KR20090036761A - Input device for digital television and input method thereof - Google Patents
Input device for digital television and input method thereof Download PDFInfo
- 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
- Authority
- KR
- South Korea
- Prior art keywords
- gpio
- key input
- input unit
- unit
- voltage
- Prior art date
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Classifications
-
- 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
Description
BACKGROUND OF THE
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
As shown, each of the first
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
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
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
The digital
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
Meanwhile, the
Subsequently, the generated OSD data is input to the
The
The
As described above, the
Meanwhile, the
The digital
The broadcast
The
In this case, when the user wants to display the audio for video and the OSD menu for determining each display property through the
The
The
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
The first
As described above, the key buttons SW101 to SW108 perform respective functions (channel +-, volume +-, ok, menu, tv / video, power).
The GPIO
To this end, the GPIO
Accordingly, when the first
The
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
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
That is, the user inputs any one key among the plurality of key buttons SW101 to SW108 formed in the first
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
Therefore, the
In addition, the GPIO
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
That is, when the first
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
More specifically, when the GPIO voltage level is changed from a high voltage to a low voltage, a function (channel +-, volume +-) of the first
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
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)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020070101985A KR20090036761A (en) | 2007-10-10 | 2007-10-10 | Input device for digital television and input method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020070101985A KR20090036761A (en) | 2007-10-10 | 2007-10-10 | Input device for digital television and input method thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20090036761A true KR20090036761A (en) | 2009-04-15 |
Family
ID=40761630
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020070101985A KR20090036761A (en) | 2007-10-10 | 2007-10-10 | Input device for digital television and input method thereof |
Country Status (1)
Country | Link |
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KR (1) | KR20090036761A (en) |
-
2007
- 2007-10-10 KR KR1020070101985A patent/KR20090036761A/en not_active Application Discontinuation
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