JP2016192760A - Display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid erroneous detection of a body to be detected, even if ambient light including infrared light in sunlight is received.SOLUTION: A display unit includes: a proximity sensor part, having a light detection unit 1 having a light emitting element 2 and a light reception element 3, a detection signal processing part 5 for detecting a body 4 to be detected on the basis of a detection signal of the light reception element 3, and a detection control part 6 which alternatively repeats a first detection state in which the light emitting element 2 is in light emitting state and the light reception element 3 is in light reception state, and a second detection state in which the light emitting element 2 is in non-light-emitting state and the light reception element 3 is in light reception state for receiving ambient light; and a display part for changing display state if proximity of body to be detected 4 is detected by the proximity sensor part. Proximity or non-proximity of the body to be detected 4 is detected by obtaining a second difference Δ2 between a signal, in which a fluctuation component 11a of an ambient light signal obtained from ambient light 7 at the second detection state and a reference signal 12 at the first detection state are superposed, and a detection signal 11, and by comparing the second difference Δ2 and a threshold value.SELECTED DRAWING: Figure 3

Description

  The present invention provides a display device having a proximity sensor unit that detects the proximity of an object to be detected such as a human finger with light such as infrared rays, and in particular, activates a screen display when a human finger or the like approaches. The present invention relates to a display device that performs display driving such as displaying a hidden display portion such as an icon or a touch button, an operation portion, or switching a still image display to a moving image display.

  2. Description of the Related Art Conventionally, in a liquid crystal display (LCD) used for, for example, an automobile navigation system, a tablet terminal, and a smartphone, a human finger is close to a display surface in order to operate a touch panel provided on the LCD. Sometimes the proximity sensor unit is used to drive the display, such as activating screen display, displaying hidden display parts such as icons and touch buttons, operation parts on the display surface, or switching still image display to video display. May be provided. Examples of the proximity sensor device include a capacitive proximity sensor device, an inductance proximity sensor device, and an infrared proximity sensor device.

  An example of an LCD provided with an infrared proximity sensor device is shown in FIGS. Note that the LCD shown in FIGS. 6A and 6B has a configuration previously filed by the applicant of the present application (Japanese Patent Application No. 2014-57418). 6A is a front view of the LCD, and FIG. 6B is a cross-sectional view of the LCD. The LCD includes a liquid crystal display panel 22 in which infrared detection units 26 for detecting a detection object 29 such as a human finger close to the display surface 22a are provided on both left and right sides, and glass that covers the display surface 22a and the infrared detection unit 26. A transparent member 21 made of a plate, a plastic plate or the like, a frame 23 made of plastic or the like having an opening for fitting the liquid crystal display panel 22, and a plastic provided on the side opposite to the display surface 22b of the liquid crystal display panel 22 And a protective member 25. The infrared detection unit 26 includes an infrared light receiving element 26b and an infrared light emitting element 26a having a larger number than the infrared light receiving element 26b, and the infrared light emitting element 26a is tilted so as to face the normal h direction at the center of the display surface 22a. Installed. With this configuration, EMI (Electromagnetic Interference) is not generated in surrounding electronic components and circuit wiring, and conversely, EMI is not received from surrounding electronic components and circuit wiring, and the display surface 22a of the liquid crystal display panel 22 is not affected. It is possible to satisfactorily detect the detected body 29 such as a human hand that is in the lateral direction away from the installation position of the infrared detection unit 26 in the vicinity of the central portion.

  Although the infrared detection unit 26 is covered with the transparent member 21, the portion of the transparent member 21 covering the infrared detection unit 26 is, for example, a light-shielding layer having a shade of black or the like that transmits infrared light but does not transmit visible light. The member is provided, and the portion corresponding to the display surface 22a of the transparent member 21 is transparent for allowing visible light to pass through. In addition, the infrared detection unit 26 is installed on a protruding member 28 attached to the end of the non-display surface 22b of the liquid crystal display panel 22 by means such as bonding with an adhesive or screwing. The projecting member 28 is attached to the non-display surface 22b of the liquid crystal display panel 22 by a double-sided adhesive tape such as a transparent adhesive or a highly transparent adhesive transfer tape (OCA). Further, the projecting member 28 has, for example, a portion projecting from the non-display surface 22b of the liquid crystal display panel 22 inclined toward the center of the display surface 22a, and the infrared detection unit 26 is installed at the site. . Further, as shown in FIG. 6B, from the viewer side, the transparent member 21, the liquid crystal display panel 22, the frame body 23 having an opening for fitting the liquid crystal display panel 22, the backlight 24, and the backlight 24 fixing A metal frame 24a made of aluminum or the like and a protective member 25 are disposed. The metal frame 24a is fitted into the frame 23 and fixed by means such as screws, and the protection member 25 is fixed to the frame 23 by means such as screws. Reference numeral 27 denotes a grounding conductor plate made of aluminum (Al) or the like provided on the main surface of the backlight 24 opposite to the liquid crystal display panel 22.

  The infrared radiation direction of the infrared light emitting element 26a is a predetermined angle range including an angle θ formed by the radiation axis (radiation central axis) Ac, the display surface 22a, and the outer main surface of the transparent member 21, including 45 °. It is configured to be able to effectively detect a detection object 29 such as a person's hand that is located laterally away from the installation position of the infrared detection unit 26 at a certain distance (about 10 cm) from the center of the display surface 22a. ing.

  In addition, as an example of a conventional detection device using light in the near infrared wavelength region, there is one disclosed in Patent Document 1, and an object such as a human face is detected using light in the near infrared wavelength region. A part discriminating device and a gender judging device for an object to be discriminated have been proposed. This device irradiates the object with light in the near-infrared wavelength region, and captures the pixel value of the image of the object imaged in the state illuminated with light in the near-infrared wavelength region and the light is not irradiated. By calculating the difference from the pixel value of the image of the target object, the influence of ambient light is removed. Then, based on the calculated difference, each part of the object, for example, the driver's skin, hair, and eyeballs, is discriminated to detect the face area, and a part of the face area, for example, a wrinkle pixel between the nose and mouth The occupancy rate of the pixel having the value is obtained, and the sex is determined from the result. That is, by calculating the difference between the detected value obtained when the object is illuminated with light in the near-infrared wavelength region and the non-irradiated detected value obtained when the object is not irradiated with light, This removes the influence of ambient light such as ambient light.

JP 2008-27242 A

  However, in a detection device that eliminates the influence of ambient light such as ambient light by calculating the difference between the detection value during irradiation and the detection value during non-irradiation, a very bright environment such as direct sunlight When light enters the infrared receiving element and is received, even if the reflected infrared ray from the detected object is also received at the same time, the reflected infrared ray has only an intensity of about several percent of the infrared ray emitted from the infrared light emitting element 26a. In some cases, the reflected infrared detection signal is buried in the ambient light environment detection signal, making it difficult to detect the detection target.

  Therefore, in order to reliably detect the reflected infrared rays from the detected object 29, a detection signal obtained by converting the reflected infrared rays into an electrical signal by the infrared light receiving element 26b and a reference signal (base) obtained by delaying the detection signal by a predetermined time. It is possible to adopt a method of calculating a difference from a signal) and comparing the difference with a predetermined threshold. However, even if there is no object to be detected such as a human finger in front of the display device, if ambient light including infrared rays such as sunlight is received by the infrared light receiving element 26b, the ambient light is bright. For example, as shown in FIG. 7A, a large detection signal 31 similar to the case where the detected object 29 is detected is obtained. When the difference ΔSa between the detection signal 31 and the reference signal 32 obtained by delaying the detection signal 31 is taken, erroneous detection as if the detected object 29 was detected occurred. Similarly, even when there is no detection object 29 such as a human finger in front of the display device, if the ambient light is slightly dark such as repeating light and dark, for example, moving in the shade in fine weather. In this case, a pulsating detection signal 33 as shown in FIG. When the difference ΔSb between the detection signal 33 and the reference signal 34 obtained by delaying the detection signal 33 is taken, erroneous detection as if the detected object 29 was detected occurred.

  Therefore, the present invention has been completed in view of the above-mentioned conventional problems, and its purpose is to detect a detection object erroneously even when ambient light including infrared rays of sunlight is received. To provide a display device having a proximity sensor unit that can be prevented.

The display device of the present invention includes a light detection unit having a light emitting element and a light receiving element, a detection signal processing unit that detects the proximity of the detected object based on a detection signal of the light receiving element, and the light emitting element in a light emitting state. And a first detection state in which the light receiving element is in a light receiving state and a second detection state in which the light emitting element is in a non-light emitting state and the light receiving element is in a light receiving state in order to receive ambient light. A proximity control unit having a detection control unit that controls to repeat
A display unit that changes a display state when the proximity sensor unit detects the proximity of the detected object,
The detection signal processing unit takes a first difference between the detection signal and a reference signal in the first detection state, and calculates a variation component of the environment light signal acquired from the environment light in the second detection state. The proximity or non-proximity of the detected object is detected by taking a second difference with the detection signal superimposed on the reference signal in the first detection state and comparing the second difference with a threshold value. It is the structure to do.

  In the display device of the present invention, it is preferable that the reference signal is a delayed signal obtained by delaying the detection signal by 100 msec to 500 msec.

  In the display device according to the aspect of the invention, it is preferable that the fluctuation component includes the environmental light signal acquired when the environmental light is detected in the second detection state, and the environmental light in the second detection state. Is a difference signal from the non-detection time signal acquired when the signal is not detected.

  In the display device of the present invention, preferably, when the ambient light includes infrared rays, the light emitting element emits infrared rays, and the light receiving element detects infrared rays.

The display device of the present invention includes a light detection unit having a light emitting element and a light receiving element, a detection signal processing unit for detecting the proximity of a detection object based on a detection signal of the light receiving element, and a light receiving element that is in a light emitting state and receives light. Control is performed to alternately repeat a first detection state in which the element is in a light receiving state and a second detection state in which the light receiving element is in a light receiving state in order to receive ambient light while the light emitting element is in a non-light emitting state. A proximity control unit having a detection control unit;
A display unit that changes a display state when the proximity sensor unit detects the proximity of an object to be detected;
The detection signal processing unit takes a first difference between the detection signal and the reference signal in the first detection state, and calculates a fluctuation component of the environmental light signal acquired from the environmental light in the second detection state in the first detection state. Since it is the structure which detects the proximity | contact or non-proximity of a to-be-detected body by taking the 2nd difference with a detection signal superimposed on the reference signal in and comparing the 2nd difference and a threshold value, The effect is produced. That is, in the second detection state, since the light emitting element is in a non-light emission state, a detection signal should not be obtained even if the detection target exists in the detectable region space. When the ambient light is received in the second detection state, an ambient light signal as an erroneous signal is generated in the first and second detection states as if the detected object is detected. Then, when the fluctuation component of the ambient light signal with respect to the non-detection signal is superimposed on the reference signal in the first detection state to obtain the second difference from the detection signal, the environment is detected when the detected object is not in proximity, for example. Even if light is received, the second difference becomes smaller than the threshold value, and the influence of the environmental light signal can be eliminated.

  In the display device of the present invention, when the reference signal is a delayed signal obtained by delaying the detection signal by 100 msec to 500 msec, the proximity of the detection object is detected by the second difference between the detection signal and the reference signal and the threshold value. It is suitable for.

  In the display device of the present invention, the fluctuation component is acquired when the ambient light is detected in the second detection state and when the ambient light is not detected in the second detection state. If the signal is a difference signal from the detection signal, the fluctuation component can be reliably extracted.

  In the display device of the present invention, when the ambient light includes infrared rays, the light emitting element emits infrared rays, and when the light receiving element detects infrared rays, the influence of sunlight including infrared rays is eliminated, False detection can be prevented. That is, the proximity sensor unit can detect a human hand or the like that is a good reflector of infrared rays, and can eliminate the influence of sunlight, illumination light, and the like that cause the largest ambient light signal.

1A and 1B show an example of an embodiment of a proximity sensor unit in a display device of the present invention. FIG. 1A is a block diagram of a basic configuration of the proximity sensor unit, and FIG. These are timing charts showing the light emission timing of the light emitting element and the light reception timing of the light receiving element in the light detection unit. FIG. 2 shows another example of the embodiment of the proximity sensor unit in the display device of the present invention, and is a timing chart showing the light emission timing of the light emitting element and the light reception timing of the light receiving element for two light detection units. FIGS. 3A to 3C show another example of the embodiment of the proximity sensor unit in the display device of the present invention. FIG. 3A shows the detection signal and the reference signal in the first detection state. The graph which shows taking a 1st difference, (b) is a graph which shows the fluctuation component of the environmental light signal detected in the 2nd detection state, (c) is the fluctuation component of the environmental light signal in the 1st detection state It is a graph which shows superimposing on a reference signal and taking a 2nd difference with a detection signal. 4A to 4C show other examples of the embodiment of the proximity sensor unit in the display device of the present invention. FIG. 4A shows the detection signal and the reference signal in the first detection state. The graph which shows taking a 1st difference, (b) is a graph which shows the fluctuation component of the environmental light signal detected in the 2nd detection state, (c) is the fluctuation component of the environmental light signal in the 1st detection state It is a graph which shows superimposing on a reference signal and taking a 2nd difference with a detection signal. FIGS. 5A to 5C show other examples of the embodiment of the proximity sensor unit in the display device of the present invention. FIG. 5A shows the detection signal and the reference signal in the first detection state. The graph which shows taking a 1st difference, (b) is a graph which shows the fluctuation component of the environmental light signal detected in the 2nd detection state, (c) is the fluctuation component of the environmental light signal in the 1st detection state It is a graph which shows superimposing on a reference signal and taking a 2nd difference with a detection signal. 6A and 6B show a liquid crystal display device provided with a conventional infrared proximity sensor device, where FIG. 6A is a front view of the liquid crystal display device, and FIG. 6B is a cross-sectional view of the liquid crystal display device. It is. FIGS. 7A and 7B show detection signals obtained by a conventional infrared proximity sensor device. FIG. 7A shows detection signals and reference signals when bright ambient light is received by the infrared light receiving element. (B) is a graph showing that the difference between the detection signal and the reference signal is taken when ambient light that repeats bright and dark is received by the infrared light receiving element.

  Embodiments of a display device of the present invention will be described below with reference to the drawings. However, each drawing referred to below shows main components of the display device of the present invention. Therefore, the display device of the present invention may include well-known components such as a circuit board, a wiring conductor, a control IC, and an LSI that are not shown in the drawing.

  1 to 5 show various examples of embodiments of the proximity sensor unit in the display device of the present invention. As shown in these drawings, the proximity sensor unit in the display device of the present invention is a light emitting element. 2 and the light detection unit 1 based on the detection signal of the light receiving element 3 that receives the reflected light of the detection target 4 that reflects the light emitted from the light emitting element 2. Detection signal processing unit 5 to detect, a first detection state in which light emitting element 2 is in a light emitting state and light receiving element 3 is in a light receiving state, and light emitting element 2 in a non-light emitting state and for receiving ambient light When the proximity of the detected object 4 is detected by the proximity sensor unit having a detection control unit 6 that controls the light receiving element 3 to alternately repeat the second detection state that is the light receiving state. The display state is changed The detection signal processing unit 5 takes the first difference ΔS1 between the detection signal 11 and the reference signal 12 in the first detection state and the environment in the second detection state. The fluctuation component 11a (13a) of the ambient light signal acquired from the light 7 is superimposed on the reference signal 12 in the first detection state to obtain a second difference ΔS2 from the detection signal 11, and the second difference ΔS2 In this configuration, the proximity or non-proximity of the detection object 4 is detected by comparing the threshold. With this configuration, the following effects can be obtained. That is, in the second detection state, since the light-emitting element 2 is in the non-light-emitting state, the detection signal 11 (13) can be obtained regardless of whether the detection object 4 is present in the detectable region space. Although it should not exist, when the ambient light 7 is received in the second detection state, the ambient light signal as an erroneous signal as if the detected object 4 was detected is detected in the first and second detection states. Occur. Then, when the fluctuation component 11a (13a) of the ambient light signal with respect to the non-detection signal is superimposed on the reference signal 12 (14) in the first detection state, the second difference ΔS2 from the detection signal 11 (13) is obtained. For example, even when the ambient light 7 is received when the detection object 4 is not in proximity, the second difference ΔS2 becomes smaller than the threshold value, and the influence of the ambient light signal can be eliminated.

  In the proximity sensor portion of the display device of the present invention, the light emitting element 2 is composed of an infrared light emitting diode (IR-LED) or the like, and the light receiving element 3 is composed of a photodiode (PD) or the like. The light emitting element 2 has a drive current of, for example, 200 mA when emitting light, and a drive current of, for example, 0 mA when not emitting light. As shown in FIG. 1B, the light emitting element 2 is driven at 200 mA in the first detection state, and the light emitting element 2 is driven at 0 mA in the second detection state. The light emission period and the non-light emission period of the light emitting element 2 are each set to about 8 msec (milliseconds). The light receiving period of the light receiving element 3 is also set to about 8 msec in synchronization with the light emitting period and the non-light emitting period of the light emitting element 2. The reference signal (base signal) 12 (14), which is a delayed signal obtained by delaying the detection signal 11 (13) for a predetermined time, is preferably about 100 msec (milliseconds) to about 500 msec. Generated with a delay. In this case, it becomes suitable for detecting the proximity of the detection object 4 based on the first difference ΔS1, the second difference ΔS2, and the threshold value between the detection signal 11 (13) and the reference signal 12 (14). That is, the time during which the detection object 4 such as a human hand approaches the proximity region such as the display surface of the display device is about 100 msec to 500 msec, which corresponds to the rising portion of the detection signal 11. When the first difference ΔS1 and the second difference ΔS2 between the detection signal 11 and the reference signal 12 are taken between about 100 msec to 500 msec, the first difference ΔS1 and the second difference ΔS2 are increased. Can do. In addition, the signal after the rising portion of the detection signal 11 often has a state where the detection object 4 is close to the proximity region for a long time, and therefore does not change or tends to be small like the rising portion. More preferably, it is about 200 msec to about 300 msec. Further, if the detected object 4 is in the vicinity of the detection limit, for example, the LCD shown in FIG. 6, the second difference ΔS <b> 2 when the detected object 4 is located about 10 cm away from the outer surface of the transparent member 21 in the direction perpendicular thereto. The signal level can be set to the same level as the threshold value.

  Further, the first difference ΔS1 and the second difference ΔS2 are always taken, and it is determined that the detected object 4 exists in the detectable region space at the moment when the second difference ΔS2 exceeds the threshold value.

  The first detection state is for detecting the detected object 4. When the detected object 4 does not exist in the detectable area space and there is no ambient light 7 (case 1), the light receiving element 3 is The light is not received and the detection signal and the ambient light signal cannot be obtained. When the detected object 4 is present in the detectable region space and there is no ambient light 7 (case 2), the reflected light of the detected object 4 is received by the light receiving element 3 and a detection signal is obtained. When the detected object 4 does not exist in the detectable area space and there is ambient light 7 (case 3), the light receiving element 3 receives the ambient light 7 and obtains an ambient light signal. In addition, when the detected object 4 is present in the detectable region space and there is ambient light 7 (case 4), a detection signal and an ambient light signal by reflected light of the detected object 4 are obtained.

  The second detection state is for detecting (sampling) the ambient light signal, and it does not matter whether or not the detected object 4 is present in the detectable region space. When there is no ambient light 7 (cases 1 and 2), an ambient light signal is not obtained and a signal of almost 0 level is obtained. When there is ambient light 7 (cases 3 and 4), an ambient light signal is obtained.

  In case 1, there is no detection signal 11 in the first detection state shown in FIG. 3A, and there is no fluctuation component 11a of the ambient light signal in the second detection state shown in FIG. It can be specified that the detection object 4 does not exist in the detectable region space.

  In case 2, there is a detection signal 11 in the first detection state shown in FIG. 3A, and there is no fluctuation component 11a of the ambient light signal in the second detection state shown in FIG. A first difference ΔS1 having a signal level greater than the threshold shown in FIG. 3A is obtained, and the second difference ΔS2 is the same as the first difference ΔS1. As a result, it can be specified that the detected object 4 exists in the detectable region space.

  In case 3, when the ambient light is bright light such as direct sunlight, an ambient light signal similar to the detection signal 11 in the first detection state shown in FIG. When the ambient light repeats bright and dark, an ambient light signal similar to the pulsation type detection signal 13 in the first detection state shown in FIG. Further, when the ambient light is bright, there is a fluctuation component 11a of the ambient light signal in the second detection state shown in FIG. 3B, and when the ambient light repeats bright and dark, the second component shown in FIG. There is a fluctuation component 13a of the pulsating ambient light signal in the detection state. When the ambient light is bright, the second difference ΔS2 between the detection signal 11 (environmental light signal) shown in FIG. 3C and the reference signal 12a obtained by superimposing the fluctuation component 11a of the ambient light signal on the reference signal 12 is obtained. As a result, the second difference ΔS2 has a signal level smaller than the threshold value, so that it can be specified that the detection object 4 does not exist in the detectable region space. When the ambient light repeats bright and dark, the pulsation type detection signal 13 (environmental light signal) and the fluctuation component 13a of the pulsation type ambient light signal are superimposed on the reference signal 14 as shown in FIG. Since the second difference ΔS2 from the reference signal 14a is obtained and the second difference ΔS2 has a signal level smaller than the threshold value, it can be specified that the detected object 4 does not exist in the detectable region space.

  In case 4, when the ambient light is bright, a signal obtained by adding the ambient light signal having the same waveform to the detection signal 11 in the first detection state shown in FIG. 3A is obtained. In the case of repetition, a signal obtained by adding the pulsation type ambient light signal shown in FIG. 4A to the detection signal 11 in the first detection state shown in FIG. 3A, that is, the detection signal 15 shown in FIG. Is obtained. When the ambient light is bright, there is a fluctuation component 11a of the ambient light signal in the second detection state shown in FIG. 3B, and when the ambient light repeats bright and dark, the second light shown in FIG. There is a fluctuation component 15a of the pulsating ambient light signal in the detection state. When the ambient light is bright, a reference signal 12a in which a signal obtained by adding an ambient light signal having the same waveform to the detection signal 11 shown in FIG. The second difference ΔS2 is obtained, and the second difference ΔS2 has a signal level larger than the threshold value. Therefore, it can be specified that the detected object 4 exists in the detectable region space. When the ambient light repeats bright and dark, as shown in FIG. 5C, a signal obtained by adding the pulsating ambient light signal shown in FIG. 4A to the detection signal 11 shown in FIG. A second difference ΔS2 is obtained from the reference signal 16a obtained by superimposing the fluctuation component 15a of the pulsating type ambient light signal shown in FIG. 5B on the reference signal 16, and the second difference ΔS2 is a signal level larger than the threshold value. Therefore, it can be specified that the detected object 4 exists in the detectable region space.

  The embodiment of the present invention will be summarized below. First, the detection signal of the light receiving element 3 in the first detection state is PS (1), the detection signal of the light receiving element 3 in the second detection state is PS (2), and the fluctuation component of PS (2) (the ambient light signal) Let ΔPS (2) be the fluctuation component relative to the non-detection signal, and BS (1) be the reference signal. For example, ΔPS (2) can be obtained by taking the average value of PS (2) over a certain period and taking the difference between the average value of a certain period and the average value of the previous period. Then, a noise superposition reference signal BSP (2) in which ΔPS (2) is superimposed on BS (1) is generated, and a second difference ΔS2 between PS (1) and BSP (2) is taken. When the threshold is Pth, if PS (1) −BSP (2) = ΔS2> Pth, it is determined that the detected object 4 is close and in the detectable region space. If ΔS2 ≦ Pth, it is determined that the detection object 4 is not close and is not in the detectable region space. In the case of the LCD shown in FIG. 6, the detectable area space corresponds to a space from the outer surface of the transparent member 21 to a position about 10 cm away in the direction perpendicular thereto. Therefore, the threshold value Pth corresponds to a signal level when light having an illuminance of about 20 lx (lux) is received. In the case of the LCD shown in FIG. 6, the threshold value Pth is about 10 cm in the direction perpendicular to the outer surface of the transparent member 21. This is the detection signal level when the detected object 4 such as a human hand is located at a distant position.

  In addition, when there are two light detection units as shown in FIG. 6A, when one light detection unit is in the first detection state as shown in FIG. It is preferable to control the detection state. In this case, the light emitted from the light emitting element 2a (2b) of one light detection unit is not easily received by the light receiving element 3b (3a) of the other light detection unit, and the detection accuracy of each light detection unit is high. Can be maintained.

  The ambient light 7 may be any light that can be detected by the light receiving element 3, for example, visible light having a wavelength of about 400 nm to about 750 nm, and infrared light having a wavelength of about 750 nm to about 1400 nm. Near infrared. The ambient light 7 may include light of various wavelengths and frequencies such as ultraviolet light, visible light, and infrared light. Among them, a proximity sensor unit that detects the infrared light by the light receiving element 3 or a visible light receiving element. As the proximity sensor unit or the like detected by 3, various detection forms can be adopted. In the proximity sensor unit of the display device of the present invention, when the ambient light 7 includes infrared rays, it is preferable that the light emitting element 2 emits infrared rays and the light receiving element 3 detects infrared rays. In this case, the influence of ambient light 7 such as sunlight including infrared rays can be eliminated, and erroneous detection of the detection object 4 can be prevented. That is, the proximity sensor unit can detect a human hand or the like which is a good reflector of infrared rays, and can eliminate the influence of ambient light 7 such as sunlight and illumination light that causes the largest ambient light signal. it can. As infrared rays, near infrared rays having a wavelength of about 750 nm to 1400 nm are preferable because they are easily reflected by human hands.

  Similar to the configuration shown in FIG. 6, the display device of the present invention includes the proximity sensor unit, and preferably a plurality of light detection units 1 are arranged around a display surface (for example, a display surface of an LCD) as a display unit. Are provided at intervals. With this configuration, erroneous detection of the detection target 4 can be prevented, the detection sensitivity of the detection target 4 can be improved, and the position of the detection target 4 can be accurately identified. For example, it is preferable that the light detection unit 1 is around the display surface 22a and at both left and right ends thereof, and they are in symmetrical positions with respect to the vertical center line of the display surface 22a. In this case, it is advantageous to specify the position in the horizontal direction of the display surface 22a of the detection object 4. Further, it is preferable that the light detection unit 1 is around the display surface 22a and at both left and right ends thereof, and at least one of the upper and lower ends. In this case, it is advantageous to specify the position of the detection object 4 in the plane of the display surface 22a.

  Further, the display device of the present invention includes the proximity sensor unit, so that the display state of the display surface can be changed when a human finger or the like approaches the display surface and detects it. For example, the screen display is activated, the display part such as icons and touch buttons that are normally hidden on the display surface, the operation part is displayed, the still image display is switched to the video display, or the screen display is set to a plurality of screen displays. Such display driving can be performed. Furthermore, operation parts such as icons and touch buttons can be displayed in a space in front of the display surface by using a hologram or the like.

  As an example of the display device, there is an LCD shown in FIG. 6, and the LCD has the following configuration. In an LCD, an array side substrate composed of a glass substrate or the like on which a large number of pixel portions including TFTs are formed and a color filter side substrate composed of a glass substrate or the like on which a color filter and a black matrix are formed are opposed to each other. It is manufactured by bonding substrates at a predetermined interval and filling and sealing liquid crystal between the substrates. In general, the color filter side substrate is a liquid crystal layer between the pixel electrode and the entire surface of the liquid crystal side surface facing the pixel portion composed of a pixel electrode composed of a transparent electrode such as TFT and ITO. A common electrode for forming a vertical electric field to be applied to is formed. In the case of an IPS (In-Plane Switching) type LCD, the common electrode is formed in the same plane as the pixel electrode in the pixel portion of the array side substrate, thereby generating a horizontal electric field (horizontal electric field). In the case of an FFS (Fringe Field Switching) type LCD, the common electrode is formed in the pixel portion of the array side substrate with an insulating layer sandwiched above or below the pixel electrode, thereby generating an edge electric field (fringe electric field). To be In addition, red (R), green (G), and blue (B) color filters corresponding to each pixel portion are formed on the liquid crystal side surface of the color filter side substrate, and light that passes through each pixel portion. A black matrix that prevents the two from interfering with each other is formed so as to surround the outer periphery of the color filter. An overcoat layer is formed so as to cover the color filter, and a common electrode is formed on the overcoat layer. Also, the entire circumference of the liquid crystal side surface of the array side substrate and the entire circumference of the liquid crystal side surface of the color filter side substrate are bonded together by a sealing member made of epoxy resin, silicone resin, synthetic rubber or the like. Is sealed. Further, a semiconductor element as a gate signal line driving circuit element or an image signal line driving circuit element made of IC, LSI, or the like is formed on the surface of the array side substrate protruding from the sealing member on the liquid crystal side surface. It is mounted by a mounting method such as a chip on glass (FRAME) method, and an FPC (Flexible Printed Circuit) that inputs / outputs drive signals and control signals to / from semiconductor elements from the outside is installed at the end of the protruding portion. . Further, a transparent protective substrate called a cover glass is provided on the display side surface of the color filter side substrate through OCA or the like.

  Display devices are not limited to LCDs, but include organic EL (Electro Luminescence) devices, inorganic EL devices, plasma displays, FED (Field Emitting Display), SED (Surface-conduction Electron-emitter Display), GLV (Grating Light Valve) devices. PDP (Plasma Display) device, electronic paper display, DMD (Digital micro Mirror Device), piezoelectric ceramic display, LED display and the like. Furthermore, as an electronic device having these display devices, an automobile route guidance system (car navigation system), a ship route guidance system, an aircraft route guidance system, a smartphone terminal, a mobile phone, a tablet terminal, a personal digital assistant (PDA), a video Cameras, digital still cameras, electronic notebooks, electronic books, electronic dictionaries, computers, personal computers, copying machines, terminal devices for game machines, televisions, product display tags, price display tags, industrial programmable display devices, car audio, Digital audio player, facsimile, printer, automatic teller machine (ATM), vending machine, head-up display device, projector device, digital display wristwatch, smart watch, head-mounted image Display device (Head Mounted Display device: HMD), and the like.

  Note that the display device of the present invention is not limited to the above-described embodiment, and the display device according to the present invention is also within the scope of the display device of the present invention that has undergone appropriate design changes and improvements.

DESCRIPTION OF SYMBOLS 1 Light detection unit 2 Light emitting element 3 Light receiving element 4 Detected object 5 Detection signal processing part 6 Detection control part 7 Ambient light 11, 13 Detection signal 12, 14 Reference signal 11a, 13a Fluctuation component 12a, 14a of ambient light signal Reference signal with signal fluctuation component superimposed

Claims (4)

A light detection unit having a light emitting element and a light receiving element; a detection signal processing unit for detecting the proximity of a detection target based on a detection signal of the light receiving element; and the light emitting element is in a light emitting state and the light receiving element is in a light receiving state Detection control for controlling the first detection state and the second detection state in which the light receiving element is in a light receiving state in order to detect ambient light while the light emitting element is in a non-light emitting state. A proximity sensor unit having
A display unit that changes a display state when the proximity sensor unit detects the proximity of the detected object,
The detection signal processing unit takes a first difference between the detection signal and a reference signal in the first detection state, and calculates a variation component of the environment light signal acquired from the environment light in the second detection state. The proximity or non-proximity of the detected object is detected by taking a second difference with the detection signal superimposed on the reference signal in the first detection state and comparing the second difference with a threshold value. Display device.   The display device according to claim 1, wherein the reference signal is a delayed signal obtained by delaying the detection signal by 100 msec to 500 msec.   The fluctuation component includes the ambient light signal acquired when the ambient light is detected in the second detection state, and the non-detection time acquired when the ambient light is not detected in the second detection state. The display device according to claim 1, wherein the display device is a difference signal from the signal.   The display device according to claim 1, wherein, when the ambient light includes infrared rays, the light emitting element emits infrared rays, and the light receiving element detects infrared rays.