CN109801576B - LED driver chip detection circuitry that opens a way - Google Patents
LED driver chip detection circuitry that opens a way Download PDFInfo
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- CN109801576B CN109801576B CN201910271955.3A CN201910271955A CN109801576B CN 109801576 B CN109801576 B CN 109801576B CN 201910271955 A CN201910271955 A CN 201910271955A CN 109801576 B CN109801576 B CN 109801576B
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Abstract
The invention discloses an LED driving chip open circuit detection circuit, and belongs to the technical field of circuits. The LED driving chip open circuit detection circuit comprises an open circuit detection digital circuit and an open circuit detection analog circuit. The OPEN circuit detection digital circuit records position information of the OPEN circuit LED lamp at the rising edge of the clock GCLK according to the input enabling signal EN, the reset signal RST and the OPEN circuit signal OPEN, processes the output PWM and shields the output display of the OPEN circuit LED in the next sub-period. The OPEN circuit detection analog circuit judges whether the working state of the LED lamp is OPEN or not according to the OUT signal of the LED lamp, generates an OPEN circuit signal OPEN and transmits the OPEN circuit signal OPEN to the OPEN circuit detection digital circuit, and meanwhile resets the OPEN signal which is judged to be in the OPEN circuit state. The invention solves the problem of the open cross of the small-spacing LED display screen, reduces the detection complexity, improves the detection accuracy, reduces the circuit power consumption, reduces the circuit area and is successfully applied.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to an open-circuit detection circuit for an LED driving chip.
Background
As a novel semiconductor lighting material, the LED is widely applied to lighting equipment, display screens and other electronic equipment by virtue of the advantages of low power consumption, long service life, small size, low cost, high efficiency, safety, greenness, no pollution and the like.
The LED display screen with the small dot spacing has the advantages of seamless splicing, natural and real color, clear picture, modularized maintenance, good display uniformity and the like, meets the requirements of the display screen on high definition, high fineness and close range appreciation of the display effect, and gradually becomes a research hotspot. The multi-path constant-current LED driving chip has the advantages of good matching, accurate current control, high gray scale display, excellent display effect and the like, and is widely applied to small-spacing LED driving chips.
In the small-spacing LED display screen, the multi-path constant-current LED driving chip achieves the display effect of different gray-scale brightness by controlling the bright/dark time of the LED. When low-order gray scale display is carried out, due to the influence of parasitic capacitance, display defects such as ghost, low gray white balance color cast, dark first line, uneven low gray color block, open cross and the like can occur. The fundamental reason why the small-pitch LED generates the open cross is that the parasitic capacitance is affected, and on layout, the size of the parasitic capacitance can be properly reduced by routing, but cannot be completely eliminated. For smaller pitches, the more dense the traces, the greater the effect of parasitic capacitance. Secondly, parasitic capacitance exists in the lamp, so that different lamps have different displayed effects.
The cross phenomenon that LED bad point caused is very puzzled to display screen end user, especially in the design of high line scanning, the lamp mistake that the cross phenomenon except that the horizontal direction extends is lighted, and the lamp mistake of vertical direction is lighted and also can be gone with the line and sweep the number and become high and extend, and the design of sweeping more than 16 lines is often adopted to the booth apart from the screen, and in case when having LED bad point to appear, the cross phenomenon can be very obvious, causes the display screen flaw, and the display effect is not good.
Disclosure of Invention
The invention aims to provide an LED driving chip open circuit detection circuit which is applied to a small-dot-pitch multi-channel constant current LED driving chip, solves the problem of an open circuit cross and enables a display picture to be clearer, finer and more real.
In order to solve the above technical problem, the present invention provides an open circuit detection circuit for an LED driving chip, including:
the open circuit detection digital circuit records the open circuit LED position and shields PWM display output at the corresponding position;
and the OPEN circuit detection analog circuit judges the OPEN circuit state of the LED lamp and generates/clears an OPEN circuit signal OPEN.
Optionally, the open circuit detection digital circuit includes:
an enable processing circuit for processing an open detection enable;
the OPEN-circuit signal synchronization circuit is used for synchronously inputting an OPEN signal;
the open-circuit position recording circuit is used for recording the position of the open-circuit LED lamp;
and the shielding open-circuit output circuit is used for shielding the PWM output of the open-circuit LED.
Optionally, the enable processing circuit generates an open circuit detection signal in the first sub-period of each row according to the input open circuit detection enable signal EN, the PWM period count signals CNT1 and CNT2, so as to perform open circuit detection.
Optionally, the OPEN-circuit signal synchronizing circuit synchronizes the OPEN signal generated by the OPEN detection analog circuit at a rising edge of the GCLK clock, and transmits the synchronized signal to the OPEN position recording circuit.
Optionally, the open-circuit position recording circuit defines 32 × 16 registers, traverses each channel row by row, sets the register of the corresponding open-circuit position to 1, and keeps 0 for the rest.
Optionally, the shielding open-circuit output circuit performs selection processing at the final PWM output end, and if the position is open-circuit, the position output is shielded; otherwise, normally outputting the scattered gray data.
Optionally, the open circuit detection analog circuit includes:
the open circuit state detection circuit detects the state of the OUT end LED and judges whether the open circuit exists or not;
a PWM processing circuit for processing the digitally transferred PWN signal;
a ghost eliminating circuit for eliminating ghost image;
and an OPEN-circuit signal generating circuit for generating/clearing the OPEN-circuit detection signal OPEN.
Optionally, in the open-circuit state detection circuit, when the output end OUT is equal to 0, after passing through the comparator, the open-circuit determination signal OUT _ O is equal to 1, and is transmitted to the open-circuit signal generation circuit.
Optionally, the PWM processing circuit extends the PWM signal transmitted by the digital part to complete the first row dimming adjustment and the low gray-white balance adjustment.
Optionally, the OPEN-circuit signal generating circuit generates an OPEN signal of a high level at a rising edge of the PWM according to OUT _ O output by the OPEN-circuit state detecting circuit, the OPEN signal changes along with a PWM period, after the OPEN detection is completed, the OPEN detection is not performed at the position, and the OPEN signal remains unchanged.
The invention provides an open circuit detection circuit of an LED driving chip, which comprises an open circuit detection digital circuit and an open circuit detection analog circuit. The OPEN circuit detection digital circuit records position information of the OPEN circuit LED lamp at the rising edge of the clock GCLK according to the input enabling signal EN, the reset signal RST and the OPEN circuit signal OPEN, processes the output PWM and shields the output display of the OPEN circuit LED in the next sub-period. The OPEN circuit detection analog circuit judges whether the working state of the LED lamp is OPEN or not according to the OUT signal of the LED lamp, generates an OPEN circuit signal OPEN and transmits the OPEN circuit signal OPEN to the OPEN circuit detection digital circuit, and meanwhile resets the OPEN signal which is judged to be in the OPEN circuit state.
The invention has the beneficial effects that:
(1) aiming at the problem of an open cross existing in a small-spacing LED display screen, a new detection circuit is designed, so that the problem of the open cross is fundamentally solved;
(2) the detection process is optimized, so that the detection complexity is reduced;
(3) the mode of shielding open circuit output from the output end is adopted, so that the power consumption of the circuit is reduced, and the area of the circuit is reduced;
(4) special registers are defined for all positions, so that the detection accuracy is ensured, the problems of false detection, missing detection and the like are avoided, and the detection accuracy is improved.
Drawings
FIG. 1 is a general architecture diagram of an open circuit detection circuit for an LED driver chip according to the present invention;
FIG. 2 is a schematic diagram of the resulting structure of the open circuit detection digital circuit;
FIG. 3 is a schematic diagram of the resulting structure of an open circuit detection analog circuit;
FIG. 4 is a schematic diagram of the cause of an open cross column;
FIG. 5 is a schematic view of the transverse cause of the open cross;
FIG. 6 is a timing diagram for open circuit detection;
FIG. 7 is a schematic diagram of an output of an open cross phenomenon;
fig. 8 is a schematic output diagram after open cross open detection.
Detailed Description
The following describes an open-circuit detection circuit of an LED driving chip according to the present invention in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
The invention provides an LED driving chip open circuit detection circuit which is suitable for a multi-channel constant current LED driving chip. The overall architecture of the LED driving chip open circuit detection circuit is shown in FIG. 1, and the LED driving chip open circuit detection circuit comprises an open circuit detection digital circuit and an open circuit detection analog circuit, wherein the open circuit detection digital circuit records the open circuit LED position and shields PWM display output at the corresponding position; the OPEN circuit detection analog circuit judges the OPEN circuit state of the LED lamp and generates/clears an OPEN circuit signal OPEN.
Fig. 2 is a schematic structural diagram of the open circuit detection digital circuit, which includes an enable processing circuit, an open signal synchronization circuit, an open position recording circuit, and a shielded open output circuit. The enabling processing circuit is used for processing open circuit detection enabling; the OPEN-circuit signal synchronous circuit is used for synchronously inputting an OPEN signal; the open-circuit position recording circuit records the position of the open-circuit LED lamp; the shielding open circuit output circuit shields the PWM output of the open circuit LED.
Specifically, the enable processing circuit generates an open circuit detection signal in the first sub-period of each row according to the input open circuit detection enable signal EN and the PWM period count signals CNT1 and CNT2, and performs open circuit detection. The OPEN circuit signal synchronization circuit carries out synchronization processing on the OPEN signal generated by the OPEN circuit detection analog circuit on the rising edge of a GCLK clock, and transmits the synchronized signal to the OPEN circuit position recording circuit. The open circuit position recording circuit defines 32 × 16 registers, traverses each channel row by row, sets the register of the corresponding open circuit position to 1, and keeps 0 for the rest. The shielding open-circuit output circuit performs selection processing on the final PWM output end, and shields the position output if the position is open-circuit; otherwise, normally outputting the scattered gray data.
Fig. 3 is a schematic structural diagram of the open circuit detection analog circuit, which includes an open circuit state detection circuit, a PWM processing circuit, a shadow elimination circuit, and an open circuit signal generation circuit. The open-circuit state detection circuit detects the state of the OUT end LED and judges whether the open circuit exists or not; the PWM processing circuit processes the PWN signal transmitted by the digital transmission; the image elimination circuit eliminates ghost images under the circuit; the OPEN-circuit signal generating circuit generates/clears an OPEN-circuit detection signal OPEN.
Specifically, in the open state detection circuit, when the output terminal OUT is 0, the comparator generates an open determination signal OUT _ O of 1, and the signal is transmitted to the open signal generation circuit. And the PWM processing circuit extends the PWM signal transmitted by the digital part to complete the first row dark adjustment and the low gray white balance adjustment. Sufficient charging time is reserved during line changing of the image elimination circuit, ghost elimination operation is conducted, and circuit display effect is improved. The OPEN-circuit signal generating circuit generates a high-level OPEN signal at the rising edge of PWM according to OUT _ O output by the OPEN-circuit state detecting circuit, the OPEN signal changes along with the PWM period, and after the OPEN-circuit detection is finished, the OPEN-circuit detection is not carried OUT at the position, and the OPEN signal is kept unchanged.
Fig. 4 shows the cause of the open cross column, in fig. 4, VLED1 is the row voltage, the open LED of the second row channel 2 from right to left, the OUT2 channel is pulled to 0V, and there is a voltage around 3V on the other rows, so that a 3V voltage difference is formed (in normal operation, the LED is turned on, the voltage value of OUT2 is not 0, and the voltage difference with the other rows is not enough to drive the other LEDs), resulting in micro-conduction of the middle lamp. Fig. 5 shows the horizontal cause of the open cross, VLED1 is the row voltage, open LED, OUT2 channel is pulled to 0V, and due to coupling, the channel voltages on other columns are affected and decreased, resulting in micro-conduction in the middle lamp.
FIG. 1 shows that LED driver chip detection circuitry's that OPENs a way overall framework is constructed, and the detection analog circuit that OPENs a way is used for detecting the lamp pearl that OPENs a way, produces the OPEN signal, and the detection digital circuit that OPENs a way shields the output of corresponding passageway according to the OPEN signal. Wherein OUT is a circuit output pin, low indicating an open circuit; OPEN is OPEN state, high indicates OPEN; RST is an open-circuit state reset signal, and the rising edge is effective; EN is an open circuit detection enable signal, high indicates enable; GCLK is the clock input signal, used for the internal shield open circuit channel; PWM is the digital part output.
Pulling up EN, when a certain LED lamp bead is in an OPEN circuit, OUT is lower than a certain value, an OPEN circuit detection analog circuit is used, an OPEN signal is pulled up at the rising edge of PWM, an OPEN circuit state is detected, and the next PWM period is kept; when the OPEN circuit detection digital circuit records the OPEN circuit state, and the position is scanned next time, the PWM output is shielded, the PWM output is always low, and the OPEN signal is not pulled high any more and is kept low. The timing relationship is shown in fig. 6, where position 1 is an OPEN circuit state, the OPEN signal is pulled high after an OPEN circuit is detected, and when position 1 is scanned again, the PWM output is masked, and the OPEN signal is not pulled high any more.
Fig. 2 is a functional block diagram of an open circuit detection digital circuit. And the open circuit detection digital circuit is mainly used for recording the position of the open circuit LED lamp bead and shielding PWM output of a corresponding position in the next period. To simplify the complexity of open circuit detection, improve the detection accuracy and reduce the area. The following conditions must be met for open circuit detection: (1) enable open circuit detection, i.e., EN ═ 1; (2) an OPEN-circuit signal OPEN from the analog part is 1; (3) it must be when the channel is open, i.e. the PWM output is high.
In the enable processing circuit shown in fig. 2, the LED driving chip breaks up the whole display period into a plurality of sub-periods by the corresponding PWM algorithm in order to increase the refresh rate. The circuit designed by the invention only carries out open circuit detection in the first sub-period and is controlled by the combination of the CNT1, the CNT2 and the EN, and the power consumption of the chip can be reduced on the premise of ensuring the detection accuracy. The OPEN-circuit signal synchronization circuit carries out synchronous processing on the OPEN signal, and the requirement of time sequence reliability is met. The OPEN circuit position recording circuit defines 32 multiplied by 16 (32 rows, 16 channels in each row) registers, and during OPEN circuit detection, each channel traverses line by line, the register of the corresponding OPEN circuit position is set to be 1, and the rest of the registers are kept to be 0, so that the conditions of false detection and detection omission can be avoided even if burrs exist in an analog OPEN signal, and the accuracy is improved. In the existing LED product, the shielding open-circuit output circuit usually writes data 0 into a corresponding position in an SRAM, and then PWM does not output, but the processing mode increases a large amount of SRAM read-write operation logic and increases the chip area. The invention provides a new solution, which is to select and process the final PWM output end, shield the position output if the position is open-circuited, and normally output the scattered gray data PWM _ T if the position is open-circuited. The open circuit detection digital circuit simultaneously supports real-time detection, RST is reset operation in an open circuit state, the rising edge is effective, and all originally recorded open circuit states are cleared.
Fig. 3 is a schematic block diagram of an OPEN circuit detection analog circuit, which mainly detects the state of an LED, determines whether the LED is OPEN, and generates an OPEN signal, and after the OPEN state is determined, when the next sub-period displays the OPEN position, PWM is 0, and OUT is not 0, so that other rows are not lighted by mistake, and thus an OPEN cross phenomenon is not generated, and a simplified schematic block diagram thereof is shown in fig. 8. The electric shadow elimination circuit reserves enough charging time during line changing to carry out lower ghost elimination operation; the PWM processing circuit extends the PWM signal transmitted by the digital part to complete the operations of first line dark adjustment, low gray white balance adjustment and the like; the OPEN signal generating circuit generates an OPEN signal for use by the digital circuit.
When the LED is in an open state, OUT is 0, which is lower than VDS (usually set to 0.3V), and after passing through the comparator, OUT _ O is pulled high and transmitted to the open signal generating circuit. At the falling edge of PWM _ B, an OPEN-circuit signal generating circuit generates a high-level OPEN signal, which changes along with the PWM period, and as shown in fig. 3, the signal is transmitted to the OPEN-circuit detection digital circuit, after being processed by the OPEN-circuit detection digital circuit, the PWM signal is pulled low, after being processed by the PWM processing circuit, the VG _ PWM signal is low, the switching tube is in the off state, and OUT is no longer 0; PWM _ B is high, the OPEN signal is not pulled high at the moment, the low level is kept, the OPEN channel is not detected any more, and the output display is directly shielded.
Fig. 7 is a diagram illustrating an actual display effect of an open cross of LED white light after the open cross is eliminated, when white is scanned obliquely in practical application. In practical application of the chip designed by the invention, after the open circuit detection is started, the open circuit cross is completely eliminated.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (5)
1. An LED driver chip open circuit detection circuit, comprising:
the open circuit detection digital circuit records the open circuit LED position and shields PWM display output at the corresponding position;
the OPEN circuit detection analog circuit is used for judging the OPEN circuit state of the LED lamp and generating/clearing an OPEN circuit signal OPEN;
the open circuit detection digital circuit includes: an enable processing circuit for processing an open detection enable;
the OPEN-circuit signal synchronization circuit is used for synchronously inputting an OPEN signal;
the open-circuit position recording circuit is used for recording the position of the open-circuit LED lamp;
the shielding open-circuit output circuit is used for shielding the PWM output of the open-circuit LED;
the enabling processing circuit generates an open-circuit detection signal in the first sub-period of each row according to the input open-circuit detection enabling signal EN and PWM cycle counting signals CNT1 and CNT2 to carry out open-circuit detection; the OPEN circuit signal synchronization circuit carries out synchronization processing on an OPEN signal generated by the OPEN circuit detection analog circuit on the rising edge of a GCLK clock, and transmits the synchronized signal to the OPEN circuit position recording circuit; the open circuit position recording circuit defines 32 multiplied by 16 registers, traverses each channel row by row, sets the register of the corresponding open circuit position as 1, and keeps the rest of the registers as 0; the shielding open-circuit output circuit performs selection processing on the final PWM output end, and shields the position output if the position is open-circuit; otherwise, normally outputting the scattered gray data.
2. The LED driving chip open circuit detection circuit according to claim 1, wherein the open circuit detection analog circuit comprises:
the open circuit state detection circuit detects the state of the OUT end LED and judges whether the open circuit exists or not;
a PWM processing circuit for processing the digitally transferred PWN signal;
a ghost eliminating circuit for eliminating ghost image;
and an OPEN-circuit signal generating circuit for generating/clearing the OPEN-circuit detection signal OPEN.
3. The LED driver chip open circuit detection circuit as claimed in claim 2, wherein the open state detection circuit generates an open judgment signal OUT _ O =1 after the output terminal OUT =0 passes through the comparator, and transmits the open judgment signal OUT _ O =1 to the open signal generation circuit.
4. The open-circuit detection circuit of the LED driving chip according to claim 2, wherein the PWM processing circuit extends the PWM signal transmitted by the digital part to perform the first row dimming adjustment and the low gray-white balance adjustment.
5. The LED driver chip OPEN circuit detection circuit of claim 2, wherein the OPEN circuit signal generation circuit generates a high OPEN signal at a rising edge of the PWM according to OUT _ O outputted from the OPEN circuit state detection circuit, the OPEN signal following a PWM cycle, the OPEN signal remaining unchanged after the OPEN circuit detection is completed, and the OPEN signal no longer being detected at that position.
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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 |
| CN115249457B (en) * | 2022-01-21 | 2024-08-16 | 中科芯集成电路有限公司 | Driving method for displaying arbitrary groups of numbers 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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| CN106793363B (en) * | 2015-11-20 | 2019-04-16 | 华润矽威科技（上海）有限公司 | LED drive circuit and its open-circuit-protection method |
| CN105825806B (en) * | 2016-05-24 | 2018-08-07 | 北京集创北方科技股份有限公司 | LED display driving systems, control method and LED display |
| CN106558286B (en) * | 2017-02-14 | 2019-02-15 | 江苏利鼎微系统有限公司 | A kind of full-color LED display screen digital driving chip |
| CN107589568B (en) * | 2017-09-20 | 2020-05-22 | 武汉精测电子集团股份有限公司 | Automatic learning and detecting device and method for LED lamp string |
| CN208580563U (en) * | 2018-08-13 | 2019-03-05 | 深圳市奥拓电子股份有限公司 | LED drive chip and LED display |
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