TW202403411A - 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 having a camera module.

In order to increase the screen-to-body ratio of the display to achieve a narrow bezel design, a display device is proposed in which a camera module is placed below the display screen. 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 the lighting source. However, due to different light emission requirements, backlight modules usually have some optical microstructures on the composition to adjust the light path. Therefore, some of the optical microstructures that overlap with the camera module will also affect the light collection quality of the camera module when shooting images.

The present invention provides a display device in which a camera module under the display panel has better image reception quality.

The display device of the present invention includes 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 electronically controlled diffusion layer is disposed between the camera module and the display panel, and overlaps the light-collecting surface of the camera module.

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

As used herein, "about," "approximately," "substantially," or "substantially" includes the stated value and an average within an acceptable range of deviations from a particular value as determined by one of ordinary skill in the art, taking into account that Discuss the measurement 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 within ±30%, ±20%, ±15%, ±10%, ±5%, for example. Furthermore, the terms "approximately", "approximately", "substantially" or "substantially" used in this article can be used to select a more acceptable deviation range or standard deviation based on the measurement properties, cutting properties or other properties, and can Not one standard deviation applies to all properties.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. It will 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 the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to physical and/or electrical connection. Furthermore, "electrical connection" can be the presence of other components between the two components.

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numbers are used in the drawings and descriptions to refer to 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 this embodiment, the backlight module 100 includes a light guide plate 110 and a light source 121, for example. The light guide plate 110 has a light incident surface 110is, a light exit surface 110es and a bottom surface 110bs that are connected to the light incident surface 110is and face each other. The light source 121 is provided on one side of the light incident surface 110is of the light guide plate 110 . In this embodiment, the light exit surface of the backlight module 100 can be defined by the light exit surface 110es of the light guide plate 110 .

The display panel 200 is disposed on one side of the light exit surface 110es of the light guide plate 110 (that is, the light exit surface of the backlight module 100), and has a display area DA 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 in the display area DA of the display panel 200 along the normal direction of the light emitting surface 110es (eg, direction Z), 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 adapted to receive light from one side of the display surface and passing through the display panel 200 . That is to say, 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 collecting surface 300rs of the camera module 300 along the direction Z. In this embodiment, the electrically controlled diffusion layer 400 includes, for example, a polymer dispersed liquid crystal film (PDLC film), and is suitable for being electrically controlled to switch to a transparent state or a scattering state. However, the present invention is not limited to this. 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 receives image light, the electronically controlled diffusion layer 400 can operate in the transparent state, so that the camera module 300 has good image reception quality. When the camera module 300 is turned off, the electronically controlled diffusion layer 400 can switch to the scattering state to effectively reduce the visibility of the camera module 300 on one side of the display surface. In other words, the concealment of the camera module 300 on the display surface side can be improved.

In this embodiment, a plurality of optical microstructures 115 are also provided on the bottom surface 110bs of the light guide plate 110, and these optical microstructures 115 are adapted to guide the light from the light source 121 and laterally transmitted in the light guide plate 110 to the light output surface 110es. Exit light guide plate 110. It is particularly important to note that in order to avoid affecting the light-collecting quality of the camera module 300 , these optical microstructures 115 do not overlap with the light-collecting surface of the camera module 300 along the normal direction (such as direction Z) of the bottom surface 110bs of the light guide plate 110 300rs.

In order to meet different light emission requirements, the backlight module 100 may also include at least one optical film 150 . The optical film 150 is disposed overlapping the display area DA of the display panel 200 along the normal direction (eg, direction Z) of the light exit surface 110es of the light guide plate 110 . The optical film 150 is, for example, an optical brightness enhancement film (brightness enhancement film, BEF), a diffuser, or a combination of the above. It is particularly noted 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 collection quality of the camera module 300 can be ensured.

Other embodiments will be enumerated below to describe the present disclosure in detail, in which the same components will be marked with the same symbols, and the description of the same technical content will be omitted. Please refer to the previous embodiments for the omitted parts, which will not be described again below.

FIG. 2 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. Please refer to FIG. 2 . Compared with the display device 10 of FIG. 1 , the display device 11 of this embodiment may further include an optical auxiliary layer 350 . The optical auxiliary layer 350 connects the light exit 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 exit surface 110es.

In this embodiment, the optical auxiliary layer 350 may 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 the bottom surface 110bs of the light guide plate 110 does not have any optical microstructures 115 in the area that overlaps the light-collecting surface 300rs of the camera module 300, the light-emitting surface 110es of the light guide plate 110 in the area passes through. The provision of the optical auxiliary layer 350 can destroy the total reflection of the light transmitted in the light guide plate 110 on the light exit surface 110es in the region. Accordingly, the light extraction efficiency of the light guide plate 110 in the portion where the optical microstructure 115 is not provided (ie, the portion overlapping the camera module 300 ) can be improved.

FIG. 3 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention. Please refer to FIG. 3 . The only difference between the display device 12 of this embodiment and the display device 11 of FIG. 2 is 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 optionally include another light source 122 (ie, the second light source), and this light source 122 is disposed on the light guide plate 110 away from the light source 121 (ie, the second light source). a light source) side. In detail, the light guide plate 110 also has another light incident surface 110is" that connects the light exit surface 110es and the bottom surface 110bs and is opposite to the light incident surface 110is, and the light source 122 is provided on one side of the light incident surface 110is" of the light guide plate 110.

In particular, by arranging another light source 122 on the other light incident surface 110is" of the light guide plate 110 adjacent to the camera module 300, the amount of light emitted by the light guide plate 110 in the area overlapping the camera module 300 can be further increased, which helps To improve the light emission uniformity of the light guide plate 110 .

4 is a schematic cross-sectional view of a display device according to a fourth embodiment of the present invention. Please refer 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 with the display device 11 of FIG. 2 , the display device 13 of this embodiment further includes another electrically controlled diffusion layer 400 ″ and another optical auxiliary layer 350 ″. For example, the bottom surface 110bs of the light guide plate 110 can also be provided with another electronically controlled diffusion layer 400" and another optical auxiliary layer 350" at the portion overlapping the camera module 300, and the optical auxiliary layer 350" is connected to the light guide plate 110. Bottom surface 110bs and 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.

Through the provision of 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.

FIG. 5 is a schematic cross-sectional view of a display device according to a fifth embodiment of the present invention. Please refer to FIG. 5 . The difference between the display device 20 of this embodiment and the display device 10 of FIG. 1 lies in the type of backlight module. Specifically, unlike the backlight module 100 of FIG. 1 which is an edge-lit backlight module, the backlight module 100B of this embodiment may also be a direct-lit backlight module.

For example, the backlight module 100B may include a carrier 160 and a plurality of light-emitting elements 180 . The carrier board 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 board 160. Each of these light-emitting elements 180 has a light-emitting surface 180es facing the display panel 200, and these light-emitting surfaces 180es can 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-collecting surface 300rs of the camera module 300 along the normal direction of the surface 160s (eg, direction Z). In order to reduce the impact of the light-emitting elements 180 on the light collection effect of the camera module 300, the arrangement density of the light-emitting elements 180 in the area overlapping the camera module 300 may be different from the arrangement density in other areas. For example, any two adjacent light-emitting elements 180 in the area that does not overlap with the camera module 300 on the carrier board 160 have a spacing S1 along the arrangement direction, but in the area that overlaps with the camera module 300 on the carrier board 160 Two adjacent light-emitting elements 180 have a distance S2 along the arrangement direction, and the distance S2 may be greater than the distance S1.

The light-emitting elements 180 arranged with a spacing S2 also overlap 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 sheet. In particular, when the camera module 300 is turned off, the electronically controlled diffusion layer 400 operating in the scattering state can also increase the uniformity of the light output of the backlight module 100B in the area overlapping the camera module 300, and reduce the distance between the backlight module and the backlight module 300. The difference in light output uniformity of group 100B in the area overlapping the optical film 150 .

To sum up, in the display device according to an embodiment of the present invention, the camera module disposed on the side of the backlight module away from the display panel is used to receive external images from the side of the display panel. By arranging an electronically controlled diffusion layer between the camera module and the display panel, the camera module can have good image reception quality when receiving images and have better concealment when closed.

10, 11, 12, 13, 20: Display device 100, 100A, 100B: backlight module 110:Light guide plate 110bs: Bottom 110es, 180es: light-emitting surface 110is, 110is”: light incident surface 115: Optical microstructure 121, 122: Light source 150: Optical film 160: Carrier board 160s: Surface 180:Light-emitting component 200:Display panel 300:Camera module 300rs: glossy 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. 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

110es: light-emitting surface

110is: light incident surface

115: Optical microstructure

121:Light source

150: Optical film

200:Display panel

300:Camera module

300rs: glossy surface

400:Electrically controlled diffusion layer

DA: display area

Z: direction

Claims (10)

A display device including: A backlight module is provided with a light-emitting surface; A display panel is provided on one side of the light-emitting surface of the backlight module and is provided with a display area; A camera module is overlapped in the display area and is located on the side of the backlight module away from the display panel; and An electrically controlled diffusion layer is disposed between the camera module and the display panel, and overlaps a light-collecting surface of the camera module. The display device according to claim 1, wherein the backlight module includes: A light guide plate having a light incident surface and a light exit surface and a bottom surface connected to the light incident surface and facing each other; and A first light source is provided on one side of the light incident surface of the light guide plate, wherein the bottom surface of the light guide plate is provided with a plurality of optical microstructures, and the optical microstructures do not overlap with the receiving area of the camera module. Glossy. The display device of claim 2 further includes an optical auxiliary layer connecting the light exit surface of the light guide plate and the electrically controlled diffusion layer, and the optical auxiliary layer does not overlap the optical microstructures. The display device of claim 2, wherein the bottom surface of the light guide plate is provided with another optical auxiliary layer and another electrically controlled diffusion layer at a portion overlapping the camera module. The display device according to claim 2, wherein the light guide plate also has another light incident surface connecting the light exit surface and the bottom surface and opposite to the light incident surface, and the backlight module is located at the other entrance of the light guide plate. A second light source is also provided on one side of the light surface, and the camera module is disposed adjacent to the other light incident surface. The display device of claim 1, wherein the backlight module further includes at least one optical film, the at least one optical film is overlapped with the display area of the display panel and does not overlap with the camera module. Glossy surface. The display device of claim 6, wherein the at least one optical film includes an optical brightness enhancement film or a diffusion sheet. The display device according to claim 1, wherein the backlight module includes: a carrier board; and A plurality of light-emitting elements are arranged on the carrier plate, and a part of the light-emitting elements overlaps the camera module. The display device of claim 8, wherein the electrically controlled diffusion layer is located between the portion of the light-emitting elements and the display panel. The display device of claim 1, wherein the electrically controlled diffusion layer includes a polymer dispersed liquid crystal film.

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