JP2011240868A - Information display device and information display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information display device capable of presenting surrounding circumstances around a vehicle by a less-expensive configuration.SOLUTION: There is provided a display device 11 arranged at a circumstance field of sight spaced apart from a central field of sight of a driver to display information applied to the driver, wherein the display device 11 comprises a plurality of LEDs 32a to 32i arranged in accordance with a predetermined positional relation, and a dispersing plate 33 placed among the plurality of LEDs 32a to 32i and the driver to face in a radiating direction of radiation light of each of the LEDs 32a to 32i and operated to disperse radiation light of each of LEDs 32a to 32i to reduce a brightness of each of LEDs 32a to 32i.

Description

  The present invention relates to an information display device and an information display method for presenting information to a driver of a vehicle.

  Conventionally, what is described in the following patent document 1 is known as a display apparatus for vehicles which displays the surrounding condition of a vehicle. In this vehicular display device, a display screen of a liquid crystal display is installed in a region around the visual field that is distant from the central visual field. This vehicle display device displays information indicating a relative positional relationship with another vehicle that travels in substantially the same traveling direction as that of the host vehicle on the display screen in substantially the same vector as the traveling direction of the host vehicle.

JP 2008-94292 A

  However, since the above-described vehicle display device uses a liquid crystal display as the display device, there is a problem that the cost of the device that displays the surrounding conditions of the vehicle is high.

  Therefore, the present invention has been proposed in view of the above-described circumstances, and an object thereof is to provide an information display device and an information display method capable of presenting the surrounding situation of a vehicle with an inexpensive configuration.

  The present invention provides a display means having a plurality of point light sources arranged according to a predetermined positional relationship and a diffusion plate for diffusing the radiated light of each point light source to reduce the luminance of each point light source. Information provided to the driver is displayed in a peripheral visual field that is distant from the visual field.

  According to the present invention, the radiated light of each point light source is diffused and information is displayed in the peripheral visual field that is distant from the central visual field. Therefore, it is possible to present the surrounding situation of the vehicle with an inexpensive configuration.

It is a figure which shows arrangement | positioning of the display area within the vehicle in the information display system which concerns on 1st Embodiment to which this invention is applied. It is a block diagram which shows the functional structure of the information display system which concerns on 1st Embodiment to which this invention is applied. It is a figure which shows the display apparatus of the information display system which concerns on 1st Embodiment to which this invention is applied, (a) is a side view, (b) is a display example. In the information display system which concerns on 1st Embodiment to which this invention is applied, it is a figure which shows the brightness | luminance with respect to the position of a display apparatus. In the information display system which concerns on 1st Embodiment to which this invention is applied, it is a figure which shows the display form of a display apparatus, (a) is an instantaneous fuel consumption value more than the upper limit of a display range, (b) is an instantaneous fuel consumption value. FIG. 4 is a diagram when is below the lower limit of the display range. In the information display system which concerns on 1st Embodiment to which this invention is applied, it is a figure which shows the other display form of a display apparatus, (a) is an instantaneous fuel consumption value more than the upper limit of a display range, (b) is an instantaneous It is a figure when a fuel consumption value is below the lower limit of a display range. In the information display system which concerns on 1st Embodiment to which this invention is applied, it is a figure which shows the display form of a display apparatus, (a) is an instantaneous fuel consumption value more than the upper limit of a display range, (b) is an instantaneous fuel consumption value. FIG. 4 is a diagram when is below the lower limit of the display range. In the information display system which concerns on 1st Embodiment to which this invention is applied, it is a figure which shows the relationship between the arrangement length of a display apparatus, and a brightness | luminance, As shown to (a), from the Gaussian distribution which changes brightness | luminance, (b) It is explanatory drawing of changing the form of a display pattern to ideal brightness distribution other than the Gaussian distribution which changes brightness | luminance in this way. It is a figure which shows the change of the contrast sensitivity with respect to the spatial frequency in a driver | operator's upward visual field periphery part, Comprising: (a) is a time frequency 0.57Hz, (b) is a time frequency 2.28Hz, (c) is. The case where a time frequency is 9.12 Hz is shown. It is a figure explaining the principle of the peripheral vision display device to which the present invention is applied, and shows the change in contrast sensitivity with respect to the spatial frequency in the peripheral part of the visual field of the driver in the left-right direction. 0.57 Hz, (b) shows the case where the time frequency is 2.28 Hz, and (c) shows the case where the time frequency is 9.12 Hz. It is a figure explaining the principle of the information display system which concerns on 1st Embodiment to which this invention is applied, Comprising: It is a figure which shows the change of the contrast sensitivity with respect to the spatial frequency in a driver | operator's downward visual field periphery part, (a ) Shows the case where the time frequency is 0.57 Hz, (b) shows the time frequency is 2.28 Hz, and (c) shows the case where the time frequency is 9.12 Hz. It is a figure which shows the parameter used in order to obtain | require the change of the contrast sensitivity with respect to a spatial frequency with a calculation formula. It is a figure for demonstrating the visual field range which has contrast sensitivity with respect to a specific spatial frequency, (a) is a time frequency of 0.57 Hz, (b) is a time frequency of 2.28 Hz, (c) is a time frequency. The case where it is 9.12 Hz is shown. It is a figure which shows the eccentric angle with respect to a time frequency for every spatial frequency. It is a figure which shows the positional relationship of the own vehicle and other vehicle which are shown in the information display system which concerns on 2nd Embodiment to which this invention is applied. In the information display system which concerns on 2nd Embodiment to which this invention is applied, it is a figure which shows the relationship between a display apparatus and the positional relationship of another vehicle. It is a block diagram which shows the functional structure in the information display system which concerns on 2nd Embodiment to which this invention is applied. It is a top view which shows the structure of the display apparatus in the information display system which concerns on 3rd Embodiment to which this invention is applied. It is a figure which shows the luminance distribution in the angle direction of a display apparatus in the information display system which concerns on 3rd Embodiment to which this invention is applied. It is a figure which shows the luminance distribution in the radiation direction of a display apparatus in the information display system which concerns on 3rd Embodiment to which this invention is applied.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
The information display system shown as the first embodiment of the present invention presents, for example, the current traveling state of the vehicle to the driver of the vehicle. This information display system presents information in a display pattern in which the luminance does not change abruptly in terms of time and space within the field of view of the driver of the vehicle. In other words, the information display system visually recognizes information having no edge in time and space in a predetermined visual field range within the driver's visual field. Information to be transmitted to the driver using this information display system includes the instantaneous fuel consumption value, the distance and direction of the other vehicle, the vehicle speed, etc. required for the driver to drive the vehicle. including.

  For example, as shown in FIG. 1, the information display system displays information within a range visually recognized by the driver, such as the windshield 1 and the instrument panel 2, the meter display unit 3, and the steering wheel 4 of the host vehicle. The information display system sets a display area around the driver's gaze direction within a visible range and visible by the peripheral visual field when driving the vehicle.

  The information display system is provided, for example, at a peripheral portion of the visual field that is downward from the driver's visual field center (gaze direction), or at a peripheral region of the visual field that is upward from the driver's visual field center. A light source can be provided on the instrument panel 2 or the lower part of the windshield 1 as a downward portion of the center of the visual field. A light source can be provided in the upper part of the windshield 1 as the upper part of the visual field center.

  This display area is provided when the driver is in a standard driving posture looking forward, and is provided at a peripheral part of the visual field having substantially the same eccentric angle when the gaze direction in FIG. It has been. This eccentric angle is preferably 10 degrees or more and 30 degrees or less with respect to the center of the visual field, and the difference in contrast sensitivity depending on the orientation with respect to the visual field center can be ignored.

  This information display system has a functional configuration as shown in FIG. 2, for example. The information display system includes a display device 11 and a display control device 12. The display control device 12 is actually composed of a ROM, a RAM, a CPU, and the like, but functions that can be realized by the CPU performing processing according to an information display program stored in the ROM as a block. explain. In the first embodiment, a description will be given of what presents an instantaneous fuel consumption value of a vehicle as a traveling state of the vehicle.

  The display device 11 is a display unit that is provided in a peripheral visual field that is distant from the central visual field of the driver and displays information to be presented to the driver. As shown in FIG. 3A, the display device 11 includes a plurality of LEDs 32 a to 32 i that are a plurality of point light sources provided on the circuit board 31 (hereinafter simply referred to as “LED 32” when collectively referred to). And a diffusion plate 33 provided between the plurality of LEDs 32 and the driver.

  The plurality of LEDs 32 are arranged according to a predetermined positional relationship. The LED 32 is turned on or off in accordance with a control signal from the display control device 12, and brightness and color are controlled. Thereby, the LED 32 controls the display pattern that appears depending on the overall lighting state of the display device 11. In this information display system, the LEDs 32a to 32i are composed of nine LEDs arranged along the shape of the upper half of the horizontally long ellipse.

  The diffuser plate 33 is provided between the plurality of LEDs 32 and the driver and in the radiation direction of the emitted light of the LEDs 32. The diffusion plate 33 diffuses the radiated light of the LED 32 and reduces the luminance of the LED 32. The diffusion plate 33 is configured to convert the luminance distribution of the LED 32 to approximate a Gaussian distribution. That is, as shown in FIG. 3B, the diffuser plate 33 has a luminance distribution such that the center position of the LED 32 has the highest brightness and the brightness gradually decreases as the distance from the center position increases. Convert. The diffused light transmitted by the diffusing plate 33 is visually recognized by the observer as having a Gaussian luminance distribution.

  It should be noted that a display frame provided between the diffusion plate 33 and the observer and shielding the diffused light is not provided. Therefore, the emitted light of one LED 32 becomes a stain-like display pattern having no luminance edge, with the center being brighter and gradually becoming darker as the periphery becomes the same as the background. Accordingly, the brightness distribution of each LED 32 and the entire display pattern composed of a plurality of stain patterns formed by the arrangement of the LEDs 32 are visible by peripheral vision and do not induce central vision (Japanese Patent Laid-Open No. 2006-2006). No. 184854, Masami Funagawa Low spatial frequency pattern that does not include a spatial luminance edge necessary to satisfy the ambient information display method based on the spatio-temporal frequency characteristics of the visual field, automotive technology, 40, 5, 1191-1196.) Form. The condition that this display pattern is visible by peripheral vision and does not induce central vision will be described later.

  In this information display system, a light source other than the LED 32 may be used as the point light source. Further, the diffuser plate 33 is not necessarily optically designed as long as it can realize a diffused light distribution that does not include a luminance edge among various opaque thin plate-like materials.

  As shown in FIG. 2, the display control device 12 includes a traveling state detection unit 21, an image control unit 22, and an image generation unit 23.

  The traveling state detection unit 21 functions as a traveling state detection unit that detects the traveling state of the vehicle. In the first embodiment, the traveling state detection unit 21 acquires the instantaneous fuel consumption value of the vehicle. For this purpose, the traveling state detection unit 21 acquires a sensor signal from, for example, a sensor necessary for calculating the fuel consumption. Then, the traveling state detection unit 21 calculates an instantaneous fuel consumption value of the vehicle based on the sensor signal and supplies the calculated value to the image control unit 22.

  The image control unit 22 sets the light emission mechanism of the LEDs 32 a to 32 i based on the traveling state of the vehicle supplied from the traveling state detection unit 21. This light emission mechanism includes a temporal light emission mechanism and a spatial light emission mechanism between the LEDs 32a to 32i. The temporal light emission mechanism is a display order or lighting timing between the LEDs 32a to 32i, and is a rule for moving the display pattern. The spatial light emission mechanism is the luminance or chromaticity of each of the LEDs 32a to 32i, and is a rule of how the entire display pattern spreads, luminance, color, and the like at a certain moment.

  The image control unit 22 can display two display patterns whose luminance distribution is a Gaussian distribution symmetrically with respect to the array length L of the nine LEDs 32a to 32i. The upper part of FIG. 4 shows a case where only one display pattern 11a whose luminance distribution is a Gaussian distribution among the array length L of the display device 11 is displayed. That is, as shown in the lower part of FIG. 4, the image control unit 22 sets the horizontal axis as the array length L along the nine LEDs 32a to 32i, sets the vertical axis as luminance, and sets the luminance distribution along the horizontal axis as Gaussian. Increase or decrease according to the distribution. The luminances of the nine LEDs 32a to 32i are determined by the image control unit 22 according to the positions of the LEDs 32a to 32i on the horizontal axis.

  The image control unit 22 increases or decreases the luminance of each LED 32 based on the instantaneous fuel consumption value supplied from the traveling state detection unit 21. Here, the image control unit 22 sets an instantaneous fuel consumption reference value (traveling state reference value) with respect to the instantaneous fuel consumption value (vehicle traveling state) detected by the traveling state detection unit 21 (traveling state reference value setting means). The image control unit 22 controls the display pattern 11a (lighting state) of each LED 32 in accordance with a change in the difference between the instantaneous fuel consumption value detected by the traveling state detection unit 21 and the set instantaneous fuel consumption reference value.

  At this time, the image control unit 22 displays the two display patterns 11a centering on the array center (LED 32e) of the LEDs 32a to 32i according to the instantaneous fuel consumption value output from the traveling state detection unit 21. In each display pattern 11a, a display range of the array length L in the display device 11 is set according to the instantaneous fuel consumption value. Further, the image control unit 22 reciprocates the two display patterns 11a to the left and right with opposite phases in accordance with a sine wave having a constant time frequency T.

  For example, when displaying the display pattern 11a whose instantaneous fuel efficiency value is higher than the instantaneous fuel efficiency reference value and smaller than the minimum range of the array length L, by turning on only the LED 32e as shown in FIG. Only diffused light e having a luminance distribution of Gaussian distribution (motion amplitude A = 0) is displayed. In addition, the amplitude of the reciprocating motion of the diffused light e including the diffused light e is set to zero.

  When displaying the display pattern 11a whose instantaneous fuel consumption value is lower than the instantaneous fuel consumption reference value and larger than the maximum range of the array length L, as shown in FIG. 5B, all the LEDs 32a to 32i are turned on. To display the diffused lights a to i having the movement length A of the array length L / 2. Here, one display pattern 11a is formed by the diffused light a to e, and another display pattern 11a is formed by the diffused light e to i. Further, when the instantaneous fuel consumption value is in a normal range with respect to the instantaneous fuel consumption reference value, the motion amplitude A is displayed in a range of 0 to L / 2 according to the difference between the instantaneous fuel consumption value and the instantaneous fuel consumption reference value. The brightness of the pattern 11a reciprocates.

  Thereby, the image control part 22 controls the lighting state of each LED32a-32i so that it may not generate | occur | produce the area | region where a brightness | luminance changes in steps in each LED32a-32i even if it is a case where the driving state of a vehicle changes. .

  In addition to the example shown in FIG. 5, the image control unit 22 displays the display pattern 11 a in which the instantaneous fuel consumption value is higher than the instantaneous fuel consumption reference value and smaller than the minimum range of the array length L (FIG. 6 ( As shown in a), by turning on only the LED 32a, the display pattern 11a having the motion amplitude A of 0 and only the diffused light a may be displayed. Further, when displaying the display pattern 11a whose instantaneous fuel consumption value is lower than the instantaneous fuel consumption reference value and larger than the maximum range of the array length L, as shown in FIG. 6B, all the LEDs 32a to 32i are turned on. By doing so, you may display the display pattern 11a which consists of diffused light ae of the movement amplitude A of arrangement length L / 2.

  The size of the display pattern 11a in which the luminance distribution is a Gaussian distribution is determined by the distance between both ends of the Gaussian distribution in which the luminance value is zero. When the instantaneous fuel consumption value is displayed smaller than the minimum range of the array length L in the display device 11, the size B of the display pattern 11a is L / 4 as shown in FIG. When the instantaneous fuel consumption value is displayed to be larger than the maximum range of the array length L in the display device 11, the size B of the display pattern 11a is set to L / 3 as shown in FIG. When the instantaneous fuel consumption value is within the range of the arrangement length L of the display device 11, the size B of the display pattern 11a is set to L / 4 to L / 3. The luminances of the LEDs 32a to 32i that display a range in which two display patterns 11a having a Gaussian luminance distribution overlap each other are the sum of luminance values given from the Gaussian distribution of the display pattern 11a. Thereby, the image control part 22 controls a lighting state so that the area | region where a brightness | luminance changes in steps in the area | region where the light radiated | emitted from each LED32a-32i overlaps may not be generated.

  When the instantaneous fuel consumption value is smaller than the minimum range of the array length L, that is, when the instantaneous fuel consumption value is a desirable value, the image control unit 22 sets the emission color of the LEDs 32a to 32i to blue. When the instantaneous fuel consumption value is not a desirable value, the image control unit 22 sets the light emission color of the LEDs 32a to 32i to white.

  In this way, the luminance values and emission colors of the LEDs 32 a to 32 i set by the image control unit 22 are supplied to the image generation unit 23. The image generation unit 23 generates a control signal that causes each of the LEDs 32 a to 32 i to emit light with the emission color and luminance set by the image control unit 22. And the image generation part 23 supplies a control signal to the display apparatus 11 so that it may become the light emission order and light emission timing of each LED32a-32i.

  As described above, the information display system includes the display device 11 including the plurality of LEDs 32a to 32i and the diffusion plate 33, and can present the traveling state of the vehicle by the display pattern 11a having a Gaussian luminance distribution. In addition, this information display system moves the luminance distribution when the luminance is continuously increased or decreased according to a change in the running state of the vehicle, for example, at a time frequency of 1-7 Hz. Furthermore, the information display system determines the luminance value and color of each LED 32a-32i according to the running state of the vehicle. In this way, the information display system uses the low-space and medium-time-frequency display pattern 11a that does not include a luminance edge in time necessary to satisfy the condition that it can be visually recognized by peripheral vision and does not induce central vision. The traveling state of the vehicle can be recognized. Furthermore, the information display system can control the position of the display pattern 11a finer than the interval between the LEDs 32a to 32i by the above-described image generation mechanism. Thereby, even if it is LED32a-32i which has a spatially intermittent positional relationship, the display pattern 11a can be displayed by the change of a continuous position.

  As a result, when the instantaneous fuel consumption value is high, the display pattern 11a, which is two blurry white and bright stain patterns that reciprocate in the left and right phases along the arrangement of the LEDs 32, is shown. On the other hand, as the instantaneous fuel consumption value decreases, the amplitude of the reciprocating motion decreases and the size of the display pattern 11a also decreases, and the display pattern 11a is limited to the vicinity of the center in the arrangement of the LEDs 32a to 32i. And when it becomes the most desirable instantaneous fuel consumption value, only the center of the arrangement | sequence in LED32a-32i is lighted in blue.

  An observer who can visually recognize such a change in the display pattern 11a in the peripheral visual field can know a continuous change in the instantaneous fuel consumption value through the peripheral vision while driving while visually confirming the front. When the instantaneous fuel consumption value is high, since the movement of the display pattern 11a takes place over a longer distance faster, relatively high visibility can be obtained. However, the display pattern 11a has no temporal and spatial luminance edges. For this reason, even if the display pattern 11a is moved more quickly and over a longer distance, the driver's central vision is not guided to the display device 11. Further, when the instantaneous fuel consumption value is optimal, the movement of the display pattern 11a is no longer visible, and the color of the display pattern 11a changes from white to blue. For this reason, even if the driver has a color blindness, the instantaneous fuel consumption value can be easily recognized from the number of LEDs 32 that are lit and the presence or absence of movement of the display pattern 11a.

  In this information display system, the motion amplitude of the display pattern 11a, the size (envelope shape) and the color of the display pattern 11a are changed according to the instantaneous fuel consumption value as the running state of the vehicle. However, the information display system can also change the time frequency of the motion amplitude of the display pattern 11a.

  The information display system continuously changes not the size (width) of the display pattern 11a but the height of the Gaussian distribution (peak value of luminance) in the display pattern 11a as a change in the envelope shape of the luminance distribution. It is also possible to make it.

Further, the information display system, unless there are intensity edges in the display pattern 11a, from a Gaussian distribution that changes brightness as A ₁ to A ₃ in FIG. 8 (a), A ₁ ~ as shown in FIG. 8 (b) it is also possible to change the lighting state of the display pattern 11a on the luminance distribution other than Gaussian distribution that changes brightness as a _4. At this time, the image control unit 22 sets the interval between the LEDs 32a to 32i to an interval corresponding to a predetermined viewing angle, and sets the minimum value of the interval between the maximum luminance positions of the LEDs 32a to 32i to be equal to or larger than the interval corresponding to the viewing angle. The lighting state is controlled as follows. That is, assuming that the arrangement interval of the LEDs 32a to 32i is X degrees at the driver's viewing angle, and that the conversion point of constant brightness and rise and fall is An in the envelope of the brightness distribution not including the brightness edge, the minimum distance between An and An + 1 The value is set to a viewing angle X degrees or more. This is to avoid temporal luminance edges from occurring in the light emission mechanism of each of the LEDs 32a to 32i corresponding to the change in the luminance distribution of the display pattern 11a.

  Next, in the information display system described above, the condition that the display pattern 11a is visible by peripheral vision and does not induce central vision will be described.

  In this information display system, the driver can recognize the visual resolution of how much the driver can recognize the spatial frequency of the display pattern 11a in the peripheral area of the visual field as information, and the time frequency in the peripheral area of the visual field of the display pattern 11a. It uses the visual resolution of how much can be recognized as. That is, this information display system uses the fact that the visual field range that can be read as information by the driver changes depending on the spatial frequency and temporal frequency of the display pattern, so that the spatial frequency and temporal frequency that can be determined to be readable at the peripheral part of the visual field. Set the range of. And the display pattern 11a corresponding to the range of the said spatial frequency and the time frequency is displayed on a driver | operator's peripheral visual field, and is transmitted as information.

  As a result, when it is desired to present information in a driving scene where it is not desirable to induce eye movement that requires the driver to gaze ahead in the vehicle traveling direction, a time frequency that satisfies the above-mentioned conditions and The display pattern 11a of the spatial frequency is displayed.

  Next, the difference in visual characteristics that changes depending on the region of the visual field range will be described.

  When the temporal frequency changes to 0.57 Hz, 2.28 Hz, and 9.12 Hz, how the contrast sensitivity to the spatial frequency changes for each upward eccentric angle (0 to 50 degrees) from the center of the visual field FIG. 9 (a), FIG. 9 (b) and FIG. 9 (c) show this. In addition, when the time frequency is changed to 0.57 Hz, 2.28 Hz, and 9.12 Hz, how the contrast sensitivity with respect to the spatial frequency is changed for each eccentric angle (0 to 50 degrees) in the left-right direction from the center of the visual field. FIG. 10 (a), FIG. 10 (b), and FIG. Further, when the temporal frequency is changed to 0.57 Hz, 2.28 Hz, and 9.12 Hz, how the contrast sensitivity with respect to the spatial frequency is different for each downward eccentric angle (0 to 50 degrees) from the center of the visual field. FIG. 11A, FIG. 11B, and FIG.

  FIG. 9 to FIG. 11 are based on the actual measurement results of the subjects. The display pattern 11a having the same luminance is presented to the two subjects, the contrast sensitivity is measured, and the maximum contrast sensitivity is measured for each subject. Standardization and spatial frequency standardized at the maximum spatial frequency with standardized contrast sensitivity of 0.01, and then the regression obtained for each eccentric angle under the assumption that the contrast sensitivity due to the peripheral region of the visual field changes continuously. It is a curve. Further, the eccentric angle is 0 degree as the center of the visual field, and increases as 5 degrees, 10 degrees, 20 degrees, 30 degrees, 50 degrees, 70 degrees, and 90 degrees as the distance from the visual field center increases.

  The horizontal axis in FIGS. 9 to 11 is the spatial frequency and represents the roughness and fineness of the spatial luminance change in the display pattern 11a. The time frequency represents the speed of luminance change at an arbitrary position in the image, and depends on the switching interval (frame interval) of the display pattern 11a.

  The vertical axis in FIGS. 9 to 11 is contrast sensitivity, and the minimum contrast ((maximum luminance−minimum) in which the luminance change can be visually recognized in the display pattern 11a in which the luminance changes sinusoidally in the space of each display pattern 11a. Luminance) / (maximum luminance + minimum luminance)).

  Further, in FIGS. 9 to 11, the numerical value on the vertical axis is a numerical value standardized with the contrast sensitivity of the maximum value obtained by the reciprocal of the contrast ((maximum luminance−minimum luminance) / (maximum luminance + minimum luminance)) being 1. is there. The numerical value on the horizontal axis is a numerical value that is standardized with 1 being the highest spatial frequency (maximum value of the cut-off frequency) detected as the contrast sensitivity.

  9 to 11, when the time frequency is low (0.57 Hz) and the central view (eccentric angle is 0 degree), the contrast sensitivity is a bandpass type with respect to the spatial frequency. It has become a characteristic. On the other hand, when the time frequency is a medium condition (2.28 Hz) and the time frequency is a high condition (9.12 Hz), and when the eccentric angle is not a central vision (5 degrees to 90 degrees). The contrast sensitivity has a low-pass characteristic with respect to the spatial frequency.

  That is, there is a peak value of contrast sensitivity with respect to the spatial frequency only under the condition where the temporal frequency is low and the central vision is used, and under other conditions, the contrast sensitivity is higher as the spatial frequency is lower. In other words, when the speed of the luminance change of the display pattern 11a displayed at the center of the visual field of the subject is slow, there is a spatial frequency band where the display pattern 11a is most accurately recognized by the subject.

  9 to 11, as the eccentric angle increases, the cut-off frequency, which is the spatial frequency at which the contrast sensitivity value is 0.01, decreases in all directions (decrease in visual acuity). In other words, regardless of the orientation from the center of the visual field, the display pattern 11a having a higher spatial frequency and a finer luminance change becomes less visible as it is displayed at a position farther from the visual field center.

  Further, in FIGS. 9 to 11, as the eccentric angle increases, the maximum reduction in contrast sensitivity occurs in all directions. That is, regardless of the orientation from the center of the visual field, the display pattern 11a having a lower spatial frequency is more difficult to visually recognize as it is displayed at a position farther from the visual field center.

  Next, as shown in FIGS. 9 to 11 based on the actually measured values, when the time frequency is changed, the contrast sensitivity with respect to the spatial frequency is changed every eccentric angle (0 to 90 degrees) in the vertical and horizontal directions from the center of the visual field. It will be explained that the change can be obtained by calculation.

As this calculation method, low-pass characteristics are calculated excluding band-pass characteristics with a low time frequency and an eccentric angle of 0 degrees. The function for obtaining the characteristics of this low-pass type contrast sensitivity is as shown in Equation 1 below.
S = 1−EXP (−EXP (− (Fs−Pp) / Sp)) (Formula 1)
It is expressed by In Equation 1, S (Contrast Sensitivity) indicates contrast sensitivity, and Fs (Spatial Frequency) is a spatial frequency. In addition, the parameter Sp (Spread Parameter) in Expression 1 is expressed by Expression 2, and the parameter Pp (Position Parameter) is expressed by Expression 2.

Sp = (S1 + S2) × Ec ^ S3 (Formula 2)
Pp = (P1 + P2) × Ec ^ P3 (Formula 3)
Here, Ec (Eccentricity) in Equation 2 and Equation 3 is the retinal eccentric angle [Deg], and S1, S2, S3 and P1, P2, P3 are values shown in FIG. Is substituted.

  Then, by obtaining the contrast sensitivity S by continuously changing the value of the eccentric angle Ec, the eccentric angle that does not exist in FIGS. 9 to 11 with respect to the contrast sensitivity characteristic for each eccentric angle in FIGS. The contrast sensitivity value with respect to the spatial frequency can be interpolated.

Note that a calculation method for obtaining a band-pass type characteristic with a low time frequency and an eccentric angle of 0 degree is as shown in the following Equation 4.
S = -0.015777 + 0.8141 x EXP (-POWER (LOG10 (Fs) +1.513,2) / POWER (0.815,2)) (Formula 4)
It is expressed by In Equation 4, the spatial frequency Fs is a spatial frequency corresponding to the visual acuity of central vision, and the contrast sensitivity S can be calculated as a numerical value standardized with the maximum sensitivity being 1.

  Next, in FIGS. 13A to 13C, when the time frequency is 0.57 Hz, 2.28 Hz, and 9.12 Hz, the visual field range having the contrast sensitivity of 10% of the maximum sensitivity is shown for each spatial frequency. Shown in

  The vertical axis and horizontal axis in FIG. 13 correspond to the vertical axis and horizontal axis of the visual field and represent the eccentric angle. Further, in FIG. 13, similarly to FIG. 1, the spatial frequency value (minimum value 0.025) standardized in the range of 0 to 1 is shown. In addition, the numerical value of the spatial frequency in FIG. 13 is a value when the spatial frequency Fa that can be visually recognized by the subject is 1, corresponding to the visual acuity Va of the central vision (the reciprocal of the minimum separation value indicated by the viewing angle). Here, since the spatial frequency Fa = 30 Va (Visual Acuiy: visual acuity), when the visual acuity is 0.7, the spatial frequency Fa = 21 cpd (cycles per degree) that the subject can visually recognize. In addition, when the numerical value in FIG. 13 is 0.025, for example, it represents 0.025 × 21 = 0.53 cpd.

  Further, the change in the visual field range shown in FIG. 13 is also based on the actual measurement value with respect to the change in the visual field range by the subject, and for an azimuth having no actual measurement value, an ellipse is regressed between adjacent azimuths.

  13A, 13B, and 13C, the range in which the contrast sensitivity of 10% is obtained in the upward visual field is narrow regardless of the change in the time frequency. From this FIG. 13, it is possible to estimate the visible field range with respect to the spatial frequency. That is, as shown in FIGS. 13A to 13C, the spatial frequency visible at the center of the visual field decreases to 0.40, 0.24, and 0.16 as the time frequency increases. The low spatial frequency that can be visually recognized in the area is a medium time frequency condition (2.28 Hz), and is visible in the widest range.

  Thus, the visual recognition range changes depending on the time frequency condition and the spatial frequency condition. FIG. 14 shows a result of estimating for each spatial frequency how the eccentric angle, which is a visible range, changes due to a change in time frequency. In FIG. 14, the horizontal axis is the time frequency, and the vertical axis is the eccentric angle. From FIG. 14, it can be seen that as the spatial frequency decreases, the eccentric angle at which the contrast sensitivity is obtained increases, and the visual field range in which the contrast sensitivity can be obtained becomes wider. As the spatial frequency decreases, the peak value of the eccentric angle is obtained. The corresponding optimal time frequency tends to be high.

  As described above, when the visual field range visible to the driver is set from the visual characteristics shown in FIGS. 9 to 14, the combination of the time frequency condition and the spatial frequency condition of the display pattern 11a is determined. Can do.

  That is, in any part of the driver's visual field range, the spatial frequency lower than the highest spatial frequency (cutoff frequency) having contrast sensitivity as shown in FIG. Determine a time frequency in the range of ± 0.5 logunit from the optimum time frequency shown. And the display pattern 11a which can be visually recognized in the arbitrary site | parts of a driver | operator's visual field range is shown by displaying the display pattern 11a comprised from the temporal and spatial luminance change (Fourier component) based on the sine wave. be able to.

  In other words, ± 0 from the condition of the spatial frequency component equal to or lower than the spatial frequency of the cutoff frequency in a specific visual field peripheral region (see FIG. 9) and the optimal time frequency at which the peak value of the eccentric angle at the spatial frequency is obtained. A display pattern 11a that satisfies both the condition of time frequency (see FIG. 14) within the range of .5 logunit is generated.

  As a result, when the information display system conveys information by presenting an image to the observer, the information display system can be used for a peripheral area of the visual field that is away from the central visual field of the observer in a standard posture. The display pattern 11a, which is an image composed of frequency components in the range of the temporal frequency and the spatial frequency, which are the temporal frequency and the spatial frequency at which the contrast sensitivity of the observer can be obtained and which has no temporal edge and the spatial edge, is displayed. .

  That is, the space of each image when the display pattern 11a is displayed by continuously switching a plurality of images whose luminance is changed sinusoidally in the vertical direction or the horizontal direction in the display pattern 11a or in an arbitrary oblique direction according to the time frequency. The frequency is set to a range equal to or lower than the cut-off frequency at which the contrast sensitivity of the observer around the visual field is reduced to a predetermined value such as 0.01. At the same time, the time frequency is set to a range of ± 0.5 logunit from the optimum time frequency at which the peripheral part of the visual field far from the central visual field of the observer becomes the widest.

Such an information display system according to the first embodiment exhibits the following effects.
The information display system uses a display device 11 provided in a peripheral visual field distant from a driver's central visual field to diffuse a plurality of point light sources and radiated light of each point light source to reduce the brightness of each point light source. It consists of and. As a result, the information display system can present information to the driver at a lower cost than when the liquid crystal display is provided.

  That is, in order to display the difference between the current driving state and a specific driving state in a form that is visible with peripheral vision and does not interfere with central vision, as described above, a low spatial frequency and a medium time frequency are used. It is necessary to display the low-pass or narrow-band display pattern 11a. For such display, a display device 11 including LEDs 32 a to 32 i and a diffusion plate 33 is employed instead of a liquid crystal display. Accordingly, since the display surface has a sufficiently large display surface that does not generate a luminance edge due to shielding of the diffused lights a to i, if the diffusion characteristics of the diffusion plate 33 are isotropic and uniform, there is no high spatial frequency component. A low-pass pattern resembling a Gaussian distribution with no spatial brightness edge can be generated at low cost. In addition, a dot matrix type display capable of multi-tone display must secure an installation location as a surface. However, in the case of a point light source array such as the display device 11, it can be arranged as a line, so that the degree of freedom in layout is high. .

  Further, according to this information display system, the diffuser plate 33 converts the luminance of the LEDs 32a to 32i into a luminance distribution that approximates a Gaussian distribution. It can be displayed in a form that does not interfere.

  Furthermore, according to the information display system, the display pattern 11a of the LEDs 32a to 32i is controlled in accordance with the change in the difference in the running state reference value with respect to the running state of the vehicle. The running state of the vehicle can be recognized by being visible with peripheral vision. That is, it is possible to recognize the instantaneous fuel consumption value of the vehicle without displaying it on a liquid crystal display or the like and without disturbing the driving of the vehicle.

  Furthermore, according to the information display system, one or a plurality of lighting states among the luminance or chromaticity of each of the LEDs 32a to 32i, the display order between the LEDs 32a to 32i, or the lighting timing are controlled. The driver can be made aware of changes in the running state of the vehicle.

  Further, according to the information display system, the interval between the LEDs 32a to 32i is set to an interval corresponding to a predetermined viewing angle, and the minimum value of the interval between the maximum luminance positions of the LEDs 32a to 32i is set to be equal to or larger than the interval corresponding to the viewing angle. Control the lighting state. Thereby, the information display system can also change the position of the display pattern 11a continuously when the lighting state is controlled according to the running state of the vehicle and the position of the luminance distribution is continuously changed. . That is, a change in position finer than the distance between the LEDs 32a to 32i can be displayed. At this time, the observer can recognize the change in the continuous position of the virtual luminance distribution instead of the arrangement of the LEDs 32a to 32i. Therefore, according to this information display system, the display pattern 11a having a low spatial frequency and a medium time frequency that is visible with the driver's peripheral vision and does not interfere with the central vision can be reduced without reducing the amount of transmitted information. Can be displayed by cost.

  Furthermore, according to the information display system, since the lighting state is controlled so as not to generate a region where the luminance changes stepwise in each of the LEDs 32a to 32i, the display device 11 is displayed by displaying stepwise luminance edges. The possibility of inducing central vision can be eliminated.

  Furthermore, according to the information display system, since the lighting state is controlled so as not to generate a region where the luminance changes stepwise in the region where the light emitted from each LED 32a to 32i overlaps, the diffused light of each LED 32a to 32i Even if they overlap spatially, no luminance edge is generated by the addition of diffused light. For this reason, even if the lighting pattern is controlled and the display pattern 11a changes, the luminance edge is generated temporally and spatially, and the possibility of inducing central vision can be eliminated.

[Second Embodiment]
Next, an information display system according to the second embodiment will be described. In addition, about the part similar to the above-mentioned 1st Embodiment, the detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The information display system shown as the second embodiment will be described with respect to the information on the traveling state of the other vehicle on the rear side as the traveling state of the vehicle. Similarly to the first embodiment, this information display system is also, for example, a display device 11 that is located in the lower front of the driver's field of view in a standard driving posture and in the range of 10-20 degrees from the point of sight. By this, the running state of the vehicle is recognized.

  In this information display system, the traveling state detection unit 21 acquires distance information and direction information from another vehicle existing behind the host vehicle and outputs the information to the image control unit 22. The traveling state detection unit 21 is connected to, for example, a sensor that detects an obstacle behind and behind the vehicle, and calculates distance information and direction information with respect to another vehicle by receiving a sensor signal. Here, the reference value is the position of the host vehicle 100, and the position of the other vehicle 200 is a difference in the running state of the vehicle.

  As illustrated in FIG. 15, the image control unit 22 sets the display range of the other vehicle on the display device 11 as, for example, a range of 180 degrees behind the host vehicle 100 and a distance of 40 m. The image control unit 22 determines which of the left and right sides of the display area of the display device 11 the display pattern 11a is displayed based on the orientation information.

The image control unit 22 associates the rear side area with respect to the host vehicle 100 and the LEDs 32 a to 32 i as display areas of the display device 11. Left side area A _L with respect to the vehicle 100 shown in FIG. 15, as shown in FIG. 16, corresponding to LED32e as a display area of the display device 11. Right side region A _R with respect to the vehicle 100 shown in FIG. 15, as shown in FIG. 16, corresponding to LED32e as a display area of the display device 11. Region B _L left rear side with respect to the vehicle 100 shown in FIG. 15, as shown in FIG. 16, corresponding to LED32c as a display area of the display device 11. Right laterally rearward area B _R with respect to the vehicle 100 shown in FIG. 15, as shown in FIG. 16, corresponding to LED32g as a display area of the display device 11. Region C _L left laterally rearward with respect to the vehicle 100 shown in FIG. 15, as shown in FIG. 16, corresponding to LED32a as a display area of the display device 11. Right laterally rearward region C _R with respect to the vehicle 100 shown in FIG. 15, as shown in FIG. 16, corresponding to LED32i as a display area of the display device 11.

  Thereby, the image control unit 22 can determine the display position of the display pattern 11 a on the display device 11 from the distance information and the direction information of the other vehicle 200. The image control unit 22 causes the LEDs 32a to 32e to display a display pattern 11a having a Gaussian distribution, and causes the LEDs 32e to 32i to display a display pattern 11a having a Gaussian distribution. Further, the image control unit 22 sets the size of the Gaussian distribution in each display pattern 11a as the array length L / 4. That is, the display pattern 11a is displayed on the outer side (LEDs 32a, 32i) of the LEDs 32a to 32i as the distance from the host vehicle 100 to the other vehicle 200 increases. The display pattern 11a is displayed on the center side (LED 32e) of the LEDs 32a to 32i as the distance from the host vehicle 100 to the other vehicle 200 is smaller.

  Furthermore, the image control unit 22 vibrates the display pattern 11a according to a sine wave having a time frequency of 1-7 Hz according to the distance from the other vehicle 200. In addition, the image control unit 22 sets the color of the display pattern 11a to yellow. At this time, the image control unit 22 causes all the LEDs 32 outside the display position of the determined display pattern 11a, that is, the LEDs 32 corresponding to a distance farther than the other vehicle 200 on the same side as the other vehicle 200 to emit white light.

  By such a light emission mechanism of the LED 32, the information display system can display, for example, the position of the other vehicle 200 approaching from behind by blinking (movement) and color of the display pattern 11a appearing by the LEDs 32a to 32i. Furthermore, the information display system can display the distance to the other vehicle 200 by the length of the display pattern 11a.

  Thus, the driver can recognize the presence of the other vehicle 200 on the rear side, the direction and the distance of the other vehicle 200 through peripheral vision without interrupting the forward viewing. In addition, the driver can recognize whether the other vehicle 200 is approaching or leaving the host vehicle 100 and how fast it is approaching or leaving by recognizing the change in the display pattern 11a.

  It is effective to present such information of the other vehicle 200 in a scene where the host vehicle 100 joins at a junction or a scene of lane change. As described above, by presenting the information on the other vehicle 200 as the display pattern 11a, even if it is necessary to finally confirm the other vehicle 200 by visual observation, the information on the other vehicle 200 can be recognized in advance. Can do. For this reason, the driver | operator's load for recognizing the other vehicle 200 in the case of merge and a lane change can be reduced significantly.

  Further, the position of the other vehicle 200 is doubly encoded by the movement and color of the display pattern 11a. For this reason, even if the driver has color vision abnormality, the other vehicle 200 can be recognized without any trouble.

  Furthermore, the sound of the other vehicle 200 approaching from the rear side of the information display system may be reproduced by sound field processing to reproduce the movement of the sound source in the 3D space and be synchronized with the visual display. For example, as shown in FIG. 17, the information display system includes an acoustic control unit 41 and an acoustic generation unit 42 connected to the traveling state detection unit 21.

  The acoustic control unit 41 acquires the azimuth information and distance information of the other vehicle 200 as the traveling state of the vehicle output from the traveling state detection unit 21. The acoustic control unit 41 controls the movement of the sound source generated in the vehicle interior based on the acquired azimuth information and distance information. The sound generation unit 42 drives the sound output unit 4 (speaker) based on the sound source movement calculated by the sound control unit 41. The audio output unit 4 includes a plurality of speakers, and can move the sound source by superimposing sounds. Accordingly, the sound control unit 41 controls the sound source based on the region where the other vehicle 200 exists as illustrated in FIG. 15, and performs sound field processing according to the azimuth and distance of the other vehicle 200.

  Thereby, the information display system can easily grasp the meaning of the visual display change by the display pattern 11a, and can deal with the presence of the approaching other vehicle 200 with higher certainty. Enhancing redundancy by encoding with such multimodal information display or a plurality of attribute changes of the display pattern 11a does not necessarily increase the amount of transmitted information. However, it has the effect of increasing the driver's awareness of information, ease of understanding of meaning, reliability of information, and confidence in coping behavior. Note that the information display system may add sound effects only when the other vehicle 200 is approaching the host vehicle 100 instead of reproducing sound source movement by sound field processing.

  Such an information display system according to the second embodiment is similar to the first embodiment in that the display device 11 provided in the peripheral visual field far from the driver's central visual field includes a plurality of point light sources and each point light source. Since it is composed of a diffusing plate that diffuses radiated light and lowers the luminance of each point light source, information can be presented to the driver at a lower cost than when a liquid crystal display is provided.

  In addition, according to this information display system, the lighting state of the display device 11 can be controlled in accordance with the type of the vehicle traveling state detected by the traveling state detection unit 21. For example, attributes such as the size, position, brightness, and chromaticity of the display pattern 11a are changed according to the instantaneous fuel consumption value as in the first embodiment and the distance and direction from another vehicle as in the second embodiment. be able to. That is, in the first embodiment, the instantaneous fuel consumption information of the vehicle is presented by the spread of the display pattern 11a, whereas in the second embodiment, the distance and direction from another vehicle are presented by the position of the display pattern 11a. Moreover, the magnitude | size and speed of the change of the display pattern 11a can be changed according to the condition of the distance and azimuth | direction of an instantaneous fuel consumption value and another vehicle. Thereby, according to the information display system, in order to tell the observer the index indicating the current driving state and the magnitude of the difference between the current driving state and the specific driving state, it is changed according to the type of information to be displayed. The combination of attributes can be changed, and a plurality of information can be displayed without confusing the driver.

  Furthermore, according to this information display system, even when the presence of the other vehicle 200 is presented as the traveling state of the vehicle, a sound effect synchronized with the lighting state of the display pattern 11a is output. Thereby, according to this information display system, a sound effect synchronized with the change of the display pattern 11a can be output, and sensory stimuli of other modalities are synchronized. For this reason, a driver | operator can be made to recognize as a highly redundant and easy-to-understand display with respect to the display apparatus 11, and the accuracy of information acquisition can be improved.

[Third Embodiment]
Next, an information display system according to the third embodiment will be described. Note that parts similar to those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The information display system shown as the third embodiment will be described with respect to the vehicle running state that recognizes the vehicle speed of the host vehicle. Similarly to the first embodiment, this information display system is also, for example, a display device 11 that is located in the lower front of the driver's field of view in a standard driving posture and in the range of 10-20 degrees from the point of sight. By this, the running state of the vehicle is recognized.

  In this information display system, the traveling state detection unit 21 acquires the vehicle speed of the host vehicle and outputs it to the image control unit 22. The traveling state detection unit 21 is connected to, for example, a vehicle speed sensor, and acquires the vehicle speed by receiving a sensor signal.

  As shown in FIG. 18, the display device 11 in this information display system includes a plurality of LEDs 32 arranged in an arc shape. The display device 11 includes a central LED 32C of the display device 11, first LEDs 32a to 32s arranged outside the central LED 32C, and second LEDs 32a to 32s arranged further outside the first LEDs 32a to 32s. . Each of the first LEDs 32a to 32s and the second LEDs 32a to 32s is spaced apart from each other on the radiation extending every 10 degrees from the central LED 32C. In such a display device 11, the first LED 32a to 32s and the second LED 32a to 32s have an oval outer shell, and the display pattern changes in luminance according to a Gaussian distribution in the two-dimensional directions of the angle direction A and the radiation direction B, respectively. 53 is displayed.

  The traveling state detection unit 21 outputs the detected difference between the detected vehicle speed and the legal speed to the image control unit 22.

  The image control unit 22 sets the display range of the vehicle speed of the host vehicle on the display device 11, and displays a display pattern 53 having a Gaussian distribution of luminance distribution at the display position of the vehicle speed value within the display range. The size of the display pattern 53 is, for example, 20 degrees or more in the angular direction A in FIG. 18 with the horizontal axis as the angular direction A as shown in FIG. Further, the size of the display pattern 53 is set as the distance from the center of the arc that is the central LED 32C in the radiation direction B in FIG. 18, as shown in FIG. The size of the display pattern 53 in the radiation direction B is three times the interval between the LEDs 32 on the same radiation from the central LED 32C that is the center of the arc.

  The image control unit 22 changes the amplitude when vibrating the position of the display pattern 53 based on the difference between the vehicle speed of the host vehicle supplied from the traveling state detection unit 21 and the legal speed. The image control unit 22 increases the amplitude for vibrating the display pattern 53 when the vehicle speed of the host vehicle is equal to or lower than the legal speed, and the amplitude for vibrating the display pattern 53 when the vehicle speed of the host vehicle exceeds the legal speed. Double. Further, the image control unit 22 vibrates the position of the display pattern 53 in the radiation direction B according to a sine wave along the horizontal axis at a constant time frequency within the range of the time frequency 1-7 Hz.

  Further, the image control unit 22 determines the luminance of the specific LED 32 at a certain time by multiplying the position of the display pattern 53 in the angle direction A and the position of the display pattern 53 in the radiation direction B. However, the image control unit 22 determines the brightness of the central LED 32C only from the value in the radiation direction B. That is, in the elliptical two-dimensional Gaussian distribution display pattern 53 shown with the LEDs 32 arranged as shown in FIG. 18, the luminance of the LED 32 at the position overlapping the two-dimensional Gaussian distribution is the two-dimensional Gaussian distribution at that position. It is determined by the brightness.

  Further, the image control unit 22 sets the emission color of each LED 32 to white when the vehicle speed is equal to or lower than the legal speed, and to orange when the vehicle speed exceeds the legal speed. Thereby, the image control unit 22 controls the color of the display pattern 53.

  As described above, this information display system can present the vehicle speed of the host vehicle depending on the position of the display pattern 53 or the orientation of the distribution of the display pattern 53 radiating from the central LED 32C. In the example of FIG. 18, it can be recognized that it is about 30 km / h, for example. Further, the information display system can present whether or not the vehicle speed of the host vehicle exceeds the legal speed by the magnitude of vibration of the display pattern 53 in the radiation direction B and the emission color.

  In the information display system according to the third embodiment, as in the first embodiment, the display device 11 provided in the peripheral visual field far from the central visual field of the driver is connected to a plurality of point light sources and each point light source. Since it is composed of a diffusing plate that diffuses radiated light and lowers the luminance of each point light source, information can be presented to the driver at a lower cost than when a liquid crystal display is provided.

  Accordingly, the driver can recognize the vehicle speed, the relationship between the vehicle speed and the legal speed, and the speed change (acceleration) through the peripheral vision without interrupting the forward visual recognition. For example, even when the vehicle is traveling at a constant vehicle speed, the vehicle speed of the host vehicle can be easily recognized by the shaking of the display pattern 53 that occurs in the radiation direction B from the display center of the center LED 32C in the display device 11. When the vehicle speed of the host vehicle exceeds the legal speed, not only the emission color of the display pattern 53 changes but also the magnitude of the shaking of the display pattern 53 changes. The relationship between the legal speed and the vehicle speed of the host vehicle can be recognized without hindrance.

  Furthermore, this information display system is easily understood as an analogy of an existing analog speedometer as included in the meter display unit 3 in order to encode the vehicle speed of the host vehicle as the direction of the display pattern 53. Further, the information display system can display more finely than the arrangement interval of the LEDs 32 by setting the one corresponding to the pointer as the brightest point in the display pattern 53, and in principle, it is more than the existing histogram-like digital display. The speed can be displayed with fine accuracy.

  Furthermore, according to this information display system, the display pattern 53 is a plurality of bright stain-like patterns that do not include a luminance edge and does not induce central vision. On the other hand, existing analog speedometers are composed of clear numbers, scales and pointers. This information display system can display a display pattern 53 as a background of an existing analog speedometer included in the meter display unit 3. That is, the display pattern 53 is configured by an image having a low spatial frequency and a medium temporal frequency component, and the existing analog speedometer is mainly configured by a pattern having a high spatial frequency and a low temporal frequency component. Does not interfere with each other. That is, when driving while looking forward, the driver can only see the display pattern 53, and when the focus is shifted to the analog speedometer in a situation where there is a margin in driving, the driver will be shown by the existing analog speedometer. You can see the speed. Thus, even when the analog speedometer is visually recognized, the blurred display pattern 53 with the background shaking does not make it difficult to see the hands, numbers, and scales. Furthermore, the display pattern 53 can add information on the relationship with the legal speed that is not displayed on the existing analog speedometer in the form of a change in the background color.

  As described above, according to the information display system shown as the third embodiment, when the lighting state of the display device 11 is controlled, the brightness displayed by each LED 32 between the plurality of LEDs 32 or on each LED 32. A display pattern 53 having a higher spatial frequency than the distribution can be superimposed. For example, the display pattern 53 can be displayed on the background of an existing analog speedometer. In addition to the analog speedometer, other elements such as the engine speed may be used.

  That is, according to the information display system, when the attributes such as the shape, size, position, brightness, and chromaticity of the display pattern 53 are changed and the magnitude and speed of the change of the attribute are changed, the display pattern 53 is adjacent to the display pattern 53. High spatial frequency patterns such as code information such as numbers and icons and scales are superimposed on the area and display pattern 53. For this reason, according to the information display system, it is possible to give absolute value information that is difficult to convey by a change in the display pattern 53 of the arrangement of the LEDs 32 when viewed from the central view without impairing information acquisition by peripheral vision.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

  For example, in the first and second embodiments described above, the number of LEDs 32a to 32i is nine. However, even if the number of LEDs 32 is changed to five and the total length is halved, the number of LEDs 32 is reduced to three. Even if the total length is changed to 1/3, the same effect can be obtained. However, as in the above-described embodiment, when information is recognized using changes in the amplitude, position, and length of movement in the display pattern, it is advantageous that the number of LEDs 32 is large and the total length is long.

  However, even if the number of LEDs 32 is one, information can be transmitted by controlling changes in the blinking frequency, duty ratio, brightness change amplitude, brightness time average, and the like of the LED 32. . That is, even when the number of LEDs is one blinking, the low space that does not include a luminance edge in terms of time and space in order to satisfy the condition that it can be visually recognized by peripheral vision and does not induce central vision. A display pattern having a frequency and a medium time frequency may be formed.

DESCRIPTION OF SYMBOLS 1 Windshield 2 Instrument panel 3 Meter display part 4 Audio | voice output part 11 Display apparatus 11a Display pattern 12 Display control apparatus 21 Running condition detection part 22 Image control part 23 Image generation part 31 Circuit board 32 LED
33 Diffusion plate 41 Sound control unit 42 Sound generation unit 53 Display pattern

Claims (11)

Provided in a peripheral visual field away from the driver's central visual field, comprising display means for displaying information to be presented to the driver,
The display means is provided with a plurality of point light sources arranged according to a predetermined positional relationship, and between the plurality of point light sources and the driver, in a radiation direction of the radiated light of each point light source. An diffusing plate that diffuses the radiated light to lower the brightness of each point light source.   The information display apparatus according to claim 1, wherein the diffusion plate is configured to convert the luminance of the point light source into a luminance distribution approximate to a Gaussian distribution. Traveling state detecting means for detecting the traveling state of the vehicle;
Traveling state reference value setting means for setting a traveling state reference value for the traveling state of the vehicle detected by the traveling state detection means;
Control for controlling the display pattern of the point light source in accordance with a change in the difference between the traveling state of the vehicle detected by the traveling state detection unit and the traveling state reference value set by the traveling state reference value setting unit The information display device according to claim 1, further comprising: means.   The information according to claim 3, wherein the control means controls one or a plurality of lighting states among luminance or chromaticity of each point light source, a display order between the point light sources, or lighting timing. Display device.   The control means sets the interval between the point light sources to an interval corresponding to a predetermined viewing angle, and the lighting state so that the minimum value of the maximum luminance position interval at each point light source is equal to or larger than the interval corresponding to the viewing angle. The information display device according to claim 1, wherein the information display device is controlled.   The information display apparatus according to claim 4, wherein the control unit controls the lighting state so as not to generate a region in which luminance changes stepwise in each point light source.   5. The information according to claim 4, wherein the control unit controls the lighting state so as not to generate a region where the luminance changes stepwise in a region where light emitted from the respective point light sources overlaps. 6. Display device.   5. The information display device according to claim 4, wherein the control unit controls the lighting state in accordance with a type of traveling state of the vehicle detected by the traveling state detection unit.   The information display device according to claim 3, further comprising sound output means for outputting a sound effect synchronized with the lighting state controlled by the control means.   The control means superimposes a display pattern having a higher spatial frequency than the luminance distribution displayed by each point light source between the plurality of point light sources or on each point light source when controlling the lighting state. The information display device according to claim 3. When displaying information to be presented to the driver of the vehicle, the driving state of the vehicle is detected,
A plurality of point light sources arranged according to a predetermined positional relationship, and provided between the plurality of point light sources and the driver in a radiation direction of the radiated light of each point light source, and diffuses the radiated light of each point light source Display means having a diffusion plate that reduces the brightness of each point light source,
An information display method, comprising: displaying a display pattern controlled in accordance with a change in a difference between the detected traveling state of the vehicle and a preset traveling state reference value.