LCD black-and-white screen projection lighting structure

Abstract

The application provides an LCD black-and-white screen projection lighting structure, which is mainly composed of a projection assembly, a light funnel and a light source rotating disc. The light source rotating disc is designed to rotate around the central axis, so as to reduce the local temperature rise of the light source rotating disc. A plurality of color source areas are arranged in the circumferential direction on the light source rotating disc. The light outlet of the light funnel is opposite to the projection assembly, and the light inlet is opposite to the color source area on the light source rotating disc, so that the light loss in the transmission process is minimized. The light emitted by the color source area is efficiently collected by the light funnel and transmitted to the projection assembly, so that the light utilization rate is improved. The rotation of the light source rotating disc enables the color source areas to work alternately, so that the local high temperature caused by long-time light irradiation in a single area is avoided, and good heat dissipation effect is achieved. Meanwhile, the color source areas are independently lighted, only the working color source area generates heat, the overall heat generation is reduced, and the temperature is lowered.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to a projection lighting structure for an LCD monochrome screen. Background Technology

[0002] LCD projectors have seen their market share increase due to their relatively high cost-performance ratio and continuously improving optical performance. However, LCD projectors often suffer from problems such as low brightness and limited color gamut.

[0003] However, in existing technologies, to solve problems such as low brightness and low color gamut, color filters on LCD screens are combined with RGB LED light sources to improve the color gamut using high-saturation light sources. However, the physical boundaries of the color filters limit the purity of the colors, making it difficult to meet the wide color gamut standard. Alternatively, white light sources are mixed with red / green complementary light sources to supplement the light. Although this can partially compensate for the brightness deficiency, the white light conversion and the mixing of multiple light sources result in low light energy utilization and poor color consistency. Another approach is to achieve color imaging by controlling the RGB light source and the grayscale modulation of the black and white screen in a time-division manner. However, the spaced arrangement of the light sources or the mixed patch design results in an excessively large light-emitting surface, causing severe scattering of light when it enters the light chamber, resulting in significant light energy loss and actual brightness far below the theoretical value. Yet another approach is to use a blue laser to excite the phosphor on the color wheel to generate RGB three-color light. Although this can improve the brightness of a single color, continuous laser irradiation causes extremely high local temperature rises on the color wheel. The phosphor material ages rapidly due to heat accumulation, leading to color shift (increased ΔE) and light decay. This requires frequent replacement of the color wheel, resulting in high maintenance costs.

[0004] Therefore, there is a need to provide an LCD monochrome screen projection lighting structure that reduces light energy waste and heat generation. Utility Model Content

[0005] In view of this, it is necessary to provide an LCD monochrome screen projection lighting structure that reduces light energy waste and heat generation in order to solve the above problems.

[0006] Embodiments of this application provide an LCD monochrome screen projection lighting structure, comprising:

[0007] Projection assembly, used to emit projection light;

[0008] The light chamber has its light outlet facing the projection component.

[0009] A light source turntable is rotatably mounted around the central axis of the light source turntable;

[0010] Along the circumferential direction of the light source turntable, the light source turntable has at least one set of light-emitting areas, and the light-emitting areas have multiple uniformly arranged color source areas. Each color source area is independently lit, and the light inlet of the light chamber is directly opposite one of the color source areas, so that the light emitted by the color source area is transmitted to the projection component through the light chamber.

[0011] In at least one embodiment of this application, the color source area includes a first color source area, a second color source area and a third color source area, and each color source area has a plurality of light-emitting elements.

[0012] In at least one embodiment of this application, the first color source region is a red light-emitting region, the second color source region is a green light-emitting region, and the third color source region is a blue light-emitting region.

[0013] In at least one embodiment of this application, the light source turntable further includes a rotating member connected to the light source turntable to rotate the light source turntable.

[0014] In at least one embodiment of this application, the first color source region, the second color source region, and the third color source region are distributed in a fan shape according to the color source ratio.

[0015] In at least one embodiment of this application, the projection component includes an LCD screen, which is disposed at the light outlet of the light chamber.

[0016] In at least one embodiment of this application, the projection assembly further includes heat-insulating glass disposed between the light chamber and the LCD screen.

[0017] In at least one embodiment of this application, the projection assembly further includes a lens module disposed at one end away from the light chamber.

[0018] In at least one embodiment of this application, the projection assembly further includes an illumination lens and an imaging lens, the illumination lens being disposed between the heat-insulating glass and the light box, and the imaging lens being disposed between the LCD screen and the lens module.

[0019] In at least one embodiment of this application, the light source turntable is made of either a metal or ceramic substrate.

[0020] The aforementioned LCD monochrome screen projection lighting structure mainly consists of three parts: a projection component, a light chamber, and a light source turntable. By designing it to rotate around the central axis of the light source turntable, localized temperature increases are reduced. Multiple color source areas are evenly arranged circumferentially on the light source turntable. The light outlet of the light chamber is directly aligned with the projection component, while the light inlet faces the color source areas on the light source turntable. This minimizes light loss during transmission, allowing the light emitted from the color source areas to be efficiently converged and transmitted to the projection component, improving light utilization. The rotation of the light source turntable causes each color source area to work alternately, avoiding localized high temperatures caused by prolonged illumination of a single area, achieving excellent heat dissipation. Simultaneously, each color source area is independently illuminated, with only the working color source area generating heat, reducing overall heat generation and lowering the temperature. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an LCD monochrome screen projection lighting structure in an embodiment of this application.

[0022] Figure 2 This is a schematic diagram of the structure of the light source turntable in the embodiment of this application.

[0023] Explanation of main component symbols

[0024] 100. An LCD monochrome screen projection lighting structure; 10. Projection component; 11. LCD screen; 12. Heat-insulating glass; 13. Lens module; 131. Illumination lens; 132. Imaging lens; 20. Light chamber; 30. Light source turntable; 31. First color source area; 32. Second color source area; 33. Third color source area; 34. Light-emitting element; 35. Rotating element. Detailed Implementation

[0025] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0026] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0027] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] according to Figures 1-2 This application provides an LCD black and white screen projection lighting structure 100, including: a projection component 10, a light chamber 20 and a light source turntable 30.

[0029] The projection component 10 is used to emit projection light; the light outlet of the light chamber 20 is positioned directly opposite the projection component 10; and the light source turntable 30 is rotatably positioned from the central axis of the light source turntable 30.

[0030] Along the circumferential direction of the light source turntable 30, the light source turntable 30 has at least one set of light-emitting areas, each of the color source areas is independently lit, and the light-emitting areas have multiple evenly arranged color source areas. The light inlet of the light chamber 20 is directly opposite one of the color source areas, so that the light emitted by the color source area is transmitted to the projection component 10 through the light chamber 20.

[0031] Specifically, the projection component 10, as the core imaging structure, receives light transmitted through the light source 20 and converts the light into a projectable image signal through grayscale modulation of the monochrome LCD screen, ultimately projecting a visual image. The use of a monochrome LCD without color filters avoids the limitations imposed by color filters on light absorption and color purity.

[0032] In this application, the light chamber 20 is formed by four sides. The light inlet of the light chamber 20 has a small area and the light outlet has a large area. The cross-section gradually expands from the light inlet to the light outlet. Light enters from the small end of the light inlet, is reflected by the inner wall, and exits from the large end of the light outlet, thereby reducing light leakage and stray light in the optical path.

[0033] The light source turntable 30 is a circular turntable structure. As the turntable rotates, the color source areas distributed along its inner circumference align sequentially with the light inlet of the light chamber 20, achieving sequential output of light from the color source areas. Furthermore, the rotation of the turntable 30 facilitates heat exchange with the air, dissipating heat to the outside and reducing the temperature rise of the turntable 30. Simultaneously, only a single color source area faces the light inlet of the light chamber 20, allowing the light chamber 20 to concentrate and constrain the light emitted from that area, ultimately improving projection brightness and reducing light waste. This avoids the mixed light interference caused by the simultaneous operation of multiple light sources in traditional systems. Additionally, color source areas not aligned with the light chamber 20 remain off during rotation, preventing unnecessary energy consumption.

[0034] It should be noted that the number of light-emitting zones can be adjusted as needed, and they are arranged sequentially along the circumference of the light source turntable 30.

[0035] By controlling the emission time of each color source area and coordinating with the grayscale modulation of the black-and-white screen, the brightness of the corresponding color can be adjusted. Independently lit color source areas avoid the energy waste of multiple color light sources emitting light simultaneously, allowing light energy to be transmitted more concentratedly through the light source 20 only in the required color source areas.

[0036] In one specific embodiment, the color source area includes a first color source area 31, a second color source area 32 and a third color source area 33, and each color source area has a plurality of light-emitting elements 34.

[0037] In one specific embodiment, the first color source area 31 is a red light-emitting area, the second color source area 32 is a green light-emitting area, and the third color source area 33 is a blue light-emitting area.

[0038] In one specific embodiment, the first color source area 31, the second color source area 32, and the third color source area 33 are distributed in a fan shape according to the color source ratio.

[0039] Specifically, it should be noted that when the light source turntable 30 rotates, if the number of light-emitting zones is 1, the light inlet of the light chamber 20 passes through one light-emitting zone after one full rotation of the light source turntable 30, sequentially passing through the first color source zone 31, the second color source zone 32, and the third color source zone 33, completing one complete "red-green-blue" color sequence cycle. The number of light-emitting zone groups on the light source turntable 30 refers to the number of color source zone combinations that are completely distributed circumferentially. Each light-emitting zone group contains three basic color sources: the first color source zone 31, the second color source zone 32, and the third color source zone 33. The first color source zone 31 corresponds to the red light source, the second color source zone 32 corresponds to the green light source, and the third color source zone 33 corresponds to the blue light source. The angle of each color source zone is set according to the proportion of its corresponding RGB light source. Here, "proportion" usually refers to the design ratio of the three light sources: red, green, and blue, including but not limited to the ratio of brightness, luminous flux, or the luminous intensity ratio required in actual applications.

[0040] When the number of light-emitting areas is 2, the two groups of light-emitting areas are arranged around the circumference of the light source turntable 30. When the light source turntable 30 rotates once, the light inlet of the light chamber 20 will pass through the two groups of light-emitting areas in turn, that is, it will pass through the first group of red-green-blue and the second group of red-green-blue in turn, completing two "red-green-blue" color sequence cycles in total, and then continue to cycle in turn.

[0041] It should be noted that the number of light-emitting zones on the light source turntable 30 can be set to any positive integer as needed. The more zones there are, the more times the light source port of the light chamber 20 passes through the color source zone in the same amount of time, and the fewer rotations the light source turntable 30 needs to make to achieve the same frame rate.

[0042] Furthermore, the color source area is divided according to the three primary colors (RGB), covering the basic color range perceptible to the human eye, providing a fundamental spectral source for color projection. Through independent control and sequential combination of red, green, and blue, the vast majority of colors found in nature can be mixed.

[0043] Furthermore, the light-emitting element 34 is a light-emitting chip. The light-emitting chip in each color source area emits a different color. The light-emitting element 34 in the first color source area 31 emits red light, the second color source area 32 emits green light, and the third color source area 33 emits blue light. The light-emitting chips in the same color source area emit light or turn off in parallel. Multiple light-emitting elements 34 are arranged in the same color source area (such as in a matrix or ring distribution) to make the brightness distribution of the light-emitting surface in the color source area more uniform, avoid the light spot effect caused by single-point light emission, and ensure that the light intensity entering the light chamber 20 is consistent.

[0044] In summary, as the light source turntable 30 rotates around its central axis, its circumferential RGB color source areas sequentially pass through the light inlet of the light chamber 20. When the red color source area rotates to face the light inlet of the light chamber 20, the red color source area lights up alone, while the other color source areas turn off. The red light is then converged by the light chamber 20 and transmitted to the LCD black-and-white screen of the projection component 10, at which point the black-and-white screen synchronously displays a red grayscale image. As the light source turntable 30 continues to rotate, the green color source area faces the light inlet of the light chamber 20, and the green color source area lights up, displaying a green grayscale image on the black-and-white screen. The green light, after being transmitted through the light chamber 20, matches the green grayscale image. When the blue color source area rotates to face the light inlet of the light chamber 20, the blue color source area lights up, displaying a blue grayscale image on the black-and-white screen. The blue light, after being transmitted through the light chamber 20, completes the matching process. Ultimately, due to the high rotation speed of the turntable, the switching frequency of red, green, and blue light rays and their corresponding grayscale images is higher than the human eye's visual persistence threshold. The human eye will accumulate the energy of the three-color grayscale images and ultimately perceive them as a continuous color projection image.

[0045] In one specific embodiment, the light source turntable 30 further includes a rotating member 35, which is connected to the light source turntable 30 to rotate the light source turntable 30.

[0046] Specifically, the rotating component 35 can be any type of power source, such as a stepper motor or a servo motor, and transmits power to the light source turntable 30 through mechanical connections such as bushings or gear transmissions, driving the light source turntable 30 to rotate around the central axis, ensuring that different color source areas can be accurately aligned with the light inlet of the light chamber 20.

[0047] The rotating component 35 drives the light source turntable 30 to rotate continuously, so that each color source area works alternately, reducing the continuous light emission time of a single color source area, reducing local heat accumulation, slowing down the aging speed of the light-emitting component 34, and extending its service life.

[0048] In one specific embodiment, the projection component 10 includes an LCD screen 11, which is disposed at the light outlet of the light chamber 20.

[0049] Specifically, the LCD screen 11 is a monochrome screen. Traditional color screens absorb about 2 / 3 of the incident light through their color filters (e.g., a red filter only allows red light to pass through, while green and blue light are absorbed), resulting in a serious waste of light energy. In contrast, the monochrome LCD screen 11 does not selectively absorb light. The light emitted from the color source area is only slightly lost due to grayscale modulation, and most of the light can be transmitted to subsequent optical components through the screen, significantly improving the actual brightness.

[0050] By rotating the light source turntable 30, the light inlet of the light chamber 20 can output colors according to the rotation, thus achieving color imaging. Through the persistence of vision effect of the human eye, the three grayscale images are superimposed to form a complete color image.

[0051] In one specific embodiment, the projection assembly 10 further includes heat-insulating glass 12, which is disposed between the light chamber 20 and the LCD screen 11.

[0052] Specifically, the heat-insulating glass 12 acts as a temperature barrier between the light source 20 and the LCD screen 11. Its core function is to prevent the heat carried by the light transmitted through the light source 20 from being transferred to the LCD screen 11. During the process of converging light, the light source 20 generates heat due to the concentrated energy of the light, some of which is conducted to the light outlet. Simultaneously, while the rotation of the light source turntable 30 disperses localized high temperatures, a small amount of heat still radiates into the light source 20 through the air or light radiation. The heat-insulating glass 12, with its low thermal conductivity and high light transmittance, allows visible light to pass through efficiently while significantly reducing heat conduction efficiency, thus minimizing heat transfer to the LCD screen 11. Temperature fluctuations affect the uniformity of liquid crystal molecule arrangement, leading to uneven brightness and color shifts (such as localized color casts). The heat-insulating glass 12 stabilizes the operating temperature of the LCD screen 11, ensuring that grayscale modulation accuracy is not affected by temperature and guaranteeing image consistency.

[0053] In one specific embodiment, the projection assembly 10 further includes a lens module 13, which is located at the end away from the light chamber 20.

[0054] Specifically, the lens module 13 serves as the final imaging output end of the projection assembly 10. Its function is to amplify and focus the image light modulated by the LCD screen 11 and project it onto a screen or other imaging surface. The lens module 13 is typically composed of multiple optical lenses. Through the curvature design and spacing adjustment of the lenses, focal length adjustment, zoom, and distortion correction can be achieved.

[0055] In one specific embodiment, the projection assembly 10 further includes an illumination lens 131 and an imaging lens 132. The illumination lens 131 is disposed between the heat-insulating glass 12 and the light chamber 20, and the imaging lens 132 is disposed between the LCD screen 11 and the lens module 13.

[0056] Specifically, both the illumination lens 131 and the imaging lens 132 are Fresnel lenses. The illumination lens 131 homogenizes and collimates the light output from the light source 20. Although the light converged by the light source 20 is relatively concentrated, there may still be local brightness unevenness (such as stronger light near the center of the color source area). The illumination lens 131 redistributes the light through a microstructure design, such as the annular texture of a Fresnel lens, making the brightness distribution of the light illuminating the LCD screen 11 more uniform. At the same time, it adjusts the diverging light into parallel or small-angle converged light to ensure that each pixel of the LCD screen 11 receives uniform incident light.

[0057] The imaging lens 132 initially converges and corrects the image light from the LCD screen 11, providing a high-quality imaging result for the final projection of the lens module 13. The imaging lens 132 converts the light beam into a shape suitable for the lens module 13 through optical focusing, while correcting the light deflection at the edge of the LCD screen 11, ensuring that the light entering the lens module 13 carries complete and clear image information.

[0058] In one specific embodiment, the light source turntable 30 is made of either a metal or ceramic substrate.

[0059] Specifically, metals have extremely high thermal conductivity (approximately 200 W / (m·K) for aluminum alloys and approximately 400 W / (m·K) for copper), enabling them to quickly conduct heat from the light-emitting element 34 to the entire rotating disk. Ceramic, with a thermal conductivity of 150–200 W / (m·K), while slightly lower than metals, exhibits excellent insulation and high-temperature resistance. Both substrates can reduce localized temperature increases in the light source rotating disk 30 through heat conduction within the disk itself and heat dissipation via its rotation.

[0060] Therefore, the LCD monochrome screen projection lighting structure 100 provided above mainly consists of three parts: a projection component 10, a light chamber 20, and a light source turntable 30. By designing it to rotate around the central axis of the light source turntable 30, the local temperature rise of the light source turntable 30 is reduced. By providing multiple color source areas evenly arranged circumferentially on the light source turntable 30, with the light outlet of the light chamber 20 directly aligned with the projection component 10 and the light inlet facing the color source areas on the light source turntable 30, the loss of light during transmission can be minimized. This allows the light emitted from the color source areas to be efficiently converged and transmitted to the projection component 10 through the light chamber 20, improving light utilization. The rotation of the light source turntable 30 causes each color source area to work alternately, avoiding local high temperatures caused by prolonged exposure to light in a single area, thus achieving good heat dissipation. At the same time, the color source areas are lit independently, with only the working color source areas generating heat, reducing overall heat generation and lowering the temperature.

[0061] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A projection lighting structure for an LCD monochrome screen, characterized in that, include: Projection assembly, used to emit projection light; The light chamber has its light outlet facing the projection component. A light source turntable is rotatably mounted around the central axis of the light source turntable; Along the circumferential direction of the light source turntable, the light source turntable has at least one set of light-emitting areas, each light-emitting area has multiple uniformly arranged color source areas, each color source area is independently lit, and the light inlet of the light chamber is directly opposite one of the color source areas, so that the light emitted by the color source area is transmitted to the projection component through the light chamber.

2. The LCD monochrome screen projection illumination structure according to claim 1, characterized in that, The color source area includes a first color source area, a second color source area and a third color source area, and each color source area has multiple light-emitting elements.

3. The LCD monochrome screen projection illumination structure according to claim 2, characterized in that, The first color source area is a red light-emitting area, the second color source area is a green light-emitting area, and the third color source area is a blue light-emitting area.

4. The LCD monochrome screen projection illumination structure according to claim 1, characterized in that, The light source turntable also includes a rotating component connected to the light source turntable to rotate the light source turntable.

5. The LCD monochrome screen projection illumination structure according to claim 2, characterized in that, The first color source area, the second color source area, and the third color source area are distributed in a fan shape according to the proportion of color sources.

6. The LCD monochrome screen projection illumination structure according to claim 1, characterized in that, The projection component includes an LCD screen, which is located at the light outlet of the light chamber.

7. The LCD monochrome screen projection illumination structure according to claim 6, characterized in that, The projection assembly also includes heat-insulating glass, which is disposed between the light chamber and the LCD screen.

8. The LCD monochrome screen projection illumination structure according to claim 7, characterized in that, The projection assembly also includes a lens module, which is located at the end away from the light chamber.

9. The LCD monochrome screen projection illumination structure according to claim 8, characterized in that, The projection assembly further includes an illumination lens and an imaging lens. The illumination lens is disposed between the heat-insulating glass and the light box, and the imaging lens is disposed between the LCD screen and the lens module.

10. The LCD monochrome screen projection illumination structure according to claim 1, characterized in that, The light source turntable is made of either a metal or ceramic substrate.

Images