On-vehicle display device

Abstract

To provide an on-vehicle display device capable of ensuring an excellent display in a portion of a cover panel and uniformity between the cover panel and its surrounding members.SOLUTION: An on-vehicle display device 10 comprises a cover panel 2, a display section, and a light transmittance adjustment plate 9. The cover panel 2 constitutes part of a vehicle dashboard and has light transmittance. The display section is a first display section 1 or a second display section 8 that emits light toward the cover panel 2 to perform a predetermined display through the light transmitted through the cover panel 2. The light transmittance adjustment plate 9 is provided between the cover panel 2 and the display section, and its light transmittance is adjusted through electrical control. The light transmittance adjustment plate 9 is adjusted to a first light transmittance in a display state in which the display section performs the predetermined display, and adjusted to a second light transmittance lower than the first light transmittance in a non-display state in which the display section does not perform the predetermined display.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an in-vehicle display device. [Background technology]

[0002] For example, Patent Document 1 describes an in-vehicle display device in which the front of a display unit (display) that displays images is covered with a light-transmitting cover panel (screen), and the surface of the cover panel is set to the same wood-grain color and pattern as the mounting portion around the display unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-331132 Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of display device, the light transmittance of the cover panel needs to be set to a level that allows the image on the display unit to be clearly visible through the cover panel. However, simply increasing the light transmittance of the cover panel may result in the cover panel appearing to stand out from its surrounding components when the display unit is turned off (not emitting light), which could make it difficult to ensure uniformity between the cover panel and its surrounding components.

[0005] The present disclosure has been made in consideration of the above-mentioned situation, and aims to provide an in-vehicle display device that can ensure good display in the cover panel area and uniformity of the cover panel and its surrounding components. [Means for solving the problem]

[0006] In order to achieve the above object, the in-vehicle display device according to the present disclosure comprises: a cover panel that constitutes a part of a dashboard of a vehicle and has optical transparency; a display unit that emits light toward the cover panel and performs a predetermined display using the light that has passed through the cover panel; a light transmittance adjusting plate provided between the cover panel and the display unit, the light transmittance of which is adjusted by electrical control; The light transmittance adjusting plate is In a display state in which the display unit is performing the predetermined display, the light transmittance is adjusted to a first light transmittance, In a non-display state in which the display unit is not performing the predetermined display, the light transmittance is adjusted to a second light transmittance lower than the first light transmittance. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to ensure good display at the cover panel portion and uniformity of the cover panel and its surrounding members. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing a vehicle interior equipped with an in-vehicle display device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1 according to the embodiment. [Figure 3] 5 is a timing chart showing control transitions of the first display unit and the light transmittance adjusting plate according to the embodiment; [Figure 4] 6 is a timing chart showing control transitions of the second display unit and the light transmittance adjusting plate according to the embodiment; [Figure 5] FIG. 10 is a schematic cross-sectional view of an in-vehicle display device according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present disclosure will be described with reference to the drawings.

[0010] 1, the in-vehicle display device 10 is mounted on a dashboard 13 of a vehicle and displays various information to a user who is a passenger (mainly the driver) of the vehicle. In the following description, an upward direction Ud, a downward direction Dd, a leftward direction Ld, and a rightward direction Rd are defined based on the viewpoint of the user of the in-vehicle display device 10, a forward direction Fd is defined as the direction toward the user, and a backward direction Bd is defined as the direction toward the user.

[0011] The in-vehicle display device 10 includes a first display area 11 and a second display area 12. The first display area 11 is an area where a display is performed by a first display unit 1, which will be described later. The second display area 12 is an area where a display is performed by a second display unit 8, which will be described later. The first display area 11 is rectangular. The second display area 12 is, for example, circular and has a smaller area than the first display area 11, and is located adjacent to the first display area 11 in the vehicle width direction (more precisely, in the left direction Ld as seen from the user). The first display area 11 and the second display area 12 are disposed on the dashboard 13 between the driver's seat and the passenger seat. In each of the first display area 11 and the second display area 12, a predetermined display is performed by light transmitted through a cover panel 2 having a pattern, such as wood grain, and a color corresponding to the pattern.

[0012] As shown in FIG. 2, the in-vehicle display device 10 includes a first display unit 1, a cover panel 2, a second display unit 8, a light transmittance adjustment plate 9, an outer case 3, an inner case 31, a circuit board 4, and a control unit 6.

[0013] The first display unit 1 includes a display panel 1a and a backlight 1b.

[0014] The display panel 1a is, for example, a TFT (Thin Film Transistor) liquid crystal panel and has a rectangular plate shape that is long in the left-right directions Ld and Rd. The display panel 1a is electrically connected to a circuit board 4 and displays images under the control of a control unit 6 mounted on the circuit board 4.

[0015] A light-transmitting layer 7 made of a hardened optical bonding agent is positioned between the front surface of the display panel 1a and the rear surface of a light transmittance adjusting plate 9, which will be described later.

[0016] The backlight 1b illuminates the display panel 1a, which is a liquid crystal panel, from behind. The backlight 1b includes components (not shown) such as a plurality of light sources made up of LEDs (Light Emitting Diodes) and a light diffusion plate positioned between the plurality of light sources and the display panel 1a. The backlight 1b emits light when the plurality of light sources are driven under the control of the control unit 6.

[0017] The cover panel 2 is light-transmitting and covers the first display unit 1 and the second display unit 8. Note that the cover panel 2 being light-transmitting does not necessarily mean that the entire area of ​​the cover panel 2 is light-transmitting, but rather that at least a portion of the cover panel 2 is light-transmitting and can transmit light emitted by each of the first display unit 1 and the second display unit 8. The cover panel 2 forms part of the dashboard 13 of the vehicle (see FIG. 1 ) and is formed with a color and pattern. Furthermore, the cover panel 2 may be formed with an uneven shape similar to the texture of the dashboard 13.

[0018] The cover panel 2 is formed so as to cover the opening of the outer case 3 in the forward direction Fd, and is formed as a plate member that is long in the left-right directions Ld and Rd and exposed on the front side of the dashboard 13. The cover panel 2 may be formed in a flat plate shape, or in a curved plate shape that matches the shape of the dashboard 13. When the cover panel 2 is formed in a curved plate shape, it may be curved so as to bulge in the forward direction Fd toward the user in the up-down directions Ud and Dd.

[0019] The cover panel 2 includes a light-transmitting base material 21, a light-shielding layer 22, and a light-transmitting design layer 23. The light-transmitting design layer 23 is laminated on the front surface of the light-transmitting base material 21, and the light-shielding layer 22 is laminated on the rear surface of the light-transmitting base material 21.

[0020] The light-transmitting substrate 21 is a plate-like member made of a light-transmitting material such as acrylic resin (PMMA: Poly Methyl Methacrylate) or soda lime glass. The light transmittance of the light-transmitting substrate 21 can be set arbitrarily depending on the purpose.

[0021] The light-shielding layer 22 is formed so as to hide the internal structure of the in-vehicle display device 10 from the user. The light-shielding layer 22 is an ink layer formed by printing, for example, black ink, and is provided except for positions corresponding to the first display unit 1 and the second display unit 8. In other words, in this case, the light-shielding layer 22 is not formed on the rear surface of the light-transmitting base material 21 in a portion corresponding to the first display area 11, and on a portion of the second display area 12 that transmits light from the second display unit 8. The light-shielding layer 22 is provided between the light-transmitting base material 21 and the first display unit 1 (light transmittance adjusting plate 9).

[0022] The light-transmitting design layer 23 is a light-transmitting layer having a light-transmitting wood grain, metal, fabric, or leather pattern and a color corresponding to the pattern. The pattern and color are formed by applying light-transmitting printing, which is printing that allows light to pass through, to the front surface of the light-transmitting base material 21. The light-transmitting design layer 23 may also be formed on the rear surface of the light-transmitting base material 21. In this case, the light-shielding layer 22 may be formed on the rear surface of the light-transmitting design layer 23. The light-transmitting design layer 23 may also be formed on both the front and rear surfaces of the light-transmitting base material 21.

[0023] A light-transmitting layer 5 made of a hardened optical bonding agent is positioned between the rear surface of the cover panel 2 and the front surface of a light transmittance adjusting plate 9, which will be described later.

[0024] The first display unit 1 emits light (display light showing an image) toward the cover panel 2, and the light that passes through the cover panel 2 performs a predetermined display in the first display area 11.

[0025] The second display unit 8 has a light source 8a for indicators and a light box 8b that guides light emitted by the light source 8a to the cover panel 2. The light source 8a is made up of an LED (Light Emitting Diode), and its operation is controlled by the control unit 6. The light box 8b is configured as, for example, a part of the inner case 31 described below, but may also be separate from the inner case 31.

[0026] The cover panel 2 has an indicator formed by combining portions with different light transmittances in the second display area 12. In this embodiment, the indicator is formed by combining portions in the second display area 12 of the cover panel 2 that transmit light emitted from the light source 8a and portions on which the light-shielding layer 22 is formed (i.e., portions with a light transmittance of 0 (zero)). This example is not limiting, and the indicator may be formed by combining multiple portions on the cover panel 2 that have a light transmittance greater than 0 (zero). Furthermore, the indicator, as its name suggests, may have any shape depending on the purpose, such as an icon that indicates some information to the user.

[0027] The second display unit 8 emits light from the light source 8a toward the cover panel 2, thereby causing the second display area 12 to emit light to display an indicator.

[0028] When the first display unit 1 does not emit display light that displays an image, the pattern of the light-transmitting design layer 23 is mainly visible in the first display area 11 due to external light (for example, sunlight or light from an outdoor lamp). On the other hand, when the first display unit 1 emits display light, an image is displayed in the first display area 11 so as to be visible through the pattern of the light-transmitting design layer 23. Furthermore, when light is not emitted from the light source 8a of the second display unit 8, the pattern of the light-transmitting design layer 23 is mainly visible in the second display area 12 due to external light. On the other hand, when light is emitted from the light source 8a, an indicator is displayed in the second display area 12 so as to be visible through the pattern of the light-transmitting design layer 23.

[0029] The circuit board 4 is a PCB (Printed Circuit Board) and is located behind the first display unit 1. A control unit 6 that controls the overall operation of the in-vehicle display device 10, a light source 8a that constitutes the second display unit 8, and other electronic components are mounted on the circuit board 4. The control unit 6 may be disposed in any position as long as it is electrically connected to the circuit board 4.

[0030] The light transmittance adjustment plate 9 is provided between the cover panel 2 and the first and second display units 1 and 8, and is configured so that its light transmittance is adjusted by electrical control by the control unit 6. The light transmittance adjustment plate 9 has a known configuration, and is configured in the form of a sheet, for example, with liquid crystal molecules sealed between a pair of PET (polyethylene terephthalate) films on which transparent electrodes are arranged. How the light transmittance adjustment plate 9 is controlled will be described later.

[0031] For example, the light transmittance of the light transmittance adjusting plate 9 is independently controlled for the portion corresponding to the first display area 11 and the portion corresponding to the second display area 12. Note that the portion corresponding to the first display area 11 and the portion corresponding to the second display area 12 of the light transmittance adjusting plate 9 may be physically separated.

[0032] The outer case 3 is made of light-blocking resin or metal and is formed in a box shape that is open in the forward direction Fd. The outer case 3 houses the first display unit 1, the second display unit 8, the circuit board 4, and the inner case 31. The inner case 31 is made of light-blocking resin or metal and houses the first display unit 1 and the light source 8a for the indicators. The inner case 31 is installed between the front surface of the circuit board 4 and the rear surface of the cover panel 2.

[0033] The control unit 6 includes a function control unit that controls the overall operation of the in-vehicle display device 10 and a display control unit that controls the display of the display unit 1. For example, the function control unit is configured with a microcontroller including a CPU (Central Processing Unit) and controls the operation of the light source of the backlight 1b, the indicator light source 8a, and the light transmittance adjustment plate 9. The function control unit also communicates with various electronic components such as the vehicle's ECU (Electronic Control Unit) via a CAN (Controller Area Network) to monitor various vehicle conditions. For example, the display control unit is configured with a GPU (Graphics Processing Unit) and generates an image to be displayed on the display panel 1a based on a control signal from the function control unit and image data for drawing stored in a memory (not shown), and outputs a drive signal to the display panel 1a. The display control unit and the function control unit may be implemented as functions of a control device configured with one or more IC (Integrated Circuit) chips, and their configurations may be arbitrary.

[0034] (Control transition of the first display unit 1 and the light transmittance adjusting plate 9) Next, the control transition of the first display section 1 and the light transmittance adjusting plate 9 will be described with reference to FIG.

[0035] In the following, a state in which the display panel 1a displays an image may be expressed as the display panel 1a being ON, and a state in which the display panel 1a does not display an image may be expressed as the display panel 1a being OFF. Also, a state in which the backlight 1b (specifically, the light source of the backlight 1b) is emitting light may be expressed as the backlight 1b being ON, and a state in which the backlight 1b is not emitting light may be expressed as the backlight 1b being OFF.

[0036] The light transmittance adjusting plate 9 is adjusted to a first light transmittance T1 in a display state Ss where the first display unit 1 is performing a predetermined display (i.e., both the display panel 1a and the backlight 1b are ON). On the other hand, the light transmittance adjusting plate 9 is adjusted to a second light transmittance T2 lower than the first light transmittance T1 in a non-display state Sh where the first display unit 1 is not performing a predetermined display (i.e., both the display panel 1a and the backlight 1b are OFF). As a result, in the display state Ss, the amount of display light that passes from the first display unit 1 through the cover panel 2 can be ensured, and good display can be achieved in the cover panel 2 portion (i.e., the first display area 11). Also, in the non-display state Sh, the light transmittance of the cover panel 2 portion (i.e., the second display area 12) can be reduced, ensuring uniformity between the cover panel 2 and its surrounding components (i.e., the dashboard 13 that is configured integrally with the cover panel 2).

[0037] Here, in a display preparation state S1 before switching from the non-display state Sh to the display state Ss, the control unit 6 changes the light transmittance adjusting plate 9 from the second light transmittance T2 to the first light transmittance T1, and then causes the first display unit 1 to emit light. Specifically, in the display preparation state S1, the control unit 6 changes the light transmittance adjusting plate 9 from the second light transmittance T2 to the first light transmittance T1, then causes the liquid crystal panel 1a to display an image, and then causes the backlight 1b to emit light (that is, turns on the liquid crystal panel 1a, and then turns on the backlight 1b). This control transition prevents an unclear image from being displayed in the first display area 11 during the transition from the non-display state Sh to the display state Ss, and also enables a clear image to be displayed in the display state Ss.

[0038] On the other hand, in a non-display preparation state S2 before switching from the display state Ss to the non-display state Sh, the control unit 6 stops the light emission of the first display unit 1, and then changes the light transmittance adjustment plate 9 from the first light transmittance T1 to the second light transmittance T2. Specifically, in the non-display preparation state S2, the control unit 6 stops the light emission of the backlight 1b, and then hides the image that was displayed on the liquid crystal panel 1a (i.e., turns off the backlight 1b, and then turns off the liquid crystal panel 1a), and then changes the light transmittance adjustment plate 9 from the first light transmittance T1 to the second light transmittance T2. This control transition prevents an unclear image from being displayed in the first display area 11 during the transition from the display state Ss to the non-display state Sh, and also ensures consistency between the cover panel 2 and its surrounding components (i.e., the dashboard 13 that is integrally formed with the cover panel 2) in the non-display state Sh.

[0039] (Control transition of second display unit 8 and light transmittance adjusting plate 9) Next, the control transition of the second display section 8 and the light transmittance adjusting plate 9 will be described with reference to FIG.

[0040] In the following, the state in which the second display unit 8 is emitting light (i.e., the state in which the light source 8a is emitting light) may be expressed as the second display unit 8 being ON, and the state in which the second display unit 8 is not emitting light (i.e., the state in which the light source 8a is not emitting light) may be expressed as the second display unit 8 being OFF.

[0041] The light transmittance adjusting plate 9 is adjusted to a first light transmittance T1 in a display state Ss in which the second display unit 8 is performing a predetermined display (i.e., a state in which the second display unit 8 is ON and an indicator is emitting light in the second display area 12). On the other hand, the light transmittance adjusting plate 9 is adjusted to a second light transmittance T2 lower than the first light transmittance T1 in a non-display state Sh in which the second display unit 8 is not performing a predetermined display (i.e., a state in which the second display unit 8 is OFF and an indicator is not emitting light in the second display area 12). As a result, in the display state Ss, the amount of light that passes through the cover panel 2 from the second display unit 8 can be ensured, and good display can be achieved in the cover panel 2 portion (i.e., the second display area 12). Also, in the non-display state Sh, the light transmittance of the cover panel 2 portion (i.e., the second display area 12) can be reduced, thereby ensuring uniformity between the cover panel 2 and its surrounding components (i.e., the dashboard 13 that is configured integrally with the cover panel 2).

[0042] Here, in the display preparation state S1 before switching from the non-display state Sh to the display state Ss, the control unit 6 changes the light transmittance adjustment plate 9 from the second light transmittance T2 to the first light transmittance T1, and then causes the second display unit 8 to emit light. This control transition prevents the second display area 12 from displaying an unclear indicator during the transition from the non-display state Sh to the display state Ss, and enables the second display area 12 to display a clear indicator in the display state Ss.

[0043] On the other hand, in the non-display preparation state S2 before switching from the display state Ss to the non-display state Sh, the control unit 6 stops the light emission of the second display unit 8 and then changes the light transmittance adjustment plate 9 from the first light transmittance T1 to the second light transmittance T2. This control transition prevents the second display area 12 from displaying an unclear indicator during the transition from the display state Ss to the non-display state Sh, and also ensures consistency between the cover panel 2 and its surrounding components (i.e., the dashboard 13 that is integrally formed with the cover panel 2) in the non-display state Sh.

[0044] The present invention is not limited to the above-described embodiments and drawings, and modifications (including the omission of components) can be made as appropriate within the scope of the present invention.

[0045] (Variation) The display panel 1a constituting the first display unit 1 may be an organic EL (Electro-Luminescence) panel, in which case the backlight 1b is not required as a component of the first display unit 1. Furthermore, the display panel 1a is not limited to being a liquid crystal panel or an organic EL panel, and a touch panel may be provided between the display panel 1a and the cover panel 2. Furthermore, the cover panel 2 may have an uneven shape by applying a graining process, a hairline process, or the like to the surface of the light-transmitting design layer 23. The light-transmitting design layer 23 may be made of real wood, metal, fabric, leather, or the like, formed thin enough to transmit light.

[0046] 5 shows another modified example. In this modified example, the cover panel 2 is composed of a light-transmitting base material 21, a light-shielding layer 22, a light-transmitting design layer 23, a light-transmitting layer 5, and a light-transmittance adjusting plate 9, with the light-transmitting layer 5 being located between the rear surface of the light-transmittance base material 21 and the front surface of the light-transmittance adjusting plate 9, and the light-shielding layer 22 being provided on the rear surface of the light-transmittance adjusting plate 9.

[0047] A light-transmitting layer 7 is located between the front surface of the display panel 1a and the rear surface of the light transmittance adjusting plate 9 so as to cover the area where the light-shielding layer 22 is not formed. In another modified example, the light-shielding layer 22 is provided between the light transmittance adjusting plate 9 (light-transmitting substrate 21) and the first display unit 1 (second display unit 8). With this configuration, the light-shielding layer 22 and the first display unit 1 are located on the rear side of the light transmittance adjusting plate 9, so that when the display panel 1a is not displayed and the backlight 1b is turned off, the boundary between the first display area 11 and the light-shielding layer 22 is less visible to the user, which has the advantage of improving display quality.

[0048] The in-vehicle display device 10 described above includes the following configurations. The display units described in (Supplementary Note 1) to (Supplementary Note 3) and (Supplementary Note 6) may be either the first display unit 1 or the second display unit 8. The display unit described in (Supplementary Note 4) corresponds to the first display unit 1. The display unit described in (Supplementary Note 5) corresponds to the second display unit 8.

[0049] (Addendum) (Appendix 1) a cover panel that constitutes a part of a dashboard of a vehicle and has optical transparency; a display unit that emits light toward the cover panel and performs a predetermined display using the light that has passed through the cover panel; a light transmittance adjusting plate provided between the cover panel and the display unit, the light transmittance of which is adjusted by electrical control; The light transmittance adjusting plate is In a display state in which the display unit is performing the predetermined display, the light transmittance is adjusted to a first light transmittance, In a non-display state in which the display unit is not performing the predetermined display, the light transmittance is adjusted to a second light transmittance lower than the first light transmittance. In-vehicle display device.

[0050] (Appendix 2) a control unit that controls operations of the display unit and the light transmittance adjusting plate, The control unit In a display preparation state before switching from the non-display state to the display state, the light transmittance adjusting plate is changed from the second light transmittance to the first light transmittance, and then the display unit is caused to emit light. 10. The in-vehicle display device according to claim 1.

[0051] (Appendix 3) The control unit In a non-display preparation state until the display state is switched to the non-display state, after the light emission of the display unit is stopped, the light transmittance of the light transmittance adjustment plate is changed from the first light transmittance to the second light transmittance. 3. The in-vehicle display device according to claim 2.

[0052] (Appendix 4) the display unit includes a liquid crystal panel that displays an image and a backlight that illuminates the liquid crystal panel from behind; The control unit In the display preparation state, after the light transmittance adjusting plate is changed from the second light transmittance to the first light transmittance, an image is displayed on the liquid crystal panel, and then the backlight is turned on; In the non-display preparation state, after the backlight stops emitting light, the image displayed on the liquid crystal panel is made non-display, and then the light transmittance adjustment plate is changed from the first light transmittance to the second light transmittance. 4. The in-vehicle display device according to claim 3.

[0053] (Appendix 5) the cover panel has an indicator formed by a combination of portions with different light transmittances; The display unit includes a light source for the indicator, and emits light from the light source toward the cover panel to illuminate the indicator. 4. The in-vehicle display device according to claim 3.

[0054] (Appendix 6) the cover panel includes a light-transmitting substrate and a light-shielding layer provided except for a position corresponding to the display unit; The light-shielding layer is provided between the light-transmitting substrate and the display unit. 6. The in-vehicle display device according to claim 1, wherein the display device is a display device for displaying a vehicle-mounted display.

[0055] In the above description, in order to facilitate understanding of the present disclosure, descriptions of well-known technical matters have been omitted as appropriate.

[0056] This invention allows various embodiments and modifications without departing from the broad spirit and scope of this invention. Furthermore, the above-described embodiments are intended to explain this invention and do not limit the scope of this invention. That is, the scope of this invention is defined by the claims, not the embodiments. Various modifications made within the scope of the claims and the meaning of the invention equivalent thereto are considered to be within the scope of this invention. [Explanation of symbols]

[0057] 10…In-vehicle display device 11...First display area, 12...Second display area, 13...Dashboard 1...display unit, 1a...display panel, 1b...backlight 2...cover panel, 21...light-transmitting base material, 22...light-shielding layer, 23...light-transmitting design layer 3...outer case, 31...inner case 4...Circuit board 5,7...Transparent layer 6...Control section 8...second display unit, 8a...light source, 8b...light box 9...Light transmittance adjustment plate Sh...non-display state, Ss...display state S1: Display preparation state, S2: Non-display preparation state

Claims

1. a cover panel that constitutes a part of a dashboard of a vehicle and has optical transparency; a display unit that emits light toward the cover panel and performs a predetermined display using the light that has passed through the cover panel; a light transmittance adjusting plate provided between the cover panel and the display unit, the light transmittance of which is adjusted by electrical control; The light transmittance adjusting plate is In a display state in which the display unit is performing the predetermined display, the light transmittance is adjusted to a first light transmittance, In a non-display state in which the display unit is not performing the predetermined display, the light transmittance is adjusted to a second light transmittance lower than the first light transmittance. In-vehicle display device.

2. a control unit that controls operations of the display unit and the light transmittance adjusting plate, The control unit In a display preparation state before switching from the non-display state to the display state, the light transmittance adjusting plate is changed from the second light transmittance to the first light transmittance, and then the display unit is caused to emit light. The in-vehicle display device according to claim 1 .

3. The control unit In a non-display preparation state until the display state is switched to the non-display state, after the light emission of the display unit is stopped, the light transmittance adjustment plate is changed from the first light transmittance to the second light transmittance. The in-vehicle display device according to claim 2 .

4. the display unit includes a liquid crystal panel that displays an image and a backlight that illuminates the liquid crystal panel from behind; The control unit In the display preparation state, after the light transmittance adjusting plate is changed from the second light transmittance to the first light transmittance, an image is displayed on the liquid crystal panel, and then the backlight is turned on. In the non-display preparation state, after the backlight stops emitting light, the image displayed on the liquid crystal panel is made non-display, and then the light transmittance adjustment plate is changed from the first light transmittance to the second light transmittance. The in-vehicle display device according to claim 3 .

5. the cover panel has an indicator formed by a combination of portions with different light transmittances; The display unit includes a light source for the indicator, and emits light from the light source toward the cover panel to illuminate the indicator. The in-vehicle display device according to claim 3 .

6. the cover panel includes a light-transmitting substrate and a light-shielding layer provided except for a position corresponding to the display unit; The light-shielding layer is provided between the light-transmitting substrate and the display unit. The in-vehicle display device according to claim 1 .

Images