CN211826816U

CN211826816U - Backlight illumination device and HUD

Info

Publication number: CN211826816U
Application number: CN201922219749.6U
Authority: CN
Inventors: 张雪冰; 苗顺平; 马斌斌
Original assignee: Suzhou Carrobot Automotive Electronics Technology Co ltd
Current assignee: BEIJING ILEJA TECH. Co.,Ltd.
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-10-30
Anticipated expiration: 2029-12-11

Abstract

The application discloses backlight device, HUD. This backlight lighting device includes LED lamp plate, lens array and LCD subassembly the lens array with between the LCD, still include: the expansion device is used for scattering incident light which is emitted by the LED lamp panel and passes through the lens array; the visible light emitted by the LED lamp panel is natural light, namely unpolarized light; polarization reflection means for receiving the visible light scattered by the extension means, allowing horizontally polarized light of the visible light to pass therethrough, and reflecting vertically polarized light; when the reflected vertical polarized light is incident to the expansion device, the polarized light is scattered and then becomes visible light, then the visible light penetrates through the lens array to be incident to the LED lamp panel, and the visible light is reflected back to the lens array through the LED lamp panel for recycling. The backlight illumination device solves the technical problems of large power consumption and high temperature of the backlight illumination device.

Description

Backlight illumination device and HUD

Technical Field

The application relates to a new line display device field particularly, relates to a backlight lighting device, HUD.

Background

Front mounted HUDs have a high requirement for virtual image brightness, for example, using a TFT-LCD display scheme.

The inventor finds that the highest brightness in the imaging system of the HUD needs to reach 15000cd/m2, and the light energy utilization rate in the imaging system is only about 10% -15%. This results in a high power consumption required for backlighting and a relatively high temperature rise when the LCD is exposed to high brightness illumination.

Aiming at the problems of large power consumption and high temperature of the backlight illumination device in the related art, no effective solution is provided at present.

SUMMERY OF THE UTILITY MODEL

The main objective of the present application is to provide a backlight device and a HUD, so as to solve the problems of large power consumption and high temperature of the backlight device.

In order to achieve the above object, according to one aspect of the present application, there is provided a backlight illumination device.

The backlight illumination device according to the present application includes: LED lamp plate, lens array and LCD subassembly the lens array with between the LCD, still include: the expansion device is used for scattering incident light which is emitted by the LED lamp panel and passes through the lens array; the visible light emitted by the LED lamp panel is natural light, namely unpolarized light; polarization reflection means for receiving the visible light scattered by the extension means, allowing horizontally polarized light of the visible light to pass therethrough, and reflecting vertically polarized light; when the reflected vertical polarized light is incident to the expansion device, the polarized light is scattered and then becomes visible light, then the visible light penetrates through the lens array to be incident to the LED lamp panel, and the visible light is reflected back to the lens array through the LED lamp panel for recycling.

Optionally, the upper surface of the LED lamp panel is plated with a reflective film.

Optionally, the reflective film is a metal reflective film or a cut-off reflective film.

Optionally, the expansion device employs a diffusion membrane or plate.

Optionally, the polarizing reflective device is polarization selective to incident light,

has high transmittance for horizontally polarized light and simultaneously has high reflectance for vertically polarized light.

Optionally, the lower polarizer in the LCD assembly has polarization selectivity that allows horizontally polarized light to pass through.

Optionally, heat generated by absorption of light energy is reduced in the LCD assembly and power consumption of the LED lamp panel is reduced.

Alternatively, for TFT-LCD.

To achieve the above object, according to another aspect of the present application, there is provided a HUD.

The HUD according to the present application comprises: the backlight illumination device is provided.

Optionally, the HUD comprises: W-HUD or AR-HUD.

In this application embodiment backlight, HUD, adopt the LED lamp plate, lens array and LCD subassembly cooperation extension device, polarization reflecting device's mode has reached the light energy utilization ratio that improves lighting system through the perpendicular polarized light of reuse, reduces the purpose of LED consumption to realized, thereby reduced the technical effect of the heat increase of LCD absorption light energy production life, and then solved the technical problem that backlight is big, the temperature is high.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

FIG. 1 is a schematic structural diagram of a backlight illumination device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a backlight illumination device according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 and 2, a backlight illumination device according to an embodiment of the present application includes: LED lamp plate 1, lens array 2 and LCD subassembly 3 lens array 2 with between the LCD subassembly 3, still include: the expansion device 4 is used for scattering incident light which is emitted by the LED lamp panel 1 and passes through the lens array 2; the visible light emitted by the LED lamp panel 1 is natural light, i.e. unpolarized light; polarization reflection means 5 for receiving the visible light scattered by the extension means 4, allowing horizontally polarized light of the visible light to pass therethrough, and reflecting vertically polarized light; when the reflected vertical polarized light is incident to the expansion device 4, the polarized light is scattered and then becomes visible light, then the visible light penetrates through the lens array 2 to be incident on the LED lamp panel 1, and the visible light is reflected back to the lens array 2 through the LED lamp panel 1 for recycling.

Specifically, the visible light emitted by the LED lamp panel is natural light and unpolarized light. Then, the extension device 4 diffuses the incident light after the visible light emitted from the LED lamp panel 1 passes through the lens array 2. Then, the visible light scattered by the extension device 4 is received in the polarization reflection device 5, and the horizontally polarized light of the visible light is allowed to pass through the polarization reflection device 5, while the vertically polarized light is reflected. Finally, when being reflected back the vertical polarization light incides to behind the extension fixture 4, can with become visible light after the polarized light scattering, see through again lens array 2 incides to on the LED lamp plate 1, and pass through LED lamp plate 1 reflects back again lens array 2 carries out repeated a lot of and utilizes, has reduced when reducing LED lamp plate 1 power consumption the heat that absorption light energy produced among the LCD 3.

It should be noted that, because the lens array 2 and the extension device 4 have no selectivity to the polarization direction of light, the visible light emitted by the LED lamp panel 1, i.e. the natural light, is still natural light after passing through the lens array 2 and the extension device 4, i.e. the light incident into the polarized reflection device 5 is visible light.

It should be noted that natural light is generally understood as a collection of rays with different polarization directions, and the overall characteristic is unpolarized light. Specifically, for example, on the left side in fig. 1, the natural light emitted by the LED lamp panel is represented as horizontally polarized light and vertically polarized light, the sub-tables are represented by solid horizontal lines with double arrows and small circles, and the dotted lines with single arrows represent the propagation direction of the light, that is, the light emitted by the LED is emitted upward as shown in fig. 1.

From the above description, it can be seen that the following technical effects are achieved by the present application:

in the embodiment of the application, the backlight device, the backlight method for the HUD and the HUD adopt the LED lamp panel, the lens array and the LCD component are matched with the expansion device and the polarization reflection device, and the purpose of improving the light energy utilization rate of the illumination system and reducing the LED power consumption is achieved by repeatedly utilizing the vertical polarized light, so that the technical effect of prolonging the service life of the LCD by absorbing the heat generated by the light energy is reduced, and the technical problems of large power consumption and high temperature of the backlight device are solved.

According to the embodiment of the application, as shown in fig. 1, preferably, the upper surface of the LED lamp panel is plated with a reflective film.

Specifically, the upper surface of the LED lamp panel is plated with a reflective film, which may be a metal reflective film or a cut-off reflective film.

According to the embodiment of the present application, as a preferable example in the embodiment, as shown in fig. 1, the expansion means employs a diffusion film or a diffusion plate.

Specifically, the extension device diffuiser is a diffusion film or a diffusion plate. The diffusion film or plate scatters incident light, and serves to improve uniformity of the incident light.

According to the embodiment of the present application, as a preferable feature in the embodiment, as shown in fig. 1, the polarization reflection device 5 has polarization selectivity for incident light, high transmittance for horizontally polarized light, and high reflectance for vertically polarized light.

Specifically, the polarization reflection means 5 has polarization selectivity for incident light, high transmittance for horizontally polarized light, and high reflectance for vertically polarized light. Thus, the polarized reflecting means 5 allows horizontally polarized light to pass through, while almost totally reflecting vertically polarized light.

According to the embodiment of the present application, as shown in fig. 1, the lower polarizer in the LCD module 3 preferably has polarization selectivity, which allows horizontally polarized light to pass through.

The lower polarizer in the LCD module 3 has polarization selectivity, which allows horizontally polarized light to pass through, while vertically polarized light is totally absorbed by the lower polarizer and converted into heat, which causes the LCD temperature to rise. In embodiments of the present application, transmission of horizontally polarized light is reduced, thereby reducing the conversion of absorption into heat.

Preferably, the heat generated by the absorption of light energy is reduced in the LCD assembly 3 and the power consumption of the LED lamp panel is reduced.

In another embodiment of the present application, there is also provided a HUD including: the backlight illumination device is composed of an LED lamp panel, LEDs, an illumination lens array, a diffusion film Diffuser, a polarization reflection film RPM and an LCD. In addition, the upper surface of the LED lamp panel is plated with a reflecting film, and the reflecting film can be a metal reflecting film or a cut-off reflecting film. When visible light emitted from the LED lamp panel is collimated by the lighting lens array, the visible light enters the diffusion film or the diffusion plate diffuiser, and the incident light is scattered by the diffusion film or the diffusion plate, so that the uniformity of the incident light can be improved. Because the illumination lens array and the diffusion film have no selectivity to the polarization direction of light, the natural light emitted by the LED lamp panel is still natural light after passing through the illumination lens and the diffusion film, that is, the light incident to the RPM of the polarization reflection film is natural light. Since the polarizing reflective film RPM has polarization selectivity to incident light, it has high transmittance to horizontally polarized light, and simultaneously has high reflectance to vertically polarized light. Therefore, the polarizing reflective film RPM allows horizontally polarized light to pass therethrough, while almost totally reflecting vertically polarized light. When the reflected vertical polarized light is incident on the diffusion film, the diffusion film has a depolarization function, i.e. the polarized light is scattered and then becomes natural light. Therefore, the vertical polarized light becomes natural light after penetrating through the diffusion film, and then penetrates through the lens array to be incident on the LED lamp panel. Because the upper surface of the LED lamp panel is plated with the reflecting film, the incident light can be reflected back again. The reflected natural light is continuously recycled through the process.

Preferably, the HUD comprises: W-HUD or AR-HUD, and can better ensure that the emergent brightness required by the TFT-LCD reaches 10W-15W cd/m when the W-HUD or AR-HUD is arranged in front of the TFT-LCD display scheme²。

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A backlighting apparatus, comprising: LED lamp plate (1), lens array (2) and LCD subassembly (3) lens array (2) with between LCD subassembly (3), still include:

the expansion device (4) is used for scattering incident light which is emitted by the LED lamp panel (1) and passes through the lens array (2); the visible light emitted by the LED lamp panel (1) is natural light, namely unpolarized light;

polarization reflecting means (5) for receiving the visible light scattered by the spreading means (4) and allowing horizontally polarized light of the visible light to pass therethrough and reflecting vertically polarized light;

when the reflected vertical polarized light is incident to the expansion device (4), the polarized light is scattered and then becomes visible light, then the visible light penetrates through the lens array (2) to be incident to the LED lamp panel (1), and the visible light is reflected back to the lens array (2) through the LED lamp panel (1) for recycling.

2. The backlight illumination device as claimed in claim 1, wherein the upper surface of the LED lamp panel is coated with a reflective film.

3. The backlight illumination device according to claim 2, wherein the reflection film is a metal reflection film or a cut-off reflection film.

4. The backlight illumination device as claimed in claim 1, wherein the extension means employs a diffusion film or a diffusion plate.

5. The backlight illumination device of claim 1, wherein the polarization reflection means has polarization selectivity for incident light,

6. The backlight illumination device as claimed in claim 1, wherein the lower polarizer in the LCD assembly has polarization selectivity allowing horizontally polarized light to pass through.

7. The backlighting apparatus of claim 6, wherein heat generated by absorption of light energy is reduced and power consumption of the LED lamp panel is reduced in the LCD assembly.

8. The backlight illumination device of claim 1, used in a TFT-LCD.

9. A HUD, comprising: a backlighting apparatus as recited in any one of claims 1 to 8.

10. A HUD according to claim 9, comprising: W-HUD or AR-HUD.