CN110687741A

CN110687741A - Projector based on RGB Micro-LED

Info

Publication number: CN110687741A
Application number: CN201810721675.3A
Authority: CN
Inventors: 孙雷; 张洪波; 张婧姣
Original assignee: Langfang Guangtong Electronic Equipment Co Ltd
Current assignee: Langfang Guangtong Electronic Equipment Co Ltd
Priority date: 2018-07-04
Filing date: 2018-07-04
Publication date: 2020-01-14

Abstract

The invention discloses a projector based on RGB Micro-LEDs, which comprises red, green and blue (RGB) Micro-LEDs, a projection system and a screen. Micro-LED is a Micro display chip and its various packaged products, which integrate high density Micro-size LED array on the chip, and ensure that each LED pixel can be addressed and driven to light up individually. And controlling the brightness of each pixel of the RGB Micro-LED, and obtaining a required projection pattern on a screen through the projection system. Compared with the traditional LED projector, the LED projector has no complex and expensive DMD or Lcos imaging device, chip passive illumination type projection is changed into chip active light emitting type projection, and meanwhile, the light source system, the size and the power consumption are reduced.

Description

Projector based on RGB Micro-LED

Technical Field

The invention relates to a projector, in particular to an RGB Micro-LED-based projector.

Background

With the development of the projection industry and the progress of the projection technology, the market of the projector is rapidly expanded, and the projector is gradually applied to daily life as large as a projector used in a large meeting room and as small as a pocket-type micro projector. Conventional LED projectors use LED illumination systems and require complex and expensive DMD or Lcos imaging devices to obtain the desired projected image. In patent application No. 201611161483.9, a DLP projector employs an LED as a light source and a DMD as an imaging element. In the patent with application number 200920057539.5, a projector adopts a red light LED, a green light LED and a blue light LED which are converged by a beam splitter prism and then emitted, Lcos is used as an imaging element, and because Lcos needs polarized light, a polarizer is added to an optical system of the projector.

Conventional projectors all include a light source-collimating system-imaging device (DMD/LCOS) -lens-screen-like structure, and the imaging device is a passive light-emitting element which does not emit light by itself. The traditional projector has the problems of complex structure, high energy consumption, large volume, short service life of a light source and high price.

Disclosure of Invention

The LED projector aims at solving the problems that the traditional LED projector based on a DMD or Lcos imaging device is complex in structure, high in energy consumption, large in size, short in service life of a light source and high in price.

The projector structure of the invention is composed of an imaging device (RGB Micro-LED) -a lens-a screen, wherein the imaging device integrates the functions of a light source, a collimation system and the imaging device of the traditional projector, and the imaging device is evolved into an active light-emitting element from a passive light-emitting element and can form a specified pattern through computer control.

The invention provides a projector based on RGB Micro-LED, which comprises an RGB Micro-LED (1), a projection system (2) and a screen (3); the brightness of each pixel of the RGB Micro-LED (1) is controlled, a required projection graph can be obtained on the screen (3) through the projection system (2), one or more reflectors, prisms, lenses and Micro-lens arrays can be added to any position on the light path of the projector, and the change or modification of the light path is still the same as the structure disclosed by the patent of the invention.

The Micro-LED is a high-density Micro-size LED array integrated on a chip, the array simultaneously comprises LED pixels of three colors of red (R), green (G) and blue (B), each LED pixel is enabled to be addressable, and the Micro-LED array can independently drive a Micro display chip which is lighted and various packaging products thereof.

The wavelength of a red light Micro-LED in the RGB Micro-LED (1) is 630 ~ 780nm, the wavelength of a green light Micro-LED is 495 ~ 630nm, the wavelength of a blue light Micro-LED is 420 ~ 505nm, the pixel size of each LED is that the length is larger than or equal to 1 mu M, the width is larger than or equal to 1 mu M, the line number M of the LED array is larger than or equal to 2, the column number N is larger than or equal to 2, and the divergence angle of each pixel of the Micro-LED (1) is matched with the numerical aperture of the projection system (2).

The projection system (2) is a system composed of lens groups and used for enlarging the size of a projection pixel so as to enable the pixel size of the Micro-LED to meet the actual projection requirement.

The screen (3) is used for displaying projection graphics.

The projector based on the RGB Micro-LED provided by the invention has the following main advantages and positive effects: by controlling the brightness of each pixel of the RGB Micro-LED, a required projection pattern can be obtained on the screen. The projector of the invention can reduce the volume of the existing projector by more than 50 percent due to the reduction of light sources and collimation systems. The imaging device is changed from passive light emitting to active light emitting elements, so that the luminous efficiency of the system can be improved, and the energy consumption can be reduced. Meanwhile, because the electric power required by the active light-emitting element is lower than that required by the passive light-emitting element for forming the same pattern, for example, when the passive light-emitting element is to form the pattern of one pixel, the light source is required to simultaneously illuminate all the pixels and turn off all the pixels except for the one pixel, and the active light-emitting element can only supply power to a single pixel, and the rest pixels are not supplied with power, so that the projector can further reduce the energy consumption. The projector of the invention can further reduce the cost and provide possibility for the miniaturization of the projection system due to the reduction of the light source and the collimation system. In the future, the micro-projection function is expected to be integrated on portable equipment such as a mobile phone and the like, the position of a flash lamp of the current mobile phone can be replaced, and the functions of the flash lamp and the micro-projection are directly considered.

Drawings

To further illustrate the technical content of the present invention, the following detailed description is provided in conjunction with the embodiments and the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.

Referring to fig. 1, the present invention provides an RGB Micro-LED based projector, including:

the RGB Micro-LED is a high-density Micro-size LED array integrated on a chip, which simultaneously contains LED pixels of three colors of red (R), green (G) and blue (B), and ensures that each LED pixel can be addressed and independently drives a Micro-display chip or screen and various packaging products thereof which are lighted.

The wavelength of a red light Micro-LED in the RGB Micro-LED (1) is 630 ~ 780nm, the wavelength of a green light Micro-LED is 495 ~ 630nm, the wavelength of a blue light Micro-LED is 420 ~ 505nm, the pixel size of each LED is that the length is larger than or equal to 1 mu M, the width is larger than or equal to 1 mu M, the row number M of the LED array is larger than or equal to 2, the column number N is larger than or equal to 2, and the divergence angle of each pixel of the Micro-LED (1) is matched with the numerical aperture of the projection system (2).

The projection system (2) is a system consisting of a lens group for enlarging the projection pixel size in order to make the Micro-LED pixel size meet the actual projection requirements.

-a screen (3) for displaying the projected graphics.

The projector of the invention can add one or more reflectors, prisms, lenses and micro-lens arrays at any position on the light path, and the change or modification of the light path is still the same as the structure of the invention.

The projector of the invention can reduce the volume of the existing projector by more than 50 percent due to the reduction of light sources and collimation systems. The imaging device is changed from passive light emitting to active light emitting elements, so that the luminous efficiency of the system can be improved, and the energy consumption can be reduced. Meanwhile, because the electric power required by the active light-emitting element is lower than that required by the passive light-emitting element for forming the same pattern, for example, when the passive light-emitting element is to form the pattern of one pixel, the light source is required to simultaneously illuminate all the pixels and turn off all the pixels except for the one pixel, and the active light-emitting element can only supply power to a single pixel, and the rest pixels are not supplied with power, so that the projector can further reduce the energy consumption. The projector of the invention can further reduce the cost and provide possibility for the miniaturization of the projection system due to the reduction of the light source and the collimation system. In the future, the micro-projection function is expected to be integrated on portable equipment such as a mobile phone and the like, the position of a flash lamp of the current mobile phone can be replaced, and the functions of the flash lamp and the micro-projection are directly considered.

The above-mentioned embodiments are further described in detail for the purpose of illustrating the invention, and it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A projector based on RGB Micro-LED is characterized by comprising an RGB Micro-LED (1), a projection system (2) and a screen (3); the brightness of each pixel of the RGB Micro-LED (1) is controlled, a required projection graph can be obtained on the screen (3) through the projection system (2), one or more reflectors, prisms, lenses and Micro-lens arrays can be added to any position on the light path of the projector, and the change or modification of the light path is still the same as the structure disclosed by the patent of the invention.

2. A RGB Micro-LED based projector as in claim 1, wherein the rgbmo-LED is a chip integrated high density Micro-sized LED array that contains three colors of red (R), green (G) and blue (B) LED pixels and ensures that each LED pixel is addressable and individually drives a Micro-display chip or screen and its various packaged products that are lit.

3. The RGB Micro-LED-based projector according to claim 1, wherein the wavelength of a red light Micro-LED in the RGBmicro-LED (1) is 630 86780 nm, the wavelength of a green light Micro-LED is 495 ~ nm, the wavelength of a blue light Micro-LED is 420 ~ nm, the pixel size of each LED is larger than or equal to 1 μ M in length, larger than or equal to 1 μ M in width, the number of rows M of the LED array is larger than or equal to 2, the number of columns N is larger than or equal to 2, and the divergence angle of each pixel of the Micro-LED (1) is matched with the numerical aperture of the projection system (2).

4. An RGB Micro-LED based projector as claimed in claim 1, wherein the projection system (2) is a system of lens sets for enlarging the projected pixel size in order to make the Micro-LED pixel size meet the actual projection requirements.

5. An RGB Micro-LED based projector as claimed in claim 1, characterised in that the screen (3) is used for displaying projected graphics.