Display device

Abstract

The invention provides a display device which comprises a display module and a backlight module. The display module has a display area. The backlight module is overlapped with the display module and comprises a plurality of light-emitting diodes. A light-emitting area is defined by the multiple light-emitting diodes. The light-emitting area is overlapped with the display area, and the area of the light-emitting area is larger than that of the display area.

Description

Technical Field

[0001] The present invention relates to an electronic device, and in particular to a display device. Background Art

[0002] In existing display devices, the arrangement of light-emitting elements causes a backlight module to have a dark area around it or uneven brightness, which has a negative impact on display quality. Summary of the invention

[0003] The invention provides a display device, which helps to improve the problem of surrounding dark area or uneven brightness.

[0004] According to an embodiment of the present invention, a display device includes a backlight module and a display module. The display module has a display area. The backlight module and the display module are arranged overlappingly and include a plurality of light emitting diodes. The plurality of light emitting diodes surround a light emitting area. The light emitting area overlaps with the display area, and the area of ​​the light emitting area is larger than the area of ​​the display area.

[0005] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 as well as Figure 2 They are respectively a partial top view and a cross-sectional view of a display device according to a first embodiment of the present invention;

[0007] Figure 3 is a partial top view schematic diagram of a display device according to a second embodiment of the present invention;

[0008] Figure 4 is a partial top view schematic diagram of a display device according to a third embodiment of the present invention;

[0009] Figure 5 as well as Figure 6 1 and 2 are respectively a partial top view and a cross-sectional view of a display device according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0010] 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 the description to refer to the same or like parts.

[0011] Certain words are used throughout the specification and claims to refer to specific components. It should be understood by those skilled in the art that electronic device manufacturers may refer to the same components by different names. It is not intended to distinguish between components that have the same function but different names. In the following specification and claims, the words "including" and "comprising" are open-ended words and should be interpreted as "including but not limited to...".

[0012] The directional terms mentioned herein, such as "up", "down", "front", "back", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional terms used are for illustration and not for limiting the present invention. In the drawings, each figure shows the general characteristics of the methods, structures and / or materials used in a particular embodiment. However, these drawings should not be interpreted as defining or limiting the scope or nature covered by these embodiments. For example, for clarity, the relative size, thickness and position of each film layer, region and / or structure may be reduced or enlarged.

[0013] A structure (or layer, element, substrate) described in the present invention is located on / above another structure (or layer, element, substrate), which may refer to the two structures being adjacent and directly connected, or it may refer to the two structures being adjacent but not directly connected. Indirect connection means that there is at least one intermediate structure (or intermediate layer, intermediate element, intermediate substrate, intermediate interval) between the two structures, the lower surface of one structure is adjacent to or directly connected to the upper surface of the intermediate structure, and the upper surface of the other structure is adjacent to or directly connected to the lower surface of the intermediate structure. The intermediate structure may be composed of a single-layer or multi-layer physical structure or a non-physical structure, without limitation. In the present invention, when a certain structure is disposed "on" another structure, it may refer to that the certain structure is "directly" on the other structure, or that the certain structure is "indirectly" on the other structure, that is, at least one structure is sandwiched between the certain structure and the other structure.

[0014] The terms "approximately", "equal to", "equal to" or "same", "substantially" or "approximately" are generally interpreted as within 20% of a given value or range, or within 10%, 5%, 3%, 2%, 1% or 0.5% of a given value or range. In addition, the phrases "a range is from a first value to a second value", "a range is between a first value and a second value" indicate that the range includes the first value, the second value and other values ​​therebetween.

[0015] The ordinal numbers used in the specification and claims, such as "first", "second", etc., are used to modify the elements. They do not imply or represent any previous ordinal numbers of the element (or elements), nor do they represent the order of one element and another element, or the order of the manufacturing method. The use of these ordinal numbers is only used to make the element with a certain name clearly distinguishable from another element with the same name. The claims and the specification may not use the same words. Accordingly, the first component in the specification may be the second component in the claim.

[0016] The electrical connection or coupling described in the present invention may refer to direct connection or indirect connection. In the case of direct connection, the endpoints of the components on the two circuits are directly connected or connected to each other by a conductor segment, and in the case of indirect connection, there is a switch, diode, capacitor, inductor, resistor, other suitable components, or a combination of the above components between the endpoints of the components on the two circuits, but it is not limited thereto.

[0017] In the present invention, the thickness, length and width can be measured by an optical microscope (OM), and the thickness or width can be measured by a cross-sectional image in an electron microscope, but it is not limited thereto. In addition, any two values ​​or directions used for comparison may have a certain error. In addition, the term "substantially" or "approximately" mentioned in the present invention usually represents a range of 10% within a given value or range. In addition, the term "a given range is a first value to a second value", "a given range falls within the range of a first value to a second value" or "a given range is between a first value and a second value" means that the given range includes the first value, the second value and other values ​​therebetween. If the first direction is perpendicular to the second direction, the angle between the first direction and the second direction may be between 80 degrees and 100 degrees; if the first direction is parallel to the second direction, the angle between the first direction and the second direction may be between 0 degrees and 10 degrees.

[0018] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the background or context of the relevant technology and the present invention, and should not be interpreted in an idealized or overly formal manner unless specifically defined in the embodiments of the present invention.

[0019] In the present invention, the electronic device may include a display device, a backlight device, an antenna device, a sensing device or a splicing device, but is not limited thereto. The electronic device may be a bendable or flexible electronic device. The display device may be a non-self-luminous display device or a self-luminous display device. The display device may, for example, include liquid crystal, light-emitting diode, fluorescence, phosphor, quantum dot (QD), other suitable display media or a combination of the foregoing. The antenna device may, for example, include a frequency selective surface (FSS), a radio frequency filter, a polarizer, a resonator or an antenna, etc. The antenna may be a liquid crystal antenna or a non-liquid crystal antenna. The sensing device may be a sensing device for sensing capacitance, light, heat or ultrasound, but is not limited thereto. In the present invention, the electronic device may include electronic components, and the electronic components may include passive components and active components, such as capacitors, resistors, inductors, diodes, transistors, etc. The diode may include a light-emitting diode or a photodiode. The light emitting diode may include, for example, an organic light emitting diode (OLED), a sub-millimeter light emitting diode (mini LED), a micro LED or a quantum dot light emitting diode (quantum dotLED), but is not limited thereto. The splicing device may be, for example, a display splicing device or an antenna splicing device, but is not limited thereto. It should be noted that the electronic device may be any arrangement or combination of the foregoing, but is not limited thereto. In addition, the appearance of the electronic device may be rectangular, circular, polygonal, a shape with curved edges or other suitable shapes. The electronic device may have peripheral systems such as a drive system, a control system, a light source system, etc. to support a display device, an antenna device, a wearable device (for example, including augmented reality or virtual reality), a vehicle-mounted device (for example, including a car windshield) or a splicing device.

[0020] It should be noted that the following embodiments can replace, reorganize, or mix features in several different embodiments to complete other embodiments without departing from the spirit of the present invention. The features between the embodiments can be mixed and matched as long as they do not violate the spirit of the invention or conflict with each other.

[0021] Figure 1 as well as Figure 2 They are respectively a partial top view and a cross-sectional view of a display device according to a first embodiment of the present invention. Figure 1 as well as Figure 2The display device 1 may include a display module 10 and a backlight module 12. The display module 10 has a display area RD. The backlight module 12 is arranged to overlap with the display module 10 and includes a plurality of light emitting diodes 120. The plurality of light emitting diodes 120 surround a light emitting area RE. The light emitting area RE overlaps with the display area RD, and the area of ​​the light emitting area RE is larger than the area of ​​the display area RD.

[0022] In detail, the display module 10 may be a non-self-luminous display module, such as a liquid crystal display module, but is not limited thereto. The display region RD of the display module 10 is an area where the display module 10 provides an image for display. Although not shown, the display region RD may include a plurality of pixels and a color filter layer, but is not limited thereto. The plurality of pixels may be arranged in an array along the direction X and the direction Y, and the color filter layer may overlap with the plurality of pixels in the direction Z.

[0023] In addition to the display area RD, Figure 2 As shown, the display module 10 may also have a peripheral area RP, and the peripheral area RP may be located on at least one side of the display area RD. In some embodiments, the peripheral area RP may surround the display area RD, but is not limited thereto. The peripheral area RP of the display module 10 is an area outside the display area RD. Although not shown, the peripheral area RP may include a plurality of routing lines and peripheral lines.

[0024] The backlight module 12 is arranged to overlap with the display module 10 in the thickness direction (eg, direction Z) of the display device 1. Figure 2 As shown, the backlight module 12 can be a direct-type backlight module, and the backlight module 12 can be arranged below the display module 10, wherein the display area RD of the display module 10 is overlapped with the multiple light-emitting diodes 120 of the backlight module 12 in the direction Z, so that the display area RD can receive the light beams emitted from the multiple light-emitting diodes 120 and convert the light beams into display light beams with display information (such as grayscale, color).

[0025] The plurality of light emitting diodes 120 may be arranged in an array along the direction X and the direction Y. In some embodiments, the light emitting angle of the light emitting diode 120 may be between 110 degrees and 160 degrees, that is, 110 degrees ≦ light emitting angle ≦ 160 degrees, but not limited thereto. In some embodiments, the brightness directly above the light emitting diode 120 (zenith angle of 0 degrees) is less than the brightness at a zenith angle of 30 degrees to 70 degrees, but not limited thereto. In some embodiments, the maximum brightness of the light emitting diode 120 is between a zenith angle of 55 degrees and 80 degrees, but not limited thereto.

[0026] The largest rectangle surrounded by the plurality of LEDs 120 defines a light emitting area RE. Figure 1 In the figure, the light emitting area RE is indicated by a dotted line, and the display area RD is indicated by a dotted line. Figure 1As shown, the emission region RE overlaps with the display region RD in the direction Z, and the area of ​​the emission region RE is larger than the area of ​​the display region RD. Figure 1 It is schematically shown that the four edges of the light-emitting region RE expand outwards from the four edges of the display region RD, that is, each of the multiple light-emitting diodes 120 located at the four edges of the light-emitting region RE is at least partially located outside the display region RD, but the present invention is not limited thereto. In other embodiments, although not shown, each of the multiple light-emitting diodes 120 located at at least one edge may be completely located outside the display region RD, completely located inside the display region RD, or partially located inside the display region and partially located outside the display region.

[0027] By making the area of ​​the light-emitting region RE larger than the area of ​​the display region RD, the brightness of the edge region can be increased, which helps to improve the problem of surrounding dark areas or uneven brightness. In some embodiments, the difference between the length L1 of the light-emitting region RE and the length L2 of the display region RD (e.g., L1-L2) can be greater than 0 and less than or equal to 10 mm, so as to increase the brightness uniformity to more than 50%, for example, 50% to 90%. In some embodiments, the difference between the width W1 of the light-emitting region RE and the width W2 of the display region RD (e.g., W1-W2) can be greater than 0 and less than 10 mm, so as to increase the brightness uniformity to more than 50%, for example, 50% to 90%.

[0028] According to different requirements, the backlight module 12 may further include other components or film layers. Figure 2 As shown, the backlight module 12 may further include a back plate 121 , a circuit board 122 , a chip 123 , a reflective sheet 124 and an optical film 125 , but the present invention is not limited thereto.

[0029] The back plate 121 is used to accommodate the display module 10, the plurality of light emitting diodes 120, the circuit board 122, the chip 123, the reflective sheet 124 and the optical film 125. For example, the material of the back plate 121 may include metal, alloy, plastic or a combination thereof.

[0030] The back plate 121 includes a bottom BP, a side wall portion WP and a bearing portion CP, wherein the side wall portion WP is connected to the bottom BP, the bearing portion CP is located above the bottom BP and extends from the side wall portion WP toward the center of the back plate 121, so that the accommodating space SP of the back plate 121 is divided into a lower space SP1 and an upper space SP2 by the bearing portion CP, and the lower space SP1 is located between the upper space SP2 and the bottom BP.

[0031] The circuit board 122 is disposed on the bottom BP of the back plate 121 and is located in the lower space SP1 . The plurality of light emitting diodes 120 are disposed on the circuit board 122 and are electrically connected to the chip 123 located between the circuit board 122 and the bottom BP of the back plate 121 through the circuit board 122 . Figure 2Schematically showing three chips 123, and the dashed arrows show the electrical signal transmission paths between the chips 123 and the corresponding light emitting diodes 120. However, it should be understood that the number of chips 123 and the relative arrangement relationship between the chips 123 and the plurality of light emitting diodes 120, the number of connections, the electrical signal transmission paths, etc. can be changed according to actual needs.

[0032] The reflective sheet 124 is disposed on the side wall portion WP of the back plate 121 to reflect the light beam so that the light beam is transmitted toward the display module 10. The material of the reflective sheet 124 may include metal, alloy, high reflective paint (such as white paint) or a combination thereof, but is not limited thereto. In some embodiments, the maximum lateral distance D1 between the reflective sheet 124 and the display area RD of the display module 10 is, for example, between 1 mm and 10 mm to reduce the possibility of light leakage caused by reflected light.

[0033] The optical film 125 is disposed on the carrier portion CP and is located in the upper space SP2. In addition, the optical film 125 can maintain an appropriate light mixing distance D2 with the plurality of light emitting diodes 120 in the direction Z through the carrier portion CP. The light mixing distance may vary depending on design parameters / specifications such as the thickness of the backlight module 12, the arrangement of the plurality of light emitting diodes 120, brightness, brightness uniformity, etc., and is not limited here.

[0034] Figure 2 The schematic diagram shows four optical films 125 stacked in the direction Z. However, it should be understood that the number and type of the optical films 125 can be changed according to actual needs. For example, the optical films 125 can be selected from diffusion films or prism films, but are not limited thereto.

[0035] According to different requirements, the display device 1 may further include other components or film layers. Figure 2 As shown, the display device 1 may further include a cover plate 14. The cover plate 14 is disposed on the side wall portion WP of the back plate 121 and covers the display module 10. The material of the cover plate 14 includes, for example, glass, quartz, ceramic, sapphire or plastic, but is not limited thereto. The plastic may include polycarbonate (PC), polyimide (PI), polypropylene (PP), polyethylene terephthalate (PET), other suitable flexible materials or a combination of the foregoing materials, but is not limited thereto.

[0036] Figure 3 FIG. 1 is a partial top view of a display device according to a second embodiment of the present invention. Figure 3 Only a plurality of light emitting diodes 120 are schematically shown and other components are omitted. Figure 3, the display device 1A and Figure 1 The main difference between the display device 1 and the display device 1 is the arrangement of the plurality of light emitting diodes 120 .

[0037] In detail, in the display device 1A, the light-emitting region RE includes a first unit region U1 and a second unit region U2, and the area of ​​the first unit region U1 is equal to the area of ​​the second unit region U2. For easy identification, the second unit region U2 is represented by a dotted shading, while the first unit region U1 is represented by a blank shading. Although not shown, the first unit region U1 and the second unit region U2 can be defined by interlaced wires (such as signal lines, common electrode lines or power lines, etc.), retaining walls or marking lines. On the other hand, when the light-emitting region RE lacks a partitioning element to define a unit region, two center lines M1 extending along the direction X and two center lines M2 extending along the direction Y can be shown from a plurality of light-emitting diodes 120 at the central region of the light-emitting region RE, wherein each center line M1 is located in the middle of two adjacent light-emitting diodes 120 arranged in the direction Y, and each center line M2 is located in the middle of two adjacent light-emitting diodes 120 arranged in the direction X, and the two center lines M1 and the two center lines M2 are interlaced with each other to define a unit region.

[0038] By controlling the density of the light emitting diodes 120 in different unit areas, the problem of surrounding dark areas or uneven brightness can be improved. Figure 3 For example, the light-emitting area RE may include a plurality of first unit areas U1 and a plurality of second unit areas U2, and the plurality of second unit areas U2 may surround the plurality of first unit areas U1. Under this architecture, the density of the light-emitting diodes 120 in the second unit area U2 may be greater than the density of the light-emitting diodes 120 in the first unit area U1, so as to increase the brightness of the edge area, thereby improving the problem of dark areas or uneven brightness around. In this article, the density of light-emitting diodes in a unit area refers to the area occupied by the light-emitting diodes in the unit area. The larger the area occupied by the light-emitting diodes in the unit area, the greater the density of the light-emitting diodes in the unit area; conversely, the smaller the area occupied by the light-emitting diodes in the unit area, the smaller the density of the light-emitting diodes in the unit area.

[0039] The density of the LEDs in the unit area can be changed by changing the number of LEDs in the unit area, changing the size of the LEDs in the unit area, or a combination of the above. Figure 3 For example, the number of LEDs 120 in the second unit area U2 may be greater than the number of LEDs 120 in the first unit area U1, so that the density of the LEDs 120 in the second unit area U2 is greater than the density of the LEDs 120 in the first unit area U1, but the present invention is not limited thereto. Figure 5As shown, the size of the LEDs 120 in the second unit area U2 can be made larger than that of the LEDs 120 in the first unit area U1 , so that the density of the LEDs 120 in the second unit area U2 is greater than that of the LEDs 120 in the first unit area U1 .

[0040] In some embodiments, although not shown, the edge of the light emitting area may expand outward from the edge of the display area (eg, Figure 1 In the case of a structure in which the edge of the light emitting area is aligned with the edge of the display area or the edge of the light emitting area is reduced inward from the edge of the display area, the density of the light emitting diodes 120 located at the edge of the light emitting area can be further increased to further improve the brightness of the edge area. Alternatively, in the case in which the edge of the light emitting area is aligned with the edge of the display area or the edge of the light emitting area is reduced inward from the edge of the display area, the density of the light emitting diodes 120 located at the edge of the light emitting area can be further increased to further improve the brightness of the edge area.

[0041] Figure 4 FIG. 1 is a partial top view of a display device according to a third embodiment of the present invention. Figure 4 Only a plurality of light emitting diodes 120 are schematically shown and other components are omitted. Figure 4 , the display device 1B and Figure 3 The main difference of the display device 1A is the arrangement of the plurality of light emitting diodes 120 .

[0042] Specifically, in the display device 1B, the light-emitting region RE further includes a plurality of third unit regions U3 (indicated by diagonal shading). The plurality of third unit regions U3 are respectively located at the four corners of the light-emitting region RE, and the density of the light-emitting diodes 120 in the third unit regions U3 is greater than the density of the light-emitting diodes 120 in the second unit regions U2. As described above, the density of the light-emitting diodes in the unit regions can be changed by changing the size, number, or combination of the light-emitting diodes in the unit regions. Figure 4 It is schematically shown that the number of LEDs 120 in the third unit area U3 is greater than the number of LEDs 120 in the second unit area U2, and the number of LEDs 120 in the second unit area U2 is greater than the number of LEDs 120 in the first unit area U1, but the method of changing the density of LEDs in the unit area is not limited to this.

[0043] By increasing the density of the light emitting diodes at the edge corners of the light emitting region RE, the brightness at the edge corners can be increased, which helps to improve the surrounding dark areas or uneven brightness problems.

[0044] Figure 5 as well as Figure 6They are respectively a partial top view and a cross-sectional view of a display device according to a fourth embodiment of the present invention. Figure 5 as well as Figure 6 , the display device 1C and Figure 3 The main differences of the display device 1A are described as follows. In the display device 1C, the density of the light-emitting diodes 120 in the second unit area U2 is made greater than the density of the light-emitting diodes 120 in the first unit area U1 by making the size of the light-emitting diodes 120 in the second unit area U2 greater than the size of the light-emitting diodes 120 in the first unit area U1.

[0045] In addition, the pitches of the plurality of light emitting diodes 120 are the same. For example, the plurality of light emitting diodes 120 have the same pitch Px in direction X, and the plurality of light emitting diodes 120 have the same pitch Py in direction Y, but the present invention is not limited thereto. The design of the plurality of light emitting diodes 120 having the same pitch can simplify the manufacturing process (such as bonding) or design (such as wiring).

[0046] In addition, the light-emitting diodes 120 in the first unit area U1 and the light-emitting diodes 120 in the second unit area U2 can be controlled by different chips. For example, the light-emitting diodes 120 in the first unit areas U1 can be controlled by the chips 123, and the light-emitting diodes 120 in the second unit areas U2 can be controlled by the chips 123', but the present invention is not limited thereto. By designing that the light-emitting diodes in different unit areas are controlled by different chips, the brightness of the light-emitting diodes in different unit areas can be independently controlled, thereby helping to improve the problem of dark areas or uneven brightness around. Although not shown, in Figure 3 as well as Figure 4 Under the architecture, light-emitting diodes located in different unit areas can also be controlled by different chips respectively.

[0047] In summary, in the embodiments of the present invention, by making the area of ​​the light-emitting area larger than the area of ​​the display area, the brightness of the edge area can be increased, which helps to improve the problem of surrounding dark areas or uneven brightness. In some embodiments, the problem of surrounding dark areas or uneven brightness can be further improved by changing the density of light-emitting diodes in a unit area or by designing that light-emitting diodes in different unit areas are controlled by different chips.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by 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.

[0049] Although the embodiments of the present invention and its advantages have been disclosed as above, it should be understood that any person skilled in the art can make changes, substitutions and modifications without departing from the spirit and scope of the present invention, and the features between the embodiments can be arbitrarily mixed and replaced with each other to form other new embodiments. In addition, the scope of protection of the present invention is not limited to the manufacturing process, machine, manufacturing, material composition, device, method and steps in the specific embodiment described in the specification. Any person skilled in the art can understand the current or future developed manufacturing process, machine, manufacturing, material composition, device, method and steps from the disclosure of the present invention, as long as they can implement substantially the same function or obtain substantially the same result in the embodiments described herein, they can all be used according to the present invention. Therefore, the scope of protection of the present invention includes the above-mentioned manufacturing process, machine, manufacturing, material composition, device, method and steps. In addition, each claim constitutes a separate embodiment, and the scope of protection of the present invention also includes the combination of each claim and embodiment. The scope of protection of the present invention shall be determined by the attached claims.

Claims

1. A display device, characterized in that: include: A display module having a display area; as well as A backlight module, arranged overlapping with the display module and comprising a plurality of light emitting diodes; The plurality of light emitting diodes form a light emitting area, the light emitting area overlaps with the display area, and the area of ​​the light emitting area is larger than the area of ​​the display area.

2. The display device according to claim 1, characterized in that A difference between the length of the light emitting area and the length of the display area is greater than 0 and less than or equal to 10 mm.

3. The display device according to claim 1, characterized in that The light-emitting area includes a plurality of first unit areas and a plurality of second unit areas, the area of ​​one of the plurality of first unit areas is equal to the area of ​​one of the plurality of second unit areas, and the density of the light-emitting diodes in one of the plurality of second unit areas is greater than the density of the light-emitting diodes in one of the plurality of first unit areas.

4. The display device according to claim 3, characterized in that: The plurality of second unit regions surround the plurality of first unit regions.

5. The display device according to claim 3, characterized in that: The light-emitting area further includes a plurality of third unit areas, which are respectively located at four corners of the light-emitting area, and a density of the light-emitting diodes in one of the plurality of third unit areas is greater than a density of the light-emitting diodes in one of the plurality of second unit areas.

6. The display device according to claim 3, characterized in that: The light emitting diodes in the plurality of first unit areas and the light emitting diodes in the plurality of second unit areas are respectively controlled by different chips.

7. The display device according to claim 3, characterized in that: The number of the light emitting diodes in one of the plurality of second unit regions is greater than the number of the light emitting diodes in one of the plurality of first unit regions.

8. The display device according to claim 3, characterized in that: A size of the light emitting diode in one of the plurality of second unit regions is greater than a size of the light emitting diode in one of the plurality of first unit regions.

9. The display device according to claim 1, characterized in that: The plurality of light emitting diodes have the same pitch.

Images