Liquid crystal display and electronic device

Abstract

The application relates to the technical field of display screens, in particular to a liquid crystal display screen and electronic equipment. The liquid crystal display screen comprises a backlight module, the backlight module comprises a light source, the light source comprises a light emitter and first fluorescent powder, the light emitter can emit blue light, and the first fluorescent powder is filled on the light emitting side of the light emitter; an optical film is arranged on the propagation path of the blue light emitted by the light source, the optical film is filled with second fluorescent powder, the heat resistance of the second fluorescent powder is weaker than that of the first fluorescent powder, and the distance between the second fluorescent powder and the light emitter is greater than the distance between the first fluorescent powder and the light emitter; one of the first fluorescent powder and the second fluorescent powder is green fluorescent powder, and the other is red fluorescent powder. The application can reduce the problems of brightness attenuation and color drift of the liquid crystal display screen after long-term use.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a liquid crystal display screen and an electronic device. Background Technology

[0002] With the rapid development of technology and the continuous improvement of people's living standards, automobiles have evolved from simple means of transportation into mobile living spaces that integrate intelligence, comfort, and safety. The electronic display technology inside them is also constantly being innovated. As a key technology, LCD screens are gradually showing irreplaceable value in the automotive field.

[0003] In related technologies, the light source of a liquid crystal display (LCD) includes an emissive element and a phosphor. When the light source emits light, the emissive element emits blue light, and the phosphor, excited by the blue light, produces red and green light. The three colors of light mix to form white light. This white light, when incident on the LCD panel, can be modulated into different colors to meet the diverse needs of the displayed content. However, after prolonged use, LCDs using this technology suffer from problems such as brightness decay and color drift. Utility Model Content

[0004] This application discloses a liquid crystal display screen and an electronic device that can reduce the problems of brightness decay and color drift that occur in liquid crystal displays after long-term use.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application disclose a liquid crystal display screen, comprising:

[0006] Backlight module, the backlight module comprising:

[0007] The light source includes a light emitter and a first phosphor, wherein the light emitter is capable of emitting blue light and the first phosphor fills the light-emitting side of the light emitter;

[0008] An optical film is disposed in the propagation path of the blue light emitted by the light source. The optical film is filled with a second phosphor. The heat resistance of the second phosphor is weaker than that of the first phosphor, and the distance between the second phosphor and the light emitter is greater than the distance between the first phosphor and the light emitter.

[0009] One of the first phosphor and the second phosphor is a green phosphor, and the other is a red phosphor.

[0010] In one alternative embodiment, the first phosphor is a green phosphor.

[0011] In one optional embodiment, the first phosphor is a β-SiAlON phosphor.

[0012] In one alternative embodiment, the optical film is one of a diffuser sheet, a prism sheet, and a reflective brightening film; and / or, the filling thickness of the first phosphor is less than the filling thickness of the second phosphor.

[0013] In one optional embodiment, the backlight module further includes a light guide plate having a light incident surface and a light emitting surface, the light incident surface being located on the periphery of the light guide plate, and the light emitting surface being located on one side of the light guide plate along its own thickness direction;

[0014] The light guide plate is located on the light-emitting side of the light source, and the light-incident surface is disposed facing the light source. The optical film is located on one side of the light-emitting surface and is disposed facing the light-emitting surface.

[0015] In one alternative embodiment, the light guide plate is made of a heat-insulating material.

[0016] In one alternative embodiment, the liquid crystal display screen further includes an annular heat insulation element disposed around the optical film.

[0017] In one optional embodiment, the outer edge of the light guide plate extends beyond the outer edge of the optical film. Along the thickness direction of the light guide plate, the heat insulation member is disposed opposite to the light guide plate, and the heat insulation member is in contact with the light emitting surface.

[0018] Secondly, embodiments of this application disclose an electronic device including the liquid crystal display screen described in any of the above embodiments.

[0019] In one alternative embodiment, the electronic device is a car.

[0020] Compared with related technologies, the beneficial effects of this application are:

[0021] In this application, the light source includes a light emitter and a first phosphor. An optical film is disposed in the propagation path of the blue light emitted by the light source. The optical film is filled with a second phosphor. One of the first phosphor and the second phosphor is a green phosphor, and the other is a red phosphor. Therefore, when the first phosphor and the second phosphor are activated by the blue light emitted by the light emitter, one of the first phosphor and the second phosphor will emit green light, and the other will emit red light. The green light, red light and blue light mix to form a white backlight.

[0022] The second phosphor, which has poor heat resistance, is further away from the light emitter than the first phosphor, which has strong heat resistance. This reduces the negative impact of the heat generated by the light emitter on the second phosphor. Thus, even under the combined effect of the heat emitted by the light emitter and the ambient heat, the performance of the second phosphor is not easily degraded, thereby reducing the risk of brightness decay and color drift in the liquid crystal display. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional view of a portion of the structure of the liquid crystal display screen disclosed in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Backlight module; 110. Light source; 111. Light emitter; 112. First phosphor; 120. Optical film; 121. Second phosphor;

[0027] 200, Light guide plate; 201, Light incident surface; 202, Light emitting surface;

[0028] 300. Thermal insulation components;

[0029] 400. Reflective film;

[0030] 500. LCD panel. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0033] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0034] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0036] With the rapid development of technology and the continuous improvement of people's living standards, automobiles have evolved from simple means of transportation into mobile living spaces that integrate intelligence, comfort, and safety. The electronic display technology inside them is also constantly being innovated. As a key technology, LCD screens are gradually showing irreplaceable value in the automotive field.

[0037] In related technologies, the light source of a liquid crystal display includes an emissive and a phosphor. When the light source emits light, the emissive emitter emits blue light, and the phosphor is excited by the blue light to produce red and green light. The three colors of light are mixed to form white light. After the white light enters the liquid crystal panel of the liquid crystal display, it can be modulated into different colors of light by the liquid crystal panel to meet the needs of diverse display content.

[0038] The inventors discovered that phosphors have limited heat resistance, and cars are often parked outdoors in the sun for extended periods. The ambient temperature is transferred to the phosphors in the light source, and the heat generated by the light-emitting body during emission is also transferred to the phosphors. Under the combined effect of these two temperatures, the performance of the phosphors degrades, leading to a decrease in the brightness and color drift of the LCD screen.

[0039] The liquid crystal display screen and electronic device provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0040] like Figure 1 As shown in the figure, this application discloses a liquid crystal display screen, including:

[0041] Backlight module 100, the backlight module 100 includes:

[0042] The light source 110 includes a light emitter 111 and a first phosphor 112. The light emitter 111 emits blue light, and the first phosphor 112 fills the light-emitting side of the light emitter 111. For example, the light source 110 includes a lamp housing, and the first phosphor 112 fills the lamp housing.

[0043] An optical film 120 is disposed in the propagation path of the blue light emitted by the light source 110. The optical film 120 is filled with a second phosphor 121. The heat resistance of the second phosphor 121 is weaker than that of the first phosphor 112, and the distance between the second phosphor 121 and the light emitter 111 is greater than the distance between the first phosphor 112 and the light emitter 111. For example, the optical film 120 is one of a diffuser, a prism sheet, and a reflective brightness enhancement film. The diffuser can distribute light evenly, improve the softness of light, and avoid light spots or uneven brightness. The prism sheet can enhance the brightness of light in a specific direction (such as the viewing direction) by refracting and focusing light, thereby improving the light emission efficiency and reducing light divergence loss. The reflective brightness enhancement film can reflect light that might otherwise escape from the optical system and guide it back into the system, thereby improving the light utilization efficiency, enhancing the brightness of the liquid crystal display screen, and optimizing the light distribution so that the light is more concentrated in the effective display area.

[0044] For example, the liquid crystal display screen also includes a liquid crystal panel 500, which is located on the light-emitting side of the optical film 120. The white backlight emitted by the backlight module 100 can be modulated into different colors of light by the liquid crystal panel 500 to meet the needs of diverse display content.

[0045] It should be noted that the distance between the second phosphor 121 and the luminescent body 111 is the minimum straight-line distance between the second phosphor 121 and the luminescent body 111; the distance between the first phosphor 112 and the luminescent body 111 is the minimum straight-line distance between the first phosphor 112 and the luminescent body 111.

[0046] One of the first phosphor 112 and the second phosphor 121 is a green phosphor, and the other is a red phosphor.

[0047] In this application, the light source 110 includes a light emitter 111 and a first phosphor 112. An optical film 120 is disposed in the propagation path of the blue light emitted by the light source 110. The optical film 120 is filled with a second phosphor 121. One of the first phosphor 112 and the second phosphor 121 is a green phosphor and the other is a red phosphor. Therefore, when the first phosphor 112 and the second phosphor 121 are activated by the blue light emitted by the light emitter 111, one of the first phosphor 112 and the second phosphor 121 will emit green light and the other will emit red light. The green light, red light and blue light are mixed to form a white backlight.

[0048] The second phosphor 121, which has poor heat resistance, is further away from the light emitter 111 than the first phosphor 112, which has strong heat resistance. This reduces the negative impact of the heat generated by the light emitter 111 on the second phosphor 121. Thus, even under the combined effect of the heat emitted by the light emitter 111 and the ambient heat, the performance of the second phosphor 121 is not easily degraded, thereby reducing the risk of brightness decay and color drift in the liquid crystal display.

[0049] In one optional embodiment, the first phosphor 112 is a green phosphor. For example, the first phosphor 112 here can be a β-SiAlON phosphor, which has strong heat resistance and is less prone to performance degradation under high temperatures. The red phosphor can be made from red fluorescent oil-soluble cadmium telluride, red fluorescent oil-soluble cadmium selenide, or red fluorescent oil-soluble zinc sulfide; this application does not limit this.

[0050] In this embodiment, the first phosphor 112 filled on the light-emitting side of the light emitter 111 is a green phosphor, and the second phosphor 121 filled in the optical film 120 is a red phosphor. The blue light emitted by the light emitter 111 will sequentially excite the green phosphor and the red phosphor. After the blue light emitted by the light emitter 111 excites the green phosphor, the green phosphor will emit green light. The green light will irradiate the red phosphor along with the blue light. Since the energy of both blue light and green light is higher than that of red light, both blue light and green light can excite red light to improve the light energy conversion efficiency.

[0051] In one optional embodiment, the filling thickness of the first phosphor 112 is less than the filling thickness of the second phosphor 121, that is, the thickness of the first phosphor layer formed by the first phosphor 112 in the light source 110 is less than the thickness of the second phosphor layer formed by the second phosphor 121 in the optical film 120.

[0052] In this embodiment, since the first phosphor 112 is located near the light emitter 111, it is significantly affected by the heat emitted by the light emitter 111. Making the filling thickness of the first phosphor 112 smaller than that of the second phosphor 121 helps dissipate heat from the first phosphor layer formed by the first phosphor 112, preventing it from being exposed to high temperatures and reducing the risk of performance degradation. Of course, the filling thickness of the first phosphor 112 can also be greater than or equal to the filling thickness of the second phosphor 121; this application does not impose any limitation on this.

[0053] In an optional embodiment, the backlight module 100 further includes a light guide plate 200, which has a light-incident surface 201 and a light-emitting surface 202. The light-incident surface 201 is located on the periphery of the light guide plate 200, and the light-emitting surface 202 is located on one side of the light guide plate 200 along its thickness direction. The light guide plate 200 is located on the light-emitting side of the light source 110, and the light-incident surface 201 is disposed facing the light source 110. The optical film 120 is located on one side of the light-emitting surface 202 and is disposed facing the light-emitting surface 202. For example, a reflective film 400 is provided on the side of the light guide plate 200 away from the optical film 120. The reflective film 400 can guide the escaped light back to the light guide plate 200, reducing light waste. At the same time, the reflective film 400 may participate in optical modulation to improve the uniformity of light distribution, so that the light covers the entire screen more evenly.

[0054] In this embodiment, the backlight module 100 includes a light guide plate 200 located on the light-emitting side of the light source 110. An optical film 120 is located on the light-emitting side of the light guide plate 200. The blue light emitted by the light emitter 111 can be uniformly distributed by the light guide plate 200, thereby improving the uniformity of blue light distribution and more uniformly exciting the second phosphor 121, thus improving light conversion efficiency. Furthermore, compared to direct-lit embodiments, this embodiment uses side lighting, which reduces the number of light emitters 111, thereby reducing the total heat generated by each light emitter 111 and further preventing performance degradation of the first phosphor 112 and the second phosphor 121. Of course, the liquid crystal display screen can also adopt a direct-lit mode; this application does not limit this.

[0055] The heat emitted by the light emitter 111 is transferred to the vicinity of the light guide plate 200. To prevent the heat from being transferred through the light guide plate 200 to the optical film 120 and negatively affecting the second phosphor 121, in an optional embodiment, the light guide plate 200 is made of a heat-insulating material. Exemplarily, the light guide plate 200 can be made of materials such as polymethyl methacrylate, polycarbonate, and polystyrene, and this application is not limited thereto.

[0056] In this embodiment, the light guide plate 200 is made of heat-insulating material, thus possessing excellent heat insulation performance. When the heat generated by the light emitter 111 is transferred to the vicinity of the light guide plate 200, the light guide plate 200 can slow down the rate at which heat is transferred from one side of the light guide plate 200 to the side of the optical film 120, thereby reducing the ambient temperature of the second phosphor 121 and minimizing the risk of performance degradation of the second phosphor 121. Of course, the light guide plate 200 may not be made of heat-insulating material, in which case the light guide plate 200 will not have good heat insulation properties, and this application does not impose any limitations on this.

[0057] In order to prevent heat from being directly transferred from the periphery of the optical film 120 to the optical film 120 and to reduce the ambient temperature of the second phosphor 121 within the optical film 120, in an optional embodiment, the liquid crystal display screen further includes an annular heat insulation member 300, the heat insulation member 300 being disposed around the optical film 120.

[0058] In this embodiment, the heat insulation element 300 is disposed around the periphery of the optical film 120. That is, the optical film 120 is disposed inside the heat insulation element 300. When the heat emitted by the light emitter 111 moves outside the heat insulation element 300, the heat insulation element 300 will prevent the heat from moving into the interior of the heat insulation element 300. Since the optical film 120 is disposed inside the heat insulation element 300, this embodiment can prevent heat from moving to the vicinity of the optical film 120, so as to ensure that the optical film 120 is at a lower ambient temperature and prevent the second phosphor 121 inside the optical film 120 from experiencing performance degradation.

[0059] In one optional embodiment, the outer edge of the light guide plate 200 extends beyond the outer edge of the optical film 120. Along the thickness direction of the light guide plate 200, the heat insulation member 300 is disposed opposite to the light guide plate 200, and the heat insulation member 300 is in contact with the light emitting surface 202.

[0060] In this embodiment, the heat insulation component 300 is disposed opposite to the light guide plate 200 and is in contact with the light emitting surface 202 of the light guide plate 200. This eliminates the gap between the heat insulation component 300 and the light emitting surface 202, preventing heat from leaking from the gap between the heat insulation component 300 and the light emitting surface 202 to the vicinity of the optical film 120. This further ensures that the optical film 120 is kept at a lower ambient temperature, preventing the performance degradation of the second phosphor 121 inside the optical film 120. Of course, the heat insulation component 300 and the light emitting surface 202 of the light guide plate 200 may not be in contact, and this application does not limit this.

[0061] This application also discloses an electronic device including a liquid crystal display screen as described in any of the above embodiments, thereby enabling the electronic device to possess the beneficial effects of the liquid crystal display screen described in any of the above embodiments. This application does not limit the scope of the application. For example, the electronic device may be a car, television, mobile phone, computer, etc., and this application does not limit the type of electronic device.

[0062] The foregoing embodiments of this application focus on describing the differences between various embodiments. As long as the different optimization features between embodiments are not contradictory, they can be combined to form better embodiments. For the sake of brevity, these differences will not be elaborated upon here. The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of this application, can make many modifications without departing from the spirit and scope of the claims, all of which fall within the protection scope of this application.

Claims

1. A liquid crystal display screen, characterized in that, include: A backlight module (100), the backlight module (100) comprising: The light source (110) includes a light emitter (111) and a first phosphor (112), wherein the light emitter (111) is capable of emitting blue light and the first phosphor (112) is filled in the light-emitting side of the light emitter (111); An optical film (120) is disposed in the propagation path of the blue light emitted by the light source (110). The optical film (120) is filled with a second phosphor (121). The heat resistance of the second phosphor (121) is weaker than that of the first phosphor (112), and the distance between the second phosphor (121) and the light emitter (111) is greater than the distance between the first phosphor (112) and the light emitter (111). One of the first phosphor (112) and the second phosphor (121) is a green phosphor and the other is a red phosphor.

2. The liquid crystal display screen according to claim 1, characterized in that, The first phosphor (112) is a green phosphor.

3. The liquid crystal display screen according to claim 2, characterized in that, The first phosphor (112) is a β-SiAlON phosphor.

4. The liquid crystal display screen according to claim 1, characterized in that, The optical film (120) is one of a diffuser sheet, a prism sheet, and a reflective brightening film; and / or, the filling thickness of the first phosphor (112) is less than the filling thickness of the second phosphor (121).

5. The liquid crystal display screen according to claim 1, characterized in that, The backlight module (100) further includes a light guide plate (200), which has a light incident surface (201) and a light emitting surface (202). The light incident surface (201) is located on the periphery of the light guide plate (200), and the light emitting surface (202) is located on one side of the light guide plate (200) along its own thickness direction. The light guide plate (200) is located on the light-emitting side of the light source (110), and the light-incident surface (201) is disposed facing the light source (110). The optical film (120) is located on one side of the light-emitting surface (202) and is disposed facing the light-emitting surface (202).

6. The liquid crystal display screen according to claim 5, characterized in that, The light guide plate (200) is made of heat-insulating material.

7. The liquid crystal display screen according to claim 5, characterized in that, The liquid crystal display screen also includes a ring-shaped heat insulation element (300) that surrounds the optical film (120).

8. The liquid crystal display screen according to claim 7, characterized in that, The outer edge of the light guide plate (200) extends beyond the outer edge of the optical film (120). Along the thickness direction of the light guide plate (200), the heat insulation member (300) is disposed opposite to the light guide plate (200), and the heat insulation member (300) is in contact with the light emitting surface (202).

9. An electronic device, characterized in that, The liquid crystal display screen includes any one of claims 1 to 8.

10. The electronic device according to claim 9, characterized in that, The electronic device is a car.

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