JP7062341B2 - Display device and correction method - Google Patents

Description

The present invention relates to a display device and a correction method.

Conventionally, an infrared LED and an infrared detection device are built in a display device mounted on a vehicle, and infrared rays are emitted and received to detect an operation performed in a space (referred to as an operation area) in front of the display area. The technology is known. According to the display device, when the operator's finger moves to the operation area, infrared rays are reflected and the amount of reflected light increases, so that the operation by the operator can be detected.

Japanese Unexamined Patent Publication No. 2011-86220 JP-A-2015-201067

On the other hand, the amount of reflected light when infrared rays are reflected on the operator's fingers is not always constant. For example, when the image data (so-called pattern) displayed in the display area changes, the amount of reflected light is not always constant. Be affected by that. This is because the degree of deflection of the liquid crystal device changes as the RGB value of the image data changes, and the transmittance of infrared rays changes. Therefore, the detection accuracy may decrease depending on the image data displayed in the display area.

The present invention has been made in view of the above problems, and an object of the present invention is to improve the detection accuracy in a display device that detects an operation performed in an operation area in front of the display area.

According to one aspect, the display device has the following configuration. That is,
A floodlight that transmits infrared rays to the operation area in front of the LCD through the R filter in the display area of the liquid crystal display.
A receiver that receives the reflected light when the floodlight is projected, and a receiver that receives the reflected light.
From the liquid crystal deflection degree calculated based on the R value of each pixel of the image data displayed in the liquid crystal display area, the integrated value of the infrared liquid crystal transmittance is calculated, and the amount of infrared light projected by the floodlight, or It is characterized by having a correction unit for correcting the amount of reflected light received by the light receiver by using the integrated value of the liquid crystal transmittance of the infrared rays .

The detection accuracy can be improved in the display device that detects the operation performed in the operation area in front of the display area.

It is a figure which shows the appearance composition of the display device. It is sectional drawing which shows the arrangement example of each element of a display device, and the light projection range of infrared rays. It is a figure which shows an example of the hardware composition of a display device. It is a figure which shows an example of the hardware composition of a control device. It is a figure which shows an example of the functional structure of the display control part realized in the display device which concerns on 1st Embodiment. It is a figure which shows the detail of the functional structure of the light receiving amount correction part. It is a figure which shows the relationship between the control signal of 1st LED to 4th LED, and the acquisition timing of a PD signal. It is a flowchart which shows the flow of the detection process executed in the display device which concerns on 1st Embodiment. It is a figure which shows an example of the functional structure of the display control part realized in the display device which concerns on 2nd Embodiment. It is a figure which shows the detail of the functional structure of a light projection amount correction part. It is a flowchart which shows the flow of the detection process executed in the display device which concerns on 2nd Embodiment.

Hereinafter, each embodiment will be described with reference to the attached drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals to omit duplicate explanations.

[First Embodiment]
<Appearance configuration of display device, arrangement example of each element and infrared projection range>
First, the appearance configuration of the display device according to the first embodiment, the arrangement example of each element of the display device, and the infrared projection range will be described. FIG. 1 is a diagram showing an external configuration of a display device, and shows a state in which the display device 100 is viewed from the front side. In the following, the width direction when the display device 100 is viewed from the front side is defined as the x-axis direction, and the height direction is defined as the y-axis direction.

As shown in FIG. 1, the display device 100 has a liquid crystal display device 110 that provides a display area for displaying an image, and a non-display area 120 that is located in an outer peripheral region of the display area. Further, the display device 100 has a first infrared LED (Light Emitting Diode) 131 to a fourth infrared LED (Light Emitting Diode) 134, which is an example of a floodlight, inside the non-display area 120. Further, the display device 100 has a PD (Photo Diode) 140, which is an example of a light receiver, inside the non-display area 120. In the following, the first infrared LED to the fourth infrared LED will be abbreviated as the first LED to the fourth LED.

In the example of FIG. 1, the first LED 131 is arranged on the leftmost side toward the display device 100, and the fourth LED 134 is arranged on the rightmost side toward the display device 100. Each of the first LED 131 to the fourth LED 134 emits infrared rays for detecting an operation on the operation area in front of the display area.

Further, as shown in FIG. 1, the PD 140 is arranged in the lower center of the display area, and the operation area in front of the display area is the light receiving range. As a result, the PD 140 can receive the reflected light from the reflector with respect to the infrared rays projected in front of the display area.

FIG. 2 is a cross-sectional view showing an arrangement example of each element of the display device and an infrared projection range. Of these, FIG. 2A is a cross-sectional view of the display device 100 when viewed from the left side. In the following, the direction substantially orthogonal to the display area is referred to as the z-axis direction.

As shown in FIG. 2A, the infrared rays emitted from the first LED 131 to the fourth LED 134 arranged inside the non-display area 120 are guided to the light guide plate 200 and are provided by the liquid crystal device 110 in the display area. The light is projected forward (see the projection range 201 to 204).

FIG. 2B is a cross-sectional view of the display device 100 when viewed from above. As shown in FIG. 2B, it is an operation area located in front of the display area provided by the liquid crystal device 110, and it is assumed that the operator's finger 210 moves to the light projection range 204 of the fourth LED 134, for example. .. In this case, when infrared rays are projected from the fourth LED 134, the projected infrared rays are reflected by the operator's finger 210, and the reflected light is received by the PD 140. As a result, the amount of light received by the PD 140 increases, and the display device 100 detects that the operation has been performed in the light projection range 204.

<Hardware configuration of display device>
Next, the hardware configuration of the display device will be described. FIG. 3 is a diagram showing an example of the hardware configuration of the display device. As shown in FIG. 3, the display device 100 includes a liquid crystal display device 110, first LED 131 to fourth LED 134, PD 140, and a control device 300.

A display control program is installed in the control device 300, and when the program is executed, the control device 300 functions as the display control unit 310. The display control unit 310 displays the image in the display area by outputting the image data to the liquid crystal device 110.

Further, the display control unit 310 outputs a control signal for controlling the projection of infrared rays by the first LED 131 to the fourth LED 134. Further, the display control unit 310 controls the light reception of the PD 140 according to the light projection timing of each of the first LED 131 to the fourth LED 134, and acquires the PD signal received by the PD 140. Further, the display control unit 310 calculates the amount of infrared light received at each projection timing based on the acquired PD signal. Further, the display control unit 310 determines whether or not an operation by the operator has been performed in the operation area in front of the display area based on the calculated light receiving amount.

<Hardware configuration of control device>
Next, the hardware configuration of the control device 300 will be described. FIG. 4 is a diagram showing an example of the hardware configuration of the control device. As shown in FIG. 4, the control device 300 includes an arithmetic unit 401, a storage device 402, a signal output device 403, an image data output device 404, and a signal input device 405. The hardware constituting the control device 300 is connected to each other via the bus 406.

The arithmetic unit 401 is an integrated circuit that functions as a display control unit 310. The storage device 402 is a memory for storing information and the like used when the arithmetic unit 401 functions as the display control unit 310. The signal output device 403 is an output device that outputs a control signal for controlling the first LED 131 to the fourth LED 134 based on a command from the arithmetic unit 401. The image data output device 404 is an image output device that outputs image data generated based on a command of the arithmetic unit 401 to the liquid crystal display device 110. The signal input device 405 is an input device that receives a PD signal from the PD 140 and inputs it to the arithmetic unit 401.

<Functional configuration of display control unit>
Next, the functional configuration of the display control unit 310 will be described. FIG. 5 is a diagram showing an example of a functional configuration of a display control unit realized in the display device according to the first embodiment. As shown in FIG. 5, the display control unit 310 includes an overall control unit 510, an Ir-LED control unit 520, a display unit 530, a detection unit 540, and a light receiving amount correction unit 550.

The overall control unit 510 controls the entire display device 100, outputs a control signal to the Ir-LED control unit 520, and outputs image data to the display unit 530. Further, the overall control unit 510 acquires the detection result from the detection unit 540.

The Ir-LED control unit 520 controls the projection of the first LED 131 to the fourth LED 134 based on the control signal output from the overall control unit 510. Further, the Ir-LED control unit 520 notifies the light receiving amount correction unit 550 of the control signal output from the overall control unit 510.

The display unit 530 controls the liquid crystal device 110 based on the image data output from the overall control unit 510. Further, the display unit 530 notifies the light receiving amount correction unit 550 of the R value among the pixel values (R value, G value, B value) included in the image data output from the overall control unit 510. Here, among the R, G, and B color filters included in the liquid crystal device 110, only the R value is notified. Of the R, G, and B color filters, the R filter substantially transmits infrared rays used for detection, and the G and B filters substantially block infrared rays. This is because it has the characteristic of

The light receiving amount correction unit 550 acquires the PD signal received by the PD 140 via the signal input device 405 based on the control signal notified from the Ir-LED control unit 520. Further, the light receiving amount correction unit 550 corrects the light receiving amount indicated by the acquired PD signal based on the R value notified from the display unit 530, and notifies the detection unit 540 of the corrected light receiving amount.

The detection unit 540 determines whether or not an operation has been performed by the operator in the operation area based on the corrected light reception amount notified by the light reception amount correction unit 550. Further, when the detection unit 540 determines that the operation has been performed by the operator in the operation area, the detection unit 540 notifies the overall control unit 510 of the detection result (information such as that the operation has been performed and the operated position).

<Details of the functional configuration of the light receiving amount correction unit>
Next, the details of the functional configuration of the light receiving amount correction unit 550 will be described. FIG. 6 is a diagram showing details of the functional configuration of the light receiving amount correction unit. As shown in FIG. 6, the light receiving amount correction unit 550 includes a selection unit 610, a transmittance integrating unit 620, a correction unit 630, and a light receiving amount acquisition unit 640.

The selection unit 610 divides the R value notified from the display unit 530 into the first region to the fourth region, and sequentially acquires the R value. As shown in FIG. 6, the display area provided by the liquid crystal device 110 is divided into four areas (first area to fourth area) according to the positions of the first LED 131 to the fourth LED 134. Therefore, the selection unit 610 first acquires the pixel value (R value) of the image data displayed in the first area among the image data displayed in the display area as the first area pixel value (R). Notify the transmittance integrating unit 620.

Subsequently, the selection unit 610 acquires the pixel value (R value) of the image data displayed in the second area among the image data displayed in the display area as the second area pixel value (R), and transmits the image data. Notify the rate integration unit 620.

Subsequently, the selection unit 610 acquires the pixel value (R value) of the image data displayed in the third area among the image data displayed in the display area as the third area pixel value (R), and transmits the image data. Notify the rate integration unit 620.

Subsequently, the selection unit 610 acquires the pixel value (R value) of the image data displayed in the fourth area among the image data displayed in the display area as the fourth area pixel value (R), and transmits the image data. Notify the rate integration unit 620.

The transmittance integration unit 620 calculates the liquid crystal deflection degree of the first region based on the first region pixel value (R) notified by the selection unit 610. This makes it possible to calculate the integrated value of the infrared liquid crystal transmittance in the first region. Similarly, the transmittance integrating unit 620 calculates the liquid crystal deflection degree in the second region based on the second region pixel value (R) notified by the selection unit 610. This makes it possible to calculate the integrated value of the infrared liquid crystal transmittance in the second region.

Similarly, the transmittance integrating unit 620 calculates the liquid crystal deflection degree in the third region based on the third region pixel value (R) notified by the selection unit 610. This makes it possible to calculate the integrated value of the infrared liquid crystal transmittance in the third region. Similarly, the transmittance integrating unit 620 calculates the liquid crystal deflection degree in the fourth region based on the fourth region pixel value (R) notified by the selection unit 610. This makes it possible to calculate the integrated value of the infrared liquid crystal transmittance in the fourth region.

The light receiving amount acquisition unit 640 acquires a PD signal based on the control signal notified from the Ir-LED control unit 520. Here, FIG. 7 shows the relationship between the control signals of the first LED 131 to the fourth LED 134 and the acquisition timing of the PD signal in the light receiving amount acquisition unit 640.

FIG. 7 is a diagram showing the relationship between the control signals of the first LED to the fourth LED and the acquisition timing of the PD signal, the horizontal axis represents time, and the vertical axis represents the ON / OFF timing of light projection or light reception. There is. As shown in FIG. 6, the Ir-LED control unit 520 controls so that ON and OFF of the light projection by each of the first LED 131 to the fourth LED 134 are sequentially executed.

In the case of FIG. 7, the Ir-LED control unit 520 first controls the first LED 131 to emit infrared light. Subsequently, the Ir-LED control unit 520 controls the second LED 132 to emit infrared light. At this time, the Ir-LED control unit 520 controls ON and OFF of the light projection of the first LED 131 and the second LED 132 so that the light projection time zone of the first LED 131 and the light projection time zone of the second LED 132 do not overlap. do.

Subsequently, the Ir-LED control unit 520 controls the third LED 133 so as to emit infrared light. At this time, the Ir-LED control unit 520 controls ON and OFF of the light projection of the second LED 132 and the third LED 133 so that the light projection time zone of the second LED 132 and the light projection time zone of the third LED 133 do not overlap. do.

Hereinafter, the same control is repeated until the light emission of the 4th LED 134 is turned on and off, and when the control of the light projection of the 4th LED 134 is completed, the Ir-LED control unit 520 again emits infrared rays to the 1st LED 131. Control to do.

On the other hand, the light receiving amount acquisition unit 640 controls the PD 140 so as to receive light in synchronization with the light projection timing of each of the first LED 131 to the fourth LED 134. As a result, the light receiving amount acquisition unit 640 can acquire the light receiving amount of the infrared rays received by the PD 140 at the light projection timing of each of the first LED 131 to the fourth LED 134.

The Ir-LED control unit 520 and the light receiving amount acquisition unit 640 repeatedly execute these processes as one cycle. As a result, the display control unit 310 can constantly monitor whether or not an operation has been performed in the operation area while the display device 100 is being activated. The Ir-LED control unit 520 and the light receiving amount acquisition unit 640 repeat these processes, for example, with a repetition cycle of 10 [msec].

Returning to the description of FIG. The light receiving amount acquired by the light receiving amount acquisition unit 640 is notified to the correction unit 630. The correction unit 630 corrects the amount of light received when the first LED 131 is projected using the integrated value of the infrared liquid crystal transmittance in the first region. This is because the amount of infrared light transmitted through the first region is determined by the integrated value of the infrared liquid crystal transmittance in the first region.

Similarly, the correction unit 630 corrects the light receiving amount at the time of projecting the second LED 132 by using the integrated value of the liquid crystal transmittance of infrared rays in the second region. This is because the amount of infrared light transmitted through the second region is determined by the integrated value of the infrared liquid crystal transmittance in the second region. Similarly, the correction unit 630 corrects the light receiving amount at the time of projecting the third LED 133 by using the integrated value of the liquid crystal transmittance of infrared rays in the third region. This is because the amount of infrared light transmitted through the third region is determined by the integrated value of the infrared liquid crystal transmittance in the third region. Similarly, the correction unit 630 corrects the light receiving amount at the time of projecting the fourth LED 134 by using the integrated value of the liquid crystal transmittance of infrared rays in the fourth region. This is because the amount of infrared light transmitted through the fourth region is determined by the integrated value of the infrared liquid crystal transmittance in the fourth region.

In this way, the integrated value of the liquid crystal transmittance corresponding to the R value of the image data is calculated for each region corresponding to the position of the infrared LED, and the light receiving amount in each region is corrected. As a result, the light projection amount correction unit 910 can output the corrected light receiving amount excluding the influence of the change in the infrared transmittance (that is, the change in the infrared irradiation amount) due to the change in the R value of the image data. can.

<Flow of detection process>
Next, the flow of the detection process executed by the display device 100 will be described. FIG. 8 is a flowchart showing the flow of the detection process executed in the display device according to the first embodiment. When the display device 100 is activated, the flowchart shown in FIG. 8 is executed.

In step S801, the overall control unit 510 substitutes "1" for the LED counter n. In step S802, the Ir-LED control unit 520 projects light by controlling the nth LED, and the light receiving amount correction unit 550 acquires the light receiving amount based on the PD signal received by the PD 140.

In step S803, the light receiving amount correction unit 550 acquires the pixel value (R) of the image data in the nth region from the display unit 530, and calculates the integrated value of the liquid crystal transmittance. In step S804, the light receiving amount correction unit 550 corrects the acquired light receiving amount using the integrated value of the liquid crystal transmittance, and outputs the corrected light receiving amount.

In step S805, the detection unit 540 determines whether or not an operation has been performed in the operation area based on the corrected light receiving amount, and if it is determined that the operation has been performed, the detection result is determined by the overall control unit 510. Output to.

In step S806, the overall control unit 510 determines whether or not to end the detection process, and if it is determined not to end (if No in step S806), the process proceeds to step S807.

In step S807, the overall control unit 510 determines whether or not the LED counter n is "4". If it is determined in step S807 that the LED counter n is "4" (yes in step S807), the process proceeds to step S809, "1" is assigned to the LED counter n, and then step S802 is performed. return.

On the other hand, if it is determined in step S807 that the LED counter n is not "4" (No in step S807), the process proceeds to step S808, the LED counter n is incremented, and then the process returns to step S802.

On the other hand, if it is determined in step S806 to end (in the case of Yes in step S806), the detection process ends.

<Summary>
As is clear from the above description, the display device 100 according to the first embodiment is
-The operation area in front of the display area has the first LED to the fourth LED that emit infrared rays.
-The first LED to the fourth LED emit light in sequence, and the amount of infrared rays received by the PD at each light projection timing is acquired.
-When the first LED to the fourth LED sequentially project light, each pixel value (R value) of the image data displayed in the display area is acquired for each area corresponding to the position of the first LED to the fourth LED.
-Based on the acquired pixel value (R value) of each region, the integrated value of the liquid crystal transmittance is calculated for each region, and based on the calculated integrated value of the liquid crystal transmittance, the acquired infrared light receiving amount is calculated. Correct for each area.

As a result, according to the first embodiment, it is possible to correct the amount of infrared light received according to the change in the R value of the image data displayed in the display area, and the image data displayed in the display area can be corrected. It is possible to exclude the influence of the change in the infrared irradiation amount due to the change in the R value.

As a result, according to the first embodiment, the detection accuracy can be improved in the display device that detects the operation performed in the operation area in front of the display area.

[Second Embodiment]
In the first embodiment, a case where the amount of infrared rays received is corrected in order to exclude the influence of the change in the infrared irradiation amount due to the change in the R value of the image data displayed in the display area has been described. However, the method for excluding the influence of the change in the infrared irradiation amount due to the change in the R value of the image data displayed in the display area is not limited to this, and for example, it is configured to correct the infrared light projection amount. You may. Hereinafter, the second embodiment will be described focusing on the differences from the first embodiment.

<Functional configuration of display control unit>
First, the functional configuration of the display control unit in the display device according to the second embodiment will be described. FIG. 9 is a diagram showing an example of the functional configuration of the display control unit in the display device according to the second embodiment. The difference from FIG. 5 is that in the case of the display control unit 900, the display control unit 900 has a light projection amount correction unit 910, an Ir-LED control unit 920, and a light receiving amount acquisition unit 930.

The floodlight correction unit 910 notifies the Ir-LED control unit 920 of the control signal output from the overall control unit 510. Further, the light projection amount correction unit 910 calculates the light projection amount of the first LED 131 to the fourth LED 134 based on the pixel value notified from the display unit 530, and notifies the Ir-LED control unit 920.

The Ir-LED control unit 920 determines the light projection timing and the light projection amount of the first LED 131 to the fourth LED 134 based on the control signal notified by the light projection amount correction unit 910 and the light projection amount notified by the light projection amount correction unit 910. Control. Further, the Ir-LED control unit 920 notifies the light receiving amount acquisition unit 930 of the control signal notified by the light projection amount correction unit 910.

The light receiving amount acquisition unit 930 acquires the PD signal received by the PD 140 via the signal input device 405 based on the control signal notified from the Ir-LED control unit 920. Further, the light receiving amount acquisition unit 930 notifies the detection unit 540 of the light receiving amount indicated by the acquired PD signal.

<Details of the functional configuration of the light projection correction unit>
Next, the details of the functional configuration of the light projection amount correction unit 910 will be described. FIG. 10 is a diagram showing details of the functional configuration of the light projection amount correction unit. As shown in FIG. 10, the projection amount correction unit 910 includes a selection unit 1010, a transmittance integration unit 1020, and a correction unit 1030.

The selection unit 1010 divides the R value notified from the display unit 530 into the first region to the fourth region, and sequentially acquires the R value. As shown in FIG. 10, the display area provided by the liquid crystal device 110 is divided into four areas (first area to fourth area) according to the positions of the first LED 131 to the fourth LED 134. Therefore, the selection unit 1010 first acquires the pixel value (R value) of the image data displayed in the first area among the image data displayed in the display area as the first area pixel value (R). Notify the transmittance integrating unit 1020.

Subsequently, the selection unit 1010 acquires the pixel value (R value) of the image data displayed in the second area among the image data displayed in the display area as the second area pixel value (R), and transmits the image data. Notify the rate integration unit 1020.

Subsequently, the selection unit 1010 acquires the pixel value (R value) of the image data displayed in the third area among the image data displayed in the display area as the third area pixel value (R), and transmits the image data. Notify the rate integration unit 1020.

Subsequently, the selection unit 1010 acquires the pixel value (R value) of the image data displayed in the fourth area among the image data displayed in the display area as the fourth area pixel value (R), and transmits the image data. Notify the rate integration unit 1020.

The transmittance integrating unit 1020 calculates the liquid crystal deflection degree in the first region based on the first region pixel value (R) notified by the selection unit 1010. This makes it possible to calculate the integrated value of the infrared liquid crystal transmittance in the first region. Similarly, the transmittance integrating unit 1020 calculates the liquid crystal deflection degree in the second region based on the second region pixel value (R) notified by the selection unit 1010. This makes it possible to calculate the integrated value of the infrared liquid crystal transmittance in the second region.

Similarly, the transmittance integrating unit 1020 calculates the liquid crystal deflection degree in the third region based on the third region pixel value (R) notified by the selection unit 1010. This makes it possible to calculate the integrated value of the infrared liquid crystal transmittance in the third region. Similarly, the transmittance integrating unit 1020 calculates the liquid crystal deflection degree in the fourth region based on the fourth region pixel value (R) notified by the selection unit 1010. This makes it possible to calculate the integrated value of the infrared liquid crystal transmittance in the fourth region.

The correction unit 1030 corrects the amount of light projected when the first LED 131 is flooded by using the integrated value of the liquid crystal transmittance of infrared rays in the first region. This is because the amount of infrared light transmitted through the first region is determined by the integrated value of the infrared liquid crystal transmittance in the first region.

Similarly, the correction unit 1030 corrects the amount of light projected when the second LED 132 is projected using the integrated value of the liquid crystal transmittance of infrared rays in the second region. This is because the amount of infrared light transmitted through the second region is determined by the integrated value of the infrared liquid crystal transmittance in the second region. Similarly, the correction unit 1030 corrects the amount of light projected at the time of projecting the third LED 133 by using the integrated value of the liquid crystal transmittance of infrared rays in the third region. This is because the amount of infrared light transmitted through the third region is determined by the integrated value of the infrared liquid crystal transmittance in the third region. Similarly, the correction unit 1030 corrects the amount of light projected at the time of projecting the fourth LED 134 by using the integrated value of the liquid crystal transmittance of infrared rays in the fourth region. This is because the amount of infrared light transmitted through the fourth region is determined by the integrated value of the infrared liquid crystal transmittance in the fourth region.

In this way, the integrated value of the liquid crystal transmittance corresponding to the R value of the image data is calculated for each region corresponding to the position of the infrared LED, and the amount of light projected in each region is corrected. As a result, the light projection correction unit 910 can output the corrected light projection amount, which eliminates the influence of the change in the infrared transmittance (that is, the change in the infrared irradiation amount) due to the change in the R value of the image data. can.

<Flow of detection process>
Next, the flow of the detection process executed by the display device 100 will be described. FIG. 11 is a flowchart showing the flow of the detection process executed in the display device according to the second embodiment. The difference from the detection process described with reference to FIG. 8 is in steps S1101 to S1104.

In step S1101, the floodlight correction unit 910 acquires the pixel value (R) of the image data in the nth region from the display unit 530 and calculates the integrated value of the liquid crystal transmittance. In step S1102, the light projection amount correction unit 910 corrects the default light projection amount by using the integrated value of the liquid crystal transmittance, and outputs the corrected light projection amount.

In step S1103, the Ir-LED control unit 920 performs light projection by controlling the nth LED with the calculated light projection amount, and the light reception amount acquisition unit 930 receives light light based on the PD signal received by the PD 140. To get.

In step S1104, the detection unit 540 determines whether or not an operation has been performed in the operation area based on the acquired light receiving amount, and if it is determined that the operation has been performed, the detection result is determined by the overall control unit 510. Output to.

<Summary>
As is clear from the above description, the display device 100 according to the second embodiment is
-The operation area in front of the display area has the first LED to the fourth LED that emit infrared rays.
-The first LED to the fourth LED emit light in sequence, and the amount of infrared rays received by the PD at each light projection timing is acquired.
-When the first LED to the fourth LED sequentially project light, each pixel value (R value) of the image data to be displayed in the display area is acquired for each area corresponding to the position of the first LED to the fourth LED.
-Based on the acquired pixel value (R value) of each area, the integrated value of the liquid crystal transmittance is calculated for each area, and based on the calculated integrated value of the liquid crystal transmittance, the first LED to the fourth LED are flooded. Correct the amount of light projected.

As a result, according to the second embodiment, it is possible to correct the amount of infrared light projected according to the change in the R value of the image data displayed in the display area, and the image data displayed in the display area can be corrected. It is possible to exclude the influence of the change in the infrared irradiation amount due to the change in the R value.

As a result, according to the second embodiment, the detection accuracy can be improved in the display device that detects the operation performed in the operation area in front of the display area.

[Other embodiments]
In the first and second embodiments described above, it is configured to determine whether or not an operation has been performed in the operation area for each repetition cycle, but this is the method for determining whether or not an operation has been performed in the operation area. Not limited. For example, it is configured to comprehensively determine whether or not an operation has been performed in the operation area based on the amount of received infrared light reflected at the projection timing of each infrared LED for a plurality of repetition cycles. You may.

Further, in the first and second embodiments, the display device 100 is configured to arrange four infrared LEDs of the first LED 131 to the fourth LED 134. However, the number of infrared LEDs is not limited to this, and any number may be used as long as there are a plurality of infrared LEDs. In this case, the selection units 610 and 1010 sequentially acquire the pixel values (R values) of the image data belonging to each of the number of regions corresponding to the number of infrared LEDs. Further, the position to be arranged is not limited to the position shown in FIG.

Further, in the first and second embodiments described above, the display device 100 has been described as being integrally configured, but the display device 100 may be configured by a plurality of devices. For example, in the display device 100, the control device 300 and the liquid crystal device 110 (and the first LED 131 to the fourth LED 134, PD 140) may be configured as separate bodies.

Further, in the first and second embodiments, the display device 100 has been described as being mounted on a vehicle, but it may be mounted on a moving body other than the vehicle or equipment other than the moving body.

The present invention is not limited to the configurations shown here, such as combinations with other elements in the configurations and the like described in the above embodiments. These points can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form thereof.

100: Display device 110: Liquid crystal device 131 to 134: 1st to 4th LEDs
140: PD
200: Light guide plate 300: Control device 310: Display control unit 510: Overall control unit 520: Ir-LED control unit 530: Display unit 540: Detection unit 550: Light receiving amount correction unit 610: Selector unit 620: Transmittance integration unit 630 : Correction unit 640: Light receiving amount acquisition unit 910: Light projection amount correction unit 920: Ir-LED control unit 930: Light receiving amount acquisition unit 1010: Selection unit 1020: Transmittance integration unit 1030: Correction unit

Claims (4)

A floodlight that transmits infrared rays to the operation area in front of the LCD through the R filter in the display area of the liquid crystal display.
A receiver that receives the reflected light when the floodlight is projected, and a receiver that receives the reflected light.
From the liquid crystal deflection degree calculated based on the R value of each pixel of the image data displayed in the liquid crystal display area, the integrated value of the infrared liquid crystal transmittance is calculated, and the amount of infrared light projected by the floodlight, or A display device comprising a correction unit that corrects the amount of reflected light received by the light receiver by using the integrated value of the liquid crystal transmittance of the infrared rays . The correction unit
From the liquid crystal deflection degree calculated based on the R value of each pixel of the image data displayed in the area corresponding to the position of the plurality of floodlights in the display area, the integrated value of the infrared liquid crystal transmittance is calculated. It is characterized in that each is calculated and the amount of infrared light emitted by the plurality of floodlights or the amount of reflected light received by the light receiver is corrected by using the integrated value of the corresponding infrared liquid crystal transmittance. The display device according to claim 1 . The amount of reflected light received by the light receiver when the floodlight was projected with the corrected light amount, or the amount of reflected light received by the light receiver when the light projector was projected was corrected. The display device according to claim 1 or 2 , further comprising a detection unit that detects whether or not an operation has been performed in the operation area based on the corrected light amount. A floodlight that transmits infrared rays to the operation area in front of the LCD through the R filter in the display area of the liquid crystal display.
A receiver that receives the reflected light when the floodlight is projected, and a receiver that receives the reflected light.
It is a correction method in a display device having
From the liquid crystal deflection degree calculated based on the R value of each pixel of the image data displayed in the liquid crystal display area, the integrated value of the infrared liquid crystal transmittance is calculated, and the amount of infrared light projected by the floodlight, or A correction method comprising correcting the amount of reflected light received by the light receiver by using the integrated value of the liquid crystal transmittance of the infrared rays .

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