LCD projection ray machine with high color rendition degree

Abstract

The utility model discloses an LCD projection ray machine with high color rendition degree, comprising a light source connected to an MCU, the light source comprises a white light source W, and the light source also comprises a red light source, a green light source and a blue light source which are inserted among light emitting units of the white light source W; after the LCD projection ray machine is powered on, the white light source W is a normally-on light source; the red light source, the green light source and the blue light source are all connected with the white light source W in parallel, and the red light source, the green light source and the blue light source are all provided with independent control switches; the light intensity of the red light source, the green light source and the blue light source can be independently adjusted through the MCU. Red, blue and green light sources are added to the light source of the LCD projection light machine, the intensity of corresponding monochromatic light is enhanced by the light source through synthesis of the three-color light sources, and the color expression capability is higher. According to the LCD projection ray machine, through compensation of the monochromatic light source, the whole machine can correct color cast, so that a projection picture has higher color rendition degree.

Description

Technical Field

[0001] This utility model relates to projectors, and more specifically to an LCD projection optical engine with high color fidelity. Background Technology

[0002] The color performance capability of existing LCD projector optical engines is entirely limited by the characteristics of the screen itself. For example, if a screen has a color gamut of 50%, the final projection effect will be further reduced from 50% due to the light source spectrum and the differences in the reflectivity and transmittance of various optical components to different wavelengths. Generally, the color gamut is lower than 50%.

[0003] Another problem with LCD projectors is poor color reproduction. Color gamut is determined by hardware characteristics, and color accuracy is affected by both hardware characteristics and software parameters. Poor color gamut, coupled with the lack of compensation measures, means that software parameter adjustment relies entirely on suppressing the intensity of certain colors to achieve certain color and image quality requirements. This sacrifices a significant amount of brightness, which is a very important indicator in the projection industry, and a significant sacrifice of brightness is unacceptable.

[0004] In view of this, it is necessary to improve the traditional LCD projection optical engine. Utility Model Content

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an LCD projector optical engine with high color fidelity. The purpose of designing this LCD projector optical engine is to enable the projected image to have higher color fidelity.

[0006] To solve the above technical problems, the present invention achieves this through the following solution: The present invention provides a high color reproduction LCD projection optical engine, including a light source connected to an MCU, the light source including a white light source W, and the light source also including a red light source, a green light source and a blue light source interspersed between the light-emitting units of the white light source W;

[0007] After the LCD projection optical engine is powered on, the white light source W is a constantly lit light source;

[0008] The red light source, green light source, and blue light source are all connected in parallel with the white light source W, and each of the red light source, green light source, and blue light source has an independent control switch.

[0009] The light intensity of the red, green, and blue light sources can all be adjusted independently via the MCU.

[0010] Furthermore, the distribution structure of the red light source, green light source, and blue light source includes one or a combination of linear array distribution, matrix column distribution, ring array distribution, and irregular scattered distribution.

[0011] Furthermore, when the red, green, and blue light sources are arranged in a linear array, the spacing between the red, green, and blue light sources is the same.

[0012] Furthermore, the LCD projection optical engine also includes a rear Fresnel lens, heat-insulating glass, LCD screen, front Fresnel lens, and lens module disposed within the housing and distributed along the light emission direction.

[0013] Furthermore, a light well is provided between the light source and the rear Fresnel lens, with the narrow end of the light well surrounding the light source.

[0014] Furthermore, along the light emission direction, the lens module is provided with a first convex lens, a concave lens, and a second convex lens in sequence.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The light source of this utility model LCD projector optical engine has been enhanced with red, blue and green light sources. By combining the three light sources, the intensity of the corresponding monochromatic light is enhanced, resulting in stronger color performance.

[0017] 2. The LCD projector optical engine of this utility model can correct color deviation by compensating with a monochromatic light source, so that the projected image has higher color fidelity.

[0018] 3. The optical efficiency of the LCD projector of this utility model is higher. When a single white light source is used as the light source to project a monochrome image of red, blue or green, the other two useless lights are turned off, which reduces the heat generation of the light source and reduces the heat dissipation burden of the LCD projector. Attached Figure Description

[0019] Figure 1 This is a diagram showing the light source and lens distribution inside the housing of the LCD projection optical engine of this utility model.

[0020] Figure 2 This is the COB white light spectrum of this utility model.

[0021] Figure 3 This invention relates to the COB monochromatic light spectrum.

[0022] Figure 4 This invention relates to the spectrum of COB white light spectrum + COB monochromatic light source.

[0023] Figure 5 This is a schematic diagram of the circuit connection structure of the white light source, red light source, green light source and blue light source of this utility model.

[0024] The following are labeled in the attached diagram: 1. Light source; 2. Rear lens; 3. Heat-insulating glass; 4. LCD screen; 5. Front lens; 6. Lens module; 7. Red light source; 8. Green light source; 9. Blue light source; 10. Optical tube; 61. First convex lens; 62. Concave lens; 63. Second convex lens. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] Example 1: The specific structure of this utility model is as follows:

[0028] Please refer to the attached Figure 1-5 The present invention discloses a high color reproduction LCD projection light engine, including a light source 1 connected to an MCU. The light source 1 includes a white light source W, and the light source 1 also includes a red light source 7, a green light source 8 and a blue light source 9 interspersed between the light-emitting units of the white light source W; the red light source 7, the green light source 8 and the blue light source 9 are monochromatic light sources.

[0029] After the LCD projection optical engine is powered on, the white light source W is a constantly lit light source;

[0030] The red light source 7), green light source 8 and blue light source 9 are all connected in parallel with the white light source W, and the red light source 7, green light source (8) and blue light source 9 are each equipped with an independent control switch;

[0031] The light intensity of the red light source 7, green light source 8, and blue light source 9 can all be adjusted independently via the MCU.

[0032] The distribution structure of the red light source 7, green light source 8, and blue light source 9 includes one or a combination of linear array distribution, matrix column distribution, ring array distribution, and irregular scattered distribution. Preferably, when the red light source 7, green light source 8, and blue light source 9 are distributed in a linear array, the spacing between the red light source 7, green light source 8, and blue light source 9 is the same.

[0033] like Figure 1-5 As shown, Figure 1This diagram shows the light source and lens distribution inside the housing of the LCD projector optical engine of this invention. The COB light source of a conventional LCD projector optical engine is a white light source W. In this invention, a row of red light sources 7, a row of green light sources 8, and a row of blue light sources 9 are inserted between the conventional white light source W. The switch for the white light source W is connected to the master control switch S1, the switch for the red light source 7 is S2, the switch for the green light source 8 is S3, and the switch for the blue light source 9 is S4.

[0034] A conventional white light source is always on, and it serves the same purpose as a conventional LCD projection light source, meaning that turning on the projector also turns on the conventional white light source.

[0035] The three light sources, red light source 7, green light source 8, and blue light source 9, serve as supplementary sources. They can be lit individually, in combination of two colors, or all three colors together. Furthermore, the intensity of each color light source can be adjusted according to the actual situation.

[0036] like Figure 4 As shown, Figure 4 This invention relates to the spectrum of a COB white light source and a COB monochromatic light source. The red, green, and blue monochromatic light sources and the white light source are simultaneously illuminated, and the light source spectrum is as follows: Figure 4 As shown. Because the light intensity of the light source is enhanced at the corresponding red, green and blue positions, the colors are more accurate and the color gamut is improved when projecting a monochrome image. The intensity of the red, green and blue light sources can be finely adjusted to correct the color deviation of the image, thereby improving the color reproduction. The entire unit is calibrated before leaving the factory to ensure the high color accuracy of the optical engine.

[0037] One way to achieve higher color clarity in projection is to keep the white light source constantly on, while the red, green, and blue monochromatic light sources adjust their on / off status and intensity in real time according to the content of the image. For example, when projecting a red-toned image, the green and blue light sources are turned off or reduced. Because the white light source is constantly on, the red-toned image will appear more accurate and vibrant without affecting the normal display of colors. The color gamut and color reproduction can be further improved based on the previous solution.

[0038] This utility model of LCD projection optical engine also provides the distribution structure of each lens:

[0039] like Figure 1 As shown, the LCD projection optical engine also includes a rear Fresnel lens 2, a heat-insulating glass 3, an LCD screen 4, a front Fresnel lens 5, and a lens module 6, all disposed within the housing and distributed along the light emission direction. A light well 10 is provided between the light source 1 and the rear Fresnel lens 2, with its narrow end surrounding the light source 1 and its wide end extending to the rear Fresnel lens 2. Along the light emission direction, a first convex lens 61, a concave lens 62, and a second convex lens 63 are sequentially disposed within the lens module.

[0040] In summary, the light source of this LCD projector optical engine incorporates red, blue, and green light sources. Through the synthesis of these three colors, the intensity of the corresponding monochromatic light is enhanced, resulting in stronger color reproduction. By compensating for the monochromatic light source, this LCD projector optical engine can correct color shift, leading to higher color fidelity in the projected image. Furthermore, this LCD projector optical engine boasts higher luminous efficiency. When using a single white light source to project a monochromatic image of red, blue, or green, the other two useless light sources are switched off, reducing heat generation and alleviating the heat dissipation burden on the LCD projector optical engine.

[0041] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A high color fidelity LCD projection optical engine, comprising a light source (1) connected to an MCU, wherein the light source (1) comprises a white light source W, characterized in that, The light source (1) also includes a red light source (7), a green light source (8) and a blue light source (9) interspersed between the light-emitting units of the white light source W. After the LCD projection optical engine is powered on, the white light source W is a constantly lit light source; The red light source (7), green light source (8) and blue light source (9) are all connected in parallel with the white light source W, and each of the red light source (7), green light source (8) and blue light source (9) is equipped with an independent control switch; The light intensity of the red light source (7), green light source (8) and blue light source (9) can all be adjusted independently via the MCU.

2. The LCD projection optical engine with high color fidelity according to claim 1, characterized in that, The distribution structure of the red light source (7), green light source (8) and blue light source (9) includes one or a combination of linear array distribution, matrix column distribution, ring array distribution and irregular scattered distribution.

3. The LCD projection optical engine with high color fidelity according to claim 2, characterized in that, When the red light source (7), green light source (8) and blue light source (9) are arranged in a linear array, the spacing between the red light source (7), green light source (8) and blue light source (9) is the same.

4. The LCD projection optical engine with high color fidelity according to claim 1, characterized in that, The LCD projection optical engine also includes a rear Fresnel lens (2), heat-insulating glass (3), LCD screen (4), front Fresnel lens (5), and lens module (6) disposed in the housing and distributed along the light emission direction.

5. The LCD projection optical engine with high color fidelity according to claim 4, characterized in that, A light chamber (10) is provided between the light source (1) and the rear Fresnel mirror (2), and the narrow end of the light chamber (10) surrounds the light source (1).

6. The LCD projection optical engine with high color fidelity according to claim 4, characterized in that, Along the light emission direction, the lens module is provided with a first convex lens (61), a concave lens (62), and a second convex lens (63) in sequence.

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