Display system and light type bias diaphragm thereof

Abstract

The invention provides a display system and a light type bias diaphragm thereof. The display system comprises a projection screen, a display module and a virtual eye area. The display module is arranged opposite to the projection screen surface and generates an image light which is reflected by the projection screen surface to generate an image at least on the virtual eye area. A backlight module of the display module comprises a light source module and a light type bias diaphragm. The light type bias diaphragm is arranged corresponding to the light emitting side of the light source module. The light type bias diaphragm comprises a substrate and a plurality of first prism columns, and the first prism columns are arranged along a first direction and respectively extend along a second direction. Emission light fields generated by at least part of the light-emitting units closer to the first side edge of the light type bias diaphragm are biased towards the first side edge through the first prism columns receiving light rays.

Description

Technical Field

[0001] The present invention relates to a display system and a light-type biasing film thereof; in particular, the present invention relates to a head-up display system and a light-type biasing film thereof. Background Art

[0002] As display technology advances with each passing day, the application level and scope of display technology are becoming more and more extensive. In order to consider the convenience and safety of users in operating specific devices, such as vehicles and other means of transportation, one of the applications of display technology is to provide head-up displays for driving.

[0003] Traditionally, vehicle head-up displays are usually small in size and display little information, such as vehicle speed or other limited indication information. However, with the change in vehicle usage culture and the design concept of the operation interface, users' demand for the display area of ​​the head-up display has increased significantly. In addition, since the presence of the head-up display can reduce the frequency and time of drivers lowering their heads, it also improves the safety of the vehicle while driving. Therefore, the design trend of the vehicle operation interface is inevitably moving towards increasing the display area of ​​the head-up display.

[0004] However, due to the external environmental restrictions of the head-up display, such as the thickness and curvature of the front windshield, the position restrictions of the driver's cabin, the installation position restrictions, etc., various considerations are required in the optical design of the head-up display, and the image quality is often challenged. In addition, since the display area of ​​the head-up display is required to be increased, the image brightness within the display range is often lacking in uniformity and has a large difference, causing difficulty and inconvenience for users when reading information. Summary of the invention

[0005] An object of the present invention is to provide a display system having a more uniform image brightness within its display field of view.

[0006] An object of the present invention is to provide a light-type biasing film suitable for use in a backlight module, which can differentiate the emitted light fields of the light-emitting units included in the backlight module to improve the brightness uniformity of the combined light field.

[0007] On the one hand, the backlight module includes a light source module and a light type biasing film. The light source module includes a plurality of light emitting units arranged in an array. The light type biasing film is arranged corresponding to the light emitting side of the light source module to receive the source light generated by the light emitting unit, wherein the source light passes through the light type adjustment unit to form a biased emission light field. The light type biasing film includes a substrate and a plurality of first prism columns arranged on the substrate. The substrate has a first side, the first side intersects with the first direction and extends along the second direction. The first prism columns are arranged along the first direction and extend along the second direction respectively. Each first prism column has a first main prism face and a first secondary prism face relative to each other. The emission light field generated by at least part of the light emitting units closer to the first side is biased toward the first side in the first direction via the first prism column that receives the light.

[0008] In another aspect, the display system includes a projection surface, a display module and a virtual eye zone, wherein the display module includes the aforementioned backlight module. The display module is disposed relative to the projection surface and generates an image light which is reflected by the projection surface to generate an image at least on the virtual eye zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1A and Figure 1B FIG. 4 is a schematic diagram of an embodiment of a display system of the present invention.

[0010] Figure 2A A schematic diagram of an embodiment of a display system is shown.

[0011] Figure 2B It is a schematic diagram of an embodiment of a display module in a display system.

[0012] Figure 3 is a schematic diagram of an embodiment of a backlight module.

[0013] Figure 4A and Figure 4B Schematic diagram of the emitted light field.

[0014] Figure 5 A schematic diagram of another embodiment of a backlight module is shown.

[0015] Figure 6 FIG. 4 is a schematic diagram of another embodiment of an optical bias film.

[0016] Figure 7 FIG. 4 is a schematic diagram of another embodiment of an optical bias film.

[0017] Fig. 8A FIG. 1 is a schematic diagram of an embodiment of a backlight module.

[0018] Figure 8B FIG. 4 is a schematic diagram of another embodiment of a backlight module.

[0019] Figure 8CFIG. 4 is a schematic diagram of another embodiment of a backlight module.

[0020] Fig. 9 FIG. 4 is a schematic diagram of an embodiment of an original emission light field.

[0021] Fig. 10A FIG. 4 is a schematic diagram of another embodiment of the original emitted light field.

[0022] Fig. 10B FIG. 4 is a schematic diagram of another embodiment of an optical bias film.

[0023] Fig.11 FIG. 4 is a schematic diagram of another embodiment of a display system.

[0024] Fig.12 FIG. 4 is a schematic diagram of another embodiment of a display module.

[0025] Description of reference numerals:

[0026] 10 First Direction

[0027] 20 Second Direction

[0028] 30 Cockpit

[0029] 50 Top

[0030] 100 projection screen

[0031] 101 Second vertical axis

[0032] 110 First Section

[0033] 210 First Virtual Facade

[0034] 220 Second Virtual Facade

[0035] 300 Display Module

[0036] 301 Image Light

[0037] 302 Axis of Symmetry

[0038] 310 display panel

[0039] 320 Second Section

[0040] 330 Backlight Module

[0041] 331 Brightness Enhancement Film

[0042] 333 First Prism

[0043] 335 Second Prism

[0044] 337 First prism direction

[0045] 339 Second prism direction

[0046] 400 optical bias film

[0047] 410 base plate

[0048] 411 First side

[0049] 412 Second side

[0050] 413 Upper surface

[0051] 415 Central part

[0052] 417 Part 1

[0053] 419 Part 2

[0054] 430, 430a, 430b first prism column

[0055] 431 First main prism face

[0056] 433 The First Prism Face

[0057] 450, 450a, 450b second prism column

[0058] 451 Second main prism surface

[0059] 453 Second Prism Face

[0060] 500 Virtual Eye Area

[0061] 501 First Vertical Axis

[0062] 700 Light source module

[0063] 710, 710a, 710b light emitting unit

[0064] 715 light emitting surface

[0065] 810 Source Light

[0066] 811 Original emission light field

[0067] 830 Emitting Light Field DETAILED DESCRIPTION

[0068] The following is a description of the implementation of the display module disclosed in the present invention through specific embodiments and accompanying drawings. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. However, the contents disclosed below are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can implement the present invention with other different embodiments based on different viewpoints and applications.

[0069] In the accompanying drawings, for the sake of clarity, the thickness of layers, films, panels, regions, etc. is magnified. Throughout the specification, the same reference numerals represent the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it may be directly on or connected to another element, or an intermediate element may also exist. On the contrary, when an element is referred to as being "directly on" or "directly connected to" another element, there is no intermediate element. As used herein, "connection" may refer to physical and / or electrical connection.

[0070] It should be understood that although the terms "first", "second", "third", etc. can be used to describe various elements, components, regions, layers and / or parts in this article, these elements, components, regions, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, the "first element", "first component", "first region", "first layer" or "first part" discussed below can be referred to as the second element, component, region, layer or part without departing from the teachings of this article.

[0071] The terms used herein are only for the purpose of describing specific embodiments and are not restrictive. As used herein, unless the content clearly indicates, the singular forms "one", "an" and "the" are intended to include plural forms, including "at least one". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more related listed items. It should also be understood that when used in this specification, the terms "comprising" and / or "including" specify the presence or addition of the features, regions, wholes, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, regions, wholes, steps, operations, elements, parts and / or their combinations.

[0072] The present invention relates to a display system and a light source module included therein. In one embodiment, the display system is used in a vehicle, other traffic devices, or other devices that require user operation, and is used as a head-up display device. In addition, the display system of the present invention is also used in a near-eye display or other projection-type display device. Figure 1A and Figure 1BIn the illustrated embodiment, the display system includes a projection surface 100, a display module 300, and a virtual eye area 500. In the embodiment where the display system is disposed in a vehicle, the projection surface 100 may be, for example, the front windshield of the vehicle, but is not limited thereto. In addition, the projection surface 100 may be a portion of the front windshield, such as a strip area near the bottom of the lower half of the front windshield. The display module 300 is disposed at an angle with the projection surface 100, such as an acute angle between 0 and 90 degrees. Figure 1A and Figure 1B In the illustrated embodiment, the display module 300 is disposed on the top 50 of the vehicle dashboard and console. Figure 1A and Figure 1B As shown, the display module 300 is extended and distributed along the first direction 10. The first direction 10 may be, for example, the long side direction of the projection surface 100, or the extension direction of the intersection of the projection surface 100 and the dashboard and the top of the console. When the display system is set in a vehicle, the first direction 10 may also be the vehicle width direction perpendicular to the vehicle's forward direction.

[0073] like Figure 1A and Figure 1B As shown, the vehicle or other device in which the display system is set has a cockpit 30 for a driver or other user. When the driver or other user is in the cockpit 30, his eyes will be limited to a certain spatial range due to his sitting posture, standing posture or other posture restrictions. This spatial range is an exemplary definition of the virtual eye zone 500. It can be seen that the virtual eye zone 500 is not a specific device structure, but as an imaging reference area when the display system is designed for imaging, for example, the reference area is provided by the car manufacturer to the head-up display design manufacturer and can be obtained by the cockpit 30 control design of the vehicle or other device and the preset driving / user ergonomic design. Since the possible movement range and different body conditions of the user are taken into consideration when designing the cockpit, the virtual eye zone 500 can be formed into a strip or columnar range with a longer length in the first direction 10. Specifically, the possible position range of the eyes of a user with a height between 150cm and 190cm when sitting in a seat can be estimated, and an embodiment range of the virtual eye zone 500 can be obtained.

[0074] like Figure 1A and Figure 1B As shown, the display module 300 is arranged relative to the projection surface 100, so that the image light 301 generated by the display module 300 can be projected onto the projection surface 100, and is reflected by the projection surface 100 to generate an image at least in the virtual eye area 500. Preferably, the image seen by the driver / user in the virtual eye area 500 is a virtual image generated by the image light 301 reflected by the projection surface 100.

[0075] exist Figure 2AIn the illustrated embodiment, the virtual eye area 500 has a first upright central axis 501 in a direction upright relative to the ground; and the projection surface 100 also has a second upright central axis 101 in a direction upright relative to the ground. In this embodiment, the aforementioned "upright" is not limited to vertical, but includes other upright states that are not parallel to the ground and are not at right angles to the ground. The first upright central axis 501 and the second upright central axis 101 together form a first virtual facade 210, and the intersection line 303 of the first virtual facade 210 and the display module 300 has a midpoint. The midpoint extends in a direction perpendicular to the first direction 10 and parallel to the display module 300 to form a symmetry axis 302. The display module 300 is preferably bilaterally symmetrical with respect to the symmetry axis 302.

[0076] Figure 2B An embodiment of the display module 300 is shown. In this embodiment, the display module 300 includes a display panel 310 and a backlight module 330. The display panel 310 may be, for example, a liquid crystal display panel, and is disposed on the light-emitting side of the backlight module 330. After the light generated by the backlight module 330 reaches the display panel 310, the light is modulated by the display panel 310 to generate image light 301. In this embodiment, the backlight module 330 includes a light source module 700, and the light source module 700 includes a plurality of light-emitting units 710. The light-emitting units 710 are arranged in an array form, such as a chessboard-like row and column arrangement, a hexagonal closest arrangement, or other forms of arrangement. Figure 2B In the illustrated embodiment, the array arrangement of the light emitting units 710 extends along the first direction 10 .

[0077] The backlight module 330 further includes a light-type biasing film 400 disposed on the light-emitting side of the light source module 700. Figure 2B As shown, the optical bias film 400 includes a substrate 410 and a plurality of first prism columns 430. The substrate 410 has a first side 411, and the first side 411 intersects with the first direction 10 and extends along the second direction 20. The substrate 410 also has an upper surface 413, and the plurality of first prism columns 430 are disposed on the upper surface 413 of the substrate 410. In one embodiment, the plurality of first prism columns 430 can be disposed in an integrally formed manner with the substrate 410, for example, by cutting, etching, printing, etc.; however, in different embodiments, the plurality of first prism columns 430 can also be disposed on the substrate 410 in an external manner. The plurality of first prism columns 430 are arranged along the first direction 10; that is, the plurality of first prism columns 430 are closely or spaced adjacent to each other in the first direction 10. In addition, the plurality of first prism columns 430 extend along the second direction 20 respectively.

[0078] Another example Figure 2BAs shown, the optical bias film 400 is bilaterally symmetrical with respect to the symmetry axis 302 of the display module 300 , so that the output light field has good brightness uniformity within the range of the virtual eye area 500 .

[0079] like Figure 3 As shown, the light emitting unit 710 is preferably a light emitting diode and has a light emitting surface 715. The light type biasing film 400 is arranged corresponding to the light emitting side of the light emitting unit 710, that is, opposite to the light emitting surface 715, to receive the source light 810 generated by the light emitting unit 710. The light type biasing film 400 can refract, scatter or otherwise change the light path of the received source light 810 to adjust the emission angle and / or distribution range. Figure 3 As shown, the emission light field generated by at least part of the light-emitting unit 710 is biased in the first direction 10 by part of the first prism column 430 that receives the corresponding source light 810 from above. In the present embodiment, the light field bias is toward the first side edge 411, but is not limited thereto. In the present embodiment, the bias degree of the emission light field of at least part of the first prism column 430 that is farther away from the first side edge 411 (e.g., the first prism column 430b) is less than the bias degree of the emission light field of at least part of the first prism column 430 that is closer to the first side edge 411 (e.g., the first prism column 430a).

[0080] Another example Figure 3 As shown, each first prism column 430 has a first main prism surface 431. The first main prism surface 431 is parallel to the first direction 10 and crosses the second direction 20 in a virtual cross section (i.e. Figure 3 The first prism column 430a has a first main internal angle α1 with the first direction 10 on the surface shown in the figure, and the first main internal angle α1 of at least a portion of the first prism column 430b that is farther away from the first side edge 411 is smaller than the first main internal angle α1 of at least a portion of the first prism column 430a that is closer to the first side edge 411. In addition, each first prism column 430 has a first primary prism surface 433 opposite to the first main prism surface 431. The first primary prism surface 433 is parallel to the first direction 10 and crosses the second direction 20 in a virtual cross section (i.e. Figure 3 The first prism surface 433 has a first internal angle β1 with the first direction 10. In one embodiment, the first internal angle β1 is less than 90 degrees and greater than the first main internal angle α1 to reduce the chance of light passing through the first prism surface 433, thereby reducing the influence of the first prism surface 433 on the light field.

[0081] like Figure 4A and Figure 4BAs shown, the original emission light field 811 (dashed line portion) of the source light 810 passes through the light type biasing film 400 to form a biased emission light field 830 (solid line portion). Specifically, after the source light 810 passes through the light type biasing film 400, the observed biased light field shape distribution forms a distribution with a specific profile. In addition, in a variant embodiment, the field pattern observation of the emission light field 830 can use 50%, 30% or other different standards of the maximum intensity of the light field as the lower limit of the field pattern observation; in other words, light within the set field pattern observation lower limit can be included in the evaluation of the light field pattern profile. In another embodiment, the lower limit of the light intensity included in the field pattern observation may not be set, and all observed light may be included in the field pattern profile evaluation. As shown in FIG. Figure 4B As shown, in the first direction 10 , after the original emission light field 811 passes through the optical biasing film 400 to form the biased emission light field 830 , the viewing angle position of the peak value of the intensity curve thereof is shifted.

[0082] exist Figure 5 In the illustrated embodiment, the substrate 410 has a central portion 415, a first portion 417, and a second portion 419. The first portion 417 is located between the central portion 415 and the first side 411; the second portion 419 is located on the other side of the central portion 415 opposite to the first portion 417, that is, between the central portion 415 and the second side 412 opposite to the first side 411. The first prism column 430 is disposed on the first portion 417, and the second prism column 450 is disposed on the second portion 419. The plurality of first prism columns 450 are arranged along the first direction 10; that is, the plurality of second prism columns 450 are closely or spaced adjacent to each other in the first direction 10. In addition, the plurality of second prism columns 450 extend along the second direction 20, respectively.

[0083] The emission light field generated by at least part of the light emitting unit 710a closer to the first portion 417 is biased in the first direction 10 via the first prism 430a / 430b and the emission light field generated by at least part of the light emitting unit 710b closer to the second portion 419 is biased in the opposite direction via the second prism 450a / 450b. Figure 5 In the illustrated embodiment, the emission light field generated by at least part of the light emitting unit 710a closer to the first portion 417 is biased away from the central portion 415 in the first direction 10 via the first prism column 430a / 430b corresponding to the light received above. On the other hand, the emission light field generated by at least part of the light emitting unit 710b closer to the second portion 419 is biased away from the central portion in the first direction 10 via the second prism column 450a / 450b corresponding to the light received above.

[0084] In this embodiment, the bias degree of at least a portion of the first prism column 430b closer to the central portion 415 for the emitted light field is smaller than the bias degree of at least a portion of the first prism column 430a farther from the central portion 415 for the emitted light field. The bias degree of at least a portion of the second prism column 450b closer to the central portion 415 for the emitted light field is smaller than the bias degree of at least a portion of the second prism column 450a farther from the central portion 415 for the emitted light field. However, the present invention is not limited to this. In addition, the above-mentioned bias degree can be evaluated, for example, by the peak position of the intensity curve in the first direction 10; a greater shift in the peak position can be regarded as a greater bias degree.

[0085] like Figure 5 As shown, each second prism column 450 has a second main prism face 451. The second main prism face 450 is parallel to the first direction 10 and crosses the second direction 20 in a virtual cross section (i.e. Figure 5 The second main internal angle α2 of the second prism column 450b at least partially closer to the central portion 415 is smaller than the second main internal angle α2 of the second prism column 450a at least partially farther from the central portion 415. In addition, for the first prism column 430, the first main internal angle α1 of the first prism column 430b at least partially closer to the central portion 415 is smaller than the first main internal angle α1 of the first prism column 430a at least partially farther from the central portion 415. Through the above arrangement, the emission light field closer to the side can be controlled to have a greater degree of bias.

[0086] In one embodiment, the projection surface 100 may be a curved surface, and has an arc curve on the cross section formed by the first direction 10 and the second direction 20. Preferably, the first main inner angle α1 and the second main inner angle α2 gradually decrease as they are closer to the central portion 415, and the rate of change of the above changes is greater when they are closer to the central portion 415 than when they are farther from the central portion. Through this setting, the brightness uniformity at both ends of the field of view in the first direction 10 can be made closer to that of the central portion of the field of view.

[0087] In addition, each second prism column 450 has a secondary prism surface 453 opposite to the second main prism surface 451. The secondary prism surface 453 is parallel to the first direction 10 and crosses the virtual cross section of the second direction 20 (ie Figure 5 The second prism surface 453 has a second internal angle β2 with the first direction 10. In one embodiment, the second internal angle β2 is less than 90 degrees and greater than the second main internal angle α2 to reduce the chance of light passing through the second prism surface 453, thereby reducing the influence of the second prism surface 453 on the light field.

[0088] In one embodiment, the first main inner angle α1 and / or the second main inner angle α2 is greater than 0 degree and less than or equal to 30 degrees. In another embodiment, the first main inner angle α1 and / or the second main inner angle α2 is greater than 0 degree and less than or equal to 20 degrees. Through the above settings, the brightness uniformity of the overall light field can be controlled to be better, and the obvious difference in brightness is not easily perceived by the user.

[0089] In one embodiment, the light generated by the backlight module 330 that is reflected by the projection surface 100 and enters the virtual eye area 500 has an angle θ1 with the first direction 10 on a virtual cross section parallel to the first direction 10 and transverse to the second direction 20 when leaving the optical bias film 400. The first internal angle β1 and the second internal angle β2 are preferably both less than or equal to the above-mentioned angle θ1 of the light emitted from the adjacent first main prism surface 431 and the second main prism surface 451, wherein the first internal angle β1 and the second internal angle β2 are measured in the same direction as the corresponding angle θ1. With this arrangement, the chance of light passing through the first prism surface 433 and / or the second prism surface 453 can be reduced, thereby reducing the influence of the first prism surface 433 and / or the second prism surface 453 on the light field.

[0090] By making the emission light fields of each light emitting unit 710 biased and differentiated as described above, the overall brightness distribution of the individual emission light fields after combination can be made more uniform. Therefore, the image brightness of the display system can be made more uniform within the overall field of view, and it is less likely that certain image parts will have too low brightness and cause poor visual effects for users.

[0091] In the aforementioned embodiment, the lengths of the first main prism surface 431 and the second main prism surface 451 on a virtual cross section parallel to the first direction 10 and transverse to the second direction 20 are substantially equal, while the lengths of the first prism surface 433 and the second prism surface 453 are shorter when they are close to the central portion 415, and longer when they are close to the two sides. In addition, the first internal angle β1 and the second internal angle β2 are smaller when they are close to the central portion 415, and larger when they are close to the two sides. Relatively speaking, the heights of the first prism column 430 and the second prism column 450 are lower when they are close to the central portion 415 and gradually approach the height of the central portion 415, and are higher when they are close to the two sides. In addition, the vertex angle between the first main prism surface 431 and the first prism surface 433 also remains unchanged. In terms of the process, in the aforementioned embodiment, the above-mentioned structural setting can be achieved by rotating the tool in combination with adjusting the tool height. However, in Figure 3 In the illustrated embodiment, since there is no central portion, processing can be performed by only rotating the cutter without adjusting the height of the cutter.

[0092] In another embodiment, if Figure 6As shown, the first main prism surface 431 has a first length L on a virtual cross section parallel to the first direction 10 and transverse to the second direction 20. The first length L of at least a portion of the first prism column 430b farther from the first side edge 411 is smaller than the first length L of at least a portion of the first prism column 430a closer to the first side edge 411. In addition, the first internal angle β1 and the second internal angle β2 of different first prism columns 430a / 430b are substantially the same. Figure 6 As shown, there is a gap between adjacent first prism columns 430a / 430b, and the gap width W is smaller when approaching the first side edge 411. In addition, the vertex angle between the first main prism surface 431 and the first sub-prism surface 433 increases as approaching the center portion 415. In terms of the process, in this embodiment, the above-mentioned structural setting can be achieved by replacing the tool with or without adjusting the tool height instead of rotating the tool in the process.

[0093] exist Figure 7 In the embodiment shown, Figure 6 Similar to the embodiment of the present invention, the first length L of at least a portion of the first prism column 430b that is farther away from the first side edge 411 is smaller than the first length L of at least a portion of the first prism column 430a that is closer to the first side edge 411. In addition, the first internal angle β1 and the second internal angle β2 of the different first prism columns 430a / 430b are substantially the same. In addition, the vertex angle between the first main prism surface 431 and the first prism surface 433 increases as it approaches the center portion 415. However, Figure 6 The difference of the embodiment shown is that the adjacent first prism columns 430a / 430b are arranged close to each other. In terms of process, in this embodiment, the above structure can be achieved by replacing the cutting tool instead of rotating the cutting tool and adjusting the cutting tool height and spacing.

[0094] like Fig. 8A As shown, the backlight module 330 may include a brightness enhancement film 331. The brightness enhancement film 331 may be a prism, a reflective polarizer, or other forms of optical films. In this embodiment, the brightness enhancement film 331 is disposed between the optical bias film 400 and the light source module 700. This arrangement can reduce the chance of moiré patterns, thereby improving optical quality. Figure 8B In the embodiment shown, the light-type biasing film 400 is disposed between the brightness enhancement film 331 and the light source module 700. With this arrangement, the brightness of the light field can be further improved.

[0095] In another embodiment, if Figure 8CAs shown, the backlight module 330 further includes a first prism sheet 333 and a second prism sheet 335. The first prism sheet 333 and the second prism sheet 335 are stacked in sequence between the light source module 700 and the light type biasing sheet 400. Specifically, the first prism sheet 333 is disposed between the light source module 700 and the light type biasing sheet 400; and the second prism sheet 335 is disposed between the first prism sheet 333 and the light type biasing sheet 400. The first prism sheet 333 and the second prism sheet 335 each have a first prism direction 337 and a second prism direction 339, that is, the prism extension direction on the first prism sheet 333 and the second prism sheet 335; the first prism direction 337 and the second prism direction 339 are perpendicular to each other. Since the first prism 333 and the second prism 335 are vertically arranged, the light pattern can be concentrated in both the horizontal and vertical directions to increase the brightness. The concentrated and brightness-enhanced light pattern is biased by the light pattern biasing sheet 400 to evenly distribute the brightness within the field of view, thereby taking into account the improvement of both brightness and uniformity within the virtual eye area 500.

[0096] In the aforementioned embodiment, the first main prism surface 431 is located on the side of the first prism column 430 facing away from the first side edge 411, that is, the side facing the central portion 415. Specifically, the light generated by the backlight module 330 that is reflected by the projection surface 100 and enters the virtual eye area 500 has an exit angle θ on a virtual cross section parallel to the first direction 10 and transverse to the second direction 20 when leaving the optical bias film 400 (see Figure 5 ).exist Fig. 10A In the embodiment shown, the maximum emission angle θ is 35 degrees; when the intensity of the original emission light field 811 of the light emitting unit 710 at a viewing angle of 35 degrees on the virtual cross section is higher than 80% of the maximum intensity (i.e., peak intensity), the first main prism surface 431 can be arranged on the side of the first prism column 430 facing away from the first side 411, that is, on the side facing the central portion 415. With this arrangement, the situation where the brightness is greater at both ends in the first direction 10 within the field of view can be reduced, thereby improving the degree of brightness uniformity.

[0097] In another embodiment, if Fig. 9 As shown, if the maximum emission angle θ is 35 degrees, when the intensity of the original emission light field 811 of the light emitting unit 710 at a viewing angle of 35 degrees on the above virtual cross section is lower than 80% of the maximum intensity (ie, peak intensity), then Fig. 10B In the embodiment shown, the first main prism surface 431 is located on the side of the first prism column 430 facing the first side edge 411, that is, the side facing away from the central portion 415. Fig. 10BIn the illustrated embodiment, the emission light field generated by at least part of the light emitting unit 710a closer to the first portion 417 is biased toward the central portion 415 in the first direction 10 via the first prism column 430 corresponding to the light received above. On the other hand, the emission light field generated by at least part of the light emitting unit 710b closer to the second portion 419 is biased toward the central portion in the first direction 10 via the second prism column 450 corresponding to the light received above. In other words, the light field bias generated by the first prism column 430 and the light field bias of the second prism column 450 are in opposite directions. Through this arrangement, the condition of insufficient brightness at both ends in the first direction 10 within the field of view can be reduced to improve the degree of brightness uniformity.

[0098] Fig.11 FIG. 1 is another embodiment of the display system. In this embodiment, the projection surface 100 is a concave surface, such as a concave hyperboloid, and is inclined relative to the line of sight (e.g., the second direction 20). The projection surface 100 has a first section 110 on a second virtual elevation 220 perpendicular to the second direction 20, and the first section 110 has a first curvature. In addition, the display module 300 is a curved display module, and its display surface is also a curved surface. The display module 300 also has a second section 320 on the second virtual elevation 220, and the second section 320 has a second curvature. Fig.11 As shown, the first cross section 110 and the second cross section 320 are respectively concave in directions away from each other, and the first curvature is greater than the second curvature. In one embodiment, the second curvature is substantially 50% of the first curvature, but is not limited thereto. By designing that the first curvature is greater than the second curvature, the width (H direction) and height (V direction) of the full range 511 can be reduced, greatly reducing the design difficulty of the light pattern adjustment unit 713, wherein the 50% effect is preferred.

[0099] Fig.12 FIG. 3 is a schematic diagram of the display module 300 on the aforementioned second cross section 320. Fig.12 As shown, the backlight module 330 of the display module 300 has a light source module 700 composed of a plurality of light emitting units 710. In this embodiment, the plurality of light emitting units 710 may also be arranged in a concave manner, that is, the arrangement of the plurality of light emitting units 710 is concave in a direction away from the light type biasing film 400. Through this arrangement, the original emission light field of each light emitting unit 710 can generate an angle relative to the plane where the first direction 10 and the second direction 20 are located, which can supplement the angle deficiency of the first main prism surface 431 and / or the second main prism surface 451, so as to further improve the brightness uniformity within the overall image field of view.

Claims

1. A light-type biasing film, suitable for a backlight module, the backlight module has a light source module, the light source module has a light-emitting side for the light-type biasing film and a plurality of light-emitting units arranged in an array, the light-type biasing film comprising: A substrate having a first side edge, the first side edge intersecting the first direction and extending along a second direction; and A plurality of first prism columns are disposed on the substrate, the first prism columns are arranged along the first direction and extend along the second direction respectively, wherein each of the first prism columns has a first main prism surface; in, The emission light fields generated by at least a portion of the light emitting units are biased in the first direction at least partially through the first prism columns.

2. The optical bias film as claimed in claim 1, wherein the substrate has a central portion, a first portion located between the central portion and the first side, and a second portion located on the other side of the central portion; the first prisms are disposed on the first portion, and the optical bias film further comprises: A plurality of second prism columns are disposed in the second portion, the second prism columns are arranged along the first direction and extend along the second direction respectively, wherein each of the second prism columns has a second main prism surface; in, The emission light fields generated by at least some of the light emitting units closer to the first portion are biased in the first direction via the first prism columns in an opposite direction to the emission light fields generated by at least some of the light emitting units closer to the second portion are biased in the first direction via the second prism columns.

3. The optical bias film as claimed in claim 2, wherein the bias degree of at least a portion of the first prism columns closer to the central portion to the emitted light field is smaller than the bias degree of at least a portion of the first prism columns farther from the central portion to the emitted light field.

4. The optical bias film as described in claim 2, wherein the first main prism surface has a first main internal angle with the first direction on a virtual cross-section parallel to the first direction and transverse to the second direction, and the first main internal angle of at least part of the first prism columns closer to the central portion is smaller than the first main internal angle of at least part of the first prism columns farther from the central portion; the second main prism surface has a second main internal angle with the first direction on the virtual cross-section, and the second main internal angle of at least part of the second prism columns closer to the central portion is smaller than the second main internal angle of at least part of the second prism columns farther from the central portion. 5 . The optical biasing film as claimed in claim 1 , wherein the bias degree of at least a portion of the first prism columns farther from the first side edge to the emitted light field is smaller than the bias degree of at least a portion of the first prism columns closer to the first side edge to the emitted light field.

6. The optical bias film as described in claim 1, wherein the first main prism surface has a first main internal angle with the first direction on a virtual cross-section parallel to the first direction and transverse to the second direction, and the first main internal angle of at least part of the first prism columns farther away from the first side edge is smaller than the first main internal angle of at least part of the first prism columns closer to the first side edge.

7. The light-type biasing film as described in claim 2, wherein the first main prism surface and the second main prism surface are respectively located on the surfaces of the first prism column and the second prism column facing the central part, and at least part of the emission light field generated by the light-emitting units is biased toward the central part in the first direction through at least part of the first prism columns.

8. The light-type biasing film as described in claim 2, wherein the first main prism surface and the second main prism surface are respectively the surfaces of the first prism column and the second prism column facing away from the central part, and at least part of the emitted light field generated by the light-emitting units is biased away from the central part in the first direction through at least part of the first prism columns. 9 . The optical bias film as claimed in claim 4 , wherein the first main inner angle or the second main inner angle is greater than 0 degree and less than or equal to 30 degrees. 10 . The optical bias film as claimed in claim 4 , wherein the change rate of the first main inner angle and the second main inner angle is greater when the angle is closer to the central portion than when the angle is farther from the central portion.

11. The optical bias film as described in claim 4 or 6, wherein each of the first prism columns has a first sub-prism surface opposite to the first main prism surface, the first sub-prism surface has a first sub-internal angle with the first direction on the virtual cross section, and the first sub-internal angle is less than 90 degrees and greater than the first main internal angle.

12. The optical bias film as described in claim 1, wherein the first main prism surface has a first length on a virtual cross-section parallel to the first direction and transverse to the second direction, and the first length of at least a portion of the first prism columns farther away from the first side edge is smaller than the first length of at least a portion of the first prism columns closer to the first side edge.

13. The optical bias film as claimed in claim 12, wherein the first prism columns are spaced apart from each other, wherein: The spacing distance between at least a portion of the first prism columns farther from the first side is greater than the spacing distance between at least a portion of the first prism columns closer to the first side.

14. The light-type bias film as described in claim 1, wherein the arrangement of the light-emitting units on a virtual cross-section parallel to the first direction and transverse to the second direction forms a second curvature and is recessed in a direction away from the light-type bias film, and the light generated by the light-emitting units passes through the light-type bias film and reaches a projection surface, the projection surface has a first cross-section on the virtual cross-section, and the first cross-section has a first curvature; wherein the first curvature is greater than the second curvature. 15 . The light-type biasing film as claimed in claim 1 , wherein the backlight module further comprises a brightness enhancement film, and the light-type biasing film is located between the brightness enhancement film and the light source module.

16. The optical bias film according to claim 1, wherein the backlight module further comprises: a first prism sheet disposed between the light-type biasing film and the light source module and having a first prism direction; and a second prism sheet, between the optical biasing film and the first prism sheet, and having a second prism direction; in, The first prism direction is perpendicular to the second prism direction.

17. A display system comprising: A projection screen, A display module includes a backlight module, the backlight module has a light source module, the light source module has a light emitting side and a plurality of light emitting units arranged in an array; and The light-type biasing film as claimed in any one of claims 1 to 16, arranged on the light-emitting side; and a virtual eye area; The display module is arranged relative to the projection surface and generates an image light which is reflected by the projection surface to generate an image at least on the virtual eye area.

18. A display system as described in claim 17, wherein the virtual eye area has a first vertical central axis, the projection surface has a second vertical central axis, the first vertical central axis and the second vertical central axis together form a virtual facade, an intersection line of the virtual facade and the display module has a midpoint, the midpoint extends in a direction perpendicular to the first direction and parallel to the display module to form a symmetry axis, and the optical bias film is bilaterally symmetrical with respect to the symmetry axis.

19. A display system as described in claim 17, wherein the light generated by the backlight module that is reflected by the projection surface and enters the virtual eye area has a maximum exit angle of θ on a virtual cross section parallel to the first direction and transverse to the second direction when leaving the light-type bias film, and when the intensity of the emitted light field of the light-emitting units at a viewing angle of θ on the virtual cross section is lower than 80% of the maximum intensity, the first main prism surface is located on the side of the first prism column facing the first side.

20. A display system as described in claim 17, wherein the light generated by the backlight module that is reflected by the projection surface and enters the virtual eye area has a maximum exit angle of θ on a virtual cross section parallel to the first direction and transverse to the second direction when leaving the light-type bias film, and when the intensity of the emitted light field of the light-emitting units at a viewing angle of θ on the virtual cross section is higher than 80% of the maximum intensity, the first main prism surface is located on a side of the first prism column that is away from the first side.

21. A display system as described in claim 17, wherein the light generated by the backlight module that is reflected by the projection surface and enters the virtual eye area has a maximum exit angle of θ on a virtual cross section parallel to the first direction and transverse to the second direction when leaving the light type bias film, and each of the first prism columns has a first prism surface opposite to the first main prism surface, and the first prism surface has a first internal angle with the first direction on the virtual cross section, and the first internal angle is less than or equal to the maximum exit angle θ.

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