a side of a backlight module away from a display panel is used to receive external images from a side of the display panel. By disposing an electrically controlled diffusion layer between the camera module and the display panel, the camera module can have good image reception quality when receiving images and has better concealment when turned off.

As used herein, "about", "approximately", "substantially", or "substantially" include the stated value and the average value within an acceptable deviation range of a particular value determined by a person of ordinary skill in the art, taking into account the measurement in question and the specific amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or, for example, within ±30%, ±20%, ±15%, ±10%, ±5%. Furthermore, as used herein, "about", "approximately", "substantially", or "substantially" can select a more acceptable deviation range or standard deviation depending on the measured property, cutting property or other property, and can apply to all properties without using one standard deviation.

In the accompanying drawings, the thickness of layers, films, panels, regions, etc., is exaggerated for clarity. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to another element, or an intermediate element can also exist. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there is no intermediate element. As used herein, "connection" can refer to physical and/or electrical connection. Furthermore, "electrical connection" can be the presence of other elements between two elements.

Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and description to represent the same or similar parts.

FIG. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention. Referring to FIG. 1 , the display device 10 includes a backlight module 100, a display panel 200, and a camera module 300. In the present embodiment, the backlight module 100 includes, for example, a light guide plate 110 and a light source 121. The light guide plate 110 has a light incident surface 110is and a light emitting surface 110es and a bottom surface 110bs connected to the light incident surface 110is and opposite to each other. The light source 121 is disposed on one side of the light incident surface 110is of the light guide plate 110. In the present embodiment, the light emitting surface of the backlight module 100 can be defined by the light emitting surface 110es of the light guide plate 110.

The display panel 200 is disposed on one side of the light emitting surface 110es of the light guide plate 110 (ie, the light emitting surface of the backlight module 100), and a display area DA is disposed on one side of the display surface. In this embodiment, the display panel 200 is, for example, a liquid crystal display panel or other suitable non-self-luminous display panel.

The camera module 300 is overlapped and disposed in the display area DA of the display panel 200 along the normal direction (e.g., direction Z) of the light emitting surface 110es, and is located on the side of the backlight module 100 away from the display panel 200. The camera module 300 is provided with a light receiving surface 300rs facing the display panel 200, and is suitable for receiving light from one side of the display surface and passing through the display panel 200. In other words, the display device 10 is a display device with an under-screen photography function.

Furthermore, the display device 10 further includes an electrically controlled diffusion layer 400, which is disposed between the camera module 300 and the display panel 200, and overlaps the light receiving surface 300rs of the camera module 300 along the direction Z. In the present embodiment, the electrically controlled diffusion layer 400, for example, includes a polymer dispersed liquid crystal film (PDLC film), and is suitable for being electrically controlled to switch between a transparent state and a scattering state. However, the present invention is not limited thereto. In other embodiments, the electrically controlled diffusion layer 400 may also include a polymer network liquid crystal film (PNLC film).

For example, when the camera module 300 is receiving image light, the electrically controlled diffusion layer 400 can operate the transparent state so that the camera module 300 has good image receiving quality. When the camera module 300 is closed, the electrically controlled diffusion layer 400 can switch to the scattering state to effectively reduce the visibility of the camera module 300 on the display side. In other words, the invisibility of the camera module 300 on the display side can be improved.

In this embodiment, a plurality of optical microstructures 115 are further provided on the bottom surface 110bs of the light guide plate 110, and these optical microstructures 115 are suitable for guiding the light from the light source 121 and transmitted laterally in the light guide plate 110 to the light exit surface 110es and out of the light guide plate 110. It is particularly noted that, in order to avoid affecting the light receiving quality of the camera module 300, these optical microstructures 115 do not overlap with the light receiving surface 300rs of the camera module 300 along the normal direction (e.g., direction Z) of the bottom surface 110bs of the light guide plate 110.

In order to meet different light output requirements, the backlight module 100 may further include at least one optical film 150. The optical film 150 is arranged along the normal direction (e.g., direction Z) of the light output surface 110es of the light guide plate 110 to overlap the display area DA of the display panel 200. The optical film 150 is, for example, an optical brightness enhancement film (BEF), a diffuser, or a combination thereof. It is particularly noteworthy that the optical film 150 does not overlap the light receiving surface 300rs of the camera module 300 along the direction Z. Therefore, the light receiving quality of the camera module 300 can be ensured.

Other embodiments are listed below to illustrate the present disclosure in detail, wherein the same components are marked with the same symbols, and the description of the same technical content is omitted. For the omitted parts, please refer to the aforementioned embodiments, which will not be described in detail below.

FIG2 is a cross-sectional schematic diagram of a display device according to a second embodiment of the present invention. Referring to FIG2, compared to the display device 10 of FIG1, the display device 11 of this embodiment may further include an optical auxiliary layer 350. The optical auxiliary layer 350 connects the light emitting surface 110es of the light guide plate 110 and the electrically controlled diffusion layer 400, and does not overlap with the plurality of optical microstructures 115 along the normal direction of the light emitting surface 110es.

In this embodiment, the optical auxiliary layer 350 can be made of cellulose triacetate (TAC), optically clear adhesive (OCA), or other optical grade materials with a refractive index similar to that of the light guide plate 110. In particular, since no optical microstructure 115 is disposed on the bottom surface 110bs of the light guide plate 110 in the area overlapping the light receiving surface 300rs of the camera module 300, by disposing the optical auxiliary layer 350 on the light emitting surface 110es of the light guide plate 110 in the area, the total reflection of the light transmitted in the light guide plate 110 at the light emitting surface 110es in the area can be destroyed. Accordingly, the light extraction efficiency of the portion of the light guide plate 110 where the optical microstructure 115 is not provided (ie, the portion overlapping the camera module 300) can be improved.

FIG3 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention. Referring to FIG3 , the difference between the display device 12 of this embodiment and the display device 11 of FIG2 is only that the number of light sources of the backlight module is different. Specifically, in this embodiment, the backlight module 100A of the display device 12 may also selectively include another light source 122 (i.e., a second light source), and this light source 122 is disposed on a side of the light guide plate 110 away from the light source 121 (i.e., the first light source). In detail, the light guide plate 110 also has another light incident surface 110is″ connecting the light emitting surface 110es and the bottom surface 110bs and opposite to the light incident surface 110is, and a light source 122 is disposed on one side of the light incident surface 110is″ of the light guide plate 110.

It is particularly noted that by disposing another light source 122 on another light incident surface 110is" of the light guide plate 110 adjacent to the camera module 300, the light output of the light guide plate 110 in the area overlapping the camera module 300 can be further increased, which helps to improve the light output uniformity of the light guide plate 110.

Fig. 4 is a cross-sectional schematic diagram of a display device according to a fourth embodiment of the present invention. Referring to Fig. 4, the difference between the display device 13 of this embodiment and the display device 11 of Fig. 2 is that the number of optical auxiliary layers and electrically controlled diffusion layers is different.

Compared to the display device 11 of FIG. 2 , the display device 13 of the present embodiment further includes another electrically-controlled diffusion layer 400″ and another optical auxiliary layer 350″. For example, another electrically-controlled diffusion layer 400″ and another optical auxiliary layer 350″ may be provided on the portion of the bottom surface 110bs of the light guide plate 110 overlapping the camera module 300, and the optical auxiliary layer 350″ connects the bottom surface 110bs of the light guide plate 110 and the electrically-controlled diffusion layer 400″. Similar to the electrically-controlled diffusion layer 400, the electrically-controlled diffusion layer 400″ also overlaps the light-collecting surface 300rs of the camera module 300 along the direction Z.

By disposing another electrically controlled diffusion layer 400 ″, the concealment of the camera module 300 on the display surface side of the display panel 200 can be further improved.

FIG5 is a cross-sectional schematic diagram of a display device according to the fifth embodiment of the present invention. Referring to FIG5, the difference between the display device 20 of this embodiment and the display device 10 of FIG1 is that the type of backlight module is different. Specifically, unlike the backlight module 100 of FIG1 which is a side-light backlight module, the backlight module 100B of this embodiment can also be a direct-type backlight module.

For example, the backlight module 100B may include a carrier 160 and a plurality of light emitting elements 180. The carrier 160 has a surface 160s facing the display panel 200, and the light emitting elements 180 are disposed on the surface 160s of the carrier 160. The light emitting elements 180 each have a light emitting surface 180es facing the display panel 200, and the light emitting surfaces 180es may define the light emitting surface of the backlight module 100B.

It is particularly noted that part of the light emitting elements 180 overlaps the light receiving surface 300rs of the camera module 300 along the normal direction (e.g., direction Z) of the surface 160s. In order to reduce the influence of the light emitting elements 180 on the light receiving effect of the camera module 300, the configuration density of the light emitting elements 180 in the area overlapping the camera module 300 may be different from the configuration density in other areas. For example, any two adjacent light emitting elements 180 in the area on the carrier 160 that do not overlap the camera module 300 have a spacing S1 along the arrangement direction, and any two adjacent light emitting elements 180 in the area on the carrier 160 that overlap the camera module 300 have a spacing S2 along the arrangement direction, and the spacing S2 may be greater than the spacing S1.

The light-emitting elements 180 arranged at a spacing S2 are also overlapped on the electrically controlled diffusion layer 400 along the direction Z, and the electrically controlled diffusion layer 400 is located between the light-emitting elements 180 and the display panel 200. In this embodiment, the optical film 150 is, for example, a diffusion film. In particular, when the camera module 300 is turned off, the electrically controlled diffusion layer 400 operating in the scattering state can also increase the light uniformity of the backlight module 100B in the area overlapping the camera module 300, and reduce the difference in light uniformity with the backlight module 100B in the area overlapping the optical film 150.

In summary, in a display device of an embodiment of the present invention, a camera module disposed on a side of a backlight module away from a display panel is used to receive external images from a side of the display panel. By disposing an electrically controlled diffusion layer between the camera module and the display panel, the camera module can have good image reception quality when receiving images and has better concealment when turned off.

10, 11, 12, 13, 20: display device 100, 100A, 100B: backlight module 110: light guide plate 110bs: bottom surface 110es, 180es: light emitting surface 110is, 110is”: light incident surface 115: optical microstructure 121, 122: light source 150: optical film 160: carrier 160s: surface 180: light emitting element 200: display panel 300: camera module 300rs: light receiving surface 350, 350”: optical auxiliary layer 400, 400”: electrically controlled diffusion layer DA: display area S1, S2: spacing Z: direction

FIG. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of a display device according to a fourth embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of a display device according to a fifth embodiment of the present invention.

10: Display device

100: Backlight module

110: Light guide plate

110bs: bottom surface

110es: light-emitting surface

110is: light-entering surface

115:Optical microstructures

121: Light source

150: Optical film

200: Display panel

300: Camera module

300rs: Polished surface

400:Electrically controlled diffusion layer

DA: Display Area

Z: Direction

Claims (3)

A display device comprises: a backlight module having a light-emitting surface, and comprising: a light guide plate having a light-entering surface, and the light-emitting surface and a bottom surface connected to the light-entering surface and facing each other; a first light source arranged on one side of the light-entering surface of the light guide plate; and at least one optical film, wherein the at least one optical film comprises an optical brightness enhancement film or a diffusion film; a display panel arranged on the light-emitting surface of the backlight module; The backlight module is provided on one side of the backlight module and has a display area; a camera module is overlapped on the display area and is located on the side of the backlight module away from the display panel, the bottom surface of the light guide plate is located between the camera module and the light emitting surface of the light guide plate, wherein the bottom surface of the light guide plate is provided with a plurality of optical microstructures; an electrically controlled diffusion layer is provided between the camera module and the display panel and overlaps a light receiving surface of the camera module; an optical an auxiliary layer connecting the light emitting surface of the light guide plate and the electrically controlled diffusion layer, the optical auxiliary layer not overlapping the optical microstructures; another electrically controlled diffusion layer overlapping the camera module and the electrically controlled diffusion layer, the light guide plate being located between the electrically controlled diffusion layer and the another electrically controlled diffusion layer; another optical auxiliary layer connecting the bottom surface of the light guide plate and the another electrically controlled diffusion layer, the optical auxiliary layer and the another optical auxiliary layer Each of them contains cellulose triacetate or optically transparent adhesive, wherein the optical microstructures do not overlap the electrically controlled diffusion layer, the other electrically controlled diffusion layer, the optical auxiliary layer and the other optical auxiliary layer, and the at least one optical film overlaps the display area of the display panel and does not overlap the light-collecting surface of the camera module, the electrically controlled diffusion layer, the other electrically controlled diffusion layer, the optical auxiliary layer and the other optical auxiliary layer. The display device as described in claim 1, wherein the light guide plate further has another light incident surface connected to the light emitting surface and the bottom surface and opposite to the light incident surface, the backlight module further has a second light source on one side of the other light incident surface of the light guide plate, and the camera module is disposed adjacent to the other light incident surface. A display device as described in claim 1, wherein the electrically controlled diffusion layer includes a polymer dispersed liquid crystal film.

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