Projection device and display system
By adjusting the reflectivity of the reflective film on the surface of the light-concentrating component of the projection device, the problem of high brightness at the center and low brightness at the edge of a single LCD projection device is solved, thereby improving the overall uniformity of the projected image.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING BOE DISPLAY TECH CO LTD
- Filing Date
- 2023-05-31
- Publication Date
- 2026-07-24
Smart Images
Figure CN116643444B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of projection technology, and more specifically, to a projection device and a display system. Background Technology
[0002] A projection device is a device that projects images or videos onto a screen. It can be connected to devices such as computers, game consoles, and televisions through various interfaces to play corresponding video signals. Projection devices are widely used in homes, offices, schools, and entertainment venues.
[0003] Currently, the main projection devices on the market include CRT (Cathode Ray Tube) projectors, LCD (Liquid Crystal Display) projectors, and DLP (Digital Light Processing) projectors. LCD projectors mainly include single-LCD projectors and triple-LCD projectors. Single-LCD projectors have a simple structure and low cost, making them suitable for low- and middle-income consumers, and therefore have considerable growth potential.
[0004] Existing single-LCD projection devices have high brightness at the center and low brightness at the edges, resulting in poor uniformity of the actual projected image. Summary of the Invention
[0005] This application addresses the shortcomings of existing methods by proposing a projection device and display system to solve the technical problem that existing single LCD projection devices have high center brightness and low edge brightness, resulting in poor uniformity of the actual projected image.
[0006] In a first aspect, embodiments of this application provide a projection device, including: a light source assembly, a light-concentrating assembly, a display panel, and a lens assembly; light emitted by the light source assembly sequentially passes through the light-concentrating assembly, the display panel, and the lens assembly before exiting; the surface of the light-concentrating assembly includes multiple unit regions, the multiple unit regions not exceeding an X*Y region range, where X and Y are both positive integers; a reflective film covers the multiple unit regions on the surface of the light-concentrating assembly; the reflectivity of the reflective film corresponding to at least one of the unit regions is different from the reflectivity of the reflective films corresponding to the remaining unit regions; light reflected from different unit regions of the light-concentrating assembly is incident on different unit display regions of the display panel.
[0007] Optionally, the surface of the light-concentrating component includes a central region and a peripheral region. The central region includes M*N unit regions, where M is a positive integer less than X and N is a positive integer less than Y. The peripheral region includes at least one unit region. The reflectivity of the reflective film located in the central region is lower than that of the reflective film located in the peripheral region.
[0008] Optionally, light reflected from the central area of the light-concentrating component is incident on the central area of the display panel, and light reflected from the peripheral area of the surface of the light-concentrating component is incident on the edge area of the display panel.
[0009] Optionally, the light-concentrating component includes a reflector cup; the light source component is disposed on the inlet side of the reflector cup, and the display panel is disposed on the outlet side of the reflector cup; along a direction parallel to the display panel, the size of the outlet side of the reflector cup is larger than the size of the inlet side of the reflector cup; the surface of the light-concentrating component includes the inner sidewall of the reflector cup.
[0010] Optionally, the light-concentrating assembly includes a plano-convex lens and a first reflector; the light source assembly is disposed on one side of the plane of the plano-convex lens, the first reflector is disposed on one side of the convex surface of the plano-convex lens, the central axis of the plano-convex lens is parallel to the incident light path of the first reflector, and the outgoing light path of the first reflector is perpendicular to the display panel; the surface of the light-concentrating assembly includes the surface of the first reflector.
[0011] Optionally, in a cross-section perpendicular to the display panel, the shape of the first reflector may include a trapezoid.
[0012] Optionally, the reflectivity of the reflective film corresponding to the four corner regions in the peripheral region of the first reflector is lower than the reflectivity of the reflective film corresponding to the central region and the peripheral region of the first reflector, excluding the corner regions.
[0013] Optionally, the projection device further includes a first lens disposed between the light-collecting component and the display panel; light originating from the light-collecting component is modulated by the first lens into approximately collimated light and incident on the display panel.
[0014] Optionally, the projection device further includes a second lens, which is disposed on the side of the display panel away from the first lens; the second lens and the display panel are respectively embedded in opposite sides of the projection device fixing frame.
[0015] Optionally, the projection device further includes a second reflector disposed on the side of the second lens away from the display panel; the central axis of the second lens is parallel to the incident light path of the second reflector, and the outgoing light path of the second reflector is parallel to the optical axis of the lens assembly; the second reflector is detachably mounted on the housing of the projection device.
[0016] Secondly, embodiments of this application provide a display system, including: a projection device as described in the first aspect; and a projection screen for receiving light emitted from the lens assembly of the projection device to form a projected image.
[0017] The beneficial technical effects of the technical solutions provided in this application include:
[0018] The projection device provided in this application embodiment has a reflective film covering multiple unit areas on the surface of a light-concentrating component. Light emitted from the light source component passes sequentially through the light-concentrating component, the display panel, and the lens assembly before exiting. Light reflected from different unit areas of the light-concentrating component is incident on different unit display areas of the display panel. By adjusting the reflectivity of the reflective film corresponding to different unit areas on the surface of the light-concentrating component, the illuminance of the light reflected from different unit areas of the light-concentrating component is made similar, thereby making the brightness of the light incident on different unit display areas of the display panel similar, thus improving the uniformity of the overall image.
[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description
[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:
[0021] Figure 1 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application;
[0022] Figure 2 An exploded view of a display panel, a second lens, and a fixing frame in a projection device provided in an embodiment of this application;
[0023] Figure 3 To show in a simplified manner (i.e., omitting irrelevant structures) Figure 1 A right view of the display panel in the projection device fitting into the groove on the inner surface of the housing;
[0024] Figure 4 To illustrate in a simplified manner (i.e., omitting structures unrelated to the optical path) Figure 1 Schematic diagram of the optical path of the projection device;
[0025] Figure 5 To illustrate the optical path of another projection device provided in the embodiments of this application in a simplified manner (i.e., omitting structures unrelated to the optical path);
[0026] Figure 6 for Figure 4 A schematic diagram of the surface area ratio of the first reflecting mirror;
[0027] Figure 7 This is a schematic diagram of an embodiment of a projection device provided in this application, showing that the surface of the first mirror is covered with a reflective film of two reflectivities.
[0028] In the picture:
[0029] 1-Shell; 11-Inner surface; 111-Groove;
[0030] 2-Light source assembly; 21-Light-emitting element; 22-Base; 3-Lens assembly;
[0031] 41-First radiator; 42-Second radiator; 51-First fan; 52-Second fan;
[0032] 61-First lens; 62-Light-transmitting part; 63-Second lens; 64-Display panel; 65-Second reflector;
[0033] 71-First opening; 72-Second opening; 73-Third opening; 74-Cavity;
[0034] 8-Concentrating light assembly; 81-Planar-convex lens; 82-First reflecting mirror; 83-Reflector cup;
[0035] 9-Fixed frame; 91-Through side; 92-Positioning side; 921-Protruding rib; 93-U-shaped buckle; 931-Matching protruding rib;
[0036] 10-Base plate; 101-Supporting surface; 102-Supporting foot; 103-Bearing structure. Detailed Implementation
[0037] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.
[0038] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the word “comprising” as used in the specification of this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by the art. The term “and / or” as used herein refers to at least one of the items defined by the term; for example, “A and / or B” can be implemented as “A,” or as “B,” or as “A and B.”
[0039] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0040] First, the relevant technologies involved in this application will be explained:
[0041] The inventors of this application discovered through research that existing single LCD projection devices have high brightness at the center and low brightness at the edges, resulting in poor uniformity of the actual projected image.
[0042] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. It should be noted that the following embodiments can be referenced, learned from, or combined with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be described again.
[0043] This application provides a projection device, see [link to relevant documentation]. Figure 1 and Figure 4-7 It includes: light source assembly 2, light focusing assembly 8, display panel 64 and lens assembly 3.
[0044] The light emitted by the light source assembly 2 passes through the light focusing assembly 8, the display panel 64 and the lens assembly 3 in sequence before being emitted.
[0045] The surface of the light-concentrating component 8 includes multiple unit regions, which do not exceed the range of X*Y, where X and Y are both positive integers; a reflective film covers the multiple unit regions on the surface of the light-concentrating component 8; the reflectivity of the reflective film corresponding to at least one unit region is different from the reflectivity of the reflective film corresponding to the remaining unit regions.
[0046] The light reflected from different unit areas of the light-concentrating component 8 is incident on different unit display areas of the display panel 64.
[0047] Optionally, the focusing component 8 in the embodiments of this application includes, for example, the following components: Figure 4 The surface of the first reflecting mirror 82 shown, or as... Figure 5 The inner wall of the reflector cup 83 is shown. The surface of the focusing assembly 8 is described below, using the first reflector 82 as an example. Figure 6 As shown, in this application, the multiple unit areas on the surface of the light-concentrating component 8 do not exceed the X*Y region range, which means that the multiple unit areas on the surface of the light-concentrating component 8 do not exceed the region range of X rows and Y columns.
[0048] The projection device provided in this application embodiment has a reflective film covering multiple unit areas on the surface of the light-concentrating component 8. Light emitted from the light source component 2 passes sequentially through the light-concentrating component 8, the display panel 64, and the lens component 3 before exiting. Light reflected from different unit areas of the light-concentrating component 8 is incident on different unit display areas of the display panel 64. By adjusting the reflectivity of the reflective film corresponding to different unit areas on the surface of the light-concentrating component 8, the illuminance of the light reflected from different unit areas of the light-concentrating component 8 is made similar, thereby making the brightness of the light incident on different unit display areas of the display panel 64 similar, thus improving the uniformity of the overall image.
[0049] Optionally, in one embodiment of this application, see [link to relevant documentation]. Figure 4-6 As shown, the surface of the light-concentrating component 8 includes a central area and a peripheral area. The central area includes M*N unit regions, where M is a positive integer less than X and N is a positive integer less than Y. The peripheral area includes at least one unit region.
[0050] The reflectivity of the reflective film located in the central area of the surface of the light-concentrating component 8 is lower than that of the reflective film located in the peripheral area of the surface of the light-concentrating component 8.
[0051] Optionally, in this embodiment, the surface of the light-concentrating component 8 is divided into a central area and a peripheral area. The central area includes M*N unit areas, and the peripheral area includes the remaining unit areas on the surface of the light-concentrating component 8 excluding the central area. The reflectivity of the reflective film corresponding to the M*N unit areas in the central area of the light-concentrating component 8 is lower than that of the reflective film corresponding to the peripheral area of the light-concentrating component 8, so that the illuminance of the light reflected from the central area and the peripheral area of the light-concentrating component 8 is similar, thereby improving the uniformity of the overall image.
[0052] Optionally, in one embodiment of this application, see [link to relevant documentation]. Figure 4-6 As shown, light reflected from the central area of the light-concentrating component 8 is incident on the central area of the display panel 64, and light reflected from the peripheral area of the surface of the light-concentrating component 8 is incident on the edge area of the display panel 64.
[0053] Optionally, in this embodiment, the light reflected from the central area of the light-concentrating component 8 is incident on the central area of the display panel 64, and the light reflected from the peripheral area of the surface of the light-concentrating component 8 is incident on the edge area of the display panel 64. By adjusting the reflectivity of the reflective film corresponding to the central area of the surface of the light-concentrating component 8 and the reflectivity of the reflective film corresponding to the peripheral area of the surface of the light-concentrating component 8, the illuminance of the light reflected from the central area of the surface of the light-concentrating component 8 and the light reflected from the peripheral area of the surface of the light-concentrating component 8 are made similar, thereby making the brightness of the light incident on different unit display areas of the display panel 64 similar, thereby improving the uniformity of the overall picture.
[0054] Optionally, in one embodiment of this application, see [link to relevant documentation]. Figure 5 As shown, the light-concentrating component 8 includes a reflector cup 83.
[0055] The light source assembly 2 is located on the inlet side of the reflector cup 83, and the display panel 64 is located on the outlet side of the reflector cup 83; along the direction e parallel to the display panel 64, the size of the outlet side of the reflector cup 83 is larger than the size of the inlet side of the reflector cup 83.
[0056] The surface of the focusing component 8 includes the inner wall of the reflector cup 83.
[0057] Optionally, in the embodiments of this application, such as Figure 5 As shown, direction e is parallel to the display panel 64, and direction f is perpendicular to the display panel 64. The light emitted by the light source assembly 2 enters the reflector 83 from the inlet side of the reflector 83. After being reflected by the inner wall of the reflector 83, the light enters the display panel 64 from the outlet side of the reflector 83. The image generated by the display panel 64 is projected onto the screen through the lens assembly 3 to form a projected image.
[0058] Optionally, in this embodiment, along the direction parallel to the display panel 64, the size of the reflector 83 on the side closer to the display panel 64 is larger than the size of the reflector 83 on the side closer to the light source assembly 2, that is, the size of the reflector 83 on the outlet side is larger than the size of the reflector 83 on the inlet side.
[0059] Optionally, in this embodiment, the inner wall of the reflector 83 includes multiple unit regions, which do not exceed the X*Y region; a reflective film covers the inner wall of the reflector 83. In one specific embodiment, the multiple unit regions of the inner wall of the reflector 83 can be divided into a central region and a peripheral region. The central region includes M*N unit regions, where M is a positive integer less than X and N is a positive integer less than Y; the peripheral region includes at least one unit region. Light reflected from the central area of the inner wall of the reflector cup 83 is incident on the central area of the display panel 64, while light reflected from the peripheral area of the inner wall of the reflector cup 83 is incident on the edge area of the display panel. By adjusting the reflectivity of the reflective film corresponding to the central area of the inner wall of the reflector cup 83 and the reflectivity of the reflective film corresponding to the peripheral area of the inner wall of the reflector cup 83, the illuminance of the light reflected from the central area of the inner wall of the reflector cup 83 and the light reflected from the peripheral area of the inner wall of the reflector cup 83 is made similar. This makes the brightness of the light incident on different unit display areas of the display panel 64 similar, thereby improving the uniformity of the overall image.
[0060] Optionally, in one embodiment of this application, see [link to relevant documentation]. Figure 4 and Figure 6-7 As shown, the light-concentrating assembly 8 includes a plano-convex lens 81 and a first reflector 82.
[0061] The light source assembly 2 is disposed on one side of the plane of the plano-convex lens 81, and the first reflector 82 is disposed on one side of the convex surface of the plano-convex lens 81. The central axis of the plano-convex lens 81 is parallel to the incident light path of the first reflector 82, and the outgoing light path of the first reflector 82 is perpendicular to the display panel 64.
[0062] The surface of the light-concentrating component 8 includes the surface of the first reflector 82.
[0063] Optionally, in this embodiment, the light emitted from the light source assembly 2 enters the plano-convex lens 81 from its flat surface. After being refracted by the convex surface of the plano-convex lens 81, the light enters the first reflecting mirror 82. The light is reflected by the first reflecting mirror 82 and incident on the display panel 64. The image generated by the display panel 64 is projected onto a screen several meters away by the lens assembly 3 to form a projected image. The first reflecting mirror 82 is disposed on one side of the convex surface of the plano-convex lens 81. The central axis of the plano-convex lens 81 is parallel to the incident light path of the first reflecting mirror 82, and the outgoing light path of the first reflecting mirror 82 is perpendicular to the display panel 64.
[0064] Optionally, in the embodiments of this application, such as Figure 6 As shown, the surface of the first reflector 82 includes multiple unit regions, each not exceeding the X*Y region; a reflective film covers these multiple unit regions on the surface of the first reflector 82. i1j1 With S i2j2 These represent two unit regions on the surface of the first reflecting mirror 82, where i1 and i2 represent the row numbers containing the unit regions, and j1 and j2 represent the column numbers containing the unit regions. Both i1 and i2 are not greater than x, and j1 and j2 are not greater than y. In a specific embodiment, as shown... Figure 6-7 As shown, the surface of the first reflecting mirror 82 can be divided into multiple unit regions, namely a central region a and a peripheral region b; unit region S i1j1 Located in central area a, unit area S i2j2 Located in the peripheral area b. Light reflected from the central area a of the surface of the first reflector 82 is incident on the central area of the display panel 64, and light reflected from the peripheral area b of the surface of the first reflector 82 is incident on the edge area of the display panel 64. By adjusting the reflectivity of the reflective film corresponding to the central area a and the peripheral area b of the surface of the first reflector 82, the illuminance of the light reflected from the central area a and the light reflected from the peripheral area b of the surface of the first reflector 82 is made similar, thereby making the brightness of the light incident on different unit display areas of the display panel 64 similar, thus improving the uniformity of the overall picture.
[0065] Optionally, in this application, the focusing component 8 of the projection device mainly includes two types: one is a reflector cup 83, and the other is a combination of a plano-convex lens 81 and a first reflector 82. The structures of other components in the projection devices corresponding to the two focusing components 8 are basically the same. The following describes the structure of the projection device in detail, taking the projection device corresponding to the focusing component 8 using a plano-convex lens 81 and a first reflector 82 as an example.
[0066] For ease of description of the projection device's structure, this application refers to the side of the projection device facing the projected image as the front side or front-facing side; the rear side or rearward side refers to the side of the projection device facing away from the projected image; the left and right sides are the sides perpendicular to the front-back direction; and the top and bottom sides are the directions perpendicular to both the front-back and left-back directions. Figure 1 For example, the lens assembly 3 is located in front of the first reflector 112 and above the first fan 51.
[0067] This application provides a projection device, see [link to previous document]. Figure 1 As shown, the projection device includes a housing 1. The housing 1 includes opposing front and rear surfaces, the front surface including a first opening 71 and a second opening 72, and at least a portion of a third opening 73 located on the rear surface.
[0068] The light source assembly 2 includes: a light-emitting element 21 and a base 22. The light-emitting element 21 is disposed on the base 22 and is located at the first opening 71. The lens assembly 3 is located at the second opening 72. The first heat sink 41 is located at the third opening 73. The light source assembly 2, the lens assembly 3, the first heat sink 41, and the housing 1 together constitute a sealed cavity 74. The cavity 74 can be a sealed space, thereby preventing dust from entering the interior of the housing 1 and thus keeping the optical components clean.
[0069] The first fan 51 is located on the side of the light-emitting component 2 away from the cavity 74; the second heat sink 42 is located on the side of the first fan 51 away from the light-emitting component 2.
[0070] The projection device also includes a base plate 10. The base plate 10 is disposed opposite to a portion of the first heat sink 41. The base plate 10 includes a support surface 101, a support foot 102, and a load-bearing structure 103. The support foot 102 is in direct contact with the surface on which the projection device is placed, and the support surface 101 is located on the side of the support foot 102 away from the surface on which the projection device is placed. The load-bearing structure 103 is disposed on the side of the support surface 101 away from the support foot 102 and is used to support the housing 1.
[0071] Optionally, in this embodiment of the application, an airtight sealing filler is provided between the second opening 72 and the lens assembly 3, thereby improving the airtightness of the cavity 74. The housing 1 refers to the outer shell structure of the projection device.
[0072] Optionally, in the embodiments of this application, such as Figure 1 As shown, the first heat sink 41 can be bow-shaped, so that the main heat dissipation area inside the projector is fully enclosed by the first heat sink 41, which can fully facilitate heat exchange and improve heat dissipation efficiency. The first heat sink 41 includes a cast aluminum heat sink.
[0073] Optionally, in the embodiments of this application, when the projection device is in operation, the projection lens 3 is higher than the light source assembly 2; the housing 1 also includes a bottom surface and a top surface, the bottom surface is lower than the top surface, and the front surface and the rear surface are respectively connected to the top surface and the bottom surface.
[0074] Optionally, in this embodiment of the application, the projection device further includes a second fan 52 located in the cavity 74. The second fan 52 is used to drive the air circulation in the cavity 74, and the hot air in the cavity 74 exchanges heat with the cold air outside through the first radiator 41.
[0075] Optionally, in the embodiments of this application, see Figure 1 As shown, the plano-convex lens 81 is located on the light-emitting side of the light source assembly 2, and is used to converge the light emitted by the light source assembly 21, thereby achieving light convergence or shaping, ensuring the utilization rate of the light emitted by the light-emitting element 21, and saving energy. The first reflector 82 is obliquely disposed on the side of the second fan 52 away from the first heat sink 41. The convex surface of the plano-convex lens 81 faces the first reflector 82. The first reflector 82 is inside the cavity 74 and is snapped onto the housing 1.
[0076] Optionally, in one embodiment of this application, see [link to relevant documentation]. Figure 6-7 As shown, in a cross-section perpendicular to the display panel 64, the shape of the first reflector 82 includes a trapezoid.
[0077] Optionally, in this embodiment, the shape of the first reflector 82 in a cross-section perpendicular to the display panel 64 includes a trapezoid, such as... Figure 6-7 As shown, S i1j1 With S i2j2 Two unit regions S represent the surface of the first reflecting mirror 82. i1j1 Located in central area a, unit area S i2j2 Located in surrounding area b. (For example...) Figure 4 As shown, light reflected from the central area a of the trapezoidal cross-section of the first reflector 82 is incident on the central area of the display panel 64, and light reflected from the peripheral area b of the trapezoidal cross-section of the first reflector 82 is incident on the edge area of the display panel 64.
[0078] Optionally, in one embodiment of this application, see [link to relevant documentation]. Figure 6-7 As shown, the reflectivity of the reflective film in the four corner regions of the peripheral area of the first reflector 82 is lower than that in the central area and the peripheral area of the first reflector 82 excluding the corner regions.
[0079] Optionally, in one specific embodiment of this application, such as Figure 6As shown, X and Y are both 9, meaning that multiple unit regions on the surface of the first reflector 82 do not exceed a range of 9 rows and 9 columns. The central region a of the first reflector 82 includes 3*3 unit regions, and the unit region S i1j1 Located in the central region a, the peripheral region b of the first reflecting mirror includes the remaining unit region S. i2j2 Located in the surrounding area b. The 9*9 region containing multiple unit areas on the surface of the first reflector 82 is divided into 3*3 unit areas along the X and Y directions, so that each receiving surface used to detect the brightness of the light reflected by the first reflector 82 receives the light. The unit areas on the surface of the first reflector 82 are located within the 9 areas of the X*Y region. Since the position of the light on the receiving surface is mirror-symmetrical to the area on the surface of the first reflector 82, the upper left corner of the first reflector 82 corresponds to the upper right corner of the receiving surface, the lower left corner corresponds to the lower right corner, the fixed angle area at the upper left corner of the first reflector 82 corresponds to the fixed angle area at the upper right corner of the receiving surface, and the fixed angle area at the lower left corner of the first reflector 82 corresponds to the fixed angle area at the lower right corner of the receiving surface. It should be noted that, due to... Figure 6 The first reflector 82 is trapezoidal in shape, so not all the unit regions included in the 3*3 unit regions of the X*Y region are located on the surface of the first reflector 82; in addition, the first reflector 82 can also be designed in other shapes, and this application does not limit it.
[0080] A reflective film with the same reflectivity was attached to the central region a and the peripheral region b of the first reflector 82. The brightness data for each region, as well as the four fixed-angle regions within the peripheral region b of the first reflector 82, are shown in Table 1. The uniformity data are shown in Table 2. In Table 1, the nine data points from the central region correspond to nine 3*3 regions in the X*Y region, representing the brightness of reflected light corresponding to a unit area on the surface of the first reflector 82. The order of the nine data points corresponds to the order of the corresponding regions on the receiving surface. The data points at the four corners in Table 1 correspond to the brightness of reflected light corresponding to the four apex regions within the peripheral region b of the first reflector 82. The order of the data at the four corners corresponds to the order of the corresponding regions on the receiving surface. In Table 2, A corresponds to the upper left corner, B to the upper right corner, C to the lower left corner, and D to the lower right corner in Table 1, and so on.
[0081] The calculation method for four-point uniformity is to divide the average of the data at the four corners of the nine data points in the central area of Table 1 by the data at the center, i.e., (276+276+294+291) / 4 / 458 = 62%. The calculation method for nine-point uniformity is to divide the average of the nine data points in the central area of Table 1 by the data at the center, i.e., (276+374+276+318+458+312+294+382+291) / 9 / 458 = 72%.
[0082] Table 1
[0083] 276 374 276 318 458 312 294 382 291 126 135
[0084] Table 2
[0085]
[0086]
[0087] The reflectivity of the reflective film attached to the central region a of the surface of the first reflector 82 is lower than that of the reflective film attached to the peripheral region b of the surface of the first reflector 82. The brightness data for each region and the four fixed-angle regions within the peripheral region b of the first reflector 82 are shown in Table 3, and the uniformity data are shown in Table 4. The data corresponding to the central region in Table 3 corresponds to the brightness of the central region a. The regions of the first reflector 82 corresponding to the data in Table 3 are the same as those in Table 1, and will not be repeated here. The meanings of the data in Table 4 are the same as those in Table 2, and will not be repeated here.
[0088] Table 3
[0089] 276 372 276 318 437 313 294 382 291 126 135
[0090] Table 4
[0091] 9-point uniformity 75％ 9 points of brightness / lm 734 A 33％ B 32％ C 29％ D 31％
[0092] Comparing the data in Table 4 and Table 2 reveals that, without altering any structure of the projection device, simply setting the reflectivity of the reflective film attached to the central area a of the first reflector 82 to be lower than that of the reflective film attached to the peripheral area b of the first reflector 82 improves the uniformity at four points by 3 points, the uniformity at nine points by 3 points, and the uniformity of the four fixed-angle regions within the peripheral area b of the first reflector 82 by at least 1-2 points. This improves the overall uniformity of the image and the uniformity of the four fixed-angle regions. Furthermore, this improvement in uniformity without altering any other structure of the projection device is beneficial for cost savings.
[0093] Optionally, in one embodiment of this application, see [link to relevant documentation]. Figure 1 and 4 As shown in Figure 5, the projection device also includes a first lens 61, which is disposed between the light-concentrating component 8 and the display panel 64.
[0094] The light source from the light-concentrating component 8 is modulated into approximately collimated light by the first lens 61 and then enters the display panel 64.
[0095] Optionally, the projection device further includes a light-transmitting section 62, which is disposed on the side of the first lens 61 away from the light-concentrating assembly 8. The material of the light-transmitting section 62 includes glass, and the function of the light-transmitting section 62 is heat insulation. The surfaces on both sides of the light-transmitting section 62 are flat, so that light does not converge or diverge before or after passing through the light-transmitting section 62.
[0096] Optionally, in this embodiment of the application, the first lens 61 includes a convex lens, a Fresnel lens or an aspherical mirror, and is used to focus the light emitted from the light-concentrating component 8 to obtain approximately collimated light, which passes through the light-transmitting part 62 and enters the display panel 64.
[0097] Optionally, in the embodiments of this application, see Figure 1 The first lens 61 and the light-transmitting part 62 are snapped onto the housing 1. The first lens 61 is located on the side of the first reflector 112 away from the second fan 52, and the light-transmitting part 62 is located on the side of the first lens 61 away from the first reflector 61.
[0098] Optionally, in one embodiment of this application, see [link to relevant documentation]. Figure 1 and Figure 4-5 As shown, the projection device also includes a second lens 63, which is disposed on the side of the display panel 64 away from the first lens 61.
[0099] The second lens 63 and the display panel 64 are respectively embedded on opposite sides of the projection device fixing frame 9.
[0100] Optionally, in the embodiments of this application, the second lens 63 includes a convex lens, a Fresnel lens, or an aspherical mirror.
[0101] Optionally, in the embodiments of this application, see Figure 1-3As shown, the projection device also includes a fixing frame 9, which is disposed on the side of the light-transmitting portion 62 away from the first lens 61. The display panel 64 and the second lens 63 are respectively embedded on opposite sides of the fixing frame 9. There is a certain distance between the second lens 63 and the display panel 64. The fixing frame 9 includes two through sides 91 disposed opposite to each other, one of which faces the first heat sink 41. The fixing frame 9 includes two positioning sides 92 disposed opposite to each other; the two positioning sides 92 are connected to the two through sides 91. Each positioning side 92 includes a positioning part for cooperating with the housing 1 to achieve positioning of the fixing frame 9. The positioning part includes a protrusion 921, which extends in the same direction as the display panel 64. The fixing frame 9 also includes a U-shaped buckle 93; the display panel 64, the fixing frame 9, and the second lens 63 are all disposed between the two ends of the U-shaped buckle 93; the buckle 93 clamps at least one positioning side 92 of the fixing frame 9; the U-shaped buckle is used to limit the display panel 64 and the second lens 63 in the thickness direction. The U-shaped buckle 93 clamps the positioning side 92 of the fixing frame 9, which includes a mating protrusion 931. Preferably, the mating protrusion 931 is continuously arranged with the protrusion 921 of the positioning part to form a continuously distributed linear slide rail. Figure 3 As shown, the inner surface 11 of the housing 1 includes a groove 110, and a protrusion 921 engages with the groove 111 to achieve positioning and sliding of the fixing frame 9. The protrusion 921 is configured to slide within the groove 111, thereby pulling the display panel 64 out of or into the housing 1. It should be noted that the groove 111 may be part of the housing 1 or a mechanical structure connected to the housing 1.
[0102] Optionally, the first heat sink 41 is detachable from the housing 1. The mounting frame 9 can be inserted into the projection device or removed from inside the projection device after the first heat sink 4 is removed from the housing 1, thus facilitating the maintenance of the projection device.
[0103] Optionally, in one embodiment of this application, see [link to relevant documentation]. Figure 1 and Figure 4-5 As shown, the projection device also includes a second reflector 65, which is disposed on the side of the second lens 63 away from the display panel 64; the central axis of the second lens 63 is parallel to the incident light path of the second reflector 65, and the outgoing light path of the second reflector 65 is parallel to the optical axis of the lens assembly 3.
[0104] The second reflector 65 is detachably mounted on the housing 1 of the projection device.
[0105] Optionally, the outgoing light path of the second reflector 65 is collinear with the optical axis of the lens assembly 3.
[0106] Optionally, see Figure 1As shown, the projection device also includes a second reflector 65; the second reflector 65 is located on the side of the fixing frame 9 away from the light-transmitting part 62. The second reflector 65 is obliquely disposed on one side of the housing 1 and is detachably mounted on the housing 1.
[0107] Optionally, in this embodiment, the image generated by the display panel 64 is focused by the second lens 63, passes through the second reflector 65 and the lens assembly 3 in sequence, and is projected onto a screen several meters away to form a projected image.
[0108] Based on the same inventive concept, this application also provides a display system, including: a display device as described in the first aspect; and a projection screen for receiving light emitted from the lens assembly of the projection device to form a projected image.
[0109] Since the display system uses any of the display devices provided in the foregoing embodiments, its principles and technical effects are described in the foregoing embodiments and will not be repeated here.
[0110] By applying the embodiments of this application, at least the following beneficial effects can be achieved:
[0111] 1. The projection device provided in this application embodiment has a reflective film covering multiple unit areas on the surface of the light-concentrating component 8. The light emitted by the light source component 2 passes sequentially through the light-concentrating component 8, the display panel 64, and the lens component 3 before exiting. The light reflected from different unit areas of the light-concentrating component 8 is incident on different unit display areas of the display panel 64. By adjusting the reflectivity of the reflective film corresponding to different unit areas on the surface of the light-concentrating component 8, the illuminance of the light reflected from different unit areas of the light-concentrating component 8 is made similar, thereby making the brightness of the light incident on different unit display areas of the display panel 64 similar, thus improving the uniformity of the overall image.
[0112] 2. In this embodiment, the light reflected from the central area of the light-concentrating component 8 is incident on the central area of the display panel 64, and the light reflected from the peripheral area of the surface of the light-concentrating component 8 is incident on the edge area of the display panel 64. By adjusting the reflectivity of the reflective film corresponding to the central area of the surface of the light-concentrating component 8 and the reflectivity of the reflective film corresponding to the peripheral area of the surface of the light-concentrating component 8, the illuminance of the light reflected from the central area of the surface of the light-concentrating component 8 and the light reflected from the peripheral area of the surface of the light-concentrating component 8 are made similar, thereby making the brightness of the light incident on different unit display areas of the display panel 64 similar, thereby improving the uniformity of the overall picture.
[0113] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.
[0114] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate directions or positional relationships based on the exemplary directions or positional relationships shown in the accompanying drawings. They are used to facilitate the description or simplification of the embodiments of this application and are not intended to indicate or imply that the device or component 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 application.
[0115] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0116] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0117] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
[0118] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown sequentially according to the arrows, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of this application, the steps in each process can be executed in other orders as needed. Moreover, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages may be executed at the same time or at different times. In scenarios where the execution times are different, the execution order of these sub-steps or stages can be flexibly configured according to needs, and this application does not limit this.
[0119] The above description is only a partial implementation of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.
Claims
1. A projection device, characterized in that, include: Light source assembly, focusing assembly, display panel, and lens assembly; The light emitted by the light source assembly passes sequentially through the light-concentrating assembly, the display panel, and the lens assembly before exiting; The surface of the light-concentrating component includes multiple unit regions, which do not exceed the range of X*Y, where X and Y are both positive integers; a reflective film covers the multiple unit regions on the surface of the light-concentrating component; the reflectivity of the reflective film corresponding to at least one of the unit regions is different from the reflectivity of the reflective films corresponding to the remaining unit regions; The light reflected from different unit areas of the light-concentrating component is incident on different unit display areas of the display panel; The surface of the light-concentrating component includes a central area and a peripheral area. The central area includes M*N unit regions, where M is a positive integer less than X and N is a positive integer less than Y. The peripheral area includes at least one unit region. The reflectivity of the reflective film located in the central region is lower than that of the reflective film located in the peripheral region, and the illuminance of the light reflected from the central region and the peripheral region is similar. The projection device further includes a first lens disposed between the light-gathering component and the display panel; the projection device further includes a second lens disposed on the side of the display panel away from the first lens; the projection device further includes a second reflector detachably mounted on the housing of the projection device. The second lens and the display panel are respectively embedded on opposite sides of the projection device fixing frame; the fixing frame includes two through sides arranged opposite to each other, and the fixing frame also includes two positioning sides arranged opposite to each other. The two positioning sides are connected to the two through sides. Each positioning side includes a positioning part, and the positioning part includes a protruding ridge. The protruding ridge is in the same direction as the extension of the display panel; the fixing frame also includes a U-shaped buckle; the U-shaped buckle is used to limit the display panel and the second lens in the thickness direction. The position of the positioning side of the fixing frame held by the U-shaped buckle includes a matching protruding ridge. The matching protruding ridge is connected to the protruding ridge of the positioning part to form a continuously distributed linear slide rail; the inner surface of the housing includes a groove. The protruding ridge and the groove cooperate to realize the positioning and sliding of the fixing frame.
2. The projection device according to claim 1, characterized in that, Light reflected from the central area of the light-concentrating component is incident on the central area of the display panel, and light reflected from the peripheral area of the surface of the light-concentrating component is incident on the edge area of the display panel.
3. The projection device according to claim 1, characterized in that, The focusing component includes a reflector cup; The light source assembly is disposed on the inlet side of the reflector, and the display panel is disposed on the outlet side of the reflector; along a direction parallel to the display panel, the size of the outlet side of the reflector is larger than the size of the inlet side of the reflector. The surface of the focusing component includes the inner wall of the reflector cup.
4. The projection device according to claim 1, characterized in that, The light-concentrating component includes a plano-convex lens and a first reflecting mirror; The light source assembly is disposed on one side of the plane of the plano-convex lens, the first reflector is disposed on one side of the convex surface of the plano-convex lens, the central axis of the plano-convex lens is parallel to the incident light path of the first reflector, and the outgoing light path of the first reflector is perpendicular to the display panel. The surface of the focusing component includes the surface of the first reflector.
5. The projection device according to claim 4, characterized in that, In a cross-section perpendicular to the display panel, the shape of the first reflector includes a trapezoid.
6. The projection device according to claim 1 or 2, characterized in that, The light originating from the light-concentrating component is modulated into approximately collimated light by the first lens and then incident on the display panel.
7. The projection device according to claim 6, characterized in that, The second reflector is disposed on the side of the second lens away from the display panel; the central axis of the second lens is parallel to the incident light path of the second reflector, and the outgoing light path of the second reflector is parallel to the optical axis of the lens assembly.
8. A display system, characterized in that, include: The projection device as described in any one of claims 1-7; A projection screen is used to receive light emitted from the lens assembly of the projection device to form a projected image.