KR20090036761A - Input device for digital television and input method thereof - Google Patents

Input device for digital television and input method thereof Download PDF

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Publication number
KR20090036761A
KR20090036761A KR1020070101985A KR20070101985A KR20090036761A KR 20090036761 A KR20090036761 A KR 20090036761A KR 1020070101985 A KR1020070101985 A KR 1020070101985A KR 20070101985 A KR20070101985 A KR 20070101985A KR 20090036761 A KR20090036761 A KR 20090036761A
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KR
South Korea
Prior art keywords
gpio
key input
input unit
unit
voltage
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KR1020070101985A
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Korean (ko)
Inventor
김승호
Original Assignee
엘지전자 주식회사
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Priority to KR1020070101985A priority Critical patent/KR20090036761A/en
Publication of KR20090036761A publication Critical patent/KR20090036761A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42676—Internal components of the client ; Characteristics thereof for modulating an analogue carrier signal to encode digital information or demodulating it to decode digital information, e.g. ADSL or cable modem
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/485—End-user interface for client configuration

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • User Interface Of Digital Computer (AREA)

Abstract

An input device for a digital television and an input method thereof are provided to process limited ADC(Analog Digital Convert) by using a GPIO(General Purpose Input/Output) terminal, thereby inputting a plurality of keys through a smaller number of input terminals. A GPIO level input unit(111) changes and outputs a GPIO voltage level during key input of the first input unit(110). A controller(200) senses key input of the second key input unit(120) and the first key input unit through the first ADC terminal(210). The controller determines a changed state of the GPIO voltage level outputted from the GPIO level input unit through the GPIO terminal. When it is determined that the GPIO voltage level is changed, the controller selectively performs functions of the first and second key input units inputted through the first ADC terminal.

Description

Input device for digital television and input method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input device of a digital television and a method of inputting the same, wherein a user command is input through an analog terminal (ADC) terminal of the digital television.

As is well known, television refers to a device or method of viewing something stationary or moving from a distance by the power of electricity without delay of time.

In addition, recently developed digital television is a television capable of adding high quality screen reproduction and various functions by converting a received broadcast signal into a digital code, and is a so-called third generation television that passed through the black and white era and the color era. to be.

Digital television is equipped with a separate IC (Integrated Circuit), which can add various functions, and converts analog signals from broadcasting stations into digital signals to prevent deterioration of video and audio signals. Because of this, you can't see the dual screen caused by the reflection of the analog radio and there's no noise at all.

 Such digital televisions are provided with input devices for inputting user commands such as power on / off, channel change, volume control, and the like.

The input device is a device used for input of a user command to a digital television, also called an input system. Usually, a key input device is applied through on / off key operation of a contact button.

1 is a block diagram illustrating an input device of a conventional digital television, wherein a first key input unit 11, a second key input unit 12, a control unit (MCU) 20, a first ADC terminal unit 21, and a second ADC are shown. The terminal portion 22 and the third ADC terminal portion 23 are included.

As shown, each of the first key input unit 11 and the second key input unit 12 of the conventional input device is a resistor divider corresponding to each function of the key control circuit. An on-screen display (OSD) operation is implemented by applying different DC voltages to the lowband ACD inputs of the first to third ADC terminal parts 21 to 23 of the control unit as a circuit.

On the other hand, in most television systems, about 8 key buttons (SW101 to SW108) perform each function (channel +-, volume +-, ok, menu, tv / video, power), and voltage of 3.3V. The two first groups of the control unit (MCU) 20 are divided into two groups, i.e., the first key input unit 11 and the second key input unit 12, by dividing the level into four steps, respectively. And the low-band ADCs of the second ADC terminal portions 21 to 22 are processed for key operation.

Conventional key control operation uses a resistor divider circuit at a voltage of 3.3V, and configures a DC level in 4 steps with a difference in resistance values considering ± 5% tolerance of resistance. Is processed. In this case, if the number of keys is 8, two ADCs 21, 22 should be used, and if 12 keys, three ADCs 21, 22, 23 should be used.

However, in the input device of the conventional digital television as described above, as the TV and monitor functions are diversified, the demand of the low-band ADC terminal portion increases due to functions such as RGB sensor processing, SCART ID processing, and tuner AGC processing. There is a burden to add an additional extended ADC IC to the limited ADC input processing. Accordingly, there has been a problem that the function of the key control is also increased, causing the lack of the ADC terminal portion according to the increase in the number.

Accordingly, the present invention is to solve the above-mentioned conventional problems, and to input a plurality of keys through a small number of input terminals by using a combination of the ADC terminal and the GPIO (General Purpose Input / Output) terminal of the digital television. It is an object of the present invention to provide an input device for a digital television and an input method thereof.

An input device of a digital television according to the present invention for achieving the above object, the first key input unit and the second key input unit for inputting any one key; A GPIO level input unit for changing and outputting a GPIO voltage level when a key is pressed in the first key input unit; Detects key input of the first key input unit and the second key input unit through a first ADC terminal unit, determines a change state of the GPIO voltage level output from the GPIO level input unit through a GPIO terminal unit, and changes the GPIO voltage level. If it is determined that it comprises a control unit for selectively performing the function of the first key input unit or the second key input unit input through the first ADC terminal unit.

The change of the GPIO voltage level is changed from high voltage to low voltage or from low voltage to high voltage.

When the GPIO voltage level is changed from a high voltage to a low voltage, the first key input unit may perform a function of the first key input unit.

When the GPIO voltage level is changed from a low voltage to a high voltage, the second key input unit may perform a function of the second key input unit.

When the first key input unit is input, a low voltage level may be generated and input to the GPIO terminal unit due to the divided voltage of the pull-up resistor and the pull-down resistor connected in series with the reference voltage.

When the first key input unit is input, the diodes D1 to D4 connected in the forward direction are activated to divide the reference voltage.

In addition, the input method of the digital television according to the present invention comprises the steps of: inputting any one key of the first key input unit and the second key input unit; Sensing key input of the first key input unit and the second key input unit through a first ADC terminal unit of a control unit; Changing and outputting a GPIO voltage level at a key input of the first key input unit at a GPIO level input unit; Determining a change state of a GPIO voltage level output from the GPIO level input unit through a GPIO terminal unit of the control unit; And selectively performing a function of the first key input unit or the second key input unit input through the first ADC terminal unit when it is determined that the GPIO voltage level is changed.

According to the input device of the digital television and the input method thereof according to the present invention, as the TV and monitor functions are diversified, the demand of the low-band ADC terminal unit increases due to functions such as RGB sensor processing, SCART ID processing, tuner AGC processing, and the like. Even if it is used, the GPIO terminal is used together for the limited ADC input process, so that it is possible to input a plurality of keys through a small number of input terminals without adding an ADC input terminal.

In addition, there is no need to add an ADC input terminal, which reduces the cost of adding an ADC IC, thereby simplifying circuit configuration and operation.

The effects of the present invention described above describe the effects of the preferred embodiment of the present invention, and the present invention is not limited to the effects described above and may exhibit more various effects predictable according to the operation of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a general configuration of a digital television to which the present invention is applied.

As shown, the digital television of the present invention, OSD (Under control of the control unit 307, the memory 308, the user interface unit 304 for receiving key input, the OSD (control) 307 for the overall control of the system) OSD generator 309 for generating On Screen Display data, an antenna 301 for receiving broadcast signals, a tuner 302 for tuning a broadcast channel for viewing under the control of the controller 307, and the tuner 302 The digital broadcast signal processor 303 for processing a digital broadcast signal (or a transport stream) from the digital broadcast signal, and output signals from the digital broadcast signal processor 303 to a video stream, a data stream, and the video audio. The broadcast signal output unit 310, which is separated into an audio stream containing the data audio, and then converted into audible or displayable video, audio and data, respectively An amplifier 318 for amplifying audible audio with a predetermined amplification, a speaker 319 for outputting the amplified audio output from the amplifier 318 as an audible voice, and the output from the broadcast signal output unit 310. And a display module 320 for displaying the video and the data on the screen.

The digital broadcast signal processor 303 includes a demodulator 303a and a decoder 303b. The broadcast signal output unit 310 includes a demultiplexer 311, an audio decoder 312, a data decoder 313, and a video decoder. 314, an audio processor 315, a data processor 316, and a video processor 317.

The components will be described in more detail. Here, another receiver in the present embodiment uses a television broadcast receiver as an example, but the present invention can be applied to another receiver such as a set top box.

First, the control unit 307 controls the television broadcast receiver as a whole, and in particular, drives the tuner 302 to tune a broadcast signal of a desired channel according to the data broadcast channel selection of the user watching the data broadcast. And a control signal for determining display attributes of the tuned data broadcast according to the user's selection.

Meanwhile, the controller 307 controls the OSD generator 309 to generate corresponding OSD data according to the user's function selection. For example, the controller 307 is configured to generate OSD data corresponding to each of the display property menu items on the screen when the user presses a menu key to determine the display properties through the user interface 304. The OSD generator 309 is controlled.

Subsequently, the generated OSD data is input to the video processor 317 of the broadcast signal output unit 310, mixed with the video, and provided to the display module 320. Each display property menu item is displayed on the screen for the user to select through the user interface 304. Meanwhile, the user may directly select each display property through predetermined function keys among the keys of the user interface 304.

The memory 308 stores various information including a system program of the controller 307.

The user interface 304 is a keypad, a remote controller, or the like, and provides various commands or information input from the user to the controller 307.

As described above, the OSD generator 309 generates the OSD data under the control of the controller 307 and provides the OSD data to the video processor 317 of the broadcast signal output unit 310.

Meanwhile, the tuner 302 tunes one data broadcast channel under the control of the controller 307 among broadcast signals received in the form of a transport stream, and digital broadcasts corresponding to the transport stream of the tuned data broadcast channel, respectively. The processing unit 303 is provided. The television broadcast receiver may receive signals from various sources, such as analog broadcast signals and external input signals.

The digital broadcast signal processor 303 includes a demodulator 303a and a decoder 303b. The demodulator 303a demodulates a transport stream provided by the tuner 302, and the decoder 303b demodulates the demodulator. The decoded transport stream is decoded into an audio stream, a video stream, and a data stream and provided to the broadcast signal output unit 310.

The broadcast signal output unit 310 separates the transport stream output from the digital broadcast signal processor 303 from the demultiplexer 311 and the demultiplexer 311 that separate and output the audio stream, the video stream, and the data stream. An audio decoder (312) for decoding the decoded audio stream, an audio processor (315) for making the decoded audio signal into an audible video audio and data audio, and separating the data stream separated from the demultiplexer (311). A data decoder 313 for decoding, a data processor 316 for making the decoded data signal into displayable data corresponding to the display attributes selected by the user, and decoding the video stream separated in the multiplexer 311. Video decoder 314, the decoded video It consists of a video processor 317 that turns the false signal into a displayable video.

The OSD generator 309 provides the OSD data generated under the control of the controller 307 to the video processor 317 of the broadcast signal output unit 310 to be mixed with the video and displayed together on the screen. To be possible.

In this case, when the user wants to display the audio for video and the OSD menu for determining each display property through the user interface 304, the OSD generator 309 generates OSD data for each display property. To the video processor 317. That is, the user can select each display property directly or through items of the OSD menu using the keys of the user interface 304.

The display module 320 includes an LCD module, a PDP module, a CRT module, and the like. The communication signal input / output unit 306 inputs and outputs a communication signal of the DTV receiver 300 from the modem 305.

The control unit 307 is applied to a microcomputer (Micom), a central processing unit (CPU) or a micro controller unit (MCU), and the user interface 304 is a key for turning on / off a normal key button by a user's operation. Input devices are generally applied.

3 is a block diagram illustrating in more detail an input device of a digital television according to the present invention.

As shown, the present invention is the first key input unit 110, the second key input unit 120, GPIO level input unit 111, diode unit 112, 113, control unit (MCU) 200, the first The ADC terminal unit 210, the GPIO terminal unit 220, the second ADC terminal unit 230, a pull-up resistor R1, a pull-down resistor R2, and diodes D1 to D4 are included.

The first key input unit 110 and the second key input unit 120 are operated by a user to input any one of a plurality of key buttons SW101 to SW108. In FIG. 3, only the first key input unit 110 and the second key input unit 120 are illustrated, but a plurality of key input units may be configured.

As described above, the key buttons SW101 to SW108 perform respective functions (channel +-, volume +-, ok, menu, tv / video, power).

The GPIO level input unit 111 changes and outputs a GPIO voltage level when a key is input by the first key input unit 110.

To this end, the GPIO level input unit 111 generates a low voltage level by the divided voltage of the pull-up resistor R1 and the pull-down resistor R2 connected in series with the reference voltage when the first key input unit 110 is input. It is input to the terminal unit 220. At this time, when the first key input unit 110 is input, the diodes D1 to D4 connected in the forward direction are activated to divide the reference voltage Vcc. In FIG. 3, the diodes D1 to D4 are grouped into a first diode part 112 and a second diode part 113 for convenience.

Accordingly, when the first key input unit 110 is input, the diodes D1 to D4 connected in the forward direction are activated to pull the 3.3 V reference voltage Vcc into a pull-up resistor R1 of 4.7 KΩ and a pull-down resistor R4 of 4.7 KΩ. A low voltage level of 0.3 to 0.35 V is generated by the divided voltage and is input to the GPIO terminal unit 220.

The control unit 200 detects key input of the first key input unit 110 and the second key input unit 120 through the first ADC terminal unit 210 and the GPIO level input unit 111 through the GPIO terminal unit 220. Determine a change state of the GPIO voltage level outputted from the control unit; and if it is determined that the GPIO voltage level is changed, the first key input unit 110 or the second key input unit inputted through the first ADC terminal unit 110. Optionally perform the function of 120.

In this case, the change of the GPIO voltage level is changed from a high voltage to a low voltage or a low voltage to a high voltage.

Therefore, when the GPIO voltage level is changed from the high voltage to the low voltage, the first key input unit 110 performs the functions (channels +-and volume +-) input through the first ADC terminal unit 210. Meanwhile, when the GPIO voltage level is changed from a low voltage to a high voltage, a function (ok, menu, tv / video, power) of the second key input unit 120 input through the first ADC terminal unit 220 is performed. .

4 is a control flowchart illustrating an input method of a digital television according to the present invention, which will be described in more detail with reference to the accompanying drawings.

First, as shown, the step of inputting any one of the first key input unit 110 and the second key input unit 120 is performed (S010).

That is, the user inputs any one key among the plurality of key buttons SW101 to SW108 formed in the first key input unit 110 and the second key input unit 120. At this time, the reference voltage Vcc of 3.3V is divided by the respective resistors to generate a predetermined division voltage Vcc for identifying each key, and transmit the predetermined voltage Vcc to the controller 200.

For example, a voltage of 2.8V for channel +, 2.1V for channel +, 1.0V for volume + and 0.1V for volume- is generated at the input of the first key input unit 110.

Therefore, the controller 200 detects key input of the first key input unit 110 and the second key input unit 120 transmitted through the first ADC terminal unit 210 (S020).

In addition, the GPIO level input unit 111 performs a step of changing and outputting a GPIO voltage level when a key is input by the first key input unit 110 (S030).

In this case, the change of the GPIO voltage level is changed from a high voltage to a low voltage or a low voltage to a high voltage, and the control unit 200 outputs the GPIO voltage output from the GPIO level input unit 111 through the GPIO terminal unit 220. The state of change of the level is determined (S040).

That is, when the first key input unit 110 is input, the GPIO level input unit 111 generates a low voltage level by the divided voltage of the pull-up resistor R1 and the pull-down resistor R2 connected in series with the reference voltage. It is input to the terminal unit 220. At this time, when the first key input unit 110 is input, the diodes D1 to D4 connected in the forward direction are activated to divide the reference voltage Vcc. Accordingly, when the first key input unit 110 is input, the diodes D1 to D4 connected in the forward direction are activated to pull the 3.3 V reference voltage Vcc into a pull-up resistor R1 of 4.7 KΩ and a pull-down resistor R4 of 4.7 KΩ. A low voltage level of 0.3 to 0.35 V is generated by the divided voltage and is input to the GPIO terminal unit 220.

As described above, the change of the GPIO voltage level is changed from a high voltage to a low voltage or a low voltage to a high voltage. When it is determined that the GPIO voltage level is changed, the first inputted through the first ADC terminal unit 210 is performed. The function of the key input unit 110 or the second key input unit 120 is selectively performed (S050 to S060).

More specifically, when the GPIO voltage level is changed from a high voltage to a low voltage, a function (channel +-, volume +-) of the first key input unit 110 input through the first ADC terminal unit 210 is performed. (S050).

When the GPIO voltage level is changed from a low voltage to a high voltage, a function (ok, menu, tv / video, power) of the second key input unit 120 input through the first ADC terminal unit 220 is performed (S060). ).

Therefore, even if the demand for the low-band ADC terminal increases due to functions such as RGB sensor processing, SCART ID processing, and tuner AGC processing according to the diversification of TV and monitor functions, the GPIO terminal is used together for limited ADC input processing. This allows a large number of keys to be entered through a small number of input terminals without the need for additional ADC input terminals.

The present invention described above can be applied not only to flat-panel monitors such as PDPs and LCDs, but also to set-top boxes, projection TVs, general TVs, monitors, and other video devices, and can be equally applied to analog TVs, digital TVs, and satellite TVs. have. In addition, it can of course be applied to all NTSC, PAL, SECAM method.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments without departing from the spirit of the present invention as claimed in the claims. Anyone skilled in the art can make various changes and, of course, such changes are within the scope of the appended claims.

1 is a block diagram showing an input device of a conventional digital television.

2 is a block diagram showing a general configuration of a digital television to which the present invention is applied.

3 is a block diagram showing an input device of a digital television according to the present invention;

4 is a control flowchart showing an input method of a digital television according to the present invention;

<Description of the symbols for the main parts of the drawings>

100: key input means 110: first key input portion

120: second key input section 111: GPIO level input section

112, 113: diode 200: control unit (MCU)

210: first ADC terminal portion 220: GPIO terminal portion

230: second ADC terminal portion R1: pull-up resistor

R2: Pulldown resistor D1 ~ D4: Diode

Claims (12)

A first key input unit and a second key input unit for inputting any one key; A GPIO level input unit for changing and outputting a GPIO voltage level when a key is pressed in the first key input unit; Detects key input of the first key input unit and the second key input unit through a first ADC terminal unit, determines a change state of the GPIO voltage level output from the GPIO level input unit through a GPIO terminal unit, and changes the GPIO voltage level. And a control unit for selectively performing a function of the first key input unit or the second key input unit inputted through the first ADC terminal unit when it is determined that the first ADC terminal unit is used. The method of claim 1, And the change of the GPIO voltage level is changed from a high voltage to a low voltage or from a low voltage to a high voltage. The method of claim 2, And performing a function of the first key input unit input through the first ADC terminal unit when the GPIO voltage level is changed from a high voltage to a low voltage. The method of claim 2, And performing a function of the second key input unit input through the first ADC terminal unit when the GPIO voltage level is changed from a low voltage to a high voltage. The method of claim 3, wherein And when the first key input unit is input, a low voltage level is generated by the divided voltage of a pull-up resistor and a pull-down resistor connected in series with a reference voltage and input to the GPIO terminal unit. The method of claim 5, And a diode (D1 to D4) connected in a forward direction when the first key input unit is input to divide the reference voltage. Inputting any one of a first key input unit and a second key input unit; Sensing key input of the first key input unit and the second key input unit through a first ADC terminal unit of a control unit; Changing and outputting a GPIO voltage level at a key input of the first key input unit at a GPIO level input unit; Determining a change state of a GPIO voltage level output from the GPIO level input unit through a GPIO terminal unit of the control unit; And And selectively performing a function of the first key input unit or the second key input unit inputted through the first ADC terminal unit when it is determined that the GPIO voltage level is changed. . The method of claim 7, wherein And changing the GPIO voltage level from a high voltage to a low voltage or from a low voltage to a high voltage. The method of claim 8, And performing a function of the first key input unit inputted through the first ADC terminal unit when the GPIO voltage level is changed from a high voltage to a low voltage. The method of claim 8, And performing a function of the second key input unit inputted through the first ADC terminal unit when the GPIO voltage level is changed from a low voltage to a high voltage. The method of claim 9, And a low voltage level is generated by the divided voltage of the pull-up resistor and the pull-down resistor connected in series to the reference voltage when the first key input unit is input, and is input to the GPIO terminal unit. The method of claim 11, And a diode (D1 to D4) connected in a forward direction when the first key input unit is input to divide the reference voltage.
KR1020070101985A 2007-10-10 2007-10-10 Input device for digital television and input method thereof KR20090036761A (en)

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KR1020070101985A KR20090036761A (en) 2007-10-10 2007-10-10 Input device for digital television and input method thereof

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KR20090036761A true KR20090036761A (en) 2009-04-15

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