CN202351607U - High-brightness light emitting diode (LED) illumination light-equalizing system - Google Patents

Abstract

The utility model discloses a high-brightness LED lighting even light system, which comprises a high-brightness LED module, an LED light-emitting chip is arranged on the high-brightness LED module, and a light-even light chip is arranged directly in front of the LED light-emitting chip. Rod, a color wheel is arranged directly in front of the homogenizing rod, and the homogenizing rod includes a tapered structure part, the size of the incident end of the tapered structure part is smaller than the size of the outgoing end, and the tapered structure part The exit end face is a rectangular structure, the aspect ratio of the rectangular structure is 4:3 or 16:9, and the floating range is within 10%. The lighting homogenization system of the utility model can not only greatly improve the energy collection efficiency of the LED light source, and improve the uniformity of the outgoing light, but also change the shape of the outgoing light spot according to the needs of projection lighting, reduce the volume of the coupling device, and is suitable for projection field, especially the requirements for the brightness and volume of the lighting source in the field of micro-projection.

Description

A high-brightness LED lighting uniform light system

technical field

The utility model belongs to the field of projection, especially the field of micro-projection, and in particular relates to an illumination homogenization system for improving the uniformity of emitted light from an LED light source and changing the shape of the emitted light spot.

Background technique

The projection system is a technology that projects information such as moving images or still pictures onto a screen to display specific information to people. With the advent of the information society, projection display technology has entered an era of diversity. In recent years, micro-projectors have been widely used in the field of business projection due to their portability and dexterity. With the emergence of chips, mobile phone projection technology is also rapidly rising.

At present, in order to reduce energy consumption, improve safety, and adapt to the development trend of miniaturization in the field of projection, especially in the field of micro-projection, LED light sources, especially surface-emitting high-brightness LED light sources, are gradually replacing traditional halogen lamps and xenon lamps. Light sources with high energy consumption and short life have been widely used. High-brightness LED light source has the advantages of short start-up time, high brightness, low energy consumption, small size, long life, and high safety, and can overcome many bottlenecks in the development of the current projection field. Compared with luminescence, gas discharge luminescence has many different characteristics, concentrated in the aspects of low energy collection efficiency and poor light uniformity.

In the traditional liquid crystal projection display system, Kohler lighting is often used as a lighting method, and its working principle is shown in Figure 1. The light source is imaged on the field diaphragm of the lighting system through the front group of the condenser; the front group of the condenser is imaged on the LCD panel through the rear group of the condenser, and the field diaphragm of the lighting system is also imaged at infinity. In Kohler lighting, the front group of condensers is called Kohler mirror, which obtains the uniform illumination of the light source, and is imaged on the LCD panel after being assembled by the condenser lens, so that the LCD panel is evenly illuminated.

The double-row fly-eye lens lighting structure is also commonly used to provide uniform lighting for projection. As shown in Figure 2, the fly-eye lighting system usually contains two rows of fly-eye lenses. Each row of fly-eye lenses is composed of a series of small lenses. The light emitted by the light source passes through the Double rows of fly-eye lenses and integrating lenses form uniform illumination on the LCD panel.

The single-chip DLP projection display system usually uses a light source with an ellipsoidal reflective bowl and a square rod lighting system. The light emitted by the light source is focused and incident on the incident end of the square rod. The emitting end forms a uniform rectangular distribution, and then the emitting end of the square rod is imaged on the surface of the DMD by the illumination lens group to form a suitable illumination area. After the illumination light is modulated and reflected by the DMD, it is imaged on the screen through the projection objective lens. Its principle is shown in Figure 3.

The above-mentioned traditional projection lighting systems all use condenser lens groups for light coupling and uniform illumination. This method uses a lens group composed of multiple lenses, which greatly increases the cost, and the volume is relatively large, which is difficult to meet the miniaturization of the instrument. requirements.

Utility model content

In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide a high-brightness LED lighting homogenization system, which can not only effectively improve the light energy extraction efficiency of the LED light source, but also improve the uniformity of illuminance. And make the outgoing light spot meet the requirements of the projection field for the shape of the light spot.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the utility model adopts the following technical solutions:

A high-brightness LED lighting uniform light system, which includes a high-brightness LED module, an LED light-emitting chip is arranged on the high-brightness LED module, and a light uniform rod is arranged directly in front of the LED light-emitting chip. A color wheel is arranged directly in front of the uniform light rod, and the uniform light rod includes a tapered structure part, the size of the incident end of the tapered structure part is smaller than the size of the exit end, and the size of the tapered structure part is close to the light source The size is optimal, the exit end face is a rectangular structure, the aspect ratio of the rectangular structure is 4:3 or 16:9, and the floating range is within 10%.

Further, the homogenizing rod further includes a rectangular structure part, the rectangular structure part is located at the incident end or the exit end of the tapered structure part, and is integrally connected.

Preferably, the uniform light rod is bonded to the surface of the LED light-emitting chip 2 through silica gel.

Further, a protective window is arranged directly in front of the LED light-emitting chip, and the light uniforming rod is bonded to the protective window through silica gel.

Preferably, the dodging rod is fixed on the high-brightness LED module through a positioning plate.

Preferably, the dodging rod is a solid structure, the solid structure is glass with high transmittance in the visible light band, and a broadband high-reflection film is provided at the contact between the positioning plate and the dodging rod.

Preferably, the light dodging rod is a hollow structure, the inner surface of the hollow structure is coated with a layer of broadband high reflection film, the positioning plate is a rectangular structure, and the light dodging rod is located in the rectangular cavity of the positioning plate Inside.

The working principle of the utility model is as follows:

The high-brightness LED lighting uniform light system of the utility model includes a high-brightness LED module, a light uniform rod and a color wheel, wherein a surface-emitting light source composed of a patch-type LED light-emitting chip is arranged on the high-brightness LED module. The emitted light is mainly concentrated in the angle range of 120o, and at the same time, there is energy distribution in the range of more than 120o angle, so the uniformity of illumination is very poor, which cannot meet the requirements of projection lighting, but the setting of the uniform light bar can effectively Extract the light energy of high-brightness LED light source, improve energy coupling efficiency and reduce light loss.

The area of the entrance of the light uniform rod is smaller than the area of the exit port, and the light emitted from the LED light-emitting surface passes through the light uniform rod, and the light emission angle is compressed. The smaller the area ratio of the entrance port and the exit port, the more obvious the angle compression effect , the better the beam collimation. Considering the two factors of angular coupling efficiency and area coupling efficiency, the optimal energy coupling efficiency can be achieved by choosing a reasonable ratio of the area of the entrance to the exit. By rationally designing the size of the exit end of the uniform rod, the rectangular aspect ratio of the exit end of the uniform rod is formed to be close to or equal to 4:3 or 16:9, so the exit spot can also meet the current requirements for the size of the illumination spot in the projection field.

Compared with the prior art, the utility model has the following beneficial effects:

In the utility model, the high-brightness LED light source composed of patch-type LED light-emitting chips arranged in an array is not high in luminous uniformity, but after passing through the uniform light rod, the light is reflected in the uniform light rod for many times, which plays a role in mixing light. The uniformity of the outgoing light is significantly improved, and the uniform light effect of the traditional Kohler lighting or fly-eye lens lighting is realized, and the volume is greatly reduced compared with the former two.

The light emitted from the illumination uniform light system of the present invention can pass through collimating lens, projection chip, TIR prism, projection lens, and finally project information onto the screen. The lighting uniform light system can not only greatly improve the energy collection efficiency of the LED light source, improve the uniformity of the outgoing light, but also change the shape of the outgoing light spot according to the needs of projection lighting, reduce the volume of the coupling device, and is suitable for the projection field, especially Requirements for the brightness and volume of the lighting source in the field of micro-projection.

The above description is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with accompanying drawings. back.

Description of drawings

The drawings described here are used to provide a further understanding of the utility model and constitute a part of the application. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

FIG. 1 is a schematic structural diagram of a traditional Kohler lighting method.

Fig. 2 is a schematic structural diagram of a conventional fly-eye lens lighting method.

FIG. 3 is a schematic diagram of a single-chip projection display system using square rods.

Fig. 4 is a schematic structural diagram of an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of another embodiment of the present invention.

Fig. 6 is a schematic structural diagram of another embodiment of the present invention.

Fig. 7 is a schematic structural diagram of another embodiment of the present invention.

Fig. 8 is a schematic structural diagram of another embodiment of the present invention.

Explanation of symbols in the figure: 1. High-brightness LED module, 2. LED light-emitting chip, 3. Conical structure part, 4. Rectangular structure part, 5. Positioning plate, 6. Broadband high-reflection film, 7. Color wheel.

Detailed ways

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

Example 1:

As shown in Figure 4, a high-brightness LED lighting uniform light system is shown, which includes a high-brightness LED module 1, and an LED light-emitting chip 2 is arranged on the high-brightness LED module 1, and the LED light-emitting chip 2 is provided with a dodging rod directly in front of the dodging rod, and a color wheel 7 is arranged in front of the dodging rod, and the dodging rod includes a tapered structure part 3, and the size of the incident end of the tapered structure part 3 is smaller than The size of the outgoing end, the incident end face of the tapered structure part 3 is rectangular or other shapes, its size is preferably close to the size of the light source, the outgoing end face is a rectangular structure, and the aspect ratio of the rectangular structure is 4:3 or 16:9, within 10% of the floating range.

The homogenizing rod further includes a rectangular structure part 4, which is located at the incident end or the exit end of the tapered structure part 3 and is integrally connected.

The dodging rod is fixed on the high-brightness LED module 1 through a positioning plate 5 .

The dodging rod is a solid structure, the solid structure is glass with high transmittance in the visible light band, and a layer of broadband high-reflection film 6 is provided at the contact between the positioning plate 5 and the dodging rod.

The working principle of this embodiment is as follows:

The light emitted from the LED light-emitting chip 2 of the high-brightness LED module 1 is first coupled to the tapered structure part 3 of the uniform light rod. The material of the tapered structure part 3 is optical glass with high transmittance in the visible light range. The incident end surface is rectangular or other shapes, and its size is preferably close to the size of the light source. The size of the incident end of the tapered structure is smaller than the size of the outgoing end. The light is uniformly mixed and has a compression effect on the light angle. The compressed light enters the rectangular structure part 4 of the dodging rod. The tapered structure part 3 and the rectangular structure part 4 of the dodging rod use the same material. The main function of the structure part 4 is to realize the aspect ratio of the exit spot is close to or equal to 4:3 (or 16:9), so as to match the chip size in the subsequent system. At the same time, the rectangular structure part 4 provides a convenience for the uniform light The fixed surface of the positioning plate 5 is coated with a broadband high-reflection film 6 in the visible light band. The role of the broadband high-reflection film 6 is to prevent light leakage from the part where the positioning plate 5 is in contact with the uniform light rod. The color wheel 7 is a part of the projection system. The light splitting device is in close contact with the exit surface of the homogenizing rod, and the light emitted from the color wheel 7 passes through a collimating lens, a projection chip, a projection lens, etc., and finally realizes a projection display.

Example 2:

As shown in Figure 5, it shows a high-brightness LED lighting uniform light system, wherein the main difference from Embodiment 1 is that the rectangular structure part 4 of the light uniform rod is in the direction close to the LED light-emitting chip 2, this structure and implementation Example 1 is essentially the same, and the energy coupling efficiency is equivalent. The main reason is that the positioning plate 5 of the uniform light rod is located close to the high-brightness LED module 1, and the clamping method of the fixture is changed.

Example 3:

As shown in Figure 6, it shows a high-brightness LED lighting homogenization system. The main difference from Embodiment 1 is that the structure of the homogenization rod has changed, which is only composed of a tapered structure part 3 and does not include a rectangular structure. part 4. The incident end face of the tapered structure part 3 is rectangular or other shapes, and its size is preferably close to the size of the light source, and the outgoing end face is a rectangular structure, and the aspect ratio of the rectangular structure is 4:3 or 16:9 (or approximately Proportion). This structure is essentially the same as Embodiment 1, and the energy coupling efficiency is equivalent, mainly because the rectangular structure part 4 of the dodging rod is omitted, and the clamping mode of the clamp is changed at the same time.

Example 4:

As shown in Fig. 7, a kind of high-brightness LED lighting dodging system is shown, the dodging rod of this structure is a hollow structure, and the inner surface of the hollow structure is coated with a layer of broadband high-reflection film 6, and the positioning The plate 5 has a rectangular structure, and the dodging rod is located in the rectangular cavity of the positioning plate 5 .

After the light is emitted from the LED light-emitting chip 2 of the high-brightness LED module 1, it is coupled to the uniform light rod, and the optical fiber is transmitted through the reflection of the broadband high-reflection film 6 in the light uniform rod, instead of the embodiment 1 and embodiment 1. In 2, the light is transmitted by total reflection in the homogenizing rod, the positioning plate 5 in this embodiment is made into a rectangular structure, and is clamped by a special clamp, and the dimensions of the incident end surface and the outgoing end surface of the homogenizing rod are the same as those in Embodiment 1 , the light emitted from the dodging rod is transmitted in the same manner as in Embodiment 1 and Embodiment 2.

Example 5:

As shown in Figure 8, it shows a high-brightness LED lighting homogenization system, in which the homogenization rod is a hollow structure. The main difference from Embodiment 4 is that the structure of the homogenization rod has changed, and it only has a tapered structure. Part 3 constitutes, does not include the rectangular structure part 4. The incident end face of the tapered structure part 3 is rectangular or other shapes, and its size is preferably close to the size of the light source, and the outgoing end face is a rectangular structure, and the aspect ratio of the rectangular structure is 4:3 or 16:9 (or approximately Proportion). This structure is essentially the same as Embodiment 4, and the energy coupling efficiency is equivalent. The main reason is that the rectangular structure part 4 of the dodging rod is omitted, and the clamping method of the fixture is changed. The fixture is glued to the high-brightness LED module.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (7)

1. photosystem is spared in a high-brightness LED illumination; It is characterized in that: comprise a high-brightness LED module (1), said high-brightness LED module (1) is provided with LED luminescence chip (2), and the dead ahead of said LED luminescence chip (2) is provided with by an optical tunnel; The dead ahead of said optical tunnel is provided with a colour wheel (7); Said optical tunnel comprises a pyramidal structure portion (3), and the size of the incident end of said pyramidal structure portion (3) is less than the size of its exit end, and the outgoing end face of said pyramidal structure portion (3) is a rectangular configuration; The length breadth ratio of said rectangular configuration is 4:3 or 16:9, in the domain of walker 10%.

2. the even photosystem of high-brightness LED illumination according to claim 1; It is characterized in that: said optical tunnel also comprises a rectangular configuration portion (4); Said rectangular configuration portion (4) is positioned at the incident end or the exit end of said pyramidal structure portion (3), and one connects.

3. the even photosystem of high-brightness LED illumination according to claim 1 and 2, it is characterized in that: said optical tunnel is bonded in the surface of said LED luminescence chip (2) through silica gel.

4. the even photosystem of high-brightness LED illumination according to claim 3 is characterized in that: the dead ahead of said LED luminescence chip (2) is provided with by a protection window, and said optical tunnel is bonded on the said protection window through silica gel.

5. the even photosystem of high-brightness LED illumination according to claim 1 and 2, it is characterized in that: said optical tunnel is fixed on the said high-brightness LED module (1) through a location-plate (5).

6. the even photosystem of high-brightness LED illumination according to claim 1 and 2; It is characterized in that: said optical tunnel is the solid construction body; Said solid construction body material is the glass of visible light wave range high permeability, and said location-plate (5) is provided with one deck broadband high-reflecting film (6) with said optical tunnel contact position.

7. the even photosystem of high-brightness LED illumination according to claim 1 and 2; It is characterized in that: said optical tunnel is the hollow-core construction body; The inside surface of said hollow-core construction body is coated with one deck broadband high-reflecting film (6); Said location-plate (5) is a rectangular configuration, and said optical tunnel is positioned at the rectangular cavity of said location-plate (5).

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