Light engine

Abstract

The utility model discloses a light engine which comprises a first part used for controlling image display, a second part used for adjusting imaging light, a third part used for improving imaging resolution and other parts, the first part is arranged on one side of the other parts, and the second part and the third part are arranged in the other parts. The third part is arranged between the first part and the second part, and / or the third part is arranged on the side, away from the first part, of the second part; wherein the first part is a display screen, the second part is an optical engine lens group, the third part comprises a birefringent crystal and a liquid crystal, and the other parts comprise an optical engine lens shell. According to the utility model, under the condition that the appearance specification and the optical structure of the optical engine are not changed, the resolution of the optical engine can be multiplied by controlling the refreshing of the birefringent crystal and the liquid crystal and matching with reasonable content output at an application end, so that the use effect and the use experience of the optical engine are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical display, in particular to a light engine. Background Art

[0002] Optical projection technology is an important field of modern display technology, which has been widely used in image display, virtual reality, augmented reality and other fields. With the development of science and technology, people have higher and higher requirements for image resolution and image quality.

[0003] Most existing projection technologies use a single optical system to achieve image projection, which limits the resolution and image quality of the projected image to a certain extent.

[0004] In the prior art, there are already some methods and technologies related to resolution improvement, but the actual effects of these methods in the projection lens are not ideal, which leads to the problem of low resolution in practical applications. Utility Model Content

[0005] The utility model aims to provide a light engine, aiming to solve the problems of low resolution of existing image projection.

[0006] The present invention provides a light engine, comprising: a first part for controlling image display, a second part for adjusting imaging light, a third part for improving imaging resolution and other parts, wherein the first part is arranged at one side of the other part, the second part and the third part are arranged inside the other part, the third part is arranged between the first part and the second part, and / or the third part is arranged at a side of the second part away from the first part;

[0007] Among them, the first part is a display screen, the second part is a light engine lens group, the third part includes a birefringent crystal and a liquid crystal, and the other parts include a light engine lens housing.

[0008] Further, when the third part is arranged between the first part and the second part, the first part is arranged on one side of the birefringent crystal, and the liquid crystal is arranged on the other side of the birefringent crystal;

[0009] When the third portion is disposed on a side of the second portion away from the first portion, the second portion is disposed on one side of the birefringent crystal, and the liquid crystal is disposed on the other side of the birefringent crystal.

[0010] Furthermore, the birefringent crystal and the liquid crystal are arranged in parallel.

[0011] Furthermore, the material of the birefringent crystal includes: one or more of quartz, ruby, sapphire, mica, calcite, olivine or ice.

[0012] Furthermore, the ordinary light and the extraordinary light output by the birefringent crystal are parallel or quasi-parallel, and there is a displacement between the ordinary light and the extraordinary light.

[0013] Furthermore, the response time of the liquid crystal is less than or equal to 1 ms.

[0014] Furthermore, a refresh rate of the liquid crystal is greater than or equal to twice a refresh rate of the first part.

[0015] Furthermore, the display screen is driven by any one of DLP, LCOS, LBS, microoled and microled.

[0016] Furthermore, the second part includes at least one lens.

[0017] Furthermore, the lens is coated with an anti-reflection and anti-reflection film.

[0018] The utility model discloses a light engine, comprising: a first part for controlling image display, a second part for adjusting imaging light, a third part for improving imaging resolution and other parts, wherein the first part is arranged on one side of the other parts, the second part and the third part are arranged in the other parts, the third part is arranged between the first part and the second part, and / or the third part is arranged on the side of the second part away from the first part; wherein the first part is a display screen, the second part is a light engine lens group, the third part includes a birefringent crystal and a liquid crystal, and the other parts include a light engine lens housing. The utility model can achieve a doubling of the light engine resolution by controlling the refresh of the birefringent crystal and the liquid crystal without changing the external specifications and optical structure of the light engine, and by matching the reasonable content output at the application end, thereby greatly improving the use effect and use experience of the light engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a schematic diagram of the structure of the light engine;

[0021] Figure 2It is a schematic diagram of the structure of the light engine when imaging with ordinary light;

[0022] Figure 3 It is a schematic diagram of the structure of the light engine when it is imaging with extraordinary light;

[0023] Figure 4 It is a schematic diagram of the structure when ordinary light and extraordinary light are projected;

[0024] Figure 5 It is a schematic diagram of the structure of the light engine of some other embodiments;

[0025] Figure 6 This is a flow chart of the core technology of the optical engine;

[0026] Description of the markings in the figure:

[0027] 1. The first part; 2. The second part; 3. The third part; 4. Other parts; 5. Birefringent crystal; 6. Liquid crystal. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0030] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0031] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0032] See also Figure 1-5The utility model provides a light engine, comprising: a first part 1 for controlling image display, a second part 2 for adjusting imaging light, a third part 3 for improving imaging resolution, and other parts 4, wherein the first part 1 is arranged on one side of the other parts 4, the second part 2 and the third part 3 are arranged in the other parts 4, the third part 3 is arranged between the first part 1 and the second part 2, and / or the third part 3 is arranged on a side of the second part 2 away from the first part 1;

[0033] The first part 1 is a display screen, the second part 2 is a light engine lens group, the third part 3 includes a birefringent crystal 5 and a liquid crystal 6, and the other part 4 includes a light engine lens housing.

[0034] This embodiment can control the refresh of the birefringent crystal 5 and the liquid crystal 6 without changing the appearance specifications and optical structure of the light engine, and can double the resolution of the light engine in combination with reasonable content output on the application end, thereby greatly improving the use effect and user experience of the light engine. In addition, by arranging the birefringent crystal 5 and the liquid crystal 6 in the light engine, the structure of the light engine is more compact and the design is more natural.

[0035] In this embodiment, the birefringent crystal 5 needs to be arranged in front of the liquid crystal 6. For details, please refer to Figure 5 , when the third part 3 is arranged between the first part 1 and the second part 2, the first part 1 is arranged on one side of the birefringent crystal 5, and the liquid crystal 6 is arranged on the other side of the birefringent crystal 5;

[0036] See also Figure 2 When the third part 3 is arranged on a side of the second part 2 away from the first part 1 , the second part 2 is arranged on one side of the birefringent crystal 5 , and the liquid crystal 6 is arranged on the other side of the birefringent crystal 5 .

[0037] Furthermore, the birefringent crystal 5 and the liquid crystal 6 are arranged in parallel. In this embodiment, a unique display system is formed by arranging the birefringent crystal 5 and the liquid crystal 6 in parallel. This system utilizes the respective characteristics of the birefringent crystal 5 and the liquid crystal 6 to achieve a high-quality display effect.

[0038] Furthermore, the material of the birefringent crystal 5 includes one or more of quartz, ruby, sapphire, mica, calcite, olivine or ice.

[0039] In this embodiment, the ordinary light (o light) and extraordinary light (e light) output by the birefringent crystal 5 are parallel or quasi-parallel (eg Figure 2 and Figure 3 As shown), there is a displacement between ordinary light and extraordinary light (as shown Figure 4As shown, oimage in the figure represents ordinary light imaging; eimage in the figure represents extraordinary light imaging; delta in the figure represents the displacement difference between ordinary light imaging and extraordinary light imaging). The displacement is caused by the inhomogeneity of the lattice structure inside the birefringent crystal 5. Under certain conditions, when the light passes through the birefringent crystal 5, it will be divided into two beams of light, one of which is ordinary light and the other is extraordinary light. In this embodiment, by controlling the direction angle of the birefringent crystal 5, the distance between the ordinary light and the extraordinary light can be staggered by half a pixel along the diagonal of the screen. At this time, if a suitable driving and screen refresh method is adopted, the human eye can multiply the perception of the picture projected by the light engine.

[0040] In this embodiment, if the image refresh rate is 60 Hz, in order to have a doubling effect, the refresh rate must at least be doubled to 120 Hz. In this way, in order to match the high refresh rate, the response time of the liquid crystal 6 needs to be 1 / 120=8ms. Therefore, in order to adapt to a higher refresh rate, the response time of the liquid crystal 6 in this embodiment is less than or equal to 1ms. The response time of the liquid crystal 6 is less than or equal to 1ms, which means that in a very short time, the liquid crystal 6 can quickly change its state, thereby presenting a clear image on the display. This fast response time enables the liquid crystal 6 to have high performance in dynamic image display.

[0041] Furthermore, in order to increase the resolution of the light engine, the image needs to be slightly displaced, and the process of producing the slight displacement needs to be fast enough. If the refresh is not fast enough, the human eye will perceive flicker or blur. In order to maintain the continuity of the image, the light engine is always in a state of continuous refreshing. Generally, the minimum required refresh rate is 60HZ. If it is lower than 60HZ, there is a probability that someone will perceive the screen flicker. The best solution is to shift the image before and after refreshing the image, which has the least impact on the human eye. However, if the image is simply displaced at a refresh rate of 60HZ, it is equivalent to reducing the refresh rate to 30HZ. At this time, everyone will feel flickering. Therefore, the refresh rate of 60HZ must be increased to 120HZ, so that the image will not flicker when switching. The liquid crystal 6 must control the corresponding position to emit the corresponding light at the right time, so it must meet the refresh rate of 120HZ. In other words, to ensure the high resolution of the light engine, the refresh rate of the liquid crystal 6 of this embodiment is greater than or equal to twice the refresh rate of the first part 1, and the frequency of the liquid crystal 6 matches the display image.

[0042] In this embodiment, the liquid crystal 6 can be configured with a variety of driving methods, including static driving method and dynamic driving method. The static driving method is to control each pixel point individually, and to control the rotation direction and polarization state of the liquid crystal 6 by adjusting the potential signal of each pixel point, so as to achieve the display effect. The dynamic driving method is to control the pixel points in groups, and each pixel point has a corresponding driving signal. The rotation direction and polarization state of the liquid crystal 6 are controlled by adjusting the potential signal of each pixel point, so as to achieve the display effect. The dynamic driving method can reduce the complexity and cost of the driving circuit, and can also improve the display quality and response speed.

[0043] In addition to the static driving method and the dynamic driving method, the liquid crystal 6 can also be configured with other driving methods, such as matrix driving, sequential driving, etc. These driving methods can be selected and configured according to specific application requirements.

[0044] In this embodiment, the first part 1 is a display screen, and the driving mode of the display screen is any one of DLP, LCOS, LBS, microoled and microled. DLP (Digital Light Processing) is a projection display technology based on micromirror technology. It converts digital images into pixel-level reflected light beams through a micromirror array, and projects the image onto the screen through the reflected light beam. The DLP driving mode usually uses a digital micromirror device (DMD) as a core component, and realizes the display of the image by controlling the reflection angle of each micromirror; LCOS (Liquid Crystal on Silicon) is a projection display technology based on liquid crystal display technology. It uses a liquid crystal layer on a silicon substrate as a pixel, and realizes the display of the image by controlling the deflection of the liquid crystal. The LCOS driving mode usually uses a TFT (thin film transistor) on a silicon substrate as a pixel control circuit, and controls the deflection angle of the liquid crystal by controlling the potential of each pixel; LBS (Laser Beam Scanning) is a display technology based on laser scanning technology. It uses a laser beam as a light source, and realizes the display of the image by scanning the laser beam to form pixels on the screen. The LBS driving method usually uses components such as laser emitters, scanning mirrors and control systems to display images by controlling the emission and scanning path of the laser beam; microOLED is a display technology based on organic light-emitting diode technology. It uses tiny organic light-emitting diodes as pixels and displays images by controlling the light emission of each pixel. The microOLED driving method usually uses TFT or OTFT (organic thin film transistor) as pixel control circuits to control the light emission of organic light-emitting diodes by controlling the potential of each pixel; microLED is a display technology based on micro light-emitting diode technology. It uses tiny light-emitting diodes as pixels and displays images by controlling the light emission of each pixel. The microLED driving method usually uses TFT or integrated circuits on Si substrates as pixel control circuits to control the light emission of micro light-emitting diodes by controlling the potential of each pixel.

[0045] Among them, the resolution of the image output by the display screen is an important indicator to measure the clarity of the image. To ensure that the image has high clarity, the resolution of the image output by the display screen of this implementation is 240p or above.

[0046] In this embodiment, the second part 2 is a light engine lens group (lens), which includes at least one lens. The function of the light engine lens group is to control the light entering and adjust the clarity and color of the image. These lenses are usually made of high-quality materials to ensure image quality and stability. Different lens combinations can produce different optical effects to meet different application requirements.

[0047] In order to pursue better optical performance, the lens of this embodiment is coated with an anti-reflection and anti-reflection film; this film can effectively suppress reflections within the lens, reduce stray light, and enable the wearer to see distant objects more clearly. At the same time, the anti-reflection and anti-reflection film can also enhance the wear resistance and weather resistance of the lens, making the lens more durable.

[0048] In this embodiment, please refer to Figure 1 , also includes other parts 4, such as a light engine lens housing (OC) and the like.

[0049] When the third part 3 is arranged on the side of the second part 2 away from the first part 1, its working principle is as follows: the light emitted by the display screen for display passes through the light engine lens group and enters the birefringent crystal 5. The birefringent crystal 5 causes the imaging light passing through the lens to undergo birefringence (birefringence is the phenomenon that a light beam incident on an anisotropic crystal is decomposed into two beams of light and refracted in different directions), thereby generating two kinds of light - ordinary light (o light) and extraordinary light. The two beams of light will be Figure 2 The directions shown are separated for propagation, and the directions of the liquid crystal molecules in the liquid crystal 6 can be controlled so that ordinary light can be further imaged through the liquid crystal 6.

[0050] In some embodiments, the direction of the liquid crystal molecules in the liquid crystal 6 can be controlled so that the extraordinary light can be further imaged through the liquid crystal 6, such as Figure 4 As shown, there is a slight displacement difference between the images projected by ordinary light and extraordinary light.

[0051] When the third part 3 is arranged between the first part 1 and the second part 2, the light generated by the display screen to display the image is regulated in advance by the birefringent crystal 5 and the liquid crystal 6, and the regulated light is then adjusted by the lens to achieve the desired optical effect.

[0052] The main technical principles involved in this embodiment include:

[0053] 1. Explanation of the principle of birefringent crystal:

[0054] The phenomenon of double refraction describes that when light passes through certain specific crystals (such as perovskite), it will be decomposed into two beams of light with different propagation directions. These two beams of light are called ordinary light and extraordinary light. The two beams of light propagate on different paths due to their different refractive indices.

[0055] 2. Analysis of the controllability of liquid crystal technology:

[0056] The characteristic of liquid crystal is that its optical properties can be adjusted by an external electric field, thereby achieving precise control of the propagation path of light. In this case, liquid crystal is used to adjust the paths of the two beams of light generated by the birefringent crystal to achieve half-pixel level offset.

[0057] 3. Interpretation of the persistence of vision effect:

[0058] The human eye and brain rely on the persistence of vision effect to process consecutive images. Specifically, after an image disappears from the retina, its impression in the brain remains for a period of time. This allows the human brain to fuse two slightly offset images into a higher resolution image.

[0059] See also Figure 6 , its core technical process is:

[0060] 1. Image signal input: Get the original image signal from the signal source.

[0061] 2. CPLD chip preprocessing: The original image signal is processed through the CPLD chip and the resolution enhancement algorithm is applied.

[0062] 3. Lens adjustment: The processed image signal passes through the lens system and is optically adjusted to ensure that the image has the correct focus and alignment before being processed by the birefringent crystal.

[0063] 4. Birefringent crystal adjustment: The adjusted light passes through the birefringent crystal to achieve light dislocation along a specific direction.

[0064] 5. LCD control frequency matching: Adjust the control frequency of the LCD display to match the frequency of the signal processed by the CPLD chip.

[0065] 6. Pixel staggered display: Pixel staggered display is implemented on LCD, using fast refresh and human vision principles to achieve visual improvement of resolution.

[0066] 7. Visual fusion effect: Create a continuous and higher-resolution visual effect through fast pixel dislocation that is imperceptible to the human eye.

[0067] 8. Final output: The display outputs the final adjusted and processed image to provide users with an enhanced visual experience. Image synthesis and visual persistence effect

[0068] Visual processing: This approach relies on the properties of the human visual system, which can seamlessly blend these closely packed and slightly offset pixels into a unified visual experience.

[0069] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0070] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0071] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A light engine, characterized in that: include: A first part for controlling image display, a second part for adjusting imaging light, a third part for improving imaging resolution and other parts, wherein the first part is arranged at one side of the other parts, the second part and the third part are arranged inside the other parts, the third part is arranged between the first part and the second part, and / or the third part is arranged at a side of the second part away from the first part; Among them, the first part is a display screen, the second part is a light engine lens group, the third part includes a birefringent crystal and a liquid crystal, and the other parts include a light engine lens housing.

2. The light engine according to claim 1, characterized in that: When the third portion is disposed between the first portion and the second portion, the first portion is disposed on one side of the birefringent crystal, and the liquid crystal is disposed on the other side of the birefringent crystal; When the third portion is disposed on a side of the second portion away from the first portion, the second portion is disposed on one side of the birefringent crystal, and the liquid crystal is disposed on the other side of the birefringent crystal.

3. The light engine according to claim 2, characterized in that: The birefringent crystal and the liquid crystal are arranged in parallel.

4. The light engine according to claim 1, characterized in that: The material of the birefringent crystal includes: one of quartz, ruby, sapphire, mica, calcite, olivine or ice.

5. The light engine according to claim 1, characterized in that: The ordinary light and the extraordinary light output by the birefringent crystal are parallel or quasi-parallel, and there is a displacement between the ordinary light and the extraordinary light.

6. The light engine according to claim 2, characterized in that: The response time of the liquid crystal is less than or equal to 1 ms.

7. The light engine according to claim 6, characterized in that: The refresh rate of the liquid crystal is greater than or equal to twice the refresh rate of the first part.

8. The light engine according to claim 1, characterized in that: The display screen is driven by any one of DLP, LCOS, LBS, microoled and microled.

9. The light engine according to claim 1, characterized in that: The second portion includes at least one lens.

10. The light engine according to claim 9, characterized in that: The lens is coated with an anti-reflection film.

Images