Backlight module and electronic device

Abstract

The present disclosure provides a backlight module and an electronic device. The backlight module has a main area and a peripheral area adjacent to the main area. The backlight module includes a light conversion layer, a plurality of light conversion patterns, and a plurality of light-emitting units. The plurality of light conversion patterns are located in the peripheral area. The plurality of light-emitting units emit light beams. The first portion of the light beam emitted from the main area has at least one corresponding position in the CIE1931 color space. The second portion of the light beam emitted from the peripheral area has at least one corresponding position in the CIE1931 color space. One of the at least one corresponding position of the first portion of the light beam has a corresponding coordinate (x1, y1). One of the at least one corresponding position of the second portion of the light beam has a corresponding coordinate (x2, y2), and the corresponding coordinate (x1, y1) and the corresponding coordinate (x2, y2) satisfy the following relationship: 0≦|x1‑x2|≦0.2.

Description

Technical Field

[0001] The present disclosure relates to a module and a device, and more particularly to a backlight module and an electronic device. Background Art

[0002] Backlight modules in electronic devices often use blue light-emitting units and a light conversion layer to generate white light. This architecture can cause white light color point shifts at the edges of the backlight module, resulting in inconsistent white light performance between the center and edge regions of the backlight module. Summary of the Invention

[0003] The present disclosure provides a backlight module and an electronic device, which are helpful to improve the problem of white light color point shift in the edge area of the backlight module.

[0004] According to an embodiment of the present disclosure, a backlight module has a main area and a peripheral area adjacent to the main area. The backlight module includes a light conversion layer, a plurality of light conversion patterns, and a plurality of light-emitting units. The plurality of light conversion patterns are located in the peripheral area. The plurality of light-emitting units emit light beams. The first portion of the light beam emitted from the main area has at least one corresponding position in the CIE1931 color space. The second portion of the light beam emitted from the peripheral area has at least one corresponding position in the CIE1931 color space. One of the at least one corresponding position of the first portion of the light beam has a corresponding coordinate (x1, y1). One of the at least one corresponding position of the second portion of the light beam has a corresponding coordinate (x2, y2), and the corresponding coordinate (x1, y1) and the corresponding coordinate (x2, y2) satisfy the following relationship: 0≦|x1-x2|≦0.2.

[0005] According to an embodiment of the present disclosure, an electronic device includes the aforementioned backlight module and a display panel disposed on the backlight module.

[0006] To make the above features and advantages of the present disclosure more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic cross-sectional view of an electronic device according to an embodiment of the present disclosure;

[0008] Figure 2 yes Figure 1 A top view of the backlight module;

[0009] Figure 3A and Figure 3B are first partial top views of different regions of a reflective layer on which a plurality of light conversion patterns are disposed;

[0010] Figure 4A and Figure 4B are second partial top views of different regions of the reflective layer on which a plurality of light conversion patterns are disposed;

[0011] Figure 5A and Figure 5B are third partial top views of different regions of the reflective layer on which a plurality of light conversion patterns are disposed;

[0012] Figure 6A and Figure 6B are fourth partial top views of different regions of the reflective layer on which a plurality of light conversion patterns are disposed;

[0013] Figure 7A and Figure 7B are fifth partial top views of different regions of the reflective layer on which a plurality of light conversion patterns are disposed;

[0014] Figure 8 is a schematic cross-sectional view of an electronic device according to another embodiment of the present disclosure;

[0015] Figure 9 yes Figure 8 A partially enlarged schematic diagram of the backlight module;

[0016] Figure 10 is a partial top view of a backlight module according to an embodiment of the present disclosure;

[0017] Figure 11 is a schematic cross-sectional view of a light conversion pattern. DETAILED DESCRIPTION

[0018] The present disclosure will be understood by referring to the following detailed description in conjunction with the accompanying drawings. It should be noted that, for ease of understanding and for simplicity, many of the drawings in this disclosure depict only portions of electronic devices / displays, and certain components in the drawings are not drawn to scale. Furthermore, the number and dimensions of components in the drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. For example, the relative sizes, thicknesses, and positions of various layers, regions, or structures may be reduced or exaggerated for clarity.

[0019] Throughout this disclosure and the following claims, certain terms are used to refer to specific components. Those skilled in the art will appreciate that electronic device manufacturers may refer to the same components by different names. This document does not intend to distinguish between components that have the same function but are named differently. In the following description and claims, words such as "having" and "including" are open-ended and should be interpreted as meaning "including, but not limited to..."

[0020] Directional terms mentioned herein, such as "upper," "lower," "front," "backward," "left," "right," etc., are used only with reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present disclosure. It should be understood that when an element or film layer is referred to as being "on" or "connected to" another element or film layer, the element or film layer may be directly on or directly connected to the other element or film layer, or there may be an intervening element or film layer between the two (indirect case). Conversely, when an element or film layer is referred to as being "directly on" or "directly connected to" another element or film layer, there may be no intervening element or film layer between the two.

[0021] The terms "approximately," "equal to," "equal to," "the same as," "substantially," or "approximately" mentioned herein generally represent falling within 10% of a given value or range, or falling within 5%, 3%, 2%, 1%, or 0.5% of a given value or range. In addition, the phrases "a given range is from a first value to a second value," and "a given range falls within the range from a first value to a second value" indicate that the given range includes the first value, the second value, and other values therebetween.

[0022] In the embodiments disclosed herein, terms such as "connection" and "interconnection" and the like, unless otherwise defined, may refer to two structures being in direct contact, or may refer to two structures not being in direct contact, with other structures being located between the two structures. Terms related to joining and connecting may also include situations where both structures are movable, or where both structures are fixed. In addition, the terms "electrically connected" and "coupled" include any direct and indirect means of electrical connection. In addition, terms such as "first" and "second" mentioned in this specification or claims are only used to name different elements or distinguish different embodiments or ranges, and are not used to limit the upper or lower limit on the number of elements, nor are they used to limit the manufacturing order or setting order of the elements.

[0023] The electronic device disclosed herein may include a display device, an antenna device, a sensing device, a light-emitting device, or a splicing device, but is not limited thereto. The electronic device may include a bendable or flexible electronic device. The electronic device may, for example, include a liquid crystal layer or a light emitting diode (LED). The light emitting diode may, for example, include 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 dot LED, which may include QLED, QDLED), fluorescence, phosphor or other suitable materials, or a combination thereof, but is not limited thereto. The following text will use a display device as an electronic device to illustrate the contents of the present disclosure, but the present disclosure is not limited thereto.

[0024] The display device of the present disclosure may be a non-self-luminous display device, such as a liquid crystal display device, but is not limited thereto. The following description will use a liquid crystal display device as a display device to illustrate the present disclosure, but the present disclosure is not limited thereto.

[0025] Figure 1 is a schematic cross-sectional view of an electronic device according to an embodiment of the present disclosure. Figure 2 yes Figure 1 Schematic top view of the backlight module. Figure 3A and Figure 3B They are first partial top views of different regions of the reflective layer on which a plurality of light conversion patterns are arranged. Figure 4A and Figure 4B They are second partial top views of different regions of the reflective layer on which a plurality of light conversion patterns are arranged. Figure 5A and Figure 5B They are third partial top views of different regions of the reflective layer on which a plurality of light conversion patterns are arranged. Figure 6A and Figure 6B They are fourth partial top views of different regions of the reflective layer on which a plurality of light conversion patterns are arranged. Figure 7A and Figure 7B They are fifth partial top views of different regions of the reflective layer on which a plurality of light conversion patterns are arranged. Figure 8 is a cross-sectional schematic diagram of an electronic device according to another embodiment of the present disclosure. Figure 9 yes Figure 8 A partially enlarged schematic diagram of the backlight module. Figure 10 FIG. 1 is a partial top view of a backlight module according to an embodiment of the present disclosure. Figure 11 is a schematic cross-sectional view of a light conversion pattern.

[0026] In the embodiments of this disclosure, identical or similar components will be referenced with identical or similar reference numerals, and redundant descriptions will be omitted. Furthermore, features from different embodiments may be arbitrarily disassembled, mixed, and used in combination, as long as they do not violate the spirit of the invention or conflict with each other. Simple equivalent variations and modifications made within the scope of this disclosure are also encompassed by the present invention.

[0027] Please refer to Figure 1 and Figure 2 The electronic device 1 may include a backlight module 10 and a display panel 12 disposed on the backlight module 10, but is not limited thereto. According to different requirements, the electronic device 1 may further include one or more components or film layers, which will not be described in detail herein.

[0028] The backlight module 10 has a main area A1 and a peripheral area A2 adjacent to the main area A1. Figure 2 As shown, the peripheral area A2 is adjacent to the main area A1 and may surround and connect to the main area A1, but this is not limited to this. In some embodiments, the maximum width of the peripheral area A2 in one direction may be 10% of the maximum width of the backlight module 10 in the same direction. For example, the maximum width W12 of the peripheral area A2 on one side (e.g., the left side) in the first direction D1 may be 10% of the maximum width W11 of the backlight module 10 in the first direction D1. Similarly, the maximum width W12 on the other side (e.g., the right side) may be 10% of the maximum width W11 of the backlight module 10 in the first direction D1. And / or the maximum width W22 of the peripheral area A2 on one side (e.g., the upper side) in the second direction D2 may be 10% of the maximum width W21 of the backlight module 10 in the second direction D2. Similarly, the maximum width W22 on the other side (e.g., the lower side) may be 10% of the maximum width W21 of the backlight module 10 in the second direction D2. The second direction D2 is different from the first direction D1. For example, the second direction D2 may be perpendicular to the first direction D1.

[0029] The backlight module 10 may include a light conversion layer 100, a plurality of light conversion patterns 101, and a plurality of light emitting units 102 ( Figure 1 Only one is shown schematically, but the present invention is not limited thereto. Depending on different requirements, the backlight module 10 may further include one or more components or layers. For example, the backlight module 10 may include a reflective layer 103, a light guide element 104, an optical film 105, an optical film 106, a circuit board 107, an adhesive layer 108, a back plate 109, and a plastic frame 110, but the present invention is not limited thereto.

[0030] When the backlight module 10 includes a frame 110, the maximum width W11 of the backlight module 10 in the first direction D1 refers to the maximum distance between two opposite outer edges of the frame 110 in the first direction D1; the maximum width W21 of the backlight module 10 in the second direction D2 refers to the maximum distance between two opposite outer edges of the frame 110 in the second direction D2. If the backlight module 10 does not include a frame 110, the maximum width W11 of the backlight module 10 in the first direction D1 refers to the maximum distance between two opposite outer edges of the backplate 109 in the first direction D1; the maximum width W21 of the backlight module 10 in the second direction D2 refers to the maximum distance between two opposite outer edges of the backplate 109 in the second direction D2.

[0031] It should be understood that the maximum width W12 and the maximum width W22 of the peripheral area A2 may be the same or different.

[0032] In some embodiments, the peripheral area A2 may include a first area A21 and a second area A22, wherein the first area A21 is located between the main area A1 and the second area A22. If the backlight module 10 includes a frame 110, the second area A22 may be defined by the frame 110. For example, the second area A22 may be substantially aligned with the area where the frame 110 is located when viewed in a normal direction to the backlight module 10 (e.g., a third direction D3 perpendicular to the first direction D1 and the second direction D2). If the backlight module 10 does not include a frame 110, the second area A22 may be substantially aligned with the area between the edge of the light conversion pattern 101 adjacent to the backplate 109 and the outer edge of the backplate 109 when viewed in the third direction D3.

[0033] The light conversion layer 100 may include a single layer or a multi-layer structure. In some embodiments, the light conversion layer 100 is disposed between the optical film 105 and the light guide element 104, but the present invention is not limited thereto. When the light conversion layer 100 is irradiated by a short wavelength light beam, it may convert at least a portion of the short wavelength light beam (such as blue light) into a long wavelength light beam (such as red light, green light, or yellow light, etc.), but the present invention is not limited thereto. In some embodiments, the material of the light conversion layer 100 may include fluorescence, phosphorescence, quantum dots (QD), other suitable materials, or a combination of at least two of the above, but the present invention is not limited thereto. In some embodiments, the light conversion layer 100 may be formed on a film and then fixed on the light guide element 104, or directly coated on the light guide element 104, or disposed between the light emitting element 102 and the light guide element 104, or disposed within the light guide element 104, but the present invention is not limited thereto.

[0034] The plurality of light conversion patterns 101 may be located in the peripheral area A2. In some embodiments, the plurality of light conversion patterns 101 are disposed on the reflective layer 103 and between the light guide element 104 and the reflective layer 103. In some embodiments, a portion of the light conversion patterns 101 may be located in the main area A1 adjacent to the peripheral area A2. For example, when the light conversion pattern 101 is illuminated by a short-wavelength light beam, it may convert at least a portion of the short-wavelength light beam (e.g., blue light) into a long-wavelength light beam (e.g., red light, green light, yellow light, or blue light having a longer wavelength than the incident light / incident light beam), but the present invention is not limited thereto. In some embodiments, the material of the plurality of light conversion patterns 101 may include fluorescent materials, phosphorescent materials, quantum dots, other suitable materials, or a combination of at least two of the foregoing, but the present invention is not limited thereto.

[0035] Multiple light-emitting units 102 are located in the peripheral area A2. Taking an edge-lit backlight module as an example, the multiple light-emitting units 102 may be disposed adjacent to the side S1 of the light guide element 104. In another embodiment, the multiple light-emitting units 102 may be disposed adjacent to the side S1 and side S1' on opposite sides of the light guide element 104, but this is not limited to the embodiment. The multiple light-emitting units 102 may be disposed on and electrically connected to the circuit board 107. The multiple light-emitting units 102 may include the aforementioned light-emitting diodes, which will not be repeated here.

[0036] The plurality of light-emitting units 102 can emit a light beam B. For example, the plurality of light-emitting units 102 can be a plurality of blue light-emitting diodes, and the light beam B is blue light. A portion of the light beam B (blue light) from the plurality of light-emitting units 102 can be converted into yellow light by the plurality of light-conversion patterns 101 or the light-conversion layer 100. The portion of the light beam B (blue light) not converted by the light-conversion patterns 101 or the light-conversion layer 100 can be mixed with the converted yellow light to form white light. Specifically, a portion of the light beam B from the plurality of light-emitting units 102 enters the light-guiding element 104 via the side surface S1 of the light-guiding element 104 and is transmitted from the peripheral area A2 toward the main area A1 within the light-guiding element 104 by total internal reflection. Microstructures (not shown) or dots (not shown) disposed on the bottom surface S2 of the light-guiding element 104 can disrupt total internal reflection, allowing a portion of the light beam B to be transmitted out of the light-guiding element 104 via the top surface S3 of the light-guiding element 104. A portion of the light beam B passing through the light guide element 104 can be converted into yellow light by the light conversion layer 100. The converted yellow light can be mixed with the portion of the blue light in the light beam B passing through the light guide element 104 to form white light. Meanwhile, another portion of the light beam B from the plurality of light-emitting units 102 (e.g., the high-angle light beam) does not enter the light guide element 104 and is transmitted to the plurality of light conversion patterns 101. Alternatively, another portion of the light beam B (e.g., the high-angle light beam) may enter the light guide element 104 from the side surface S1 and pass through the bottom surface S2 of the light guide element 104, where it is converted into yellow light by the plurality of light conversion patterns 101. The portion of the light beam B (blue light) not converted by the light conversion patterns 101 can be mixed with the converted yellow light to form white light.

[0037] The reflective layer 103 is disposed on the backplate 109 and between the bottom surface S2 of the light guide element 104 and the backplate 109. The reflective layer 103 can reflect the light beam B transmitted away from the display panel 12, thereby improving the light utilization efficiency of the backlight module 10. In some embodiments, the reflective layer 103 can include a white reflective sheet, white tape, or a metal reflective sheet. Alternatively, the reflective layer 103 can be disposed on the backplate 109 through a coating process, but is not limited thereto. In some embodiments, the reflective layer 103 can be further disposed between the side surface S1' of the light guide element 104 away from the light-emitting element 102 and the backplate 109 to improve the light utilization efficiency of the backlight module 10.

[0038] The light guide element 104 is disposed between the reflective layer 103 and the light conversion layer 100. In some embodiments, at least one of the bottom surface S2 and the top surface S3 of the light guide element 104 may be formed with a plurality of microstructures (not shown) or a plurality of dots (not shown). In some embodiments, the light guide element 104 may be made of, but is not limited to, plastic or glass.

[0039] The optical film 105 and the optical film 106 are disposed on the light conversion layer 100 and between the display panel 12 and the light conversion layer 100. In some embodiments, the optical film 105 and the optical film 106 may be a diffuser and a prism, respectively, but are not limited thereto. In other embodiments not shown, the backlight module 10 may include one or more diffusers, one or more prisms, and / or one or more other optical films, but are not limited thereto.

[0040] The circuit board 107 can be attached to the sidewall of the back plate 109 via the adhesive layer 108 so that the plurality of light emitting units 102 face the side surface S1 of the light guide element 104. In some embodiments, the circuit board 107 can include a printed circuit board, and the adhesive layer 108 can include tape or optical adhesive, but is not limited thereto.

[0041] The frame 110 may be disposed on the back plate 109 and support the display panel 12. A portion of the frame 110 may be disposed outside the sidewalls of the back plate 109, and a receiving space may be formed between the frame 110 and the back plate 109. The light guide element 104, the light conversion layer 100, the optical film 105, and the optical film 106 may be accommodated within the receiving space between the frame 110 and the back plate 109. In some embodiments, the frame 110 may be disposed on the back plate 109 and support the display panel 12, the optical film 105, and the optical film 106. A portion of the frame 110 may be disposed outside the sidewalls of the back plate 109, and a receiving space may be formed between the frame 110 and the back plate 109. The light guide element 104 and the light conversion layer 100 may be accommodated within the receiving space, and the optical film 105 and the optical film 106 may be disposed between the frame 110 and the display panel 12. In some embodiments, the plastic frame 110 may be made of a light-shielding material to shield the components thereunder.

[0042] In some embodiments, when the backlight module 10 does not include the plastic frame 110, the back plate 109 can support the display panel 12, and a receiving space can be formed between the display panel 12 and the back plate 109, and the light guide element 104, the light conversion layer 100, the optical film 105 and the optical film 106 can be accommodated in the receiving space.

[0043] The display panel 12 may be disposed above the optical film 106 via a plastic frame 110. In some embodiments, the display panel 12 may include a non-self-luminous display panel, such as a liquid crystal display panel, but is not limited thereto.

[0044] The light beam B may be converted into white light after passing through the light conversion layer 100 . The white light may pass through the optical film 105 and the optical film 106 in sequence and may be used as the light source of the display panel 12 .

[0045] The first partial beam P1 emitted from the main area A1 has at least one corresponding position (chromaticity point) in the CIE1931 color space. The second partial beam P2 emitted from the peripheral area A2 has at least one corresponding position (chromaticity point) in the CIE1931 color space. One of the at least one corresponding position of the first partial beam P1 of the light beam B has corresponding coordinates (x1, y1). One of the at least one corresponding position of the second partial beam P2 of the light beam B has corresponding coordinates (x2, y2), and the corresponding coordinates (x1, y1) and the corresponding coordinates (x2, y2) may satisfy the following relationship: 0 ≦ |x1-x2| ≦0.2. In some embodiments, the corresponding coordinates (x1, y1) and the corresponding coordinates (x2, y2) may further satisfy the following relationship: 0 ≦ |y1-y2| ≦0.3.

[0046] Specifically, the multiple light conversion patterns 101 arranged near one or more edges of the backlight module 10 can convert blue light into yellow light, and the blue light and yellow light are mixed to form white light. Therefore, the problem of white light color point shift in the peripheral area A2 can be improved, so that the white light performance of the main area A1 and the peripheral area A2 of the backlight module 10 tends to be consistent, thereby satisfying 0≦|x1-x2|≦0.2, or further satisfying 0≦|y1-y2|≦0.3.

[0047] In some embodiments, the corresponding coordinates (x1, y1) and the corresponding coordinates (x2, y2) may further satisfy the following relationship: 0≦|x1-x2|≦0.1 or 0≦|x1-x2|≦0.05. In some embodiments, the corresponding coordinates (x1, y1) and the corresponding coordinates (x2, y2) may further satisfy the following relationship: 0≦|y1-y2|≦0.15 or 0≦|y1-y2|≦0.05.

[0048] Table 1 below lists examples of three display panels of different sizes. However, it should be understood that Table 1 is illustrative only and does not limit the present disclosure. In Table 1, the corresponding coordinates (x1, y1) represent, for example, a chromaticity point located within the primary area of the backlight module, within a range of 12% to 15% from the edge of the backlight module. The corresponding coordinates (x2, y2) represent, for example, a chromaticity point located within the peripheral area of the backlight module, adjacent to the primary area. As can be seen from Table 1, multiple light conversion patterns help achieve a consistent white light appearance between the primary and peripheral areas of the backlight module.

[0049] Screen size 49 inches 55 inches 65 inches x1 0.260～0.270 0.260～0.272 0.260～0.275 y1 0.230～0.240 0.230～0.245 0.230～0.243 x2 0.270～0.296 0.272～0.293 0.270～0.280 y2 0.255～0.280 0.240～0.276 0.240～0.253 |x1-x2| 0.000～0.036 0.000～0.033 0.005～0.020 |y1-y2| 0.015～0.050 0.005～0.046 0.003～0.023

[0050] Table 1

[0051] In some embodiments, as Figures 3A to 6B As shown, from a top view, the shape of the light conversion pattern 101 can be close to a circle or an ellipse, but the present disclosure is not limited thereto. Figure 3A As shown, the plurality of light conversion patterns 101 may include a first light conversion pattern 101-1 and a second light conversion pattern 101-2, wherein the first light conversion pattern 101-1 is closer to the main area A1 than the second light conversion pattern 101-2. Figure 3AFor example, a plurality of light-emitting units (not shown) are arranged in a second direction D2. In a top view, a dotted line L1 perpendicular to the second direction D2 (e.g., parallel to the first direction D1) can be drawn from any point within the main area A1 toward the peripheral area A2. The light-converting pattern 101 closest to the main area A1 on this dotted line L1 is designated as the first light-converting pattern 101-1, while the light-converting pattern 101 farthest from the main area A1 on this dotted line L1 is designated as the second light-converting pattern 101-2. In a top view, the first light-converting pattern 101-1 and the second light-converting pattern 101-2 can have different widths. For example, the maximum width W101-1 of the first light-converting pattern 101-1 (the maximum width in the first direction D1) can be smaller than the maximum width W101-2 of the second light-converting pattern 101-2 (the maximum width in the first direction D1).

[0052] In some embodiments, as Figures 3A to 6B As shown, the maximum width of the light conversion patterns 101 near the peripheral area A2 can be greater than the maximum width of the light conversion patterns 101 near the main area A1, so that more blue light near the peripheral area A2 can be converted into yellow light to improve the white light color point shift problem.

[0053] In some embodiments, Figure 3A For example, in the top view, a dotted line L2 parallel to the second direction D2 is shown from any point in the main area A1 to the peripheral area A2. The light conversion patterns on the dotted line L2 may have substantially the same maximum width, but are not limited thereto.

[0054] In some embodiments, as Figures 3A to 6B As shown, the multiple light conversion patterns 101 can be staggered. That is, the angle between the arrangement direction of any light conversion pattern 101 and the most adjacent light conversion pattern 101 and the direction perpendicular to the arrangement direction of the multiple light emitting units (such as the first direction D1) is not equal to 0 degrees or 90 degrees. Figure 3A For example, the angle between the arrangement direction D4 (or arrangement direction D5 ) of the second light conversion pattern 101 - 2 and the light conversion pattern 101 - 3 (or the light conversion pattern 101 - 4 ) and the first direction D1 is not equal to 0 degree or 90 degrees.

[0055] By using a staggered arrangement of the light conversion patterns 101 , the probability of the light beam hitting the light conversion pattern 101 is increased, thereby increasing the probability of blue light being converted into yellow light and improving the problem of white light color point shift.

[0056] In some embodiments, the reflective layer 103 can be cut to facilitate assembly of the reflective layer 103 and the back plate 109. Figures 3A to 6BAs shown, the reflective layer 103 has an edge C. In some embodiments, the plurality of light conversion patterns 101 disposed on the reflective layer 103 may be cut to a size such as Figure 3A and Figure 3B In some embodiments, the plurality of light conversion patterns 101 disposed on the reflective layer 103 may not be cut, as shown in FIG. Figure 4A and Figure 4B In some embodiments, a plurality of light conversion patterns 101 may be provided on three edges of the reflective layer 103, and one edge of the reflective layer 103 may not be provided with a light conversion pattern, as shown in FIG. Figure 5A and Figure 5B 、 Figure 6A and Figure 6B In some embodiments, one or all of the plurality of light conversion patterns 101 may be strip-shaped, such as Figure 7A and Figure 7B shown.

[0057] Please refer to Figure 8 and Figure 9 The electronic device 1A may include a backlight module 10A and a display panel 12. The backlight module 10A and the display panel 12 Figure 1 The main difference between the backlight module 10 and the backlight module 10A is that the backlight module 10A is a direct-lit backlight module. Specifically, the backlight module 10A may include a light conversion layer 100, a plurality of light conversion patterns 101, a plurality of light-emitting units 102, a reflective layer 103, an optical film 105, an optical film 106, a back plate 109, a plastic frame 110, and an optical film 111, but is not limited thereto.

[0058] In the backlight module 10A, multiple light-emitting units 102 may be disposed on a reflective layer 103. The reflective layer 103 may be formed from, but is not limited to, the top metal layer of a circuit board or a reflective coating (such as white paint). In some embodiments, the reflective layer 103 may further extend onto the sidewalls of the backplate 109, and multiple light-converting patterns 101 may be disposed on the reflective layer 103 corresponding to the sidewalls of the backplate 109. In one embodiment, the multiple light-converting patterns 101 may be arranged in a matrix. In another embodiment, the multiple light-converting patterns 101 may be arranged in a staggered pattern, but this is not a limitation.

[0059] The multiple light conversion patterns 101 disposed adjacent to one or more edges of the backlight module 10A can convert a portion of the blue light into yellow light. The unconverted blue light can be mixed with the yellow light to form white light. This can improve the problem of white light color point shift in the peripheral area A2, making the white light performance of the main area A1 and the peripheral area A2 of the backlight module 10A closer to the same, thereby satisfying 0≦|x1-x2|≦0.2, or further satisfying 0≦|y1-y2|≦0.3.

[0060] In some embodiments, the plurality of light conversion patterns 101 may have the same size (eg, width), but is not limited thereto.

[0061] Please refer to Figure 10 In some embodiments, such as in the architecture of an edge-lit backlight module, the gap G between two adjacent light conversion patterns 101 may be greater than 0 and less than or equal to half of the distance D between two adjacent light conversion patterns 101 in the plurality of light conversion patterns 101 in the row closest to the plurality of light conversion patterns 102 in the arrangement direction of the plurality of light conversion patterns 102 (e.g., the first direction D1). The distance D refers to the distance between one side of two adjacent light conversion patterns 101 in the first direction D1 and the same side (e.g., Figure 10 As shown, the minimum distance is from the left to the left, or from the right to the right, or from the middle to the middle) of adjacent light emitting units 102.

[0062] The above design can improve the conversion of the light beam B emitted by the light emitting unit 102 into yellow light, improve the white light performance between two adjacent light emitting units 102 and the area in front of the light emitting unit 102, or improve the uneven brightness problem of the backlight module 10.

[0063] Table 2 below lists four screen size examples, but it should be understood that Table 2 is only for illustration and does not limit the present disclosure. In Table 2, the gap G is 0, which means that the light conversion pattern adopts the following Figure 7A and Figure 7B The stripe pattern design shown. For example, the stripe-shaped light conversion pattern can be disposed on the edge of the reflective layer adjacent to the light incident side, but is not limited thereto. In other embodiments, the stripe-shaped light conversion pattern can also be disposed on multiple (e.g., two, three, or four) edges of the reflective layer.

[0064] Screen size 27 inches 49 inches 55 inches 65 inches Gap G(mm) 0 2.6 2.6 3.8

[0065] Table 2

[0066] Please refer to Figure 11 In some embodiments, the cross-sectional shape of the light conversion pattern 101 may be substantially semi-elliptical and have an arc-shaped surface, but is not limited thereto. For example, the light conversion pattern 101 may be formed on the reflective layer (not shown) by printing, spraying, etc. Figure 11). From a cross-sectional view of the light conversion pattern 101, the maximum thickness TH of the light conversion pattern 101 in the third direction D3 is, for example, less than or equal to the bottom width WB of the light conversion pattern 101 (e.g., the maximum width in the first direction D1). This design allows the light pattern generated by the light conversion pattern 101 to be more uniform. If the maximum thickness TH is greater than the bottom width WB, the light pattern generated by the light conversion pattern 101 will be more concentrated, potentially causing chromatic aberration in the backlight module. In some embodiments, TH / WB can fall within the range of 0.01 to 1.0, i.e., 0.01≦TH / WB≦1.0.

[0067] Table 3 below lists two examples of screen sizes. However, it should be understood that Table 3 is illustrative only and does not limit the present disclosure. In Table 3, the dimensions of the light conversion patterns (e.g., bottom width) increase from the primary area to the peripheral area. Specifically, the bottom width of the third light conversion pattern is greater than that of the second light conversion pattern, and the bottom width of the second light conversion pattern is greater than that of the first light conversion pattern. When TH / WB < 0.1, the maximum thickness TH of the light conversion pattern is too small, which may increase the probability of blue light leakage in the edge area and easily cause color shading. When TH / WB > 1, the maximum thickness TH of the light conversion pattern is too large, meaning that the light pattern generated by the light conversion pattern is more concentrated rather than divergent. Furthermore, in a small, thin backlight module architecture, the light guide element may bend due to the thicker light conversion pattern, resulting in uneven brightness in the backlight module.

[0068]

[0069] Table 3

[0070] In summary, in the embodiments disclosed herein, multiple light conversion patterns disposed adjacent to one or more edges of the backlight module convert a portion of blue light into yellow light. The unconverted blue light can then be mixed with the yellow light to form white light, thereby improving the problem of white light color point shift in peripheral areas and ensuring that the white light performance of the main and peripheral areas of the backlight module is consistent. In some embodiments, the width of the multiple light conversion patterns adjacent to the peripheral area can be greater than the width of the multiple light conversion patterns adjacent to the main area, allowing more blue light in the adjacent peripheral areas to be converted into yellow light, thereby improving the problem of white light color point shift. In some embodiments, the multiple light conversion patterns can be staggered to increase the probability of the light beam contacting the light conversion patterns during travel, thereby increasing the probability of blue light being converted into yellow light, thereby improving the problem of white light color point shift. In some embodiments, the gaps between the multiple light conversion patterns can be designed to improve the white light performance between adjacent light-emitting units and in front of the light-emitting units, or to improve the problem of uneven brightness of the backlight module 10. In some embodiments, the cross-sectional shape of the light conversion patterns can be designed to improve the chromatic aberration effect.

[0071] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

[0072] Although the embodiments and advantages of the present disclosure have been disclosed above, it should be understood that any person skilled in the art may make changes, substitutions and modifications without departing from the spirit and scope of the present disclosure, and the features between the embodiments may be arbitrarily mixed and replaced with each other to form other new embodiments. In addition, the scope of protection of the present disclosure is not limited to the processes, machines, manufacturing, material compositions, devices, methods and steps in the specific embodiments described in the specification. Any person skilled in the art can understand from the content of the present disclosure that the processes, machines, manufacturing, material compositions, devices, methods and steps currently or in the future developed can be used according to the present disclosure as long as they can implement substantially the same functions or obtain substantially the same results in the embodiments described herein. Therefore, the scope of protection of the present disclosure includes the above-mentioned processes, machines, manufacturing, material compositions, devices, methods and steps. In addition, each claim constitutes a separate embodiment, and the scope of protection of the present disclosure also includes the combination of each claim and embodiment. The scope of protection of the present disclosure shall be determined by the appended claims.

Claims

1. A backlight module, characterized in that: The backlight module has a main area and a peripheral area adjacent to the main area, and the backlight module includes: light conversion layer; a plurality of light conversion patterns located in the peripheral area; and a plurality of light-emitting units emitting light beams, wherein a first portion of the light beams emitted from the main area has at least one corresponding position in a CIE 1931 color space, and a second portion of the light beams emitted from the peripheral area has at least one corresponding position in the CIE 1931 color space; wherein one of the at least one corresponding position of the first portion of the light beam has corresponding coordinates (x1, y1), one of the at least one corresponding position of the second portion of the light beam has corresponding coordinates (x2, y2), and the corresponding coordinates (x1, y1) and the corresponding coordinates (x2, y2) satisfy the following relationship: 0≦|x1-x2|≦0.

2.

2. The backlight module according to claim 1, wherein: The corresponding coordinates (x1, y1) and the corresponding coordinates (x2, y2) also satisfy the following relationship: 0≦|y1-y2|≦0.

3.

3. The backlight module according to claim 1, wherein: A gap between two adjacent ones of the plurality of light conversion patterns is greater than 0 and is less than or equal to half of a distance between two adjacent ones of the plurality of light emitting units.

4. The backlight module according to claim 1, wherein: The plurality of light conversion patterns include a first light conversion pattern and a second light conversion pattern. The first light conversion pattern is closer to the main area than the second light conversion pattern. In a plan view, the first light conversion pattern and the second light conversion pattern have different widths.

5. The backlight module according to claim 4, wherein: The width of the first light conversion pattern is smaller than the width of the second light conversion pattern.

6. The backlight module according to claim 1, wherein: The plurality of light conversion patterns are arranged in a staggered manner.

7. The backlight module according to claim 1, wherein: Also includes: A reflective layer, wherein the plurality of light conversion patterns are disposed on the reflective layer.

8. The backlight module according to claim 7, wherein: Also includes: The light guide element is arranged between the reflective layer and the light conversion layer.

9. The backlight module according to claim 1, wherein: One of the plurality of light conversion patterns is stripe-shaped.

10. An electronic device, characterized in that: include: The backlight module according to claim 1.

11. The electronic device according to claim 10, wherein: Also includes: The display panel is arranged on the backlight module.

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