JP2010021616A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device, which includes a plurality of light receiving units and can be easily installed in a state of the optimal installation. <P>SOLUTION: The display device includes a plurality of light receiving units 20a-20d for receiving a remote control signal transmitted from a remote control unit and a CPU (control portion) 10 for decoding an output signal output from the light receiving units and controlling the operation of the display device according to the decoded results. The CPU 10 detects mixing of noise into the output signal output from light receiving units 20a-20d when the light receiving units 20a-20d are in a state not receiving the remote control signal, and distinguishes the reception state under noise for the light receiving units 20a-20d, based on the detected results. Then, the distinguished results are displayed on a display screen of the display device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a display device that receives and decodes a remote control code signal transmitted from a remote controller and performs control according to the decoding result.

  In a display device such as a liquid crystal television, a remote controller (remote controller) can generally be used to operate the display device. Therefore, in the display device, a light receiving unit that receives a remote control signal transmitted by infrared light from an attached remote control, and a CPU that decodes the remote control signal received by the light receiving unit, analyzes the code, and executes a command And a control unit such as (Central Processing Unit).

  In recent years, with an increase in the size of a display screen, for example, a liquid crystal television or the like employs a configuration in which a plurality of light receiving portions (multi-light receiving portions) are provided to widen the light receiving range. However, the screen of a liquid crystal television is further enlarged, and a large screen type such as 108 type has appeared, and depending on the installation location, it may be easily disturbed by a remote control signal by a fluorescent lamp or the like.

  Regarding a configuration in which a plurality of remote control signal light receiving units are provided as described above, for example, Patent Document 1 discloses a remote control device that can decode a remote control signal with a single decoder for a plurality of light receiving units. Is disclosed. Here, output signals from a plurality of light receiving units are switched, a signal detection circuit for detecting whether or not a specific pattern is included is provided, and when it is detected that the output signal includes a specific pattern, the light receiving unit is adopted. I am trying to decode.

Further, in Patent Document 2, output signals from a plurality of remote control light receiving units are decoded by respective decoders, it is determined whether they are valid or invalid depending on whether the decoded results are correct, and an effective decoding path is adopted. A remote control signal receiving apparatus is disclosed.
JP-A-6-105382 JP 2001-177879 A

For example, consider a situation when a large-screen display device having a plurality of light receiving units is installed in a room or the like. In this case, in the display device, it is difficult to determine which of the plurality of light receiving units has a good reception state and which has a poor reception state while receiving a remote control signal.
In a normal operation state of a display device such as a liquid crystal television, signals from a remote controller are received by a plurality of light receiving units, each received signal is decoded by a plurality of decoders, and a CPU determines whether it is valid or invalid, The light receiving unit from which the decode signal is adopted is selected. However, when installing a display device, it is necessary to always transmit a remote control signal from the remote controller in order to determine in real time which output signal of the light receiving unit is valid or invalid. It can be said that it is very difficult to determine which light receiving unit has a poor reception state.

In Patent Document 1, outputs from a plurality of light receiving units are decoded, and a light receiving unit that performs decoding correctly is selected. Also in Patent Document 2, when decoding outputs of a plurality of light receiving units, a light receiving unit and a decoder path that are correctly decoded are selected.
However, these remote control devices or remote control signal receiving devices select the most appropriate light receiving unit after the device is installed, and are effective from the viewpoint of how to install the device. is not. In addition, here, an effective light receiving unit is finally selected. However, when the installation state of the apparatus itself is poor, there is a possibility that an invalid light receiving unit is always selected due to noise.

  The present invention has been made in view of the above circumstances, and when a display device having a plurality of light receiving units is installed, the reception state of each light receiving unit is determined in real time and displayed on the screen. Thus, an object of the present invention is to provide a display device that can be easily installed in an optimal installation state.

  In order to solve the above-described problem, a first technical means of the present invention is a display device including a display means for displaying an image, and includes a plurality of light receiving units that receive a remote control signal transmitted from a remote controller, And a control unit that controls the operation of the display device according to the decoded result, and the control unit is configured to receive a plurality of signals in a state where the plurality of light receiving units are not receiving the remote control signal. The present invention is characterized in that it detects noise mixing in the output signal output from the light receiving unit, determines the reception state of each light receiving unit based on the detected result, and performs control to display the determined result on the display means Is.

  According to a second technical means, in the first technical means, the control unit counts pulses generated from noise in the output signal from each light receiving unit when determining the reception state, and counts the number of pulses counted per unit time. Is less than a predetermined value, it is determined that the reception state is good.If the counted number of pulses is greater than the predetermined value, the reception state is determined to be bad. It is characterized by performing control to display the display to be displayed on the display means.

  The third technical means, in the first technical means, when the control unit determines the reception state, it shapes the output signal from each light receiving unit, detects the falling edge of the output signal due to noise, Control is performed to maintain the signal level at a low level based on a predetermined threshold for a predetermined time. When the waveform-shaped signal is at a high level based on the predetermined threshold, it is determined that the reception state is good, and the low level In this case, the reception state is determined to be defective, and as a result of the determination, control is performed to display a display indicating good or bad on the display means.

  The fourth technical means includes storage means for accumulating the determination result of the reception state for each light receiving unit in any one of the first to third technical means, and the control unit stores the reception state stored in the storage means. Based on the accumulated information, priorities regarding the reception state are set for each light receiving unit, and the control unit determines whether or not the received remote control signal has been correctly decoded when the light receiving unit receives the remote control signal. From the result of the determination, a priority order for decoding accuracy is set for each light receiving unit, and based on the priority order of the reception state and the priority order for decoding accuracy, the priority order is determined from among the plurality of light receiving units. The light receiving unit used for controlling the operation of the display device is selected.

  According to a fifth technical means, in the fourth technical means, whether or not the decoding has been performed correctly is performed by shaping the waveform of the received remote control signal, the pulse width of the pulse signal obtained by waveform shaping, the number of pulses, And a determination based on one or more of the widths of the start bits.

  A sixth technical means is that in the fourth or fifth technical means, there is a light receiving part in which the reception state does not become good among the plurality of light receiving parts when the control unit determines the reception state of each light receiving part. If it is determined that the light receiving unit is not good, the light receiving unit is excluded from the selection target of the light receiving unit used for controlling the operation of the display device.

  According to a seventh technical means, in any one of the fourth to sixth technical means, the control unit monitors the accumulated information of the reception state stored in the storage unit, and the determination result of the reception state of each light receiving unit is a predetermined condition. It is characterized by performing control to display predetermined warning information on the display means when it is determined whether or not the reception state has deteriorated.

According to the present invention, when installing a display device having a plurality of light receiving units, the reception state of each light receiving unit is determined in real time and displayed on the screen, so that the installation can be easily performed in an optimal installation state. It is possible to provide a display device that can be used.
In particular, according to the present invention, when the display device is installed, among the light receiving parts of the plurality of remote control signals, which light receiving part is disturbed by noise is displayed on the screen in real time. It becomes possible to make it easy to find.

  In addition, according to the present invention, it is possible to set a priority order for selecting each light receiving unit by quantifying the reception state in a state where the installation of the display device is completed. Also, if the reception status does not improve no matter how the display device is installed, stop the reading from the light receiving unit that does not improve the reception status and remove it from the selection target of the light receiving unit. However, it is possible to exclude a light receiving portion that does not improve, and it is not necessary to perform an extra determination process.

  Furthermore, according to the present invention, in addition to the accuracy of decoding of the received remote control signal, it becomes possible to select the light receiving unit in consideration of the stored information storing the determination result of the reception state of each light receiving unit. . In the display device, the accumulated information of the reception state is monitored, and when it is determined that the determination result of the reception state is deteriorated under a predetermined condition, a warning is displayed, so that the installation condition can be changed. Can tell sex. As a result, the user can easily grasp the situation of the failure in the remote control operation, so that an effect can be obtained that measures can be easily taken.

  The embodiment of the display device according to the present invention can be configured as, for example, a large-screen television. Such a display device is provided with a remote controller (remote controller) for operating the display device, and includes a plurality of light receiving units that receive remote control signals transmitted from the remote controller, and the remote control signals received by these light receiving units. Is decoded by a CPU (Central Processing Unit). At this time, one of the light receiving units is selected, and processing for controlling the operation of the display device can be executed in accordance with a decode signal obtained by decoding an output signal from the selected light receiving unit.

  In the embodiment according to the present invention, when the display device is installed in a room or the like, the display device monitors whether or not external noise such as a fluorescent lamp has entered the plurality of light receiving units, and displays it on the screen. Display. Here, the display device is in a standby state where no remote control signal is transmitted from the remote controller, and the output of the light receiving unit is monitored in real time by the CPU, and the state is displayed on the screen of a display means such as an LCD (Liquid Crystal Display). Let Thus, a user who wants to install the display device can install the display device while monitoring the reception state of the light receiving unit, and can easily select the optimal installation location and installation conditions of the display device. .

  In this case, since the display device monitors the output of the light receiving unit without receiving a signal from the remote controller, no pulse is input to the output signal of the light receiving unit when noise caused by a fluorescent lamp or the like does not enter. And in the display device, pulses are mixed when it is disturbed by noise, so the number of pulses is counted to determine the reception state, or when a pulse enters, a time constant is given, and the signal The reception state is determined based on Low / High. Then, by displaying the determined reception state, it is possible for the user to grasp the noise mixing state with respect to the light receiving unit at any time.

In addition, when noise is unavoidable regardless of how the display device is installed, it is possible to invalidate the target light receiving unit and reduce the processing target of the light receiving unit selection. In addition, during normal use of the display device, information indicating the reception state is stored in the memory when the power is turned on so that the information can be compared. Warning can be made. Furthermore, when the light receiving unit is selected, the light receiving unit can be selected by giving weight to the data of the reception state.
Hereinafter, embodiments of a display device according to the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a block diagram for explaining an embodiment of a display device according to the present invention, and shows a configuration example of a main part including a remote control signal receiving part.
In this example, the display device includes four light receiving units (first light receiving unit 20a to fourth light receiving unit 20d) for receiving a remote control signal by infrared light transmitted from the remote controller, and each of the light receiving units 20a to 20d. CPU 10 for inputting the output signal. The CPU 10 corresponds to the control unit of the present invention, and includes four decoders (first decoder 11a to fourth decoder 11d) for decoding output signals from the four light receiving units 20a to 20d, and these decoders 11a to 11d. And a decoder selection unit 12 for selecting the output from the. The CPU 10 controls the display device using the output signal of the decoder selected by the decoder selection unit 12.
In addition, in embodiment which concerns on this invention, it can apply to the thing provided with the several light-receiving part, and is not limited to the structure of four light-receiving parts.

  In the normal operation state, the display device of FIG. 1 receives signals transmitted from the remote controller by the first to fourth light receiving units 20a to 20d, and receives the received signals by the first to fourth decoders 11a to 11d. Decode. Then, the CPU 10 determines whether or not the signals decoded by the decoders 11a to 11d are correctly decoded, and selects which light receiving unit to use the decoded signal.

  As an example of processing for determining whether or not the decoded signal is correctly decoded in a normal operation state, for example, the remote control signal received by the light receiving unit is waveform-shaped, and whether or not the waveform shaping is successful is determined. By determining, it can be determined whether it is valid or invalid. In this case, for example, the pulse width and number of bits (number of pulses) of the pulse signal obtained by waveform shaping of the remote control signal, or the start bit width depending on the code, etc. are confirmed, and waveform shaping succeeds and decoding is accurate. It can be determined whether or not it was performed.

As described above, in the normal operation state of the display device, it is possible to perform an operation of determining the decoding accuracy of the remote control code signal and selecting the decode signal. As described above, when the display device is installed, In order to determine in real time whether the light receiving unit is invalid, it is troublesome, for example, it is necessary to always transmit a remote control signal from the remote control.
In this embodiment, for example, when the display device is installed in the installation mode, the CPU 10 monitors whether or not external noise such as a fluorescent lamp has entered the light receiving units 20a to 20d of the remote control signal. The installation mode is an example of an operation mode provided in the display device, and is a mode for performing an operation of displaying the reception states of the light receiving units 20a to 20d on the display screen without receiving a remote control signal. This installation mode can be selected and set by the user by a predetermined menu operation or key operation.

  That is, in the installation mode, the CPU 10 monitors the outputs of the light receiving units 20a to 20d in real time in a standby state where no remote control signal is transmitted from the remote controller, and displays the state on the display screen of the display device. Accordingly, the user can install the display device while monitoring the reception state, and can select the optimum installation location and installation conditions.

  Further, during normal use of the display device, the CPU 10 accumulates information indicating the reception state in the memory when the power is turned on, thereby displaying a warning to the user when the reception state after installation is extremely deteriorated. It is possible to perform the selection process by weighting the data of the reception state obtained in the installation mode when performing control or selecting the light receiving unit.

  Next, an example of reception state determination processing in the embodiment of the display device according to the present invention will be described. Here, as the process of determining the reception state of each of the light receiving units 20a to 20d, here, the process of counting the number of pulses of the output signal from each of the light receiving units 20a to 20d and determining the reception state based on the number of pulses, It is possible to apply a process of shaping the output signals from the light receiving units 20a to 20d and determining the reception state based on the High and Low states of the obtained signal. These processing examples will be described below.

(Example when counting the number of pulses)
The CPU 10 of the display device monitors the output signals output from the light receiving units 20a to 20d in a standby state where no remote control signal is transmitted from the remote controller, and counts the number of disturbing pulses per unit time. This count is performed for each output signal output from each of the light receiving units 20a to 20d, and each reception state is determined.
For example, if the number of disturbing pulses per unit time is n times or less for the output signals from the respective light receiving units 20a to 20d, the CPU 10 determines that the determination is “OK” (good), and the number of times is n times or more. If there is, it is determined as “NG” (defective). The above n and unit time are predetermined numerical values. And according to the determination result, CPU10 performs the display which can recognize OK or NG for each light-receiving part 20a-20. The display of the determination result on the display screen can be displayed by OSD (On Screen Display).

(Example when Low / High determination is performed by waveform shaping)
Instead of the above example of counting the number of pulses, it is also possible to determine the reception state by determining Low / High of the signal level by waveform shaping. In this case, as compared with the example in which the number of pulses is counted, in the case of NG, since it is displayed that the time is NG based on waveform shaping, it is easy for the user to grasp sensuously.

  FIG. 2 is a diagram for explaining a waveform example of an output signal from the reception unit and reception state determination processing by waveform shaping. Here, an output signal from each of the light receiving units 20a to 20d is input to a waveform shaping unit (not shown in FIG. 1), and the waveform shaping unit shapes the respective output signals. For example, the waveform shaping unit can detect the falling edge of the output signal and perform waveform shaping so that the signal level is lowered to Low for a predetermined time (for example, 2 seconds).

  FIG. 2A shows the waveform of the output signal of the light receiving unit when there is no interference due to noise. Here, the signal level does not drop to low because it is not disturbed by noise, and always maintains a high state. Even in a state where the waveform shaping unit performs waveform shaping, there is no falling, so that the High state is maintained. The signal levels Low and High are expressed by voltage levels, but may be applied with logic using current. In any case, High and Low are determined according to a predetermined threshold.

  FIG. 2B is an example of the waveform of the output signal of the light receiving unit when it is disturbed by noise. When receiving interference due to noise, the waveform of the output signal falls to Low. In this case, when waveform shaping is performed by the waveform shaping unit, a waveform that repeats High and Low is obtained as shown in FIG. As an example of processing in the waveform shaping unit, for example, a process of dropping to Low for a predetermined time (for example, 2 seconds) using a counter from the fall of the signal is performed. Alternatively, a monostable multivibrator is used to detect the falling at the falling trigger terminal, and a process for giving a time constant for a predetermined time (for example, 2 seconds) is performed.

  Then, the CPU 10 monitors the signal as shown in FIG. 2C obtained by the waveform shaping unit. If the signal is High, the signal is not disturbed. If the signal is Low, the signal is disturbed. It is determined that there is, and the determination result is displayed on the display screen. The determination result on the display screen can be displayed by the OSD. Here, for example, during the period in which the waveform shaping result is Low, it is possible to display that the reception state is disturbed on the display screen.

(Operation during normal use)
Next, an operation example during normal use in the embodiment of the display device according to the present invention will be described. The CPU 10 of the display device stores the reception states of the light receiving units 20a to 20d in the memory when the display device is turned on during normal use. The accumulated information is used to weight the decoding path. That is, the optimum light receiving unit can be selected by adding the accumulated information of the reception state in addition to the information related to the decoding accuracy used conventionally.

FIG. 3 is a diagram for explaining an example of setting the priority applied to the light receiving unit selection process.
The CPU 10 of the display device evaluates the decoding result of the output signal from each light receiving unit by judging the decoding accuracy and the reception state.
The accuracy of decoding is determined by the probability that the received remote control signal can be correctly decoded, for example. Whether the remote control signal is correctly decoded is determined by, for example, either the pulse width or the number of bits (number of pulses) of the pulse signal after waveform shaping as described above, or the width of the start bit depending on the code. Alternatively, the determination can be made by confirming a plurality.

In the example of FIG. 3, three stages of evaluations are performed on the accuracy of decoding to determine “x”, “Δ”, or “◯”. This determination can be made based on a predetermined decoding probability threshold. Here, regarding the accuracy of decoding, the priority order of the light receiving unit selection is determined according to the order of three stages. That is, the second light receiving unit, the third light receiving unit, and the fourth light receiving unit rated “◯” have the same high priority, and the priority of the first light receiving unit evaluated “x” is low. Here, the priority order is not limited to three levels, and the priority order may be determined by performing a finer evaluation, or the priority order may be determined in order from the highest decoding accuracy.
Thus, by calculating the probability that the output signal from each light receiving unit can be decoded correctly, the decoding accuracy can be quantified. Based on this quantification information, the priority of each light receiving unit is determined. I can decide.

  Further, the reception state is determined, for example, based on the reception state accumulated information. As described above, the reception state can be detected by counting the number of pulses of the output signal of the light receiving unit or performing waveform shaping to determine the Low / High without receiving the remote control signal. it can. Then, the priority of the reception state is determined from the accumulated information obtained by accumulating the reception state of each light receiving unit as described above.

In the example of FIG. 3, as with the decoding accuracy, the reception state is evaluated in three stages to determine “×”, “Δ”, or “◯”. Here, the priority of the stored information in the reception state can be determined based on a predetermined threshold. Here, with regard to the reception state, the priority order of light receiving unit selection is determined in accordance with the order of the three stages. In other words, the priority order of the fourth light receiving part with the “◯” evaluation is the highest, the priority order of the second light receiving part and the third light receiving part with the “△” evaluation is next highest, and the priority order of the first light receiving part with the “X” evaluation Is the lowest. Here, the priority order is not limited to three stages, and the priority order may be determined by performing a finer evaluation, or the priority order may be determined in the order of good reception status.
As described above, the reception state of the output signal from each light receiving unit can be quantified by calculating the reception state based on the count result of the number of pulses or the waveform shaping result, and based on this quantification information The priority of each light receiving unit can be determined.

In the example of FIG. 3, the CPU 10 selects the fourth light receiving unit from the priority order regarding the decoding accuracy of the received remote control signal and the priority order regarding the reception state, and the signal output from the fourth light receiving unit. Is used to control the operation of the display device.
Further, the CPU 10 of the display device can warn the user when the reception state of each light receiving unit is significantly worse than the tendency of the previous reception state. Further, a result of decoding accuracy may be accumulated so that a warning is displayed when the accuracy of decoding is significantly deteriorated. Whether it has deteriorated significantly is determined based on a predetermined condition. For these warnings, for example, a predetermined warning display screen can be displayed by the OSD.

  FIG. 4 is a diagram showing a screen display example of a display device having four light receiving parts (first to fourth light receiving parts), and shows an embodiment configured as a television. In FIG. 4, reference numeral 1 denotes a display device, 30 denotes a display screen of the display device, 31a to 31d denote reception result determination results of the respective light receiving units displayed on the display screen, and 32 denotes a housing of the display device.

  In the present embodiment, as described above, in the state where the remote control signal is not transmitted from the remote control (standby state), the determination of the reception state of the remote control signal by the irregular pulse detected from the output signals of the light receiving units 20a to 20d. Is displayed. That is, it is performed when the display device 1 is in the installation mode, and the display screen 30 can monitor in real time whether each of the light receiving units 20a to 20d is picking up noise. Thus, when installing the display device 1, the user can easily find an installation location that is not easily disturbed while monitoring the display screen 30 of the display device 1.

That is, as shown in FIG. 4, the display device 1 of the present embodiment includes four light receiving units 20 a to 20 d, and each of these light receiving units 20 a to 20 d is located outside the four corners of the rectangular display screen 30. Has been placed. Then, determination result displays 31a to 31d for displaying the reception states of the respective light receiving units 20a to 20d can be displayed in the vicinity of the four corners of the display screen 30.
Here, as described above, the determination result of the reception state is displayed based on the count result of the number of pulses in a state where the remote control signal is not transmitted or the Low / High determination result based on the shaped waveform. At the time of determination by waveform shaping, “OK” can be displayed when High, and “NG” can be displayed when Low.

  In this example, the first light receiving unit 20a is displayed as “light receiving unit A”, and “NG” is displayed as the determination result. Similarly, the second to fourth light receiving portions 20b to 20d are also displayed as "light receiving portion B", "light receiving portion C", and "light receiving portion D", and the determination results are "OK", "OK", " It is displayed as “OK”. Thereby, the user can visually recognize at a glance that the light receiving units other than the light receiving unit A (first light receiving unit 20a) are in a good reception state without interference.

  On the display screen 30, in addition to the “OK” or “NG” determination result corresponding to each of the light receiving units 20 a to 20 d, information related to the reception state of the remote control signal can be displayed. For example, in a normal operation state after the display device 1 is installed, a warning can be displayed when the reception state is extremely deteriorated. In this case, the CPU 10 stores the determination result of the reception state in the memory, compares the past reception state with the current reception state, and determines, for example, that the reception state has deteriorated under a predetermined condition. Then, control is performed to generate and display a warning display OSD.

Furthermore, you may make it display which light-receiving part is selected now among several light-receiving part 20a-20d. For example, when the fourth light receiving unit is selected in the case shown in FIG. 3, it can be displayed by the OSD.
When the remote control signal is not transmitted, the reception status of each of the light receiving units 20a to 20d is displayed. When the remote control signal is received, whether the decoding result of the received signal by each of the light receiving units 20a to 20d is OK. You may make it display whether it is NG.

  FIG. 5 is a flowchart for explaining an example of processing in the display device according to the present invention. First, when the display device enters the installation mode by mode selection (step S1), the remote control disturbance monitor mode is selected and the reception state is displayed (step S2). This state is a state where no transmission is made from the remote control transmitter (standby state). The remote control disturbance monitor mode is a mode for monitoring and displaying the reception state in the light receiving unit in the installation mode.

  Then, the user installs the display device main body in an optimum place where the user is not easily disturbed while watching the display of the reception state (step S3). Here, it is determined whether or not the receiving state of all the light receiving units 20a to 20d is good (step S4). If not, reading of the light receiving unit path where the receiving state does not become good no matter how it is installed is stopped. (Step S12). Stopping the reading of the light receiving unit path means that the output signal from the light receiving unit is not used without being read by the CPU 10.

  The processing at this time is such that the CPU 10 automatically determines a light receiving unit whose reception state is not good in the installation mode and performs control to automatically stop reading of the light reception path. The user may perform a user operation so as to stop reading the light receiving unit path where the reception state is not good.

  If the reception state of all the light receiving units is good in step S4, the reception state is quantified (step S5). The reception state can be quantified by counting the number of pulses of the output signal of the light receiving unit as described above, or performing waveform shaping to determine the Low / High. Further, the processing of step S5 is also performed after reading of the light receiving path that is not good in step S12 is stopped. Then, prioritization of the light receiving units is performed according to the reception state (step S6). Prioritization according to the reception state can be performed by determining the reception state from the accumulated information obtained by accumulating the reception state of each light receiving unit. For example, as shown in FIG. 3, it is possible to execute prioritization in a plurality of stages based on the accumulated information of the reception state.

  The above processing is processing in the installation mode. After that, when the mode is changed to the normal mode and a remote control signal is received from the remote controller (step S7), the decoding accuracy of each light receiving unit is quantified (step S8). Here, for example, the probability of correctly decoding the remote control signal is quantified. Then, prioritization of the light receiving units according to the decoding accuracy is performed (step S9). For example, as shown in FIG. 3, prioritization in a plurality of stages based on the probability that the remote control signal can be correctly decoded can be executed.

  Then, it is determined which light receiving unit is selected based on the decoding accuracy and the reception state (step S10), and the light receiving unit to be employed is determined (step S11). Determining the light receiving unit is to select a specific light receiving unit and a decoding path from the light receiving unit among a plurality of light receiving units, and a decoding signal obtained by decoding an output signal from the specific light receiving unit is controlled. It is selected as a signal used for.

  FIG. 6 is a block diagram illustrating a configuration example of a television in which the display device of the present invention is implemented. The display device of the present invention can be applied to a television that can be operated by a remote controller, and can be particularly suitably applied to a television that has recently increased in screen size. In this case, the television includes a plurality of light receiving units for receiving a remote control signal, and the user can easily set an optimal installation position by the display processing of the reception state in the installation mode as described above. .

  The television 100 in the example of FIG. 6 is a device that can receive both digital broadcasts and analog broadcasts, and is connected to a reception antenna 101 that receives analog broadcasts and a reception antenna 102 that receives digital broadcasts. In addition, an analog tuner unit 103 that selects a received signal of an analog broadcast, a digital tuner unit 104 that selects a received signal of a digital broadcast, and an AV separation unit 105 that extracts audio data / video data from the received data of the analog broadcast And a digital demodulator 106 for demodulating the selected digital broadcast data.

  Furthermore, the TV 100 decodes EPG (Electronic Program Guide) data and separates demodulated data, and decodes the separated digital broadcast video data and captures video information as a still image. A video decoding / capturing section 108, a video selector section 109 for switching between an analog broadcast video signal and a digital broadcast video signal, a separate EPG process and an OSD display process, and an EPG and reservation information. And an EPG / OSD / reservation data processing unit 110 that performs processing for mixing and displaying.

  Furthermore, the television 100 combines an audio decoding unit 111 that decodes the separated audio data, a video output conversion unit 112 that converts the selected video signal and the EPG or OSD and then converts the selected video signal into a video output, and displays a video according to the video output. A liquid crystal display device 117 that performs switching between an audio signal for analog broadcasting and an audio signal for digital broadcasting, an audio output conversion unit 114 that converts the selected audio signal into an output signal, and an audio output signal And a channel selection unit 115 that performs channel selection processing with analog and digital broadcast tuners.

In addition, the television 100 includes a RAM 116 that is a semiconductor memory that can be read and written by designating an arbitrary address, and a CPU 10 that performs overall processing and processes operation signals from a remote controller.
Furthermore, the television 100 controls the rewritable nonvolatile memory 120 in which programs, user data, EPG display format data, and the like are stored, and a network such as a telephone line, a LAN, the Internet, and the like. A communication control unit 121 used for acquisition and the like, and a light receiving unit 20 (corresponding to the light receiving units 20a to 20d configured in FIG. 1) that receives an infrared signal from a remote controller 119 operated by a user.

  In the embodiment according to the present invention, a plurality of light receiving units are provided as the light receiving unit 20, and signals output from the respective light receiving units are input to the CPU 10, and each output signal can be decoded by a decoder inside the CPU 10. It has become. The CPU 10 monitors the reception status of signals output from a plurality of light receiving units, and performs control to store the reception status and to perform weighting processing for light receiving unit selection.

  With such a configuration, when the television 100 is installed in a room or the like, the television 100 monitors whether or not an external noise such as a fluorescent lamp has entered the light receiving unit 20 and displays it on the screen. Can do. That is, in the television 100, in a standby state in which no remote control signal is transmitted from the remote controller 119, the output of the light receiving unit 20 is monitored in real time by the CPU 10, and the state is displayed on the screen of the liquid crystal display device 117. Thus, a user who wants to install the television 100 can install the television 100 while monitoring the reception state of the remote control signal, and can easily select the optimum installation location and installation conditions.

  Further, after the television 100 is installed, an optimum light receiving unit can be selected by taking into account the reception state of each light receiving unit in addition to the decoding accuracy.

1 is a block diagram for explaining an embodiment of a display device according to the present invention. It is a figure for demonstrating the example of a waveform of the output signal from a receiving part, and the determination process of the presence or absence of disturbance by waveform shaping. It is a figure for demonstrating the example of a setting of the priority applied to the selection process of a light-receiving part. It is a figure which shows the example of a screen display of the display apparatus which has four light-receiving parts (1st-4th light-receiving part). It is a flowchart for demonstrating an example of the process in the display apparatus by this invention. It is a block diagram which shows the structural example of the television which implemented the display apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 10 ... CPU, 11a, 11b, 11c, 11d ... Decoder, 12 ... Decoder selection part, 20 ... Light-receiving part, 20a, 20b, 20c, 20d ... Light-receiving part, 30 ... Display screen, 31a ... Determination result Display, 100 ... TV, 101 ... Receiving antenna, 102 ... Receiving antenna, 103 ... Analog tuner section, 104 ... Digital tuner section, 105 ... AV separation section, 106 ... Digital demodulation section, 108 ... Capture section, 109 ... Video selector section 110: Reservation data processing unit, 111: Audio decoding unit, 112 ... Video output conversion unit, 113 ... Audio selector unit, 114 ... Audio output conversion unit, 115 ... Channel selection unit, 116 ... RAM, 117 ... Liquid crystal display device, 118 ... Speaker, 119 ... Remote control, 120 ... Non-volatile memory, 121 ... Communication control Part.

Claims (7)

A display device comprising display means for displaying an image,
A plurality of light receiving units for receiving a remote control signal transmitted from the remote control; and a control unit for decoding the output signals output from the plurality of light receiving units and controlling the operation of the display device according to the decoded result;
The control unit detects mixing of noise with respect to output signals output from the plurality of light receiving units in a state where the plurality of light receiving units are not receiving the remote control signal, and each of the control units is based on the detection result. A display device characterized by determining a reception state of a light receiving unit and performing control to display the determined result on the display means. 2. The display device according to claim 1, wherein the control unit counts pulses generated from noise in an output signal from each of the light receiving units when determining the reception state, and counts the counted number of pulses per unit time. If the value is equal to or less than a predetermined value, the reception state is determined to be good, and if the counted number of pulses is greater than the predetermined value, the reception state is determined to be bad,
As a result of the determination, a control is performed to display on the display means a display indicating the good or bad. 2. The display device according to claim 1, wherein, when determining the reception state, the control unit shapes the output signal from each of the light receiving units, detects a falling edge of the output signal due to noise, and performs predetermined processing. During the time, control to maintain the signal level at a low level based on a predetermined threshold,
When the waveform-shaped signal is at a high level based on the predetermined threshold, the reception state is determined to be good, and when the signal is at the low level, the reception state is determined to be bad,
As a result of the determination, a control is performed to control the display means to display a display indicating good or defective. The display device according to claim 1, further comprising a storage unit that accumulates the determination result of the reception state for each of the light receiving units.
The control unit sets a priority order for the reception state for each light receiving unit based on the accumulation information of the reception state stored in the storage unit,
The control unit determines whether or not the received remote control signal has been correctly decoded when the light receiving unit receives the remote control signal, and the decoding result is determined for each light receiving unit based on the determination result. Set priorities for accuracy,
A light receiving unit to be used for controlling the operation of the display device is selected from the plurality of light receiving units based on the priority order of the reception state and the priority order regarding the accuracy of decoding. Display device.   5. The display device according to claim 4, wherein whether or not the decoding has been accurately performed is performed by shaping the waveform of the received remote control signal, the pulse width of the pulse signal obtained by shaping the waveform, the number of pulses, and the start. A display device characterized in that the determination is made based on one or a plurality of bit widths.   6. The display device according to claim 4, wherein the control unit includes a light receiving unit in which the reception state does not become favorable among the plurality of light receiving units when the reception state of each of the light receiving units is determined. If it is determined that the light receiving unit is not good, the light receiving unit is excluded from the selection target of the light receiving unit used for controlling the operation of the display device. The display device according to any one of claims 4 to 6,
The control unit monitors the accumulated information of the reception state stored in the storage unit, determines whether or not the determination result of the reception state of each light receiving unit has deteriorated according to a predetermined condition, and the reception state has deteriorated. A display device characterized by performing control to display predetermined warning information on the display means when it is determined to be a thing.

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