TWI415391B - Input signal detecting circuit and liquid crystal television thereof - Google Patents

Abstract

A liquid crystal television responds in an immediate correspondence with a received power-off signal, a received video/audio signal, a received data signal, or a received remote signal, so as to leave or enter a standby mode. While no signal for leaving the standby mode is received, primary voltage sources of the liquid crystal television are shut down so as to ensure the reduction of power consumption.

Description

Input signal detection circuit and related LCD TV

The invention discloses an input signal detecting circuit and a related liquid crystal television, in particular to an input signal detecting circuit and a related liquid crystal television which save power consumption in a standby mode.

Please refer to FIG. 1 , which is a schematic functional block diagram of a general LCD TV 100. As shown in FIG. 1, the liquid crystal television 100 includes a main system board 105, a display panel 160, a speaker 170, and a frequency converter 150. The main system board 105 includes a power board 110, a primary level microcontroller 120, a computing unit 130, and an audio amplifier 140. The power board 110 includes a standby power module 112 and a main power module 114. The main power module 114 includes a computing unit power supply V1, an audio amplifier power supply V2, and a backlight power supply V3. When the LCD TV 100 enters the standby mode, the power board 110 will only reserve the power of the standby power module 112 and turn off all the power sources included in the main power module 114. After the LCD TV 100 is ready to leave the standby mode and enter the normal operation mode, the standby power module 112 provides a standby voltage Vsb to the secondary microcontroller 120 when the secondary microcontroller 120 receives the prompt button command or the remote controller. When the command is turned on, the secondary microcontroller 120 outputs a signal PON having a higher potential to activate the computing unit power supply V1, the audio amplifier power supply V2, and the backlight power supply V3 included in the main power supply module 114 to initiate calculations. The unit 130, the audio amplifier 140, and the frequency converter 150 drive the display panel 160 and the speaker 170 accordingly, wherein the frequency converter 150 is used to drive the backlight mode of the display panel 160. However, although in the standby mode, the standby power module 112 still consumes the equivalent power of the main system board 105, the standby power module 112 still has room for improvement in saving power in the standby mode of the liquid crystal television 100.

The invention discloses an input signal detecting circuit. The input signal detecting circuit comprises a switch and a transistor. The open relationship includes an open end, a closed end, and an output end. The open end is grounded. The closed end is used to receive a shutdown signal. The open relationship determines whether to output a signal input by the closed end or the open end according to whether the closed signal is received. One input end of the transistor is coupled to the output end of the switch. One of the bias terminals of the transistor is coupled to a voltage source. One of the outputs of the transistor is used to output an enable signal. The turn-on signal is used to turn on the power included in a power strip.

The invention discloses an input signal detecting circuit. The input signal detecting circuit comprises an inverse amplifying circuit, an integrating circuit, and a switching circuit. The reverse amplification circuit is coupled to a first voltage source. The inverse amplification circuit is configured to receive an audio signal to generate an amplification signal. The integration circuit is used to integrate the amplification signal to generate an integration signal. The switch circuit includes a first transistor and a second transistor. An input end of the first transistor is coupled to the integrating circuit to receive the integrated signal, and a first bias end of the first transistor is coupled to a second voltage source. An input end of the second transistor is coupled to the first bias end of the first transistor, and a bias end of the second transistor is coupled to a third voltage source, and the second One of the outputs of the crystal is used to output an open signal. The turn-on signal is used to turn on the power included in a power strip.

The invention discloses an input signal detecting circuit. The input signal detecting circuit includes a first switching circuit and a second switching circuit. The first switching circuit includes a first transistor. One input end of the first transistor is configured to receive a data signal, and one of the bias terminals of the first transistor is grounded. The second switching circuit includes a second transistor. An input end of the second transistor is coupled to an output end of the first transistor and a first voltage source. One of the bias terminals of the second transistor is coupled to a second voltage source. One of the output terminals of the second transistor outputs an activation signal. The start signal is used to activate the power supply included in a power strip.

The invention discloses an input signal detecting circuit. The input signal detecting circuit comprises an inverse amplifying circuit, an integrating circuit, a switching circuit, and a self-holding circuit. The reverse amplification circuit is coupled to a first voltage source. The inverse amplification circuit is configured to receive a remote control signal to generate an amplified signal. The integration circuit is used to integrate the amplification signal to generate an integration signal. The switch circuit includes a first transistor and a second transistor. An input end of the first transistor is coupled to the integration circuit to receive the integration signal. One of the first bias terminals of the first transistor is grounded. The second bias end of the first transistor is coupled to a second voltage source. An input end of the second transistor is coupled to the second bias end of the first transistor. One of the bias terminals of the second transistor is coupled to a third voltage source. One of the output terminals of the second transistor outputs an activation signal. The start signal is used to turn on the power included in a power board. The self-holding circuit includes a third transistor. One input end of the third transistor is coupled to the start signal. One of the first bias terminals of the third transistor is grounded. A second bias end of the third transistor is coupled to the input end of the second transistor.

The invention discloses a liquid crystal television. The LCD television includes a battery, an input signal pattern detecting circuit, a signal source, a relay, a power board, and a display panel. The input signal pattern detecting circuit is coupled to the battery to receive power provided by the battery. The input signal detecting circuit receives a turn-off signal, an audio-visual signal, a data signal, and/or a remote control signal, and generates an activation signal according to the signals. The input signal mode detecting circuit comprises a power signal detecting circuit, an audio signal detecting circuit, a data signal detecting circuit and a remote signal detecting circuit. The power signal detecting circuit is configured to generate the start signal according to the turn-off signal. The video signal detecting circuit is configured to generate the start signal according to the video signal. The data signal detecting circuit is configured to generate the start signal according to the data signal. The remote signal detecting circuit is configured to generate the start signal according to the remote control signal. The signal source is used to provide a plurality of drive signals. The relay is configured to receive the start signal by the input signal mode detecting circuit, and is configured to receive the plurality of driving signals by the signal source. The power board is coupled to the relay to activate its power source and receive the plurality of driving signals in a standby mode according to the startup signal. The display panel is coupled to the power board and configured to display a picture according to the power received by the power board and according to the plurality of driving signals.

In order to further reduce the power consumption of the standby power module disposed in the LCD TV in the standby mode, the present invention relates to various signal sources used in the liquid crystal television, and discloses various input signal detecting circuits, and discloses the inclusion of these inputs. LCD TV with signal detection circuit.

Please refer to FIG. 2 , which is a schematic functional block diagram of a liquid crystal television 200 according to the present invention. As shown in FIG. 2, the liquid crystal television 200 includes a main system board 205, a frequency converter 150, a display panel 160, and a speaker 170. The main system board 205 includes an input power source 210, a relay 220, a power board 110, a computing unit 130, an audio amplifier 140, and an input signal pattern detecting circuit 250. The main system board 205 can optionally additionally provide a battery 280 to supply the power consumption required by the input signal mode detecting circuit 250 in the standby mode. The input signal mode detecting circuit 250 includes a first input signal detecting circuit 300, a second input signal detecting circuit 400, a third input signal detecting circuit 500, and a fourth input signal detecting circuit 600. The first input signal detecting circuit 300 receives a turn-off signal Power_key, that is, the television signal is being received by the liquid crystal television 200. Therefore, the first input signal detecting circuit 300 sends a signal PON to cause the liquid crystal television 200 to be out of the standby mode. The second input signal detecting circuit 400 receives an audio and video signal AV. When the video signal AV is received, it indicates that the television signal is being received by the liquid crystal television 200. Therefore, the second input signal detecting circuit 400 sends a signal PON to make the liquid crystal television. 200 is out of standby mode; wherein the video signal AV can be a composite video connector sigal. The third input signal detecting circuit 500 receives the first data signal HDMI representing one of the external input data or the second data signal PC representing one of the personal computers (PC), and the external data input is received when the data signal HDMI is received. The data or the external PC signal is being received by the LCD TV 200, so the third input signal detecting circuit 500 generates the signal PON to make the LCD TV 200 out of the standby mode; wherein the data signal HDMI can be a high quality image. High Definition Multimedia Interface Signal (HDMI signal). The fourth input signal detecting circuit 600 receives a remote control signal IR. When the remote control signal IR is received, it indicates that an external remote controller issues an instruction to turn on the liquid crystal television 200, so the fourth input signal detecting circuit 600 generates a signal accordingly. The PON removes the liquid crystal television 200 from the standby mode. Note that in the embodiments of the present invention, since the signal strength of the video signal AV and the remote control signal IR is low, it is necessary to increase the respective signal strengths by the amplifying circuit. Detection procedure. When the input signal mode detecting circuit 600 receives the signal including one of the input signal detecting circuits, the signal PON is generated to turn on or off the relay 220, so that the relay 220 can turn on the power sources V1, V2 included in the power board 110. V3, and the power sources that are turned on are used to turn on the corresponding devices.

Detailed embodiments of the above-described respective input signal detecting circuits 300, 400, 500, 600 will be described below. Please refer to FIG. 3, which is a schematic diagram of the input signal detecting circuit 300 shown in FIG. 2. As shown in FIG. 3, the input signal detecting circuit 300 includes a switch SW101, a transistor Q101, resistors R101 and R102, and a diode D101. The switch SW101 includes an open end NC and a closed end NA. The open end NC is grounded. The shutdown terminal NA is configured to receive the shutdown signal Power_key, and the switch SW101 determines the ground potential signal coupled to the output end NC or the power-off signal Power_key input by the open terminal NA according to whether the shutdown signal Power_key is received. An input terminal of the transistor Q101 is coupled to an output terminal NB of the switch SW101 through a resistor R101. One of the bias terminals of the transistor Q101 is coupled to a standby voltage source Vsb31, and one output of the transistor Q101 is used. The enable signal PON is output to turn on the relay 220 and the power board 110. The first end of the resistor R101 is coupled to the output terminal NB of the switch SW101, and the second end of the resistor R101 is coupled to the input end of the transistor Q101. The first end of the resistor R102 is coupled to the second end of the resistor R101, and the second end of the resistor R102 is coupled to the bias end of the transistor Q101.

In a preferred embodiment of the present invention, the transistor Q101 is a pnp type bipolar junction transistor, and the input end of the transistor Q101 is a base, and the transistor Q101 The bias terminal is an emitter, and the output of the transistor Q101 is a collector. One input end of the diode D101 is coupled to the output end of the transistor Q101, and one of the second ends of the diode D101 outputs the signal PON.

The operation of the input signal detecting circuit 300 is detailed below. When the liquid crystal television 200 enters the standby mode from the normal operating state, the switch SW101 switches to the off terminal NA, so that the input terminal of the transistor Q101 is at a high potential and the transistor Q101 is turned off, so that the signal PON is at a low potential. Conversely, when the LCD TV 200 enters the normal operating state from the standby mode, the switch SW101 switches to the open terminal NC, so that the input terminal of the transistor Q101 is at a low potential and the transistor Q101 is turned on, so that the signal PON is at a high potential and is turned on. The power source V1, V2, and V3 included in the relay 220 and the power board 110.

Please refer to FIG. 4, which is a schematic diagram of the input signal detecting circuit 400 shown in FIG. 2. As shown in FIG. 4, the input signal detecting circuit 400 includes a capacitor C201, a resistor R201, an inverse amplifying circuit 410, an integrating circuit 420, a switching circuit 430, and a diode D201. The reverse amplifier circuit 410 is coupled to a first standby voltage source Vsb41.

The reverse amplifier circuit 410 receives the video signal AV having a lower potential through the capacitor C201 and the resistor R201, and increases the potential of the video signal AV to generate an amplified signal AV_A. The reverse amplifying circuit 410 includes a transistor Q201, resistors R202, R203, and R204; one input end of the transistor Q201 receives the video signal AV through a resistor R201 and a capacitor C201; and the first bias end of the transistor Q201 transmits through The resistor R204 is coupled to the standby voltage source Vsb41, and one of the second bias terminals of the transistor Q201 is grounded.

The integrating circuit 420 includes a capacitor C202 and a resistor R205. One end of the resistor R205 is used to receive the amplified signal AV_A, and the second end of the resistor R205 is used to output the integrated signal AV_C. A first end of the capacitor C202 is coupled to the second end of the resistor R205, and a second end of the capacitor C202 is grounded. The integrating circuit 420 integrates the amplified signal AV_A by the capacitor C202 and the resistor R205 to generate the integrated signal AV_C.

Switch circuit 430 includes transistors Q202 and Q203, and resistors R206, R207, R208, and R209. In the switching circuit 430, the input end of the transistor Q202 is coupled to the integrating circuit 420 to receive the integrated signal AV_C, and one of the first bias terminals of the transistor Q202 is coupled to a second standby voltage source Vsb42. The input end of the transistor Q203 is coupled to one of the output terminals of the transistor Q202 through a resistor R208. One of the bias terminals of the transistor Q203 is coupled to the third standby voltage source Vsb43, and one of the outputs of the transistor Q203 is used for output. The signal PON is turned on to turn on the power supplies V1, V2, and V3 included in the relay 220 and the power board 110. A first end of the resistor R206 is coupled to the input end of the transistor Q202, and a second end of the resistor R206 is coupled to a second bias end of the transistor Q202 and grounded. The first end of the resistor R207 is coupled to the first bias end of the transistor Q202, and the second end of the resistor R207 is coupled to the second standby voltage source Vsb42. The first end of the resistor R208 is coupled to the first bias end of the transistor Q202, and the second end of the resistor R208 is coupled to the input end of the transistor Q203. The first end of the resistor R209 is coupled to the second end of the resistor R208, and the second end of the resistor R209 is coupled to the bias terminal of the transistor Q203. The first end of the diode D201 is coupled to an output end of the transistor Q203 to receive and output the signal PON to turn on the power supplies V1, V2, and V3 included in the relay 220 and the power board 110.

In a preferred embodiment of the present invention, the transistors Q201 and Q202 are both npn-type bipolar junction transistors, and the transistor Q203 is a pnp-type bipolar junction transistor. The input end of the transistor Q201 is a base, the first bias end of the transistor Q201 is a collector, and the second bias end of the transistor Q201 is an emitter; the transistor The input end of the Q202 is a base, the bias end of the transistor Q202 is a collector, and one of the emitters of the transistor Q202 is grounded; the input end of the transistor Q203 is a base, and the electric The bias end of the crystal Q203 is an emitter, and the output end of the transistor Q203 is a collector.

The mode of operation of the input signal detection circuit 400 is detailed below. When the input signal detecting circuit 400 receives the high-level video signal AV, the transistor Q201 is turned on, and the potential of the video signal AV passes through the voltage division of the resistors R202 and R203 and the bias voltage of the first standby voltage source Vsb41. It is amplified in the reverse direction and is generated in the form of the amplified signal AV_A at the bias end of the transistor Q201; the reverse amplification here means that the lower the potential of the video signal AV is located in the transistor 201. The potential at the bias terminal is accompanied by an increase in the voltage at which the resistor R202 is higher than the voltage divided by R204. Due to the opening of the transistor Q201, the potential of the bias terminal of the transistor Q201 is lowered, so that the amplification signal AV_A is actually at a low potential. The integrating circuit 420 integrates the low-level amplified signal AV_A to a certain extent, and generates an integrated signal AV_C at a high potential at the input end of the transistor Q202 to turn on the transistor Q202; thus, the first bias of the transistor Q202 The potential at the voltage terminal is lowered to be at a low potential, and the transistor Q203 is turned on. Due to the opening of the transistor Q203, the potential of the output terminal of the transistor Q203 is biased by the third standby voltage source Vsb43, so that the signal PON is at a high potential, and the relay 220 and the power board 110 are turned on. Contains power supplies V1, V2, V3.

Please refer to FIG. 5, which is a schematic diagram of the input signal detecting circuit 500 shown in FIG. As shown in FIG. 5, the input signal detecting circuit 500 includes a first switching circuit 510, a second switching circuit 520, and a diode D301. The first switch circuit 510 includes a transistor Q301 and resistors R301 and R302. The second switching circuit 520 includes a transistor Q302 and resistors R303, R304, and R305.

In the first switch circuit 510, one of the input terminals of the transistor Q301 receives the data signal HDMI or PC through the resistor R301, and one of the bias terminals of the transistor Q301 is grounded. The first end of the resistor R301 is used to receive the data signal HDMI or PC, and the second end of the resistor R301 is coupled to the input end of the transistor Q301. A first end of the resistor R302 is coupled to the second end of the resistor R301, and a second end of the resistor R302 is grounded.

In the second switch circuit 520, one of the input terminals of the transistor Q302 is coupled to one of the output terminals of the transistor Q301 via a resistor R304 and a first standby voltage source Vsb51. One of the bias terminals of the transistor Q302 is coupled to the first terminal. The second standby voltage source Vsb52, and one of the outputs of the transistor Q302 outputs a signal PON to activate the relay 220 and the power supplies V1, V2, V3 included in the power board 110. The first end of the resistor R303 is coupled to the output end of the transistor Q301, and the second end of the resistor R303 is coupled to the first standby voltage source Vsb51. A first end of the resistor R304 is coupled to the output end of the transistor Q301, and a second end of the resistor R304 is coupled to the input end of the transistor Q302. The first end of the resistor R305 is coupled to the second end of the resistor R304, and the second end of the resistor R305 is coupled to the bias end of the transistor Q302. A first end of the diode D301 is coupled to the output end of the transistor Q302, and a second end of the diode D301 is used to output the signal PON.

In a preferred embodiment of the present invention, the transistor Q301 is an npn-type bipolar junction transistor, and the transistor Q302 is a pnp-type bipolar junction transistor, wherein the input end of the transistor Q301 is a base, the bias end of the transistor Q301 is an emitter, the output end of the transistor Q301 is a collector, and the input end of the transistor Q302 is a base, and the transistor Q302 is biased. The pressing end is an emitter, and the output end of the transistor Q302 is a collector.

The operation of the input signal detecting circuit 500 is explained as follows. When the input signal detecting circuit 500 receives the high potential data signal HDMI or PC, the transistor Q301 is turned on to pull down the potential of the output terminal of the transistor Q301, and thus the transistor Q302 is turned on. As a result, the potential of the output terminal of the transistor Q302 rises due to the bias of the second standby voltage source Vsb52, so that the signal PON is at a high potential, and then the relay 220 and the power source V1, V2 included in the power board 110 are turned on. V3.

Please refer to FIG. 6 , which is a schematic diagram of the input signal detecting circuit 600 shown in FIG. 2 . As shown in FIG. 6, the input signal detecting circuit 600 includes a resistor R501, an inverse amplifying circuit 610, an integrating circuit 620, a switching circuit 630, a self-holding circuit 640, and a diode D501. The inverse amplification circuit 610 includes a transistor Q501 and resistors R502, R503, and R504. The integrating circuit 620 includes a resistor R505 and a capacitor C501. The switch circuit 630 includes transistors Q502 and Q504, and resistors R506, R507, R508, R509, and R512. The self-holding circuit 640 includes a transistor Q503 and resistors R510 and R511.

In the inverting amplifier circuit 610, one input end of the transistor Q501 receives the remote control signal IR through the resistor R501, one of the first bias terminals of the transistor Q501 is grounded, and one of the second bias terminals of the transistor Q501 is coupled. A first standby voltage source Vsb61. The first end of the resistor R503 is coupled to the input end of the transistor Q501, and the second end of the resistor R503 is coupled to the first bias end of the transistor Q501. The first end of the resistor R502 is coupled to the input end of the transistor Q501, and the second end of the resistor R502 is coupled to the first standby voltage source Vsb61. The first end of the resistor R504 is coupled to the second bias end of the transistor Q501, and the second end of the resistor R504 is coupled to the second end of the resistor R502. The reverse amplification circuit 610 receives the remote control signal IR and amplifies its potential in a reverse manner, and generates an amplification signal IR_A on the second bias terminal of the transistor Q501.

In the integrating circuit 620, a first end of the resistor R505 is coupled to the second bias end of the transistor 501 to receive the amplified signal IR_A, and a second end of the resistor R505 is used to output the integrated signal IR_C. A first end of the capacitor C501 is coupled to the second end of the resistor R505, and a second end of the capacitor C501 is grounded. The integrating circuit 620 integrates the received amplified signal IR_A, and outputs the integrated signal IR_C at the second end of the resistor R505.

In the switch circuit 630, one input end of the transistor Q502 is coupled to the resistor R505 to receive the integral signal IR_C, one of the first bias terminals of the transistor Q502 is grounded, and one of the second bias terminals of the transistor Q502 is The second standby voltage source Vsb62 is coupled to the second standby voltage source. A first end of the resistor R506 is coupled to the input end of the transistor Q502, and a second end of the resistor 506 is coupled to the first bias end of the transistor Q502. An input end of the transistor Q504 is coupled to the second bias end of the transistor Q502 through a resistor R508. One bias end of the transistor Q504 is coupled to a third standby voltage source Vsb63, and the transistor One of the outputs of the Q504 outputs an enable signal PON to turn on the power supplies V1, V2, and V3 included in the relay 220 and the power board 110. The first end of the resistor R507 is coupled to the output terminal of the transistor Q502, and the second end of the resistor R507 is coupled to the second standby voltage source Vsb62. A first end of the resistor R508 is coupled to the output end of the transistor Q502, and a second end of the resistor R508 is coupled to the input end of the transistor Q504. The first end of the resistor R509 is coupled to the input terminal of the transistor Q504, and the second end of the resistor R509 is coupled to the third standby voltage source Vsb63. A first end of the resistor R512 is coupled to the second end of the resistor R509, and a second end of the resistor R512 is coupled to the bias end of the transistor Q504.

In the self-holding circuit 640, one input end of the transistor Q503 is coupled to and receives the enable signal PON, one of the first bias terminals of the transistor Q503 is grounded, and one of the second bias terminals of the transistor Q503 is coupled to The input of transistor Q504. The first end of the resistor R510 receives the enable signal PON, and the second end of the resistor R510 is coupled to the input end of the transistor Q503. A first end of the resistor R511 is coupled to the second end of the resistor R510, and a second end of the resistor R511 is grounded.

In a preferred embodiment of the invention, transistors Q501, Q502, and Q503 are npn-type bipolar junction transistors, and transistor Q504 is a pnp-type bipolar junction transistor. Therefore, the input end of the transistor Q502 is a base, the bias end of the transistor Q502 is an emitter, and the output end of the transistor Q502 is a collector; the input end of the transistor Q504 is As a base, the bias end of the transistor Q504 is an emitter, and the output end of the transistor Q504 is a collector; the input end of the transistor Q503 is a base, and the transistor Q503 The first bias end is an emitter, and the second bias end of the transistor Q503 is a collector; the input end of the transistor Q501 is a base, and the first bias end of the transistor Q501 is It is an emitter, and the second bias end of the transistor Q501 is a collector.

The operation of the input signal detecting circuit 600 is explained as follows. When the user briefly activates the remote controller and causes the remote control signal IR to briefly appear high, the reverse amplification circuit 610 amplifies the remote control signal IR in the reverse manner as described above, and is second in the transistor Q501. The voltage terminal generates an amplification signal IR_A, and then the integration circuit 620 integrates the amplification signal IR_A to generate an integration signal IR_C. When the potential of the integration signal IR_C is accumulated enough to turn on the transistor Q502 by its high potential, the potential of the output terminal of the transistor Q502 is lowered to turn on the transistor Q504, so that the potential of the output terminal of the transistor Q504 is at the third standby voltage. The source Vsb63 exhibits a high potential under the bias voltage, and accordingly outputs a high potential enable signal PON to turn on the relays 220 and the power supplies V1, V2, and V3 included in the power board 110. However, since the remote control signal IR activated by the user is only maintained for a short period of time, if the remote control signal IR returns to a low level, the activation signal PON will return to a low level and cause the above respective power sources to be turned off. To prevent this, the self-holding circuit 640 maintains the high potential of the enable signal PON by keeping the input of the transistor Q504 low. When the self-holding circuit 640 receives the high-potential enable signal PON through the resistor R510, the transistor Q503 turns on and continues to pull down the input terminal potential of the transistor Q504, while maintaining the transistor Q504 on and the high potential of the enable signal PON.

The invention discloses a liquid crystal television and an input signal detecting circuit corresponding to various types of signals. The LCD TV can react to the received shutdown signal, video signal, data signal, and remote control signal to get out of the standby mode, and maintain the LCD TV when no signal is received from the standby mode. The main power supply is turned off to ensure a reduction in power consumption.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100, 200. . . LCD TV

105, 205. . . Main system board

110. . . Power Board

112. . . Standby power module

114. . . Main power module

120. . . Secondary microcontroller

130. . . Computing unit

140. . . audio amplifier

150. . . Frequency converter

160. . . Display panel

170. . . speaker

V1, V2, V3. . . power supply

210. . . Input power

220. . . Relay

250. . . Input signal mode detection circuit

280. . . battery

300, 400, 500, 600. . . Input signal detection circuit

410, 610. . . Inverting amplifier circuit

420, 620. . . Integral circuit

430, 510, 520, 630. . . Switch circuit

640. . . Self-holding circuit

SW101. . . switch

Q101, Q201, Q202, Q203, Q301, Q302, Q501, Q502, Q503, Q504. . . Transistor

R101, R102, R201, R202, R203, R204, R205, R206, R207, R208, R209, R301, R302, R303, R304, R305, R501, R502, R503, R504, R505, R506, R507, R508, R509, R510, R511, R512‧‧‧ resistance

C201, C202‧‧‧ capacitor

D101, D201, D301, D501‧‧‧ diode

NA‧‧‧Close

NC‧‧‧ open end

Power_key‧‧‧ Turn off the signal

PON, POFF‧‧‧ signal

AV‧‧‧ audio and video signals

IR‧‧‧Remote signal

AV_A, IR_A‧‧‧Amplified signal

AV_C, IR_C‧‧‧ integral signal

HDMI, PC‧‧‧ data signal

Vsb31, Vsb41, Vsb42, Vsb43, Vsb51, Vsb52, Vsb61, Vsb62, Vsb63‧‧‧ Standby voltage source

Figure 1 is a schematic block diagram of a general LCD TV.

FIG. 2 is a schematic block diagram of a liquid crystal television disclosed in the present invention.

Figures 3, 4, 5, and 6 show schematic diagrams of various input signal detecting circuits included in the liquid crystal television shown in Fig. 2.

200. . . LCD TV

205. . . Main system board

110. . . Power Board

130. . . Computing unit

140. . . audio amplifier

150. . . Frequency converter

160. . . Display panel

170. . . speaker

V1, V2, V3. . . power supply

210. . . Input power

220. . . Relay

250. . . Input signal mode detection circuit

280. . . battery

300, 400, 500, 600. . . Input signal detection circuit

Power_key. . . Turn off the signal

PON, POFF. . . Signal

AV. . . Video signal

IR. . . Remote control signal

HDMI, PC. . . Data signal

Claims (10)

A liquid crystal television comprising: a battery; an input signal pattern detecting circuit coupled to the battery to receive power provided by the battery, the input signal detecting circuit receiving a turn-off signal, an audio signal, and a data signal And/or a remote control signal, and generating an activation signal according to the signals, the input signal pattern detection circuit includes: a power signal detection circuit for generating the activation signal according to the off signal; an audio signal detection a test circuit for generating the start signal according to the video signal; a data signal detecting circuit for generating the start signal according to the data signal; and a remote signal detecting circuit for generating the start signal according to the remote signal a signal source for providing a plurality of driving signals; a relay for receiving the activation signal by the input signal mode detecting circuit, and for receiving the plurality of driving signals by the signal source; a power board And being coupled to the relay to activate the power and receive the plurality of driving signals in a standby mode according to the startup signal ; And a display panel, coupled to the power board, and to the received power to the power board and displayed according to a driving signal of the plurality of pictures. The LCD TV of claim 1, further comprising: a computing unit coupled to the power board, the computing unit configured to receive power of the power board and the plurality of driving signals for emitting a standby signal to enable The power board enters the standby mode and is configured to drive the display panel with the received power and the plurality of driving signals; and an audio amplifier coupled to the power board and one of the speakers included in the display panel for The power provided by the power board and the plurality of drive signals drive the speaker. The liquid crystal television of claim 1, wherein the input signal detecting circuit comprises: a switch comprising an open end, a closed end and an output end, wherein the open end is grounded, and the closed end is used for receiving a closing signal, and the opening relationship determines whether to output a signal input by the closing end or the opening end according to whether the closing signal is received; and a transistor, wherein an input end is coupled to the output end of the switch One of the bias terminals of the transistor is coupled to a voltage source, and one of the output terminals of the transistor is configured to output an enable signal, wherein the turn-on signal is used to turn on a power source included in a power board. The liquid crystal television of claim 3, wherein the input signal detecting circuit further comprises: a first resistor, a first end of which is coupled to the output end of the switch, and a second one of the first resistors The end is coupled to the input end of the transistor; a second resistor is coupled to the second end of the first resistor, and a second end of the second resistor is coupled to the bias end of the transistor. The liquid crystal television of claim 1, wherein the input signal detecting circuit comprises: an inverse amplifying circuit coupled to a first voltage source, wherein the inverse amplifying circuit is configured to receive an audio signal to generate an amplification An integration circuit for integrating the amplification signal to generate an integration signal; and a switching circuit comprising: a first transistor, the input end of which is coupled to the integration circuit to receive the integration signal, and the The first biasing end of the first transistor is coupled to a second voltage source; and the second transistor has an input end coupled to the first bias end of the first transistor, the first One of the two transistors is coupled to a third voltage source, and one of the output terminals of the second transistor is configured to output an enable signal. The liquid crystal television of claim 5, wherein the first electro-crystalline system is an npn-type bipolar junction transistor, and the second electro-crystalline system is a pnp-type bipolar junction transistor; wherein the first The input end of the transistor is a base, the first bias end of the first transistor is a collector, and one of the first transistors is grounded; wherein the second transistor The input end is a base, the bias end of the second transistor is an emitter, and the output end of the second transistor is a collector. The liquid crystal television of claim 1, wherein the input signal detecting circuit comprises: a first switching circuit comprising: a first transistor, an input end for receiving a data signal, and the first circuit One of the crystals is biased to be grounded; and a second switching circuit includes: a second transistor having an input coupled to an output of the first transistor and a first voltage source, the first One of the two transistors is coupled to a second voltage source, and one of the output terminals of the second transistor outputs an activation signal, wherein the activation signal is used to activate a power supply included in a power board. The liquid crystal television of claim 7, wherein the first switch circuit further comprises: a first resistor, a first end is configured to receive the data signal, and a second end of the first resistor is coupled The second end of the first resistor is coupled to the second end of the first resistor, and the second end of the second resistor is grounded. The liquid crystal television of claim 1, wherein the input signal detecting circuit comprises: a reverse amplifying circuit coupled to a first voltage source, wherein the reverse amplifying circuit is configured to receive a remote control signal to generate an amplification Signal; an integrating circuit for integrating the amplified signal to generate an integrated signal; a switching circuit comprising: a first transistor is coupled to the integrating circuit to receive the integrated signal, a first bias end of the first transistor is grounded, and one of the first transistors is second biased The voltage terminal is coupled to a second voltage source; and a second transistor has an input end coupled to the second bias end of the first transistor, and one bias end of the second transistor Is coupled to a third voltage source, and an output of the second transistor outputs an activation signal, wherein the startup signal is used to turn on a power supply included in a power board; and a self-holding circuit includes: a third transistor having an input coupled to the enable signal, a first bias terminal of the third transistor being grounded, and a second bias terminal of the third transistor coupled to the third transistor The input end of the second transistor. The liquid crystal television according to claim 9, wherein the first transistor and the third transistor are both npn-type bipolar junction transistors, and the second electro-crystal system is a pnp-type bipolar junction a crystal; wherein the input end of the first transistor is a base, the first bias end of the first transistor is an emitter, and the second bias end of the first transistor Is a collector pole; wherein the input end of the second transistor is a base, the bias end of the second transistor is an emitter, and the output end of the second transistor is a collector pole; and the input end of the third transistor is a base, the first bias end of the third transistor is an emitter, and the second bias of the third transistor Pressure The end system is a collector.