Display device and HUD device having the same

Abstract

The application provides a display device which can improve the light utilization rate of a backlight source. Furthermore, the application also provides a HUD device with the display device. The display device comprises a frame, a display screen installed on one side of the frame, a backlight source arranged on the other side of the frame and emitting light to the display screen, a shell with one end installed on the frame and the other end installed on the backlight source, a reflection surface formed in the shell, the backlight source and the back surface side of the display screen being opposite in the space surrounded by the shell, and a reflection member arranged in the space surrounded by the shell and covering the unnecessary display area in the design display area of the display screen, the reflection member being opposite to the reflection surface.

Description

Technical Field

[0001] This invention relates to the field of display device technology, and more particularly to a display device and a HUD device having the same. Background Technology

[0002] As vehicles such as cars become increasingly sophisticated, HUD (Head-Up Display) devices are also being used in them. As in-vehicle HUDs, besides replacing the instrument panel and displaying various information (such as speed, tire pressure, fuel consumption, speed limits, warnings, etc.), they can also display navigation, driver assistance, and autonomous driving information previously displayed on the central multimedia screen. This allows drivers to almost completely avoid looking down while driving, greatly improving driving safety.

[0003] However, under sunlight or strong light sources, the display content of a HUD device may be interfered with, making it difficult for the driver to see clearly. Therefore, it is necessary to improve the light utilization efficiency of the backlight to enhance the brightness of the HUD display content and reduce the interference of ambient light on the display content to some extent. To improve the light utilization efficiency of the backlight, known solutions typically involve placing complex light-collecting components between the backlight and the display screen, resulting in a relatively complex optical path. Summary of the Invention

[0004] This invention aims to at least partially solve one of the known technical problems. To this end, a display device is proposed that improves the light utilization efficiency of the backlight. Furthermore, this invention also proposes a head-up display (HUD) device incorporating this display device.

[0005] According to a first aspect of the present invention, a display device includes: a frame; a display screen mounted on one side of the frame; a backlight source disposed on the other side of the frame and emitting light onto the display screen; a housing, one end of which is mounted to the frame, the backlight source being mounted to the other end of the housing, a reflective surface being formed inside the housing, the backlight source and the back side of the display screen facing each other within a space surrounded by the housing; and a reflector disposed within the space surrounded by the housing and covering an unwanted display area within the designed display area of ​​the display screen, the reflector facing the reflective surface.

[0006] Beneficial effects

[0007] The display device of the first aspect of the present invention can improve the light utilization rate of the backlight.

[0008] In some embodiments, the frame has a first opening in the middle; the display screen has non-display areas around its perimeter, the non-display areas surrounding the designed display area; the display screen is mounted to the frame in the non-display areas, and the designed display area is exposed in the first opening.

[0009] In some embodiments, the reflector is attached to the back of the display screen and covers the area that is not intended for display.

[0010] In some embodiments, the design display area is a rectangular area, and the reflector covers one long side or one short side of the design display area, or the reflector surrounds the design display area and covers the four edges of the design display area.

[0011] In some embodiments, a cover plate is also included, which is mounted to the frame from the front side of the display screen; the cover plate is formed with a shielding portion that shields an unwanted display area in the designed display area of ​​the display screen.

[0012] In some embodiments, the reflector is a reflective film.

[0013] In some embodiments, the reflective surface includes a first reflective surface formed on the inner wall of the housing, and / or a second reflective surface formed on the bottom of the housing.

[0014] In some embodiments, the housing is formed such that its cross-section gradually increases from one side of the backlight towards one side of the frame.

[0015] In some embodiments, the frame is rectangular and has a rectangular first opening in the middle; the housing has four flat sidewalls that are connected to each other to define the rectangular cross-section.

[0016] The housing has a rectangular second opening at one end that is mounted to the frame, and the second opening is symmetrically opposite to the first opening.

[0017] In some embodiments, the housing is made of a reflective material, or a reflective layer is formed on the inner wall surface, or a reflective device is installed on the inner wall surface.

[0018] In some embodiments, the backlight includes a mounting plate that is mounted to the bottom of the housing, and the second reflective surface is formed on the mounting plate.

[0019] In some embodiments, at least one of a diffuser, a light-concentrating element, and a light guide element is also included, sandwiched between the display screen and the housing.

[0020] According to a second aspect of the present invention, the HUD device has the display device described in any of the above claims.

[0021] Beneficial effects

[0022] The HUD device of the second aspect of the present invention can enhance the brightness of the displayed content of the HUD device as a whole because the display device can improve the light utilization rate of the backlight. Attached Figure Description

[0023] Figure 1 This is a perspective view of one embodiment of the display device of the present invention.

[0024] Figure 2 yes Figure 1 The sectional view at point AA.

[0025] Figure 3 This is a cross-sectional schematic diagram of one embodiment of a HUD device having the display device of the present invention.

[0026] Explanation of reference numerals in the attached figures

[0027] 100: Display device; 101: Frame; 102: Display screen; 103: Backlight; 104: Housing; 104a: Side wall; 105: Reflector; 106: Inner wall surface; 107: Designed display area; 107a: Actual display area; 107b: Area not required for display; 108: First opening; 109: Non-display area; 110: Cover plate; 111: Obstruction part; 112: Clearance groove; 113: Second opening; 114: Mounting plate; 115: LED light; 116: Mounting surface; 117: Diffuser; 118: Focusing element; 119: Reflective surface; 119a: First reflective surface; 119b: Second reflective surface; 200: HUD device; 201: Housing; 202: Optical components; 203: Receiving cavity; 204: Window; 205: Reflector; 206: Lens. Detailed Implementation

[0028] The embodiments of this implementation are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this implementation, and should not be construed as limiting this implementation.

[0029] In the description of this embodiment, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this embodiment.

[0030] In the description of this embodiment, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this embodiment, unless otherwise explicitly limited, terms such as setting, installing, and connecting should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this embodiment in conjunction with the specific content of the technical solution.

[0032] Reference Figure 1 as well as Figure 2 The display device 100 according to the first embodiment includes: a frame 101, a display screen 102, a backlight 103, a housing 104, and a reflector 105. The display screen 102 is mounted on one side of the frame 101. The backlight 103 is disposed on the other side of the frame 101 and emits light to the display screen 102. One end of the housing 104 is mounted to the frame 101, and the backlight 103 is mounted to the other end of the housing 104. A reflective surface 119 is formed inside the housing 104. The backlight 103 and the back side of the display screen 102 face each other within the space surrounded by the housing 104. The reflector 105 is disposed within the space surrounded by the housing 104 and covers a portion of the designed display area 107 of the display screen 102. The reflector 105 faces the reflective surface 119. It should be noted that the term "relative" as described in the embodiments refers to the two being relative to each other in the light propagation path. For example, if the light reflected by the reflector 105 can at least partially directly illuminate the reflective surface 119, the reflector 105 and the reflective surface 119 can be considered to be relative, rather than limited to the case where they are parallel to each other. Thus, the light emitted by the backlight 103 towards the back side of the display screen 102 partially illuminates the reflector 105, and the light reflected by the illuminated member 105 illuminates the reflective surface 119 inside the housing 104 again, and then illuminates the back side of the display screen 102 again through the reflective surface 119.

[0033] The display device 100 of this embodiment can improve the light utilization efficiency of the backlight 103. Specifically, the size and structure of the HUD device 200 used in automobiles (described later) may vary depending on the car model, etc. However, due to the complexity of the production line for the display screen 102 (e.g., a liquid crystal display), it is difficult to configure independent, non-standard display screens 102 for each of these differently shaped HUD devices 200. Therefore, when assembling the HUD device 200, a larger display screen 102 is usually used, and then a portion of the designed display area 107 of the display screen 102 is covered to prevent the backlight 103 from directly shining on these areas that do not need to be displayed. In this embodiment, by using the reflector 105 to cover the unused display area 107b of the display screen 102, not only can the size of the display screen be controlled according to the actual needs of the HUD device 200, but also the light source that shines on these unused designed display areas 107 can be reflected back, and then the light utilization efficiency of the backlight 103 can be improved by reusing the housing 104 with the reflective surface 119. The frame 101 of the display device 100 in this embodiment is rectangular. It should be noted that, in this specification, a square is considered as a type of rectangle. The frame 101 has a rectangular first opening 108 in the center. The frame 101 can be formed, for example, by injection molding from resin.

[0034] The display screen 102 is generally rectangular. From a design perspective, the display screen 102 has non-display areas 109 around its four edges, surrounding the designed display area 107 (i.e., the area originally present in the display screen 102). The display screen 102 is mounted to the frame 101 in the non-display areas 109, with the designed display area 107 exposed in the first opening 108. The display screen 102 can be attached to the front side of the frame 101, for example, using adhesives such as glue or tape. Alternatively, the display screen 102 can also be mounted to the front side of the frame 101 using various mounting methods such as snap-fit ​​or clamping. The length and width dimensions of the designed display area 107 can be the same as the length and width dimensions of the first opening 108 of the frame 101.

[0035] Additionally, the display device 100 may also have a cover plate 110, which is mounted to the frame 101 from the front side of the display screen 102. The cover plate 110 has a shielding portion 111 that shields an unwanted display area 107b within the designed display area 107 of the display screen 102. For example, a through rectangular clearance groove 112 is formed in the center of the cover plate 110. The length and width of the clearance groove 112 may be the same as the length and width of the actual display area 107a to be displayed on the display screen 102 of the specific HUD device 200. In other words, at least one of the length and width of the clearance groove 112 of the cover plate 110 is smaller than the length and width of the designed display area 107 that the display screen 102 can display. The cover plate 110 is mounted to the frame 101 from the front side of the display screen 102, thereby covering the unwanted display area 107b within the designed display area 107 of the display screen 102. The cover plate 110 can be installed onto the frame 101 by various known methods such as adhesive bonding, screw connection, and snap-fit ​​connection.

[0036] The reflector 105 is attached to the back of the display screen 102 and covers a portion of the designed display area 107 of the display screen 102, specifically the unwanted display area 107b within the designed display area 107 of the display screen 102. When viewed from the front, the position of the reflector 105 overlaps with the blocking portion 111 in the cover plate 110 that covers the unwanted display area 107b of the display screen 102. In other words, when it is necessary to reduce the designed display area 107 of the display screen 102, the backlight 103 is blocked from the back side of the display screen 102 by the reflector 105, and the position of the display screen 102 corresponding to the reflector 105 is blocked from the front side of the display screen 102 by the cover plate 110. Thus, the designed display area 107 of the display screen 102 is reduced.

[0037] The display area 107 of the display screen 102 is a rectangular area, and the reflector 105 covers one long side or one short side of the display area 107. It should be noted that when the display area 107 is square, any edge of the display area 107 can be considered either a long or short side. For example, when the display image of a specific HUD device 200 only needs to use the width of the display area 107 of the display screen 102, the reflector 105 covers one long side of the display area 107. When the display image of the HUD device 200 only needs to use the length of the display area 107 of the display screen 102, the reflector 105 covers one short side of the display area 107. Furthermore, when the display image of the HUD device 200 requires the entire display area 107a of the display screen 102 to be reduced, the reflector 105 surrounds the display area 107 and covers its four edges, thereby forming a reduced-length and reduced-width display area 107a.

[0038] The reflective element 105 can be a reflective film, which is directly attached to the back of the display screen 102. The reflective film can be either a soft film or a hard film. Alternatively, the reflective element 105 can be a total reflection film. The material of the reflective film is not particularly limited; for example, it can be various forms of reflective film such as acrylic reflective film, ABS reflective film, aluminized reflective film, PVC reflective film, and PET reflective film.

[0039] The reflective surface 119 formed inside the housing 104 can reflect light from the backlight 103 and light reflected from the reflector 105. For example, the housing 104 has four flat sidewalls 104a, which are connected to each other to define a rectangular cross-section. Furthermore, the cross-section of the housing 104 can be formed to gradually increase from the side of the backlight 103 toward the side of the frame 101. A rectangular second opening 113 is formed at the end of the housing 104 that is mounted to the frame 101, and the second opening 113 is symmetrically opposite to the first opening 108. For example, the length and width of the second opening 113 are the same as the length and width of the first opening 108, respectively. When the housing 104 is mounted to the frame 101, the second opening 113 and the first opening 108 transition smoothly, thereby improving the light reflection capability of the housing 104.

[0040] The reflective surface 119 inside the housing 104 may include a first reflective surface 119a formed on the inner wall surface 106 of the four side walls 104a of the housing and a second reflective surface 119b formed on the bottom of the housing.

[0041] The first reflective surface 119a can be formed as follows: For example, the material of the housing 104 can be a reflective material, such as mirror stainless steel or high-purity aluminum plate. Alternatively, a reflective layer can be formed on the inner wall 106 of the housing 104. This reflective layer can be attached to the inner wall 106 of the housing 104 by means of a coating, such as aluminum plating, silver plating, or gold plating on the inner wall 106 or the entire housing 104. Alternatively, a reflective device (not shown) can be mounted on the inner wall 106. This reflective device can use the same material as the reflector 105 attached to the back of the display screen 102. For example, the reflective device can be a reflective film, which is attached to the inner wall 106 of the housing 104 by a film application. This improves the reflectivity of the inner wall 106 of the housing 104, thereby increasing the light utilization rate of the backlight 103.

[0042] The backlight 103 includes a mounting plate 114 and multiple LEDs 115 mounted on the mounting plate 114. The mounting plate 114 of the backlight 103 can be mounted to the housing 104 using various mounting methods such as screws or clips. The mounting plate 114 of the backlight 103 can be mounted parallel to the display screen 102 at the bottom of the housing 104. With the mounting plate 114 of the backlight 103 mounted at the bottom of the housing 104, the LEDs 115 are surrounded by the housing 104, allowing the light emitted from the LEDs 115 to directly illuminate the display screen 102. Furthermore, the diffused light, after being reflected by the inner wall 106 of the housing 104, can more concentratedly illuminate the display screen 102, thereby improving the light utilization rate of the backlight 103.

[0043] Furthermore, the side of the housing 104 where the backlight 103 is mounted can be open to facilitate the mounting of the backlight 103. The mounting plate 114 of the backlight 103 is mounted to the bottom of the housing 104. The second reflective surface 119b can be formed as follows: the mounting plate 114 can be made of materials such as mirror stainless steel or high-purity aluminum plate; alternatively, reflective material can be attached to the mounting surface 116 of the mounting plate 114, or a reflective film layer can be formed. That is, the mounting surface 116 of the mounting plate 114 of the backlight 103 for mounting LED lights 115 is designated as the second reflective surface 119b.

[0044] Additionally, the display device 100 of the embodiment may also include at least one of a diffuser 117, a light-focusing member 118, and a light guide (not shown) sandwiched between the display screen 102 and the housing 104. For example, the display device 100 of the embodiment may include a diffuser 117 sandwiched between the display screen 102 and the housing 104. For example, the diffuser 117 may be attached to one side of the frame 101 located on the housing 104 and positioned between the backlight 103 and the display screen 102. Furthermore, the display device 100 of the embodiment may also include a light-focusing member 118 sandwiched between the diffuser 117 and the backlight 103. By providing the diffuser 117, the uniformity and quality of the displayed image on the display screen 102 can be improved. Furthermore, by providing the light-focusing member 118, the light emitted by the backlight 103 can be precisely controlled and guided. Alternatively, the display device 100 in this embodiment may also include a light guide (not shown) disposed between the display screen 102 and the housing 104. These optical devices can be used individually or in combination.

[0045] In the display device 100 of the embodiment, by using the reflector 105 to cover a portion of the designed display area 107 of the display screen 102 (i.e., the non-display area 107b), not only can the size of the display screen be controlled according to the actual needs of the HUD device 200, but also the light source that shines on these non-display designed display areas 107 can be reflected back and then the light utilization rate of the backlight 103 can be improved by reusing the housing 104 with the reflective surface 119.

[0046] In the display device 100 of the embodiment, by attaching a reflective film to the back of the display screen 102, the area that does not need to be displayed in the designed display area 107 of the display screen 102 can be easily covered. Furthermore, by providing a cover plate 110 mounted to the frame 101 from the front side of the display screen 102, and by having the covering portion 111 of the cover plate 110 cover the area 107 that does not need to be displayed in the designed display area 107 of the display screen 102, the area that needs to be displayed can be precisely defined.

[0047] Furthermore, by attaching a reflective film to the back of the display screen 102, the difficulty and cost of the assembly process can be reduced. For example, the reflective film can be attached during the manufacturing process of the display screen 102 without the need for additional complex assembly processes.

[0048] In the display device 100 of the embodiment, by making the cross-section of the housing 104 gradually increase from the side of the backlight 103 toward the side of the frame 101, a reflective surface 119 (first reflective surface 119a) can be easily formed on the inner wall surface 106 of the housing 104. Furthermore, the first reflective surface 119a can reflect not only light from the backlight 103, but also light reflected from the reflector 105, thereby further improving the light utilization rate of the backlight 103.

[0049] Furthermore, while the example of frame 101 being rectangular has been given above, it is not limited to this. Frame 101 can be set to a circular shape, an elliptical shape, or various irregular shapes, depending on the actual needs of the product.

[0050] While the above example illustrates a rectangular shape for the actual usable area 107a, it is not limited to this. The actual usable area 107a can also be set to a circular, elliptical, or various irregular shapes, depending on the needs of the actual product.

[0051] While the above description illustrates that reflective element 105 is an example of a reflective film, it is not limited to this. Reflective element 105 can also be a reflector, which is mounted on frame 101 and roughly adheres to the back side of display screen 102. The material of the reflector is not particularly limited; for example, it can be various materials capable of reflecting light, such as mirrored stainless steel or high-purity aluminum plate.

[0052] Furthermore, although the example described above is of the reflector 105 being attached to the back side of the display screen 102, it is not limited to this. The reflector 105 may also be mounted on the frame 101 and block the unwanted display area 107b in the designed display area 107 of the display screen 102 along the direction in which the display screen 102 and the backlight 103 are opposite to each other.

[0053] Furthermore, although an example has been described where the reflective surface 119 includes a first reflective surface 119a formed on the inner wall surface 106 of the housing 104, it is not limited to this. For example, the housing 104 as a whole may also be formed as a rectangular cylinder, in which case the second reflective surface 119b may be formed only at the bottom of the housing 104, and the second reflective surface 119b mainly reflects light reflected from the reflector 105.

[0054] Alternatively, although the above example illustrates an example where the reflective surface 119 includes a second reflective surface 119b formed at the bottom of the housing 104, it is not limited to this. For example, the reflective surface 119 may also have a first reflective surface 119a formed only on the inner wall surface 106 of the housing 104.

[0055] While the example described above illustrates a parallel relationship between the mounting plate 114 of the backlight 103 and the display screen 102, this is not an exception. As long as the light from the backlight 103 can effectively illuminate the back side of the display screen 102, the mounting plate 114 of the backlight 103 can also be tilted at various angles relative to the display screen 102. For example, other light paths can be provided between the mounting plate 114 and the display screen 102, thereby allowing for easy adjustment of the relative positions and angles of the display screen 102 and the backlight 103 according to actual needs.

[0056] Reference Figure 3 The display device 100 of the embodiment can be used in the HUD device 200. Since the display device 100 can improve the light utilization rate of the backlight 103, it can enhance the overall brightness of the display content of the HUD device 200.

[0057] The HUD device 200, as an embodiment of the second embodiment, may have a typical structure of a HUD device, including: a housing 201, an optical component 202, and the aforementioned display device 100. The housing 201 has a receiving cavity 203 and a window 204, the window 204 communicating the receiving cavity 203 with the outside. The display device 100 and the optical component 202 are respectively housed within the receiving cavity 203, and the optical component 202 is located between the window 204 and the display device 100, transmitting display information from the display surface of the display device 100 to the outside of the housing 201 via the window 204.

[0058] The window 204 of the housing 201 faces the windshield of the car. The optical components 202 include, for example, a reflector 205 and a lens 206. The reflector 205 is located below the window 204, and the lens 206 is located, for example, between the reflector 205 and the display device 100. Thus, the display information of the display device 100 is transmitted to the outside of the housing 201 via the window 204.

[0059] Although embodiments of this implementation have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this implementation, the scope of which is defined by the claims and their equivalents.

Claims

1. A display device, characterized in that, include: frame; A display screen is mounted on one side of the frame; A backlight, located on the other side of the frame, emits light to the display screen; A housing, one end of which is mounted to the frame, and a backlight is mounted to the other end of the housing. A reflective surface is formed inside the housing, and the backlight and the back side of the display screen are opposite each other within the space surrounded by the housing. A reflector is disposed within the space surrounded by the housing and covers the unwanted display area within the designed display area of ​​the display screen. The reflector and the reflective surface are opposite each other.

2. The display device according to claim 1, characterized in that, The frame has a first opening in the middle; The display screen has a non-display area around its four edges, and the non-display area surrounds the designed display area; The display screen is mounted to the frame in the non-display area, and the designed display area is exposed in the first opening.

3. The display device according to claim 1, characterized in that, The reflector is attached to the back of the display screen and covers the area that is not intended for display.

4. The display device according to claim 3, characterized in that, The design display area is a rectangular area. The reflector covers one long side or one short side of the design display area, or the reflector surrounds the design display area and covers the four edges of the design display area.

5. The display device according to any one of claims 1 to 4, characterized in that, It also includes a cover plate that is mounted to the frame from the front side of the display screen; The cover plate has a shielding portion that covers the unwanted display area in the designed display area of ​​the display screen.

6. The display device according to any one of claims 1 to 4, characterized in that, The reflective element is a reflective film.

7. The display device according to claim 1, characterized in that, The reflective surface includes a first reflective surface formed on the inner wall of the housing, and / or a second reflective surface formed on the bottom of the housing.

8. The display device according to claim 1 or 7, characterized in that, The housing is formed such that its cross-section gradually increases from one side of the backlight towards one side of the frame.

9. The display device according to claim 8, characterized in that, The frame is rectangular, and the frame has a rectangular first opening in the middle. The housing has four flat sidewalls that are connected to each other to define a rectangular cross-section. The housing has a rectangular second opening at one end that is mounted to the frame, and the second opening is symmetrically opposite to the first opening.

10. The display device according to claim 7, characterized in that, The shell is made of a reflective material, or a reflective layer is formed on the inner wall, or a reflective device is installed on the inner wall.

11. The display device according to claim 7, characterized in that, The backlight includes a mounting plate that is mounted to the bottom of the housing, and the second reflective surface is formed on the mounting plate.

12. The display device according to claim 1, 10, or 11, characterized in that, It also includes at least one of a diffuser, a light-concentrating element, and a light guide element sandwiched between the display screen and the housing.

13. A HUD device, characterized in that, A display device having any one of claims 1 to 12.

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