CN103886822A - Source electrode driver - Google Patents

Source electrode driver Download PDF

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Publication number
CN103886822A
CN103886822A CN201210557281.1A CN201210557281A CN103886822A CN 103886822 A CN103886822 A CN 103886822A CN 201210557281 A CN201210557281 A CN 201210557281A CN 103886822 A CN103886822 A CN 103886822A
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CN
China
Prior art keywords
switch
during
source electrode
electrically connected
recycling
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Pending
Application number
CN201210557281.1A
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Chinese (zh)
Inventor
黄立群
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Novatek Microelectronics Corp
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Novatek Microelectronics Corp
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Publication date
Application filed by Novatek Microelectronics Corp filed Critical Novatek Microelectronics Corp
Priority to CN201210557281.1A priority Critical patent/CN103886822A/en
Publication of CN103886822A publication Critical patent/CN103886822A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a source electrode driver used for driving a data line. The source electrode driver comprises an output pin, a buffer amplifier, a first switch, a recovery capacitor, a second switch, a power source supply circuit and a third switch, wherein the output pin is coupled with the data line, the first switch is for electrically connecting the buffer amplifier with the output pin during a charging period, the second switch is coupled with the recovery capacitor and is for electrically connecting the recovery capacitor with the output pin during a recovery period, the recovery period is after the charging period, the third switch is for electrically connecting the recovery capacitor with the power source supply circuit during a reutilization period, and the reutilization period is after the recovery period.

Description

Source electrode driver
Technical field
The invention relates to a kind of source electrode driver.
Background technology
Liquid crystal display (Liquid Crystal Display, LCD) have that external form is frivolous, power consumption is few and a characteristic such as radiationless pollution, be widely used on the information products such as various computer system, mobile phone, personal digital assistant (PDA).The principle of work of liquid crystal display is to utilize liquid crystal molecule under different ordered states, light is had to different polarizations or refraction effect, therefore can control via the liquid crystal molecule of different ordered states the amount of penetrating of light, further produce the output light of varying strength, and the red, green, blue of different GTG intensity.
Liquid crystal display be by source electrode driver and gate driver respectively driving data lines and sweep trace to show corresponding picture.In the process of display frame, source electrode driver need to constantly charge to data line and discharge, and causes a large amount of electric charges constantly in charging and discharge process, to run off.Particularly, when liquid crystal display applications is during in electronic apparatus, the consumption of power is often inversely proportional to service time.Therefore, how to improve the service efficiency of electric power, become a considerable problem.
Summary of the invention
The invention relates to a kind of source electrode driver.
According to the present invention, a kind of source electrode driver is proposed.Source electrode driver is in order to driving data lines.Source electrode driver comprises output connecting pin, buffer amplifier, the first switch, reclaims electric capacity, second switch, power supply circuit and the 3rd switch.Output connecting pin is coupled to data line.The first switch is electrically connected to output connecting pin by buffer amplifier between charge period.Second switch is coupled to recovery electric capacity, and between payback period, recovery electric capacity is electrically connected to output connecting pin.Between payback period, be between charge period after.The 3rd switch in recycling during recoverys electric capacity is electrically connected to power supply circuit, and recycle during be between payback period after.
For above-mentioned and other side of the present invention is had to better understanding, special embodiment below, and coordinate appended graphicly, be described in detail below.
Brief description of the drawings
Fig. 1 illustrates the schematic diagram into a kind of liquid crystal display.
Fig. 2 illustrates the schematic diagram into a kind of source electrode driver according to the first embodiment.
Fig. 3 illustrates as the horizontal scanning input signal according to the first embodiment and the sequential chart of switch controlling signal.
Fig. 4 illustrates the schematic diagram into a kind of source electrode driver according to the second embodiment.
Fig. 5 illustrates as the horizontal scanning input signal according to the second embodiment and the sequential chart of switch controlling signal.
Fig. 6 illustrates the schematic diagram into a kind of source electrode driver according to the 3rd embodiment.
[main element label declaration]
1: liquid crystal display 11,11a, 11b, 11c: source electrode driver
12: gate drivers 13: data line
14: sweep trace 15: pixel
111: output connecting pin 112: buffer amplifier
113a, 113b: power supply circuit 114: bias terminal
115: data statistics circuit 1131: power source supply end
1132: voltage output end 1134: pull-up circuit
1135: voltage input end CAVDD: output capacitance
Ceq: reclaim capacitor C l: load capacitance
C1: first end C2: the second end
H sYNC: horizontal-drive signal Vout: pixel voltage
Vc: bias level SW1: the first switch
SW2: second switch SW3: the 3rd switch
SW4: the 4th switch S C1～SC4: switch controlling signal
T1: T2 between charge period: between payback period
T3: T4 during boosting: during recycling
Embodiment
Please refer to Fig. 1, Fig. 1 illustrates the schematic diagram into a kind of liquid crystal display.Liquid crystal display 1 comprises source electrode driver 11, gate drivers 12, data line 13, sweep trace 14 and pixel 15.Data line 13 is electrically connected source electrode driver 11 and pixel 15, and sweep trace 14 is electrically connected gate drivers and pixel 15.
The first embodiment
Referring to Fig. 1, Fig. 2 and Fig. 3, Fig. 2 illustrates the schematic diagram into a kind of source electrode driver according to the first embodiment, and Fig. 3 illustrates as the horizontal scanning input signal according to the first embodiment and the sequential chart of switch controlling signal.The source electrode driver 11 that Fig. 1 illustrates is to represent with source electrode driver 11a in the first embodiment.Source electrode driver 11a driving data lines 13, and source electrode driver 11a comprises output connecting pin 111, buffer amplifier 112, the first switch SW 1, reclaims capacitor C eq, second switch SW2, power supply circuit 113a and the 3rd switch SW 3.Output connecting pin 111 is coupled to data line 13, and second switch SW2 is coupled to recovery capacitor C eq.The first switch SW 1, second switch SW2 and the 3rd switch SW 3 are controlled by respectively switch controlling signal SC1, switch controlling signal SC2 and switch controlling signal SC3, and switch controlling signal SC1 is in horizontal-drive signal H sYNCrear generation.
Buffer amplifier 112 is electrically connected to output connecting pin 111 by switch SW 1 T1 between charge period.Now, the pixel voltage Vout that buffer amplifier 112 is exported exports pixel 15 to through switch SW 1, output connecting pin 111 and data line 13.Afterwards, recovery capacitor C eq is electrically connected to output connecting pin 111 by second switch SW2 T2 between payback period.Between payback period, T2 is between charge period after T1.It should be noted that, output connecting pin 111 is coupled to pixel 15 through data line 13.The stray capacitance of source electrode driver 11 inside and the stray capacitance of pixel 15 are to form a load capacitance C l.Be electrically connected to load capacitance C when reclaiming capacitor C eq lafter, reclaiming capacitor C eq will be from load capacitance C lreclaim electric charge.Then, the 3rd switch SW 3 in recycling during T3 recovery capacitor C eq is electrically connected to power supply circuit 113a, during recycling T3 be between payback period after.
Furthermore, reclaim capacitor C eq and comprise first end C1 and the second end C2.First end C1 is coupled to second switch SW2, and the second end C2 receives a reference voltage.Reference voltage equals an earth level in the first embodiment.The first end C1 that reclaims capacitor C eq is electrically connected to output connecting pin 111 by second switch SW2 T2 between payback period, and the 3rd switch SW 3 T3 during recycling is electrically connected to the first end C1 that reclaims capacitor C eq the power source supply end 1131 of power supply circuit 113a.
Aforementioned power source supply circuit 113a is voltage adjuster, and voltage adjuster is for example low pressure difference linear voltage regulator (Low Dropout Regulator, LDO).The 3rd switch SW 3 T3 during recycling is electrically connected to recovery capacitor C eq the power source supply end 1131 of voltage adjuster 113a.Owing to reclaiming charge energy that capacitor C eq the reclaims working power as power supply circuit 113a, therefore can improve province's electrical efficiency.
The second embodiment
Referring to Fig. 4 and Fig. 5, Fig. 4 illustrates the schematic diagram into a kind of source electrode driver according to the second embodiment, and Fig. 5 illustrates as the horizontal scanning input signal according to the second embodiment and the sequential chart of switch controlling signal.The second embodiment and the first embodiment main difference part are that source electrode driver 11b also comprises bias terminal 114 and the 4th switch SW 4, and power supply circuit 113b is a charge pumping.Bias terminal 114 is to be maintained at a bias level that is greater than earth level.Power supply circuit 113b comprises pull-up circuit 1134, output capacitance CAVDD, voltage input end 1135 and voltage output end 1132, and pull-up circuit 1134 and output capacitance CAVDD are coupled to voltage output end 1132.Pull-up circuit 1134 boosts after voltage input end 1135 receiver voltages, then the voltage after boosting is exported by voltage output end 1132.
Buffer amplifier 112 is electrically connected to output connecting pin 111 by switch SW 1 T1 between charge period.Now, the pixel voltage Vout that buffer amplifier 112 is exported exports pixel 15 to through switch SW 1, output connecting pin 111 and data line 13.Afterwards, second switch SW2 T2 between payback period is electrically connected to output connecting pin 111 to reclaim load capacitance C by the first end that reclaims capacitor C eq lelectric charge.Then, the second end C2 that reclaims capacitor C eq is electrically connected to bias terminal 1132 by the 4th switch SW 4 T4 during boosting, to be increased to bias level Vc with reference to voltage by earth level.During boosting, T4 is during T2 between payback period and recycling between T3.Then, the 3rd switch SW 3 T3 during recycling is electrically connected to the first end C2 that reclaims capacitor C eq the voltage output end 1132 of power supply circuit 113b.Because level T4 during boosting of first end C1 is enhanced, subsequent recovery capacitor C eq is T3 during recycling, and the voltage after can providing one to boost is to voltage output end 1132 and output capacitance CAVDD.
The 3rd embodiment
Referring to Fig. 2 and Fig. 6, Fig. 6 illustrates the schematic diagram into a kind of source electrode driver according to the 3rd embodiment.The 3rd embodiment and the first embodiment main difference part are that source electrode driver 11c also comprises data statistics circuit 115, and aforementioned power source supply circuit 113a and power supply circuit 113b are respectively voltage adjuster and charge pump.The picture analysis that data statistics circuit 115 shows wish judges a recovery electric charge proportion, and according to reclaiming electric charge proportion output switch control signal SC3, the 3rd switch SW 3 is electrically connected to the power source supply end 1131 of voltage adjuster or the voltage input end 1135 of charge pumping according to switch controlling signal SC3 T3 during recycling by first end C1.
In the time that recovery electric charge proportion is low, the 3rd switch SW 3 is electrically connected to according to switch controlling signal SC3 T3 during recycling the first end C1 that reclaims capacitor C eq the power source supply end 1131 of voltage adjuster.On the contrary, in the time that recovery electric charge proportion is high, the 3rd switch SW 3 is electrically connected to according to switch controlling signal SC3 T3 during recycling the first end C1 that reclaims capacitor C eq the voltage input end 1135 of charge pumping.
In sum, although the present invention discloses as above with embodiment, so it is not in order to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on the appended claim scope person of defining.

Claims (12)

1. a source electrode driver, in order to drive a data line, this source electrode driver comprises:
One output connecting pin, is coupled to this data line;
One buffer amplifier;
One first switch is electrically connected to this output connecting pin by this buffer amplifier between a charge period;
One reclaims electric capacity;
One second switch, is coupled to this recovery electric capacity, and between a payback period, this recovery electric capacity is electrically connected to this output connecting pin, between this payback period, be between this charge period after;
One power supply circuit; And
One the 3rd switch, in this recovery electric capacity being electrically connected to this power supply circuit between period of use again and again, during this recycling, be between payback period after.
2. source electrode driver according to claim 1, wherein this power supply circuit is a voltage adjuster, the 3rd switch is electrically connected to this recovery electric capacity the power source supply end of this voltage adjuster during this recycling.
3. source electrode driver according to claim 1, also comprise a bias terminal and one the 4th switch, this power supply circuit is a charge pumping, and this charge pumping comprises a pull-up circuit, an output capacitance and a voltage output end, this pull-up circuit and this output capacitance are coupled to this voltage output end, the 4th switch is electrically connected to this bias terminal by this recovery electric capacity in one during boosting, so that this reference voltage is increased to a second electrical level by one first level, this boost during between this payback period and between during this recycling.
4. source electrode driver according to claim 3, wherein the 3rd switch is electrically connected to this output capacitance by this recovery electric capacity during this recycling, and this is between this payback period and between during this recycling during boosting.
5. source electrode driver according to claim 1, wherein this power supply circuit comprises:
One voltage adjuster; And
One charge pumping, the 3rd switch is electrically connected to this voltage adjuster or this charge pumping by this recovery electric capacity during this recycling.
6. source electrode driver according to claim 1, also comprises:
One data statistics circuit, the picture analysis that wish is shown judges a recovery electric charge proportion, and according to this recovery electric charge proportion output switch control signal, the 3rd switch is electrically connected to this voltage adjuster or this charge pumping by this recovery electric capacity according to this switch controlling signal during this recycling.
7. source electrode driver according to claim 1, wherein this recovery electric capacity comprises a first end and one second end, and this second termination is received a reference voltage, and the 3rd switch is electrically connected to this power supply circuit by this first end during this recycling.
8. source electrode driver according to claim 7, wherein this power supply circuit is a voltage adjuster, the 3rd switch is electrically connected to this first end the power source supply end of this voltage adjuster during this recycling.
9. source electrode driver according to claim 8, also comprise a bias terminal and one the 4th switch, this power supply circuit is a charge pumping, and this charge pumping comprises a pull-up circuit, an output capacitance and a voltage output end, this pull-up circuit and this output capacitance are coupled to this voltage output end, the 4th switch is electrically connected to this bias terminal by this second end in one during boosting, so that this reference voltage is increased to a second electrical level by one first level, this boost during between this payback period and between during this recycling.
10. source electrode driver according to claim 9, wherein the 3rd switch is electrically connected to this output connecting pin by this first end during this recycling, and this is between this payback period and between during this recycling during boosting.
11. source electrode drivers according to claim 7, wherein this power supply circuit comprises:
One voltage adjuster; And
One charge pumping, the 3rd switch is electrically connected to this first end the power source supply end of this voltage adjuster or the voltage input end of this charge pumping during this recycling.
12. source electrode drivers according to claim 7, also comprise:
One data statistics circuit, the picture analysis that wish is shown judges a recovery electric charge proportion, and according to this recovery electric charge proportion output switch control signal, the 3rd switch is electrically connected to this first end the power source supply end of this voltage adjuster or the voltage input end of this charge pumping during this recycling according to this switch controlling signal.
CN201210557281.1A 2012-12-19 2012-12-19 Source electrode driver Pending CN103886822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210557281.1A CN103886822A (en) 2012-12-19 2012-12-19 Source electrode driver

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Application Number Priority Date Filing Date Title
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CN103886822A true CN103886822A (en) 2014-06-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10755657B2 (en) 2015-03-03 2020-08-25 Innoaxis Co., Ltd Energy retrievable data driver, display, and method of driving display

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020070928A1 (en) * 1999-01-14 2002-06-13 Kenji Awamoto Method and device for driving a display panel
CN1434432A (en) * 2002-01-16 2003-08-06 株式会社日立制作所 LCD equipment having improved precharge circuit and method of driving same
CN101320549A (en) * 2007-06-05 2008-12-10 奇景光电股份有限公司 Power control method and system for polarity inversion in LCD panels
US20100220084A1 (en) * 2009-02-27 2010-09-02 Himax Technologies Limited Source driver with low power consumption and driving method thereof
TW201225036A (en) * 2010-12-02 2012-06-16 Sitronix Technology Corp Driving circuit of display panel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020070928A1 (en) * 1999-01-14 2002-06-13 Kenji Awamoto Method and device for driving a display panel
CN1434432A (en) * 2002-01-16 2003-08-06 株式会社日立制作所 LCD equipment having improved precharge circuit and method of driving same
CN101320549A (en) * 2007-06-05 2008-12-10 奇景光电股份有限公司 Power control method and system for polarity inversion in LCD panels
US20100220084A1 (en) * 2009-02-27 2010-09-02 Himax Technologies Limited Source driver with low power consumption and driving method thereof
TW201225036A (en) * 2010-12-02 2012-06-16 Sitronix Technology Corp Driving circuit of display panel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10755657B2 (en) 2015-03-03 2020-08-25 Innoaxis Co., Ltd Energy retrievable data driver, display, and method of driving display

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Application publication date: 20140625