TWI851166B - Display apparatus - Google Patents

Abstract

A display apparatus including a display panel, a first light source module and a second light source module is provided. The display panel has a display surface and a back surface away from the display surface. The first light source module is disposed on a side of one of the display surface and the back surface of the display panel, and overlaps the display surface. The second light source module is disposed on a side of the other one of the display surface and the back surface of the display panel, and overlaps the display surface.

Description

Display device

The present invention relates to a display technology, and in particular to a display device.

In order to meet the display requirements of different usage scenarios, a semi-transflective (or micro-transflective) display panel came into being. When there is sufficient outdoor sunlight, the semi-transflective (or micro-transflective) display panel can display under the sunlight without using a built-in backlight, thereby achieving the purpose of energy saving. When the indoor ambient light is insufficient, the semi-transflective (or micro-transflective) display panel needs to display under the auxiliary illumination of the backlight, which not only consumes power, but also affects the display quality.

The present invention provides a display device, the configuration and characteristic adjustment of the light source of which are relatively flexible.

The display device of the present invention comprises a display panel, a first light source module and a second light source module. The display panel has a display surface and a back surface away from the display surface. The first light source module is arranged on one side of the display surface and the back surface of the display panel and overlaps the display surface. The second light source module is arranged on one side of the other of the display surface and the back surface of the display panel and overlaps the display surface.

In one embodiment of the present invention, the first light source module of the display device includes a first light guide structure and a first light source. The first light guide structure has a first light incident surface and a first light emitting surface. The first light emitting surface is connected to the first light incident surface and is arranged opposite to one of the display surface and the back surface of the display panel. The first light source is arranged on one side of the first light incident surface of the first light guide structure.

In an embodiment of the present invention, the first light guide structure of the display device is a light guide plate. An optical adhesive layer is provided between the light guide plate and the display panel. The optical adhesive layer connects the first light emitting surface of the light guide plate and the display surface of the display panel.

In an embodiment of the present invention, the first light guide structure of the display device is a light guide plate. A gap layer is provided between the light guide plate and the display panel. The gap layer exposes the first light emitting surface of the light guide plate and the display surface of the display panel.

In one embodiment of the present invention, the first light incident surface of the first light-guiding structure of the above-mentioned display device includes a first sub-surface and a second sub-surface and a third sub-surface extending in a bent manner from opposite sides of the first sub-surface. The first light source includes a plurality of first light-emitting elements and a plurality of second light-emitting elements. At least part of the first light-emitting elements are arranged on one side of the first sub-surface of the first light-guiding structure. The plurality of second light-emitting elements are arranged on both sides of the second sub-surface and the third sub-surface of the first light-guiding structure. The plurality of first light-emitting elements are suitable for emitting light beams having a first color temperature. The plurality of second light-emitting elements are suitable for emitting light beams having a second color temperature, and the second color temperature is different from the first color temperature.

In an embodiment of the present invention, the angle between the second sub-surface and the third sub-surface of the display device and the virtual extension surface of the first sub-surface is in the range of 30 degrees to 40 degrees.

In one embodiment of the present invention, the first light guide structure of the display device further has a fourth sub-surface connected to the second sub-surface and the third sub-surface and opposite to the first sub-surface. Part of the first light emitting element is arranged on one side of the fourth sub-surface of the first light guide structure. The second sub-surface and the third sub-surface each have an angle of 90 degrees with the first sub-surface or the fourth sub-surface.

In one embodiment of the present invention, the first light source of the display device further includes a plurality of third light emitting elements disposed on both sides of the second sub-surface and the third sub-surface of the first light guide structure. These third light emitting elements are suitable for emitting light beams having a third color temperature. The third color temperature is different from the first color temperature. The second color temperature is 2700K, and the third color temperature is 5000K.

In an embodiment of the present invention, the first light source module of the display device is disposed on one side of the display surface of the display panel. The first light guide structure is a light guide bar or an optical fiber, and is disposed around the display surface of the display panel.

In an embodiment of the present invention, the first light source module of the display device is arranged on one side of the display surface of the display panel, and the second light source module is arranged on one side of the back of the display panel, and includes a circuit backplane and a plurality of light-emitting elements. These light-emitting elements are arrayed on the circuit backplane and electrically connected to the circuit backplane.

In one embodiment of the present invention, the circuit backplane of the display device is suitable for independently controlling the light emission of a plurality of light-emitting elements.

In one embodiment of the present invention, the second light source module of the display device includes a second light guide structure and a second light source. The second light guide structure has a second light incident surface and a second light emitting surface. The second light emitting surface is connected to the second light incident surface and is arranged opposite to the other of the display surface and the back surface of the display panel. The second light source is arranged on one side of the second light incident surface of the second light guide structure.

Based on the above, in a display device of an embodiment of the present invention, two light source modules are respectively provided on the display surface and the back surface of the display panel. One light source module is used to provide the illumination light required for the display panel to display, and the other light source module is used to adjust the color and color temperature of the display screen. The above combination can meet different application requirements of the display device.

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. Fig. 2 is a schematic top view of a first light source module of Fig. 1. Fig. 3 is a schematic top view of a first light source module according to another variant embodiment of the present invention. Fig. 4 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention.

Referring to FIG. 1 , the display device 10 includes a display panel DP, a first light source module LSM1, and a second light source module LSM2. The display panel DP has a display surface DS and a back surface BS facing away from the display surface DS. In the present embodiment, the first light source module LSM1 is disposed on one side of the display surface DS of the display panel DP and overlaps the display surface DS. The second light source module LSM2 is disposed on one side of the back surface BS of the display panel DP and overlaps the display surface DS. In the present embodiment, the display panel DP may be a semi-transflective display panel or a micro transflective display panel, the first light source module LSM1 may serve as a front light module of the display panel DP, and the second light source module LSM2 may serve as a back light module of the display panel DP, but is not limited thereto.

In the present embodiment, the first light source module LSM1 may be a side-entry front light module, which may include a first light guide structure 100 and a first light source LS1. The first light guide structure 100 has a first light incident surface 100is and a first light output surface 100es. The first light output surface 100es is connected to the first light incident surface 100is and is arranged opposite to the display surface DS of the display panel DP. The first light source LS1 is arranged on one side of the first light incident surface 100is of the first light guide structure 100. In the present embodiment, the first light guide structure 100 may be a light guide plate, and its material may include, for example, polymethyl methacrylate (PMMA), polycarbonate (PC), or cycloolefin copolymer (COP).

2 , in detail, the first light incident surface 100is of the first light guide structure 100 may include a first sub-surface 100ss1 and a second sub-surface 100ss2 and a third sub-surface 100ss3 extending in a bent manner from opposite sides of the first sub-surface 100ss1. In the present embodiment, an angle A1 between the second sub-surface 100ss2 and the virtual extension surface IMS of the first sub-surface 100ss1 and an angle A2 between the third sub-surface 100ss3 and the virtual extension surface IMS of the first sub-surface 100ss1 may be in a range of 30 degrees to 40 degrees.

The first light source LS1 may include a plurality of first light emitting elements LED1 and a plurality of second light emitting elements LED2. The plurality of first light emitting elements LED1 are arranged on one side of the first sub-surface 100ss1 of the first light guide structure 100. The plurality of second light emitting elements LED2 are arranged on both sides of the second sub-surface 100ss2 and the third sub-surface 100ss3 of the first light guide structure 100. It is particularly noted that the first light emitting elements LED1 are suitable for emitting light beams having a first color temperature, and the second light emitting elements LED2 are suitable for emitting light beams having a second color temperature, and the first color temperature is different from the second color temperature.

That is to say, in this embodiment, the first light source module LSM1 not only provides the display panel DP with the illumination light beam required for display when the ambient light is insufficient, but also has the function of adjusting the color temperature of the display screen. Furthermore, the first light source LS1 may also include a plurality of third light-emitting elements LED3, which are arranged on both sides of the second sub-surface 100ss2 and the third sub-surface 100ss3 of the first light-guiding structure 100. These third light-emitting elements LED3 are suitable for emitting a light beam with a third color temperature, and the third color temperature is different from the second color temperature and the first color temperature. For example, the second color temperature is, for example, 2700K, and the third color temperature is, for example, 5000K, but is not limited thereto. In this embodiment, the luminous colors of the plurality of first light emitting elements LED1 include, for example, red, green and blue, and the luminous colors of the plurality of second light emitting elements LED2 and the plurality of third light emitting elements LED3 include, for example, yellow, lake blue and magenta.

In this embodiment, the first light emitting element LED1, the second light emitting element LED2 and the third light emitting element LED3 may be light emitting diodes (such as micro light emitting diodes or sub-millimeter light emitting diodes), but not limited thereto.

It is particularly noted that the above-mentioned first light source module LSM1 is applicable to display devices with a display size less than 8 inches. Please refer to Figure 3. In order to allow display devices with a display size greater than 8 inches to also have the function of color temperature adjustment, in another variant embodiment, the first light incident surface 100is-A of the first light guiding structure 100A of the first light source module LSM1-A may also include a fourth sub-surface 100ss4. The fourth sub-surface 100ss4 connects the second sub-surface 100ss2-A and the third sub-surface 100ss3-A, and is arranged opposite to the first sub-surface 100ss1-A. It is particularly noteworthy that a plurality of first light-emitting elements LED1 are also provided on one side of the fourth sub-surface 100ss4 of the first light guiding structure 100A.

In a variant embodiment, an angle A3 between the first sub-surface 100ss1-A and the second sub-surface 100ss2-A, an angle A4 between the first sub-surface 100ss1-A and the third sub-surface 100ss3-A, an angle A5 between the second sub-surface 100ss2-A and the fourth sub-surface 100ss4, and an angle A6 between the third sub-surface 100ss3-A and the fourth sub-surface 100ss4 are all 90 degrees. That is to say, the first light incident surface 100is-A of the first light guiding structure 100A of the modified embodiment is rectangular in the normal direction of the first light emitting surface 100es-A, and a plurality of first light emitting elements LED1 for lighting are respectively arranged on opposite sides of the first light guiding structure 100A along the first direction, and a plurality of second light emitting elements LED2 and a plurality of third light emitting elements LED3 for adjusting the color temperature are respectively arranged on opposite sides of the first light guiding structure 100A along the second direction, wherein the first direction is perpendicular to the second direction.

Please refer to FIG. 1 . In this embodiment, an optical adhesive layer 150 is provided between the first light guide structure 100 and the display panel DP, and the optical adhesive layer 150 connects the first light incident surface 100is of the first light guide structure 100 and the display surface DS of the display panel DP. The optical adhesive layer 150 is, for example, made of optically clear resin (OCR), optically clear adhesive (OCA), or other suitable optical grade adhesive materials that are coated on the display surface DS on the entire surface. However, the present invention is not limited thereto. In another embodiment of Figure 4, the fixed relationship between the first light guiding structure 100 of the display device 10A and the display panel DP can also be achieved by a rubber band (tape) 150A distributed around the display surface DS, that is, a gap layer AG defined by the rubber band (tape) 150A can be provided between the first light guiding structure 100 and the display panel DP, and the gap layer AG exposes the first light emitting surface 100es of the first light guiding structure 100 and the display surface DS of the display panel DP.

Please continue to refer to Figure 1. In the present embodiment, the second light source module LSM2 may be a side-entry backlight module, which may include a second light guide structure 200 and a second light source LS2. The second light guide structure 200 has a second light incident surface 200is and a second light output surface 200es. The second light output surface 200es is connected to the second light incident surface 200is and is arranged opposite to the back surface BS of the display panel DP. The second light source LS2 is arranged on one side of the second light incident surface 200is of the second light guide structure 200. For example, in the present embodiment, the second light source module LSM2 can provide the display panel DP with the illumination light beam required for display when the ambient light is insufficient, and the light beam emitted by the second light source LS2 has only a single color temperature. That is, the second light source module LSM2 as a backlight module does not have the function of color temperature adjustment. The second light guide structure 200 may be a light guide plate, and its material includes, for example, polymethyl methacrylate (PMMA), polycarbonate (PC), or cycloolefin copolymer (COP).

The first light source module LSM1 and the second light source module LSM2 are respectively arranged on the opposite sides of the display surface DS and the back surface BS of the display panel DP, which can increase the design flexibility of the display device 10 to meet different application requirements. On the other hand, the second light source module LSM2 and the display panel DP can also be selectively provided with an optical film 250. The optical film 250 includes, for example: a diffusion film, an optical brightness enhancement film, at least one prism film, or a combination thereof.

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.

FIG5 is a side view schematic diagram of a display device according to a third embodiment of the present invention. FIG6 is a top view schematic diagram of the display device of FIG5 . Referring to FIG5 and FIG6 , the difference between the display device 10B of this embodiment and the display device 10 of FIG1 is that the structure of the first light source module is different. Specifically, in this embodiment, the first light guide structure 100B of the first light source module LSM1-B of the display device 10B can be a light guide bar or an optical fiber, and is arranged around the display surface DS of the display panel DP.

It is particularly noted that, in the present embodiment, the first light emitting surface 100es-B and the first light incident surface 100is-B of the first light guiding structure 100B can be selectively perpendicular to the display surface DS of the display panel DP, and the first light emitting surface 100es-B is substantially rectangular in the normal direction of the display surface DS. In the present embodiment, the first light source LS1-B can be a light emitting diode (e.g., a micro light emitting diode or a sub-millimeter light emitting diode) or a laser element, but is not limited thereto.

FIG7 is a schematic cross-sectional view of a display device according to the fourth embodiment of the present invention. Referring to FIG7 , the difference between the display device 10C of the present embodiment and the display device 10 of FIG1 is that the structure of the second light source module is different. Specifically, in the display device 10C of the present embodiment, the second light source module LSM2-A may be a direct-type backlight module, and may include a circuit backplane CB and a plurality of light-emitting elements "LED". These light-emitting elements "LED" are arranged in an array on the surface of the circuit backplane CB facing the display panel DP, and are electrically connected to the circuit backplane CB.

In the present embodiment, the circuit backplane CB is suitable for independently controlling the light emission of these light emitting elements "LED". Therefore, different light emitting areas can have different light emission brightness, that is, local dimming. Accordingly, the display contrast of the display device 10C can be effectively improved. However, the present invention is not limited to this. In a variant embodiment not shown, the plurality of light emitting elements of the second light source module can be arranged at intervals on the circuit backplane in the form of a plurality of light strips, and the circuit backplane is suitable for independently controlling the light emission of these light strips, so that linear dimming can be achieved. It is particularly noted that this linear dimming function is also applicable to side-entry light source modules (such as the second light source module LSM2 in FIG. 5 ).

On the other hand, in this embodiment, the optical film 250 shown in FIG. 1 is not disposed between the display panel DP and the second light source module LSM2-A.

Fig. 8 is a schematic cross-sectional view of a display device according to the fifth embodiment of the present invention. Fig. 9 is a schematic top view of the first light source module of Fig. 8. Referring to Fig. 8 and Fig. 9, the difference between the display device 20 of this embodiment and the display device 10 of Fig. 1 is that the configuration relationship between the two light source modules and the display panel and the composition structure of the first light source module are different.

In the display device 20 of the present embodiment, the first light source module LSM1-C can be used as a backlight module of the display panel DP, and the second light source module LSM2 can be used as a frontlight module of the display panel DP, but is not limited thereto. It is particularly noted that in the present embodiment, the first light guide structure 100C of the first light source module LSM1-C can have a light incident surface 100is1 and a light incident surface 100is2 opposite to each other, and the first light source LS1-C is disposed on both sides of the two light incident surfaces of the first light guide structure 100C.

In detail, in this embodiment, the configuration of the light incident surface 100is1 of the first light guide structure 100C and the first light source LS1-C on one side of the light incident surface 100is1 of the first light guide structure 100C are similar to the configuration of the first light incident surface 100is of the first light guide structure 100 of the first light source module LSM1 in FIG2 and the first light source LS1 on one side of the light incident surface 100is of the first light guide structure 100. Therefore, please refer to the relevant paragraphs of the aforementioned embodiment for detailed description, which will not be repeated here.

Different from the first light source module LSM1 in Figure 2, the other light incident surface 100is2 of the first light guiding structure 100C of the present embodiment may also include a first sub-surface 100ss1", a second sub-surface 100ss2" and a third sub-surface 100ss3", and the configuration relationship between these sub-surfaces of the light incident surface 100is2 can be selectively the same as the configuration relationship between the first sub-surface 100ss1, the second sub-surface 100ss2 and the third sub-surface 100ss3 of the light incident surface 100is1, which will not be repeated here.

It is particularly noted that in the present embodiment, the first light-guiding structure 100C is also provided with a plurality of second light-emitting elements LED2 and a plurality of third light-emitting elements LED3 on both sides of the second sub-surface 100ss2" and the third sub-surface 100ss3" of the light incident surface 100is2, for adjusting the color temperature of the display screen. More specifically, unlike the display device 10 of FIG. 1 , in the present embodiment, the first light source module LSM1-C having both the functions of lighting and adjusting the color temperature of the display screen can also be used as a backlight module of the display panel DP.

In summary, in a display device of an embodiment of the present invention, two light source modules are respectively provided on the display surface and the back surface of the display panel. One light source module is used to provide the illumination light required for the display panel to display, and the other light source module is used to adjust the color and color temperature of the display screen. The above combination can meet different application requirements of the display device.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technical personnel in this field should understand that they can still modify the technical solutions described in the above embodiments, or replace part or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

10, 10A, 10B, 10C, 20: display device 100, 100A, 100B, 100C: first light guide structure 100es, 100es-A, 100es-B, 200es: light emitting surface 100is, 100is-A, 100is-B, 200is, 100is1, 100is2: light incident surface 100ss1, 100ss2, 100ss3, 100ss1-A, 100ss2-A, 100ss3-A, 100ss4, 100ss1”, 100ss2”, 100ss3”: sub-surface 150: optical adhesive layer 150A: word glue 200: second light guide structure 250: optical film A1, A2, A3, A4, A5, A6: angle AG: gap layer BS: back CB: circuit backplane DS: display surface DP: display panel IMS: virtual extension surface LED1, LED2, LED3, LED": light-emitting element LS1, LS1-A, LS1-B, LS1-C: first light source LS2: second light source LSM1, LSM1-A, LSM1-B, LSM1-C: first light source module LSM2, LSM2-A: second light source module

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 top view of a first light source module of FIG. 1. FIG. 3 is a schematic top view of a first light source module of another variant embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. FIG. 5 is a schematic side view of a display device according to a third embodiment of the present invention. FIG. 6 is a schematic top view of a display device of FIG. 5. FIG. 7 is a schematic cross-sectional view of a display device according to a fourth embodiment of the present invention. FIG. 8 is a schematic cross-sectional view of a display device according to a fifth embodiment of the present invention. FIG. 9 is a schematic top view of a first light source module of FIG. 8.

10: Display device

100: first light guide structure

100es, 200es: bright surface

100is, 200is: light incident surface

150: Optical glue layer

200: Second light guide structure

250: Optical film

BS: Back

DS: Display Surface

DP: Display Panel

LS1: First Light Source

LS2: Second light source

LSM1: First light source module

LSM2: Second light source module

Claims (10)

A display device comprises: a display panel having a display surface and a back surface facing away from the display surface; a first light source module arranged on one side of the display surface and the back surface of the display panel and overlapping the display surface, the first light source module comprising: a first light guide structure having a first light incident surface and a first light emitting surface, the first light emitting surface being connected to the first light incident surface and arranged opposite to the display surface and the back surface of the display panel; and a first light source arranged on one side of the first light incident surface of the first light guide structure; and a second light source module arranged on one side of the other of the display surface and the back surface of the display panel and overlapping the display surface. The first light-incident surface of the first light-guiding structure includes a first sub-surface and a second sub-surface and a third sub-surface extending in a bent manner from opposite sides of the first sub-surface. The first light source includes a plurality of first light-emitting elements and a plurality of second light-emitting elements. At least part of the first light-emitting elements are arranged on one side of the first sub-surface of the first light-guiding structure. The second light-emitting elements are arranged on both sides of the second sub-surface and the third sub-surface of the first light-guiding structure. The first light-emitting elements are suitable for emitting light beams with a first color temperature, and the second light-emitting elements are suitable for emitting light beams with a second color temperature, and the second color temperature is different from the first color temperature. The display device as described in claim 1, wherein the first light guide structure is a light guide plate, an optical adhesive layer is provided between the light guide plate and the display panel, and the optical adhesive layer connects the first light emitting surface of the light guide plate and the display surface of the display panel. The display device as described in claim 1, wherein the first light guide structure is a light guide plate, a gap layer is provided between the light guide plate and the display panel, and the gap layer exposes the first light emitting surface of the light guide plate and the display surface of the display panel. A display device as described in claim 1, wherein the angle between the second sub-surface and the third sub-surface and the virtual extension surface of the first sub-surface is in the range of 30 degrees to 40 degrees. The display device as claimed in claim 1, wherein the first light guide structure further has a fourth sub-surface connected to the second sub-surface and the third sub-surface and opposite to the first sub-surface, and part of the first light-emitting elements are arranged on one side of the fourth sub-surface of the first light guide structure, wherein the second sub-surface and the third sub-surface each form an angle of 90 degrees with the first sub-surface or the fourth sub-surface. The display device as claimed in claim 1, wherein the first light source further comprises a plurality of third light-emitting elements disposed on both sides of the second sub-surface and the third sub-surface of the first light-guiding structure, wherein the third light-emitting elements are adapted to emit a light beam having a third color temperature, the third color temperature being different from the first color temperature, wherein the second color temperature is 2700K, and the third color temperature is 5000K. A display device includes: a display panel having a display surface and a back surface away from the display surface; a first light source module, arranged on one side of the display surface and the back surface of the display panel and overlapping the display surface, the first light source module including: a first light guide structure having a first light incident surface and a first light emitting surface, the first light emitting surface connected to the first light incident surface and connected to the display surface and the back surface of the display panel One of the display panels is disposed opposite to the other; and the first light source is disposed on one side of the first light incident surface of the first light guide structure; and the second light source module is disposed on one side of the other of the display surface and the back surface of the display panel and overlaps the display surface, wherein the first light source module is disposed on one side of the display surface of the display panel, and the first light guide structure is a light guide bar or an optical fiber, and is disposed around the display surface of the display panel. The display device as described in claim 1, wherein the first light source module is disposed on one side of the display surface of the display panel, and the second light source module is disposed on one side of the back side of the display panel, and comprises: a circuit backplane; and a plurality of light-emitting elements arranged in an array on the circuit backplane and electrically connected to the circuit backplane. A display device as described in claim 8, wherein the circuit backplane is suitable for independently controlling the light-emitting elements to emit light. The display device as claimed in claim 1, wherein the second light source module comprises: a second light guide structure having a second light incident surface and a second light emitting surface, the second light emitting surface being connected to the second light incident surface and disposed opposite to the other of the display surface and the back surface of the display panel; and a second light source disposed on one side of the second light incident surface of the second light guide structure.

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