Vehicular display device

Abstract

To provide a vehicular display device which can reduce discomfort of display.SOLUTION: The vehicular display device comprises a liquid crystal type display unit which includes a display surface 51 displaying guideline D1 as a picture image D, a back light which illuminates the display unit and a control unit which displays the guideline D1 moving within the display surface 51 through display control of the display unit as the picture image D and controls lighting of the back light and acquires temperature information in accordance with temperature of the display unit. The control unit illuminates a dimming zone, which is formed in a range which contains the guideline D1 and moreover moves by following the guideline D1 when temperature concerning the temperature information is a threshold value or more, at brilliance different from brilliance of a range other than the dimming zone of the display surface 51 and illuminates a dial D2 which is larger than the dimming zone that encompasses the dimming zone and is a range in which the guideline D1 can be moved through lighting control of a plurality of light sources when the temperature concerning temperature information Tm is below the threshold value.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present disclosure relates to a display device for a vehicle. [Background technology]

[0002] The above-mentioned Patent Document 1 discloses a light source device capable of local dimming control. Local dimming control is a technology that individually controls the light emission brightness of multiple light sources to partially change the brightness of the backlight of a liquid crystal display device and increase the contrast of the display screen. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-35908 Summary of the Invention [Problem to be solved by the invention]

[0004] It is known that the configuration described in Patent Document 1 causes a delay in the display response of the liquid crystal display device at low temperatures. For this reason, when a dimming zone (light irradiation range) is moved in accordance with the movement of a partial display of an image in local dimming control, the movement of the display is delayed relative to the movement of the dimming zone, which may cause an unnatural display.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a vehicle display device that can reduce the sense of incongruity in the display. [Means for solving the problem]

[0006] In order to achieve the above object, the vehicle display device according to the present disclosure includes: a liquid crystal display unit having a display surface that displays a pointer as an image; a backlight that illuminates the display unit; a control unit that displays the pointer moving within the display surface as the image through display control of the display unit, controls lighting of the backlight, and acquires temperature information corresponding to the temperature of the display unit; The control unit When the temperature related to the temperature information is equal to or higher than a threshold value, a dimming zone, which is formed in a range including the pointer and moves following the pointer, is illuminated at a brightness different from the brightness of a range of the display surface other than the dimming zone through lighting control of the backlight; When the temperature related to the temperature information is lower than the threshold value, a pointer movable range, which is a range within which the pointer can move, is illuminated by controlling the lighting of the backlight; The threshold value is set to a temperature between a first temperature range in which the display unit operates normally and a second temperature range that is lower than the first temperature range and in which a delay in displaying on the display unit may occur. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to reduce the sense of incongruity in the display. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a block diagram of a vehicle display device according to a first embodiment of the present disclosure. [Figure 2] 1 is a schematic cross-sectional view of a vehicle display device according to a first embodiment of the present disclosure. [Figure 3] FIG. 2 is a front view of an image in a normal temperature mode according to the first embodiment of the present disclosure. [Figure 4] FIG. 10 is a front view of an image in a low temperature mode according to the first embodiment of the present disclosure. [Figure 5] FIG. 10 is a front view of an image according to a second embodiment of the present disclosure. [Figure 6] FIG. 11 is a front view of an image in normal temperature mode according to a third embodiment of the present disclosure. [Figure 7] FIG. 11 is a front view of an image in a low temperature mode according to a third embodiment of the present disclosure. [Figure 8]FIG. 11 is a front view of an image in a low temperature mode according to a fourth embodiment of the present disclosure. [Figure 9] FIG. 11 is a front view of an image in a low temperature mode according to a fourth embodiment of the present disclosure. [Figure 10] FIG. 10 is a front view of an image in a low temperature mode according to a modified example of the present disclosure. [Figure 11] FIG. 10 is a front view of an image according to a modified example of the present disclosure. [Figure 12] FIG. 10 is a diagram showing dimming zones according to a modified example of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) A first embodiment of a vehicle display device according to the present disclosure will be described with reference to the drawings. The vehicle display device uses an indicator to display vehicle information such as vehicle speed or engine revolutions as an image. Display on the display surface.

[0010] As shown in FIG. 1, the vehicle display device 1 includes a control unit 2, a temperature detection unit 3, a backlight 4 having a plurality of light sources 4a, and a display unit 5.

[0011] 2, the display unit 5 is a TFT (Thin Film Transistor) type liquid crystal panel, and displays an image D when illuminated by light from the backlight 4. The display unit 5 has a display surface 51 that displays the image D including vehicle information. The display surface 51 is formed on the front surface of the display unit 5.

[0012] The backlight 4 emits illumination light onto the rear side (opposite the display surface 51) of the display unit 5. The multiple light sources 4a are each made up of an LED (Light Emitting Diode), and are arranged in a matrix in two directions along the display surface 51 that are perpendicular to each other.

[0013] As shown in FIG. 1, the temperature detection unit 3 detects a temperature corresponding to the ambient temperature of the display unit 5, and outputs the detected temperature information Tm to the control unit 2. In this example, the temperature detection unit 3 is configured as a part of the vehicle display device 1, but it may be provided outside the vehicle display device 1 as long as it is capable of detecting a temperature that changes depending on the temperature of the environment in which the display unit 5 is used. For example, the temperature detection unit 3 may be a temperature sensor provided in an air conditioner or the like in the vehicle cabin.

[0014] The control unit 2 includes a central processing unit (CPU), a graphics display controller (GDC), a read-only memory (ROM), and a random access memory (RAM). The control unit 2 receives a video signal SV and vehicle information CI from the outside, and executes control to display an image D on the display surface 51 and control to turn on the backlight 4. The video signal SV is the original data of the image D to be displayed on the display surface 51. The vehicle information CI includes information such as vehicle speed, engine revolutions, etc. The control unit 2 includes an image processing unit 2a that displays an image D on the display surface 51, and an illumination control unit 2b that controls illumination of the backlight 4. The image processing unit 2a generates an image D by setting brightness and color for each pixel on the display surface 51 using RGB values. The lighting control unit 2b can perform local dimming control to control the light emission luminance of each light source 4a in accordance with the image D in units of a plurality of areas (dimming zones).

[0015] 3 and 4, the image D displayed on the display surface 51 includes a pointer D1, a dial D2, and a background D3. The dial D2 is circular and is displayed with a different brightness and color from the pointer D1. In this example, the dial D2 is displayed in a dark color, for example, black, and the pointer D1 is displayed in a light color, for example, white. The colors of the dial D2 and the hands D1 are not limited to those in this example, and for example, the dial D2 may be displayed in a light color and the hands D1 may be displayed in a dark color.

[0016] The pointer D1 is displayed on the dial D2. The base end of the pointer D1 is located approximately in the center of the dial D2, and the pointer D1 is rotatable within the dial D2 around the base end of the pointer D1. The pointer D1 is formed in a rod shape, for example, a rod shape whose width decreases from the base end to the tip. The background D3 is formed over the entire display surface 51 and is displayed as the background of the dial D2 with a brightness and color different from those of the dial D2.

[0017] Within the dial D2, scales and numerical values (neither of which is shown) are displayed along the outer periphery of the dial D2. To display vehicle information (vehicle speed, engine RPM, etc.), the image processing unit 2a rotates the pointer D1 so that the tip of the pointer D1 points to the scales and numerical values. The dimming zones A1 and A2 illuminate the pointer D1 and move in accordance with the movement of the pointer D1. The dimming zones A1 and A2 are illuminated by local dimming control at a brightness higher than the brightness of the range of the display surface 51 other than the dimming zones A1 and A2 (the dial D2 or background D3). The dimming zones A1 and A2 are formed in a shape that includes the pointer D1 around the pointer D1, in this example, a rectangular shape. The pointer D1 is displayed so as to be located approximately in the center of the dimming zones A1 and A2 in the movable direction C of the pointer D1. The dimming zones A1 and A2 are formed to be larger than the pointer D1 by a margin M in the moving direction C of the pointer D1. Due to this margin M, even if the rotation display of the pointer D1 lags behind the movement of the dimming zones A1 and A2 at low temperatures, the pointer D1 is maintained within the dimming zones A1 and A2. Therefore, discomfort in the display, such as flickering of the image D, is suppressed. In the areas of the dial D2 other than the dimming zones A1 and A2, the light sources 4a corresponding to these areas are turned off and the brightness is set to zero. Note that these areas may be illuminated at a predetermined brightness as long as the brightness is lower than that of the dimming zones A1 and A2.

[0018] The dimming zone A2 (see FIG. 4) is used at low temperatures and is formed to be larger in size in the movable direction C of the pointer D1 than the dimming zone A1 (see FIG. 3) used at normal temperatures. Therefore, the margin M of the dimming zone A2 is larger than the margin M of the dimming zone A1.

[0019] The size of each of the dimming zones A1 and A2 in the movable direction C is set to be larger as the contrast ratio of the image D increases. Based on a user operation or external information, the control unit 2 can display an image D selected from a plurality of types of images with different colors and designs on the display surface 51. The size of the movable direction C of each of the dimming zones A1 and A2 is set according to the contrast ratio of the image D for each type.

[0020] The control unit 2 performs pointer control to rotate the pointer D1 on the dial D2 based on vehicle information CI input from the outside, and determines the dimming zones A1, A2 to be used in this pointer control based on whether the temperature related to the temperature information Tm obtained from the temperature detection unit 3 is above the threshold value Th. When the temperature related to the temperature information Tm acquired from the temperature detection unit 3 is equal to or higher than the threshold value Th, the control unit 2 sets the normal temperature mode and illuminates the pointer D1 in the dimming zone A1. On the other hand, when the temperature related to the temperature information Tm acquired from the temperature detection unit 3 is lower than the threshold value Th, the control unit 2 sets the low temperature mode and illuminates the pointer D1 in the dimming zone A2. The threshold value Th is set in advance to a temperature between a low temperature range where the response speed of the display unit 5 may be slow and a normal temperature range where the display unit 5 operates at a normal response speed. The threshold value Th is set, for example, to 0°C to -10°C.

[0021] The rotation of the dimming zones A1 and A2 to follow the pointer D1 is realized by the lighting control unit 2b controlling the lighting position of the light source 4a, and the rotation of the pointer D1 is realized by the image processing unit 2a controlling the display unit 5. Therefore, at low temperatures, the rotation of the pointer D1 lags behind the rotation of the dimming zones A1 and A2, but in the low-temperature mode, the dimming zone A2, which has a large size in the movable direction C, is used, so the pointer D1 is likely to be within the dimming zone A2 even if this delay occurs.

[0022] (effect) According to the first embodiment described above, the following effects are achieved. (1) A vehicle display device 1 includes a liquid crystal display unit 5 having a display surface 51 for displaying an image D, a backlight 4 for illuminating the display unit 5, and a control unit 2 that displays, as the image D, a pointer D1, which is an example of a moving part, that moves within the display surface 51 through display control of the display unit 5, illuminates dimming zones A1 and A2, which are formed in a range including the pointer D1 and move following the pointer D1 through lighting control of the backlight 4, at a brightness different from the brightness of the range of the display surface 51 other than the dimming zones A1 and A2, and acquires temperature information Tm corresponding to the temperature of the display unit 5. The control unit 2 increases the size of the dimming zones A1 and A2 in the movable direction C of the pointer D1 as the temperature related to the temperature information Tm decreases. With this configuration, even if the rotation display of the pointer D1 lags behind the movement of the dimming zones A1 and A2 at low temperatures, the pointer D1 is maintained within the dimming zone A2, thereby reducing the sense of incongruity in the display of the image D.

[0023] (2) The size of the dimming zones A1 and A2 in the movable direction C is set larger as the contrast ratio of the image D increases. If the contrast ratio is large, if the pointer D1 falls outside the dimming zones A1 and A2, the display of the image D will appear strange. With the above configuration, if the contrast ratio is large, the size of the movable direction C of the dimming zones A1 and A2, i.e., the margin M, will be large, making it possible to prevent the pointer D1 from falling outside the dimming zones A1 and A2.

[0024] (Second embodiment) A second embodiment of a vehicle display device according to the present disclosure will be described with reference to the drawings. This embodiment differs from the first embodiment in that dimming zones of different sizes are set for each of a plurality of pointer indicators with different pointer movement speeds. The following description will focus on the differences from the first embodiment.

[0025] 5, the vehicle display device 1a displays two indicators Da and Db as images on a display surface 51. Each of the indicators Da and Db has a pointer D1 and a dial D2. The indicators Da and Db are arranged in the left-right direction as seen by a viewer. The average moving speed of the pointer D1 of the pointer Db is faster than the average moving speed of the pointer D1 of the pointer Da. The pointer Da indicates the vehicle speed, and the pointer Db indicates the engine RPM. The pointer indicating the engine RPM generally moves faster than the pointer indicating the vehicle speed. Taking this into consideration, the dimming zones A1 and A2 of the pointer Db are set to be larger in size in the moving direction C of the pointer D1 than the dimming zones A1 and A2 of the pointer Da.

[0026] (effect) According to the second embodiment described above, the following effects are achieved. (1) The control unit 2 can display, as an image D, the pointer D1 of the pointer meter Da, which is an example of a first moving part, and the pointer D1 of the pointer meter Db, which is an example of a second moving part whose average moving speed is faster than the average moving speed of the pointer D1, and makes the size of the moving direction C of the dimming zones A1 and A2 including the pointer D1 of the pointer meter Db larger than the size of the moving direction C of the dimming zones A1 and A2 including the pointer D1 of the pointer meter Da. According to this configuration, even if the pointer D1 of the pointer indicator Db, which moves at high speed, moves later than the movement of the dimming zone A2 at low temperatures, it is likely to be maintained within the dimming zone A2, and the sense of incongruity in the display of the image D can be reduced.

[0027] (Third embodiment) A third embodiment of a vehicle display device according to the present disclosure will be described with reference to the drawings. This embodiment differs from the first embodiment in that the color of the dial in the low temperature mode is brighter than the color of the dial in the normal temperature mode.

[0028] As shown in Figure 6, in the normal temperature mode, as in the first embodiment described above, the dial D2 is displayed in a dark color such as black, and the pointer D1 is displayed in a lighter color than the dial D2, for example, a light color such as white, and the dimming zone A1 is set within the dial D2 to surround the pointer D1, as in the first embodiment described above.

[0029] As shown in Fig. 7, in the low temperature mode, the dial D2 and hands D1 are displayed in a light color such as white within the outline of their respective frames, and the entire display surface 51, including the dial D2, is illuminated by a backlight at a uniform brightness. The brightness of the color of the dial D2 (the color within the outline of the dial D2) in the low temperature mode is set brighter than the brightness of the color of the dial D2 in the normal temperature mode. The color brightness is expressed as a value V (value) calculated from the RGB values of each pixel of the display unit 5. That is, in the low temperature mode, no dimming zone is set and no local dimming control is performed. In this example, in the low temperature mode, the entire display surface 51 is illuminated with a uniform brightness, but the entire display surface 51 may be illuminated with a uniform brightness, and only the dial D2 may be illuminated with a uniform brightness. In this case, the background D3 is illuminated with a brightness different from that of the dial D2.

[0030] (effect) According to the third embodiment described above, the following effects are achieved. (1) The vehicle display device 1 includes a liquid crystal display unit 5 having a display surface 51 that displays, as an image D, a pointer D1, which is an example of a moving part, and a dial D2, which is an example of a moving part background image behind the pointer D1; a backlight 4 that illuminates the display unit 5; and a control unit 2 that displays the pointer D1 moving within the display surface 51 as the image D through display control of the display unit 5, controls the lighting of the backlight 4, and acquires temperature information Tm corresponding to the temperature of the display unit 5. When the temperature related to the temperature information Tm is equal to or higher than a threshold value Th, the control unit 2 displays the dial D2 in a first color (dark color), while illuminating dimming zones A1 and A2, which are formed in a range including the pointer D1 and move following the pointer D1, at a brightness different from the brightness of the range of the display surface 51 other than the dimming zones A1 and A2. When the temperature related to the temperature information Tm is lower than the threshold value Th, the control unit 2 displays the dial D2 in a second color (light color) that is brighter than the first color. The threshold value Th is set between a first temperature range in which the display unit 5 operates normally and a second temperature range in which the display on the display unit 5 may be delayed. According to this configuration, the dial D2 has a bright color at low temperatures, which reduces the sense of incongruity of the image D displayed. (2) When the temperature related to the temperature information Tm is lower than the threshold value Th, the control unit 2 illuminates the entire dial D2 with the same brightness. According to this configuration, it is not necessary to move the dimming zone A2 in accordance with the pointer D1, and the sense of incongruity in the display of the image D can be reduced.

[0031] (3) When the temperature related to the temperature information Tm is less than the threshold value Th, the control unit 2 displays the entire display surface 51 including the dial D2 in a second color (light color) and illuminates the entire display surface 51 with the same brightness. This configuration can reduce the sense of incongruity felt when displaying image D at low temperatures.

[0032] (Fourth embodiment) A fourth embodiment of a vehicle display device according to the present disclosure will be described with reference to the drawings. This embodiment differs from the first embodiment in that a dimming zone including the movable range of the pointer is set in the low temperature mode. The following description will focus on the differences from the first embodiment.

[0033] As shown in Fig. 8, the dimming zone A3 in the low-temperature mode is set to an area that includes the movable range of the pointer D1. The dimming zone A3 is formed in a rectangular shape. In this example, the dial D2 is displayed in a dark color, as in the first embodiment.

[0034] The dimming zone A3 may be formed in the same area as the dial D2, as shown in Fig. 9, instead of the example in Fig. 8. In this case, when the temperature is low, illumination light is irradiated onto the dial D2, so that the pointer D1 is always within the dimming zone A3. Furthermore, the dimming zone A3 may be rectangular and include the entire area of the dial D2. In addition, in the low temperature mode, local dimming control may not be performed, and the entire display surface 51 may be illuminated with uniform brightness.

[0035] (effect) According to the fourth embodiment described above, the following effects are achieved. (1) A vehicle display device 1 includes a liquid crystal display unit 5 having a display surface 51 that displays a pointer D1 as an image D, a backlight 4 that illuminates the display unit 5, and a control unit 2 that displays the pointer D1 moving within the display surface 51 as the image D through display control of the display unit 5, controls the backlight 4, and acquires temperature information Tm corresponding to the temperature of the display unit 5. When the temperature associated with the temperature information Tm is equal to or higher than a threshold Th, the control unit 2 illuminates a dimming zone A1 that is formed in a range including the pointer D1 and moves following the pointer D1 at a brightness different from the brightness of the range of the display surface 51 other than the dimming zone A3. When the temperature associated with the temperature information Tm is less than the threshold Th, the control unit 2 illuminates a dimming zone A3, an example of a pointer movable range that is larger than the dimming zone A1 that includes the dimming zone A1 and is a range within which the pointer D1 can move, through control of the lighting of multiple light sources 4a. The threshold Th is set between a first temperature range in which the display unit 5 operates normally and a second temperature range in which a delay in display on the display unit 5 may occur. According to this configuration, the pointer movement range is illuminated as the dimming zone A3 at low temperatures, so the pointer D1 does not go outside the dimming zone A2, and the sense of incongruity in the display of the image D can be reduced.

[0036] (2) When the temperature related to the temperature information Tm is lower than the threshold value Th, the control unit 2 illuminates the entire area of the display surface 51 as the pointer movable range with uniform brightness. According to this configuration, when the temperature is low, the local dimming control is stopped and the pointer D1 does not go outside the dimming zone A3, thereby reducing the sense of incongruity in the display of the image D.

[0037] (3) The control unit 2 displays a circular dial D2 as an image D behind the pointer D1. When the temperature related to the temperature information Tm is less than the threshold value Th, the control unit 2 illuminates the entire dial D2, which corresponds to the dimming zone A3 as the pointer movable range, with uniform brightness. According to this configuration, the dial D2 is illuminated with a uniform brightness, which reduces the sense of incongruity felt when the image D is displayed.

[0038] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) may be made as appropriate within the scope of the present disclosure. An example of such a modification is described below.

[0039] (Variation) In each of the above embodiments, each dimming zone A1, A2 may be formed in a sector shape corresponding to the rotation range of the pointer D1, as shown in Fig. 11. In this case, the size of each dimming zone A1, A2 may be set according to the angle of the movable direction C. 12, the pointer D1 may be positioned closer to the moving direction C1 of the pointer D1 than the center position of the moving direction C of the dimming zones A1 and A2. The moving direction C1 is clockwise in the moving direction C when the indication amount of the pointer D1 increases, and is counterclockwise in the moving direction C when the indication amount of the pointer D1 decreases. This makes it easier for the pointer D1 to be maintained within the dimming zone A2 even if the rotation indication of the pointer D1 lags behind the movement of the dimming zone A2 in the direction C2 opposite to the moving direction C1 at low temperatures.

[0040] In the above embodiments, the illumination brightness within the dimming zones A1 and A2 is set uniformly. However, the dimming zones A1 and A2 may have a gradation in which the brightness changes depending on the position within the dimming zones A1 and A2. For example, as shown in FIG. 10, the dimming zones A1 and A2 may have a gradation in which the brightness is maximum at the center of the dimming zones A1 and A2 and decreases with increasing distance from the center. This allows the boundary between the inside and outside of the dimming zones A1 and A2 to be blurred. The brightness distribution in the gradation may change proportionally or according to a certain function. Furthermore, the gradation may be provided only in the movable direction C of the pointer D1 within the dimming zones A1 and A2. Moreover, the gradation may be applied only to the boundary portions between the inside and outside of the dimming zones A1 and A2. In each of the above embodiments, the moving part is the pointer D1, but it may be a display content other than the pointer D1. In this case, the moving part may move linearly.

[0041] In the above embodiments, the sizes of the dimming zones A1, A2, and A3 are changed depending on the temperature, but they may also be changed depending on the degree of movement of the pointer D1 (the acceleration or speed of the pointer D1) in addition to the temperature. For example, the control unit 2 may acquire the degree of movement of the pointer D1 in real time, and set the sizes of the dimming zones A1, A2, and A3 to be larger as the acquired degree of movement increases.

[0042] In the first embodiment, the control unit 2 selects one of two dimming zones A1 and A2 of different sizes depending on whether the temperature related to the temperature information Tm acquired from the temperature detection unit 3 is equal to or greater than the threshold value Th. However, it may be possible to set three or more dimming zones of different sizes. For example, the control unit 2 may determine the size of the dimming zone based on the temperature related to the acquired temperature information Tm using a data table or a calculation formula. This allows the size of the dimming zone to be gradually changed in accordance with changes in temperature.

[0043] In the first embodiment, as shown in FIG. 4, the dimming zone A2 is sized so that a part of the dimming zone A2 is outside the dial D2, but the dimming zone A2 may be sized so that it is inside the dial D2. In the above embodiments, in the normal temperature mode, the dial D2 is displayed darker than the pointer D1, but this is not limiting, and the dial D2 may be displayed brighter than the pointer D1. In this case, the brightness in the dimming zone A1 is set lower than the brightness of the area of the display surface 51 other than the dimming zone A1. In each of the above embodiments, the size of the dimming zones A1 and A2 in the movable direction C is set to be larger as the contrast ratio of the image D increases, but this size may also be set to be the same regardless of the contrast ratio. The vehicle display device 1 in each of the above embodiments may be applied to a head-up display device that projects a virtual image onto a windshield or a combiner.

[0044] In the third embodiment, in the low temperature mode, the color of the dial D2 or the entire display surface 51 may be displayed gradually brighter as the temperature related to the acquired temperature information Tm decreases, and in the normal temperature mode, the color of the dial D2 may be displayed gradually brighter as the temperature related to the acquired temperature information Tm decreases. This prevents a large change in the brightness of the image D even when the mode transitions between the low temperature mode and the normal temperature mode. In each of the above embodiments, in the low temperature mode, the size of the dimming zone may be gradually reduced as the temperature related to the acquired temperature information Tm increases. Also, in the normal temperature mode, the size of the dimming zone may be gradually increased as the temperature related to the acquired temperature information Tm decreases. This makes it possible to suppress abrupt changes in the size of the dimming zone. [Explanation of symbols]

[0045] 1,1a Vehicle display device 2. Control Unit 2a Image processing unit 2b Lighting control section 3 Temperature detection unit 4 Backlight 4a light source 5 Display section 51 Display surface A1, A2, A3 dimming zone C Moving direction C1 Direction of travel C2 Opposite direction D Image D1 guideline D2 dial D3 Background M margin CI Vehicle Information Da,Db pointer meter SV video signal Th threshold Tm temperature information

Claims

1. a liquid crystal display unit having a display surface that displays a pointer as an image; a backlight that illuminates the display unit; a control unit that displays the pointer moving within the display surface as the image through display control of the display unit, controls lighting of the backlight, and acquires temperature information corresponding to the temperature of the display unit; The control unit When the temperature related to the temperature information is equal to or higher than a threshold value, a dimming zone, which is formed in a range including the pointer and moves following the pointer, is illuminated at a brightness different from the brightness of a range of the display surface other than the dimming zone through lighting control of the backlight; When the temperature related to the temperature information is lower than the threshold value, a pointer movable range, which is a range within which the pointer can move, is illuminated by controlling the lighting of the backlight; The threshold value is set to a temperature between a first temperature range in which the display unit operates normally and a second temperature range that is lower than the first temperature range and in which a delay in displaying on the display unit may occur. Vehicle display device.

2. When the temperature related to the temperature information is lower than the threshold value, the control unit controls the lighting of the backlight to illuminate the entire area of the display surface as the pointer movable range with uniform brightness. The vehicle display device according to claim 1 .

3. the control unit displays a circular dial as the image behind the pointer, and when the temperature related to the temperature information is lower than the threshold, illuminates the entire dial as the pointer movable range with uniform brightness through lighting control of the backlight. The vehicle display device according to claim 1 .

Images