Head-up display device

Abstract

To provide a head-up display device capable of suppressing deterioration of display quality.SOLUTION: The head-up display device includes: a display surface 21 for radiating display light L; a display panel 22 with a bezel 22b formed in the shape of an outside frame surrounding the display surface 21; and a prism 40 attached to the display surface 21 with an adhesive layer 27a in between, the prism transmitting display light L. The prism 40 is formed on a part of the bezel 22b when viewed from a Z-direction perpendicular to the display surface 21.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a head-up display device. [Background technology]

[0002] The head-up display device described in Patent Document 1 includes a prism that refracts light transmitted through a liquid crystal layer so that the light transmitted through the liquid crystal layer is inclined at a tilt angle with respect to a display surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6200798 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, for example, if the viewpoint is located at the edge of the eyebox, some of the display light passing through the side of the prism on its way to reaching this viewpoint may degrade the display quality of the virtual image.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a head-up display device that can suppress deterioration of display quality. [Means for solving the problem]

[0006] In order to achieve the above object, a head-up display device according to the present disclosure includes: a display panel having a display surface that emits display light and a bezel formed in a frame shape surrounding the display surface; a light-transmitting member that is directly or indirectly attached to the display surface and transmits the display light; The light-transmitting member is formed so as to overlap at least a portion of the bezel when viewed in a direction perpendicular to the display surface. Effect of the Invention

[0007] According to the present disclosure, degradation of display quality can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of a head-up display device according to a first embodiment of the present disclosure. [Diagram 2] 1 is a perspective view of a prism and a display panel according to a first embodiment of the present disclosure. [Diagram 3] 1 is an exploded perspective view of a prism and a display panel according to a first embodiment of the present disclosure. [Figure 4] 1 is a schematic cross-sectional view of a display device according to a first embodiment of the present disclosure. [Diagram 5] FIG. 11 is a perspective view of a prism according to a second embodiment of the present disclosure. [Figure 6] FIG. 11 is a perspective view of a prism according to a third embodiment of the present disclosure. [Figure 7] 10 is a schematic cross-sectional view of a display device according to a modified example of the first embodiment of the present disclosure. FIG. [Figure 8] 10 is a schematic cross-sectional view of a display device according to a modified example of the first embodiment of the present disclosure. FIG. [Figure 9] FIG. 11 is a schematic cross-sectional view of a display device according to a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (First embodiment) A head-up display device according to a first embodiment of the present disclosure will be described with reference to the drawings. As shown in FIG. 1, the head-up display device 100 is mounted on the dashboard of a vehicle 200, which is an example of a moving body. The head-up display device 100 projects a display light L onto a windshield 201, which is an example of a projection target member, to generate a virtual image V1 (display image ) is displayed. When the viewpoint EP of the viewer 1 is within the visible region R (so-called eye box), the viewer 1 can view the virtual image V1. The virtual image V1 is displayed within a virtual image display virtual region K1. The virtual image display virtual region K1 is formed of an immaterial flat or curved surface. The visible region R is virtually formed as a rectangle that is long in the left-right direction of the viewer 1. When the viewpoint EP moves from within the visible region R to outside it, the brightness of the virtual image V1 viewed by the viewer 1 drops significantly.

[0010] The virtual image display virtual area K1 extends along the road surface. Here, "along the road surface" means that the virtual image display virtual area K1 is at an angle of less than ±45° with respect to the horizontal direction. In this example, the virtual image display virtual area K1 is inclined upward as it moves away from the viewer 1.

[0011] The virtual image V1 is displayed along the road surface, which is a real landscape as seen by the viewer 1. The virtual image V1 includes information associated with the road surface, for example, symbol information such as route guide arrows. The virtual image V1 also includes character information or sign information such as vehicle speed. Characters include numbers, alphabets, hiragana, katakana, kanji, etc. The virtual image V1 may also include icons indicating structures standing on the ground, such as buildings or trees.

[0012] Next, the configuration of the head-up display device 100 will be described. The head-up display device 100 includes a concave mirror 12 which is an optical relay, a display device 20, an illumination device 25, a control unit 26, and a housing 30.

[0013] The housing 30 is formed in a box shape from light-shielding resin or metal. The concave mirror 12, the display device 20, and the lighting device 25 are housed inside the housing 30. The housing 30 includes a window 31 made of a light-transmitting member that transmits the display light L generated in the internal space of the housing 30 toward the windshield 201.

[0014] The illumination device 25 has a plurality of LEDs (Light Emitting Diodes) and emits illumination light. The display device 20 receives the illumination light from the illumination device 25 and emits display light L. A specific configuration of the display device 20 will be described later.

[0015] The concave mirror 12 has a reflective surface 12a that is concavely curved along the height and width directions of the vehicle. The concave mirror 12 reflects the display light L that has passed through a prism 40 (described later) of the display device 20 toward the windshield 201. The concave mirror 12 reflects the display light L from the display surface 21 toward the windshield 201 so as to enlarge the light. The reflective surface 12a of the concave mirror 12 faces toward the upper rear side of the vehicle 200. The concave mirror 12 has a function of suppressing distortion of a virtual image caused by reflection on the windshield 201.

[0016] The control unit 26 includes a CPU (Central Processing Unit), a GDC (Graphics Display Controller), a ROM (Read Only Memory), and a RAM (Random Access Memory), etc. The control unit 26 acquires information such as vehicle speed and route guidance from the outside, and generates an image to be displayed on the display device 20 based on this information.

[0017] As shown in FIG. 4, the display device 20 includes a display panel 22, a prism 40, a display case 23, a light-transmitting member 24, and adhesive layers 27a and 27b.

[0018] 2 and 3, the display panel 22 is a TFT (Thin Film Transistor) type liquid crystal panel. The display panel 22 is formed in a rectangular plate shape. In the following description, the longitudinal direction and vehicle width direction of the display panel 22 are defined as the X direction, the lateral direction of the display panel 22 is defined as the Y direction, and the thickness direction of the display panel 22 is defined as the Z direction. The X direction corresponds to the left-right direction of the virtual image V1 as viewed by the viewer 1, and the Y direction corresponds to the height direction of the virtual image V1 as viewed by the viewer 1. The display panel 22 receives illumination light from the illumination device 25 and emits display light L that displays an image. The light exit surface of the display panel 22 is the display surface 21 that displays the image. In other words, the display surface 21 does not mean the entirety of a predetermined surface of the display panel 22, but at least the surface on which an image is actually displayed. The display surface 21 is also called an active area. 1, the display surface 21 faces the forward downward direction of the vehicle 200. The image displayed on the display surface 21 is subjected to distortion correction (warping) for correcting distortion of the virtual image V1 viewed by the viewer 1. The display surface 21 is inclined non-perpendicularly to the optical axis center La of the display light L (a light ray connecting the center of the display surface 21 and the center of the visible region R). The optical axis center La is located at the center of the cross section of the display light L.

[0019] 3 and 4, the display panel 22 includes a liquid crystal unit 22a and a bezel 22b. The liquid crystal unit 22a is shaped like a rectangular plate. The bezel 22b is made of metal and is shaped like a frame that surrounds the periphery of the liquid crystal unit 22a. The bezel 22b has a U-shaped cross section so as to embrace the outer periphery of the liquid crystal unit 22a. Bezel 22b has four sides 22b1 to 22b4 that are connected together to form a rectangular frame as a whole. Two sides 22b1 and 22b2 are located on both sides of bezel 22b in the X direction and extend parallel to the Y direction. The remaining two sides 22b3 and 22b4 are located on both sides of bezel 22b in the Y direction and extend parallel to the X direction.

[0020] The light-transmitting member 24 is adhered to the light incident surface of the display panel 22 (liquid crystal section 22a) via an adhesive layer 27b. The light-transmitting member 24 is in the form of a rectangular plate covering the light incident surface of the display panel 22. The light-transmitting member 24 is formed of a light-transmitting member, for example, glass or a transparent optical resin. The light-transmitting member 24 functions as a spacer that fills gaps in the display case 23 and / or a heat storage member that receives heat from the display panel 22.

[0021] The prism 40 is located above the display surface 21 and is a light-transmitting member through which the display light L emitted from the display surface 21 passes. The prism 40 is adhered to the display surface 21 of the display panel 22 via an adhesive layer 27a. The adhesive layers 27a and 27b are optical adhesives, so-called OCR (Optical Clear Resin). do.

[0022] The prism 40 is made of a material having a refractive index n larger than that of air (n=1), such as glass or transparent optical resin. Examples of transparent optical resin include acrylic resin and cyclic olefin resin. The prism 40 is a wedge prism, and is formed in a wedge shape that covers the display surface 21.

[0023] As shown in FIG. 1, the prism 40 forms a virtual display plane 48A inside. The virtual display plane 48A is the apparent position of the display surface 21, which is the original display plane. This is because, at the viewpoint EP, the display surface 21 is indirectly viewed by receiving the display light L passing through the prism 40, and at this time, due to the influence of the refractive index n of the prism 40, the display surface 21 appears to the viewer as if it exists on the virtual display plane 48A. For example, in this embodiment, the display surface 21 appears to exist on the virtual display plane 48A due to the action of the prism 40. The virtual display plane 48A is inclined at an angle larger than that of the display surface 21 with respect to the optical axis center La of the display light L. Therefore, it is possible to increase the inclination angle α of the virtual image V1 as seen by the viewer 1 without excessively increasing the inclination angle of the display surface 21 with respect to the optical axis center La. The inclination angle α is the angle at which the virtual image V1 inclines with respect to the vehicle height direction, and when the inclination angle α is 90°, the virtual image V1 becomes parallel to the horizontal road surface. By increasing the inclination angle α, the viewer 1 is more likely to feel a sense of unity between the virtual image V1 and the road surface, resulting in excellent visibility. Here, if the inclination angle of the display surface 21 is made too large, the light transmittance of the display light L of the display panel 22 decreases, and the brightness and contrast of the virtual image V1 decrease. In this regard, in this embodiment, the action of the prism 40 prevents the inclination angle of the display surface 21 from becoming too large, so that the brightness and contrast of the virtual image V1 can be maintained.

[0024] 2 and 3, the prism 40 is provided with a light incident surface 41i that faces the display surface 21 and receives the display light from the display surface 21, and a light exit surface 41o that is located on the opposite side of the light incident surface 41i and exits the incident display light L. The light incident surface 41i is formed in a rectangular flat surface. The light incident surface 41i of the prism 40 is fixed to face the display surface 21 by an adhesive layer 27a.

[0025] Prism 40 has four sides 22b1 to 22b4 that are connected together to form a rectangular frame as a whole. Two sides 22b1 and 22b2 are located on both sides of bezel 22b in the X direction and extend parallel to the Y direction. The remaining two sides 22b3 and 22b4 are located on both sides of bezel 22b in the Y direction and extend parallel to the X direction.

[0026] The light entrance surface 41i of the prism 40 is positioned to face the entire display surface 21 and the upper surfaces of the sides 22b1, 22b2 of the bezel 22b in the X direction. The light entrance surface 41i of the prism 40 is positioned within the display surface 21 in the Y direction and is separated from the sides 22b3, 22b4 without reaching them.

[0027] The light exit surface 41o is formed to be inclined with respect to the light entrance surface 41i so that the thickness of the prism 40 increases toward the upper side in the Y direction. The inclination angle of the light exit surface 41o determines the inclination angle of the virtual display plane 48A with respect to the optical axis center La.

[0028] The prism 40 has a plurality of side surfaces 40A to 40F. The side surfaces 40A and 40B are orthogonal to the light incident surface 41i, are located on both sides of the prism 40 in the X direction, and extend parallel to the Y direction. As shown in FIG. 4, the two side surfaces 40A and 40B coincide with the side surfaces of the two sides 22b1 and 22b2 of the bezel 22b extending in the Y direction in the Z direction (the emission direction of the display light L). That is, the total length of the prism 40 in the X direction is substantially the same as the total length of the display panel 22 in the X direction. The prism 40 and the display panel 22 overlap when viewed from the Z direction so as not to be misaligned in the X direction.

[0029] Note that, without being limited to this example, as shown in FIG. 7, the two side surfaces 40A, 40B of the prism 40 may be positioned opposite to the upper surfaces of the two side portions 22b1, 22b2 of the prism 40 in the Z direction (the emission direction of the display light L). 8, the two side surfaces 40A, 40B may be located outward in the X direction from the side surfaces of the two sides 22b1, 22b2 of the bezel 22b that extend in the Y direction. That is, the prism 40 may be larger in size than the display panel 22 in the X direction and may be set in a range that includes the display panel 22 when viewed from the Z direction.

[0030] 2 and 3, the side surface 40C is perpendicular to the light incident surface 41i, is located on the opposite side of the prism 40 in the Y direction from the side surfaces 40D to 40F, and extends in the X direction. The side surfaces 40D to 40F each extend in the X direction and are arranged in the Y direction in different directions. The side surface 40D intersects with the light incident surface 41i at an obtuse angle. The side surface 40E is located between the side surfaces 40D and 40F and is perpendicular to the light incident surface 41i. The side surface 40F is located between the side surface 40E and the light exit surface 41o and extends at an obtuse angle with the side surface 40E and the light exit surface 41o.

[0031] As shown in Fig. 4, the display case 23 houses an integrated body in which the prism 40 and the light-transmitting member 24 are bonded to the display panel 22 via adhesive layers 27a and 27b. The display case 23 is formed of a light-shielding resin or metal. The display case 23 includes a frame portion 23a that surrounds the outer periphery of the light exit surface 41o of the prism 40. The frame portion 23a has a rectangular frame plate shape that is long in the X direction. The display light L emitted from the light exit surface 41o of the prism 40 passes through a rectangular light passing hole of the frame portion 23a.

[0032] The size of the light passing hole of the frame portion 23a is set based on an angle range θ corresponding to the viewing angle. This viewing angle is an angle range in which the virtual image V1 is visible when the viewer 1 moves the viewpoint EP in the left-right direction, and specifically, is an angle formed by a straight line connecting the center of the virtual image display virtual area K1 to the left end of the visible area R and a straight line connecting the center of the virtual image display virtual area K1 to the right end of the visible area R. The angle range θ corresponding to the viewing angle is set to a diffusion angle of the display light L in the display device 20 for setting the viewing angle to a desired value. A clearance CL is set between the inner peripheral edge of the light passing hole of the frame portion 23a and the angle range θ. By setting the clearance CL, the frame portion 23a does not block the display light L diffusing in the angle range θ.

[0033] Here, the angle of the light ray of the display light L that reaches the viewpoint EP changes depending on the position of the viewpoint EP of the viewer 1 in the visible region R. For example, when the viewpoint EP of the viewer 1 is located at the left end or the right end of the visible region R, the light rays L1 and L2 of the display light L along the angle farthest from the optical axis center La of the angle range θ reach the viewpoint EP. As described above, by setting the size of the prism 40 to be equal to or larger than the size facing the bezel 22b in the Z direction, the light rays L1 and L2 pass through the prism 40 in its thickness direction and do not pass through the side surfaces 40A and 40B of the prism 40. Therefore, the display quality of the virtual image V1 when the viewpoint EP is located at the left end or the right end of the visible region R is not deteriorated. 9, as a comparative example, the size of the prism 140 in the X direction is configured to be smaller than that of the prism 40 of the present embodiment so that the side surfaces 140A, 140B of the prism 140 face the liquid crystal section 22a of the display panel 22 in the Z direction. In this case, when the viewpoint EP is located at the left end or right end of the visible region R, the rays L1, L2 of the display light L pass through the side surfaces 140A, 140B and corners of the prism 140, degrading the display quality of the virtual image. As described above, in this embodiment, by setting the size of the prism 40 in the X direction to be equal to or larger than the size at which the side surfaces 40A, 40B of the prism 40 face the bezel 22b in the Z direction, degradation of the display quality of the virtual image V1 can be suppressed.

[0034] (effect) According to the first embodiment described above, the following effects are achieved. (1) The head-up display device 100 includes a display panel 22 having a display surface 21 that emits display light L, and a prism 40 that is indirectly bonded to the display surface 21 via an adhesive layer 27a and is an example of a translucent member through which the display light L passes. The prism 40 is formed so as to overlap a part of the bezel 22b when viewed from the Z direction perpendicular to the display surface 21. According to this configuration, regardless of movement of the viewpoint EP of the viewer 1, the rays L1 and L2 of the display light L pass through the prism 40 in its thickness direction, and do not pass through the side surfaces 40A and 40B of the prism 40. This makes it possible to suppress deterioration in the display quality of the virtual image V1.

[0035] (2) The head-up display device 100 displays a virtual image V1 by projecting the display light L onto a windshield 201, which is an example of a projection target member. The prism 40 includes a light entrance surface 41i, on which the display light L is incident, which is parallel to the display surface 21, and which is indirectly bonded to the display surface 21 via an adhesive layer 27a, and a light exit surface 41o, from which the display light L exits and which is inclined with respect to the light entrance surface 41i. The inclination angle α of the virtual image V1 as viewed by the viewer 1 is adjusted depending on the inclination angle of the light exit surface 41o with respect to the light entrance surface 41i. Even in a configuration in which the prism 40 is bonded to the display surface 21, degradation in the display quality of the virtual image V1 can be suppressed. In particular, since the prism 40 needs to have a thickness in order to adjust the inclination angle α of the virtual image V1, the structure naturally results in the side surfaces 40A and 40B of the prism 40 being easily indirectly viewed by the viewer. In such a structure, by forming the prism 40 to a size that overlaps with the bezel 22b as described above, it is possible to suppress a decrease in the display quality of the virtual image V1.

[0036] Second embodiment A head-up display device according to a second embodiment of the present disclosure will be described with reference to the drawings. This embodiment differs from the first embodiment in that a light-shielding portion is partially formed on the prism. The following description will focus on the differences from the first embodiment.

[0037] 5, light-shielding portions 43C-43F, 43i made of a light-blocking layer are partially formed on the prism 40. The light-shielding portions 43C-43F, 43i are made of a black-based printed layer and block the light reflected by the bezel 22b from reaching the viewer. The light-shielding portion 43C is formed over the entire area of ​​the side surface 40C of the prism 40. The light-shielding portion 43D is formed over the entire area of ​​the side surface 40D of the prism 40. The light-shielding portion 43E is formed over the entire area of ​​the side surface 40E of the prism 40. The light-shielding portion 43F is formed over the entire area of ​​the side surface 40F of the prism 40. The light shielding portion 43i is formed in a frame shape on the outer periphery side of the light incident surface 41i of the prism 40. The light shielding portion 43i is formed continuously with the light shielding portions 43C and 43D.

[0038] In this embodiment, the region where the light shielding portion of the prism 40 is formed can be changed. For example, any one of the light shielding portions 43C to 43F and 43i may be omitted. Also, any one of the light shielding portions 43C and 43D to 43F may be omitted. Furthermore, a light shielding portion may be formed on at least one of the side surfaces 40A and 40B. Also, a frame-shaped light shielding portion may be formed on the outer periphery of the light exit surface 41o of the prism 40.

[0039] (effect) According to the second embodiment described above, the following effects are achieved. The prism 40 includes light-shielding portions 43C to 43F, 43i formed on the outer periphery of a light entrance surface 41i, which is the back surface of the prism 40 facing the bezel 22b, and on the side surfaces 40A to 40F of the prism 40. According to this configuration, the light-shielding portions 43C to 43F, 43i block the light reflected by the bezel 22b from reaching the viewer, and deterioration in the display quality of the virtual image V1 can be suppressed. In particular, due to the presence of the prism 40, the light reflected by the bezel 22b is likely to reach the viewer indirectly due to the structure, so it is preferable to provide the light blocking portions 43C to 43F, 43i.

[0040] Third embodiment A head-up display device according to a third embodiment of the present disclosure will be described with reference to the drawings. This embodiment differs from the second embodiment in that a rough surface is partially formed as a light-shielding portion on the prism. The following mainly describes the differences from the second embodiment.

[0041] 6, side surfaces 40A to 40F of prism 40 are formed as rough surfaces having a rougher surface than light incident surface 41i and light exit surface 41o. Fine irregularities are formed on side surfaces 40A to 40F. Light is less likely to transmit through side surfaces 40A to 40F than through light incident surface 41i and light exit surface 41o.

[0042] A method for manufacturing the prism 40 according to this embodiment will be described. First, a prism material having a rough surface is prepared. Then, the surfaces of this prism material corresponding to the light entrance surface 41i and the light exit surface 41o are mirror-finished. This completes the prism 40 according to this embodiment. This manufacturing method eliminates the need for processing to roughen the surfaces of the side surfaces 40A to 40F. The method for manufacturing the prism 40 is not limited to this, and may include a step of roughening the surfaces of the side surfaces 40A to 40F.

[0043] In this embodiment, the frame-shaped portion on the outer periphery of at least one of the light entrance surface 41i and the light exit surface 41o may be formed as a rough surface. Furthermore, any of the side surfaces 40A to 40F does not have to be a rough surface.

[0044] (effect) According to the third embodiment described above, the following effects are achieved. The prism 40 includes a light incident surface 41i on which the display light L is incident, and a light exit surface 41o from which the display light L exits. The side surfaces 40A to 40F of the prism 40 are formed as rough surfaces having a surface roughness greater than that of the light incident surface 41i and the light exit surface 41o. According to this configuration, since the side surfaces 40A to 40F are rough surfaces, even if stray light passes through the side surfaces 40A to 40F, the light intensity is weakened and the light is less likely to be recognized by the viewer, and deterioration in the display quality of the virtual image V1 can be suppressed.

[0045] (Fourth embodiment) A head-up display device according to a fourth embodiment of the present disclosure will be described. This embodiment is different from the second embodiment in that a bezel is not formed on the display panel. The following mainly describes the differences from the second embodiment.

[0046] In the above embodiment, the prism 40 is configured to have light-shielding portions 43C-43F, 43i formed in portions thereof to block light reflected by the bezel 22b from reaching the viewer. However, in this embodiment, the light-shielding portions of the prism are arranged to block light reflected by the outer periphery (outer periphery end) of the display panel from reaching the viewer.

[0047] Specifically, in this head-up display device, compared to the configuration in Figure 4, the bezels 22b1, 22b2 of the display panel 22 are eliminated, and the prism 40 has a light-shielding portion formed so that the outer periphery of the display panel 22 (the edges and ends positioned to surround the display surface 22a) cannot be seen through the light-transmitting holes of the frame portion 23.

[0048] When the display panel 22 does not have a bezel, there is no unnecessary light caused by the bezel. On the other hand, a transparent plate such as glass (sealing glass or protective glass) or a protective plate (e.g., made of synthetic resin) is located on the top surface of the liquid crystal part 22a of the display panel 22, and the outer periphery of the transparent plate (display panel 22) that was conventionally covered by a bezel becomes easily visible.

[0049] Here, if unwanted light reaches the outer periphery, it may be visually recognized by a viewer through the light passing holes of the frame portion 23. In this case, the viewer visually recognizes the unwanted light as a sparkling frame-shaped image or the like.

[0050] Therefore, even if the display panel 22 does not have a bezel, the prism 40 forms a light-shielding portion that covers the outer periphery of the display panel 22, thereby making it possible to suppress degradation of display quality caused by unnecessary light. Therefore, even with this configuration, degradation in the display quality of the virtual image can be suitably suppressed even in cases where the display device 20 does not have the bezel 22b.

[0051] If the display device is an electronic display device such as a liquid crystal display device or an organic EL display device, the transparent plate has the above-mentioned exemplary configuration. If the display device is a projection display device (including a DMD, LCOS (Liquid Crystal On Silicone), TFT, etc.), the transparent plate is composed of a screen, etc.

[0052] (effect) According to the fourth embodiment described above, the following effects are achieved. (2-1) The head-up display device includes a display panel 22 having a display surface 21 that emits display light L and a bezel 22b formed in a peripheral frame shape surrounding the display surface 21, and a prism 40 that is indirectly bonded to the display surface 21 via an adhesive layer 27a and is an example of a translucent member through which the display light L passes. The prism 40 includes light-shielding portions 43C to 43F, 43i formed on the outer periphery of a light incident surface 41i, which is a back surface facing the display panel 22, and on side surfaces 40A to 40F of the prism 40.

[0053] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) can be made as appropriate within the scope of the present disclosure. An example of a modification will be described below.

[0054] (Modification) In the second embodiment, the light blocking portions 43C to 43F, 43i are printed layers formed by printing, but are not limited to this. They may be separate members made of light blocking resin or metal and separate from the prism 40. The above second and third embodiments may be combined to form a light-shielding portion on a part of the prism 40 and a rough surface on another part of the prism 40, or further, a light-shielding portion may be formed on the rough surface.

[0055] In each of the above embodiments, the size of the prism 40 in the Y direction may be similarly increased. Specifically, the light entrance surface 41i of the prism 40 may be formed to have a size that overlaps with at least a part of the two side portions 22b3, 22b4 of the bezel 22b. This prevents the rays of the display light L from passing through any of the side surfaces 40C to 40F and reaching the viewpoint EP when the viewpoint EP is moved in the vertical direction, thereby preventing a decrease in the display quality of the virtual image V1.

[0056] In each of the above embodiments, both of the sides 40A, 40B of the prism 40 coincide with the sides of the sides 22b1, 22b2 of the bezel 22b in the Z direction or face the upper surfaces of the sides 22b1, 22b2, but either one of the sides 40A, 40B may coincide with the sides of the sides 22b1, 22b2 in the Z direction or face the upper surfaces of the sides 22b1, 22b2, and the other of the sides 40A, 40B may face the display surface 21.

[0057] In each of the above embodiments, it is possible to appropriately change the shape of the prism 40. For example, the side surfaces 40D to 40F of the prism 40 may be formed as a single flat surface that is perpendicular to the light incident surface 41i. In each of the above embodiments, the prism 40 is a light-transmitting member that adjusts the direction of the virtual image V1, but it may be a light-transmitting member that adjusts the display light L for a purpose other than this. In each of the above embodiments, the prism 40 and the light-transmitting member 24 were adhered to the display panel 22 via adhesive layers 27a, 27b, but the adhesive layers 27a, 27b may be omitted, and the display panel 22, the prism 40 and the light-transmitting member 24 may each be held within the display case 23.

[0058] In each of the above embodiments, the display device 20 is not limited to a configuration including a liquid crystal display panel, and may be a configuration including an organic EL (Electro Luminescence), DMD (Digital Micro mirror Device), or MEMS (Micro Electro Mechanical Systems) mirror. In each of the above-described embodiments, the head-up display device 100 is mounted on a vehicle, but the present invention is not limited to this and may be mounted on a vehicle such as an airplane, a ship, etc. In addition, the projection target member is not limited to the windshield 201 and may be a dedicated combiner. In addition, the display device 20 may be applied to a device other than the head-up display device 100. [Explanation of symbols]

[0059] 1. Viewer 12 Concave mirror 12a Reflective surface 20 Display device 21 Display surface 22 Display Panel 22a LCD section 22b Bezel 22b1~22b4 Side part 23 Display case 23a Frame 24 Translucent material 25 Lighting Equipment 26 Control Unit 27a,27b Adhesive layer 30 Case 31 Window 40,140 Prism 40A~40F, 140A, 140B Side 41i Light incidence surface 41o Light exit surface 43C~43F,43i Light shielding part 48A Virtual Display Plane 100 Head-up display device 200 vehicles 201 Windshield θ Angle range α Inclination angle L display light La optical axis center K1 Virtual image display virtual area L1,L2 rays R visible range V1 Virtual Image CL Clearance EP Perspective

Claims

1. a display panel having a display surface that emits display light and a bezel formed in a frame shape surrounding the display surface; a light-transmitting member that is directly or indirectly attached to the display surface and transmits the display light; The light-transmitting member is formed so as to overlap at least a portion of the bezel when viewed from a direction perpendicular to the display surface. Head-up display device.

2. the light-transmitting member includes a light-shielding portion formed on at least one of a back surface of the light-transmitting member facing the bezel and a side surface of the light-transmitting member; The head-up display device according to claim 1 .

3. The light-transmitting member is a light incident surface on which the display light is incident; a light exit surface from which the incident display light exits, The side surface of the light-transmitting member is formed as a rough surface having a surface roughness greater than that of the light incident surface or the light exit surface. The head-up display device according to claim 1 .

4. the head-up display device displays a virtual image by projecting the display light onto a projection member; The light-transmitting member is a light incidence surface on which the display light is incident, which is parallel to the display surface, and which is directly or indirectly attached to the display surface; a light exit surface that is inclined with respect to the light entrance surface, from which the incident display light exits; The inclination angle of the virtual image as seen by the viewer is adjusted by the inclination angle of the light exit surface with respect to the light entrance surface. The head-up display device according to claim 1 .

5. a display panel having a display surface that emits display light; a light-transmitting member that is directly or indirectly attached to the display surface and transmits the display light; the light-transmitting member includes a light-shielding portion formed on at least one of a rear surface of the light-transmitting member facing the display panel and a side surface of the light-transmitting member; Head-up display device.

6. The light-transmitting member is a light incident surface on which the display light is incident; a light exit surface from which the incident display light exits, The side surface of the light-transmitting member is formed as a rough surface having a surface roughness greater than that of the light incident surface or the light exit surface. The head-up display device according to claim 5 .

7. The display device further includes a frame portion that forms a light passing hole through which the display light passes, The light blocking portion is formed at a position where it blocks unwanted light reflected from the outer periphery of the display panel toward the light passing hole. The head-up display device according to claim 5 .

8. the head-up display device displays a virtual image by projecting the display light onto a projection member; The light-transmitting member is a light incidence surface on which the display light is incident, which is parallel to the display surface, and which is directly or indirectly attached to the display surface; a light exit surface that is inclined with respect to the light entrance surface, from which the incident display light exits; The inclination angle of the virtual image as seen by the viewer is adjusted by the inclination angle of the light exit surface with respect to the light entrance surface. The head-up display device according to any one of claims 5 to 7.

Images