WO2000041028A1 - Dispositif d'affichage a cristaux liquides, dispositif electronique et alimentation servant a faire fonctionner ledit dispositif d'affichage a cristaux liquides - Google Patents
Dispositif d'affichage a cristaux liquides, dispositif electronique et alimentation servant a faire fonctionner ledit dispositif d'affichage a cristaux liquides Download PDFInfo
- Publication number
- WO2000041028A1 WO2000041028A1 PCT/JP2000/000038 JP0000038W WO0041028A1 WO 2000041028 A1 WO2000041028 A1 WO 2000041028A1 JP 0000038 W JP0000038 W JP 0000038W WO 0041028 A1 WO0041028 A1 WO 0041028A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- liquid crystal
- voltages
- power supply
- type
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
Definitions
- the present invention relates to a liquid crystal driving power supply device for driving a liquid crystal device, and a liquid crystal device and an electronic apparatus using the same.
- JP-A 6-3 24640 How to reduce current consumption in the conventional liquid crystal driving power supply, JP-A 6-3 24640, it is disclosed in JP-A-7- ninety-eight thousand five hundred seventy-seven N Hei 9 one 43568 and the like.
- FIG. 7 shows an example of a conventional power supply for driving a liquid crystal.
- the liquid crystal driving power supply device 701 shown in FIG. 7 includes a voltage dividing circuit 702, two first impedance conversion circuits 703, and two second impedance conversion circuits 704.
- the voltage dividing circuit 702 includes resistance elements 706 to 710, divides the voltage between the power supply voltage VDD and the liquid crystal driving reference voltage V LCD and generates multi-valued voltages V1 to V4. From the power supply, if the power supply voltage VDD is V0 and the liquid crystal drive reference voltage VLCD is V5, the voltages V0 to V5 including these are the scan electrodes (also called common electrodes) COM0, COM1 shown in Fig. 13. 5 Form various voltage levels of the liquid crystal drive waveform supplied to COMX and the signal electrodes (also called segment electrodes) SEG 1 to 4 shown in FIG.
- the first impedance conversion circuit 703 is formed by voltage follower connection of an operational amplifier including a constant current circuit 801, a P-type differential amplifier circuit 802, and an output circuit 803. You.
- the N-type transistor 805 in the output circuit 803 forms a current source when a constant bias voltage is applied from the constant current circuit 801, and forms a load for the P-type transistor 804.
- the characteristic of the first impedance conversion circuit 703 that generates the voltages VI and V3 is that the charge at the scan electrode (common electrode) or signal electrode (segment electrode) to which the voltage V1 or V2 is supplied is It is determined in consideration of the moving direction. That is, as shown by reference numeral 1102 in FIGS.
- the amount of charge that needs to be transferred from the first impedance conversion circuit 703 to the electrode is larger for the positive polarity. is there. For this reason, in the first impedance conversion circuit 703, the P-type transistor 804 that allows current to flow to the electrode is used as an active element.
- the second impedance conversion circuit 704 must be a voltage follower-connected operational amplifier having a constant current circuit 91, an N-type differential amplifier circuit 902, and an output circuit 903 as shown in FIG. Formed by The P-type transistor 904 in the output circuit 903 forms a current source when a constant bias voltage is applied from the constant current circuit 901, and forms a load of the N-type transistor 905. I have.
- the characteristics of the second impedance conversion circuit 704 that generates the voltages V 2 and V 4 also depend on the charge at the scan electrode (common electrode) or signal electrode (segment electrode) to which the voltage V 2 or V 4 is supplied. Is determined in consideration of the moving direction of the vehicle. That is, as indicated by reference numeral 201 in FIGS.
- the amount of charge that needs to be transferred from the second impedance conversion circuit 704 to the electrode is greater for the negative polarity. It is. Therefore, in the second impedance conversion circuit 704, the N-type transistor 905 that draws current from the electrode is used as an active element.
- the voltages V1 and V3 are respectively input to the + terminals of the two first impedance converting circuits 703, V2 and V4 are input to the + terminals of the two second impedance conversion circuits 704, respectively.
- impedance conversion of each of the voltages V1 to V4 is performed, and liquid crystal driving voltages V1 to V4 are generated.
- the current flows to the load transistor.
- capacitor elements 705 have a large capacity, they have to be externally provided outside the liquid crystal driving power supply device.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid crystal driving power supply device capable of reducing current consumption, a liquid crystal device using the same, and an electronic device using the same. To provide equipment.
- Another object of the present invention is to provide a power supply device for driving a liquid crystal, which can save components such as a capacitor element while maintaining display quality, and a liquid crystal device and an electronic apparatus using the same.
- the liquid crystal drive power supply device of the present invention that generates N liquid crystal drive voltages between the first and second reference voltages is
- N pairs of first and second N voltages each including N first voltages equal to or higher than the N liquid crystal driving voltages and N second voltages equal to or lower than the N liquid crystal driving voltages.
- a voltage dividing circuit that divides a voltage between the first and second reference voltages by generating a voltage (a first voltage divided by a second voltage in each pair);
- N impedance conversion circuits that generate the N liquid crystal drive voltages subjected to impedance conversion based on the N pairs of first and second voltages
- Each of the N impedance conversion circuits includes: A voltage-follower-type differential amplifier circuit to which a pair of first and second voltages of the N pairs of first and second voltages are input;
- a P-type transistor and an N-type transistor connected in series between a first power supply line for supplying the first reference voltage and a second power supply line for supplying the second voltage;
- An output circuit that outputs the liquid crystal driving voltage from an output terminal connected between the transistor and the N-type transistor;
- the N-type transistor is on / off controlled by the first output voltage from the differential amplifier circuit
- the P-type transistor is on / off controlled by the second output voltage from the differential amplifier circuit.
- the first and second output voltages different from each other are output from the voltage follower type differential amplifier to which the first and second voltages different from each other are input.
- the liquid crystal drive voltage can be generated by independently controlling the N-type and P-type transistors of the output circuit on and off with the first and second output voltages.
- the differential amplifier circuit turns on the N-type transistor when the output voltage of the output terminal is higher than the first voltage, and turns on the P-type transistor when the output voltage of the output terminal is lower than the second voltage.
- both the P-type and N-type transistors can be turned off. In this way, it is possible to prevent both the P-type and N-type transistors from being turned on, thereby preventing a through current flowing through the P-type and N-type transistors, and achieving a low current.
- the P-type and N-type transistors of this output circuit can be set to have substantially the same current drive capability.
- the polarity of the amount of charge moving from the electrode of the liquid crystal panel to be driven to the impedance conversion circuit is either positive or negative, it can be quickly converged to the liquid crystal driving voltage.
- a sufficient load current can be secured without connecting a capacitor element.
- an N-type or P-type transistor will be By supplying the required amount of electric charge to the seat, noise immunity is improved and display quality can be improved.
- the voltage dividing circuit makes a potential difference between each pair of the first and second voltages variable. This is because it can deal with the characteristics of the differential amplifier, especially the variation in the offset of the input / output voltage.
- At least one of the N impedance conversion circuits sets the first voltage of the pair of first and second voltages to be substantially equal to the N liquid crystal drive voltages. Can be.
- a liquid crystal drive power supply device as described above A liquid crystal drive power supply device as described above;
- a liquid crystal panel on which scanning electrodes and signal electrodes are formed is formed,
- a scanning electrode driving circuit that receives power supply from the liquid crystal driving power supply device and drives the scanning electrodes
- a signal electrode drive circuit that drives the signal electrode by receiving power supply from the liquid crystal drive power supply device
- An electronic device includes the liquid crystal device.
- FIG. 1 is a circuit diagram of a power supply device for driving a liquid crystal according to an embodiment of the present invention.
- FIG. 2 is a circuit diagram using a resistive element in the voltage dividing circuit shown in FIG.
- FIG. 4 is a circuit diagram of a circuit example shared by the first and second impedance conversion circuits of FIG.
- FIG. 5 is a circuit diagram showing another example of the first impedance conversion circuit of FIG.
- FIG. 6 is a circuit diagram showing another example of the second impedance conversion circuit of FIG.
- FIG. 7 is a circuit diagram showing a conventional power supply device for driving a liquid crystal.
- FIG. 8 is a circuit diagram of the conventional first impedance conversion circuit shown in FIG.
- FIG. 9 is a circuit diagram of the conventional second impedance conversion circuit shown in FIG.
- FIG. 10 is a characteristic diagram showing an output waveform of an output terminal of the impedance conversion circuit of FIG.
- FIG. 11 is a characteristic diagram illustrating an output waveform of an output terminal of the first impedance conversion circuit in FIG.
- FIG. 12 is a characteristic diagram showing an output waveform of an output terminal of the second impedance conversion circuit of FIG.
- FIG. 13 is a waveform diagram of a liquid crystal driving waveform supplied to the scanning electrode.
- FIG. 14 is a waveform diagram of the liquid crystal drive waveform supplied to the signal electrode.
- FIG. 15 is a circuit diagram showing a basic configuration of the first and second impedance conversion circuits shown in FIG.
- FIG. 16 is a circuit diagram showing a circuit example in which the first and second voltages of the impedance conversion circuit shown in FIG. 15 are shared.
- FIG. 17 is a characteristic diagram showing characteristics of the CMOS inverter.
- FIG. 18 is a characteristic diagram showing an example of the ON / OFF characteristics of the P-type and N-type transistors in the output circuit of the power supply device for driving a liquid crystal according to the embodiment of the present invention.
- FIG. 19 is a block diagram of the liquid crystal device according to the embodiment of the present invention.
- the output circuit 130 includes a P-type transistor 132 and an N-type transistor 134 connected in series between a first power supply line 105 for supplying the power supply voltage VDD and a second power supply line 106 for supplying the liquid crystal driving reference voltage VLCD. And Output terminal OUT is connected between P-type and N-type transistors 132 and 134.
- First voltages (+ NV1) to (+ NV4) and N 4 first voltages Divide and generate the voltage of (+ PV1) to (+ PV4).
- FIG. 16 shows a configuration in which the output of the P-type differential amplifier circuit 110 and the output of the N-type differential amplifier circuit 120 shown in FIG. 15 have the same voltage, that is, a pair of input signals to the impedance conversion circuit shown in FIG. An equivalent circuit in the extreme state where the first and second voltages are both equal. is there.
- the output of the P-type differential amplifier circuit 110 and the output of the N-type differential amplifier circuit 120 are short-circuited, and the P-type and N-type transistors 132 and 134 are driven by the same short-circuited voltage. .
- the absolute value of the first offset voltage which is the difference between the input and output voltages of the N-type differential amplifier circuit 110
- I V0FFS ETN I the absolute value of the second offset voltage
- I VOFFSETP I the absolute value of the second offset voltage
- VN—VP NV1—I VOFFSETN
- VOFF SETP I)> 0 the output circuit 130 of FIG.
- the P-type and N-type transistors 132 and 134 may be turned on at the same time.
- the resistance values R 2, R 4, R 6, and R 8 of the four second resistance elements 202 are given by Equation (7), where VDD-V LCD-to-LCD voltage is VOP, and the sum of the resistance values R 1 to R 9 is Rt.
- the negative input terminals of the P-type differential amplifier 402 and the N-type differential amplifier 403 are connected to each other, and a pair of first and second voltages are applied to each positive input terminal (+ N, + P). It is applied independently.
- the output voltage of the P-type differential amplifier circuit 402 is applied to the gate of the P-type transistor 405 of the output circuit 404, and the power supply voltage VDD is supplied to its source.
- the output voltage of the N-type differential amplifier circuit 403 is applied to the gate of the N-type transistor 406 of the output circuit 404, and the liquid crystal driving reference voltage VLCD is supplied to the source.
- the drains of the P-type transistor 405 and the N-type transistor 406 are connected, and the output terminal OUT is connected thereto.
- FIG. 10 shows an output waveform of the output terminal OUT of the impedance conversion circuit 400 shown in FIG.
- the output circuit 404 in FIG. 4 connects the output terminal OUT with a voltage follower so that the N-type differential amplifier circuit 403 connects the input voltage to its + N terminal (+ NV 1 )
- the N-type transistor 406 is turned on with the above voltage, and the P-type differential amplifier circuit turns on the P-type transistor 405 with a voltage equal to or less than the input voltage (+ PV1) to the + P terminal.
- both the P-type transistor 405 and the N-type transistor 406 During the period during which the voltage is not operating (OFF period) 1003, the voltage V1 between the voltage (+ NV1) and the voltage (+ PV1) determined by the voltage follower connection appears at the output terminal 0 UT, and the output circuit The state in which the maximum through current does not occur as 404 can be maintained.
- the voltage at the output terminal OUT may exceed the voltage (+ NV1) due to fluctuations in the potential of the electrode on the liquid crystal panel to be driven (see reference numeral 1001 in FIG. 10).
- the voltage at the negative input terminal of the impedance conversion circuit 400 since the voltage at the negative input terminal of the impedance conversion circuit 400 also increases, the output voltage of the N-type differential amplifier circuit 403 increases, and the N-type transistor 406 turns on. As a result, the voltage of the output terminal OUT is reduced to (+ NV1) or less (state of 1001 in FIG. 10).
- the N-type transistor 406 When the voltage at the output terminal OUT becomes equal to the input voltage (+ NV1) to the + N terminal, the N-type transistor 406 is turned off and converges to the voltage V1 between the voltages NV1 and PV1.
- the voltage at the output terminal OUT may fall below the voltage (+ PV1) due to the potential fluctuations of the electrodes on the LCD panel to be driven (see reference numeral 1002 in FIG. 10).
- the voltage of the negative input terminal of the impedance conversion circuit 400 since the voltage of the negative input terminal of the impedance conversion circuit 400 also decreases, the output voltage of the P-type differential amplifier circuit 402 decreases, and the P-type transistor 407 turns on. As a result, the voltage of the output terminal OUT is raised to (+ PV1) or more (the state of 1002 in FIG. 10).
- the P-type transistor 407 turns off and converges to the voltage V1 between the voltages NV1 and PV1.
- FIG. 5 is a circuit diagram showing another example of the first impedance conversion circuit 103 of FIG.
- the first impedance conversion circuit 103 includes a constant current circuit 501, a P-type differential amplifier circuit 502, an N-type differential amplifier circuit 503, and an output circuit 504. And common.
- the output circuit 50 4 also has a P-type transistor 505 and an N-type transistor 506 in common with the impedance conversion circuit 400 shown in FIG.
- the difference from the circuit of FIG. 4 is that an N-type transistor 507 is connected between the output terminal OUT and the second power supply line 106.
- the output voltage of the constant current circuit 501 is applied to the gate of the N-type transistor 507.
- the N-type transistor 507 is a transistor whose constant current amount is reduced as much as possible.
- FIG. 6 is a circuit diagram showing another example of the second impedance conversion circuit 104 of FIG.
- the second impedance conversion circuit 104 includes a constant current circuit 61, a P-type differential amplifier circuit 602, an N-type differential amplifier circuit 603, and an output circuit 604. This is common to the impedance conversion circuit 400 shown in FIG.
- the output circuit 604 also has a P-type transistor 605 and an N-type transistor 606 in common with the impedance conversion circuit 400 shown in FIG.
- the difference from the circuit in FIG. 4 is that a P-type transistor 607 is connected between the first power supply line 105 and the output terminal OUT.
- the output voltage of the constant current circuit 601 is applied to the gate of the P-type transistor 607.
- the P-type transistor 607 is a transistor whose constant current amount is reduced as much as possible.
- FIG. 11 is a diagram showing an output waveform of the output terminal OUT of the impedance conversion circuit 103 of FIG.
- Reference numeral 1101 denotes the operation period of the N-type transistor 506, reference numeral 1102 denotes the operation period of the P-type transistor 505, reference numeral 1103 denotes the P-type and N-type transistors 505, The reference numeral 1104 represents the operating period of the N-type transistor for constant current 507 (stable period), and the reference numeral 1105 represents the operating period of the N-type transistor 507 for constant current ( Transition period).
- the basic operation of the first impedance conversion circuit 103 shown in FIG. 5 is the same as the basic operation of the impedance conversion circuit 400 shown in FIG. 4, but the N-type transistor 507 is fixed. The only difference is that the circuit operates according to the output of the current circuit 501. That is, P In a period (off period) 1104 in which both the type transistor 505 and the N-type transistor 506 are not operating (OFF period), the N-type transistor 507 with the constant current amount as small as possible is operating. As a result, the voltage at the output terminal OUT of the first impedance conversion circuit 103 is held at the voltage V1 or V3 shifted to the input voltage (+ PV1) or the input voltage (+ PV3) (the reference numeral in FIG. 11). 1104 state).
- the voltage of the output terminal OUT may be higher than the voltage (+ NV1) or (+ NV3) due to the fluctuation of the potential of the electrode on the driven liquid crystal panel side (FIG. 11).
- the voltage of the negative input terminal of the first impedance conversion circuit 103 since the voltage of the negative input terminal of the first impedance conversion circuit 103 also increases, the output voltage of the N-type differential amplifier circuit 503 increases, and the N-type transistor 506 turns on. As a result, the voltage of the output terminal OUT is reduced to the voltage (+ NV1) or (+ NV3) or less (state 1101 in FIG. 11).
- the P-type transistor 505 turns off, and the N-type transistor 507 operates during the stable period to output.
- the voltage at terminal OUT is maintained at the voltage (+ PV1) or (+ PV3).
- the basic operation of the second impedance conversion circuit 104 shown in FIG. 6 is the same as the basic operation of the impedance conversion circuit 400 shown in FIG. 4, but the P-type transistor 607 operates by the output of the constant current circuit 601. Only the point is different.
- the N-type transistor 606 When the voltage at the output terminal OUT becomes equal to the input voltage (+ NV2) or (+ NV4), the N-type transistor 606 is turned off, and the input voltage (+ PV2) or (+ PV4) is turned on by the operation of the P-type transistor 507. Converges to a voltage approximately equal to).
- the voltage at the output terminal OUT may fall below the voltage (+ PV2) or (+ PV4) due to the fluctuations in the potential of the electrodes on the LCD panel to be driven (reference numeral 1202 in FIG. 12). And reference numeral 1202 in FIGS. 13 and 14).
- the voltage at the negative input terminal of the second impedance conversion circuit 104 since the voltage at the negative input terminal of the second impedance conversion circuit 104 also decreases, the output voltage of the P-type differential amplifier circuit 602 decreases, and the P-type transistor 605 turns on. As a result, the voltage at the output terminal OUT is increased to (+ PV2) or (+ PV4) or more (state 1202 in FIG. 12).
- the P-type transistor 605 When the voltage at the output terminal OUT becomes equal to the input voltage (+ PV2) or (+ PV4) to the + P terminal, the P-type transistor 605 is turned off. The voltage further rises, and the voltage at the output terminal OUT is maintained at the voltage (+ NV2) or (+ NV4) by the operation of the P-type transistor 607 during the stable period.
- the impedance conversion circuit is moved to the electrode to be driven.
- the first and second impedance conversion circuits 103 and 104 are selectively used depending on the polarity of the required charge amount.
- the first impedance conversion circuit 103 in FIG. 1 that outputs the voltages VI and V 3 is the amount of charge that needs to be moved from the electrode to be driven to the first impedance conversion circuit 103. From the comparison of the signs 1101 and 1102 of 14, the amount of charge of negative polarity is larger than the amount of charge of positive polarity. This is because the positive charge is equal to the potential difference of V0-VI or V2-V3 (one level difference) as shown by reference numeral 1101, whereas the maximum value of the negative charge is 1102 This is because it is equivalent to the potential difference between V5 and VI (4 levels difference) as shown in Fig. 7. Therefore, the voltage is set so as to satisfy the following equations (11) to (14).
- the second impedance conversion circuit 104 in FIG. 1 that outputs the voltages V2 and V4 moves from the electrode to be driven to the second impedance conversion circuit 104.
- the amount of charge that needs to be moved is larger for the positive charge than for the negative charge. This is because the maximum value of the negative charge is equivalent to the potential difference between V5 and V2 (three-level difference) as shown by reference numeral 1202, while the maximum value of the positive charge is shown by reference numeral 1201. This is because it is equivalent to the potential difference between V0 and V4 (4 level difference). Therefore, the voltage is set so as to satisfy the following equations (15) to (18).
- the voltage at the output terminal OUT of the second impedance conversion circuit 104 converges relatively quickly from the voltage higher than the voltage (+ NV1) or (+ NV3) to the voltage V2 or V4.
- the current consumed by the second impedance conversion circuit 104 until convergence can be reduced.
- the scanning electrode is called a common electrode and the signal electrode is called a segment electrode.
- the present invention can be applied to other driving methods such as an active matrix type liquid crystal device.
- the electronic device including the liquid crystal device include various electronic devices using the liquid crystal device as a module, a projector using the liquid crystal device as a light valve, and the like.
- the present invention can reduce power consumption, it is particularly useful for portable electronic devices such as a mobile phone, a mobile computer, an electronic organizer, a game device, a video camera with a liquid crystal viewfinder, and a digital camera.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000592691A JP3614104B2 (ja) | 1999-01-08 | 2000-01-07 | 液晶駆動用電源装置並びにそれを用いた液晶装置及び電子機器 |
EP00900140A EP1070980B1 (en) | 1999-01-08 | 2000-01-07 | Lcd device, electronic device, and power supply for driving lcd |
US09/623,197 US6342782B1 (en) | 1999-01-08 | 2000-01-07 | Power supply device for driving liquid crystal, liquid crystal device and electronic equipment using the same |
DE60036516T DE60036516T2 (de) | 1999-01-08 | 2000-01-07 | Lcd-vorrichtung, elektronisches gerät und stromversorgung zur ansteuerung der lcd |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11/2912 | 1999-01-08 | ||
JP291299 | 1999-01-08 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/623,197 A-371-Of-International US6342782B1 (en) | 1999-01-08 | 2000-01-07 | Power supply device for driving liquid crystal, liquid crystal device and electronic equipment using the same |
US09/977,941 Continuation US6476591B2 (en) | 1999-01-08 | 2001-10-17 | Power supply device for driving liquid crystal, liquid crystal device and electronic equipment using the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000041028A1 true WO2000041028A1 (fr) | 2000-07-13 |
Family
ID=11542575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/000038 WO2000041028A1 (fr) | 1999-01-08 | 2000-01-07 | Dispositif d'affichage a cristaux liquides, dispositif electronique et alimentation servant a faire fonctionner ledit dispositif d'affichage a cristaux liquides |
Country Status (8)
Country | Link |
---|---|
US (2) | US6342782B1 (ja) |
EP (1) | EP1070980B1 (ja) |
JP (1) | JP3614104B2 (ja) |
KR (1) | KR100385028B1 (ja) |
CN (1) | CN1106584C (ja) |
AT (1) | ATE374384T1 (ja) |
DE (1) | DE60036516T2 (ja) |
WO (1) | WO2000041028A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004034369A1 (ja) * | 2002-10-09 | 2004-04-22 | Mitsubishi Denki Kabushiki Kaisha | 定電流回路、駆動回路および画像表示装置 |
US7486288B2 (en) | 2003-12-08 | 2009-02-03 | Rohm Co., Ltd. | Display device driving apparatus and display device using the same |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW519610B (en) * | 2001-07-24 | 2003-02-01 | Winbond Electronics Corp | Fast liquid crystal display power-off residual image suppression circuitry and a method thereto |
DE10162766A1 (de) * | 2001-12-20 | 2003-07-03 | Koninkl Philips Electronics Nv | Schaltungsanordnung zur Spannungsversorgung einer Flüssigkristallanzeigevorrichtung |
DE10162765A1 (de) * | 2001-12-20 | 2003-07-03 | Koninkl Philips Electronics Nv | Anordnung zur Ansteuerung einer Anzeigevorrichtung mit Spannungsvervielfacher |
KR100438786B1 (ko) * | 2002-04-23 | 2004-07-05 | 삼성전자주식회사 | 저전력 고효율의 액정표시장치 구동 전압 발생 회로 및 그방법 |
JP3983124B2 (ja) * | 2002-07-12 | 2007-09-26 | Necエレクトロニクス株式会社 | 電源回路 |
CN100385491C (zh) * | 2002-11-20 | 2008-04-30 | 三菱电机株式会社 | 图像显示装置 |
US7446747B2 (en) * | 2003-09-12 | 2008-11-04 | Intersil Americas Inc. | Multiple channel programmable gamma correction voltage generator |
JP4651926B2 (ja) * | 2003-10-03 | 2011-03-16 | 株式会社 日立ディスプレイズ | 画像表示装置 |
CN1294450C (zh) * | 2003-11-03 | 2007-01-10 | 友达光电股份有限公司 | 串接式液晶显示器驱动电路 |
JP3846478B2 (ja) * | 2004-01-15 | 2006-11-15 | セイコーエプソン株式会社 | 昇圧回路、電源回路及び液晶駆動装置 |
JP3841083B2 (ja) * | 2004-01-20 | 2006-11-01 | セイコーエプソン株式会社 | 昇圧回路、電源回路及び液晶駆動装置 |
CN101191913B (zh) | 2006-11-17 | 2010-08-25 | 群康科技(深圳)有限公司 | 液晶显示面板 |
US20080246537A1 (en) * | 2007-04-03 | 2008-10-09 | Broadcom Corporation | Programmable discontinuity resistors for reference ladders |
KR101482768B1 (ko) * | 2008-07-28 | 2015-01-16 | 삼성디스플레이 주식회사 | 액정 표시 장치의 전원 회로 |
TWI423729B (zh) * | 2010-08-31 | 2014-01-11 | Au Optronics Corp | 整合放大器的源級驅動器 |
CN102522071B (zh) * | 2011-12-30 | 2013-11-27 | 北京大学 | Lcd像素选择信号产生电路、lcd控制器及其控制方法 |
CN109741491B (zh) * | 2018-12-18 | 2021-05-18 | 深圳市铁证科技有限公司 | 一种指静脉人脸锁主控模块 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5665190A (en) * | 1979-11-01 | 1981-06-02 | Nippon Electric Co | Voltage devider circuit |
JPS56115176A (en) * | 1980-02-15 | 1981-09-10 | Nec Corp | Voltage dividing circuit |
JPH06214527A (ja) * | 1993-01-18 | 1994-08-05 | Sharp Corp | 出力回路 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04113314A (ja) * | 1990-09-03 | 1992-04-14 | Sharp Corp | 液晶表示装置 |
JP3234043B2 (ja) | 1993-05-10 | 2001-12-04 | 株式会社東芝 | 液晶駆動用電源回路 |
JP3329077B2 (ja) | 1993-07-21 | 2002-09-30 | セイコーエプソン株式会社 | 電源供給装置、液晶表示装置及び電源供給方法 |
US5627547A (en) * | 1995-04-07 | 1997-05-06 | Delco Electronics Corporation | Mapless GPS navigation system in vehicle entertainment system |
JP3218168B2 (ja) | 1995-07-31 | 2001-10-15 | シャープ株式会社 | 液晶駆動用電源回路 |
US5675352A (en) * | 1995-09-07 | 1997-10-07 | Lucent Technologies Inc. | Liquid crystal display driver |
-
2000
- 2000-01-07 KR KR10-2000-7010017A patent/KR100385028B1/ko not_active IP Right Cessation
- 2000-01-07 DE DE60036516T patent/DE60036516T2/de not_active Expired - Fee Related
- 2000-01-07 US US09/623,197 patent/US6342782B1/en not_active Expired - Lifetime
- 2000-01-07 AT AT00900140T patent/ATE374384T1/de not_active IP Right Cessation
- 2000-01-07 JP JP2000592691A patent/JP3614104B2/ja not_active Expired - Lifetime
- 2000-01-07 WO PCT/JP2000/000038 patent/WO2000041028A1/ja active IP Right Grant
- 2000-01-07 EP EP00900140A patent/EP1070980B1/en not_active Expired - Lifetime
- 2000-01-07 CN CN00800019A patent/CN1106584C/zh not_active Expired - Lifetime
-
2001
- 2001-10-17 US US09/977,941 patent/US6476591B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5665190A (en) * | 1979-11-01 | 1981-06-02 | Nippon Electric Co | Voltage devider circuit |
JPS56115176A (en) * | 1980-02-15 | 1981-09-10 | Nec Corp | Voltage dividing circuit |
JPH06214527A (ja) * | 1993-01-18 | 1994-08-05 | Sharp Corp | 出力回路 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004034369A1 (ja) * | 2002-10-09 | 2004-04-22 | Mitsubishi Denki Kabushiki Kaisha | 定電流回路、駆動回路および画像表示装置 |
US7317441B2 (en) | 2002-10-09 | 2008-01-08 | Mitsubishi Denki Kabushiki Kaisha | Constant current circuit, drive circuit and image display device |
US7486288B2 (en) | 2003-12-08 | 2009-02-03 | Rohm Co., Ltd. | Display device driving apparatus and display device using the same |
Also Published As
Publication number | Publication date |
---|---|
CN1106584C (zh) | 2003-04-23 |
DE60036516T2 (de) | 2008-06-26 |
DE60036516D1 (de) | 2007-11-08 |
KR20010088284A (ko) | 2001-09-26 |
KR100385028B1 (ko) | 2003-05-23 |
US20020017932A1 (en) | 2002-02-14 |
ATE374384T1 (de) | 2007-10-15 |
EP1070980A4 (en) | 2002-03-27 |
JP3614104B2 (ja) | 2005-01-26 |
CN1293764A (zh) | 2001-05-02 |
EP1070980B1 (en) | 2007-09-26 |
US6476591B2 (en) | 2002-11-05 |
US6342782B1 (en) | 2002-01-29 |
EP1070980A1 (en) | 2001-01-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2000041028A1 (fr) | Dispositif d'affichage a cristaux liquides, dispositif electronique et alimentation servant a faire fonctionner ledit dispositif d'affichage a cristaux liquides | |
KR0140041B1 (ko) | 표시 장치용 전압 발생 회로, 공통 전극 구동 회로, 신호선 구동 회로 및 계조 전압 발생 회로 | |
CN101174397B (zh) | 数据驱动器及显示装置 | |
US8390609B2 (en) | Differential amplifier and drive circuit of display device using the same | |
US7420552B2 (en) | Driving voltage control device | |
US8368673B2 (en) | Output buffer and source driver using the same | |
US8482502B2 (en) | Common voltage generator, display device including the same, and method thereof | |
US20110316901A1 (en) | Data driver device and display device for reducing power consumption in a charge-share operation | |
JPH0798577A (ja) | 電源供給装置、液晶表示装置及び電源供給方法 | |
JP2002189454A (ja) | 電源回路、液晶装置及び電子機器 | |
CN101441845A (zh) | 伽马参考电压产生装置与伽马电压产生装置 | |
JP3600175B2 (ja) | 増幅装置及び液晶表示装置 | |
JP2012027127A (ja) | 液晶表示装置のソースドライバ及びそれを用いた液晶表示装置 | |
JP2001286126A (ja) | チャージポンプ型電源回路及びこれを用いた表示装置用駆動装置及び表示装置 | |
JP4462844B2 (ja) | 電源回路 | |
TW201933325A (zh) | 顯示裝置的參考電壓產生器 | |
KR101186005B1 (ko) | 액정표시장치 및 그의 구동 방법 | |
US8736594B2 (en) | Potential generation circuit and liquid crystal display device | |
US20080111589A1 (en) | System for adjusting driving capability of output stage | |
JP3642343B2 (ja) | 表示装置の駆動回路 | |
JP3431014B2 (ja) | 電源供給装置、液晶表示装置及び電源供給方法 | |
JP2909357B2 (ja) | 電源回路 | |
JP3059050B2 (ja) | 電源回路 | |
JP2004258274A (ja) | 液晶表示装置の共通電極駆動回路 | |
JP3121714B2 (ja) | 電圧出力回路並びに表示装置の共通電極駆動回路及び表示装置の階調電圧発生回路 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 00800019.0 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN JP KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1020007010017 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2000900140 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 09623197 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 2000900140 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1020007010017 Country of ref document: KR |
|
WWG | Wipo information: grant in national office |
Ref document number: 1020007010017 Country of ref document: KR |
|
WWG | Wipo information: grant in national office |
Ref document number: 2000900140 Country of ref document: EP |