CN204358586U - A kind of novel new line display instrument and light-source system thereof - Google Patents

Abstract

In order to solve the problems of low utilization rate, poor uniformity and complex structure of the light source system in the existing head-up display, the utility model provides a new type of light source system with simple structure, high utilization rate and good uniformity. A head-up display and its light source system. The light source system includes a number of backlights distributed in an array and correspondingly arranged in a number of light-gathering components distributed in an array; wherein, the light-gathering component is in the shape of a bowl, including an incident light surface, an exit light surface, and a and the total reflection surface between the outgoing light surface; the center of the incident light surface is provided with a concave hole that is sunken to the outgoing light surface, and the bottom of the concave hole is provided with a converging surface; the backlight is arranged on the at the center of the incident light plane. The light source system provided by the embodiment of the utility model has more uniform outgoing light, and at the same time, also significantly improves the light utilization rate of the head-up display. Its structure is also relatively simple, and the cost is low.

Description

A new type of head-up display and its light source system

technical field

The utility model relates to the field of automobiles, in particular to the field of head-up displays on automobiles.

Background technique

The head-up display (English abbreviation: HUD, English full name: Head Up Display) currently installed on the car. The transmissive display screen is mainly used. The light emitted from the backlight in the light source system passes through the transmissive LCD screen and is reflected by subsequent optical components and the front windshield of the car. The light loss rate is over 99%. In the optical path system, improving the mirror, front windshield or liquid crystal display is not effective in reducing light loss, and has relatively large limitations.

In order to improve the light utilization rate of the liquid crystal display screen, there are three commonly used methods at present: the first is to shorten the distance between the light source system and the display screen, so that almost all the light from the light source can reach the display screen. The obvious disadvantage of this method is that the uniformity is very poor, and when the backlight exceeds a certain brightness, a black hole appears in the middle of the display due to excessive temperature. The second method is to paste a plano-convex lens in front of each backlight, and add a reflective film on the shell from the backlight to the LCD screen. This method has a simpler structure and lower manufacturing cost, and makes the illuminance of the LCD screen larger. However, this method cannot gather the light emission angle. After the light is reflected by the reflective film, the angle between the main axis and the main axis is large, and the light emission angle is generally more than 50°. Most of this light is lost after passing through the reflector and the front windshield, and cannot reach people. Eye, which means that the overall utilization rate of light will be reduced, which has little effect on improving the light utilization rate of the entire optical path system. The third method is to encircle each backlight with a slender tube coated with a reflective film on the inner wall, and then add a light-condensing and light-uniform lens above the tube. The light is specularly reflected many times in the tube coated with reflective film, and the exit angle of the light is reduced. Small uniform beam. This method makes the light irradiated on the liquid crystal display frequency close to collimated light, which can improve the light utilization rate of the whole system, but the light undergoes multiple mirror reflections in the tube, resulting in large losses, low utilization rate, and complex structure. Manufacturing high cost. the

Utility model content

In order to solve the problems of low utilization rate, poor uniformity and complex structure of the light source system in the existing head-up display, the utility model provides a new type of light source system with simple structure, high utilization rate and good uniformity. A head-up display and its light source system.

On the one hand, the utility model provides a new type of light source system for a head-up display, which includes a number of array-distributed backlights and correspondingly arranged array-distributed light-gathering components;

Wherein, the light concentrating part is bowl-shaped, including an incident light surface, an exit light surface, and a total reflection surface arranged between the incident light surface and the exit light surface;

The incident light surface and the outgoing light surface are planes; the center of the incident light surface is provided with a concave hole that is sunken to the outgoing light surface, and the bottom of the concave hole is provided with a converging surface;

The backlight is arranged at the center of the incident light surface; both the converging surface and the total reflection surface are quadric surfaces formed by the rotation of a quadratic curve;

Part of the light emitted by the backlight is converged by the converging surface in the concave hole and then emitted from the outgoing light surface, and part of the light is emitted from the outgoing light surface after being reflected by the total reflection surface;

The distance between the incident light surface and the outgoing light surface is 4-7mm.

Preferably, the backlights are distributed in an array on a backlight board.

Preferably, the converging surface and the total reflection surface are one of a conical surface, an elliptical conical surface, a spherical surface, an ellipsoidal surface, and an elliptical paraboloid.

Preferably, the converging surface is a spherical surface, and the total reflection surface is one of a conical surface, an elliptical conical surface, an ellipsoid or an elliptical paraboloid.

Preferably, the plurality of light concentrating components arranged in an array are fixed on a light concentrating substrate.

Preferably, the light concentrating component is integrally formed with the light concentrating substrate.

Preferably, the backlight plate is provided with a fixing groove, and the light concentrating substrate is installed in the fixing groove;

Or the light-incident surface of the light-collecting component is glued to the backlight plate.

Preferably, the material of the light concentrating component is one of PMMA, PC or COC.

The light source system used in the embodiment of the utility model includes array-distributed backlights and light-concentrating parts that are arranged correspondingly. A total reflection surface is set between the incident light surfaces, and a concave hole is set on the incident light surface, and a converging surface is set in the concave hole, so that the light with a small exit angle on the backlight will be concentrated by the converging surface, and the exit angle Larger light rays will be collected and homogenized after being totally reflected by the total reflection surface, and the outgoing angle (the angle between the outgoing light and the main optical axis) of the light collected by the light-collecting part is less than 15°. At the same time, researchers When analyzing the surface illuminance of the transmissive display screen, the test results show that the outgoing light is more uniform, and at the same time, the light utilization rate of the head-up display is also significantly improved, and the light utilization rate of the light source system is as high as 85%. Its structure is also relatively simple, and the cost is low.

The second aspect of the utility model provides a new head-up display, including a light source system and a transmissive display screen; the light source system is located below the transmissive display screen, wherein the light source system is provided by the first aspect The light source system.

The new head-up display device disclosed in the embodiment of the utility model includes the above-mentioned light source system, so the light emitted by the head-up display device is more uniform, and the light utilization rate is higher. Its structure is also relatively simple, and the cost is low.

Description of drawings

Fig. 1 is the original path diagram of the optical path of the head-up display provided in the specific embodiment of the present invention;

Fig. 2 is a schematic diagram of the light source system provided in the specific embodiment of the utility model;

Fig. 3 is a schematic cross-sectional view of a light-gathering component provided in a specific embodiment of the present invention;

Fig. 4 is a three-dimensional schematic diagram of the light-gathering component provided in the specific embodiment of the present invention;

Among them, 1. Concentrating component; 2. Concentrating substrate; 3. Transmissive display; 4. Backlight; 11. Exiting light surface; 12. Incident light surface; 13. Concave hole; 14. Total reflection surface; 15. Convergence surface; 16, cylinder.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Example 1

This example will specifically explain the light source system of the new head-up display provided by the utility model, as shown in Figure 1 and Figure 2, which includes a number of array-distributed backlights 4 and correspondingly arranged array-distributed spotlights component 1;

As shown in Fig. 3 and Fig. 4, the light concentrating member 1 is bowl-shaped, including an incident light surface 12, an exit light surface 11, and a total reflection surface 14 arranged between the incident light surface 12 and the exit light surface 11 ;

The incident light surface 12 and the outgoing light surface 11 are planes; the center of the incident light surface 12 is provided with a concave hole 13 that is recessed toward the outgoing light surface 11, and the bottom of the concave hole 13 is provided with a converging surface 15 ;

Wherein, the backlight lamps 4 are distributed in an array on a backlight panel (not shown in the figure). The backlight 4 is a light source, generally an LED lamp (full name in Chinese: Light Emitting Diode, full name in English: Light Emitting Diode) or a cold cathode fluorescent lamp (full name in English: Cold Cathode Fluorescent Lamp, abbreviation: CCFL). The backlight is made of glass fiber or ceramics.

The backlight 4 is arranged at the center of the incident light surface 12; the converging surface 15 and the total reflection surface 14 are quadratic surfaces formed by the rotation of a quadratic curve; the quadratic curve (or conic curve) ) can be a circle, ellipse, hyperbola, parabola, etc. Under the Cartesian coordinate system (x, y) on the section, the equations of these curves are binary quadratic equations of x, y: . Wherein, the so-called quadratic surface is one of the converging surface and the total reflection surface being a conical surface, an elliptical conical surface, a spherical surface, an ellipsoidal surface, and an elliptical paraboloid.

Wherein, above-mentioned converging surface 15 and total reflection surface 14 are preferably all a kind of in conical surface, elliptic conical surface, spherical surface, ellipsoid, elliptic paraboloid, but because quadratic surface manufacturing cost is high, and converging surface 15 is arranged on concave In the hole 13, it is more difficult to manufacture. Therefore, in consideration of cost reduction, the converging surface 15 can also be made into a spherical surface, because the manufacturing cost of the spherical surface is low. Preferably, the converging surface 15 is a spherical surface, and the total reflection surface 14 is one of a conical surface, an elliptical conical surface, an ellipsoidal surface or an elliptical paraboloid. Although the effect of the spherical surface is poor, the cost is low, and those skilled in the art can measure it according to the cost and light utilization rate. During the research and development process, the researchers found that the converging surface 15 and the total reflection surface 14 are all made of conical surface, elliptical conical surface, ellipsoidal surface, and elliptical paraboloid, and the light utilization rate of the light source system is 85%, even if the converging surface is reduced. It is required to use a spherical surface, and the total reflection surface adopts one of conical surface, elliptical conical surface, ellipsoidal surface, and elliptical paraboloid. The light utilization rate of the light source system is also as high as 82%.

Wherein, the so-called backlight 4 is arranged at the center of the incident light surface 12 means that the light-emitting surface of the backlight 4 is in the same plane as the incident light surface, and at the same time, the light-emitting surface of the backlight 4 is in the same plane as the concave hole 13. The centers coincide. The luminous angle of the backlight 4 (the luminous angle is the angle included by light with a luminous intensity of 50%) is generally within 60-180°. Such as 120°.

Part of the light (mostly) emitted by the backlight 4 is reflected by the total reflection surface 14 and emerges from the light emitting surface 11, and part of the light is converged by the converging surface 14 in the concave hole 13 and then emerges from the light emitting surface 11 exits, used to reinforce the central light intensity. In this way, the light emitted by each backlight 4 is collected and homogenized in the corresponding light-condensing component 1 respectively, and the beam emission angle (the angle between the outgoing light and the main optical axis) of the light-concentrating component is less than 15 °, so that uniform light is received on the transmissive display screen 3 .

The size of the light-condensing component 1 is not particularly limited, and technical personnel can make specific settings according to the size of the backlight 4 and requirements for light-condensing effect and uniformity. The following is just an example. In this example, the diameter of the light incident surface 12 is about 2.5-2.6 mm, such as 2.58 mm; the diameter of the light exit surface 11 is about 8-10 mm, such as 8 mm. The distance between the incident light surface 12 and the outgoing light surface 11 is about 4-7mm, such as 4.8mm. Wherein, as shown in FIG. 3 and FIG. 4 , a cylindrical surface 16 is connected between the total reflection surface 14 and the light emitting surface 11 in this example, and the height of the cylindrical surface 16 is 0.2-2 mm, such as 0.5 mm.

The size of the above-mentioned concave hole 13 is adapted to the backlight 4, which is equivalent to or slightly larger than the backlight 4. For example, the size of the backlight 4 is 1×1mm, (please add the size of the backlight here ) The diameter of the concave hole 13 is about 1.8-2.5mm; in this example, it is set to 2mm; the depth of the concave hole 13 is about 1.5-3mm, specifically 1.83mm in this example.

As for the installation method of the light-concentrating components 1 , they can be directly installed on the backlight board, and each light-concentrating component 1 is covered on the corresponding backlight 4 ; and fixed by gluing or clamping. Alternatively, as a preferred implementation manner, the plurality of light concentrating components 1 distributed in an array are fixed on a light concentrating substrate 2 . The light concentrating component 1 can be fixed on the light concentrating substrate 2 by gluing or other means, or can be integrally formed with the light concentrating substrate 2 , preferably in an integral form. On the one hand, the light concentrating substrate 2 can be used as a base for installing the light concentrating component 1, and at the same time, it can also be used as a heat shield to reduce the heat transfer between the backlight 4 and the transmissive display screen 3, and has a certain heat insulation. The function is to keep the temperature of the transmissive display screen 3 within the working range and prevent unnecessary influence on the transmissive display screen 3 .

Regarding the fixing method of the light concentrating substrate 2, since a housing is often installed between the backlight panel and the transmissive display screen 3, a light-through hole is formed in the housing, and the light emitted by the backlight lamp 4 on the backlight plate passes through the light-through hole. The hole shoots to the transmissive display screen 3 . Therefore, the light concentrating substrate 2 can be fixedly installed in the housing.

Alternatively, a fixing groove may be provided on the backlight plate, and the light concentrating substrate 2 is installed in the fixing groove. Alternatively, the incident light surface 12 of the light concentrating component 1 may be glued on the backlight plate simultaneously or separately.

Wherein, the material of the light concentrating part 1 is PMMA (scientific name is polymethyl methacrylate, commonly known as acrylic or plexiglass), PC (scientific name is polycarbonate, English full name: Polycarbonate) or COC (cycloolefin copolymer) One of. It is preferably made of PMMA.

The light source system used in the embodiment of the present utility model, because it includes the array-distributed backlight 4 and the concentrating part 1 that are arranged correspondingly, the concentrating part 1 is bowl-shaped, including the incident light surface 12, the exit light surface 11 and the A total reflection surface 14 arranged between the incident light surface 12 and the outgoing light surface 11, and a concave hole 13 is set on the incident light surface 12, and a converging surface 15 is arranged in the concave hole 13, so that the backlight 4 with a small exit angle The light will be concentrated by the converging surface 15, and the light with a large exit angle will be collected and homogenized after being totally reflected by the total reflection surface 14. main optical axis angle) is less than 15°. At the same time, when the researchers analyzed the surface illuminance of the transmissive display 3, the test results showed that the outgoing light was more uniform, and at the same time, the light utilization rate of the head-up display was also significantly improved. , taking the light emitting angle of the backlight 4 as an example of 120°, the light utilization rate of the light source system is as high as 85%. Its structure is also relatively simple, and the cost is low.

Example 2

This example provides a new type of head-up display, as shown in Figure 1, including a light source system and a transmissive display screen 3; the light source system is located below the transmissive display screen 3, wherein the light source system is the above-mentioned The light source system described in Example 1 is provided.

Regarding the transmissive display 3, it can be a transmissive liquid crystal display or other display devices (such as transflective LCOS (Chinese full name: silicon chip liquid crystal, English full name: liquid-crystal-on-silicon) display , reflective DLP (English full name: Digital Light Processing, Chinese full name: Digital Light Processing) display).

As for the head-up display, it generally also includes the above-mentioned housing on which the above-mentioned light source system and the transmissive display screen are installed, which may include other optical paths or components. Regarding the above-mentioned housing, other optical paths or components, methods known to those skilled in the art can be used. In this example, only the light source system is improved, and the light source system has been explained in detail in Embodiment 1, so details are not repeated here.

The new head-up display device disclosed in the embodiment of the utility model includes the above-mentioned light source system, so the light emitted by the head-up display device is more uniform, and the light utilization rate is higher. Its structure is also relatively simple, and the cost is low.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (9)

1. a light-source system for novel new line display instrument, is characterized in that, comprises some backlights in array distribution and the corresponding some light concentrating components in array distribution arranged;

Wherein, described light concentrating components is bowl-type, the fully reflecting surface comprising incident light plane, emergent light face and be arranged between described incident light plane and emergent light face;

Described incident light plane and emergent light face are plane; The center of described incident light plane is provided with the shrinkage pool to described emergent light face depression, and the bottom of described shrinkage pool is provided with convergence face;

Described backlight is arranged on the center of described incident light plane; Described convergence face and described fully reflecting surface are conic section and rotate the quadratic surface formed;

The light portion that described backlight sends after the convergence face in this shrinkage pool is converged from described emergent light face outgoing, some light after the reflection of described fully reflecting surface from described emergent light face outgoing;

Distance between described incident light plane to emergent light face is 4-7mm.

2. light-source system according to claim 1, is characterized in that, described backlight is that array distribution is in a backlight.

3. light-source system according to claim 2, is characterized in that, described convergence face, fully reflecting surface are the one in taper seat, elliptic cone, sphere, ellipsoid, paraboloid.

4. light-source system according to claim 3, is characterized in that, described convergence face is sphere, and described fully reflecting surface is the one in taper seat, elliptic cone, ellipsoid or paraboloid.

5. according to the light-source system in claim 3-4 described in any one, it is characterized in that, described some light concentrating components in array distribution are fixed on a converging substrate.

6. light-source system according to claim 5, is characterized in that, described light concentrating components and described converging substrate one-body molded.

7. light-source system according to claim 6, is characterized in that, described backlight is provided with holddown groove, and described converging substrate is arranged in described holddown groove;

Or the incident light plane of described light concentrating components is adhesive in described backlight.

8. light-source system according to claim 1, is characterized in that, the material of described light concentrating components is the one of PMMA, PC or COC.

9. the novel new line display instrument of one according to claim 1, comprises light-source system and transmission display panel; Described light-source system is positioned at below described transmission display panel, it is characterized in that, described light-source system is the light-source system in claim 1-8 described in any one.