JP2008199434A - Video image display device, electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To normally detect signal light from an operation unit irrespective of distance from a device body to the operation unit, even when a video image display device is placed under inverter-type illumination in the video image display device, in which the upper-side signal light inlet position is located close to a position near the ceiling (indoor illumination), when guiding the positions of the signal light from the operation unit are separately arranged above and below by providing a large size video image display part, and the like. <P>SOLUTION: The video image display device is provided with a main receiving part 10, which generates a main detection signal according to the modulation contents of the signal light, based on photoelectric conversion of the signal light introduced from a first light-introducing position P1 and an electronic signal after the photoelectric conversion; and a sub-receiving part 20 which generates a sub-detection signal, according to the modulation contents of the signal light, based on the photoelectric conversion of the signal light introduced from a second light-introducing position P2 located on the upper part from the first light-introducing position P1 and an electrical signal after the photoelectric conversion, whose detection signal generation sensitivity to signal light intensity is lower than that of the main receiving part 10 and executes processing, according to the modulation contents of the signal light, based on the main detection signal and the sub detection signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video display device and an electronic apparatus that receive signal light transmitted from an external operation device and execute processing according to the modulation content of the signal light.

Conventionally, in a television receiver (an example of a video display device), signal light transmitted from an external operation device (so-called remote controller) is introduced into the device from a light guide unit disposed at a predetermined position on the front side of the device. The signal light is photoelectrically converted by a photodetection sensor such as a phototransistor, and a detection signal (electric signal) corresponding to the modulation content of the signal light is generated. Then, a microcomputer (an example of information processing means) executes processing according to the detection signal, for example, channel selection processing, volume adjustment processing, and the like.
In addition, since most of the front surface of the television receiver is occupied by the video display unit (for example, a liquid crystal display panel) from the center to the edge, the light guide unit is arranged around the video display unit (for example, the lower end). Near).
In a television receiver having a relatively small size of the video display unit, if the light guide unit is provided at one location around the video display unit (for example, near the lower end), the operation device generally displays video. By being directed toward the unit, the signal light is received by the light detection sensor without any particular problem, and the normal detection signal corresponding to the modulation content of the signal light can be obtained.
However, in a television receiver having a large-sized video display unit (for example, 50 inches or more), when the light guide unit exists only in one place around the video display unit, the operation device is operated relatively close to it. In such a case, even if the operation device is generally operated while being directed toward the image display unit, there may occur a situation in which the signal light is not received by the light detection sensor due to restrictions on the spread angle of the signal light.
Therefore, if the light guides are provided at a plurality of locations around the large image display unit and the signal light is detected by the light detection sensor for each of the light guides, the light receiving range of the signal light can be expanded. Even when the operating device is operated nearby, at least one of the light detection sensors can detect the signal light. For this reason, if the microcomputer performs processing based on the combined signal of the multiple detection signals obtained by the multiple light detection sensors and the logical sum signal, it operates normally even when the controller is operated relatively close to it. Is guaranteed. In this case, since the direction of the operating device operated by the user varies more in the vertical direction than in the horizontal direction, the light guide unit may be arranged near the lower end and the upper end of the video display unit. desirable.
In Patent Document 1, one of two reception signals obtained through two remote control receivers (light detection sensors) is input to a microcomputer and the other is input to a storage unit. Therefore, there is shown an apparatus for reading and analyzing the other received signal from the storage unit when it cannot be detected.
JP 11-355865 A

By the way, it is known that the light of the inverter type luminaire becomes noise of signal light for remote control. For this reason, for example, a television receiver tends to be in a state where signal light (infrared light) from an operating device cannot be normally detected under inverter-type indoor lighting, so that the operation can be controlled normally by the operating device. Therefore, the distance from the main body to the operating device is shortened.
For this reason, in a television receiver having a large video display unit (for example, 50 inches or more), since the upper end of the video display unit is close to the ceiling, the light guide unit for introducing signal light is near the upper end of the video display unit. The light of the inverter type indoor lighting is mixed in the light guide part with a relatively high power, and it becomes noise and the signal light cannot be normally detected.
Further, in the video display device in which the light guide for introducing the signal light is arranged near the lower end and the upper end of the large video display unit, the upper light guide unit and the corresponding light detection sensor are provided in the inverter-type indoor unit. It hardly works under lighting. For this reason, even if the technique disclosed in Patent Document 1 is applied to such a video display device, the light receiving range of the signal light cannot be expanded in the end, and the signal is displayed when the operating device is operated relatively close. There is a problem that a situation where light is not detected by the light detection sensor easily occurs.
Therefore, the present invention has been made in view of the above circumstances, and the object of the present invention is to provide an upper side when the introduction position of the signal light from the operation device is arranged apart vertically by providing a large image display unit or the like. Even if the signal light introduction position is near the ceiling (indoor lighting) and the electronic equipment is similar to that, even if it is placed under inverter-type lighting, it depends on the distance from the main unit to the controller. It is an object of the present invention to provide an image display device and an electronic device that can normally detect signal light from an operating device.

In order to achieve the above object, the present invention provides a video display device that receives signal light transmitted from an external operating device (so-called remote controller, mobile phone, etc.) and executes processing according to the modulation content of the signal light. The following components (1) to (3) are provided.
(1) First photoelectric conversion means for performing photoelectric conversion of the signal light introduced from the first light introduction position and a first signal corresponding to the modulation content of the signal light based on the electric signal after the photoelectric conversion One or a plurality of first receiving means including first signal generating means for generating a detection signal.
(2) Based on second photoelectric conversion means for performing photoelectric conversion of the signal light introduced from the second light introduction position located above the first light introduction position and an electric signal after the photoelectric conversion. Second signal generating means for generating a second detection signal corresponding to the modulation content of the signal light, and the sensitivity of detection signal generation to the intensity of the signal light introduced from the first receiving means is Low one or more second receiving means.
(3) Information processing means for executing processing according to the modulation content of the signal light based on the first detection signal and the second detection signal.
For example, the first light introduction position is a position below the video display unit or a position near the lower end of the video display unit, and the second light introduction position is more than the video display unit. It is an upper position or a position near the upper end of the video display unit.
A typical example of the signal light is infrared light.

The video display device according to the present invention is provided with a large video display section, etc., so that the upper signal light introduction position is close to the inverter-type illumination near the ceiling when the signal light introduction position from the operation device is arranged apart vertically. Even in the case of the position, the signal light from the operation device can be normally detected regardless of the distance from the device main body to the operation device.
That is, noise light from the inverter type illumination enters the second light introduction position on the upper side while maintaining relatively high energy, but the second receiving means with low sensitivity erroneously detects the noise light. do not do.
In addition, when the operating device is operated at a position relatively far from the apparatus main body, the signal light spreads and is almost certainly set to the first light introduction position (lower side) and the second light introduction position (upper side). Although the light energy reaches and is relatively low, the signal light from the operating device can be normally detected by the first receiving means having at least high sensitivity. At this time, since the energy of the noise light from the inverter type illumination that reaches the first light introduction position (lower side) is very low, a sufficient S / N ratio is ensured.
On the other hand, when the operating device is operated at a position relatively close to the apparatus main body, the signal light reaches only either the first light introduction position (lower side) or the second light introduction position (upper side). Not likely to become a situation. Here, when the signal light reaches the first light introduction position (lower side), the signal light is normally detected by the highly sensitive first receiving means. Further, when the signal light reaches the second light introduction position (upper side), the signal light transmitted from a short distance and having high energy is normally detected also by the second receiving means having low sensitivity. .
Accordingly, the information processing means performs processing based on a logical sum signal of the first detection signal and the second detection signal or a signal obtained by combining the first detection signal and the second detection signal. If executed, normal processing corresponding to the signal light from the operating device can be executed regardless of the distance from the apparatus main body to the operating device.

As a specific configuration for providing a difference between the sensitivity of the first receiving unit and the sensitivity of the second receiving unit, the following configuration can be considered.
For example, the second receiving means reduces the optical energy of the signal light received by the second photoelectric conversion means in the optical path from the second light introduction position to the second photoelectric conversion means. Accordingly, it is conceivable to include a light attenuating means for lowering the sensitivity of the detection signal generation than the first receiving means.
In this case, the light attenuating means includes an optical filter that restricts transmission of the signal light, a light shielding means that blocks a part of the optical path of the signal light, or a part of the signal light of the second photoelectric conversion means. Any of the light guiding means that guides the light to reach other than the light receiving unit can be considered.
Thus, a difference in signal detection sensitivity can be provided between the first receiving unit and the second receiving unit with a very simple configuration.
On the other hand, the electric signal detection sensitivity of the second signal generation means may be lower than the electric signal detection sensitivity of the first signal generation means.
In this case, it is conceivable that the video display device according to the present invention further includes sensitivity adjusting means for changing the detection sensitivity of the electric signal in the second signal generating means.
Thereby, the signal detection sensitivity of the second receiving means can be adjusted according to the installation environment (the intensity of noise light from the inverter type illumination), which is preferable.
Here, the sensitivity adjusting means may change the detection sensitivity of the electric signal in the second signal generating means in accordance with information input through a predetermined operation unit (manual sensitivity adjustment). As shown in FIG. 5, it is preferable to provide a function for performing automatic sensitivity adjustment, since the convenience is further increased.
For example, it is conceivable that the video display device according to the present invention further includes the components shown in the following (4) and (5).
(4) Mode switching means for switching between an adjustment mode in which processing according to the modulation content of the signal light is not performed by the information processing means and a mode in which the processing is canceled based on the second detection signal.
(5) An automatic sensitivity adjustment unit that automatically adjusts the detection sensitivity of the electric signal in the second signal generation unit through the sensitivity adjustment unit based on the state of the second detection signal in the adjustment mode.
Here, the sensitivity automatic adjustment means, for example, monitors the state of the second detection signal under inverter type illumination, and sets the signal detection sensitivity of the second signal generation means through the sensitivity adjustment means in an initial state. Then, the sensitivity when the second detection signal changes from the signal present state to the signal absent state is stored in the setting and storage means as the subsequent signal detection sensitivity of the second signal generating means. That's fine.
It is also conceivable that the sensitivity (conversion gain) of photoelectric conversion by the second photoelectric conversion means is lower than the sensitivity of photoelectric conversion by the first photoelectric conversion means.
The present invention can also be understood as an electronic device having the same components as the video display device according to the present invention described above.
As a result, as with the video display device having a large video display unit, when the signal light introduction position from the operation unit is arranged apart vertically, the upper signal light introduction position is closer to the ceiling (indoor lighting). In such an electronic device, the same effect as that of the video display device can be obtained.

  According to the present invention, an image in which the upper signal light introduction position is close to the ceiling (indoor lighting) when the introduction position of the signal light from the operation device is arranged apart vertically by providing a large image display unit or the like. In display devices and similar electronic devices, even when placed under inverter-type lighting, the signal light from the operating device can be detected normally regardless of the distance from the device body to the operating device.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
1 is a schematic perspective view of a video display device X according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of a main reception unit (lower reception unit) included in the video display device X, and FIG. 3 is a video image. 4 is a schematic cross-sectional view of a sub-receiving unit (upper receiving unit) included in the display device X, FIG. 4 is a block diagram showing a schematic configuration of a main part of the video display device X, and FIG. FIG. 6 schematically shows the reach range of the signal light when the operation device is operated, and FIG. 6 schematically shows the reach range of the signal light when the operation device is operated at a position close to the video display device X. 7 is a time chart showing a first example of detection signals and their combined signals of the main reception unit and the sub reception unit included in the video display device X, and FIG. 8 is a main reception unit and sub reception included in the video display device X. Second example of each detection signal and its combined signal To the time chart, FIG. 9 is a schematic cross-sectional view and a block diagram showing a second embodiment of a sub reception portion in the video display device X.

First, the configuration of the video display device X according to the embodiment of the present invention will be described with reference to FIGS.
The video display device X is, for example, a television receiver including a video display unit 1 such as a large liquid crystal display panel or plasma display panel having a size of 50 inches or more, and an external operation device 40 (so-called remote controller or mobile phone). Infrared signal light transmitted from a plurality of light introduction positions P1 and P2 is introduced into the apparatus and received, and processing corresponding to the modulation content of the signal light is executed.
The operation device 40 is provided with a plurality of operation keys (operation units), and outputs (transmits) infrared light as signal light whose intensity is modulated in accordance with the operated key.
A large portion of the front surface of the video display device X from the center to the edge is occupied by the large video display unit 1, and a plurality of light introduction positions P <b> 1 and P <b> 2 are arranged in the surrounding housing 2. Here, the second light introduction position P2 is positioned higher than the first light introduction position P1.
In the video display device X shown in FIG. 1, the first light introduction position P1 is a position below the video display unit 1 (below the lower side of the video display unit 1) or a lower end of the video display unit 1. The second light introduction position P2 is a position above the image display unit or a position near the upper end of the image display unit.
The video display device X includes two receiving units that receive the signal light from the operation device 40 and generate a signal (hereinafter referred to as a detection signal) according to the modulation content of the signal light. Hereinafter, the receiving unit for detecting the signal light introduced from the lower first light introduction position P1 is the main receiving unit 10, and the reception for detecting the signal light introduced from the upper second light introduction position P2 is performed. This part is referred to as a sub receiver 20.
As shown in FIG. 4 (a block diagram of the main part), the video display device X is generated by a detection signal (main detection signal Sg1 described later) generated by the main reception unit 10 and the sub reception unit 20. And a control unit 30 (an example of the information processing unit) that executes processing according to the modulation content of the signal light transmitted from the operation device 40 based on a detection signal (sub detection signal Sg2 described later). Yes.
The control unit 30 is referred to or recorded in the MPU 31 that performs various arithmetic processes by executing a predetermined program, the ROM 32 that stores the program executed by the MPU 31, and the process in which the MPU 31 executes the arithmetic process. EEPROM 33 in which data to be stored is stored.
For example, the control unit 30 executes channel selection processing, volume adjustment processing, and the like according to the modulation content of the signal light.
The video display device X also includes other constituent elements (not shown) included in a general television receiver, but the description thereof is omitted here.

FIG. 2 is a schematic cross-sectional view of the main receiver 10 that receives the signal light introduced from the first light introduction position P1.
The main receiving unit 10 (an example of the first receiving unit) includes a light guide unit 11 disposed at the first light introduction position P1, and a photoelectric conversion element 12 disposed on the back side of the light guide unit 11. And a detection signal generation circuit 13. Hereinafter, the photoelectric conversion element 12 and the detection signal generation circuit 13 in the main reception unit 10 are referred to as a first photoelectric conversion element 12 and a first detection signal generation circuit 13.
The light guide 11 is a member that guides the signal light that has reached the first light introduction position P1 into the apparatus (inside the housing 2). For example, a member made of acrylic, glass, or the like that transmits the signal light. It is. The light guide unit 11 illustrated in FIG. 2 is fitted into a hole provided in the housing 2 on the front surface of the video display device X. The rear end portion of the light guide portion 11 has a concave lens shape, so that most of the signal light incident obliquely from the front side is guided to the first photoelectric conversion element 12.
The first photoelectric conversion element 12 and the first detection signal generation circuit 13 are, for example, photodetection sensors provided together as phototransistors.
The first photoelectric conversion element 12 is, for example, a photodiode or the like, and performs photoelectric conversion of signal light introduced from the first light introduction position P1 through the light guide unit 11 (the first photoelectric conversion element). An example of conversion means).
The first detection signal generation circuit 13 is, for example, a transistor circuit that constitutes a phototransistor, and the modulation content of the intensity-modulated signal light based on the electrical signal obtained by photoelectric conversion by the first photoelectric conversion element 12. Is a circuit that generates a detection signal (hereinafter referred to as a main detection signal Sg1) according to the above (an example of the first signal generation means). That is, the main detection signal Sg1 is a pulse train signal that changes ON or OFF in synchronization with the timing of intensity modulation (ON / OFF) of the signal light received by the first photoelectric conversion element 12.
However, the first detection signal generation circuit 13 sets the intensity (light energy) of the signal light received by the first photoelectric conversion element 12, that is, the current level of the electric signal obtained by photoelectric conversion to a predetermined set level. If not, the dead zone is set so that the main detection signal Sg1 is OFF (the same state as when no signal light is received).

FIG. 3 is a schematic cross-sectional view of the sub receiver 20 that receives the signal light introduced from the second light introduction position P2.
Similarly to the main reception unit 10, the sub reception unit 20 (an example of the second reception unit) also includes a light guide unit 21 disposed at the second light introduction position P2, and a back surface of the light guide unit 21. A photoelectric conversion element 22 and a detection signal generation circuit 23 are provided on the side. Hereinafter, the photoelectric conversion element 22 and the detection signal generation circuit 23 in the sub reception unit 20 are referred to as a second photoelectric conversion element 22 and a second detection signal generation circuit 23.
The light guide unit 21, the second photoelectric conversion element 22, and the second detection signal generation circuit 23 in the sub reception unit 20 are respectively connected to the light guide unit 11, the first photoelectric conversion element 12, and the main reception unit 10. This is the same as the first detection signal generation circuit 13.
Thereby, in the sub receiving unit 20 (an example of the second receiving unit), the second photoelectric conversion element 22 is moved from the second light introduction position P2 located above the first light introduction position P1. The introduced signal light is subjected to photoelectric conversion (an example of the second photoelectric conversion means).
The second detection signal generation circuit 23 is a signal corresponding to the modulation content of the signal light (hereinafter referred to as sub detection signal Sg2) based on the electrical signal obtained by the photoelectric conversion of the second photoelectric conversion element 22. (An example of the second signal generating means).
However, the sub receiver 20 is less sensitive to detection signal generation with respect to the intensity of the introduced signal light than the main receiver 10.
That is, a difference is provided between the sensitivity of the main receiver 10 and the sensitivity of the sub receiver 20.

In the present embodiment, the sub-receiving unit 20 includes the optical energy of the signal light received by the second photoelectric conversion element 22 in the optical path from the second light introduction position P2 to the second photoelectric conversion element 22. An optical filter 24 (an example of the light attenuating means) is provided. The optical filter 24 is a film, an optical filter, or the like that restricts transmission of signal light of signal light (infrared light). The sub-receiver 20 is configured such that the sensitivity of detection signal generation is lower than that of the main receiver 10 by reducing the optical energy of the signal light received by the second photoelectric conversion element 22 by the optical filter 24. Has been.
For reducing the light energy of the signal light, in addition to the optical filter 24, a light shielding means (aperture or the like) that blocks a part of the optical path of the signal light, or a part of the signal light is the second photoelectric conversion. A light guiding means for guiding the light to reach other than the light receiving portion of the element 22 (changing the light path) may be considered. This light guide means can be realized, for example, by making the shape of the rear side end of the light guide 21 different from the shape of the light guide 11.
As described above, a difference in signal detection sensitivity can be provided between the main reception unit 10 and the sub reception unit 20 with a very simple configuration of attenuating signal light.

Next, with reference to FIG. 5 and FIG. 7, the reach range of the signal light and the state of the detection signal when the operation unit 40 is operated at a position far from the video display device X will be described.
FIG. 7 is a time chart of both detection signals Sg1 and Sg2 and their combined signals when the operating device 40 is operated at a position far from the video display device X. The vertical axis is the signal level (ON / OFF), and the horizontal axis is the time axis.
When the operating device 40 is operated at a position relatively far from the main body of the video display device X, as shown in FIG. 5, the signal light spreads and the first light introduction position P1 (lower side) and It reaches the second light introduction position P2 (upper side). At this time, although the light energy of the signal light reaching the light introduction positions P1 and P2 is relatively low, the signal light from the operating device 40 is normally detected by the main receiver 10 (lower side) having at least high sensitivity. (See the chart of the main detection signal Sg1 in FIG. 7). At this time, since the energy of the noise light from the inverter type illumination that reaches the first light introduction position P1 (lower side) is very low, a sufficient S / N ratio is ensured.
Here, since the second light introduction position P2 existing above or near the upper end of the large image display unit 1 is close to the inverter type illumination near the ceiling, the noise light from the inverter type illumination is relatively High energy is maintained and the upper second light introduction position P2 is reached.
However, since the upper sub-receiving unit 20 in the video display device X has low signal detection sensitivity, the noise light is not erroneously detected (see the chart of the sub-detection signal Sg2 in FIG. 7).
Therefore, a signal obtained by synthesizing both detection signals Sg1 and Sg2 and a logical sum signal thereof are signals representing the content of intensity modulation of the signal light, like the main detection signal Sg1.

Next, the reach range of signal light and the state of detection signals when the operation device 40 is operated at a position close to the video display device X will be described with reference to FIGS.
FIG. 8 is a time chart of both detection signals Sg1, Sg2 and their combined signals when the operating device 40 is operated at a position close to the video display device X. The vertical axis is the signal level (ON / OFF), and the horizontal axis is the time axis.
When the operating device 40 is operated at a position relatively close to the main body of the video display device X, the signal light is transmitted to the first light introduction position P1 (lower side) as shown in FIG. 6 (a) or (b). Side) or the second light introduction position P2 (upper side).
Here, as shown in FIG. 6B, when the signal light reaches the first light introduction position P1 (lower side), the signal light has a high sensitivity as shown in FIG. Are detected normally by the main receiver 10 (see the chart of the main detection signal Sg1 in FIG. 7). At this time, no signal light is detected in the sub-receiving unit 20 to which the signal light does not reach, as shown in FIG. 7 (see the chart of the sub-detection signal Sg2 in FIG. 7).
On the other hand, as shown in FIG. 6A, when the signal light reaches the second light introduction position P2 (upper side), the signal light transmitted from a short distance and having high energy is transmitted to the low-sensitivity sub light. It is also detected normally by the receiver 20 (see the chart of the sub detection signal Sg2 in FIG. 8). At this time, no signal light is detected by the main receiver 10 where the signal light does not reach (see the chart of the main detection signal Sg1 in FIG. 8).
Therefore, a signal obtained by synthesizing both detection signals Sg1 and Sg2 and a logical sum signal thereof are signals representing the content of intensity modulation of the signal light, similar to the sub detection signal Sg2.

As described above, the control unit 30 discriminates the transmission information by the signal light based on the signal obtained by synthesizing both the detection signals Sg1 and Sg2 and the logical sum signal thereof, and executes processing according to the discrimination result. Thereby, the control unit 30 can execute normal processing according to the signal light from the operation unit 40 regardless of the distance from the apparatus main body to the operation unit 40.
For example, when the screen size of the video display unit 1 is 50 inches, the sub-receiving unit is adopted by adopting the optical filter 24 having a signal light (infrared light) transmittance of about 10% to 20%. It is preferable if the detection signal generation sensitivity of 20 is about 10% to 20% higher than that of the main reception unit 10.

By the way, as a configuration for providing a difference between the sensitivity of the main receiving unit 10 and the sensitivity of the sub receiving unit 20, other embodiments may be considered.
For example, the first detection signal generation circuit 13 having a different dead zone so that the detection sensitivity of the electric signal by the second detection signal generation circuit 23 is lower than the detection sensitivity of the electric signal in the first detection signal generation circuit 13. It is conceivable to employ the second detection signal generation circuit 23.
Further, in the video processing apparatus X, the sub-receiving unit 20 is provided with a sensitivity adjustment circuit 25 for changing the detection sensitivity (a set current level that defines a dead zone) of the electric signal in the second detection signal generation circuit 23 (of the sensitivity adjustment means). It is also conceivable to employ a sub-reception unit (hereinafter referred to as sub-reception unit 20 ′) according to the second embodiment to which an example is added.
FIG. 9 is a schematic cross-sectional view and a block diagram of the second sub receiver 20 ′.
The sensitivity adjustment circuit 25 shown in FIG. 9 supplies a set current signal that defines a dead zone for signal detection in the second detection signal generation circuit 23 in accordance with a control command from the control unit 30.
Thereby, the signal detection sensitivity of the sub receiver 20 ′ can be adjusted according to the installation environment (intensity of noise light from the inverter type illumination), which is preferable.
Here, the control unit 30 outputs a control command corresponding to information input by a sensitivity adjustment operation with respect to the operation key of the operation device 40 to the sensitivity adjustment circuit 25, so that the sensitivity adjustment circuit 25 performs the operation. It can be considered that the detection sensitivity of the electric signal in the second detection signal generation circuit 23 is changed (manual sensitivity adjustment) in accordance with information input through the device 40.

Further, if the video display device X has a function of performing automatic sensitivity adjustment as described below, for example, the convenience is further improved and it is preferable.
For example, the modulation content of the signal light is controlled by the control unit 30 based on the sub detection signal Sg2 in accordance with information input by a predetermined sensitivity adjustment mode switching operation with respect to the operation key of the operation device 40. The process of switching to the adjustment mode that does not execute the process according to is switched to the process of returning to the original state (normal mode) after canceling the adjustment mode after a predetermined time from the transition (an example of the mode switching means).
Further, the control unit 30 automatically adjusts the detection sensitivity of the electric signal in the second detection signal generation circuit 23 through the sensitivity adjustment circuit 25 based on the state of the sub detection signal Sg2 in the adjustment mode. (An example of the automatic sensitivity adjusting means). In the adjustment mode, it is assumed that the operation device 40 is not operated (that is, no signal light is generated).
More specifically, the control unit 30 detects the signal of the second detection signal generation circuit 23 through the sensitivity adjustment circuit 25 while monitoring the generation state of the sub detection signal Sg2 under, for example, inverter type illumination. Decrease the sensitivity gradually from the initial state.
Then, the control unit 30 changes the sub detection signal Sg2 from a signal present state (ie, a state in which noise light is erroneously detected) to a state in which no signal is present (ie, a state in which noise light is not erroneously detected). Information on the current sensitivity (set current level) is stored in the EEPROM 33, and thereafter the sensitivity adjustment circuit 25 is controlled so that the sensitivity is set in the second detection signal generation circuit 23.
As a result, the signal detection sensitivity of the sub receiver 20 is automatically set so as to be maximized within a range not affected by noise light.

Further, as a configuration for providing a difference between the sensitivity of the main receiving unit 10 and the sensitivity of the sub receiving unit 20, the sensitivity (conversion gain) of photoelectric conversion by the second photoelectric conversion element 22 is the first photoelectric conversion. It is also conceivable to employ the first photoelectric conversion element 12 and the second photoelectric conversion element 22 having different sensitivities (conversion gains) so as to be lower than the photoelectric conversion sensitivity of the element 12. Further, a configuration in which an amplifier that amplifies an electric signal after photoelectric conversion is provided between the first photoelectric conversion element 12 and the first detection signal generation circuit 13 is also conceivable.
In the above-described embodiment, the first light introduction position P1 and the second light introduction position P2 are each one, and the main reception unit 10 and the sub reception unit 20 corresponding to each of the first light introduction position P1 and the second light introduction position P2 are 1 respectively. Although an example in which the number is one each (two in total) is shown, a plurality of the first light introduction positions P1 and the main reception units 10 are provided, and a plurality of the second light introduction positions P2 and the sub reception units 20 are provided. Can also be considered.
For example, one first light introduction position P1 and one main reception unit 10 corresponding to the first light introduction position P1 are arranged below the lower end at the center in the left-right direction of the video display unit 1, and two second light introduction positions P1 are arranged. A configuration in which the light introduction position P2 and the two sub-receiving units 20 corresponding thereto are arranged near the left and right corners of the upper end of the video display unit 1 can be considered.
Further, in the present invention, when the signal light introduction positions P1 and P2 from the operating device 40 are arranged apart from each other in the vertical direction, similarly to the video display apparatus X having the large video display unit 1, the upper signal light introduction position P2 is provided. Even if it is applied to an electronic device in a position close to the ceiling (indoor lighting), the same effect as that of the video display device X can be obtained.

  The present invention can be used in video display devices such as television receivers and electronic devices.

1 is a schematic perspective view of a video display device X according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a main receiving unit (lower receiving unit) included in the video display device X. FIG. 3 is a schematic cross-sectional view of a sub receiver (upper receiver) included in the video display device X. FIG. 3 is a block diagram illustrating a schematic configuration of a main part of the video display device X. The figure which represented typically the reach | attainment range of the signal beam | light when an operation device is operated in the position far from the video display apparatus X. FIG. The figure which represented typically the reach | attainment range of the signal beam | light when an operation device is operated in the position close | similar to the video display apparatus X. FIG. The time chart showing the 1st example of the detection signal of each of the main receiving part and sub receiving part with which the video display apparatus X is provided, and its synthetic | combination signal. The time chart showing the 2nd example of the detection signal of each of the main receiving part and sub receiving part with which the video display apparatus X is provided, and its synthetic signal. The schematic sectional drawing and 2nd block diagram showing 2nd Embodiment of the sub receiving part in the video display apparatus X. FIG.

Explanation of symbols

X: video display device 1: video display unit 2: casing 10: main reception unit 11: first light guide unit 12: first photoelectric conversion element 13: first detection signal generation circuits 20, 20 ′: sub reception unit 21 : Second light guide unit 22: second photoelectric conversion element 23: second detection signal generation circuit 24: optical filter 25: sensitivity adjustment circuit 30: control unit 31: MPU
32: ROM
33: EEPROM
40: Manipulator P1: First light introduction position P2: Second light introduction position

Claims (11)

A video display device that receives signal light transmitted from an external controller and executes processing according to the modulation content of the signal light,
A first photoelectric conversion means for performing photoelectric conversion of the signal light introduced from the first light introduction position and a first detection signal corresponding to the modulation content of the signal light based on the electrical signal after the photoelectric conversion One or a plurality of first receiving means comprising first signal generating means for generating;
The second photoelectric conversion means for performing the photoelectric conversion of the signal light introduced from the second light introduction position located above the first light introduction position, and the signal based on the electric signal after the photoelectric conversion A second signal generation means for generating a second detection signal corresponding to the modulation content of the light, and the detection signal generation sensitivity to the intensity of the signal light introduced from the first reception means is 1 or A plurality of second receiving means;
Information processing means for executing processing according to the modulation content of the signal light based on the first detection signal and the second detection signal;
A video display device comprising: The first light introduction position is a position below the image display unit or a position near the lower end of the image display unit;
The video display device according to claim 1, wherein the second light introduction position is a position above the video display unit or a position near an upper end of the video display unit. The second receiving means comprises:
By reducing the optical energy of the signal light received by the second photoelectric conversion means in the optical path from the second light introduction position to the second photoelectric conversion means, the first reception means The image display device according to claim 1, further comprising an optical attenuating unit that reduces the sensitivity of the detection signal generation. The light attenuating means is
An optical filter that restricts transmission of the signal light, a light shielding unit that blocks a part of the optical path of the signal light, or a light guide that guides the signal light so that a part of the signal light reaches other than the light receiving unit of the second photoelectric conversion unit. The video display device according to claim 3, wherein the video display device is one of means.   3. The video display device according to claim 1, wherein the electric signal detection sensitivity of the second signal generation unit is lower than the electric signal detection sensitivity of the first signal generation unit. 4.   6. The video display device according to claim 5, further comprising sensitivity adjusting means for changing an electric signal detection sensitivity in the second signal generating means. Mode switching means for switching between an adjustment mode in which processing according to the modulation content of the signal light is not performed based on the second detection signal by the information processing means and a mode in which the adjustment mode is canceled;
Automatic sensitivity adjustment means for automatically adjusting the detection sensitivity of the electrical signal in the second signal generation means through the sensitivity adjustment means based on the state of the second detection signal in the adjustment mode. The video display device according to claim 6.   3. The video display device according to claim 1, wherein the sensitivity of photoelectric conversion by the second photoelectric conversion unit is lower than the sensitivity of photoelectric conversion by the first photoelectric conversion unit. 4.   The information processing means executes processing based on a logical sum signal of the first detection signal and the second detection signal or a signal obtained by synthesizing the first detection signal and the second detection signal. The video display device according to claim 1.   The video display device according to claim 1, wherein the signal light is infrared light. An electronic device that receives signal light transmitted from an external controller and performs processing according to the modulation content of the signal light,
A first photoelectric conversion means for performing photoelectric conversion of the signal light introduced from the first light introduction position and a first detection signal corresponding to the modulation content of the signal light based on the electrical signal after the photoelectric conversion First receiving means comprising first signal generating means for generating;
The second photoelectric conversion means for performing the photoelectric conversion of the signal light introduced from the second light introduction position located above the first light introduction position, and the signal based on the electric signal after the photoelectric conversion A second signal generation unit configured to generate a second detection signal corresponding to the modulation content of the light, and a second detection signal generation sensitivity with respect to the intensity of the signal light introduced from the first reception unit is low; Receiving means,
Information processing means for executing processing according to the modulation content of the signal light based on the first detection signal and the second detection signal;
An electronic apparatus comprising:

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