Electronic device

Abstract

The invention provides an electronic device. The electronic device comprises a reflective panel; the light guide plate is arranged on the reflective panel, the light guide plate is provided with a first surface, a second surface and a side surface, and the first surface is adjacent to the reflective panel; and a light source adjacent the side surface; wherein the second surface comprises a plurality of concave structures, in the normal direction of the reflective panel, one of the plurality of concave structures has a depth, the side surface has a thickness, and the ratio of the depth to the thickness is greater than or equal to 0.0001 and less than or equal to 0.25; after light emitted by the light source passes through the light guide plate, a first light pattern graph is obtained through measurement of the first surface, a second light pattern graph is obtained through measurement of the second surface, and the maximum ratio of the brightness of the first light pattern graph to the brightness of the second light pattern graph is located at the view angle larger than or equal to 0 degree and smaller than or equal to 40 degrees.

Description

Technical Field

[0001] The present disclosure relates to an electronic device, and in particular to an electronic device with a specially designed light guide plate. Background Art

[0002] Reflective electronic (display) devices have been gradually widely used in daily life because they can omit the backlight source and, if a bistable cholesterol liquid crystal panel is used, the power consumption can be greatly reduced, which is beneficial to environmental protection.

[0003] However, current reflective display devices still have disadvantages such as poor light extraction efficiency or glare. Therefore, there is still a need to develop an electronic device to improve the existing defects. Summary of the invention

[0004] The present disclosure provides an electronic device, characterized in that it includes: a reflective panel; a light guide plate, which is arranged on the reflective panel, the light guide plate has a first surface and a second surface opposite to each other and a side surface connected between the first surface and the second surface, wherein the first surface is adjacent to the reflective panel; and a light source, which is adjacent to the side surface; wherein the second surface includes a plurality of recessed structures, one of the plurality of recessed structures has a depth in the normal direction of the reflective panel, the side surface has a thickness, and the ratio of the depth to the thickness is greater than or equal to 0.0001 and less than or equal to 0.25; wherein, after the light emitted by the light source passes through the light guide plate, a first light pattern is measured by the first surface to obtain a first light pattern, and a second light pattern is measured by the second surface to obtain a second light pattern, and the maximum ratio of the brightness of the first light pattern to the brightness of the second light pattern is located at a viewing angle greater than or equal to 0° and less than or equal to 40°.

[0005] The present disclosure further provides an electronic device, characterized in that it includes: a reflective panel; a light guide plate, which is arranged on the reflective panel, the light guide plate having a first surface and a second surface opposite to each other and a side surface connected between the first surface and the second surface, wherein the first surface is adjacent to the reflective panel; and a light source, which is adjacent to the side surface; wherein the second surface includes a plurality of recessed structures, one of the plurality of recessed structures has a depth in the normal direction of the reflective panel, the side surface has a thickness, and the ratio of the depth to the thickness is greater than or equal to 0.0001 and less than or equal to 0.25; wherein, after the light emitted by the light source passes through the light guide plate, a first light pattern is measured by the first surface, and the ratio of the brightness at a viewing angle of 0° to the maximum brightness in the first light pattern is between 0.05 and 0.4. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1FIG. 4 is a schematic diagram of a portion of an electronic device according to an embodiment of the present disclosure.

[0007] Figure 2A 1 is a light pattern measured from the first surface of the light guide plate according to an embodiment of the present disclosure.

[0008] Figure 2B 1 is a light pattern measured from the second surface of the light guide plate according to an embodiment of the present disclosure.

[0009] Figure 3 Schematic diagram of a light guide plate according to an embodiment of the present disclosure.

[0010] Figure 3A and Figure 3B They are Figure 3 A partial enlarged view of .

[0011] Figure 4 FIG. 4 is a schematic diagram of a portion of an electronic device according to an embodiment of the present disclosure.

[0012] Figure 5 FIG. 4 is a schematic diagram of a portion of an electronic device according to an embodiment of the present disclosure.

[0013] Figure 6 FIG. 4 is a schematic diagram of an electronic device according to an embodiment of the present disclosure.

[0014] Figure 7 FIG. 4 is a schematic diagram of an electronic device according to an embodiment of the present disclosure.

[0015] In the above drawings, the meanings of the reference numerals are as follows:

[0016] 1 Reflective panel

[0017] 11. First Panel

[0018] 12 Second Panel

[0019] 13 Third Panel

[0020] 2 Light guide plate

[0021] 2a First surface

[0022] 2b Second surface

[0023] 2b1 Flat surface

[0024] 2c, 2d side surface

[0025] 21 Concave structure

[0026] 21s Concave surface

[0027] 21s1 first side

[0028] 21s2 Side 2

[0029] 3 Light Source

[0030] 4, 5, 7, 10 attachments

[0031] 6 Touch layer

[0032] 8 Covering substrate

[0033] 9 Anti-reflection layer

[0034] ES Extended Surface

[0035] P1 Part 1

[0036] P2 Part 2

[0037] P3 Part 3

[0038] VS Virtual Face

[0039] D Depth

[0040] H, H1, H2 thickness

[0041] G1 First spacing

[0042] G2 Second spacing

[0043] G3 Third spacing

[0044] G4 Fourth spacing

[0045] L1 First Length

[0046] L2 Second length

[0047] W, W' width

[0048] θ1 First angle

[0049] θ2 Second angle

[0050] θ3 The third angle

[0051] θ4 Fourth angle

[0052] X first direction

[0053] Y Second direction

[0054] Z Normal Direction DETAILED DESCRIPTION

[0055] The following is an explanation of the implementation of the present disclosure through specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways according to different viewpoints and applications without departing from the spirit of the present invention.

[0056] It should be noted that, in this document, unless otherwise specified, "having an element" is not limited to having a single element, but may have one or more elements. In addition, the ordinal numbers used in the specification and claims, such as "first" and "second", to modify the elements of the claims, do not themselves imply or represent any previous ordinal numbers of the claimed elements, nor do they represent the order of one claimed element and another claimed element, or the order of the manufacturing method. The use of these ordinals is only used to make a claimed element with a certain name clearly distinguishable from another claimed element with the same name.

[0057] Certain words are used throughout the specification and the claims that follow to refer to specific components. It will be understood by those skilled in the art that electronic equipment manufacturers may refer to the same components by different names. It is not intended herein to distinguish between components that have the same function but different names. In the following specification and claims, words such as "include", "contain", "have" are open-ended words, and therefore should be interpreted as "including but not limited to..." Therefore, when the terms "include", "contain" and / or "have" are used in the description of the present disclosure, they specify the presence of corresponding features, regions, steps, operations and / or components, but do not exclude the presence of one or more corresponding features, regions, steps, operations and / or components.

[0058] In the text, the terms "about", "approximately", "substantially", and "roughly" generally mean within 10%, within 5%, within 3%, within 2%, within 1%, or within 0.5% of a given value or range. The numbers given here are approximate numbers, that is, in the absence of specific instructions for "about", "approximately", "substantially", and "roughly", the meanings of "about", "approximately", "substantially", and "roughly" can still be implied. In addition, the terms "range from a first value to a second value" and "range between a first value and a second value" mean that the range includes the first value, the second value, and other values ​​therebetween.

[0059] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by ordinary technicians to whom this disclosure belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with the background or context of the relevant technology and the present disclosure, and should not be interpreted in an idealized or overly formal manner unless specifically defined herein.

[0060] In addition, relative terms such as "below" or "bottom" and "above" or "top" may be used in the embodiments to describe the relative relationship of one element of the diagram to another element. It is understood that if the device of the diagram is turned upside down, the element described on the "below" side will become the element on the "above" side. When a corresponding component (such as a film layer or region) is referred to as "on another component", it can be directly on the other component, or there can be other components between the two. On the other hand, when a component is referred to as "directly on another component", there is no component between the two. In addition, when a component is referred to as "on another component", the two have an up-and-down relationship in the top-view direction, and this component can be above or below the other component, and this up-and-down relationship depends on the orientation of the device.

[0061] In the present disclosure, the distance, width, length, thickness and depth can be measured by an optical microscope, and the distance, width, length, thickness and depth can be measured by a cross-sectional image in an electron microscope, but the present disclosure is not limited thereto. In addition, any two values ​​or directions used for comparison may have a certain error. If the first value is equal to the second value, it implies that there may be an error of about 10% between the first value and the second value; 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.

[0062] It should be noted that the technical solutions provided in the following different embodiments can be replaced, combined or mixed with each other to form another embodiment without violating the spirit of the present disclosure.

[0063] The electronic device disclosed in the present invention may include, for example, a display device, a sensing device, an antenna device, a touch device, a splicing device or other suitable electronic devices, but is not limited thereto. The display device disclosed in the present invention may be a non-self-luminous display device or a self-luminous display device, such as a liquid crystal display (Liquid Crystal Display), a cholesterol liquid crystal display (Cholesteric Liquid Crystal Display), an electrophoretic display (Electro-Phoretic Display), an organic light emitting diode display (organic light emitting diode Display), and a light emitting diode display (light emitting diode Display), but is not limited thereto. The display device may include a light emitting diode, a light conversion layer or other suitable materials, or a combination thereof, but is not limited thereto. The light emitting diode may include, for example, an organic light emitting diode (organic light emitting diode, OLED), a sub-millimeter light emitting diode (mini LED), a micro light emitting diode (micro LED) or a quantum dot light emitting diode (quantum dot LED, which may include QLED, QDLED), but is not limited thereto. The light conversion layer may include a wavelength conversion material and / or a filter material, and the light conversion layer may include, for example, fluorescence, phosphor, quantum dot (QD), other suitable materials or a combination of the above, but not limited thereto. The sensing device may include, for example, a biosensor, a touch sensor, a fingerprint sensor, other suitable sensors or a combination of the above types of sensors. The antenna device may be, for example, a liquid crystal antenna or other types of antenna types, but not limited thereto. The splicing device may include, for example, a splicing display device or a splicing antenna device, but not limited thereto. The electronic device may include an electronic component, and the electronic component may include a passive component, an active component or a combination of the above, such as a capacitor, a resistor, an inductor, a varactor diode, a variable capacitor, a filter, a diode, a transistor, a sensor, a micro-electromechanical system component (MEMS), a chip, etc., but not limited thereto. It should be noted that the electronic device of the present disclosure may be various combinations of the above devices, but not limited thereto.

[0064] Figure 1 FIG. 4 is a schematic diagram of a portion of an electronic device according to an embodiment of the present disclosure.

[0065] In one embodiment of the present disclosure, Figure 1As shown, the electronic device may include: a reflective panel 1; a light guide plate 2, which is disposed on the reflective panel 1, the light guide plate 2 having a first surface 2a and a second surface 2b opposite to each other and a side surface 2c connected between the first surface 2a and the second surface 2b, wherein the first surface 2a is adjacent to the reflective panel 1; and a light source 3, which is adjacent to the side surface 2c. The second surface 2b includes a plurality of recessed structures 21, one of the recessed structures 21 has a depth D in the normal direction Z of the reflective panel 1, and the side surface 2c has a thickness H, and the ratio of the depth D to the thickness H is greater than or equal to 0.0001 and less than or equal to 0.25, but is not limited thereto. In some embodiments, the ratio of the depth D to the thickness H is greater than or equal to 0.001 and less than or equal to 0.1. In some embodiments, the ratio of the depth D to the thickness H is greater than or equal to 0.002 and less than or equal to 0.05. In some embodiments, the ratio of the depth D to the thickness H is greater than or equal to 0.003 and less than or equal to 0.02. Through the above design, the light guiding efficiency of the light guide plate 2 (for example, the light guiding efficiency of guiding light to the reflective panel 1) can be improved.

[0066] In one embodiment of the present disclosure, Figure 1 As shown, the reflective panel 1 may include a first panel 11, a second panel 12 and a third panel 13, wherein the second panel 12 is disposed between the first panel 11 and the third panel 13, wherein the first panel 11, the second panel 12 and the third panel 13 may selectively reflect light of different colors, respectively, and the cholesterol liquid crystal layers in the first panel 11, the second panel 12 and the third panel 13 may be used to reflect light of different colors, respectively, for example, in a planer state. For example, the cholesterol liquid crystal layer in the first panel 11 may reflect blue light in a planer state, the cholesterol liquid crystal layer in the second panel 12 may reflect green light in a planer state, and the cholesterol liquid crystal layer in the third panel 13 may reflect red light in a planer state, but the present disclosure is not limited thereto.

[0067] In the present disclosure, the material of the light guide plate 2 includes glass, polycarbonate (PC), polymethylmethacrylate (PMMA), polyethyleneterephthalate (PET), a suitable high light transmittance material or a combination thereof, but the present disclosure is not limited thereto. In one embodiment, the thickness H of the light guide plate 2 (the thickness H of the side surface 2c) may be between 120 μm and 5000 μm (120 μm≦H≦5000 μm), for example, between 200 μm and 4000 μm (200 μm≦H≦4000 μm), between 300 μm and 3000 μm (300 μm≦H≦3000 μm), or between 400 μm and 2000 μm (400 μm≦H≦2000 μm), but the present disclosure is not limited thereto.

[0068] In one embodiment of the present disclosure, Figure 1 As shown, the recessed structure 21 has a recessed surface 21s, and the recessed surface 21s is connected to a flat surface 2b1 of the second surface 2b. In the cross-section of the light guide plate 2, the recessed surface 21s includes a first surface 21s1 (for example, a surface adjacent to the light source) and a second surface 21s2 (for example, a surface facing away from the light source), and the angle between the first surface 21s1 and a virtual surface VS perpendicular to the flat surface 2b1 is a first angle θ1, and the angle between the second surface 21s2 and the virtual surface VS is a second angle θ2, wherein the first angle θ1 is greater than the second angle θ2. Through the above design, the light guiding efficiency of the light guide plate 2 can be improved. In one embodiment of the present disclosure, as Figure 1 As shown, the angle between the first surface 21s1 and an extended surface ES of the flat surface 2b1 is a third angle θ3, and the angle between the second surface 21s2 and the extended surface ES is a fourth angle θ4, wherein the third angle θ3 is smaller than the fourth angle θ4. The above design can improve the efficiency of the light guide plate 2 in guiding light downward to the reflective panel 1. In one embodiment of the present disclosure, Figure 1 As shown, the flat surface 2b1 may be substantially perpendicular to the normal direction Z of the light guide plate 2, but is not limited thereto.

[0069] In the present disclosure, when viewed from above the light guide plate 2, the shape of the recessed structure 21 may include, for example, a circular, elliptical, half-moon, rectangular, rhombus, polygonal, irregular or other suitable shapes, but the present disclosure is not limited thereto. In one embodiment of the present disclosure, the depth D of the recessed structure 21 may be between 0.5 μm and 30 μm (0.5 μm≦D≦30 μm), for example, between 1 μm and 25 μm (1 μm≦D≦25 μm), between 1.5 μm and 20 μm (1.5 μm≦D≦20 μm) or between 2 μm and 10 μm (2 μm≦D≦10 μm), but is not limited thereto. In the present disclosure, the “depth of the recessed structure” refers, for example, to the maximum distance between the recessed structure 21 and the extension surface ES of the flat surface 2b1 of the second surface 2b in the normal direction Z of the light guide plate 2. In one embodiment of the present disclosure, the ratio of the depth D of the recessed structure 21 to the thickness H of the side surface 2c may be between 0.0001 and 0.25 (0.0001≦D / H≦0.25), for example, between 0.00025 and 0.125 (0.00025≦D / H≦0.125), between 0.0005 and 0.0667 (0.0005≦D / H≦0.0667), or between 0.0008 and 0.05 (0.0008≦D / H≦0.05), but the present disclosure is not limited thereto. When the ratio of the depth D of the recessed structure 21 to the thickness H of the side surface 2c meets the above design, the light guiding efficiency of the light guide plate 2 may be improved.

[0070] In one embodiment of the present disclosure, the width W of the recessed structure 21 may be between 5 μm and 150 μm (5 μm≦W≦150 μm), for example, between 8 μm and 120 μm (8 μm≦W≦120 μm), between 10 μm and 100 μm (10 μm≦W≦100 μm), or between 15 μm and 80 μm (15 μm≦W≦80 μm), but the present disclosure is not limited thereto. The “width of the recessed structure” refers, for example, to the distance between adjacent flat surfaces 2 b 1 on the cross section of the light guide plate 2; or, for example, to the maximum width of the recessed structure in the first direction X. In one embodiment of the present disclosure, the ratio of the depth D of the recessed structure 21 to the width W of the recessed structure 21 may be between 0.003 and 6 (0.003≦D / W≦6), for example, between 0.008 and 3.125 (i.e., 0.008≦D / W≦3.125), between 0.015 and 2 (0.015≦D / W≦2), between 0.025 and 1.5 (i.e., 0.025≦D / W≦1.5), or between 0.03 and 1 (i.e., 0.03≦D / W≦1), but the present disclosure is not limited thereto. In one embodiment of the present disclosure, if Figure 1As shown, the first surface 21s1 has a first length L1, and the second surface 21s2 has a second length L2. The ratio of the first length L1 to the second length L2 can be greater than 1 and less than or equal to 8 (1 < L1 / L2 ≤ 8), greater than 1 and less than or equal to 6 (1 < L1 / L2 ≤ 6), or greater than 1 and less than or equal to 4 (1 < L1 / L2 ≤ 4), but the present disclosure is not limited thereto. When the design of the recessed structure 21 meets one or more of the above conditions, the light guiding efficiency of the light guide plate 2 can be improved. The "first / second length" refers to, for example, the distance from one end of the adjacent flat surface 2b1 to the end point farthest from the flat surface 2b1 on the cross-section of the light guide plate 2. In some embodiments, the first surface 21s1 or the second surface 21s2 may be an arc surface, but the present disclosure is not limited thereto.

[0071] In the present disclosure, the light source 3 may include a light emitting diode (LED). The light emitting diode may include, for example, an organic light emitting diode (OLED), a mini light emitting diode (mini LED), a micro light emitting diode (micro LED), or a quantum dot light emitting diode (quantum dot LED, which may include QLED, QDLED), fluorescence, phosphor, other suitable materials, or a combination of the above, but the present disclosure is not limited thereto.

[0072] In one embodiment of the present disclosure, the electronic device may include an attachment 4, which is disposed on the light guide plate 2. The material of the attachment 4 may include polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), optical clear adhesive (OCA), optical clear resin (OCR), other suitable materials or a combination of the foregoing, but the present disclosure is not limited thereto. In the present disclosure, the refractive index (n) of the attachment 4 may be between 1 and 1.4 (1≦n≦1.4) or between 1 and 1.35 (1≦n≦1.35), but is not limited thereto. The following is a measurement of the light pattern of the first surface 2a and the second surface 2b of the light guide plate 2 with a recessed structure 21 designed at different angles (e.g., the first angle θ1 and the second angle θ2) of an embodiment of the present case, to explore the light guiding effect of the light guide plate 2. In addition, the measurement positions of the light pattern are approximately the center positions of the first surface 2a and the second surface 2b, respectively. The light pattern diagram can be obtained by an angle analyzer (such as model DMS-803, but not limited thereto), an imaging spectrocolorimeter (such as Conometer) or other machines with similar functions, but not limited thereto. In one embodiment, when measuring the first surface 2a or the second surface 2b of the light guide plate 2, there may be an attachment (such as optical glue) or no attachment thereon, so the attachment has little effect on the light pattern diagram. The light pattern diagram may have an azimuth angle ψ and an inclination angle θ. The azimuth angle ψ has a range of 0 degrees to 360 degrees. The azimuth angle ψ is, for example, an angle corresponding to different directions on the plane of the first surface 2a or the second surface 2b of the light guide plate 2. For example, the azimuth angle ψ can be defined as 270 degrees near the light source 3, and the azimuth angle ψ can be defined as 90 degrees away from the light source 3. The inclination angle θ is defined as the inclination angle between the first surface 2a or the second surface 2b, and an inclination angle θ of 0 degrees represents a direction parallel to the normal of the first surface 2a or the second surface 2b, while an inclination angle θ of 90 degrees represents a direction parallel to the first surface 2a or the second surface 2b, and so on.

[0073] In one embodiment of the present disclosure, a light pattern measurement is performed on the first surface 2a of the light guide plate 2 having a recessed structure 21 designed with different angles (e.g., a first angle θ1 and a second angle θ2), and L% is calculated using formula (1) to obtain the brightness ratio (L%) of each angle combination, as shown in Table 1.

[0074] Formula (1): L% = L / L max

[0075] Where, L is the brightness value measured at a viewing angle (θ) of 0°; L max It is the maximum brightness value measured at a viewing angle (θ) between 0° and 60°.

[0076] Table 1: Brightness ratio (L%)

[0077]

[0078] When L% is greater than 40%, it means that the electronic device is prone to glare at a normal viewing angle; when L% is less than 5%, it means that the brightness of the electronic device at a normal viewing angle is too dim. Therefore, after the light emitted by the light source 3 passes through the light guide plate 2, the first light pattern is measured by the first surface 2a to obtain a first light pattern. In the first light pattern, the ratio of the brightness at a viewing angle of 0° (i.e., θ=0°) to the maximum brightness is between 0.05 and 0.4, that is, when L% is between 5% and 40% (5%≦L%≦40%), the corresponding design of the recessed structure 21 can enable the light guide plate 2 to have a preferred light guiding effect (the effect of guiding light to the reflective panel 1). In addition to maintaining an appropriate brightness at a normal viewing angle, the glare can also be improved or reduced.

[0079] In one embodiment of the present disclosure, light pattern measurements are performed on the first surface 2a and the second surface 2b of the light guide plate 2 having a recessed structure 21 designed with different angles (e.g., a first angle θ1 and a second angle θ2), and the viewing angle (θ) range corresponding to the maximum ratio of (brightness at the center point of the first surface 2a / brightness at the center point of the second surface 2b) is calculated to obtain the results of each angle combination, as shown in Table 2.

[0080] Table 2: Viewing angle (θ)

[0081]

[0082] When the viewing angle (θ) corresponding to the maximum ratio of (brightness of the center point of the first surface 2a / brightness of the center point of the second surface 2b) is between 0° and 40°, it means that the electronic device has a preferred luminous efficiency under a general viewing angle (viewing angle (θ) is between 0° and 40°). Therefore, when the light emitted by the light source 3 passes through the light guide plate 2, a first light pattern is measured by the first surface 2a, and a second light pattern is measured by the second surface 2b. The maximum ratio of the brightness of the first light pattern to the brightness of the second light pattern is located at a viewing angle (θ) greater than or equal to 0° and less than or equal to 40°. That is, when the viewing angle (θ) corresponding to the maximum ratio of (brightness of the center point of the first surface 2a / brightness of the center point of the second surface 2b) is between 0° and 40°, the design of the corresponding recessed structure 21 can enable the light guide plate 2 to have a preferred light guiding effect. Since the light emitted from the second surface 2b is not used to provide light for reflection to the reflective panel 1, and the light emitted from the first surface 2a is used to provide light for reflection to the reflective panel 1, the maximum ratio of the brightness of the center point of the first surface 2a / the brightness of the center point of the second surface 2b) is designed to be between the viewing angle (θ) of 0° to 40°, which can have a preferred light-guiding effect to ensure a higher brightness at a viewing angle (θ) of 0° to 40°. In other words, by designing the first angle θ1 and the second angle θ2 of the recessed structure 21, the viewing angle (θ) corresponding to the maximum ratio of (the brightness of the center point of the first surface 2a / the brightness of the center point of the second surface 2b) can be between 0° and 40°. This design of the light guide plate 2 can have a preferred light-guiding effect to ensure a higher brightness at a viewing angle (θ) of 0° to 40°.

[0083] In one embodiment of the present disclosure, light patterns of the first surface 2a and the second surface 2b of the light guide plate 2 having a recessed structure 21 designed with different angles (e.g., a first angle θ1 and a second angle θ2) are measured respectively, and the brightness ratio of the first surface 2a to the second surface 2b is calculated using formula (2) to obtain the brightness ratio of each angle combination, as shown in Table 3.

[0084] Formula (2): Brightness ratio = L 2a / L 2b

[0085] Among them, L 2a is the average brightness value measured from the first surface 2a at a viewing angle (θ) between 10° and 30°; L 2b The average brightness value measured by the second surface 2b when the viewing angle (θ) is between 10° and 30°. The “average brightness value” is, for example, the brightness values ​​at viewing angles of 10°, 20° and 30° are measured respectively, and the average of the three values ​​is taken.

[0086] Table 3: Brightness ratio

[0087]

[0088]

[0089] Since the light emitted from the second surface 2b is not used to provide light for reflection to the reflective panel 1, and the light emitted from the first surface 2a is used to provide light for reflection to the reflective panel 1, the greater the ratio of the brightness of the first surface 2a to the second surface 2b, the more light the light guide plate 2 can provide to the reflective panel 1. In this way, the light guide efficiency of the light guide plate 2 can be improved, and a higher brightness can be achieved at a viewing angle (θ) between 10° and 30°. Therefore, when the light emitted by the light source 3 passes through the light guide plate 2, a first light pattern is measured from the first surface 2a, and a second light pattern is measured from the second surface 2b. At a viewing angle between 10° and 30°, the ratio of the brightness of the first light pattern to the brightness of the second light pattern is greater than or equal to 5, and the corresponding design of the recessed structure 21 can enable the light guide plate 2 to have a preferred light guide effect. In other words, by combining the first angle θ1 and the second angle θ2 of the recessed structure 21, the brightness ratio of the first surface 2a to the second surface 2b can be made greater than or equal to 5. At this time, the light guide plate 2 can have a preferred light guiding effect, ensuring a higher brightness when the viewing angle (θ) is between 10° and 30°.

[0090] Based on the results of Tables 1 to 3 above, in one embodiment of the present disclosure, the recessed surface 21s includes a first surface 21s1 and a second surface 21s2, the angle between the first surface 21s1 and the virtual surface VS perpendicular to the flat surface 2b1 is a first angle θ1, the angle between the second surface 21s2 and the virtual surface VS is a second angle θ2, and the first angle θ1 is greater than the second angle θ2. In one embodiment of the present disclosure, the first angle θ1 may be greater than or equal to 45° and less than or equal to 70° (45°≦θ1≦70°), but is not limited thereto. In other embodiments, the first angle θ1 may be greater than or equal to 45° and less than or equal to 65° (45°≦θ1≦65°). In other embodiments, the first angle θ1 may be greater than or equal to 45° and less than or equal to 60° (45°≦θ1≦60°). In one embodiment of the present disclosure, the second angle θ2 may be greater than or equal to 0° and less than or equal to 45° (0°≦θ2≦45°), but is not limited thereto. In other embodiments, the second angle θ2 may be greater than or equal to 0° and less than or equal to 40° (0°≦θ2≦40°). In other embodiments, the second angle θ2 may be greater than or equal to 0° and less than or equal to 35° (i.e., 0°≦θ2≦35°). In one embodiment of the present disclosure, the sum of the first angle θ1 and the second angle θ2 may be greater than or equal to 50° and less than or equal to 115° (50°≦θ1+θ2≦115°), but is not limited thereto. In other embodiments, the sum of the first angle θ1 and the second angle θ2 may be greater than or equal to 60° and less than or equal to 105° (60°≦θ1+θ2≦105°). In other embodiments, the sum of the first angle θ1 and the second angle θ2 may be greater than or equal to 65° and less than or equal to 100° (65°≦θ1+θ2≦100°). When the first angle θ1 and the second angle θ2 meet the above design, the light guiding efficiency of the light guide plate 2 can be improved.

[0091] In one embodiment of the present disclosure, Figure 1As shown, these recessed structures 21 respectively have a recessed surface 21s, and the recessed surface 21s is connected to the flat surface 2b1 of the second surface 2b. In the cross-section of the light guide plate 2, the recessed surface 21s includes a first surface 21s1 and a second surface 21s2. The angle between the first surface 21s1 and the extension surface ES of the flat surface 2b1 is a third angle θ3, and the angle between the second surface 21s2 and the extension surface ES is a fourth angle θ4, and the third angle θ3 is less than the fourth angle θ4. In one embodiment of the present disclosure, the third angle θ3 may be greater than or equal to 20° and less than or equal to 45° (20°≦θ3≦45°), but is not limited thereto. In other embodiments, the third angle θ3 may be greater than or equal to 25° and less than or equal to 40° (25°≦θ3≦40°). In other embodiments, the third angle θ3 may be greater than or equal to 30° and less than or equal to 35° (30°≦θ3≦35°). In one embodiment of the present disclosure, the fourth angle θ4 may be greater than or equal to 45° and less than or equal to 90° (i.e., 45°≦θ4≦90°), but is not limited thereto. In other embodiments, the fourth angle θ4 may be greater than or equal to 50° and less than or equal to 85° (50°≦θ4≦85°). In other embodiments, the fourth angle θ4 may be greater than or equal to 55° and less than or equal to 80° (55°≦θ4≦80°). In other embodiments, the fourth angle θ4 may be greater than or equal to 60° and less than or equal to 75° (60°≦θ4≦75°). In one embodiment of the present disclosure, the sum of the third angle θ3 and the fourth angle θ4 may be greater than or equal to 65° and less than or equal to 130° (65°≦θ3+θ4≦130°), but is not limited thereto. In other embodiments, the sum of the third angle θ3 and the fourth angle θ4 may be greater than or equal to 75° and less than or equal to 120° (75°≦θ3+θ4≦120°), but is not limited thereto. In other embodiments, the sum of the third angle θ3 and the fourth angle θ4 may be greater than or equal to 85° and less than or equal to 110° (i.e., 85°≦θ3+θ4≦110°). When the third angle θ3 and the fourth angle θ4 conform to the above design, the light guiding efficiency of the light guide plate 2 may be improved.

[0092] Figure 2A 1 is a light pattern measured from the first surface of the light guide plate according to an embodiment of the present disclosure. Figure 2B 1 is a light pattern measured from the second surface of the light guide plate according to an embodiment of the present disclosure.

[0093] In one embodiment of the present disclosure, the first surface 2a and the second surface 2b are measured respectively to obtain Figure 2A The first light pattern shown and Figure 2B The second light pattern shown in FIG. wherein the light source 3 is approximately arranged at a position where ψ is 270°.

[0094] In one embodiment of the present disclosure, Figure 2A and Figure 2B As shown, in the first light pattern, the maximum brightness value can be obtained when the viewing angle (θ) is between 0° and 40° or when the viewing angle (θ) is between 20° and 40°. In the second light pattern, the maximum brightness value is obtained when the viewing angle (θ) is greater than 40°, for example, between 50° and 60°, but is not limited thereto. In addition, the ratio of the brightness at a viewing angle of 0° (i.e., θ=0°) in the first light pattern to the maximum brightness can be, for example, between 0.05 and 0.4 (for example, the ratio can be 0.1, 0.2, or 0.3). The maximum ratio of the brightness of the first light pattern to the brightness of the second light pattern is located at a position where the viewing angle is greater than or equal to 0° and less than or equal to 40°, for example, at a position where the viewing angle (θ) is 20° or 30°. At a viewing angle (θ) between 10° and 30°, the ratio of the brightness of the first light pattern to the brightness of the second light pattern is, for example, greater than or equal to 5, for example, the ratio can be 5.2, 6.3, or other values.

[0095] Figure 3 Schematic diagram of a light guide plate according to an embodiment of the present disclosure. Figure 3A and Figure 3B They are Figure 3 Partially enlarged view. Figure 3 is a cross-sectional schematic diagram of a light guide plate, Figure 3A for Figure 3 A schematic top view of part A of Figure 3B for Figure 3 Schematic diagram of top view of part B.

[0096] In one embodiment of the present disclosure, Figure 3 As shown, the light guide plate 2 may include a first portion P1, a second portion P2 and a third portion P3, wherein the third portion P3 is located between the first portion P1 and the second portion P2, wherein the first portion P1 is closer to the light source 3 than the second portion P2 and the third portion P3, and the second portion P2 is farther from the light source 3 than the first portion P1 and the third portion P3. In one embodiment of the present disclosure, the first portion P1 may be the portion of the light guide plate 2 closest to the side surface 2c, and the third portion P3 may be the portion of the light guide plate 2 farthest from the side surface 2c. In one embodiment of the present disclosure, as Figure 3 As shown, the third part P3 may also include multiple sub-parts, such as Figure 3 The three sub-parts are used as examples, but are not limited to this.

[0097] In one embodiment of the present disclosure, when viewed from the top direction (eg, Z direction) of the light guide plate 2, the density of the recessed structures 21 near the light source 3 may be less than the density of the recessed structures 21 far from the light source 3. Figure 3A and Figure 3BAs shown, when viewed from the top direction (e.g., Z direction) of the light guide plate 2, the density of the recessed structures 21 in the first portion P1 of the light guide plate 2 is less than the density of the recessed structures 21 in the second portion P2 of the light guide plate 2, or the density of the recessed structures 21 in the first portion P1 of the light guide plate 2 is less than the density of the recessed structures 21 in the third portion P3 of the light guide plate 2. In one embodiment of the present disclosure, the spacing between adjacent recessed structures 21 at locations adjacent to the light source 3 may be greater than the spacing between adjacent recessed structures 21 at locations away from the light source 3. In more detail, as shown in FIG. Figure 3A and Figure 3B As shown, in the first part P1 of the light guide plate 2, adjacent recessed structures 21 have a first spacing G1 in the first direction X, and adjacent recessed structures 21 have a second spacing G2 in the second direction Y. In the second part P2 of the light guide plate 2, adjacent recessed structures 21 have a third spacing G3 in the first direction X, and adjacent recessed structures 21 have a fourth spacing G4 in the second direction Y, wherein the first spacing G1 is, for example, greater than the third spacing G3, and / or the second spacing G2 is greater than the fourth spacing G4. The "spacing" refers to, for example, the distance between adjacent recessed structures 21 in the first direction X and / or the second direction Y. In the present disclosure, the distance between adjacent recessed structures 21 is, for example, the distance between the approximate center points of adjacent recessed structures 21, or, for example, the distance between the same sides of adjacent recessed structures 21. In one embodiment of the present disclosure, in the first direction X, the first spacing G1 and / or the second spacing G2 may be greater than the maximum width W of a certain recessed structure 21. In one embodiment (not shown), in the first direction X, the first spacing G1 and / or the second spacing G2 may be less than or equal to the maximum width W of a certain recessed structure 21. In one embodiment of the present disclosure, in the second direction Y, the third spacing G3 and / or the fourth spacing G4 may be greater than the width W' of a certain recessed structure 21. In one embodiment (not shown), in the second direction Y, the third spacing G3 and / or the fourth spacing G4 may be less than or equal to the width W' of a certain recessed structure 21.

[0098] Figure 4 Schematic diagram of a portion of an electronic device according to an embodiment of the present disclosure. Figure 4 Electronic devices and Figure 1 Similar, except for the following differences.

[0099] In one embodiment of the present disclosure, Figure 4As shown, the light guide plate 2 includes a first surface 2a, a second surface 2b, a side surface 2c and a side surface 2d, wherein the first surface 2a and the second surface 2b are opposite to each other, the side surface 2c and the side surface 2d are opposite to each other, the side surface 2c and the side surface 2d are respectively connected between the first surface 2a and the second surface 2b, and the side surface 2c is adjacent to the light source 3, and the side surface 2d is away from the light source 3, but is not limited thereto. The side surface 2c has a thickness H1, and the side surface 2d has a thickness H2, wherein the thickness H1 is greater than or equal to the thickness H2. In one embodiment of the present disclosure, as Figure 4 As shown, the thickness H1 may be greater than the thickness H2, but the present disclosure is not limited thereto. Figure 4 As shown, the flat surface 2b1 of the second surface 2b may not be perpendicular to the normal direction Z of the light guide plate 2, that is, the angle between the flat surface 2b1 and the normal direction Z of the light guide plate 2 may not be 90°, but the present disclosure is not limited to this. In other embodiments (not shown), in addition to the side surface 2c adjacent to the light source 3, another light source (not shown) may be adjacent to the side surface 2d. In one embodiment of the present disclosure, the depth D of the recessed structure 21 refers to, for example, the maximum vertical distance between the recessed structure 21 and the flat surface 2b1 or the extended surface ES in the cross-section of the light guide plate 2. In the present disclosure, the ratio of the depth D of the recessed structure 21 to the thickness H1 of the side surface 2c of the light guide plate 2 is greater than or equal to 0.0001 and less than or equal to 0.25 (0.0001≦D / H1≦0.25), but is not limited to this. In some embodiments, the ratio of the depth D to the thickness H1 is greater than or equal to 0.001 and less than or equal to 0.1 (0.001≦D / H1≦0.1). In some embodiments, the ratio of the depth D to the thickness H1 is greater than or equal to 0.002 and less than or equal to 0.05 (0.002≦D / H1≦0.05). In some embodiments, the ratio of the depth D to the thickness H1 is greater than or equal to 0.003 and less than or equal to 0.02 (0.003≦D / H1≦0.02). Through the above design, the light guiding efficiency of the light guide plate 2 can be improved.

[0100] Figure 5 Schematic diagram of a portion of an electronic device according to an embodiment of the present disclosure. Figure 5 Electronic devices and Figure 1 Similar, except for the following differences.

[0101] In one embodiment of the present disclosure, Figure 5As shown, the recessed structure 21 has a recessed surface 21s, and the recessed surface 21s is connected to the flat surface 2b1 of the second surface 2b. In the cross section of the light guide plate 2, the recessed surface 21s includes a first surface 21s1 and a second surface 21s2. The angle between the first surface 21s1 and a virtual surface VS perpendicular to the flat surface 2b1 is a first angle θ1, and the angle between the second surface 21s2 and the virtual surface VS is a second angle θ2. In the present disclosure, Figure 5 As shown, since the second surface 21s2 is substantially parallel to the virtual surface VS, the second angle θ2 can be regarded as 0°, but is not limited thereto.

[0102] In one embodiment of the present disclosure, Figure 5 As shown, the angle between the first surface 21s1 and the extension surface ES is a third angle θ3, and the angle between the second surface 21s2 and the extension surface ES is a fourth angle θ4. Figure 5 As shown, since the second surface 21s2 is substantially perpendicular to the extension surface ES, the fourth angle θ4 can be regarded as 90°, but is not limited thereto.

[0103] Figure 6 FIG. 4 is a schematic diagram of an electronic device according to an embodiment of the present disclosure.

[0104] In one embodiment of the present disclosure, Figure 6 As shown, the electronic device may include: a reflective panel 1; a light guide plate 2, which is arranged on the reflective panel 1; a light source 3, which is arranged adjacent to the light guide plate 2; an attachment 5, which is arranged between the light guide plate 2 and the reflective panel 1; a touch layer 6, which is arranged on the light guide plate 2, wherein the light guide plate 2 is arranged between the reflective panel 1 and the touch layer 6; an attachment 4, which is arranged between the light guide plate 2 and the touch layer 6; a cover substrate 8, which is arranged on the touch layer 6; and an attachment 10, which is arranged between the cover substrate 8 and the touch layer 6, but is not limited thereto. By combining with the touch layer 6, the electronic device of the present disclosure may be, for example, but not limited to, a touch display device. In other embodiments, the touch layer 6 and / or the attachment 10 may also be omitted, but is not limited thereto. The attachment 4 may, for example, include a single-layer structure or a multi-layer structure.

[0105] In the present disclosure, the reflective panel 1, the light source 3 and the attachment 4 may be as described above, and will not be described in detail here. Figure 1 , Figure 3-Figure 5As shown in any one of the above, no further details are given here. In some disclosures, the loss tangent (tanδ) of the attachment 4 at 30°C is greater than 0 and less than or equal to 5, but is not limited thereto. In some disclosures, the loss tangent (tanδ) of the attachment 4 at 30°C is greater than 0 and less than or equal to 4, but is not limited thereto. The attachment 4 is, for example, an attachment that contacts the second surface 2b of the light guide plate 2. According to some embodiments, the material of the attachment 4 may include a light-transmitting material. According to some embodiments, the material of the attachment 4 may include an acrylic polymer or other suitable material. According to some embodiments, the attachment 4 may be selected as a non-photocuring adhesive (e.g., a non-UV curing adhesive), but is not limited thereto. According to some embodiments, the loss modulus of the attachment 4 at 30°C is greater than or equal to 15Kpa and less than or equal to 200Kpa, but is not limited thereto. According to some embodiments, the loss modulus of the attachment 4 at 30°C is greater than or equal to 20Kpa and less than or equal to 165Kpa, but is not limited thereto.

[0106] The present disclosure uses a dynamic mechanical analyzer (DMA) to measure the parameters of the attachment material, and can obtain three parameter values, namely, loss tangent (tanδ), loss modulus, and storage modulus. The relationship between the three parameter values ​​of loss tangent, loss modulus, and storage modulus is as follows.

[0107] Loss tangent (tanδ) = loss modulus / storage modulus

[0108] By designing the range of the storage modulus, loss modulus and / or loss tangent of the above-mentioned attachment 4, the chance of the attachment 4 filling up the recessed structure of the light guide plate can be reduced, and the chance of the light guiding effect of the light guide plate being filled up by the attachment 4 and affecting the light guiding to darken the picture can be reduced.

[0109] In some embodiments, the adhesive 4 includes a composite layer, for example, a first layer (unlabeled) and a second layer (unlabeled) arranged on the first layer (unlabeled), the first layer (unlabeled) is a layer that contacts the second surface 2b of the light guide plate 2, and the loss tangent of the first layer (unlabeled) at 30°C is less than the loss tangent of the second layer (unlabeled) at 30°C. Therefore, in addition to taking into account the light guiding effect of the light guide plate 2, it is also possible to improve the adhesion between the components and improve the optical quality, and reduce the adhesion and optical quality caused by bubbles generated when the components are assembled.

[0110] In the present disclosure, the materials of the attachment 5 and the attachment 10 may each include polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), optical clear adhesive (OCA), optical clear resin (OCR), other suitable materials or a combination of the foregoing, but the present disclosure is not limited thereto. In the present disclosure, the touch layer 6 includes touch electrodes, wires and other components, which are not described here. The touch layer 6 can transmit signals to the reflective panel 1 through the user's contact. The touch layer 6 may also be touch glass, touch film or other components with touch function. According to some embodiments, the materials of the touch electrodes and wires may include metal materials or transparent conductive materials. The transparent conductive material may include, for example, indium tin oxide (ITO), tin oxide (SnO), zinc oxide (ZnO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), indium tin zinc oxide (ITZO), antimony tin oxide (ATO), antimony zinc oxide (AZO), other suitable transparent conductive materials or combinations thereof, but not limited thereto. According to some embodiments, the touch layer 6 may include a capacitive or resistive touch element. In the present disclosure, the material covering the substrate 8 may include glass, quartz, sapphire, ceramic, polycarbonate (PC), polyimide (PI), polypropylene (PP), polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), other suitable materials or combinations thereof, but the present disclosure is not limited thereto. In one embodiment of the present disclosure, the cover substrate 8 may be an anti-glare glass, which may be obtained by surface processing the cover substrate 8. Suitable surface processing includes spraying, coating, chemical etching, or a combination thereof, but the present disclosure is not limited thereto. The anti-glare glass may reduce reflection of light within a specified wavelength range and / or block light outside the specified wavelength range from entering, thereby increasing the transmittance of light within the specified wavelength range.

[0111] In some embodiments, a detection element (not shown) may be further provided below the reflective panel 1, and the detection element may include a resistive detection element, an electromagnetic detection element, a capacitive detection element or other suitable detection elements, but is not limited thereto. In some embodiments, the detection element may be used, for example, to detect the position of an input element, such as a contact position of an input element such as an electromagnetic pen, a stylus pen or a laser pen, or the position of an input signal, but is not limited thereto.

[0112] In one embodiment of the present disclosure, Figure 6 As shown, the electronic device may further include an anti-reflection layer 9 disposed on the cover substrate 8. The anti-reflection layer 9 may be used to reduce reflection of light within a specified wavelength range and / or block light outside the specified wavelength range from entering, so as to improve the transmittance of light within the specified wavelength range.

[0113] Figure 7 Schematic diagram of an electronic device according to an embodiment of the present disclosure. Figure 7 Electronic devices and Figure 6 Similar, except for the following differences.

[0114] In one embodiment of the present disclosure, Figure 7 As shown, the electronic device may include: a reflective panel 1; a touch layer 6 disposed on the reflective panel 1; an attachment 5 disposed between the touch layer 6 and the reflective panel 1; a light guide plate 2 disposed on the touch layer 6, wherein the touch layer 6 is disposed between the reflective panel 1 and the light guide plate 2; a light source 3 disposed adjacent to the light guide plate 2; an attachment 7 disposed between the light guide plate 2 and the touch layer 6; a cover substrate 8 disposed on the light guide plate 2; and an attachment 4 disposed between the cover substrate 8 and the light guide plate 2. By combining with the touch layer 6, the electronic device of the present disclosure may be, for example, but not limited to, a touch display device.

[0115] In the present disclosure, the reflective panel 1, the light source 3, the attachment 4, the attachment 5, the touch layer 6 and the cover substrate 8 can be as described above, and no further description is given here. In the present disclosure, the light guide plate 2 can be, for example, Figure 1 , Figure 3-Figure 5 In the present disclosure, the material of the attachment 7 may include polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), optical clear adhesive (OCA), optical clear resin (OCR), other suitable materials or a combination thereof, but is not limited thereto.

[0116] In one embodiment of the present disclosure, Figure 7As shown, the electronic device may further include an anti-reflection layer 9 disposed on the cover substrate 8. The anti-reflection layer 9 may be used to reduce reflection of light within a specified wavelength range and / or block light outside the specified wavelength range from entering, so as to improve the transmittance of light within the specified wavelength range.

[0117] The present disclosure improves the light guiding efficiency of the light guiding plate 2 by making the light guiding plate 2 have a special design, thereby achieving the goal of improving the display quality of the electronic device or reducing glare.

[0118] The above specific embodiments are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.

Claims

1. An electronic device, characterized in that: include: a reflective panel; a light guide plate disposed on the reflective panel, the light guide plate having a first surface and a second surface opposite to each other and a side surface connected between the first surface and the second surface, wherein the first surface is adjacent to the reflective panel; and a light source adjacent to the side surface; The second surface includes a plurality of concave structures, one of the plurality of concave structures has a depth in the normal direction of the reflective panel, the side surface has a thickness, and a ratio of the depth to the thickness is greater than or equal to 0.0001 and less than or equal to 0.25; Among them, after the light emitted by the light source passes through the light guide plate, a first light pattern is measured by the first surface and a second light pattern is measured by the second surface. The maximum ratio of the brightness of the first light pattern to the brightness of the second light pattern is located at a viewing angle greater than or equal to 0° and less than or equal to 40°.

2. The electronic device according to claim 1, characterized in that: When the viewing angle is between 10° and 30°, the ratio of the brightness of the first light pattern to the brightness of the second light pattern is greater than or equal to 5.

3. The electronic device according to claim 1, characterized in that: The multiple recessed structures respectively have a recessed surface, which is connected to a flat surface of the second surface. In the cross-section of the light guide plate, the recessed surface includes a first surface and a second surface. The angle between the first surface and a virtual surface perpendicular to the flat surface is a first angle, and the angle between the second surface and the virtual surface is a second angle, and the first angle is greater than the second angle.

4. The electronic device according to claim 3, characterized in that: The first angle is greater than or equal to 45° and less than or equal to 70°, and the second angle is greater than or equal to 0° and less than or equal to 45°.

5. The electronic device according to claim 3, characterized in that: The sum of the first angle and the second angle is greater than or equal to 50° and less than or equal to 115°.

6. The electronic device according to claim 1, characterized in that: The multiple recessed structures respectively have a recessed surface, which is connected to a flat surface of the second surface. In the cross-section of the light guide plate, the recessed surface includes a first surface and a second surface. The angle between the first surface and an extended surface of the flat surface is a third angle, and the angle between the second surface and the extended surface is a fourth angle, and the third angle is smaller than the fourth angle.

7. An electronic device, characterized in that: include: a reflective panel; a light guide plate disposed on the reflective panel, the light guide plate having a first surface and a second surface opposite to each other and a side surface connected between the first surface and the second surface, wherein the first surface is adjacent to the reflective panel; as well as a light source adjacent to the side surface; The second surface includes a plurality of concave structures, one of the plurality of concave structures has a depth in the normal direction of the reflective panel, the side surface has a thickness, and a ratio of the depth to the thickness is greater than or equal to 0.0001 and less than or equal to 0.25; After the light emitted by the light source passes through the light guide plate, a first light pattern is measured from the first surface, and the ratio of the brightness at a viewing angle of 0° to the maximum brightness in the first light pattern is between 0.05 and 0.

4.

8. The electronic device according to claim 7, characterized in that: After the light emitted by the light source passes through the light guide plate, a second light pattern is measured from the second surface. When the viewing angle is between 10° and 30°, the ratio of the brightness of the first light pattern to the brightness of the second light pattern is greater than or equal to 5.

9. The electronic device according to claim 7, characterized in that: The multiple recessed structures respectively have a recessed surface, which is connected to a flat surface of the second surface. In the cross-section of the light guide plate, the recessed surface includes a first surface and a second surface, the angle between the first surface and a virtual surface perpendicular to the flat surface is a first angle, and the angle between the second surface and the virtual surface is a second angle, wherein the first angle is greater than or equal to 45° and less than or equal to 70°, and the second angle is greater than or equal to 0° and less than or equal to 45°.

10. The electronic device according to claim 9, characterized in that: The sum of the first angle and the second angle is greater than or equal to 50° and less than or equal to 115°.

11. The electronic device according to claim 7, characterized in that: The multiple recessed structures respectively have a recessed surface, which is connected to a flat surface of the second surface. In the cross-section of the light guide plate, the recessed surface includes a first surface and a second surface. The angle between the first surface and an extended surface of the flat surface is a third angle, and the angle between the second surface and the extended surface is a fourth angle, and the third angle is smaller than the fourth angle.

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