CN109801576A - A kind of LED drive chip open detection circuit - Google Patents
A kind of LED drive chip open detection circuit Download PDFInfo
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- CN109801576A CN109801576A CN201910271955.3A CN201910271955A CN109801576A CN 109801576 A CN109801576 A CN 109801576A CN 201910271955 A CN201910271955 A CN 201910271955A CN 109801576 A CN109801576 A CN 109801576A
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Abstract
The present invention discloses a kind of LED drive chip open detection circuit, belongs to field of circuit technology.The LED drive chip open detection circuit includes open circuit detection digital circuit and open circuit detection analog circuit.Enable signal EN, reset signal RST, open circuit signaling OPEN of the open circuit detection digital circuit according to input record the location information of open circuit LED light in clock GCLK rising edge, output PWM are handled, is shown in the output that next subcycle shields paths of LEDs.OUT signal of the open circuit detection analog circuit according to LED light, judges whether its working condition opens a way, and generates open circuit signaling OPEN and be transferred to open circuit detection digital circuit, while resetting it is determined that being the OPEN signal of open-circuit condition.The present invention solves the problems, such as small space distance LED display screen open circuit cross, reduces detection complexity, improves detection accuracy, reduce circuit power consumption, reduces circuit area, and be applied successfully.
Description
Technical field
The present invention relates to field of circuit technology, in particular to a kind of LED drive chip open detection circuit.
Background technique
LED is low in energy consumption by its, the service life is long, small in size, at low cost, highly effective and safe as novel semi-conductor illuminating material
And the advantages that green non-pollution, it is used widely in lighting apparatus, display screen and other electronic equipments.
Dot space distance LED display screen has clear seamless spliced, color natural reality, picture, modularization maintenance, display equal
Even property it is good the advantages that, meet display screen to high-resolution, high fine and smooth and the needs of closely appreciate display effect, be increasingly becoming and grind
Study carefully hot spot.There is multiple constant current LED drive chip good matching, accurate current control, high gray scale to show, splendid display effect etc.
Advantage is used widely in small spacing LED drive chip.
In small space distance LED display screen, it's the control LED light/dark time pasts multiple constant current LED drive chip multi-pass, reaches
The display effect of different gray-scale intensities.When carrying out the display of low order gray scale, due to the influence of parasitic capacitance, it may appear that ghost, low
The display defects such as grey white balance colour cast, first trip are partially dark, low ash color lump is uneven, open circuit cross.Small spacing LED generates open circuit cross
The basic reason of frame is because the influence of parasitic capacitance can suitably reduce the big of parasitic capacitance by cabling on layout
It is small, but it can not be made to completely eliminate.For smaller spacing, cabling is more intensive, and the influence of parasitic capacitance is bigger.Secondly lamp sheet
There is also parasitic capacitances for body, so different lamps, the shown effect come out also can be different.
Cross phenomenon caused by LED bad point quite perplexs display screen terminal user, the design especially swept in high row,
Other than the lamp point mistake that horizontal direction extends is bright, the lamp point of vertical direction misses the bright total number that can also accompany and gets higher and prolong cross phenomenon
It stretches, small spacing screen is passed through frequently with the design swept higher than 16 rows, and when having LED bad point to occur, cross phenomenon can be quite obvious,
Cause display picture flaw, poor display effect.
Summary of the invention
The purpose of the present invention is to provide a kind of LED drive chip open detection circuits, are applied to dot spacing multichannel
Constant-current LED driving chip solves the problems, such as open circuit cross, makes to show that picture is more clear, is fine and smooth true.
In order to solve the above technical problems, the present invention provides a kind of LED drive chip open detection circuit, comprising:
Open circuit detection digital circuit, record open circuit LED location, and shield corresponding position PWM display output；
Open circuit detection analog circuit, judges LED light open-circuit condition, and generate/remove open circuit signaling OPEN.
Optionally, the open circuit detection digital circuit includes:
Enabled processing circuit, it is enabled for handling open circuit detection；
Open circuit signaling synchronous circuit, for synchronous input OPEN signal；
Open-circuit position writing circuit, for recording open circuit LED light position；
Shielding open circuit output circuit, the PWM for shielding paths of LEDs are exported.
Optionally, the enabled processing circuit detects enable signal EN, PWM cycle count signal according to the open circuit of input
CNT1 and CNT2 generates open circuit detection signal in first subcycle of every a line, carries out open circuit detection.
Optionally, the OPEN signal that the open circuit signaling synchronous circuit generates the open circuit detection analog circuit,
GCLK rising edge clock synchronizes processing, and the signal after synchronization is passed to the open-circuit position writing circuit.
Optionally, the open-circuit position writing circuit defines 32 × 16 registers, line by line each channel traversal, will be corresponding
The register of open-circuit position is set to 1, remaining keeps 0.
Optionally, the shielding open circuit output circuit carries out selection processing in final PWM output end, if the position is opened a way,
Then shield position output；Otherwise the gradation data after normal output is broken up.
Optionally, the open circuit detection analog circuit includes:
Open-circuit condition detection circuit detects OUT terminal LED state, judges whether to open a way；
PWM processing circuit handles the PWN signal of number transmitting；
Disappear shadow circuit, eliminates ghost under circuit；
Open circuit signaling generative circuit, generation/removing open circuit detection signal OPEN.
Optionally, it in the open-circuit condition detection circuit, as output end OUT=0, after comparator, generates open circuit and sentences
Break signal OUT_O=1 passes to the open circuit signaling generative circuit.
Optionally, the PWM processing circuit extends the pwm signal that numerical portion transmits, and completes the inclined shadow of first trip
Section, low ash white balance adjusting.
Optionally, the OUT_O that the open circuit signaling generative circuit is exported according to the open-circuit condition detection circuit, in PWM
Rising edge, generate the OPEN signal of high level, which follows PWM cycle to change, open circuit detection after the completion of, the position
Open circuit detection is no longer carried out, OPEN signal remains unchanged.
A kind of LED drive chip open detection circuit is provided in the present invention, including open circuit detects digital circuit and opens
Detect analog circuit in road.Enable signal EN, reset signal RST, open circuit signaling OPEN of the open circuit detection digital circuit according to input,
The location information of open circuit LED light is recorded in clock GCLK rising edge, output PWM is handled, is shielded in next subcycle
The output of open circuit LED is shown.OUT signal of the open circuit detection analog circuit according to LED light, judges whether its working condition opens a way,
And it generates open circuit signaling OPEN and is transferred to open circuit detection digital circuit, while resetting it is determined that the OPEN for open-circuit condition believes
Number.
The beneficial effects of the present invention are:
(1) for the existing cross problem of opening a way of small space distance LED display screen, new detection circuit is devised, from basic
It is upper to solve the problems, such as open circuit cross；
(2) testing process is optimized, reduces the complexity of detection；
(3) mode for shielding open circuit output from output end is taken, circuit power consumption is reduced, reduces circuit area；
(4) special register is defined to all positions, it is ensured that detection accuracy is not in that error detection, leak detection etc. are asked
Topic improves detection accuracy.
Detailed description of the invention
Fig. 1 is the general frame figure of LED drive chip open detection circuit provided by the invention；
Fig. 2 is the resultative construction schematic diagram of open circuit detection digital circuit；
Fig. 3 is the resultative construction schematic diagram of open circuit detection analog circuit；
Fig. 4 is open circuit cross list origin cause of formation schematic diagram；
Fig. 5 is open circuit cross transverse direction origin cause of formation schematic diagram；
Fig. 6 is open circuit detection timing diagram；
Fig. 7 is open circuit cross phenomenon output schematic diagram；
Fig. 8 is to export schematic diagram after open circuit cross open circuit detects.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to a kind of LED drive chip open detection circuit proposed by the present invention make into
One step is described in detail.According to following explanation and claims, advantages and features of the invention will be become apparent from.It should be noted that
Attached drawing is all made of very simplified form and using non-accurate ratio, only to convenient, lucidly aid illustration is of the invention
The purpose of embodiment.
Embodiment one
The present invention provides a kind of LED drive chip open detection circuits, are suitable for Multichannel constant-current LED drive chip.
The general frame of the LED drive chip open detection circuit is as shown in Figure 1, include open circuit detection digital circuit and open circuit detection
Analog circuit, the open circuit detection digital circuit record open circuit LED location, and shield corresponding position PWM display output；It is described to open
Road detection analog circuit judges LED light open-circuit condition, and generates/remove open circuit signaling OPEN.
It is illustrated in figure 2 the structural schematic diagram of the open circuit detection digital circuit, the open circuit detection digital circuit includes
Enabled processing circuit, open circuit signaling synchronous circuit, open-circuit position writing circuit and shielding open circuit output circuit.The enabled processing
Circuit is enabled for handling open circuit detection；The open circuit signaling synchronous circuit is for synchronous input OPEN signal；The open circuit position
Set writing circuit record open circuit LED light position；The shielding open circuit output circuit shields the PWM output of paths of LEDs.
Specifically, the enabled processing circuit detects enable signal EN, PWM cycle count signal according to the open circuit of input
CNT1 and CNT2 generates open circuit detection signal in first subcycle of every a line, carries out open circuit detection.The open circuit signaling is same
The OPEN signal that step circuit generates the open circuit detection analog circuit, synchronizes processing in GCLK rising edge clock, will be same
Signal after step passes to the open-circuit position writing circuit.The open-circuit position writing circuit defines 32 × 16 deposits
Device, each channel traversal, is set to 1 for the register of corresponding open-circuit position, remaining keeps 0 line by line.The shielding open circuit output electricity
Road carries out selection processing in final PWM output end, if the position is opened a way, shields position output；Otherwise normal output is broken up
Gradation data afterwards.
It is illustrated in figure 3 the structural schematic diagram of the open circuit detection analog circuit, the open circuit detection analog circuit includes
Open-circuit condition detection circuit, PWM processing circuit, disappear shadow circuit and open circuit signaling generative circuit.The open-circuit condition detection circuit,
OUT terminal LED state is detected, judges whether to open a way；The PWM processing circuit handles the PWN signal of number transmitting；The shadow that disappears
Circuit eliminates ghost under circuit；The open circuit signaling generative circuit, generation/removing open circuit detection signal OPEN.
Specifically, as output end OUT=0, after comparator, generating open circuit in the open-circuit condition detection circuit and sentencing
Break signal OUT_O=1 passes to the open circuit signaling generative circuit.The PWM that the PWM processing circuit transmits numerical portion
Signal extends, and completes the inclined shadow section of first trip, low ash white balance adjusting.The shadow circuit that disappears, reserved charging enough when line feed
Time carries out lower ghost and eliminates operation, promotes circuit display effect.The open circuit signaling generative circuit is according to the open-circuit condition
The OUT_O of detection circuit output generates the OPEN signal of high level in the rising edge of PWM, which follows PWM cycle
Variation, after the completion of open circuit detection, which no longer carries out open circuit detection, and OPEN signal remains unchanged.
Fig. 4 show the open circuit cross list origin cause of formation, and in Fig. 4, VLED1 is row voltage, the second row of channels of right-to-left 2
The channel open circuit LED, OUT2 be pulled to 0V, at this time on other rows there are also the voltage of 3V or so, formed 3V pressure difference (when normal work,
LED conducting, the voltage value of OUT2 is not 0, is not enough to drive other LED with the pressure difference of other rows), cause intermediate lamp to have micro- lead
It is logical.Fig. 5 show the open circuit cross transverse direction origin cause of formation, and VLED1 is row voltage, and open a way LED, and the channel OUT2 is pulled to 0V, due to coupling
The reason of, other column on channel voltages also can be impacted and reduces, cause centre lamp have lightly conducting.
Fig. 1 show the general frame figure of LED drive chip open detection circuit, and open circuit detection analog circuit is for detecting
Open circuit lamp bead, generates OPEN signal, and open circuit detection digital circuit shields the output of respective channel according to OPEN signal.Wherein OUT
For circuit output pin, low expression open circuit；OPEN is open-circuit condition, and height indicates open circuit；RST is open-circuit condition reset signal, on
It rises along effective；EN is open circuit detection enable signal, and height indicates enabled；GCLK is clock input signal, is opened a way for internal shield
Channel；PWM is numerical portion output.
EN is drawn high, after some LED lamp bead open circuit, OUT is lower than a certain value, analog circuit is detected by open circuit, PWM's
Rising edge, OPEN signal are drawn high, and detect open-circuit condition, and remain to next PWM cycle；In open circuit detection digital circuit note
This open-circuit condition is recorded, when the position is arrived in scanning next time, shielding PWM output, PWM output in the position is always low, OPEN
Signal is no longer drawn high, and is kept low.Sequential relationship is as shown in fig. 6, position 1 is open-circuit condition, and after detecting open circuit, OPEN signal is drawn
Height, then when scanning is to position 1 next time, shielding PWM output, OPEN signal is also no longer drawn high.
Fig. 2 is the functional block diagram of open circuit detection digital circuit.The open circuit detection digital circuit mainly completes open circuit LED light
Pearl position record, and the PWM output in next cycle shielding corresponding position.To simplify detection complexity of opening a way, detection is improved
Accuracy, while reducing area.Carrying out open circuit detection must satisfy the following conditions: (1) enabling open circuit detection, i.e. EN=1；(2)
The open circuit signaling OPEN=1 that analog portion comes；(3) must be when channel to be opened, i.e. PWM output is high.
Processing circuit is enabled described in Fig. 2, LED drive chip is to improve refresh rate, the entire display cycle is passed through corresponding
PWM algorithm is dispersed as multiple subcycles.Circuit designed by the present invention only in first subcycle carries out open circuit detection, by CNT1,
CNT2 and EN combination control can reduce chip power-consumption under the premise of guaranteeing to detect accuracy.The open circuit signaling synchronizes electricity
Road synchronizes processing to OPEN signal, guarantees timing reliability requirement.The open-circuit position writing circuit defines 32 × 16
A (32 rows, every 16 channel of row) register, when open circuit detects, each channel is traversed line by line, by the register of corresponding open-circuit position
It is set to 1, remaining keeps 0, it is ensured that even if there are burrs for simulation OPEN signal, error detection, the feelings of leak detection will not occur
Condition improves accuracy.The shielding is opened a way output circuit, in existing LED product, shielding open circuit output circuit be usually to
Data 0 are written in corresponding position in SRAM, then PWM is not exported, but this processing mode increases a large amount of SRAM read-write operations and patrols
Volume, increase chip area.The invention proposes new solutions, carry out selection processing in final PWM output end, if should
Position open circuit then shields position output, the gradation data PWM_T after otherwise normal output is broken up.Open circuit detection digital circuit
Real-time detection is supported simultaneously, and RST is that open-circuit condition resets operation, and rising edge is effective, removes all open-circuit conditions originally recorded.
Fig. 3 is the functional block diagram of open circuit detection analog circuit, and the open circuit detection analog circuit mainly completes detection LED shape
State judges whether to open a way, and generates OPEN signal, and after determining open-circuit condition, next subcycle is shown to the open circuit position
When setting, PWM=0, OUT will not be 0, in this way other rows would not by overdue bright, so that cross phenomenon of opening a way will not be generated,
Simplified pinciple block diagram is as shown in Figure 8.Wherein, enough charging time are reserved when the electronic shadow circuit that disappears passes through line feed, carry out lower ghost
Eliminate operation；The PWM processing circuit extends the pwm signal that numerical portion transmits, and completes the inclined shadow section of first trip, low ash
The operation such as white balance adjusting；The open circuit signaling generative circuit generates the OPEN signal used for digital circuit.
When LED is in open-circuit condition, OUT=0, the value (being typically set at 0.3V) lower than VDS, after comparator,
OUT_O is drawn high, and is transferred to the open circuit signaling generative circuit.In the failing edge of PWM_B, generated by open circuit signaling generative circuit high
The OPEN signal of level, the signal follow PWM cycle to change, as shown in figure 3, being transmitted to the open circuit detection digital circuit, warp
After the open circuit detects digital processing of circuit, pwm signal is dragged down, and after PWM processing circuit, VG_PWM signal is low, switching tube
It is in close state, OUT is no longer 0；PWM_B is height, and OPEN signal at this time is no longer drawn high, and keeps low level, opens this
Paths no longer detect, directly shielding output display.
Fig. 7 is LED white light open circuit cross phenomenon when white is tiltedly swept in practical application, after Fig. 8 open circuit cross is eliminated
Actual displayed effect picture.The chip that the practical application present invention designs, after opening open circuit detection, it is seen that open circuit cross is disappeared completely
It removes.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (10)
1. a kind of LED drive chip open detection circuit characterized by comprising
Open circuit detection digital circuit, record open circuit LED location, and shield corresponding position PWM display output；
Open circuit detection analog circuit, judges LED light open-circuit condition, and generate/remove open circuit signaling OPEN.
2. LED drive chip open detection circuit as described in claim 1, which is characterized in that the open circuit detection number electricity
Road includes:
Enabled processing circuit, it is enabled for handling open circuit detection；
Open circuit signaling synchronous circuit, for synchronous input OPEN signal；
Open-circuit position writing circuit, for recording open circuit LED light position；
Shielding open circuit output circuit, the PWM for shielding paths of LEDs are exported.
3. LED drive chip open detection circuit as claimed in claim 2, which is characterized in that the enabled processing circuit root
Enable signal EN, PWM cycle count signal CNT1 and CNT2 are detected according to the open circuit of input, is produced in first subcycle of every a line
Raw open circuit detection signal, carries out open circuit detection.
4. LED drive chip open detection circuit as claimed in claim 2, which is characterized in that the open circuit signaling synchronizes electricity
The OPEN signal that road generates the open circuit detection analog circuit, synchronizes processing in GCLK rising edge clock, will synchronize it
Signal afterwards passes to the open-circuit position writing circuit.
5. LED drive chip open detection circuit as claimed in claim 4, which is characterized in that the open-circuit position record electricity
Road defines 32 × 16 registers, and each channel traversal, is set to 1 for the register of corresponding open-circuit position, remaining keeps 0 line by line.
6. LED drive chip open detection circuit as claimed in claim 2, which is characterized in that the shielding open circuit output electricity
Road carries out selection processing in final PWM output end, if the position is opened a way, shields position output；Otherwise normal output is broken up
Gradation data afterwards.
7. LED drive chip open detection circuit as described in claim 1, which is characterized in that the open circuit detection simulation electricity
Road includes:
Open-circuit condition detection circuit detects OUT terminal LED state, judges whether to open a way；
PWM processing circuit handles the PWN signal of number transmitting；
Disappear shadow circuit, eliminates ghost under circuit；
Open circuit signaling generative circuit, generation/removing open circuit detection signal OPEN.
8. LED drive chip open detection circuit as claimed in claim 7, which is characterized in that the open-circuit condition detection electricity
Lu Zhong after comparator, generates open circuit and judges signal OUT_O=1, pass to the open circuit signaling as output end OUT=0
Generative circuit.
9. LED drive chip open detection circuit as claimed in claim 7, which is characterized in that the PWM processing circuit will count
The pwm signal of character segment transmitting extends, and completes the inclined shadow section of first trip, low ash white balance adjusting.
10. LED drive chip open detection circuit as claimed in claim 7, which is characterized in that the open circuit signaling generates electricity
The OUT_O that road is exported according to the open-circuit condition detection circuit generates the OPEN signal of high level in the rising edge of PWM, should
OPEN signal follows PWM cycle to change, and after the completion of open circuit detection, which no longer carries out open circuit detection, and OPEN signal is kept not
Become.
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| CN201910271955.3A CN109801576B (en) | 2019-04-04 | 2019-04-04 | LED driver chip detection circuitry that opens a way |
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| CN201910271955.3A CN109801576B (en) | 2019-04-04 | 2019-04-04 | LED driver chip detection circuitry that opens a way |
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Cited By (4)
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| CN113470555A (en) * | 2021-07-15 | 2021-10-01 | 中科芯集成电路有限公司 | LED display driving chip open-circuit lamp bead detection method |
| CN114023250A (en) * | 2021-11-10 | 2022-02-08 | 成都利普芯微电子有限公司 | Driving chip, display assembly and driving method |
| CN115249457A (en) * | 2022-01-21 | 2022-10-28 | 中科芯集成电路有限公司 | Driving method for displaying any group number on LED screen |
| 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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