Display module and head-up display

Abstract

This application provides a display module and a head-up display. The method includes: a lens assembly comprising a polarizing lens, one side of which is concave as an incident light surface, and the other side of which is convex as an exiting light surface. The polarizing lens is disposed opposite to a light source on a light source assembly, and is used to guide light emitted from light sources at different positions through the incident light surface and through the exiting light surface to a target position on the screen; wherein the target position is determined according to the tilt angle of the screen. This method is used to improve the display effect of the screen during use.

Description

Technical Field

[0001] This application relates to the field of image processing technology, and more particularly to a display module and a head-up display. Background Technology

[0002] Head-up displays (HUDs), as an advanced in-vehicle information display technology, have been widely used in the automotive industry in recent years. By projecting key driving information directly onto the windshield in front of the driver, they allow the driver to obtain necessary driving data without having to look down at the instrument panel, thereby improving driving safety and convenience.

[0003] Existing HUD systems typically employ an image generation unit (PGU) based on a TFT-LCD screen design. This unit includes a light source, a series of optical lenses, optical films, and a TFT-LCD screen. To prevent stray light interference and ensure image clarity, the TFT-LCD screen needs to be installed at a specific angle so that the projected virtual image can be accurately presented to the driver while maintaining good visual quality.

[0004] However, existing HUD systems suffer from uneven screen brightness during use, which affects the display effect. Summary of the Invention

[0005] This application provides a display module and a head-up display to improve the display effect of the screen during use.

[0006] In a first aspect, embodiments of this application provide a display module, including a screen that is tilted, a light source assembly, and a lens assembly disposed between the screen and the light source;

[0007] The lens assembly includes a polarizing lens. One side of the polarizing lens is concave as the light-incident surface, and the other side of the polarizing lens is convex as the light-outceasing surface. The polarizing lens is positioned opposite to the light source on the light source assembly and is used to guide the light emitted by the light source at different positions from the light-incident surface to the target position on the screen from the light-outceasing surface.

[0008] The target location is determined based on the screen's tilt angle.

[0009] In one possible implementation, the polarizing lenses positioned opposite the light sources at different locations are different, and the polarizing directions of the different polarizing lenses are different.

[0010] In one possible implementation, the position of the light source on the light source assembly is determined based on the height of the light source in the direction of screen tilt.

[0011] In one possible implementation, at least one polarizing lens is provided for each light source located at the same position.

[0012] In one possible implementation, when there is one polarizing lens corresponding to a light source at the same position, the polarizing lens is a strip lens, and the number of polarizing lenses is the same as the number of groups of light sources at different positions.

[0013] In one possible implementation, there are two or more lens assemblies, which are arranged sequentially between the screen and the light source assembly.

[0014] In one possible implementation, an optical film is provided between the screen and the lens assembly, and the optical film is arranged parallel to the screen or the light source assembly.

[0015] In one possible implementation, the target location is also determined based on the distance between the screen and the light source assembly.

[0016] Secondly, embodiments of this application provide a head-up display, including a display module.

[0017] In one possible implementation, the head-up display further includes a reflective component disposed opposite to the screen for reflecting light emitted from the screen onto the surface to be reflected.

[0018] The display module and head-up display provided in this application embodiment use a polarizing lens to adjust the polarization of light sources at different positions, thereby projecting light sources at different positions onto a target position determined according to the tilt angle of the screen. This improves brightness uniformity by optimizing the propagation path of light on the screen, thereby enhancing the display effect of the screen during use. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] Figure 1 This is a schematic diagram of the optical path of an existing display module provided in this application;

[0021] Figure 2 This is a schematic diagram of the structure of the display module provided in this application;

[0022] Figure 3 This is a schematic diagram of the structure of a head-up display provided in an embodiment of this application.

[0023] Figure label:

[0024] 110 - Light source; 120 - Lens group; 130 - Optical film; 140 - Display screen;

[0025] 210 - Screen; 220 - Light source assembly; 221 - Light source; 230 - Lens assembly; 231 - Polarizing lens; 240 - Optical film;

[0026] 310 - Display module; 320 - Reflective component; 321 - Reflector; 330 - Dust cover; 340 - Windshield.

[0027] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0029] First, let me explain the terms used in this application:

[0030] The screen in question can refer to a TFT-LCD screen, which (Thin Film Transistor Liquid Crystal Display) is used in devices such as monitors, televisions, mobile phones, and tablets. It achieves high-quality image display by precisely controlling the brightness and color of each pixel through an array of thin-film transistors positioned on both sides of a liquid crystal layer. TFT-LCD screens are characterized by high resolution, high contrast, and fast response time, providing a clear and stable visual experience.

[0031] A polarizing lens is a specially designed lens that, in this embodiment, can change the angle of light transmission. A light source component is a crucial part of any light-emitting device used to generate and control light output. It typically consists of multiple components, each with a specific function to ensure the light source functions as intended.

[0032] A light source is a physical device or material that generates light. Light sources may include fluorescent lamps, LEDs (light-emitting diodes), and lasers. In this embodiment, the light source may be an LED.

[0033] A PCB (Printed Circuit Board) is a fundamental component in electronic devices used to support and connect electronic components. It achieves electrical connections by etching conductive paths, pads, and other features onto an insulating substrate, allowing current to flow along designated paths.

[0034] Figure 1 The optical path diagram of the existing display module provided in this application is as follows: Figure 1 As shown, the existing display module includes: a light source 110, a lens group 120, an optical film 130, and a display screen 140, wherein:

[0035] The light source 110 can be used to provide the necessary light. It can affect the brightness and color characteristics of the final image. The selection of the light source 110 depends on the specific requirements of the application, such as brightness level, color temperature, and lifespan.

[0036] Lens group 120, positioned after the light source, is used to control the direction and intensity distribution of light. Through precise design of the lens group 120, focusing, diffusion, or other special effects on light can be achieved to meet the lighting needs of different scenarios. In this embodiment, the lens group 120 can filter and process the light, thereby improving the display effect.

[0037] Optical film 130 is used to improve the performance of an optical system, such as increasing uniformity, altering light intensity distribution, reducing reflection loss, improving system optical efficiency, or changing the color properties of light. This, in turn, enhances the visual experience.

[0038] Display screen 140 is used to display the final image information.

[0039] In the prior art illustrated in this application, to reduce the influence of stray light, the screen is typically tilted at a certain angle, making the actual illumination surface a tilted plane. However, this design results in lower brightness at the end of the screen furthest from the light source and higher brightness at the end closer to the light source. This causes uneven brightness in the virtual image projected by the HUD, thus affecting the overall projection display quality.

[0040] This application provides a display module and a head-up display. By using a polarizing lens to polarize light sources at different positions (i.e., adjusting the propagation angle of the light), the propagation path of the light is optimized for a target position determined by the screen's tilt angle. This balances the brightness of different areas of the screen, effectively improving brightness uniformity and significantly enhancing the display effect during use.

[0041] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0042] Figure 2 A schematic diagram of the display module provided in this application is shown below. Figure 2 As shown, the display module includes: a screen 210 tilted, a light source assembly 220, and a lens assembly 230 disposed between the screen 210 and the light source 221; wherein, the light source assembly 220 is provided with a plurality of light sources 221. In this embodiment, the light source assembly 220 can be a PCB board, and the light sources 221 can be LEDs on the PCB board, wherein there can be a plurality of LEDs.

[0043] The lens assembly 230 includes a polarizing lens 231. One side of the polarizing lens 231 is concave as an incident light surface for receiving light emitted from the light source 221, and the other side of the polarizing lens 231 is convex as an exit light surface for projecting the received light onto the screen 210. In this embodiment, the polarizing lens 231 is disposed opposite to the light source 221. Multiple polarizing lenses 231 can be used to guide light emitted from the light source 221 at different locations from the incident light surface and guide it from the exit light surface to the target position on the screen 210.

[0044] The target position of screen 210 can be determined based on the tilt angle of screen 210, for example, Figure 2 As shown in the screen 210, the target position of the screen 210 is higher when the upper part of the screen 210 is tilted to the left, and the target position of the screen 210 is lower when the upper part of the screen 210 is tilted to the right.

[0045] Therefore, the display module provided in this application embodiment can effectively adjust the distribution of light on the screen 210 by projecting light onto the target position of the screen 210 through the polarizing lens 231, reduce the uneven brightness caused by the tilt of the screen 210, and improve the overall brightness uniformity and visual effect.

[0046] In this embodiment of the application, in order to better guide the light emitted by the light source 221 at different positions to the screen 210, the polarizing lens 231 set relative to the light source 221 at different positions is different, and the polarization direction of the different polarizing lens 231 is different.

[0047] The polarizing direction of the polarizing lens 231 can be used to optimize and adjust the propagation path of light projected onto the tilted screen 210 from light sources 221 at different positions, so as to improve brightness uniformity and display effect.

[0048] The polarizing direction of the polarizing lens 231 can be different, referring to the different angles of the polarizing direction at different positions. In some embodiments, the angle of the polarizing direction of the polarizing lens 231 can be determined based on the width of the screen 210, the tilt angle of the screen 210, and the distance between the screen 210 and the light source 221. The width of the screen 210 determines the size of the area to be covered. A wider screen may require more light to maintain brightness uniformity. The tilt angle of the screen 210 affects the angle at which light reaches the screen. A larger tilt angle results in a greater change in the angle of incidence of light, potentially leading to uneven brightness. Regarding the distance from the light source 221 to the screen 210: a shorter distance results in a shorter light propagation path but a larger angle change; a longer distance results in a longer light propagation path but a smaller angle change, making it easier to control brightness uniformity.

[0049] Therefore, the smaller the tilt angle of the screen 210 and the distance from the light source component 220 to the screen 210, the larger the angle of the polarization direction of the polarizing lens 231; and the larger the tilt angle of the screen 210 and the distance from the light source component 220 to the screen 210, the smaller the angle of the polarization direction of the polarizing lens 231.

[0050] Specifically, based on the width of screen 210 and the tilt angle of screen 210, the projected length of the width of screen 210 in the direction perpendicular to light source 221 and the projected length of the width of screen 210 in the direction parallel to light source 221 can be determined. Therefore, the distribution of light on screen 210 can be determined.

[0051] For example, if the screen tilt angle is large, the projected length of the screen 210 width in the direction perpendicular to the light source 221 will be smaller, while the projected length of the screen 210 width in the direction parallel to the light source 221 will be larger. This means that more light will be concentrated on one side of the screen, which may lead to uneven brightness. Conversely, a smaller tilt angle will cause the projected length of the screen 210 width in the direction perpendicular to the light source 221 to be larger, making the light more evenly distributed across the entire screen.

[0052] A large projection length of the screen 210 width in the direction parallel to the light source 221 may cause image distortion or deterioration in certain areas. Specifically, based on the width of the screen 210 and the tilt angle of the screen 210, the projection length of the screen 210 width in the direction perpendicular to the light source 221 satisfies: L1 = W * cos(θ); the projection length of the screen 210 width in the direction parallel to the light source 221 satisfies: L2 = W * sin(θ).

[0053] The distance from the farthest point of the light source 221 to the screen 210 can be determined based on the projected length of the screen 210 width in the direction parallel to the light source 221, and the distance between the screen 210 and the light source 221.

[0054] The farthest point refers to the longest path of light from the light source to the edge of the screen. This position is usually located in one corner of the screen, but the exact location depends on the screen's tilt angle and width.

[0055] For example, when the projected length of the screen 210 in the direction parallel to the light source 221 is L2, the distance between the screen 210 and the light source 221 is D, and the tilt angle of the screen 210 is... At that time, the distance H from the light source 221 to the farthest point of the screen 210 satisfies: .

[0056] The angle of the polarization direction of the polarizing lens 231 can be determined based on the projection length of the screen 210 width in the direction perpendicular to the light source 221 and the distance from the light source 221 to the farthest point of the screen 210.

[0057] The angle of the polarization direction of the polarizing lens 231 can satisfy:

[0058]

[0059] in, This can refer to the angle of the polarization direction of the polarizing lens 231. This could refer to the tilt angle of the screen (210). It could refer to a screen width of 210 pixels. This can refer to the distance between screen 210 and light source 221.

[0060] In this embodiment, the position of the light source 221 on the light source assembly 220 is determined based on the height of the light source 221 along the tilt direction of the screen 210. The height of the light source 221 along the tilt direction of the screen 210 can refer to the projected height of the light source 221 in the tilt direction of the screen 210, that is, the height of the light source 221 in the direction perpendicular to the bottom edge of the screen 210. For example, as... Figure 2 As shown, the top of the screen 210 is tilted to the left, and the tilt direction of the screen 210 can be pointed from the lower right to the upper left; when the top of the screen 210 is tilted to the left front, the tilt direction of the screen 210 can be pointed from the lower right rear to the upper left front.

[0061] Light sources 221 that are in the same position on the light source assembly 220 can refer to light sources 221 that are at the same height along the tilt direction of the screen 210, while light sources 221 that are not in the same position on the light source assembly 220 can refer to light sources 221 that are at different heights along the tilt direction of the screen 210.

[0062] Therefore, based on the light sources 221 at different positions, the distance between the screen 210 and the light sources 221 can be determined. Then, based on the width of the screen 210 and the tilt angle of the screen 210, the angle of the polarization direction of the polarizing lens 231 relative to the light sources 221 at different positions can be determined. For example, when the width of the screen 210... The tilt angle of the screen is 10cm and 210 degrees. The angle is 30°, and the distance between the screen 210 and the light source 221 is... If it is 10cm, then we can determine:

[0063] ;

[0064] ;

[0065]

[0066]

[0067] Converting 0.577 to degrees, we get 0.577*180 / Π≈0.577*57.2958≈33.1°.

[0068] thus, Therefore, it can be The value is 30°.

[0069] In this embodiment, each polarizing lens 231 can correspond to one light source 221, or it can correspond to multiple light sources 221 located at the same position. When each polarizing lens 231 corresponds to one light source 221, and the light sources 221 are arranged in a row, the polarizing lenses 231 are also arranged in a row. When one polarizing lens 231 can correspond to multiple light sources 221 located at the same position, the polarizing lens 231 can be a strip lens, and the number of polarizing lenses 231 is the same as the number of groups of light sources 221 located at different positions. That is, in use, the arrangement of the polarizing lenses 231 is not limited to any particular form; it can be an array of single lenses or a group of strip lenses, and the number can take many forms.

[0070] For example, when the light source assembly 220 is a PCB board, the light source 221 consists of 15 LEDs arranged in an array of 3 rows and 5 columns on the PCB board. Along the tilt direction of the screen 210, the 15 light sources 221 can be divided into three groups, meaning light sources 221 in the same row form a group with the same position. When the polarizing lens 231 is a single lens, there can be 15 polarizing lenses 231, each corresponding to one of the 15 light sources 221. When the polarizing lens 231 is a strip lens, there can be three polarizing lenses 231, each corresponding to 5 light sources 221. Alternatively, if there are more than three polarizing lenses 231, each polarizing lens 231 can correspond to at least two light sources 221.

[0071] In this embodiment, the polarizing lens 231 can be a single optical lens layer or a combination of multiple polarizing lenses 231, meaning there can be two or more lens assemblies 230, sequentially arranged between the screen 210 and the light source 221. Since each polarizing lens 231 on each lens assembly 230 can have different polarization directions and characteristics, the sequential arrangement of the lens assemblies 230 ensures that light, traveling from the light source 221 to the screen 210, passes through each lens assembly 230 sequentially, undergoing multiple adjustments. This effectively filters out unnecessary reflected and scattered light, reduces stray light, and improves image contrast and clarity. Simultaneously, the multiple polarizing lenses 231 optimize the light distribution on the screen 210, ensuring more uniform brightness across different areas of the screen 210, thereby improving the overall display effect. This enhances the system's optical performance, improves its reliability and flexibility, and ultimately provides a high-quality display.

[0072] In this embodiment, an optical film 240 is provided between the screen 210 and the lens assembly 230, and the optical film 240 is arranged parallel to the screen 210 or the light source assembly 220.

[0073] Optical film 240 can refer to a special thin-film material that can be used in various optical devices and display technologies, such as liquid crystal displays (LCDs), organic light-emitting diode (OLED) displays, projectors, and automotive head-up display (HUD) systems. Optical film 240 can optimize light transmission efficiency, brightness, contrast, and color performance by adjusting and controlling the light propagation path, thereby improving display quality and visual experience.

[0074] In this embodiment, by setting an optical film 240 between the screen 210 and the light source 221, precise control of light can be achieved. For example, a polarizing film can reduce the influence of stray light and improve image contrast; a brightness enhancement film can increase the overall brightness of the screen 210, making the image brighter; and a diffusion film can ensure a more uniform distribution of light on the screen 210, avoiding uneven brightness. Therefore, not only can the propagation path of light be optimized, but the display effect can also be significantly improved, providing a clearer, more uniform, and higher-contrast virtual image, thereby enhancing the user's visual experience. In this embodiment, the target position is also determined based on the distance between the screen 210 and the light source assembly 220.

[0075] The distance between screen 210 and light source assembly 220 can refer to the distance from the light source 221 to the nearest end of screen 210. This distance has a significant impact on the distribution of light on screen 210, determining the time and path length of light propagating from light source 221 to screen 210, thereby affecting the landing point and distribution of light on screen 210.

[0076] In this embodiment, when the distance between the screen 210 and the light source assembly 220 is short, the propagation path of light from the light source 221 to the screen 210 is short, and the light is more easily concentrated in a small area. Therefore, in order to ensure that the light is evenly distributed across the entire screen 210, the target position can be adjusted slightly downwards or towards the center to avoid the light being too concentrated on the upper part of the screen 210 or in a specific area.

[0077] When the distance between the screen 210 and the light source component 220 is long, the propagation path of light from the light source 221 to the screen 210 is longer, and the light is more easily diffused. Therefore, in order to ensure that the light is evenly distributed on the entire screen 210, the target position can be adjusted slightly upward or towards the center to avoid the light being too dispersed, resulting in insufficient brightness in some areas of the screen 210.

[0078] Therefore, the display module provided in this application embodiment uses the polarizing lens 231 to adjust the polarization of the light source 221 at different positions, so as to project the light source 221 at different positions onto the target position determined according to the tilt angle of the screen 210, thereby optimizing the propagation path of light on the screen 210 to improve brightness uniformity and thus improve the display effect of the screen 210 when in use.

[0079] Figure 3 This is a schematic diagram of the structure of the head-up display provided in the embodiments of this application, such as... Figure 3 As shown, the head-up display includes: a display module 310, a reflective component 320, and a dust cover 330.

[0080] The display module 310 includes a light source assembly, a lens assembly, an optical film 240, and a TFT-LCD screen. The display module 310 uses a polarizing lens to adjust the polarization of light sources at different positions, thereby projecting light sources at different positions onto a target position determined by the tilt angle of the screen. This optimizes the propagation path of light on the screen to improve brightness uniformity and thus improve the display effect of the screen during use.

[0081] The reflective component 320 includes a reflector 321 for reflecting light from the display module 310 to the outside. In this embodiment, the reflector 321 can be set arbitrarily according to the needs of use. For example, the number of reflectors 321 can be multiple or one.

[0082] The dust cover 330 is used to protect the internal optical components of the head-up display from dust entering and interfering with image quality.

[0083] In this embodiment, the head-up display (HUD) can reflect images onto the windshield 340, where the windshield 340 serves as the imaging medium and can be positioned opposite the HUD. The driver's eyes observe the projected image information through the windshield 340. It should be noted that the imaging medium of the HUD can also be other media, such as the dashboard inside the vehicle.

[0084] In this embodiment of the head-up display, the image generation unit first creates the image data to be displayed and then transmits it to the display module 310. Light emitted from the display module 310 is reflected by the first reflector 321, then further reflected by the second reflector 321, and finally reaches the windshield 340. The light reaching the windshield 340 can form a virtual image, which the driver sees through the windshield 340.

[0085] Therefore, the head-up display provided in this application embodiment improves the brightness uniformity of the TFT-LCD panel in an tilted state. In a head-up display (HUD) system, the brightness uniformity of the image displayed on the TFT-LCD is crucial to the quality of the virtual image seen by the driver. This improvement effectively avoids the problem of HUD projection virtual image quality caused by uneven brightness, ensuring that the driver obtains a clearer and more uniform visual experience, thereby improving driving safety and comfort.

[0086] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0087] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A display module, characterized in that, It includes a screen that is tilted, a light source assembly, and a lens assembly disposed between the screen and the light source; The lens assembly includes a polarizing lens. One side of the polarizing lens is concave as the light-incident surface, and the other side of the polarizing lens is convex as the light-outceasing surface. The polarizing lens is arranged opposite to the light source on the light source assembly and is used to guide the light emitted by the light source at different positions from the light-incident surface to the target position of the screen through the light-outceasing surface. The target position is determined based on the tilt angle of the screen.

2. The display module according to claim 1, characterized in that, The polarizing lenses positioned opposite the light sources at different locations are different, and the polarizing directions of the different polarizing lenses are different.

3. The display module according to claim 2, characterized in that, The angle of the polarization direction of the polarizing lens is determined based on the screen width, the screen tilt angle, and the distance between the screen and the light source.

4. The display module according to claim 1, characterized in that, The position of the light source on the light source assembly is determined based on the height of the light source along the tilt direction of the screen.

5. The display module according to claim 4, characterized in that, At least one polarizing lens is provided for each light source located in the same position.

6. The display module according to claim 5, characterized in that, When there is one polarizing lens corresponding to the light source in the same position, the polarizing lens is a strip lens, and the number of polarizing lenses is the same as the number of groups of light sources in different positions.

7. The display module according to claims 1-6, characterized in that, There are two or more lens assemblies, which are arranged sequentially between the screen and the light source assembly.

8. The display module according to claims 1-6, characterized in that, An optical film is provided between the screen and the lens assembly, and the optical film is arranged parallel to the screen or the light source assembly.

9. The display module according to claims 1-6, characterized in that, The target location is also determined based on the distance between the screen and the light source component.

10. A heads-up display, characterized in that, The display module includes any one of claims 1-9.

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