CN103258499B - A kind of circuit of the ghost phenomena for eliminating in the display panel with optical transmitting set - Google Patents
A kind of circuit of the ghost phenomena for eliminating in the display panel with optical transmitting set Download PDFInfo
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- CN103258499B CN103258499B CN201210181927.0A CN201210181927A CN103258499B CN 103258499 B CN103258499 B CN 103258499B CN 201210181927 A CN201210181927 A CN 201210181927A CN 103258499 B CN103258499 B CN 103258499B
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Abstract
Present disclose provides a kind of for for having the circuit of parasitic capacitance discharge in the display panel with common-anode topology of multiple optical transmitting set, and be the circuit that charges of the parasitic capacitance in the display panel with common cathode topology.In common cathode topology, circuit includes the three terminal device with gate pole, source electrode and drain electrode, wherein source electrode and a common cathode being electrically coupled to this optical transmitting set in drain electrode；Also including the mechanism for controlling three terminal device, this mechanism is electrically coupled to gate pole.After the optical transmitting set the most selected is cancelled selection, this mechanism connects rapidly this three terminal device to be formed at the conductive path between source electrode and drain electrode.Voltage at common-anode drops to predetermined voltage level or after maximum time period terminates, and this mechanism disconnects this three terminal device.
Description
Related application
According to 35 U.S.C § 119, this application claims and enjoy what on February 16th, 2011 submitted to
The priority of the U.S. Provisional Application of No. 61/443703, and conduct is quoted in full at this
Reference.
Technical field
It relates to be used for driving optical transmitting set, the such as circuit of light emitting diode (LED).
More particularly, it relates to include the light-emitting diode display of light emitter arrays for driving
Circuit, to reduce, to offset or to eliminate the ghost effect in light-emitting diode display or ghost image.
Background technology
Display panel, such as light-emitting diode display can be driven with time-multiplexed topology.But
The shortcoming of time-multiplexed driving is occur ghost effect or ghost image on the display panel.
Usually, ghost effect refers to the hangover of the mobile object occurred on the display panel.For
Light-emitting diode display, ghost phenomena is probably and is caused by spuious capacity plate antenna (or parasitic capacitance),
It produces ghost image current spike and forces time-multiplexed LED should be switched off at LED
Time launch of short duration flash of light.The definite amplitude of the ghost image current spike in LED, the persistent period and
Sequential depends on the quantity of the stray capacitance in circuit, the forward voltage characteristic of LED, switch
Temporal characteristics etc..Of short duration flash of light can occur luminescence in inappropriate time, thus causes quality
Relatively difference image.
Along with size and the raising of resolution of digital LED display panel, in display design also
Have increasing need for the LED driver of high lever (highly leveraged).This typically results in greatly
The scan line of amount uses identical the switchable of current driver passage to join with for multiple LED
Put.Therefore, in such devices, need substantial amounts of power switch component and substantial amounts of connect
Head electric capacity.In overall light-emitting diode display system design, stray capacitance becomes more to bother,
Because they maintain the weak charging causing ghost phenomena.
For at least more than one reason, need to be designed to that repid discharge is spuious or parasitic electricity
The LED drive circuit held, to be reduced or eliminated in LED display board the ghost phenomena occurred.
Summary of the invention
In one embodiment, it is provided that a kind of for the display panel for having multiple optical transmitting set
In the circuit of parasitic capacitance discharge.This circuit includes three ends with gate pole, source electrode and drain electrode
Equipment, wherein source electrode and a common-anode being electrically coupled to optical transmitting set in drain electrode；And use
In the mechanism of this three terminal device of control, this mechanism is electrically coupled to the gate pole of this three terminal device.Formerly
Before after the optical transmitting set that selected is cancelled selection, described mechanism connect rapidly three terminal device with
It is formed at the conductive path between the source electrode of described three terminal device and drain electrode, thus by this conduction
Path is described parasitic capacitance discharge.Voltage at common-anode drop to predetermined voltage level or
After maximum time period terminates, described mechanism disconnects three terminal device.
In another embodiment, it is provided that a kind of have multiple optical transmitting set for elimination
The circuit of the ghost image in display panel.This circuit includes that the first circuit branch, second circuit divide
Prop up and tertiary circuit branch.First circuit branch, second circuit branch and described 3rd electricity
Road branch electric coupling in parallel is between the common cathode and reference voltage of optical transmitting set.First circuit
Branch forms the first conductive path, is cancelled selection with the optical transmitting set the most selected
After, the parasitic capacitance in described display panel of charging rapidly.Second branch forms the second conductive path,
With described parasitic capacitance of charging immediately after selecting next optical transmitting set.3rd branch is formed
3rd conductive path, charges in the case of being cancelled selection with previously selected optical transmitting set
Described parasitic capacitance.
In another embodiment, it is provided that a kind of display panel.This display panel includes having common cathode
The array of the optical transmitting set of pole, it is electrically coupled to the power supply of the anode of described optical transmitting set, selects electricity
Road and for eliminating the circuit of ghost phenomena.Selection circuit includes for selecting one continuously
Or multiple switches of multiple optical transmitting set.Charged electrical is included for eliminating the circuit of ghost phenomena
Road, is used for eliminating ghost image, also includes discharge circuit, for eliminating the ghost image on display panel
Effect, described discharge circuit includes ghost effect removing module, and it is electrically coupled to described light emission
The anode of device, and described charging circuit includes ghost image cancellation module, and it is electrically coupled to institute
State the common cathode of optical transmitting set.
Accompanying drawing explanation
Understand that following detailed description can easily understand that the present invention by combining appended accompanying drawing
Teaching.
Fig. 1 shows the display panel including LED array of an embodiment according to the disclosure；
Fig. 2 shows the link topology of the display panel of an embodiment according to the disclosure；
Fig. 3 show according to the disclosure an embodiment for the ghost image eliminating in display panel
The image calibrating circuit of effect；
Fig. 4 shows how timer protection operates in the image calibrating circuit shown in Fig. 3；
Fig. 5 shows the circuit for driving display panel according to another embodiment of the disclosure
Schematic diagram；
Fig. 6 shows the sequential chart of drive circuit in Fig. 5；
Fig. 7 shows the embodiment of the ghost effect removing module of drive circuit in Fig. 5；
Fig. 8 shows the embodiment of the ghost image cancellation module of drive circuit in Fig. 5, weight
Shadow image-erasing module includes the first circuit branch, second circuit branch and tertiary circuit branch；
Fig. 9 shows the schematic diagram of the first circuit branch of ghost image cancellation module in Fig. 8；
Figure 10 shows the schematic diagram of the time delay module of the first circuit branch in Fig. 9；
Figure 11 shows the schematic diagram of the protection module of the first circuit branch in Fig. 9；
Figure 12 shows the schematic diagram of the second circuit branch of ghost image cancellation module in Fig. 8；
Figure 13 shows the schematic diagram of the tertiary circuit branch of ghost image cancellation module in Fig. 8.
Detailed description of the invention
The multiple embodiments of the disclosure are described in detail below, appended shown in the drawings of these public affairs
The example opened.Should be appreciated that Anywhere can be by the similar or phase being suitable in those accompanying drawings
As reference, and similar or like reference can represent similar or like unit
Part.
Accompanying drawing shows the most for illustrative purposes and embodiment of the disclosure.Those skilled in the art
Member will easily recognize according to described below, in the situation of the basic principle without departing substantially from the disclosure
Under there is alternative embodiment.
Fig. 1 shows the LED display board 100 of an embodiment according to the disclosure.Real at this
Executing in example, LED display board 100 uses common-anode to configure.Usually, LED display board 100
Including LED current driver 120, the array of LED 110 and on-off circuit 130 with logical
Power supply is provided to LED 110 by overvoltage source 140.In this embodiment, current driver
120 negative electrodes 110 being coupled to LED, and on-off circuit 130 is coupled to the anode of LED.
As it is shown in figure 1, each pixel of display panel 100 is corresponding to LED (or LED
Unit).It is understood that each pixel can include two or more can launch identical or not
The LED of same color.Such as, a colored pixels can include three LED, in three
Each can launch red, green and blue light respectively.
In the embodiment in figure 1, display panel 100 includes 16 scan lines.Every scan line
Corresponding to 16 LED 110 of a line, and it is connected to switch.Therefore, in this embodiment
In, on-off circuit 130 includes 16 switches.Additionally, in this embodiment, display panel 100
Including 16 row LED.As it is shown in figure 1, each column include 16 LED and its be connected to
LED current driver.
By the row and column of the LED unit that interpolation adds, add what additional switch extremely added
OK, additional LED current driver is added for additional row, it is possible to easily expander graphs 1
Shown configuration.In alternate embodiments, display matrix be sized to be scaled up to such as
About 256 take advantage of 256.
Fig. 2 shows the connection topology of the display panel 200 of an embodiment according to the disclosure
Figure.Display panel 200 includes the array of LED 210, is coupled to the LED of the negative electrode of LED 210
Driver 220, including the on-off circuit of the switch 230 of multiple anodes being coupled to LED 210
240 image calibrating circuits 260 and 270 coupled with LED 210 and on-off circuit 230,
And the system controller 250 coupled with image calibrating circuit 260,270.On-off circuit 230
Optionally through voltage source 240, power supply is provided to LED 210.System controller 250 is controlled
Imaged correcting circuit 260 and 270 is not intended to display at display panel to control sequential elimination
The artifact (artifact) of such as ghost image or ghost effect on 200.
In certain embodiments, it is shown that and describe two image calibrating circuits 260 and 270.
Image calibrating circuit 260 and 270 is coupled to every a line of LED array.Image calibrating circuit
260 and 270 are connected to system controller, system controller coordinates the two circuit 260
With 270 function, with realize sequencing contro and eliminate artifact.
Fig. 3 shows the embodiment of the circuit 260 and 270 for eliminating ghost effect.Figure
The basic operation of the circuit 260/270 shown in 3 is as follows: when E1/ or E2 or E3 internally
When " low " state switches to " high " state, after the time delay of 5 nanoseconds, decoder exports
Become there is (i.e. " activation low ").When internal signal OE/ switches to from " low " state
During " high " state (i.e. "off"), corresponding power switch component PMOS disconnects.?
After the time delay of 10 nanoseconds, if CXB voltage is higher than 1.6V, then electric discharge NMOS will be connect
Lead to and keep " on " until CX is discharged to the voltage levvl less than 1.6V.Put subsequently
Electricity NMOS will be released by the comparator output.Select 1.6V reference voltage to be because it to be less than
Little LED connects voltage, and in order to avoid the strong reverse bias voltage on LED simultaneously.
But, reference voltage can be in the range of the 95% to 105% of its normal value.
Fig. 4 shows how timer protection operates in the image calibrating circuit shown in Fig. 3.
Such as, if CX voltage levvl is always above the reference voltage of 1.6V, then discharge NMOS
To be switched on and keep " on ".If CX voltage levvl is maintained at ripple near reference voltage
Dynamic, then electric discharge NMOS will be the most changeable (chopping).Accordingly, it would be desirable to timer is prevented
Only such high electric current risk.When YX internally switches to " high " state from " low " state
Time, timer counting starts.At the end of the time period of 500 nanoseconds, discharge NMOS by disabling,
And do not consider CX voltage levvl, until the internal switching of YX next time.
Upper electric protection work is as follows: for preventing any other high electric current risk at power up phase,
Por signal is introduced circuit 260/270.Release timer and electric discharge NMOS are until power supply
Reach normal voltage.
Referring now to Fig. 5, it is shown that according to another embodiment of the disclosure be used for drive display
The circuit of plate.In this embodiment, display panel uses common cathode configuration.Circuit can include using
In the ghost effect eliminated in the display panel of common cathode configuration and/or the image calibration of ghost image
Positive module.For exemplary purposes, illustrate only in Figure 52 optical transmitting set 510A and
510B.It is understood that display panel can include any suitable number can array in columns and rows
Or the optical transmitting set arranged.
In this embodiment, optical transmitting set 510A and 510B is placed on adjacent but separate sweeps
Retouch on line.It addition, the common cathode 514 of optical transmitting set 510A and 510B be connected to
Switch 530A and 530B.Additionally, the anode 512 of optical transmitting set 510A and 510B is connected
It is connected to power supply 520.Can switch on and off out by sending signal through port YXA and YXB
Close 530A and 530B, in order to properly select the scanning of light emitting diode 510A and 510B
Line.
Fig. 6 shows the exemplary timing chart for driving display panel shown in Fig. 5.At figure
In 6, the higher value of switch 530A or 530B (SWA or SWB) represents logical one,
And relatively low value represents logical zero.The higher value deenergization 520 of " GATEi ", and
Relatively low value switches on power 520.Sequential chart 610 represents the logic shape of switch 530A or SWA
State.Sequential chart 620 represents the logic state of switch 530B or SWB.Sequential chart 630 table
Show the input signal (such as pulse width modulation (PWM) signal) for controlling power supply 520.
Sequential chart 640 represents the electric current I flowing through optical transmitting set 510AA。
Referring again to Fig. 5, display panel there may be stray capacitance 505A and 505B, work as switch
When 530A with 530B connects and/or disconnects, stray capacitance can cause optical transmitting set 510A and
The nonideal luminescence of 510B.Such as, as it can be seen in figures 5 and 6, disconnect when switching 530 and work as
When switch 530B connects, optical transmitting set 510A should be disconnected and no longer luminous.
But, due to the electric charge being stored in stray capacitance 505A, in optical transmitting set 510A still
It is likely to be formed current spike 642, thus causes optical transmitting set 510 to send of short duration flash of light.This
Of short duration flash of light produces the virtual images being known as ghost image on the display panel.
Similarly, when switching 530A and connecting and switch 530B disconnection, even if power supply 520
It is turned off, owing to remaining in the residual charge in stray capacitance 505A, at optical transmitting set 510
In be still likely to be formed current spike 644.Therefore, optical transmitting set 510 is when it should turn off
Wait and still send of short duration flash of light.This is commonly called ghost effect.
In order to eliminate the ghost image in display panel and ghost effect, the circuit in Fig. 5 is further
Including ghost effect removing module 560 and ghost image cancellation module 570.In this embodiment,
Module 560 is electrically coupled to the anode 512 of optical transmitting set 510A and 510B.Should be appreciated that
In alternate embodiment, module 560 can integrate with power supply 520.Additionally, it is real at this
Executing in example, module 570 can include submodule 570A and 570B, and it can distinguish electric coupling
(being total to) negative electrode 514 to optical transmitting set 510A and 510B.
Fig. 7 shows the embodiment of the ghost effect removing module of circuit in Fig. 5.Such as Fig. 7
Shown in, module 560 includes PMOS transistor 710 and nmos pass transistor 720.At this
In embodiment, the source class of transistor 710 is coupled to the anode of optical transmitting set 510A and 510B
512；The drain electrode of transistor 710 is coupled to the drain electrode of transistor 720；And transistor 720
Source class ground connection.Additionally, the gate pole of transistor 710 is coupled to reference voltage Vref-GE, and brilliant
The gate pole of body pipe 720 is coupled to generate the control circuit of pwm control signal GATEi.
When control signal GATEi is high (power supply 520 in Fig. 5 turns off), pass through transistor
710 and 720 anodes 512 that can drag down optical transmitting set 510A.Transistor 710 can be by joining
Examine voltage Vref-GEControlling, reference voltage is about 0.6-1.6V, depends on optical transmitting set 510A
It is red LED or green/blue LED with 510B.
Fig. 8 shows the embodiment of the ghost image cancellation module 570 of circuit in Fig. 5.As
Shown in figure, module 570 includes first (pull-up) circuit branch, 810, second (pull-up) electricity
Road branch 820 and the 3rd (pull-up) circuit branch 830.First circuit branch 810 can be with
Reference voltage source VREF1, terminal YXA, clock signal clk and the light of switch 530A
The common cathode CX of emitter 510A and 510B or 514 electric couplings.Second circuit branch 820
Can be with the first circuit branch 810, reference voltage source VREF1, common cathode CX electric coupling.
Tertiary circuit branch 830 can be with reference voltage source VREF1, terminal YXA and common cathode
CX electric coupling.
In one embodiment, first, second, and third circuit branch 810,820 and 830
Can include there is first resistance of the first impedance R1, have the of the second impedance R2 respectively
Two resistance and the 3rd resistance with the 3rd impedance R3.In one embodiment, the first impedance
R1 is substantially less than the second impedance R2, and the second impedance R2 is substantially less than the described 3rd
Impedance R3 (i.e. R1 ＜ ＜ R2 ＜ ＜ R3).Therefore, three branches 810,820 and 830 have
Different upper pulling forces, wherein the first pull-up branch 810 is the strongest.
Fig. 9 shows the signal of the first branch 810 according to another embodiment of the disclosure
Figure.In this embodiment, the first branch 810 includes PMOS transistor 910, has first
The resistance 920 of impedance R1, for comparison reference voltage VRef-GIWith the letter from common cathode CX
Number comparator 930, inverter the 940, first AND gate the 950, second AND gate
960, time delay module 970 and protection module 980.
In this embodiment, the first branch 810 is the strongest path, and it can be at switch 530A
Disconnect (that is, terminal YXA step-down) afterwards after of short duration time delay (such as 10 nanosecond)
Pull-up common cathode CX.In this embodiment it is possible to by using time delay module 970 to realize
Of short duration delay.Figure 10 shows the example of time delay module 970.
From common cathode CX through resistance 920 and transistor 910 to reference voltage VREF's 1
Current path can remain up until the electromotive force at common cathode CX rises to Vref-GI.In order to protect
Protection circuit, can use protection module 980 to terminate at maximum time period (such as, 300 nanosecond)
Turn-off current path later.Figure 11 shows the example of protection module 980.
Comparator 930 may be used for comparing the electromotive force of common cathode CX and reference voltage Vref-GI。
Once the electromotive force of common cathode CX reaches reference voltage Vref-GI, the output of comparator 930 is permissible
Disconnect transistor 910.As shown in figure 11, protection module 980 can include digit counter
985, it can be used for counting the maximum pull-up time.Once reach maximum time restriction, then turn off
Transistor 910.In one embodiment, maximum time was limited to for 300 nanoseconds.
Figure 12 shows the second circuit branch 820 of ghost image cancellation module 570 in Fig. 8
Schematic diagram.Second electric current branch includes PMOS transistor 1210, has the electricity of impedance R2
Resistance 1220, rising edge pulse generator 1230.When switching 530B and being connected by rising signals,
Rising edge pulse generator 1230 receives rising signals this rising signals being converted into and has pre-
The pulse signal of fixed width degree.In this embodiment, the width of pulse signal was about 30 nanoseconds.
Pulse signal is then passed on to the gate pole of transistor 1210, to be formed from common cathode CX warp
Cross resistance 1220 and second path of transistor 1210 to reference voltage VREF 1.Work as switch
530B connects (that is, terminal YXB uprises) and continues 30 nanoseconds (width of pulse signal)
Time, this is effective.Second path can compensate to be connected and common cathode CX at switch 530B
Decline owing to electric capacity couples the electromotive force at common cathode CX caused when declining suddenly.Real at this
Executing in example, the impedance R2 of the resistance 1220 in the second branch 820 is substantially greater than the first branch
The impedance R1 of the resistance 920 in 810.
Figure 13 shows the tertiary circuit branch 830 of ghost image cancellation module 570 in Fig. 8
Schematic diagram.3rd branch 830 includes PMOS transistor 1310 and has impedance R3
Resistance 1320.When switching 530A and disconnecting (i.e. terminal YXA step-down), formed from altogether
3rd path of negative electrode CX to reference voltage VREF 1.3rd path can carry little (example
As, milliampere magnitude) by the electric current of resistance 1320.As long as switch 530A disconnects (i.e.,
Terminal YXA is for disconnecting), the 3rd path is switched on.3rd path can compensate from terminal YXA
Leakage current to ground.In this embodiment, the resistance of the resistance 1320 in the 3rd branch 830
Anti-R3 is substantially greater than the impedance R2 of the resistance 1220 in the second branch 820.
Describe in detail and embodiment of the disclosure.For a person skilled in the art, warp
Crossing and consider and put into practice the disclosure, other embodiments will be apparent from.Therefore specification and drawings should
It is exemplary and explanatory for being considered merely as, and the true scope of the disclosure is in claim
Book illustrates.
Claims (24)
1. one kind is used for being to have the parasitic capacitance discharge in the display panel of multiple optical transmitting set
Circuit, including:
Three terminal device, it has gate pole, source electrode and a drain electrode, wherein said source electrode and described
A common-anode being electrically coupled to described optical transmitting set in drain electrode；And
For controlling the mechanism of described three terminal device, described mechanism is electrically coupled to described three ends
The described gate pole of equipment, wherein, described mechanism includes comparator, time delay module and protection
Module；
Wherein, after the optical transmitting set the most selected is cancelled selection, described mechanism
Connect rapidly described three terminal device to be formed at described source electrode and the institute of described three terminal device
State the conductive path between drain electrode, thus be described parasitic capacitance by described conductive path
Electric discharge；And
Wherein, the voltage at described common-anode drop to preset reference voltage level it
After, described mechanism disconnects described three terminal device.
Circuit the most according to claim 1, also includes that electric coupling is in described source electrode and institute
State the resistance between one in drain electrode and described common-anode.
Circuit the most according to claim 1, wherein said preset reference voltage scope exists
Between 1.6V to 2.0V.
Circuit the most according to claim 1, wherein, described time delay module is a bit of
Described three terminal device is connected after time.
Circuit the most according to claim 4, wherein, the described a bit of time is 10 to receive
Second.
Circuit the most according to claim 1, wherein, once maximum time period terminates,
Described protection module disconnects described three terminal device.
Circuit the most according to claim 1, wherein, described comparator is by described common anode
Described voltage at pole is compared with described preset reference voltage, and at the most described common-anode
Described voltage less than or equal to described preset reference voltage, described comparator disconnects described three ends
Equipment.
8. one kind is used for elimination ghost image in the display panel with multiple optical transmitting set
Circuit, described circuit includes:
First circuit branch；
Second circuit branch；And
Tertiary circuit branch；
Wherein, described first circuit branch, described second circuit branch and described tertiary circuit
Branch's electric coupling in parallel is between the common cathode and reference voltage of described optical transmitting set；
Wherein, described first circuit branch forms the first conductive path, with the most selected
After optical transmitting set is cancelled selection, the parasitic capacitance in described display panel of charging rapidly；
Wherein, described second circuit branch forms the second conductive path, to select next light
Charge immediately after emitter described parasitic capacitance；And
Wherein, described tertiary circuit branch forms the 3rd conductive path, with the most selected
Optical transmitting set charges in the case of being cancelled selection described parasitic capacitance.
Circuit the most according to claim 8, wherein, described first circuit branch includes
Having the first resistance of the first impedance, described second circuit branch includes with the second impedance
Two resistance, and described tertiary circuit branch includes the 3rd resistance with the 3rd impedance.
Circuit the most according to claim 9, wherein, described first impedance is the least
In described second impedance, and described second impedance is substantially less than described 3rd impedance.
11. circuit according to claim 8, wherein, described first circuit branch includes:
First three terminal device, it has gate pole, source electrode and a drain electrode, wherein said source electrode and
One in described drain electrode is electrically coupled to described common cathode；And
For controlling the mechanism of described first three terminal device, described mechanism is electrically coupled to described
The described gate pole of the first three terminal device；
Wherein, after the optical transmitting set the most selected is cancelled selection, described mechanism
Described first three terminal device of connection is to form described first conductive path rapidly, thus passes through
Described first conductive path is the charging of described parasitic capacitance；And
Wherein, the voltage at described common cathode rises to predetermined voltage level or in maximum
After time period terminates, described mechanism disconnects described first three terminal device.
12. circuit according to claim 8, wherein, described second circuit branch includes
Second three terminal device and rising edge pulse generator.
13. circuit according to claim 12, wherein, have selected next light emission
After device, described rising edge pulse generator produces pulse signal, to connect described two or three end
Equipment, forms described second conductive path with this.
14. circuit according to claim 13, wherein, the pulse width of described pulse signal
Degree was 30 nanoseconds.
15. 1 kinds of display panels, including:
The array of optical transmitting set, it has common cathode；
Power supply, it is electrically coupled to the anode of described optical transmitting set；
Selection circuit, it includes multiple switch, for selecting one or more light emission continuously
Device；
For eliminating the circuit of ghost phenomena, including charging circuit, be used for eliminating ghost image with
And discharge circuit, for eliminating the ghost effect on described display panel, described discharge circuit includes
Ghost effect removing module, it is electrically coupled to the described anode of described optical transmitting set, and described
Charging circuit includes ghost image cancellation module, and it is electrically coupled to the described common of described optical transmitting set
Negative electrode；
Described ghost effect removing module includes the three terminal device with gate pole, source electrode and drain electrode,
In described source electrode and described drain electrode one is electrically coupled to the described anode of described optical transmitting set；
Described ghost image cancellation module includes the first circuit branch；Second circuit branch；And
Tertiary circuit branch；Wherein, described first circuit branch, described second circuit branch and institute
State tertiary circuit branch electric coupling in parallel in the described common cathode of described optical transmitting set and reference
Between voltage.
16. display panels according to claim 15, wherein, described first circuit branch
Form the first conductive path, after being cancelled selection with the optical transmitting set the most selected, fast
Parasitic capacitance in the speed described display panel of charging.
17. display panels according to claim 16, wherein, described second circuit branch shape
Become the second conductive path, with the described parasitic electricity that charges immediately after selecting next optical transmitting set
Hold.
18. display panel according to claim 17, wherein, described tertiary circuit branch shape
Become the 3rd conductive path, fill in the case of being cancelled selection with the optical transmitting set the most selected
The described parasitic capacitance of electricity.
19. 1 kinds for for having the parasitic capacitance discharge in the display panel of multiple optical transmitting set
Circuit, including:
Three terminal device, it has gate pole, source electrode and a drain electrode, wherein said source electrode and described
A common-anode being electrically coupled to described optical transmitting set in drain electrode；And
For controlling the mechanism of described three terminal device, described mechanism is electrically coupled to described three ends
The described gate pole of equipment, wherein, described mechanism includes comparator, time delay module and protection
Module；
Wherein, after the optical transmitting set the most selected is cancelled selection, described mechanism
Connect rapidly described three terminal device to be formed at described source electrode and the institute of described three terminal device
State the conductive path between drain electrode, thus be described parasitic capacitance by described conductive path
Electric discharge；And
Wherein, after maximum time period terminates, described mechanism disconnects described three terminal device.
20. circuit according to claim 19, also include electric coupling at described source electrode and
The resistance between one and described common-anode in described drain electrode.
21. circuit according to claim 19, wherein, described time delay module is little one
Described three terminal device is connected after the section time.
22. circuit according to claim 21, wherein, the described a bit of time is 10
Nanosecond.
23. circuit according to claim 19, wherein, the most described maximum time period
Terminating, described protection module disconnects described three terminal device.
24. circuit according to claim 19, wherein, described comparator is by described common
Voltage at anode is compared with preset reference voltage, and described at the most described common-anode
Voltage is less than or equal to described preset reference voltage, and described comparator disconnects described three terminal device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/397,669 | 2012-02-15 | ||
| US13/397,669 US9047810B2 (en) | 2011-02-16 | 2012-02-15 | Circuits for eliminating ghosting phenomena in display panel having light emitters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103258499A CN103258499A (en) | 2013-08-21 |
| CN103258499B true CN103258499B (en) | 2016-08-17 |
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| CN201210181927.0A Active CN103258499B (en) | 2012-02-15 | 2012-05-28 | A kind of circuit of the ghost phenomena for eliminating in the display panel with optical transmitting set |
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| CN103929864B (en) * | 2014-05-06 | 2015-11-25 | 深圳市绿源半导体技术有限公司 | For Charge controlled method and device, the LED drive circuit of LED drive circuit |
| WO2022000315A1 (en) * | 2020-06-30 | 2022-01-06 | 华为技术有限公司 | Pixel driver circuit |
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| KR100913523B1 (en) * | 2007-12-13 | 2009-08-21 | 주식회사엘디티 | LED driving device for removing afterimage phenomenon of LED panel and method driving thereof |
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| CN101004894A (en) * | 2006-10-20 | 2007-07-25 | 北京巨数数字技术开发有限公司 | Scan type LED display unit, and method for eliminating latent brightness of previous line |
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