Electronic device and display equipment

Abstract

The present invention discloses an electronic device and a display device. The electronic device includes a light source and a light conversion element. The light conversion element is arranged adjacent to the light source, and the light conversion element has a first surface and a second surface opposite to each other, the first surface is adjacent to the light source, and the second surface is far away from the light source. The first surface has a first glossiness, the second surface has a second glossiness, and the first glossiness is less than the second glossiness. The display device includes a display panel and a backlight module. The backlight module is arranged corresponding to the display panel, and the backlight module includes a light source and a light conversion element. The light conversion element is arranged adjacent to the light source, and the light conversion element has a first surface and a second surface opposite to each other, the first surface is adjacent to the light source, and the second surface is far away from the light source. The first surface has a first glossiness, the second surface has a second glossiness, and the first glossiness is less than the second glossiness.

Description

[0001] This application is a divisional application of the invention patent application with the application date of August 30, 2017, application number 201710764545.3, and invention name “Electronic device and display device”. Technical Field

[0002] The present invention relates to an electronic device and a display device, and in particular to an electronic device with a light conversion element and a display device with a light conversion element. Background Art

[0003] In recent years, liquid crystal display devices and various electronic products equipped with liquid crystal display panels, such as mobile phones, tablet computers, wearable devices, etc., have all been designed to be thinner. Therefore, most of the backlight modules used to provide backlight sources have been replaced by light-emitting diodes (LEDs) to replace traditional cold cathode fluorescent lamps (CCFLs) as light source generators, thereby achieving the purpose of reducing the volume of the backlight module. Since the backlight sources required in general flat-panel displays are mostly white light sources, but the current white light-emitting diodes still have problems such as poor color purity, complex structure or high production costs that need to be solved, there is currently a method of using blue light generated by blue light-emitting diodes to excite photoluminescent materials, and generate white light by mixing light. The conversion efficiency of photoluminescent materials directly affects the light conversion efficiency of the backlight module, so how to improve the conversion efficiency through innovative changes in design is indeed a topic that people in related fields continue to work on. Summary of the invention

[0004] One of the purposes of the present invention is to provide an electronic device and a display device, which improves the conversion efficiency of the light conversion element by adjusting the surface glossiness of the light conversion element, thereby improving the light conversion efficiency of the electronic device and the light conversion efficiency of the backlight module in the display device.

[0005] An embodiment of the present invention provides an electronic device including a light source and a light conversion element.

[0006] The light conversion element is disposed adjacent to the light source, and has a first surface and a second surface opposite to each other, the first surface is adjacent to the light source, and the second surface is away from the light source. The first surface has a first glossiness, and the second surface has a second glossiness, and the first glossiness is smaller than the second glossiness.

[0007] An embodiment of the present invention provides a display device, which includes a display panel and a backlight module. The backlight module is arranged corresponding to the display panel, and the backlight module includes a light source and a light conversion element. The light conversion element is arranged adjacent to the light source, and the light conversion element has a first surface and a second surface opposite to each other, the first surface is adjacent to the light source, and the second surface is away from the light source. The first surface has a first glossiness, the second surface has a second glossiness, and the first glossiness is less than the second glossiness. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of a display device according to a first embodiment of the present invention;

[0009] Figure 2 A schematic diagram of the light emission wavelength distribution of the backlight module according to the first embodiment of the present invention;

[0010] Figure 3 It is a schematic diagram of the conversion efficiency corresponding to the first glossiness and the second glossiness of the first embodiment of the present invention;

[0011] Figure 4 is a schematic diagram of a display device according to a second embodiment of the present invention;

[0012] Figure 5 is a schematic diagram of a display device according to a third embodiment of the present invention;

[0013] Figure 6 is a schematic diagram of a display device according to a fourth embodiment of the present invention;

[0014] Figure 7 is a schematic diagram of a display device according to a fifth embodiment of the present invention;

[0015] Figure 8 is a schematic diagram of a display device according to a sixth embodiment of the present invention;

[0016] Fig. 9 FIG. 4 is a schematic diagram of an electronic device according to a seventh embodiment of the present invention.

[0017] Explanation of the reference numerals: 10-backlight module; 11-light source; 11A-light emitting unit; 12-light guide plate; 12A-side; 12B-upper surface; 12C-lower surface; 13-substrate; 15-light conversion element; 15A-first layer; 15B-second layer; 15C-third layer; 19-light conversion material; 20-display panel; 20S-lower surface of display panel; 101-106-display device; 201-electronic device; D1-first direction; D2-second direction; L1-first light; L2-second light; P1-first wave crest; P2-second wave crest; R1-first relationship line; R2-second relationship line; R3-third relationship line; S1-first surface; S2-second surface. DETAILED DESCRIPTION

[0018] In order to enable the technicians familiar with the technical field of the present invention to understand the present invention, the following specifically lists multiple embodiments of the present invention, and with the accompanying drawings, the composition content of the present invention and the desired effect to be achieved are described in detail. These embodiments are not used to limit the present invention. In addition, it is understood that the terms "including" and / or "having", when used in this specification, specify the existence of the features, regions, steps, operations and / or elements, but do not exclude the existence or increase of one or more other features, regions, steps, operations, elements and / or their combinations. It should be understood that when an element such as a layer or region is referred to as being "on" or extending to "on" another element (or its variant), it can be directly on another element or directly extend to another element, or there can also be an inserted element. On the contrary, when an element is said to be "directly on" another element (or its variant) or "directly" extends to "on" another element, there is no inserted element. It should also be understood that when an element is referred to as being "coupled" to another element (or its variant), it can be directly connected to another element or indirectly connected (for example, electrically connected) to another element through one or more elements.

[0019] Please refer to Figure 1 . Figure 1 FIG. 2 is a schematic diagram of a display device according to a first embodiment of the present invention. Figure 1As shown, the present embodiment provides a display device 101, and the display device 101 includes a display panel 20 and a backlight module 10. The display panel 20 is arranged corresponding to the backlight module 10. In some embodiments, the backlight module 10 may be arranged adjacent to the lower surface 20S of the display panel 20 to provide light toward the display panel 20, and the display panel 20 may include a liquid crystal display panel, an electro-wetting display panel or other suitable non-self-luminous display panel. In some embodiments, the display device 101 may be a flexible display device (flexible display), a touch display device (touch display) or a curved display device (curved display), but is not limited thereto. The backlight module 10 may include a light source 11 and a light conversion element 15, and the light conversion element 15 is arranged adjacent to the light source 11. In some embodiments, the light source 11 may include a light emitting diode (LED), a micro light-emitting diode (micro LED), a quantum dot material, a fluorescence material, a phosphor material, other suitable light sources or a combination thereof, but not limited thereto. In addition, an optical film (not shown) may be provided between the backlight module 10 and the display panel 20 as needed, such as a diffusion film, a brightness enhancement film or / and a polarizer, etc., but not limited thereto. The type of the light conversion element 15 may include a film containing a light conversion material, a soft film containing a light conversion material, or a light conversion element formed by encapsulating the light conversion material in a container, and the light conversion element 15 may include a single-layer or multi-layer material stack structure, but not limited thereto. The above-mentioned light conversion material may include a quantum dot (QD) material, a fluorescence material, a phosphor material, other suitable photoluminescent materials or a combination of the above-mentioned materials, but not limited thereto. The light conversion element 15 has a first surface S1 and a second surface S2 opposite to each other, the first surface S1 is adjacent to the light source 11, and the second surface S2 is away from the light source 11. The first surface S1 has a first glossiness, the second surface S2 has a second glossiness, and the first glossiness is less than the second glossiness. Glossiness is a physical quantity that measures the characteristics of the surface of a material under conditions that meet international standards, and its unit can be a gloss unit (GU). The measurement can be performed according to international standards such as ISO 2813, ISO7668, ASTM D523, ASTM D2457, DIN 67530 or JIS Z8741. The gloss meter used for measurement must comply with at least one of the above international standards.For example, when measuring, the gloss meter is first used to calibrate the standard product, wherein the gloss of the standard product (n=1.567) is defined as 100GU. Then the sample is measured with the calibrated gloss meter, and the gloss meter compares and converts the measurement result of the sample with the standard product to obtain the gloss of the sample. In one embodiment, the standard product is a highly polished black glass with a flat upper surface (e.g., barium crown glass, BaK50), and the n value of the black glass measured with sodium yellow light (sodium D line, wavelength of 589.3 nanometers) is 1.567, and the gloss measurement result of this black glass is defined as 100GU.

[0020] The first surface S1 of the light conversion element 15 can be regarded as a light incident surface of the light conversion element 15, and the second surface S2 of the light conversion element 15 can be regarded as a light emitting surface of the light conversion element 15, but the present invention is not limited thereto. Figure 1After the first light L1 (shown in FIG. 1 ) enters the light conversion element 15 from the first surface S1 of the light conversion element 15, it can react with the light conversion material in the light conversion element 15 (e.g., excite, filter, or enhance) to emit a second light L2 different from the first light L1 at the second surface S2 of the light conversion element 15, thereby achieving a light conversion effect. For example, the first light L1 can be blue light, and the light conversion material in the light conversion element 15 can convert the blue light into light of other colors (e.g., red light and green light), and part of the first light L1 can penetrate the light conversion element 15 and form a mixed second light (e.g., white light) with the light of other colors converted by the light conversion element 15, but the present invention is not limited thereto. In some embodiments, the color of the first light L1 and / or the light conversion material in the light conversion element 15 can be adjusted according to the required light conversion efficiency of the backlight module to obtain the required second light L2. In one embodiment, the light conversion element includes a light conversion material that can convert the color of the excitation light into another color. In other embodiments, the light conversion element includes a light conversion material that can convert the color of the excitation light into multiple colors. The type and proportion of the light conversion material can be selected according to the needs, but it is not limited thereto. The characteristics of the first surface S1 of the light conversion element 15 facing the light source 11 will affect the light path of the first light L1 in the light conversion element 15 after entering the light conversion element 15. When the first glossiness of the first surface S1 is reduced, the condition of the first light L1 entering the light conversion element 15 from the first surface S1 (such as the light entry path or light entry uniformity) will be improved. On the other hand, when the second glossiness of the second surface S2 is increased, the first light L1 that enters the light conversion element 15 and is not converted by the light conversion material can be partially reflected and re-enters the light conversion element 15 to increase the chance of being converted by the light conversion material. Therefore, when the first glossiness of the first surface S1 is relatively low and the second glossiness of the second surface S2 is relatively high, the light conversion element 15 can have a higher conversion efficiency, so the first glossiness must be smaller than the second glossiness. However, when the second glossiness of the second surface S2 is too high, the probability of reflection will be too high, resulting in a decrease in the amount of light output. Therefore, the first glossiness of the first surface S1 and the second glossiness of the second surface S2 must be matched within a better design range.

[0021] Please refer to Figures 1 to 3 . Figure 2 FIG. 1 is a schematic diagram showing the wavelength distribution of the light emitted by the backlight module 10 of this embodiment. Figure 3 It is a schematic diagram showing the conversion efficiency corresponding to the first glossiness and the second glossiness of this embodiment. Figure 2The figure shows the wavelength distribution of the second light L2, wherein the first peak P1 corresponds to blue light and the second peak P2 corresponds to green light. A conversion efficiency R can be defined as the ratio of the green light intensity to the blue light intensity in the second light L2 (e.g., R=IG / IB, IG represents the green light intensity, and IB represents the blue light intensity). In other words, when the first light L1 is blue light, and the light conversion material in the light conversion element 15 converts the blue light into red light and green light, the conversion performance of the light conversion element 15 can be evaluated by the above conversion efficiency R. It should be noted that, if Figure 2 The wavelength distribution shown is measured by the second light L2 emitted by the backlight module 10 after passing through the light conversion element 15. The second light L2 does not pass through the display panel 20. Figure 3 The conversion efficiency R is represented by the combination of the first glossiness and the second glossiness. In one embodiment, Figure 3 The distribution of can be presented by the following regression equation:

[0022]

[0023] Where a0 = 0.29939, a1 = -0.0025454, a2 = 0.0041898, a3 = -0.00001273, a4 = -0.11051, B represents the value of the first glossiness (in GU), and T represents the value of the second glossiness (in GU). Then, by partially differentiating the above regression equation with respect to T, the relationship between the maximum value of the conversion efficiency R and T and B can be found, and the following relationship (I) can be obtained:

[0024]

[0025] Arranging equation (I) yields:

[0026]

[0027] That is, the second glossiness T can be regarded as a function related to the first glossiness B. Then, by substituting the values ​​of a2, a3 and a4 and considering the process variation (e.g., about ±15 GU), the following relationship (II) can be obtained:

[0028]

[0029] in, Figure 3 The first relationship line R1 in the equation may correspond to the above relationship (I). Figure 3The area between the second relationship line R2 and the third relationship line R3 in the above relationship formula (II) can correspond to the state of the above relationship formula (II). In other words, the combination of the first glossiness B and the second glossiness T that can present a better conversion efficiency can be obtained by calculation according to the relationship formula (II). In other words, if the value of the first glossiness B has been determined, the range of the second glossiness T can be calculated by the above relationship formula (II). In addition, considering the above relationship formula (II) and the feasibility of the process, the first glossiness B can be greater than or equal to 35 glossiness units and less than or equal to 130 glossiness units, and the second glossiness T can be greater than or equal to 40 glossiness units and less than or equal to 135 glossiness units, but it is not limited thereto. The first glossiness B and the second glossiness T can be adjusted by adjusting the material composition contained in the light conversion element 15 or the conditions of the designed first surface S1 and the second surface S2 to meet the above relationship formula (II), so that the light conversion element 15 can have a better conversion efficiency, thereby improving the light conversion efficiency of the backlight module 10.

[0030] The following will be described with respect to different embodiments of the present invention, and for the sake of simplicity, the following description will mainly describe in detail the different parts of each embodiment, and will not repeat the same parts. In addition, the same elements in each embodiment of the present invention are marked with the same reference numerals to facilitate comparison between the embodiments.

[0031] Please refer to Figure 4 . Figure 4 FIG. 1 is a schematic diagram of a display device 102 according to a second embodiment of the present invention. Figure 4 As shown, the difference from the first embodiment is that the backlight module 10 of this embodiment may further include a light guide plate 12 disposed adjacent to the light source 11, the light source 11 may be disposed on the side surface 12A of the light guide plate 12, and at least part of the light conversion element 15 may be disposed between the light guide plate 12 and the display panel 20. In other words, the normal direction of the upper surface 12B (light emitting surface) of the light guide plate 12 may be a second direction D2, a first direction D1 is perpendicular to the second direction D2, the light source 11 may be disposed on at least one side surface of the light guide plate 12 in the first direction D1, and the light conversion element 15 may be disposed on the upper surface 12B of the light guide plate 12 facing the display panel 20 in the second direction D2, and the second direction D2 may be regarded as the thickness direction of the light guide plate 12, but is not limited thereto. Therefore, the backlight module of this embodiment may be regarded as an edge-entry backlight module. In addition, the light guide plate 12 may include a light guide plate formed of glass material, polymer material such as acrylic (polymethyl methacrylate, PMMA), other materials that can withstand the high temperature generated by the light source 11, or other materials suitable as a light guide plate, but are not limited to this, and the shape of the light guide plate 12 may include regular, irregular and / or asymmetric shapes, but is not limited to this.

[0032] Please refer to Figure 5 . Figure 5 FIG. 1 is a schematic diagram of a display device 103 according to a third embodiment of the present invention. Figure 5 As shown, the difference from the first embodiment is that the light conversion element 15 of this embodiment may include a multi-layer structure, for example, the light conversion element 15 may include a first layer 15A, a second layer 15B and a third layer 15C, the second layer 15B may be disposed between the first layer 15A and the third layer 15B in the second direction D2, and the second layer 15B may include a light conversion material 19. In some embodiments, the light conversion material 19 may include a quantum dot material, a fluorescent material, a phosphorescent material, other suitable photoluminescent materials or a combination of the above materials, but not limited thereto. In addition, the first layer 15A or the third layer 15C may include a protective layer to protect the second layer 15B having the light conversion material 19, but not limited thereto. In some embodiments, the first layer 15A, the second layer 15B and the third layer 15C may be formed of the same material, or the material of the second layer 15B may be different from the material of the first layer 15A or the third layer 15C, but not limited thereto. In other embodiments, the material of the second layer 15B may have a similar refractive index to that of the first layer 15A or the third layer 15C, or the refractive index of the material of the second layer 15B may be greater than that of the material of the third layer 15C, but the invention is not limited thereto. For example, if the protective effect of the first layer 15A or the third layer 15C is considered, a material with a higher protective strength, such as a polymer material, may be used to form the first layer 15A or the third layer 15C, while the second layer 15B may be formed by a material that is easier to uniformly incorporate the light conversion material 19, such as a resin material, but the invention is not limited thereto. In addition, the first glossiness of the first surface S1 and the second glossiness of the second surface S2 may also be controlled by selecting the material combination of the first layer 15A and the third layer 15C, the film forming condition, and / or the surface condition.

[0033] Please refer to Figure 6 and Figure 7 . Figure 6 FIG. 1 is a schematic diagram of a display device 104 according to a fourth embodiment of the present invention. Figure 7 FIG. 1 is a schematic diagram of a display device 105 according to a fifth embodiment of the present invention. Figure 6 and Figure 7 As shown, the difference from the second embodiment is that, in some embodiments, the light conversion element 15 can be disposed on the side surface 12A of the light guide plate 12, and the light conversion element 15 can be disposed between the light guide plate 12 and the light source 11 in the first direction D1. Figure 6As shown, in some embodiments, the light conversion element 15 can be fixed on the light guide plate 12 as needed, and the second surface S2 of the light conversion element 15 can directly contact the side surface 12A of the light guide plate 12, but it is not limited thereto. In other embodiments, the second surface S2 of the light conversion element 15 can be fixed to the side surface 12A of the light guide plate 12 through other adhesive layers or other elements. Figure 7 As shown, in some embodiments, the light conversion element 15 can be fixed on the light source 11, and the first surface S1 of the light conversion element 15 can directly contact the light source 11, but it is not limited thereto. In other embodiments, the first surface S1 of the light conversion element 15 can be fixed on the light source 11 through other adhesive layers or other elements. It is worth noting that in some embodiments, the light conversion element 15 can be in the form of a film and at least partially disposed on at least a portion of the side surface 12A, at least a portion of the upper surface 12B, or / and at least a portion of the lower surface 12C of the light guide plate 12.

[0034] Please refer to Figure 8 . Figure 8 FIG. 1 is a schematic diagram of a display device 106 according to a sixth embodiment of the present invention. Figure 8 As shown, the difference from the first embodiment is that the backlight module 10 of this embodiment may further include a substrate 13, the substrate 13 may be arranged corresponding to the display panel 20, the light source 11 may be arranged on the substrate 13, and at least part of the light conversion element 15 may be arranged between the display panel 20 and the light source 11. In one embodiment, the light conversion element 15 may be a film type or a flexible substrate and cover the light source 11. For example, the light source 11 may include a plurality of light emitting elements 11A arranged on the substrate 13, and at least part of the light conversion element 15 may cover at least one of the plurality of light emitting elements 11A. In some embodiments, the substrate 13 may include a single-layer or multi-layer structure with reflectivity, but is not limited thereto. The substrate 13 may be a glass substrate, a printed circuit board, a flexible printed circuit board, a flexible substrate, a metal substrate, a backplane or other elements that can carry the light source 11, but is not limited thereto. The light emitting element 11A may, for example, include a light emitting diode, a micro light emitting diode, a quantum dot material, a fluorescent material, a phosphorescent material, other suitable light sources or a combination thereof, but is not limited thereto.

[0035] Please refer to Fig. 9 . Fig. 9 FIG. 2 is a schematic diagram of an electronic device 201 according to a seventh embodiment of the present invention. Fig. 9As shown, the electronic device 201 may include a light source 11 and a light conversion element 15, and the light conversion element 15 is disposed adjacent to the light source 11. The light conversion element 15 has a first surface S1 and a second surface S2 opposite to each other, the first surface S1 is adjacent to the light source 11, and the second surface S2 is away from the light source 11. The first surface S1 has a first glossiness, the second surface S2 has a second glossiness, and the first glossiness is less than the second glossiness. As described in the above embodiment, the first glossiness and the second glossiness may meet the following relationship (II):

[0036]

[0037] Wherein B represents the value of the first glossiness, T represents the value of the second glossiness, and the units of the first glossiness and the second glossiness are glossiness units (GU). In some embodiments, the first glossiness may be greater than or equal to 35 glossiness units and less than or equal to 130 glossiness units, and the second glossiness may be greater than or equal to 40 glossiness units and less than or equal to 135 glossiness units, but is not limited thereto. The relevant technical features of the light source 11 and the light conversion element 15 have been described in the above embodiments, so they will not be repeated here. It is worth noting that the backlight module 10 in the above-mentioned first to sixth embodiments can be regarded as the electronic device provided by the present invention. For example, if Figure 5 As shown, in some embodiments, the light conversion element in the electronic device may include a first layer 15A, a second layer 15B and a third layer 15C, the second layer 15B may be disposed between the first layer 15A and the third layer 15B in the second direction D2, and the second layer 15B may include a light conversion material 19. However, the electronic device provided by the present invention is not limited to being used as a backlight module of a display device, and the electronic device provided by the present invention may also be applied to other light-emitting purposes as needed.

[0038] In summary, in the electronic device and display device provided by the present invention, the surface glossiness of the light conversion element can be adjusted so that the first glossiness of the first surface of the light conversion element adjacent to the light source is lower than the second glossiness of the second surface of the light conversion element away from the light source. The lower first glossiness can improve the light entry path or light entry uniformity of the light entering the light conversion element, while the higher second glossiness can make the light that enters the light conversion element and is not converted by the light conversion material be reflected and re-enter the light conversion element to increase the chance of being converted by the light conversion material. Therefore, when the first glossiness is lower than the second glossiness, the conversion efficiency of the light conversion element can be improved, thereby improving the light conversion efficiency of the electronic device and the backlight module.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electronic device, characterized in that: include: a light source; a light guide plate, which is disposed adjacent to the light source, and the light source is disposed on a side of the light guide plate; as well as A light conversion element is disposed adjacent to the light source, the light conversion element having a first surface and a second surface opposite to each other, the first surface being adjacent to the light source, and the second surface being away from the light source, wherein the first surface has a first glossiness, the second surface has a second glossiness, the first glossiness is less than the second glossiness, and the first glossiness and the second glossiness meet the following relationship: Wherein B represents the value of the first glossiness, T represents the value of the second glossiness, the units of the first glossiness and the second glossiness are glossiness units, and the first glossiness is greater than or equal to 35 glossiness units and less than or equal to 130 glossiness units, wherein at least a portion of the light conversion element is disposed on the light guide plate, The light conversion element includes a first layer, a second layer and a third layer, the second layer is arranged between the first layer and the third layer, the first surface is the surface of the first layer, the second surface is the surface of the third layer, and the material refractive index of the second layer is greater than the material refractive index of the third layer.

2. The electronic device according to claim 1, wherein: The second glossiness is greater than or equal to 40 gloss units and less than or equal to 135 gloss units.

3. The electronic device according to claim 1, wherein: The second layer includes a light conversion material.

4. The electronic device as claimed in claim 3, characterized in that: The light conversion material is a quantum dot material.

5. The electronic device according to claim 1, wherein: The invention further comprises a display panel, wherein at least a part of the light conversion element is disposed between the light guide plate and the display panel.

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