CN114647111A

CN114647111A - Display device

Info

Publication number: CN114647111A
Application number: CN202011502328.5A
Authority: CN
Inventors: 焦佑麒; 黄永立; 刘家麟; 邓嘉峰; 刘金涌
Original assignee: Hannstar Display Nanjing Corp; Hannstar Display Corp
Current assignee: Hannstar Display Nanjing Corp; Hannstar Display Corp
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2022-06-21

Abstract

The invention discloses a display device, which is provided with a display area and comprises a backlight module and a display layer. The backlight module comprises a substrate, a plurality of first light-emitting pieces, a plurality of second light-emitting pieces, a light guide structure and a backlight control assembly. The first light-emitting elements and the second light-emitting elements are arranged on the upper surface of the substrate and in the display area, wherein each first light-emitting element is provided with a first light-emitting surface, each first light-emitting surface is parallel to the upper surface of the substrate, each second light-emitting element is provided with a second light-emitting surface, and each second light-emitting surface is vertical to the upper surface of the substrate. The light guide structure is arranged on the upper surface of the substrate, and light emitted by the second light emitting element is emitted into the light guide structure. The backlight control assembly is electrically connected with the first light-emitting piece and the second light-emitting piece and is used for respectively controlling the on-off states of the first light-emitting piece and the second light-emitting piece. The display layer is arranged on the backlight module, and the display layer comprises a plurality of display units in the display area.

Description

Display device

Technical Field

The present invention relates to a display device, and more particularly, to a display device having a backlight module with a local dimming (local dimming) function.

Background

Nowadays, display devices are widely used in various electronic products such as notebook computers (notebook computers), smart phones (smart phones), wearable devices, smart watches, and display screens for vehicles to provide more convenient information transmission and display.

In the display device, a backlight module with a local dimming function can be used to improve the contrast of a display picture and save electric energy. However, when the conventional direct type backlight module has a local dimming function, the backlight module does not need to use a large number of light emitting members for zone control, and is also not ideal for backlight control of an area having a special shape (e.g., luminance unevenness). Accordingly, it is necessary to improve these problems.

Disclosure of Invention

The invention provides a display device, wherein a backlight module comprises light emitting elements with different light emitting directions so as to reduce the total amount of the light emitting elements and/or improve the backlight control effect on a special-shaped area.

In order to solve the above technical problem, the present invention provides a display device having a display area, and including a backlight module and a display layer. The backlight module comprises a substrate, a plurality of first light-emitting pieces, a plurality of second light-emitting pieces, a light guide structure and a backlight control assembly. The substrate has an upper surface. The first light-emitting components are arranged on the upper surface of the substrate and in the display area, wherein each first light-emitting component is provided with a first light-emitting surface, and each first light-emitting surface is parallel to the upper surface of the substrate. The second light-emitting members are disposed on the upper surface of the substrate and in the display area, wherein each second light-emitting member has a second light-emitting surface, and each second light-emitting surface is perpendicular to the upper surface of the substrate. The light guide structure is arranged on the upper surface of the substrate, and light emitted by the second light emitting element is emitted into the light guide structure. The backlight control assembly is electrically connected with the first light-emitting piece and the second light-emitting piece and is used for respectively controlling the on-off states of the first light-emitting piece and the second light-emitting piece. The display layer is arranged on the backlight module, and the display layer comprises a plurality of display units in the display area.

In the present invention, since the first and second light emitting elements are disposed in the backlight module, the number of light emitting elements in the backlight module can be reduced and the backlight can be uniformized under the condition of the backlight module having the function of local dimming. In addition, the backlight module can be provided with an empty area without any light emitting element, and the empty area of the second light emitting element is used for providing light to be used as backlight of the empty area, wherein the shape of the empty area can be a conventional shape or an irregular shape. According to the configuration of the light emitting member of the present invention, the partition of the display area can be designed into a regular shape or an irregular shape according to the requirement, so that the dimming limitation of the function of local dimming is reduced.

Drawings

Fig. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the invention.

Fig. 2 is a schematic top view of a backlight module of a display device according to a first embodiment of the invention.

Fig. 3 is a schematic top view illustrating a first light emitting assembly according to a first embodiment of the invention.

Fig. 4 is a schematic top view illustrating a second light emitting group according to a first embodiment of the invention.

Fig. 5 is a schematic cross-sectional view illustrating a substrate, a second light emitting element and a light guide structure of a display device according to an embodiment of the invention.

Fig. 6 is a schematic cross-sectional view illustrating a substrate, a second light emitting element and a light guide structure of a display device according to another embodiment of the invention.

Fig. 7 is a schematic top view illustrating a first light emitting group and a vacant area of a backlight module of a display device according to a second embodiment of the invention.

Fig. 8 is a schematic top view illustrating a backlight module of a display device according to a third embodiment of the invention.

Fig. 9 is a schematic top view illustrating a backlight module of a display device according to a fourth embodiment of the invention.

Fig. 10 is a schematic top view of a conventional backlight module.

Fig. 11 is a schematic cross-sectional view of a display device according to a fifth embodiment of the invention.

Fig. 12 is a schematic cross-sectional view of a display device according to a sixth embodiment of the invention.

Fig. 13 is a schematic cross-sectional view of a display device according to a seventh embodiment of the invention.

Fig. 14 is a schematic cross-sectional view illustrating a substrate, a second light emitting element and a light guide structure of a display device according to a seventh embodiment of the invention.

Description of reference numerals: 100. 200, 300, 400, 500, 600, 700-display device; 110-a substrate; 110 s-upper surface; 120-a first light emitting element; 120 a-a first light-emitting surface; 130-a second light emitting member; 130 a-a second light-emitting surface; 140-a light guiding structure; 140 h-punching; 140 n-grooves; 142-a plate body; 144-diffusion dots; 146-a light attenuating member; 150-a backlight control assembly; 180-a display layer; 180 u-a display unit; BL-backlight module; BL' -traditional backlight module; da-alignment direction; dn-normal direction; dp-vertical; a DR-display area; ld-light emission direction; LE 1-first light emitting group; LE 2-second light emitting group; LH-halo range; r1-first region; r2-second region; RI-luminous ring; RI1 — minimum light emitting ring; RI 2-maximum luminous ring; an RR-loop region; s1, S2-shortest distance; VR, VR _1, VR _ 2-empty region.

Detailed Description

In order to make the present invention more comprehensible to those skilled in the art, preferred embodiments of the present invention are specifically described below, and the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the drawings are simplified schematic drawings, and accordingly, only the components and combinations related to the present invention are shown to provide a clearer description of the basic architecture or implementation method of the present invention, while the actual components and layout may be more complicated. In addition, for convenience of description, the components shown in the drawings are not necessarily drawn to scale, and the actual implementation numbers, shapes and sizes may be adjusted according to design requirements.

It is to be understood that the following illustrative embodiments may be implemented by replacing, recombining, and mixing features of several different embodiments without departing from the spirit of the present invention. Features of the various embodiments may be combined and matched as desired, without departing from the spirit or ambit of the invention.

The display device of the present invention may be a non-self-luminous display device, such as a Liquid Crystal Display (LCD), an electrophoretic display (electrophoretic display), or other suitable display devices, and may also be a display device with a touch function (touch display device), and the following embodiments take the liquid crystal display device as an example for description. In addition, the display device may be rectangular, polygonal, circular, irregular, include at least one curved edge (e.g., a straight line on two sides and a circular arc on two sides), or other suitable shapes.

Referring to fig. 1 to 4, fig. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the invention, fig. 2 is a schematic top view of a backlight module of the display device according to the first embodiment of the invention, fig. 3 is a schematic top view of a first light-emitting group according to the first embodiment of the invention, and fig. 4 is a schematic top view of a second light-emitting group according to the first embodiment of the invention. As shown in fig. 1 and 2, the display device 100 may have a display region DR and a peripheral region located at least one side of the display region DR, wherein the display region DR is used for displaying a frame, and the peripheral region does not display the frame. It should be noted that, for the sake of clarity, the drawings only show the display region DR and do not show the peripheral region, that is, fig. 2 only shows the structure of the backlight module in the display region DR. In addition, the display region DR may have a rectangular shape, a polygonal shape, a circular shape, an irregular shape, a shape including at least one curved edge (e.g., a shape in which two sides are straight lines and two sides are circular arcs), or other suitable shapes. For example, in fig. 2, the shape of the display region DR may be a circle, but is not limited thereto.

As shown in fig. 1 and fig. 2, the display device 100 of the present embodiment includes a backlight module BL and a display layer 180, the display layer 180 is disposed on the backlight module BL, wherein the backlight module BL is used for providing light rays to the display layer 180, and the display layer 180 achieves the effect of displaying brightness by changing the light transmittance (i.e., the ratio of the backlight penetrating through the display layer 180) of each sub-pixel in the display region DR.

As shown in fig. 1 and fig. 2, the backlight module BL may include a substrate 110, a plurality of first light emitting elements 120, a plurality of second light emitting elements 130, a light guide structure 140, and a backlight control assembly 150, wherein the substrate 110 has an upper surface 110s, and the first light emitting elements 120, the second light emitting elements 130, and the light guide structure 140 are disposed on the upper surface 110s of the substrate 110. The substrate 110 of the present embodiment may include any suitable material, for example, the substrate 110 may be a rigid substrate or a flexible substrate, and may correspondingly include, but is not limited to, glass, plastic, quartz, sapphire, Polyimide (PI), and/or polyethylene terephthalate (PET) according to the type of the substrate 110.

The first light-emitting elements 120 and the second light-emitting elements 130 are disposed in the display region DR, wherein each of the first light-emitting elements 120 has a first light-emitting surface 120a, each of the second light-emitting elements 130 has a second light-emitting surface 130a, and the first light-emitting surface 120a is not parallel to the second light-emitting surface 130 a. It should be noted that, in the drawings, the first light emitting surface 120a and the second light emitting surface 130a are represented by thick lines, and if a region is surrounded by thick lines in the drawings, the light emitting surfaces are surfaces of the region surrounded by the thick lines. In fig. 1 and fig. 2, the first light emitting surface 120a of the first light emitting element 120 is parallel to the upper surface 110s of the substrate 110, that is, the first light emitting surface 120a of the first light emitting element 120 is perpendicular to the normal direction Dn of the upper surface 110s of the substrate 110. In this embodiment, the first light emitting surface 120a of the first light emitting element 120 can be an upper surface of the first light emitting element 120. In fig. 1 and fig. 2, the second light-emitting surface 130a of the second light-emitting element 130 is perpendicular to the upper surface 110s of the substrate 110, that is, the second light-emitting surface 130a of the second light-emitting element 130 can be a side surface of the second light-emitting element 130. It should be noted that, in the present invention, the phrase "the second light emitting surface 130a is perpendicular to the upper surface 110s of the substrate 110" means that an included angle between the second light emitting surface 130a and the upper surface 110s of the substrate 110 is between 80 and 100 degrees, between 85 and 95 degrees, between 89 and 91 degrees, or 90 degrees.

The second light-emitting surface 130a of the second light-emitting member 130 can adjust a direction faced by the second light-emitting surface 130a according to a disposition position of the second light-emitting member 130 and/or an actual use requirement. For example, in fig. 2, if the second light emitting element 130 is adjacent to the first light emitting element 120, the second light emitting surface 130a may face away from the first light emitting element 120, but not limited thereto. For example, in fig. 2, at least a portion of the second light emitting surface 130a of the second light emitting element 130 may face the center of the display region DR, but not limited thereto. Accordingly, the facing directions of the second light emitting surfaces 130a of the different second light emitting elements 130 may be the same or different.

The first light emitting element 120 and the second light emitting element 130 may be arranged according to actual requirements. In some embodiments, as shown in fig. 2 and 3, the backlight module BL may include at least one first light emitting group LE1, each first light emitting group LE1 includes one of the first light emitting devices 120 and one of the second light emitting devices 130, the first light emitting device 120 and the second light emitting device 130 in each first light emitting group LE1 are disposed adjacent to each other, and the second light emitting surface 130a faces away from the first light emitting device 120. In the first light emitting group LE1, the first light emitting element 120 and the second light emitting element 130 may have a suitable distance therebetween. For example, as shown in fig. 3, the shortest distance S1 between the edge of the first light emitting element 120 and the center of the second light emitting element 130 may be 1 to 10 millimeters (mm) or 1 to 5 mm, but not limited thereto. In addition, in some embodiments, one of the edges of the first light emitting member 120 may be parallel to one of the edges of the second light emitting member 130, but not limited thereto.

In some embodiments, as shown in fig. 2 and 4, the backlight module BL further includes at least one second light-emitting group LE2, each second light-emitting group LE2 includes one of the first light-emitting devices 120 and two of the second light-emitting devices 130, in each second light-emitting group LE2, the first light-emitting device 120 and the two second light-emitting devices 130 are disposed adjacent to each other, the first light-emitting device 120 is disposed between the two second light-emitting devices 130, and both of the two second light-emitting surfaces 130a face away from the first light-emitting device 120. In the second light emitting group LE2, the first light emitting elements 120 and the second light emitting elements 130 may be arranged in any manner, and the first light emitting elements 120 and the second light emitting elements 130 may have a suitable distance therebetween. For example, as shown in fig. 4, the shortest distance S2 between the edge of the first light emitting element 120 and the center of the second light emitting element 130 may be 1 to 10 mm or 1 to 5 mm, but not limited thereto.

In addition, in the second light emitting group LE2 of fig. 4, the first light emitting elements 120 and the two second light emitting elements 130 may be arranged along an arrangement direction Da, for example. For example, in fig. 4, an angle between an edge of the second light emitting element 130 of the second light emitting group LE2 and a vertical direction Dp perpendicular to the arrangement direction Da may be-30 degrees to 30 degrees, wherein the arrangement direction Da and the vertical direction Dp are perpendicular to the normal direction Dn of the upper surface 110s of the substrate 110, but not limited thereto. It should be noted that, the included angles between the edges of the two second light emitting elements 130 of the second light emitting group LE2 and the vertical direction Dp may be the same or different. It should be noted that, since the included angle between the edge of the second light emitting element 130 of the second light emitting group LE2 and the vertical direction Dp is-30 degrees to 30 degrees, the second light emitting element 130 can be illuminated to a desired position (for example, a position far away from the light emitting element) by adjusting the included angle, so as to minimize the area not illuminated by the light emitting element.

In fig. 3 and 4, a circle drawn by a dotted line may be an example of a halo range LH where the first light emitting element 120 emits light upwards, and an arrow drawn by a dotted line may be an example of a light emitting direction Ld of the second light emitting element 130. Therefore, the halo range LH of the first light emitting element 120 emitting light upwards covers the position of the second light emitting element 130, and the second light emitting element 130 can emit light towards a specific lateral direction according to the requirement. It should be noted that the halo range LH of the first light-emitting element 120 emitting light upwards can be adjusted according to the requirement, for example, the size of the halo range LH can be adjusted by adjusting an Optical Distance (OD) of the first light-emitting element 120, wherein the optical Distance can be, for example, a Distance (parallel to the normal direction Dn of the upper surface 110s of the substrate 110) between the first light-emitting surface 120a of the first light-emitting element 120 and a structure (e.g., a light diffusion structure) for diffusing light on the first light-emitting element 120 in the vertical direction, but is not limited thereto. In the first and second light emitting groups LE1 and LE2, the shortest distances S1 and S2 between the edge of the first light emitting element 120 and the center of the second light emitting element 130 may increase as the optical distance value of the first light emitting element 120 increases. For example, the shortest distances S1 and S2 between the edge of the first light emitting element 120 and the center of the second light emitting element 130 may be the same as the optical distance value of the first light emitting element 120, but not limited thereto. For example, the optical distance of the first light emitting element 120 may be less than 10 mm, or may be 1 to 3 mm, so that the halo range LH of the first light emitting element 120 emitting light upwards has a suitable size and may cover the position of the second light emitting element 130, but not limited thereto. It should be noted that the light diffusion structure (diffuser) can be a structure in the light guide structure 140 or a structure independent from the light guide structure 140.

The backlight module BL of the display device 100 may be divided into a plurality of sub-regions according to the requirement to perform the partitioned backlight control on the display region DR, thereby achieving the local dimming (local dimming) function. In the present invention, the sub-regions partitioned by the backlight module BL may be arranged in a one-dimensional (1D) manner or in a two-dimensional (2D) manner according to the requirement, wherein the one-dimensional (1D) manner may be arranged linearly or from inside to outside, and the two-dimensional (2D) manner may be arranged in a matrix, but not limited thereto. In the embodiment, as shown in fig. 2, the sub-regions of the backlight module BL can be arranged from inside to outside, but not limited thereto. The arrangement of the light emitting members (the first light emitting member 120 and the second light emitting member 130) of the backlight module BL shown in fig. 2 and the relationship between the light emitting members and the sub-regions will be described in detail below.

As shown in fig. 2, the sub-region of the backlight module BL may include a plurality of annular regions RR arranged from inside to outside, and the backlight module BL may include a plurality of light emitting rings RI defined by the light emitting devices (the first light emitting device 120 and the second light emitting device 130) arranged, and the light emitting rings RI are respectively located in one annular region RR. In the present embodiment, each of the light emitting rings RI is formed by arranging a portion of the first light emitting devices 120 (i.e., some of the first light emitting devices 120), or by arranging a portion of the first light emitting devices 120 (i.e., some of the first light emitting devices 120) and a portion of the second light emitting devices 130 (i.e., some of the second light emitting devices 130), but not limited thereto. In addition, the sub-region may optionally include an empty region VR, and neither the first light-emitting member 120 nor the second light-emitting member 130 is disposed in the empty region VR. In the present embodiment, the empty region VR is located at the center of the display region DR and is surrounded by the annular region RR, but not limited thereto. It should be noted that the shape of the empty region VR may be rectangular, polygonal, circular, irregular, a shape including at least one curved edge (for example, a shape with two straight sides and two circular arcs), or other suitable shapes, and the ring shape of the ring-shaped region RR may correspond to the shape of the empty region VR. For example, the shape of the empty region VR is circular, and the ring shape of the annular region RR is circular, but not limited thereto.

With respect to the light emitting rings RI defined by the arrangement of the light emitting members, the number of the light emitting members included in each light emitting ring RI may be the same or different, and the light emitting members may be arranged in any suitable manner to form the light emitting rings RI. In some embodiments, as shown in fig. 2, the minimum light-emitting ring RI1 (the minimum light-emitting ring RI1 is located in the minimum annular region RR) of the light-emitting rings RI is formed by arranging the first light-emitting element 120 and the second light-emitting element 130. In detail, the backlight module BL may include a plurality of first light emitting groups LE1, and the first light emitting groups LE1 may be arranged as a minimum light emitting ring RI1 of the light emitting rings RI. In the present embodiment, the first light emitting element 120 and the second light emitting element 130 of the first light emitting group LE1 are arranged from outside to inside, such that the second light emitting surface 130a of the second light emitting element 130 faces the empty region VR of the sub-region of the backlight module BL. Accordingly, although the first light emitting element 120 and the second light emitting element 130 are not disposed in the empty region VR, since the second light emitting surface 130a of the second light emitting element 130 faces the empty region VR, the empty region VR can provide light from the second light emitting element 130 located outside the empty region VR. In addition, since the minimum luminous ring RI1 is formed by arranging the first luminous groups LE1, and the minimum luminous ring RI1 is located in the smallest annular region RR surrounding the empty region VR, the first luminous group LE1 may surround the empty region VR, but not limited thereto.

In some embodiments, as shown in fig. 2, the light-emitting rings RI located between the maximum light-emitting ring RI2 (the maximum light-emitting ring RI2 is located in the maximum ring region RR) and the minimum light-emitting ring RI1 (the minimum light-emitting ring RI1 is located in the minimum ring region RR) may be formed by arranging the first light-emitting devices 120, but not limited thereto.

In some embodiments, as shown in fig. 2, the largest light-emitting ring RI2 (the largest light-emitting ring RI2 is located in the largest annular region RR) of the light-emitting rings RI is formed by arranging the first light-emitting element 120 and the second light-emitting element 130. In detail, the backlight module BL may include a plurality of second light-emitting groups LE2, and the second light-emitting groups LE2 may be arranged as a largest light-emitting ring RI2 of the light-emitting rings RI. In this embodiment, since the backlight module BL is divided into sub-regions arranged from inside to outside in the display region DR, and the second light-emitting group LE2 can be arranged as the maximum light-emitting ring RI2 located in the maximum annular region RR of the sub-regions, the second light-emitting group LE2 can be adjacent to the edge of the display region DR, but not limited thereto. In the present embodiment, as shown in fig. 2, the arrangement direction Da of the first light-emitting element 120 and the second light-emitting element 130 of the second light-emitting group LE2 is substantially parallel to a tangent line of the maximum light-emitting ring RI2 passing through the first light-emitting element 120, but not limited thereto. Since the annular region RR in which the maximum light-emitting ring RI2 is located has a larger area, the second light-emitting member 130 in the second light-emitting group LE2 can illuminate the position, far away from the second light-emitting group LE2, in the maximum light-emitting ring RI2, so as to minimize the area not illuminated by the light-emitting member.

In addition, in fig. 2, the number of the first light-emitting elements 120 included in each light-emitting ring RI may be the same, but is not limited thereto. In some embodiments, one first light emitting member 120 of one light emitting ring RI may be aligned in a direction with one first light emitting member 120 of another adjacent light emitting ring RI. For example, in fig. 2, each first light-emitting element 120 of one light-emitting ring RI may be aligned with one first light-emitting element 120 of another adjacent light-emitting ring RI in a direction toward the center of the display region DR, but not limited thereto.

Since the first light emitting device 120 and the second light emitting device 130 of the backlight module BL are annularly arranged, and the empty region VR can provide light by the second light emitting device 130 located outside the empty region VR, the backlight module BL can control the backlight of each of the annular regions RR and the empty region VR by controlling the light emission of the first light emitting device 120 and the second light emitting device 130 (for example, the on-off states of the first light emitting device 120 and the second light emitting device 130), so as to achieve the function of local dimming. For example, in fig. 2, the backlight of the largest ring-shaped region RR is provided by the first light-emitting element 120 and the second light-emitting element 130 of the second light-emitting group LE2 of the largest light-emitting ring RI2, the backlight of the smallest ring-shaped region RR is provided by the first light-emitting element 120 of the first light-emitting group LE1 of the smallest light-emitting ring RI1, the backlight of the empty region VR is provided by the second light-emitting element 130 of the first light-emitting group LE1 of the smallest light-emitting ring RI1, and the other ring-shaped regions RR are provided by the first light-emitting element 120 located therein, but not limited thereto.

In some embodiments, the light emitting element may also be used to enhance the brightness of the backlight of another annular region RR adjacent to the annular region RR where the light emitting element is located, but not limited thereto.

When the light emitted from the light emitting element of the backlight module BL is incident into the light guiding structure 140, the light guiding structure 140 can be used to adjust the light path of the light, so that the backlight generated by the sub-regions (e.g., the annular region RR, the empty region VR) of the backlight module BL is uniform, and the backlight brightness generated by different sub-regions is substantially the same. In some embodiments, after the light emitted from the light emitting element of the backlight module BL enters the light guide structure 140, the light path of the light is adjusted by the light guide structure 140 and exits the light guide structure 140 substantially along the normal direction Dn of the upper surface 110s of the substrate 110.

In the embodiment, as shown in fig. 1, the light guide structure 140 may be a plate-shaped structure, but is not limited thereto. In the present embodiment, as shown in fig. 1, the light guide structure 140 may include a plurality of through holes 140h, and the first light emitting element 120 and the second light emitting element 130 are located in the through holes 140h, but not limited thereto. In fig. 1, since the second light-emitting surface 130a of the second light-emitting element 130 is perpendicular to the upper surface 110s of the substrate 110 and the second light-emitting surface 130a faces the sidewall of the through hole 140h of the light-guiding structure 140, most or all of the light emitted by the second light-emitting element 130 is incident into the light-guiding structure 140. In addition, in fig. 1, since the first light emitting element 120 is located in the through hole 140h, the first light emitting surface 120a is not overlapped with the light guiding structure 140, so that only a small amount of light (for example, light having a large included angle with the normal direction of the first light emitting surface 120 a) may be incident into the light guiding structure 140 in the light emitted by the first light emitting element 120, or the light emitted by the first light emitting element 120 may not be incident into the light guiding structure 140. That is, in the embodiment of fig. 1, the light guide structure 140 adjusts the optical path of most or all of the light emitted by the second light emitting element 130, and the light guide structure 140 may not adjust the optical path of the light emitted by the first light emitting element 120 or adjust the optical path of only a small amount of light, but not limited thereto.

In addition, in fig. 1, the thickness of the light guide structure 140 may be greater than that of the second light emitting element 130, for example, so that most or all of the light emitted by the second light emitting element 130 can be emitted into the light guide structure 140, but not limited thereto. Alternatively, in fig. 1, the thickness of the light guide structure 140 may be greater than that of the first light emitting element 120, but not limited thereto.

The backlight module BL can adjust the optical path of the light entering the light guide structure 140 in any suitable manner. For example, in the light guide structure 140 shown in fig. 5 and 6, the light guide structure 140 may include a plate body 142, and optionally a plurality of diffusing dots 144, and the diffusing dots 144 may be disposed on a side of the plate body 142 adjacent to the substrate 110 and/or a side away from the substrate 110. In fig. 5, the diffusing dots 144 of the light guiding structure 140 are disposed on a side of the plate body 142 adjacent to the substrate 110; in fig. 6, the diffusing dots 144 of the light guiding structure 140 are disposed on a side of the plate body 142 adjacent to the substrate 110 and a side of the plate body away from the substrate 110. In addition, the density and arrangement of the diffusing dots 144 can be designed according to actual requirements. In some embodiments, the density of the diffused dots 144 adjacent to the side of the substrate 110 may be the same or different from the density of the diffused dots 144 away from the side of the substrate 110. For example, in fig. 6, the density of the diffusion dots 144 adjacent to the side of the substrate 110 may be greater than the density of the diffusion dots 144 away from the side of the substrate 110, but not limited thereto. In some embodiments (not shown), the density of the diffusion dots 144 may be increased with the distance from the light emitting element (e.g., the second light emitting element 130), so that the brightness of the backlight generated by the backlight module BL is more uniform, but not limited thereto.

The light guide structure 140 may be a rigid structure or a flexible structure, and may include a suitable material with high light transmittance according to the type of the light guide structure 140. For example, the light guide structure 140 (e.g., the plate body 142) may include Polycarbonate (PC), polymethyl methacrylate (PMMA), transparent optical adhesive (OCA), silicon gel, or a combination thereof, but is not limited thereto. The diffusive mesh points 144 may be formed on the plate body 142 in any suitable manner. In some embodiments, the diffusing dots 144 may be formed on the plate 142 by a printing process, but not limited thereto. For example, the inks used to form the diffusive dots 144 may be white ink and black ink, and the ratio between the white ink and the black ink may be 100: 1 to 100: 10, but not limited thereto. In some embodiments, the diffusing dots 144 may be formed on the plate 142 by, for example, but not limited to, gluing. Additionally, the top-view shape of the diffusing dots 144 may be any suitable shape. For example, the top view shape of the diffusing dots 144 may be circular, but not limited thereto.

Referring to fig. 1 and fig. 2, optionally, the display device 100 may further include a reflective structure (not shown), for example, disposed in the substrate 110 or disposed between the substrate 110 and the second light emitting surface 130a of the second light emitting element 130, so that a part of the light emitted by the second light emitting element 130 can be reflected to the display layer 180 through the reflective structure, but not limited thereto.

The backlight control assembly 150 may be disposed at any suitable position in the backlight module BL (for example, the backlight control assembly 150 is disposed on the upper surface 110s of the substrate 110, but not limited thereto), and electrically connects the first light emitting element 120 and the second light emitting element 130 to control the on/off states of the first light emitting element 120 and the second light emitting element 130, respectively, so as to control the backlight of the sub-region (e.g., the ring region RR, the empty region VR) of the backlight module BL, thereby achieving the function of local dimming. For example, when the backlight of the largest ring-shaped region RR is to be turned off, the light emitting elements in the largest light emitting ring RI2 in the largest ring-shaped region RR may be turned off (i.e., the first light emitting element 120 and the second light emitting element 130 in the second light emitting group LE2 are turned off); when the backlight of the smallest ring-shaped region RR is to be turned off, the first light-emitting element 120 in the smallest luminous ring RI1 within the smallest ring-shaped region RR may be turned off (i.e., the first light-emitting element 120 in the first light-emitting group LE1 is turned off); when the backlight of the empty region VR is to be turned off, the second light-emitting element 130 in the minimum light-emitting ring RI1 in the minimum annular region RR may be turned off (i.e., the second light-emitting element 130 in the first light-emitting group LE1 is turned off), but not limited thereto.

The display layer 180 may include a plurality of layers and structures, such that the display layer 180 may include a plurality of display units 180u in the display region DR as sub-pixels in the display region DR. In detail, in the case that the display device 100 is a liquid crystal display device, the display unit 180u may include a display element, a thin film transistor, and other suitable elements (such as a capacitor), for example. The electronic devices in the display unit 180u may be electrically connected to a display driving circuit (e.g., a gate driving circuit (integrated gate IGD)) and/or a chip (integrated circuit) in the peripheral region through the data lines and/or the scan lines in the display layer 180, so that the display driving circuit in the peripheral region may drive the electronic devices in the display unit 180u to display the image. In this embodiment, each display module may include a portion of a display medium layer (for example, but not limited to, a liquid crystal layer), a pixel electrode, and a common electrode, wherein the pixel electrode and the common electrode may generate an electric field through a received display voltage to affect an optical characteristic of the display medium layer, so as to control a transmittance of light emitted from the backlight module BL to the portion of the display medium layer, and further control a brightness of each display unit 180u, but not limited to this. In addition, the display units 180u may be arranged in any suitable manner, such as a matrix, but not limited thereto.

When the display layer 180 is displaying images, the backlight module BL may turn off the backlight of a specific sub-region (e.g., the ring region RR and/or the empty region VR) according to the requirement. For example, when a part of the display region DR displays a black image (for example, the display unit 180u in the region needs to display an image with a gray scale of 0), and the black image corresponds to at least one sub-region of the backlight module BL, the backlight control assembly 150 may be controlled to turn off the backlight of the sub-region(s) of the backlight module BL.

In addition, the display layer 180 of the display device 100 may also include other suitable film layers or components. In some embodiments, the display layer 180 may further include a shielding layer for shielding opaque elements (e.g., thin film transistors, data lines, and scan lines) to reduce the probability of external light being reflected by the opaque elements, wherein the shielding layer may be a single-layer structure or a multi-layer structure. The shielding layer may have a plurality of openings, and the shielding layer may define a top view shape of the light emitting region of the display unit 180u through the openings and partition the display unit 180 u. In some embodiments, the display layer 180 may further include a color conversion layer disposed in the display unit 180u (e.g., disposed in the opening of the shielding layer) to convert the color of the light generated by the backlight module BL into other desired colors. For example, when the display device 100 is a color display device 100, the color conversion layer may include color conversion portions with different colors, for example, the color conversion layer may include a plurality of red conversion portions, a plurality of green conversion portions, and a plurality of blue conversion portions, which are respectively disposed in different display units 180u, but not limited thereto, the color of the conversion portion included in the color conversion layer may be changed according to the requirement, for example, the color conversion portion may selectively include a yellow conversion portion. For another example, when the display device 100 is a monochrome display device 100, the display layer 180 may not include a color conversion layer so that the color of the backlight is not converted, or the display layer 180 may include a conversion portion including one color so that the display device 100 is the monochrome display device 100 of this color.

In addition, the display device 100 may also optionally include other suitable film layers, structures, or components. The display device 100 may further optionally include another substrate disposed between the backlight module BL and the display layer 180. The display device 100 may further optionally include an opposite substrate, and the display layer 180 is disposed between the backlight module BL and the opposite substrate. The display device 100 may also optionally include an optical film such as a polarizer, an anti-reflective film, or other suitable film.

In the present invention, since the first and second

light emitting members

120 and 130 are disposed in the backlight module BL, the number of light emitting members in the backlight module BL can be reduced and the backlight can be uniformized under the condition of the backlight module BL having the function of local dimming. In addition, the backlight module BL may have an empty region VR without any light emitting element, and the empty region VR is backlit by the second light emitting element 130, wherein the shape of the empty region VR may be a regular shape or an irregular shape.

In the present invention, the display device 100 may be manufactured in any suitable manner. An example of a method for manufacturing the display device 100 will be described below, but the invention is not limited thereto. In the manufacturing process of the backlight module BL, the first and second

light emitting members

120 and 130 are disposed or formed on the upper surface 110s of the substrate 110. Thereafter, a light guide structure 140 is disposed or formed on the upper surface 110s of the substrate 110, wherein the light guide structure 140 may be made to have any suitable structure by any suitable manufacturing method. For example, the light guide structure 140 of fig. 1 has a through hole 140h, and the through hole 140h may be aligned with the first light emitting element 120 and the second light emitting element 130, such that the first light emitting element 120 and the second light emitting element 130 are located in the through hole 140h, but not limited thereto. Also, the backlight control assembly 150 and other required conductive traces may be disposed at any suitable position in the backlight module BL, so that the backlight control assembly 150 electrically connects the first light emitting element 120 and the second light emitting element 130. Then, a display layer 180 having a plurality of display units 180u is formed on the backlight module BL, wherein the display layer 180 may be disposed on another substrate, and then the other substrate is disposed on the backlight module BL, but not limited thereto.

The method of manufacturing the display device 100 of the present invention may further include other steps, and the step(s) may be performed before or after any of the above steps, or may be performed between any two of the above steps. In addition, the steps of the manufacturing method of the display device 100 described above may be adjusted or changed in the execution order without departing from the spirit and principles of the present invention.

The display device of the present invention is not limited to the above-described embodiments. In order to simplify the description and to highlight the differences between the embodiments and the variant embodiments, the same components are labeled with the same reference numerals, and repeated descriptions are omitted.

Referring to fig. 7, fig. 7 is a schematic top view illustrating a first light emitting group and a vacant area of a backlight module of a display device according to a second embodiment of the invention. As shown in fig. 7, the difference between the present embodiment and the first embodiment is the shape of the empty region VR of the backlight module BL of the display device 200. In this embodiment, the shape of the empty region VR is a shape including at least one curved edge. For example, in fig. 7, two sides of the shape of the empty region VR are straight lines, and the other two sides are circular arcs, but not limited thereto. In addition, the shape of the annular region RR may correspond to the shape of the empty region VR, or the shape of the annular region RR may be a circular ring, but is not limited thereto. Similar to the first embodiment, the first light-emitting group LE1 surrounds the empty region VR, and the backlight of the empty region VR is provided by the second light-emitting element 130 of the first light-emitting group LE1, but not limited thereto.

Referring to fig. 8, fig. 8 is a schematic top view illustrating a backlight module of a display device according to a third embodiment of the invention. As shown in fig. 8, the present embodiment is different from the first embodiment in the arrangement of the light emitting elements of the backlight module BL of the display device 300. In the present embodiment, the first light-emitting element 120 of one light-emitting ring RI is not aligned with the first light-emitting element 120 of another light-emitting ring RI (the first light-emitting elements 120 of two adjacent light-emitting rings RI are arranged in a staggered manner in a direction toward the center of the display area DR), but is aligned with the first light-emitting element 120 of another light-emitting ring RI that is separated by one light-emitting ring RI. For example, each of the first light-emitting devices 120 of the light-emitting rings RI may be respectively aligned with one of the first light-emitting devices 120 of another light-emitting ring RI that is separated by one light-emitting ring RI in a direction toward the center of the display area DR, but the invention is not limited thereto.

Referring to fig. 9 and 10, fig. 9 is a schematic top view of a backlight module of a display device according to a fourth embodiment of the present invention, and fig. 10 is a schematic top view of a conventional backlight module, wherein all light emitting elements of the conventional backlight module BL' shown in fig. 10 are first light emitting elements 120 arranged in a matrix, and all the partitions of the display area DR are arranged in a matrix. For convenience of illustration, the square light emitting element in fig. 9 and 10 is the first light emitting element 120, and the rectangular light emitting element in fig. 9 is the second light emitting element 130, but the shape of the light emitting element is not limited thereto. The difference between the embodiment shown in fig. 9 and the first embodiment is the shape of the display region DR of the display device 400, and the shape of the display region DR of the conventional backlight module BL' shown in fig. 10 is the same as that of fig. 9, wherein two sides of the shape of the display region DR of fig. 9 and 10 are straight lines, and the other two sides are circular arcs (for example, the shape of a dashboard for a vehicle), but not limited thereto. It should be noted that, for clarity of the drawings, fig. 9 and 10 only show the right half of the display region DR, and the left half of the display region DR and the right half of the display region DR are symmetrical to each other.

In fig. 9, the display region DR may include a first region R1 and a second region R2, the first region R1 is circular, and the second region R2 is a region other than the first region R1 in the display region DR. The arrangement of the light emitting elements in the first region R1 of fig. 9 can refer to the first embodiment and the third embodiment of the present invention, and will not be repeated herein. In the second region R2 of fig. 9, the backlight module BL may include two empty regions VR _1 and VR _2 with irregular shapes, wherein the empty regions VR _1 and VR _2 are surrounded by two straight edges and one curved edge (circular arc) (the empty regions VR _1 and VR _2 of fig. 9 can also be regarded as shapes including at least one curved edge). Similarly, neither the first light emitting element 120 nor the second light emitting element 130 is disposed in the empty regions VR _1 and VR _2, and the second light emitting element 130 located outside the empty regions VR _1 and VR _2 and within the second region R2 can illuminate the empty regions VR _1 and VR _2, so that the empty regions VR _1 and VR _2 can provide uniform backlight. For example, as shown in fig. 9, the second region R2 may include a first light emitting group LE1, and the second light emitting element 130 in the first light emitting group LE1 may irradiate the empty regions VR _1 and VR _2, but not limited thereto.

As shown in fig. 9 and 10, the number of light emitting devices of the backlight module BL shown in fig. 9 is significantly less than that of the backlight module BL shown in fig. 10, and therefore, the arrangement of the light emitting devices of the present invention can reduce the number of light emitting devices required by the backlight module BL. In addition, according to the configuration of the light emitting device of the present invention, the partition of the display region DR may be designed to have a regular shape or an irregular shape according to the requirement, so that the dimming limitation of the function of local dimming is reduced.

Referring to fig. 11, fig. 11 is a schematic cross-sectional view of a display device according to a fifth embodiment of the invention. As shown in fig. 11, the difference between the present embodiment and the first embodiment lies in the design of the light guide structure 140 of the display device 500. In the present embodiment, the light guide structure 140 may include a plurality of grooves 140n, and the first light emitting element 120 and the second light emitting element 130 are located in the grooves 140n, but not limited thereto. Accordingly, since the first light emitting element 120 and the second light emitting element 130 are located in the groove 140n, most or all of the light emitted by the first light emitting element 120 and the second light emitting element 130 is emitted into the light guide structure 140. That is, in the embodiment of fig. 11, the light guide structure 140 adjusts the optical path of most or all of the light rays emitted by the first light emitting element 120 and the second light emitting element 130, but not limited thereto.

Referring to fig. 12, fig. 12 is a schematic cross-sectional view of a display device according to a sixth embodiment of the invention. As shown in fig. 12, the difference between the present embodiment and the first embodiment lies in the design of the light guide structure 140 of the display device 600. In the embodiment, the light guide structure 140 includes a plurality of through holes 140h and a plurality of grooves 140n, the first light emitting element 120 is located in the through hole 140h, and the second light emitting element 130 is located in the groove 140n, but not limited thereto. In fig. 12, since the second light-emitting element 130 is located in the groove 140n and the second light-emitting surface 130a faces the sidewall of the groove 140n of the light-guiding structure 140, most or all of the light emitted by the second light-emitting element 130 is incident into the light-guiding structure 140. In addition, in fig. 12, since the first light emitting element 120 is located in the through hole 140h, the first light emitting surface 120a is not overlapped with the light guide structure 140, so that only a small amount of light of the light emitted by the first light emitting element 120 may enter the light guide structure 140, or the light emitted by the first light emitting element 120 may not enter the light guide structure 140. That is, in the embodiment of fig. 12, the light guide structure 140 adjusts the optical path of most or all of the light emitted by the second light emitting element 130, and the light guide structure 140 may not adjust the optical path of the light emitted by the first light emitting element 120 or adjust the optical path of only a small amount of light, but not limited thereto.

Referring to fig. 13 and 14, fig. 13 is a cross-sectional view of a display device according to a seventh embodiment of the invention, and fig. 14 is a cross-sectional view of a substrate, a second light emitting element and a light guide structure of the display device according to the seventh embodiment of the invention. As shown in fig. 13, the difference between the present embodiment and the first embodiment lies in the design of the light guide structure 140 of the display device 700. In the present embodiment, the light guide structure 140 is disposed on the first light emitting element 120 and the second light emitting element 130. Since the light guide structure 140 is disposed on the first light emitting element 120, most or all of the light emitted from the first light emitting element 120 is incident into the light guide structure 140. Optionally, the display device 700 may include a reflective structure for reflecting at least a portion of the light emitted from the second light emitting element 130 to the light guiding structure 140 and the display layer 180, but is not limited thereto.

In addition, as shown in fig. 13 and 14, the light guide structure 140 further optionally includes at least one light-reducing member 146 disposed on a side of the plate 142 adjacent to the substrate 110 and/or a side away from the substrate 110, wherein the light-reducing member 146 is adjacent to the second light-emitting surface 130a of the second light-emitting member 130 in a top view, so as to prevent the portion of the light guide structure 140 adjacent to the second light-emitting surface 130a from having too high brightness, and further improve the uniformity of the backlight module BL.

In some embodiments, the diffusing dots 144 of the light guide structure 140 and the light attenuating elements 146 of the light guide structure 140 comprise the same material, but are not limited thereto. In some embodiments, the top view shape of the light attenuating member 146 of the light guiding structure 140 may be any suitable shape. For example, the top view shape of the diffusing dots 144 may be circular, and the top view shape of the light attenuating element 146 may be rectangular, but not limited thereto.

In summary, in the present invention, since the first light emitting device and the second light emitting device are disposed in the backlight module, the number of light emitting devices in the backlight module can be reduced and the backlight can be uniformized under the condition of the backlight module having the function of local dimming. In addition, the backlight module can be provided with an empty area without any light emitting element, and the empty area of the second light emitting element is used for providing light to be used as backlight of the empty area, wherein the shape of the empty area can be a conventional shape or an irregular shape. According to the configuration of the light emitting member of the present invention, the partition of the display area can be designed into a regular shape or an irregular shape according to the requirement, so that the dimming limitation of the function of local dimming is reduced.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display device, wherein the display device has a display area, and the display device comprises:

a backlight module, comprising:

a substrate having an upper surface;

a plurality of first light-emitting elements disposed on the upper surface of the substrate and in the display area, wherein each of the first light-emitting elements has a first light-emitting surface, and each of the first light-emitting surfaces is parallel to the upper surface of the substrate;

a plurality of second light-emitting members disposed on the upper surface of the substrate and in the display area, wherein each of the second light-emitting members has a second light-emitting surface perpendicular to the upper surface of the substrate;

a light guide structure disposed on the upper surface of the substrate, wherein light emitted by the second light emitting element is incident into the light guide structure; and

the backlight control assembly is electrically connected with the first light-emitting piece and the second light-emitting piece and is used for respectively controlling the on-off states of the first light-emitting piece and the second light-emitting piece; and

and the display layer is arranged on the backlight module and comprises a plurality of display units in the display area.

2. The display device of claim 1, wherein the backlight module comprises at least one first light emitting group, each of the first light emitting groups comprises one of the first light emitting elements and one of the second light emitting elements, and the first light emitting elements and the second light emitting elements in each of the first light emitting groups are disposed adjacent to each other.

3. The display device as claimed in claim 2, wherein the backlight module has a void region, the first light-emitting elements and the second light-emitting elements are not disposed in the void region, and the second light-emitting surface of the second light-emitting element of the first light-emitting group faces the void region.

4. The display device according to claim 3, wherein the at least one first light emitting group comprises a plurality of first light emitting groups, and the plurality of first light emitting groups surround the empty region.

5. The display device according to claim 2, wherein in the first light emitting group, a shortest distance between an edge of the first light emitting member and a center of the second light emitting member is 1 to 10 mm.

6. The display device of claim 1, wherein the backlight module comprises at least one second light emitting group, each of the second light emitting groups comprising one of the first light emitting elements and two of the second light emitting elements, and wherein the first light emitting element and the two second light emitting elements are disposed adjacent to each other and the first light emitting element is disposed between the two second light emitting elements in each of the second light emitting groups.

7. The display device of claim 6, wherein the second light emitting group is adjacent to an edge of the display area.

8. The display device according to claim 6, wherein the first light emitting element and the two second light emitting elements are arranged in an arrangement direction in the second light emitting group.

9. The display device according to claim 8, wherein an angle between an edge of one of the two second light emitting members and a vertical direction perpendicular to the arrangement direction perpendicular to a normal direction of the substrate is from-30 degrees to 30 degrees.

10. The display device according to claim 6, wherein in the second light emitting group, a shortest distance between an edge of the first light emitting member and a center of one of the two second light emitting members is 1 to 10 mm.

11. The display device according to claim 1, wherein the backlight module further comprises a plurality of light emitting rings, each of the light emitting rings being arranged by a part of the plurality of first light emitting members or by a part of the plurality of first light emitting members and a part of the plurality of second light emitting members.

12. The display device of claim 11, wherein the backlight module comprises a plurality of first light emitting groups, each of the first light emitting groups comprises one of the plurality of first light emitting elements and one of the plurality of second light emitting elements, and the first light emitting elements and the second light emitting elements in each of the first light emitting groups are disposed adjacent to each other, wherein the plurality of first light emitting groups are arranged as a minimum light emitting ring of the plurality of light emitting rings.

13. The display device of claim 11, wherein the backlight module comprises a plurality of second light emission groups, each of the second light emission groups comprising one of the plurality of first light emitting members and two of the plurality of second light emitting members, the first light emitting member and the two second light emitting members being disposed adjacent to each other and the first light emitting member being disposed between the two second light emitting members in each of the second light emission groups, wherein the plurality of second light emission groups are arranged in a largest light emission ring of the plurality of light emission rings.

14. The display device of claim 1, wherein the light guide structure includes a plurality of through holes, the first and second light emitting elements being positioned in the through holes.

15. The display apparatus of claim 1, wherein the light guide structure comprises a plurality of grooves, the first and second light emitting members being located in the grooves.

16. The display device of claim 1, wherein the light guide structure comprises a plurality of perforations and a plurality of grooves, the first light emitting element being located in the perforations and the second light emitting element being located in the grooves.

17. The display device of claim 1, wherein the light guide structure is disposed on the first light emitting member and the second light emitting member.

18. The display apparatus of claim 1, wherein the light guide structure comprises at least one light reducing member adjacent to the second light emitting member in a top view.

19. The display device of claim 18, wherein the light directing structure further comprises a plurality of diffusive dots comprising the same material as the light attenuating element.

20. The display device of claim 1, wherein the display area is irregularly shaped or comprises at least one curved edge.