TW201113858A - Liquid crystal display power supplying circuit - Google Patents

Abstract

Under a sleep mode of a display, a liquid crystal display power supplying circuit prohibits power from a liquid crystal display power, and proceeds supplying power with a motherboard, which supplies power all the time, instead. Therefore, power of the liquid crystal display power under the sleep mode of the display is replaced by retrieving the power supplied from the motherboard instead, so that unnecessary power consumption of the liquid crystal display power under the sleep mode is prevented.

Description

201113858 VI. Description of the Invention: [Technical Field] [0001] The present invention discloses a display power supply circuit, and more particularly to a display power supply circuit that reduces power consumption. [Prior Art] [0002] A general-purpose liquid crystal display will save power consumption by entering a sleep mode, and supply a liquid crystal display in a normal operation mode and a required power supply in a sleep mode with a single display power supply. Be

[0003]

The components for supplying power mainly include a display panel, a microprocessor and an integrated circuit; and the power of the display is about 5 volts, the power required for the display panel is about 5 volts, and the power required by the microprocessor is about 3. 3 volts, and the power required to calculate the integrated circuit is about h 8 volts. Please refer to Figure 1 '' for a general LCD display power supply 1〇{). As shown in FIG. 1 , the liquid crystal display power supply circuit 1 includes a liquid crystal display power supply 110, a first power supply unit 150, a second power supply unit 160, a first filter module 17A, and a second filter mode. Group 18 〇 and - a polar body D120. The liquid crystal display power supply circuit 100 mainly supplies the power supply V01 (about 5 volts) directly outputted through the liquid crystal display power supply 110 to directly supply the required power supply of the display panel 12, and the electric power generated by the first power supply unit 150 is 2 ( Approximately 3. 3 volts is provided to provide the required power of the microprocessor 13 并 and the power generated by the second power supply unit 160 (about 8 volts) to provide the required power for the integrated circuit. = When you need to enter the sleep mode, the microprocessor sends a signal to notify the panel 12 and the minimum user can turn off the divergent integrated circuit 140, and close most of its own while maintaining the operating function. The function 098134703 form number A0101 page 3 / 31 page 0982059454-0 201113858 to stop receiving power supply V01, V02, V03 respectively; conversely, when the display needs to enter the normal operation mode from sleep state, it is also issued by the microprocessor 130 The signal notification display panel 120 and the arithmetic integrated circuit 140 are turned on to continue receiving the power sources V01, V02, and V03, respectively. However, when the display enters the sleep mode, there is still a relatively small current flowing through the diode D120, so that the liquid crystal display power supply 110 is in an inefficient operating state, and still consumes power that cannot be ignored. SUMMARY OF THE INVENTION [0004] The present invention discloses a liquid crystal display power supply circuit. The liquid crystal display power supply circuit comprises a motherboard switch circuit, a liquid crystal display power supply, a power switch circuit and a first power supply unit. One of the input circuits of the motherboard switching circuit is coupled to a power output of a motherboard. An input end of the power switch circuit is connected to the liquid crystal display power supply. The first power supply unit is coupled to an output end of the motherboard switch circuit, an output end of the power switch circuit, and a microprocessor for supplying power to the motherboard or the power of the liquid crystal display. microprocessor. [0005] The liquid crystal display power supply circuit disclosed in the embodiment of the present invention isolates the power supply of the liquid crystal display power supply in the sleep mode of the display, and changes the power supply in the sleep mode by the motherboard that needs to be powered at any time, so that the liquid crystal display The power supply would otherwise be consumed in the sleep mode of the display, but the power that does not need to be consumed will be passed on to the motherboard that would otherwise be powered, and the unnecessary power consumption of the LCD monitor power supply in sleep mode is saved. [Embodiment] 098134703 Form No. A0101 Page 4 of 31 0982059454-0 201113858 [0007] In order to solve the problem that power consumption that cannot be ignored in the sleep mode described in the above prior art, the present invention Embodiments disclose a display power supply circuit for reducing power consumption. The disclosed display power supply circuit mainly cuts off the power output of the liquid crystal display power supply when the display enters the sleep mode, and separately supplies the power supply of the display in the sleep mode by using the motherboard of the display. In this way, since the motherboard of the display itself provides power at any time, this feature can be used to pass the power consumed by the power supply of the liquid crystal display in the prior art to the output power of the motherboard which would otherwise be consumed, thereby preventing the liquid crystal. The display power consumes excess power. Please refer to FIG. 2 and FIG. 3 , which are schematic diagrams of a liquid crystal display power supply circuit 200 according to the first and second embodiments of the present invention. FIG. 2 is a liquid crystal display power supply circuit 200 according to the first embodiment. FIG. 3 is a schematic diagram of the liquid crystal display 200 disclosed in the second embodiment. As shown in FIG. 2, in the first embodiment, the liquid crystal display power supply circuit 200 includes a motherboard switch circuit 230, a power switch circuit 240, and the liquid crystal display power supply 110 shown in FIG. Power supply unit 150. The first power supply unit 150 is configured to supply the power of a motherboard or the power of the liquid crystal display power supply 110 to the microprocessor 130 through the motherboard switch circuit 230 or the power switch circuit 240. When the display enters the normal operation mode, the liquid crystal display power supply circuit 200 turns off the main board switch circuit 230 and turns on the power switch circuit 240, so that the power of the main board cannot be supplied to the first power supply unit 150 through the main board switch circuit 230. And make the liquid crystal display power supply power supply 110 can pass through the power switch circuit 240 098134703 Form No. A0101 Page 5 / Total 31 page 0982059454-0 201113858 : ': Micro processing is 13 〇. Similarly, when the display enters the sleep mode, =:=Γ circuit 2°° turns on the motherboard switch _ and turns off the 1 packet source switch circuit 240, so that the motherboard's lightning circuit 2 rich red m φ H through the motherboard The power supply to the first power supply unit 15A is turned on, and the power supply of the liquid crystal display voltage = power supply HG cannot be supplied to the first power supply unit 15 through the power supply switch circuit (10). [0009] [0010] 098134703

As shown in FIG. 3, in the second embodiment, the liquid crystal display power supply circuit 200 is disposed on the motherboard 21 (), and is used to provide the micro-device 130 shown in FIG. Wei Ug's three different potential power supplies. As shown in FIG. 3, the liquid crystal display power supply circuit 2 includes a motherboard switching circuit 23G, a power source circuit 24q, and a liquid shown in FIG. 1, a display power source 110, a first power supply unit 15A, and a second power supply unit. 160, the first-wave module m and the second wave module just.

In the normal operation mode of the display, the liquid crystal display power supply circuit 2 receives the power supply v〇1 from the liquid crystal display power supply 110 for the display panel to operate, and turns on the power switch circuit _, so that the power supply V01 can be input to the first The power supply unit 15G; at this time, the power supply VOS located at the input end of the first power supply unit 15A is generated according to the power supply V01, and the liquid crystal display power supply circuit 200 turns off the motherboard switch circuit 23A to isolate the motherboard board 210 from being generated. One of the motherboard outputs a supply of power v〇M. In this way, the first power supply unit 150 converts the power supply V0S into the power supply v〇2, and supplies it to the microprocessor 130 for operation, and the second power supply unit 16〇 generates the power supply V03 according to the power supply V02, and supplies it to the computing integrated body. Circuit 14〇. In the sleep mode of the display, the microprocessor 130 generates a control signal to turn off the transport integrated circuit 140 and the display panel 120, so that the form number A0101 is displayed at this time. Page 6 of 31 0982059454-0 [0011] 201113858 The panel 120 does not consume the power supply V01 supplied by the liquid crystal display power supply no. Furthermore, the liquid crystal display power supply circuit 200 turns off the power switch circuit 240 and turns on the motherboard switch circuit 230, so that the power supply v〇s received by the first power supply unit 150 is based on the motherboard output provided by the motherboard 21〇. The power supply VOM is generated instead of the power supply V01 supplied from the liquid crystal display power supply 11 此时. At this time, the liquid crystal display power supply 11 〇 is in a state of completely no power consumption, because the path of the power consumption is completely blocked. The purpose of saving the power of the LCD monitor in sleep mode. [0012] Please refer to FIG. 4, which is a schematic diagram of a liquid crystal display power supply circuit 200 shown in FIG. 2 according to a third embodiment of the present invention. Circle 4 primarily discloses the implementation of power switch circuit 240 and motherboard switch circuit 230 shown in FIG. As shown in FIG. 4, the motherboard switching circuit 230 includes a first diode D103', a resistor R103, a Zener diode _enar Di- ode, a ZD 102, and a capacitor C100. The first end of the first diode D103 is connected to the power output terminal of the motherboard 21 to receive the power output V0M of the motherboard. A first end of the resistor R103 is coupled to a second end of the first diode D103, and a second end of the resistor R1〇3 is coupled to a power input end of the first power supply unit 150. A first end of the Zener diode ZD102 is coupled to the power output of the motherboard 21, and a second end of the Zener diode ZD102 is grounded. The first capacitor ci is connected in parallel to the Zener diode ZD102. The power switch circuit 240 includes a second diode D101 and a third diode!)1〇2. The second diode!) One of the first terminals is connected to the liquid crystal display power supply 110. The first end of the third diode D102 is connected to one of the second ends of the second diode D101, and the third diode 098134703 Form No. A0101 Page 7 / Total 31 Page 0982545474-0 201113858 Body D1 02 The second end is switched to the power input of the first power supply unit (10). The Zener diode ZD1〇2 and the capacitor π〇〇 are mainly used to remove the noise from the power supply surface of the motherboard generated by the motherboard 21〇 [0013] [0014] The host shown in FIG. The mode of operation of the board switch circuit 23 and the power switch circuit state is as follows. When the display is in the normal operation mode, the m diodes di〇i and D102 are positively biased and thus turned on due to the power supply leg provided by the liquid crystal display power supply 11〇, so that the power supply open circuit 24 () is turned on. At this time, because the motherboard is in the normal mode, the board will generate a large current, so that the output power of the motherboard v〇M is transmitted through the second diode D103 and the resistor Ri〇3, at the resistance ^ (10) The voltage drop generated by more than one diode is generated; since the voltage drop across the diode is a fixed value, in other words, the power supply V01 will only be brought by the second and third diodes D101 and D102. The enthalpy of the two diodes is slaughtered, but the power supply VOS will encounter resistance R| in addition to the fixed voltage drop of the single diode brought by the first polar body D1..03. 3_h due to the larger current of the motherboard 21〇, a voltage drop greater than the fixed voltage drop of the single diode, so the first diode D103 is in a reverse bias state, so that the host board 21〇 provides the host The board output power source VOM is isolated from the voltage input terminal of the first power supply unit 15A. In short, the power supply VOS received by the first power supply unit 15 at this time is only provided by the power supply v 〇 1 provided by the liquid crystal display power supply 11 。. When the display is in the sleep mode, the motherboard 210 generates a small current, so the voltage drop generated on the resistor R103 will be smaller than the single-diode 098134703 Form No. A0101 Page 8 / Total 31 Page 0982545544-0 [ 0015] 201113858 Fixed voltage drop; in other words, the voltage drop encountered by the motherboard output power supply V0M only contains the fixed voltage drop of the single diode on the first diode D1 03 and • the resistor R103 is smaller than the single two One of the poles has a fixed pressure drop. Since the voltage drop encountered by the power supply VO1 provided by the liquid crystal display power supply 110 is still a fixed voltage drop brought by the two diodes D101 and D102, the second and third diodes D101 and D102 are at this time. The reverse bias state, and the first diode D103 is in the forward state 'so that the power switch circuit 240 is turned off' and the motherboard switch circuit 230 is turned on. In this way, in the sleep mode of the display, the power supply VOS received by the first power supply unit 150 is generated according to the motherboard output power v〇M provided by the motherboard 210. [0016] Please refer to FIG. 5, which is a schematic diagram of a liquid crystal display power supply circuit 2A shown in FIG. 2 according to a fourth embodiment of the present invention, and FIG. 5 mainly discloses a power switch in the fourth embodiment. A detailed implementation of the circuit 24 and the motherboard switch circuit 230. As shown in FIG. 5, the motherboard switching circuit 23 includes an N-type MOS transistor Qi, a first resistor R2 〇 3, and a second resistor R151. The power switch circuit 24 includes a diode D2, a type of metal oxide, and a gate and a gate are coupled to the power output of the motherboard 210 to receive the output of the motherboard. Power v〇M. The first end of the first resistor R2 〇3 is coupled to one of the drains of the N-type MOS transistor 91, and the second end of the first resistor R203 is coupled to the first power supply unit 15 Voltage input. The first end of one of the second resistors R151 is coupled to one of the bases of the N-type MOS transistor Q1, and the second end of the second resistor R151 is grounded. The first end of the diode D201 is coupled to the liquid crystal display power supply 11A, and the second end of the diode D201 is coupled to the voltage input end of the first power supply unit 150. Used to adjust the N-type gold oxygen 098134703 Form No. A0101 Page 9 / Total 31 page 0982594544-0 201113858 The bias current of the semi-transistor Q1. [0017] The operation mode of the power switch circuit 240 and the motherboard switch circuit 230 shown in FIG. 5 is as follows. [0018] When the display enters the normal operation mode, the motherboard 210 generates a large current, so that the motherboard output power VOM encounters a voltage drop greater than the single diode fixed voltage drop on the first resistor R203 ( Assuming that the voltage drop across the N-type MOS transistor Q1 is negligible, and the power supply V01 provided by the liquid crystal display power supply 110 encounters a fixed voltage drop of the single diode on the diode D201, the diode is now at this time. The D201 is in the forward direction and the N-type MOS transistor Q1 is turned off by the reverse bias. At this time, the power source VOS received by the first power supply unit 150 is generated according to the power source V01 provided by the liquid crystal display power source 110, and is not generated according to the motherboard output power source VOM provided by the motherboard 210. [0019] When the display enters the sleep mode, the motherboard 210 generates a small current, so that the motherboard output power VOM encounters a voltage drop of less than a single diode fixed voltage drop on the first resistor R203, and The power supply V01 provided by the liquid crystal display power supply 110 still only encounters the fixed voltage drop of the single diode on the diode D201, so the diode D201 is reverse biased at this time, and the N-type metal oxide semi-transistor Q1 will be The positive bias is turned on. At this time, the power supply VOS received by the first power supply unit 150 is generated according to the motherboard output power VOM provided by the motherboard 210, and is not generated according to the power supply V01 provided by the liquid crystal display power supply 110. [0020] Embodiments of the present invention additionally disclose switching a liquid crystal display 098134703 by actively switching one of a normal operation mode and a sleep mode of a display mode. Form No. A0101 Page 10 of 31 0982059454-0 201113858 Power supply or motherboard The central power supply of the liquid crystal display power supply circuit, wherein the liquid crystal display power supply Lei Yao ΟΛ The electric power supply of the liquid crystal display included in the electric jade road also needs to operate with the Ο [0021] Ο = number, in order to achieve the switch liquid crystal display " source Or the power supply mechanism of the host. Please refer to FIG. 6 and FIG. 7. FIG. 6 and FIG. 7 are schematic diagrams of a liquid crystal display power supply circuit 500 according to the present invention. FIG. 6 mainly discloses a power switch circuit 540 in the fifth embodiment. The detailed implementation of the motherboard switch circuit 530, and FIG. 7 is mainly disclosed in the fifth embodiment - the liquid crystal display power supply implementation, and the liquid crystal display power supply circuit 5GG shown in FIG. 6 and the liquid raft shown in FIG. The power supply 4i 0 needs to be controlled by a control signal 〇N/〇ff to trigger the switching power supply; the control signal (10)/qing is two potentials in the normal operation mode of the display, and the control signal (10)/ 〇fF is low during the sleep mode of the display. . As shown in FIG. 6, the liquid crystal display power supply circuit 500 includes first and second power supply units 150 and 16 and corresponding first and second chopper modules 170 and 180, and further includes a motherboard switch. The circuit 53A, the power switch circuit 540, and the liquid crystal display power supply 41 are provided. The motherboard switching circuit 53 includes a first npn-type bipolar junction transistor (Bip〇lar) (10) Bution Transistor, bjT) Q303, a second npn-type dual-substrate junction transistor Q302, and a first A diode D302, a capacitor C313 & _ resistor R356 ' and the power switch circuit 240 includes a second diode D3 〇 l. The collector of the first npn-type bipolar junction transistor q303 is coupled to the power output end of the motherboard 210 to receive the output power of the motherboard, and the base of the first ηρη-type bipolar junction transistor Q303 The pole is coupled to a control signal 0N/0FF to correspond to the difference of the control signal on/OFF (that is, the display 098134703 form number Α 0101 page 11 / total 31 page 0982059454-0 201113858 no sleep mode and normal operation mode Different) to change its open state. The collector of the second npn-type bipolar junction transistor Q3〇2 is coupled to the base of the first npn-type bipolar junction transistor q3〇3, and the second 双 type bipolar junction The emitter of transistor Q302 is grounded. One end of the first diode D3〇2 is coupled to the emitter of the first npn-type bipolar junction transistor Q3〇3, and the second end of the first diode D302 is coupled The voltage input terminal of the first power supply unit 15G. The first end of the resistor is connected to the collector of the first npn-type bipolar junction transistor Q303, and the second end of the resistor "56" is coupled to the first npn-type bipolar junction The transistor is the base of the 〇3. The capacitor G313H is coupled to the second end of the second diode 2 and the second end of the capacitor C313 is connected to the second npn bipolar transistor. The emitter of Q302. The first end of the second diode & 3〇1 is coupled to the liquid crystal display power supply 11〇 to receive the power supply v〇1, and the second end of the second diode D301 is coupled. The first power supply unit 410 includes a first switch module 460, a first power conversion module 43Q, a second switch module, and the like. A power supply unit 450 and a second power conversion module 42. The input end of the first switch module 460 is connected to the power output end of the motherboard 21, that is, the power supply PC5V in FIG. The power supply PC5V is received by the motherboard 21〇. The first switch module 460 is used to determine whether the power supply PC5V is generated according to the control signal 〇N/〇FF--the power supply VP1' The device is in a sleep mode or a normal operation mode to determine whether to generate the power source VP1. In other words, the first switch module 46 0 is a switch that determines whether to turn on the power source Vp i. One input coupling of the first power conversion module 430 Connected to one of the output terminals of the first switch module 460. When the first power conversion module 43 receives the 098134703 form number A0101 page 12 / a total of 31 pages 0982545544-0 201113858 power supply VPl to make the first power conversion mode When a positive potential difference is generated between the input terminal si of the group 43 and a grounded input terminal S2, one of the output terminals S3 of the first source converter module 430 and one of the grounded input terminals S4 are turned on. One of the group 480 is coupled to the output S3 of the first source conversion module 430, and the second switch module 480 is externally connected to the DC power supply VDD. The second switch module 48 is based on the first Whether the output terminal S3 and S4 in the power conversion chess set 430 is turned on, and generates a power source vp3 according to the source of the straight machine, in other words, the second switch module 480 is a switch for determining whether to output the power source VP3; In an embodiment of the invention A transistor may be disposed between the output terminals S3 and S4, and the power system controls whether the conduction is conducted according to whether there is a potential difference between the input terminals S1 and S2 to generate an on current between the output terminals S3 and S4. One of the power supply unit 450 is connected to one of the second switch module 480. When the power supply VP3 received by the switch control terminal is at a potential, the power supply unit 450 is not required. The power supply VCC0; when the power supply vp3 received by the switch control terminal P〇wer is at a low level, the power supply unit 4 5 does not supply the power supply vcc. One of the input terminals of the second power conversion module 420 is coupled to the power supply unit. One output of 45 ,, and one output of the second power conversion module 420 is coupled to the output end of the liquid crystal display power supply 410 shown in FIG. 6, and the second power conversion module “o” converts the power supply VCC0 The power supply VCC5V shown in FIG. 6 is used to output the power supply VCC5V to the output terminal of the liquid crystal display power supply 41A and supply it to the power supply switching circuit 540. The first switch module 460 includes a pnp type bipolar junction transistor q8〇1 and a resistor R847. PnP type double carrier junction transistor Q801 one emitter 098134703 Form No. A0101 Page 13 of 31 0982059454-0 201113858 is coupled to the power supply output of the motherboard 21 以 to receive the power supply pC5v, and pnp type double One of the bases of the carrier junction transistor Qgoi is lightly connected to the control signal ΟΝ/OFF. The first end of the resistor R847 is connected to the collector of the pnp type bipolar contact electrical aa body Q801, and the second end of the resistor R847 is connected to the input terminal si of the first power conversion module 430. The second switch module 48 includes an npn type bipolar junction transistor Q802 and two resistors R804 and R805. One of the npn-type bipolar junction transistors q802 is connected to the DC power supply VDD, and one of the npn-type bipolar junction transistors Q802 is coupled to the switching control terminal of the power supply unit 450. . The first end of the resistor R804 is coupled to the output end S3 ′ of the first power conversion module 43 且 and the second end of the resistor R 804 is coupled to a base of the npn-type bipolar junction transistor Q802 . The first end of the resistor 8805 is coupled to the second end of the resistor R8 04, and the second end of the resistor R80 5 is coupled to the collector of the npn-type bipolar junction transistor Q802. [0024] The operation mode of the power switch circuit 540 and the motherboard switch circuit 530 shown in FIG. 6 is explained in conjunction with the liquid crystal display power supply 410 shown in FIG. When the display enters the normal operation mode, the control Ιίί ΟΝ/OFF is a high potential signal, so that the second npn type bipolar junction transistor Q302 is turned on, and the first npn type bipolar junction transistor Q303 The on current of the second npn-type bipolar junction transistor Q302 is turned off and its base potential is turned off. As a result, the remaining potential of the power supply PC5V to the input end of the first power supply unit 150 is lower than the remaining potential of the power supply VCC5V to the input end of the first power supply unit 150, so that the power supply V0S is opposite to the first two poles. The body D302 generates a reverse bias so that the power supply PC5V provided by the motherboard 210 will be isolated from the first power supply unit 150, and by the liquid crystal 098134703, the form number A0101, page 14 of 31, 098,205,945,044, 201113858 显示器 the display power supply 410 The supplied power source ¥(^5¥ generates the power source VOS through the second diode 0301 and supplies it to the first power supply unit 150. At the same time 'in the liquid crystal display power source 410, since the control signal 0N/0FF is high Therefore, the pnp type bipolar junction transistor Q801 is turned off, and thus the power supply VP1 shown in Fig. 7 cannot be generated. Since the first power conversion module 430 does not receive the power supply VP1, the first power conversion The output terminals S3 and S4 of the module 430 are not turned on to generate a current; thus, the npn bipolar junction transistor Q802 is not caused by the current between the output terminals S3 and S4. Pulling down the potential of its base, so that the npn bipolar junction transistor Q802 is in an on state, and the power supply VP3 is at a high potential. After receiving the power supply VP3 at a high potential, the power supply unit 450 supplies power according to the power supply unit 450. VCC0 is supplied to the second power conversion module 420, and the power supply VCC5V is finally generated, and the power supply VCC5V is supplied to the power switch circuit 540 shown in Fig. 6. [0025] 控制 When the display enters the sleep mode, the control signal ΟΝ/ OFF will be at a low potential, so that the second npn-type bipolar junction transistor Q302 is turned off, and the first npn-type bi-carrier junction transistor Q303 will be turned on because the base potential is not pulled low. First, since the residual potential when the power source PC5V is transmitted to the first power supply unit 150 is higher than the residual potential when the power source VCC5V is transmitted to the first power supply unit 150, the power supply V0S reverse biases the second diode D301. The power supply VCC5V supplied from the liquid crystal display power supply 410 is isolated from the first power supply unit 150, and the power supply PC5V supplied from the motherboard 210 generates the power supply v〇S and supplies it to the first power supply unit 150. In the crystal display power supply 410, the pnp type bipolar junction transistor Q801 is turned on by the low potential control signal (10)/OFF of the base 098134703, Form No. A0101, Page 15 of 31, 0982594544-0, 201113858. The first-switch module generates a high-potential power supply VH on the input of the first-power conversion module 430. The first-power conversion module 430 will make the first-power conversion mode according to the high-potential power supply vpi. The output of group 430 is turned on between S3 '84. In the second switch module, the base of the npn-type bipolar junction transistor Q8〇2 is pulled low due to the conduction current between the output terminal and the conduction current between S4, and further the N-type dual carrier junction The transistor Q802 is turned off, so the power source VP3 outputted by the second switch module_2 is low at this time. After the power supply unit 45's switch control terminal Power receives the low-level power supply m, it will stop supplying the power supply vcco. Therefore, the second power conversion module 42Q cannot generate the power supply 〇VCC5V, so that the liquid crystal display power supply in FIG. 41〇 can also provide power supply VCC5V to the power switch circuit 54〇β [0026] [0027] By means of the control signal 〇N / 〇 FF in Figure 6 and Figure 7 according to the normal operating mode of the display and sleep mode In order to isolate the power supply to be isolated from the power supply path in a reverse bias manner as in the previous embodiments, the power supply circuit of the liquid crystal display can be further ensured by the power supply of the power supply 410. 500 power consumption in sleep mode. The embodiment of the present invention discloses that the money crystal display is powered by the electric power (4), and the power supply of the liquid crystal display 11« is isolated in the sleep mode of the display, and is changed by the motherboard that needs to be powered at any time to perform the sleep mode. The display power supply will be consumed in the sleep mode of the display, but the power that is not consumed will be passed on to the original (4) the motherboard (f) that is powered at any time. This saves the unnecessary power consumption of the liquid crystal display power supply in the sleep mode. 098134703 Form No. A0101 Page 16 of 31 098205945-4-0 201113858 [0028] Although the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the skilled artisan will not In the spirit and scope of the invention, the scope of the invention is to be determined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS [0029] FIG. 1 is a schematic diagram of a power supply circuit of a general liquid crystal display. [0030] FIG. 2 and FIG. 3 are respectively a schematic diagram of a liquid crystal display power supply circuit disclosed in the first and second embodiments of the present invention; wherein the liquid crystal display power supply circuit is coupled to the motherboard, and is used to provide The power supply of the three different potentials of the microprocessor, the display panel and the arithmetic integrated circuit shown in FIG. 4 and FIG. 5 are schematic diagrams showing the power supply circuit of the liquid crystal display shown in FIG. 2 according to the third and fourth embodiments of the present invention. 6 and FIG. 7 are schematic diagrams showing a power supply circuit of a liquid crystal display according to a fifth embodiment of the present invention, wherein the power supply circuit of the liquid crystal display shown in FIG. 6 and the power supply of the liquid crystal display shown in FIG. 7 are controlled by a control unit. The signal controls the mechanism for switching power. [Main component symbol description] [0033] 100, 200, 500: Liquid crystal display power supply circuit [0034] 11 0, 41 0 : Liquid crystal display power supply [0035] 1 2 0 : Display panel [0036] 130: Microprocessor [0037 140: arithmetic integrated circuit 098134703 Form No. A0101 Page 17 of 31 098205945-4-0 201113858 [0038] 150, 160, 450: power supply unit [0039] [0041] [0043] [0043] [0049] [0049] [0049] 170, 180: filter module 210: motherboard diode 2 3 0, 5 3 0: motherboard switch circuit 2 4 0, 5 4 0 : Power switch circuit 420, 430: power conversion module 460, 480: switch module D101, D102, D103, D201, D301, D302: ZD102: Zener diode C100, C313: capacitor resistance

Ql, Q302, Q303, Q8 (H, Q802: transistor R151, R203, R356, R847, R805, R804 098134703 Form No. A0101 Page 18 of 31 0982059454-0

Claims (1)

201113858 VII, the scope of application for patents: 1 - a liquid crystal display power supply circuit * contains. A motherboard switch circuit, one of the input terminals are coupled to a power supply output of a motherboard; - LCD display is not power, a The power switch circuit has an input end coupled to the liquid crystal display power supply; and a first power supply unit coupled to one of the output terminals of the motherboard switch circuit, one output end of the power switch circuit, and a micro processing And supplying power to the microprocessor or the power supply of the liquid crystal display to the microprocessor. 2. The liquid crystal display power supply circuit of claim 1, wherein when a display enters a normal operation mode, the motherboard switch circuit is turned off, and the power switch circuit is turned on, so that the liquid crystal display power supply The power source is supplied to the first power supply unit through the power switch circuit. 3. The liquid crystal display power supply circuit of claim 1, wherein, when a display enters a sleep mode, the motherboard switch circuit is turned on, and the power switch circuit is turned off, so that the motherboard is A motherboard output power is supplied to the first power supply unit through the motherboard switch circuit. 4. The liquid crystal display power supply circuit of claim 1, wherein the motherboard switching circuit comprises: a first diode, a first end of which is coupled to the power output of the motherboard And a first end of the resistor coupled to the second end of the first diode, 098134703 Form No. A0101, page 19/31, 098205945-4-0, 201113858, and one of the second ends of the resistor The system is coupled to the first power supply unit. 5. The liquid crystal display power supply circuit of claim 4, wherein the motherboard switching circuit further comprises: a Zener diode, a first end of which is consumed by the motherboard The power output end, and the second end of the Zener diode is grounded; and a first capacitor is connected in parallel to the Zener diode. 6. The liquid crystal display power supply circuit of claim 4, wherein the power switch circuit comprises: a second diode, a first end of which is coupled to the liquid crystal display power supply; The first end of the third diode is coupled to the second end of the second diode, and the second end of the third diode is coupled to the first power supply unit. 7. The liquid crystal display power supply circuit of claim 1, wherein the motherboard switching circuit comprises: an n-type MOS transistor, wherein a source and a gate are coupled to the host a first output of the first resistor is coupled to one of the n-type MOS transistors, and the second end of the first resistor is coupled to the first end The first power supply unit. 8. The liquid crystal display power supply circuit of claim 7, wherein the motherboard switching circuit further comprises: a second resistor, a first end of which is coupled to the n-type MOS transistor a base, and one of the second ends of the second resistor is grounded. 9. The liquid crystal display power supply circuit according to claim 7, wherein 098,134,703 form number Α0101, page 20/total 31 page, 098,205,945,044, and 201113858, the power switch circuit includes: a fourth pole 胄---end system The liquid crystal display power supply circuit of the liquid crystal display power supply, wherein the second power supply is connected to the liquid crystal display power supply circuit, and the liquid crystal display power supply circuit according to claim 1, wherein the host The board switch circuit includes: Ο a first npn-type bi-carrier junction transistor, the collector is coupled to the power output end of the motherboard, and the first-type dual-carrier junction transistor The base is coupled to a control signal; a second npn-type dual-carrier silicon transistor is coupled to the base of the first npn-type bipolar junction transistor and the second An emitter of the npn-type bipolar junction transistor is grounded; and a fifth diode is coupled to the emitter of the first npn-type bipolar junction transistor, and the first end is coupled to the emitter of the first npn-type bipolar junction transistor a second end of the fifth diode is consumed by the first power supply unit; When 'when entering a sleep mode' comprises the display monitor circuit potential of one of the supply lines of the control signal is a low voltage. 11. The liquid crystal display power supply circuit of claim 10, wherein the main board switch circuit further comprises: a first end of the resistor connected to the first npn type double carrier junction transistor a collector, and a second end of the resistor is coupled to the base of the first npn-type bipolar junction transistor; a first end of the electric valley is coupled to the fifth diode The second end of the capacitor is coupled to the emitter of the second npn-type bipolar transistor. 098134703 12. The liquid crystal display power supply circuit according to claim 10, wherein the form number A0101 page 21/total 31 page 0982059454-0 201113858 'The power switch circuit system includes: display power supply, power supply unit first a liquid crystal display power supply circuit according to claim 10, wherein a first end is coupled to the liquid crystal and a second end of the sixth diode is connected to the first 13 Wherein the liquid crystal display power supply comprises: a first switch module, wherein the wheel terminal is connected to the power output end of the motherboard, and the first-off mode (4) is used to determine whether the host is based on the control signal. The first power supply is generated by the first power supply, and the first power conversion module is based on the first power conversion module. Whether the second power source is at a potential to conduct current between the _th-output terminal and the second output terminal; a second switch module s-the input terminal is coupled to the first power-conversion module - output, the second open The module (4) is configured to generate a third power source according to whether the first output terminal of the first power conversion module generates an on current between the second output terminal; - the second power supply unit 'the control terminal wire Connected to the output terminal of the second switch module, the second power supply unit generates a fourth power source according to whether the third power source is at a high potential; and 098134703 14 . The second power conversion module The input end is connected to the output end of the second power supply unit, and the output end of the second power conversion module is connected to the output end of the power supply circuit, and the second power conversion module The fourth power source is converted to a fifth power source, and the fifth power source is output to the output end of the power switch circuit. For example, the liquid crystal (four) power supply circuit described in claim 13 (4), wherein the form number A0101, page 22 / total 31 pages 0 892 514 945 - 201113858 'The first switch module includes: a Ρρ type double carrier junction transistor The emitter is reduced to the power output of the motherboard, and one of the bases of the pnp-type dual-carrier transistor is coupled to the control signal; and the first end of the first resistor is Connected to the collector of the pnp type bipolar junction transistor and the second end of the first resistor is lightly connected to the first power conversion module. 15 . The liquid crystal display power supply circuit of claim 13, wherein the second switch module comprises: a first ηρη type bipolar junction transistor, a collector thereof The first ηρη type bipolar contact transistor is coupled to the switch control end of the second power supply unit; the first resistor has a first end surface Connected to the first output end of the first power conversion module, and one of the second resistors is coupled to one of the bases of the third ηρη type bipolar junction transistor; The second resistor is coupled to the second end of the second resistor, and the second end of the third resistor is coupled to the third ηρη-type bipolar junction transistor Collective. The liquid crystal display power supply circuit of claim 1, further comprising: a first filter module for filtering noise contained in a power source received by the power supply unit. The liquid crystal display power supply circuit of claim 1, wherein a display panel is coupled to the liquid crystal display power supply, the microprocessor is coupled to the first power supply unit to receive the first power supply The unit provides one of the first output power sources. 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 Converting to a second output power supply for supplying an integrated circuit of the display; and a second filter module for filtering noise in the second output power source processed by the second power supply unit . 098134703 Form No. A0101 Page 24 of 31 0982059454-0