CN105931592B - Detection and correction device - Google Patents
Detection and correction device Download PDFInfo
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- CN105931592B CN105931592B CN201610554421.8A CN201610554421A CN105931592B CN 105931592 B CN105931592 B CN 105931592B CN 201610554421 A CN201610554421 A CN 201610554421A CN 105931592 B CN105931592 B CN 105931592B
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- 238000001514 detection method Methods 0.000 title claims abstract description 66
- 230000005611 electricity Effects 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 15
- 230000002159 abnormal effect Effects 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000008447 perception Effects 0.000 description 3
- 101150096622 Smr2 gene Proteins 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- 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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a detection and correction device which is used for detecting a plurality of light emitting diode strings, wherein one end of each light emitting diode string is used for receiving input voltage. The detection and correction device comprises a pull-up unit, a detection unit and a correction unit. The pull-up unit is used for being switchably coupled with the light-emitting diode strings. The detection unit is used for detecting the feedback voltages of the light emitting diode strings and outputting a control signal according to the feedback voltages. The calibration unit is used for receiving a control signal to control the pull-up unit, so that the pull-up unit is switched to be coupled with the specific light-emitting diode string and pulls up the voltage at the other end of the specific light-emitting diode string.
Description
Technical field
The present invention is about a kind of basic electronic circuit, and in particular to a kind of detection and means for correcting.
Background technique
The LED drive of traditional display device can detect the state of light emitting diode string, if light emitting diode
String, which generates abnormal cases, the driver such as short circuit or open circuit, can correspondingly close abnormal luminous diode string, whole to avoid increasing
Power consumption and generate additional heat.However, display device will be made if closing the abnormal luminous diode string in display device
Picture brightness is uneven, influences the perception of user.
It can be seen that above-mentioned existing mode, it is clear that there are still inconvenient and defects, and have much room for improvement.It is above-mentioned in order to solve
Problem, related fields there's no one who doesn't or isn't painstakingly seeks solution, but does not develop solution appropriate yet for a long time.
Summary of the invention
Summary of the invention be intended to provide the content of present invention simplify abstract so that reader have to the content of present invention it is basic
Understand.The invention content is not the complete overview of the content of present invention, and its be not intended to point out the embodiment of the present invention it is important/
Key element defines the scope of the present invention.
To solve problem of the prior art, the technology aspect of the content of present invention about a kind of detection and means for correcting, this
Detection and means for correcting are to detect a plurality of light emitting diode string, and one end of those light emitting diode strings is to receive input electricity
Pressure.Above-mentioned detection and means for correcting include pull-up unit, detection unit and correction unit.Pull-up unit is switchably to couple
In those light emitting diode strings.Feedback voltage of the detection unit to detect those light emitting diode strings, according to those feedback electricity
Pressure is to export control signal.Correction unit is to receive control signal to control pull-up unit, so that pull-up unit switches over
To be coupled to particular led string, and pull up the voltage of the other end of particular led string.
Therefore, technology contents according to the present invention, the embodiment of the present invention are used by a kind of detection and means for correcting is provided
Improve after abnormal luminous diode string is closed, the picture brightness of display device is uneven and influences asking for the perception of user
Topic.
After refering to following description, those skilled in the art are of the invention when that can will readily appreciate that
Essence spirit and other goals of the invention and the technology used in the present invention means and state sample implementation.
Detailed description of the invention
For above and other purpose, feature, advantage and embodiment of the invention can be clearer and more comprehensible, Detailed description of the invention is such as
Under:
Fig. 1 is is painted a kind of detection and means for correcting and its light emitting diode string for being controlled according to one embodiment of the invention
Schematic diagram.
Fig. 2 is the partial circuit that a kind of detection and means for correcting as shown in Figure 1 are painted according to another embodiment of the present invention
Schematic diagram.
Fig. 3 is the partial circuit that a kind of detection and means for correcting as shown in Figure 1 are painted according to yet another embodiment of the invention
Schematic diagram.
Fig. 4 is the partial circuit that a kind of detection and means for correcting as shown in Figure 1 are painted according to further embodiment of this invention
Schematic diagram.
Fig. 5 is the partial circuit that a kind of detection and means for correcting as shown in Figure 1 are painted according to another embodiment of the present invention
Schematic diagram.
Fig. 6 is is painted a kind of detection and means for correcting and its light emitting diode string for being controlled according to one embodiment of the invention
Schematic diagram.
Fig. 7 is the partial circuit that one kind detection as shown in FIG. 6 and means for correcting are painted according to another embodiment of the present invention
Schematic diagram.
According to usual operation mode, various features are not drawn to scale with element in figure, drafting mode be in order to
Specific features and element related to the present invention are presented in optimal manner.In addition, between different attached drawings, with the same or similar
Component symbol censures similar elements/components.
Wherein, appended drawing reference:
100: detection and means for correcting
110: pull-up unit
120: detection unit
122: feedback voltage detector
124: open circuit detector
126: short circuit detector
128: determining device
130: correction unit
131: electric current guide
136: brightness adjustment device
138: exception control device
180: IC bus interface
112: guiding module
125: multiplexer
127A~127C: comparator
132: logic judging device
133: open-circuit current guide
134: de-multiplexer
Specific embodiment
In order to keep the narration of the content of present invention more detailed with it is complete, below for state sample implementation of the invention and specific
Embodiment proposes illustrative description；But this not implements or uses the unique forms of the specific embodiment of the invention.Embodiment party
The feature of multiple specific embodiments is covered in formula and to construction and the method and step for operating these specific embodiments and its
Sequentially.However, can also reach identical or impartial function and sequence of steps using other specific embodiments.
Unless this specification is defined otherwise, technology belonging to the meaning and the present invention of science and technology vocabulary used herein is led
Technical staff in domain understands identical as usual meaning.In addition, in the case of getting along well context conflict, this specification institute
Singular noun covers the complex number type of the noun；And also cover the singular type of the noun when used plural noun.
In addition, about " coupling " used herein, can refer to two or multiple element mutually directly make entity or be electrically connected with
Touching, or mutually put into effect indirectly body or in electrical contact is also referred to as two or multiple element mutual operation or movement.
Fig. 1 is is painted a kind of detection and means for correcting and its light emitting diode string for being controlled according to one embodiment of the invention
Schematic diagram.Referring to Fig. 1, detection and means for correcting 100 are to detect a plurality of light emitting diode string L1~Ln, light emitting diode
One end of string L1~Ln is to receive input voltage, if the upper end of light emitting diode string L1 is to receive input voltage.
Above-mentioned detection and means for correcting 100 include pull-up unit 110, detection unit 120 and correction unit 130.In connection
In relationship, detection unit 120 is coupled to correction unit 130, and correction unit 130 is coupled to pull-up unit 110, pull-up unit 110
To be switchably coupled to light emitting diode string L1~Ln.In in electrically operation, one end of light emitting diode string L1~Ln is used
To receive input voltage vin b through booster.Feedback electricity of the detection unit 120 to detect light emitting diode string L1~Ln
Vcs is pressed, and according to those feedback voltage Vs cs to export control signal Scon.Correction unit 130 is to receive control signal Scon
To control pull-up unit 110, so that pull-up unit 110 is switched over to be coupled to particular led string, and pull up specific
The voltage of the other end of light emitting diode string.
For the benefit of understand the detection of this case and the mode of operation of means for correcting 100, also referring to Fig. 1 and Fig. 2, Fig. 2 is
It is painted the partial circuit schematic diagram of a kind of detection and means for correcting as shown in Figure 1 according to another embodiment of the present invention, such as pulls up
The connection relationship diagram of unit 110 and light emitting diode string L2.If it is abnormal that short circuit or open circuit etc. occurs in light emitting diode string L2
Situation, then detection unit 120 will detect that the feedback voltage V cs of light emitting diode string L2 is abnormal, and according to abnormal feedback electricity
Pressure Vcs is to export control signal Scon, and then, correction unit 130 receives control signal Scon to control pull-up unit 110, makes
The electric current I2 of light emitting diode string L2 is directed to low-voltage load RL by the guiding module 112 for obtaining pull-up unit 110, and can be reduced
The input current of low-voltage load RL.It should be noted that for ease of understanding, low-voltage, which is carried on this, to be sentenced equivalent resistance RL and is subject to
It indicates, not low-voltage load is resistance.In addition, pull-up unit 110, which can provide voltage Vin, gives light emitting diode string L2, it is above
The voltage for drawing the lower end light emitting diode string L2 uses the cross-pressure for reducing the both ends light emitting diode string L2, thus avoids increasing whole
Power consumption and generate additional heat.
Fig. 3 is the partial circuit that a kind of detection and means for correcting as shown in Figure 1 are painted according to yet another embodiment of the invention
Schematic diagram.As shown, detection unit 120 includes short circuit detector 126 and determining device 128, correction unit 130 is led comprising electric current
Lead device 131, brightness adjustment device 136 and exception control device 138.In in connection relationship, short circuit detector 126 is coupled to determining device
128, electric current guide 131 is coupled to short circuit detector 126 and determining device 128, and brightness adjustment device 136 is coupled to short circuit detector
126 and IC bus interface 180.Exception control device 138 is coupled to determining device 128.
In in electrically operation, short circuit detector 126 is to detect and compare those feedback voltage Vs csn and short circuit with reference to electricity
Pressure detects signal Sd with output.Determining device 128 is to export control signal Scon according to detection signal Sd.In addition, correction is single
Member 130 electric current guide 131 to according to control signal Scon with output steering signal Sr (comprising in Fig. 1 signal Sr1,
Sr2) carry out the pull-up unit 110 of control figure 1,2 so that pull-up unit 110 electric current of particular led string is directed to it is low
Voltage loads RL.Brightness adjustment device 136 to according to detection signal Sd and IC bus interface 180 transmit come setting value
Ds controls brightness to adjust the electric current of short circuit and non-shorting light emitting diode string.Exception control device 138 is to receive simultaneously root
According to control signal Scon with output error signal Sf, so that detection and means for correcting 100 persistently control those light emitting diode strings
L1~Ln.
Fig. 4 is the partial circuit that a kind of detection and means for correcting as shown in Figure 1 are painted according to further embodiment of this invention
Schematic diagram.As shown, determining device 128 includes multiplexer 125 and multiple comparator 127A~127C.Multiplexer 125 is coupled to
Comparator 127B, 127C.Multiplexer 125 to receive detection signal Sd and feedback voltage V csn, and according to detection signal Sd with
Export a specific voltage Vs of feedback voltage V csn.Comparator 127A~127C is to receive and compare specific voltage Vs, input
Relationship between voltage Vin/Reuse controls signal Scon (such as signal A, B, C) with output, is compared judgement for subsequent conditioning circuit.
In one embodiment, multiplexer 125 is to receive detection signal Sd and feedback voltage V csn and accordingly output specific voltage Vs work
For signal D, it is used for exception control.Above-mentioned signal D can be supplied to error control unit (not shown), this error control unit
When receiving signal D, output error signal can be continued to system end, learnt in this way, which maintenance personal can pass through system end reading
Light emitting diode string L1~Ln breaks down.
Fig. 5 is the partial circuit that a kind of detection and means for correcting as shown in Figure 1 are painted according to another embodiment of the present invention
Schematic diagram.As shown, correction unit 130 includes logic judging device 132 and de-multiplexer 134.Logic judging device 132 is coupled to
De-multiplexer 134.Logic judging device 132 is to receive and export switching letter according to control signal Scon (such as signal A, B, C)
Number Sw1, Sw2.De-multiplexer 134 is coupled to receive and switch according to switching signal Sw1, Sw2 the pull-up unit 110 of Fig. 1
In particular led string.
For example, referring to Figure 4 together with Fig. 5, if light emitting diode string L2 occur short circuit or open circuit etc. abnormal cases,
Multiplexer 125 is according to detection signal Sd with the specific voltage Vs in the feedback voltage V csn of output light emitting diode string L1~Ln
(such as Vcs2).Comparator 127A is to receive and compare input voltage vin/Reuse, in addition, comparator 127B, 127C are to connect
Receive and compare specific voltage Vs (such as Vcs2) and input voltage vin/Reuse, with output control signal Scon (such as signal A, B,
C).Then, logic judging device 132 is to receive and according to control signal Scon (such as signal A, B, C) to export switching signal
Sw1,Sw2.De-multiplexer 134 to receive and according to switching signal Sw1, Sw2 with output adjustment signal Sr1, Sr2 to Fig. 1's
Pull-up unit 110, and switch the pull-up unit 110 of Fig. 1 to be coupled to particular led string.
Fig. 6 is is painted a kind of detection and means for correcting and its light emitting diode string for being controlled according to one embodiment of the invention
Schematic diagram.Compared to detection shown in FIG. 1 and means for correcting 100, detection shown in fig. 6 and means for correcting 100A are further included out
Close unit 140.For example, if open circuit abnormal case, the open circuit detector of detection unit 120 occurs in light emitting diode string L2
124 will detect that the feedback voltage V cs of light emitting diode string L2 is abnormal, and according to abnormal feedback voltage V cs to export control
Signal Scon, then, correction unit 130 receive control signal Scon with control switch unit 140 with by light emitting diode string L2
Electric current be directed to low-voltage load so that the abnormal light emitting diode string L2 of open circuit has new current path that can circulate, and
Without turn off light emitting diode string L2, the picture brightness that not will cause display device is uneven.
For example, if the diode L27 damage of light emitting diode string L2 causes to open a way, it can pass through diode L27 originally
It has directly been not present towards the current path that diode L28 circulates, can control open switch SW23 at this time, to bypass diode L27,
The electric current of light emitting diode string L2 is directly directed to low-voltage load by diode L26.In another embodiment, if shine two
The diode L21 damage of pole pipe string L2 causes to open a way, and can pass through the electric current that diode L21 directly circulates towards diode L22 originally
Path has been not present, and can control open switch SW21, SW22 at this time, is powered by power supply VLED towards diode L23, at this point, electric current
Switch SW22 is flowed by diode L23 and flowed through towards diode L24, and the electric current of light emitting diode string L2 is directed to low-voltage
Load.In another embodiment, switch unit 140 also include other switch SW24, SW25, in light emitting diode string L2 not
With diode damage lead to open circuit when, steering current path again so that the abnormal light emitting diode string L2 of open circuit have it is new
Current path can circulate, and without closing light emitting diode string L2, the picture brightness that not will cause display device is uneven.So
The present invention is not limited with the configuration mode of switch shown in fig. 6, only to illustratively illustrate implementation of the invention it
One.
Fig. 7 is the partial circuit that one kind detection as shown in FIG. 6 and means for correcting are painted according to another embodiment of the present invention
Schematic diagram.Referring to Fig. 7, detection unit 120 includes open circuit detector 124, short circuit detector 126 and determining device 128.Correction is single
Member 130 includes short circuit current guide 131, open-circuit current guide 133, brightness adjustment device 136 and exception control device 138.In
In connection relationship, open circuit detector 124 and short circuit detector 126 are all coupled to determining device 128,131 coupling of short circuit current guide
It is connected to short circuit detector 126 and determining device 128, open-circuit current guide 133 is coupled to open circuit detector 124, brightness adjustment device
136 are coupled to short circuit detector 126 and IC bus interface 180.Exception control device 138 is coupled to open circuit detector 124
And determining device 128.
In in electrically operation, referring to Figure 6 together with Fig. 7, open circuit detector 124 is to detect and compare those feedback electricity
Vcsn and open circuit reference voltage are pressed, signal Sd1 is detected with output.Switch unit 140 shines to be switchably coupled to those
Diode string L1~Ln.In addition, the open-circuit current guide 133 of correction unit 130 receives and according to detection signal Sd1, with defeated
Control signal Sr1 is with control switch unit 140 the electric current of particular led string is directed to low-voltage load out.One
In embodiment, the voltage value of above-mentioned short circuit reference voltage is higher than the voltage value of open circuit reference voltage.It should be noted that Fig. 6 and Fig. 7
In, have the element of same names and label with previous embodiment, with similar electrical operation, to make this case illustrate letters
It is clean, it is not repeated in this.
By aforementioned present invention embodiment it is found that the application present invention has following advantages.The embodiment of the present invention is by offer
A kind of detection and means for correcting, using improves after abnormal luminous diode string is closed, and the picture brightness of display device is uneven
And the problem of influencing the perception of user.
Although disclosing specific embodiments of the present invention in embodiment above, it is not intended to limit the invention, this
The technical staff of technical field that the present invention belongs to, in the case of not departing from the principle of the present invention and spirit, when can be carried out respectively to it
It kind changes and modification, therefore protection scope of the present invention is when being subject to subsidiary those as defined in claim.
Claims (8)
1. a kind of detection and means for correcting, to detect a plurality of light emitting diode string, which is characterized in that those light emitting diode strings
One end receiving an input voltage, include:
One pull-up unit, to be switchably coupled to those light emitting diode strings；
One detection unit, to detect the feedback voltage of those light emitting diode strings, according to those feedback voltages to export a control
Signal processed；The detection unit includes: a short circuit detector, to detect and compare those feedback voltages and a short circuit with reference to electricity
Pressure, with one detection signal of output；And a determining device, to export the control signal according to the detection signal；And
One correction unit, to receive the control signal to control the pull-up unit, so that the pull-up unit is switched over coupling
It is connected to a particular led string, and pulls up the voltage of the other end of the particular led string；
Wherein, which includes: a multiplexer, to receive the detection signal and those feedback voltages, and according to the detection
Signal is to export a specific voltage of those feedback voltages；And multiple comparators, to receive and compare the specific voltage with
One input voltage, to export the control signal.
2. detection as described in claim 1 and means for correcting, which is characterized in that the pull-up unit is also to specific luminous by this
The electric current of diode string is directed to low-voltage load.
3. detection as described in claim 1 and means for correcting, which is characterized in that the correction unit includes:
One logic judging device, to receive and according to the control signal to export a switching signal；And
One de-multiplexer makes the pull-up unit be coupled to this to receive and switch according to the switching signal pull-up unit
Particular led string.
4. detection as claimed in claim 3 and means for correcting, which is characterized in that the detection unit includes:
One open circuit detector, to detect and compare those feedback voltages and an open circuit reference voltage, to export the control signal.
5. detection as claimed in claim 4 and means for correcting, which is characterized in that also include:
One switch unit, to be switchably coupled to those light emitting diode strings；
Wherein the correction unit controls the switch unit according to the control signal with by the electric current of the particular led string
It is directed to low-voltage load.
6. detection as claimed in claim 5 and means for correcting, which is characterized in that the correction unit further includes:
One brightness adjustment device, to receive and according to the brightness of the control signal to adjust those light emitting diode strings.
7. detection as claimed in claim 6 and means for correcting, which is characterized in that the correction unit also includes:
One exception control device, to receive and according to the control signal to export an error signal, so that the detection and correction dress
Set lasting those light emitting diode strings of control.
8. detection as claimed in claim 7 and means for correcting, which is characterized in that the voltage value of the short circuit reference voltage is higher than should
The voltage value of open circuit reference voltage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW105113660 | 2016-05-02 | ||
| TW105113660A TWI587738B (en) | 2016-05-02 | 2016-05-02 | Detection and correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105931592A CN105931592A (en) | 2016-09-07 |
| CN105931592B true CN105931592B (en) | 2019-03-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610554421.8A Expired - Fee Related CN105931592B (en) | 2016-05-02 | 2016-07-14 | Detection and correction device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105931592B (en) |
| TW (1) | TWI587738B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI690746B (en) * | 2018-12-12 | 2020-04-11 | 友達光電股份有限公司 | Display device and operating method thereof |
| JP2020106632A (en) * | 2018-12-27 | 2020-07-09 | セイコーエプソン株式会社 | Liquid crystal device, electronic apparatus, and movable body |
| CN116110332A (en) * | 2023-04-11 | 2023-05-12 | 成都利普芯微电子有限公司 | Constant current source driving chip, driving circuit and display device |
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| KR20140132215A (en) * | 2013-05-07 | 2014-11-17 | 노란영 | Led driving circuit |
| CN104883796A (en) * | 2015-06-11 | 2015-09-02 | 友达光电股份有限公司 | LED driver and driving method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105931592A (en) | 2016-09-07 |
| TW201740769A (en) | 2017-11-16 |
| TWI587738B (en) | 2017-06-11 |
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