WO2011015141A1 - 一种用于驱动led广告显示屏的集成电路 - Google Patents

一种用于驱动led广告显示屏的集成电路 Download PDF

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Publication number
WO2011015141A1
WO2011015141A1 PCT/CN2010/075700 CN2010075700W WO2011015141A1 WO 2011015141 A1 WO2011015141 A1 WO 2011015141A1 CN 2010075700 W CN2010075700 W CN 2010075700W WO 2011015141 A1 WO2011015141 A1 WO 2011015141A1
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Prior art keywords
circuit
driving
decoding
unit
display screen
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PCT/CN2010/075700
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English (en)
French (fr)
Inventor
张伟
门洪达
冯根强
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深圳市天微电子有限公司
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Priority claimed from CN2009101088682A external-priority patent/CN101707041B/zh
Application filed by 深圳市天微电子有限公司 filed Critical 深圳市天微电子有限公司
Priority to CN2010800285684A priority Critical patent/CN102405491A/zh
Publication of WO2011015141A1 publication Critical patent/WO2011015141A1/zh

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    • 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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0275—Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current

Definitions

  • the present invention relates to the field of LED drive control technology, and more particularly to an integrated circuit for driving an LED advertising display screen.
  • the existing LED advertising display circuit generally uses 74HC595 or MBI5026 to drive LED light-emitting diode arrays, and the above-mentioned LED light-emitting diode arrays adopt modules.
  • the control of the 74HC595 or MBI5026 in a single module is usually done by a drive control circuit composed of 74HC245, 74HC138 and P-MOSFET 4953.
  • FIG. 1 is the circuit diagram of the existing LED display driver circuit
  • 74HC245 buffers and amplifies the data of the machine
  • 74HC138 plays the role of decoding
  • P-MOSFET4953 controls the LED array to emit light
  • the existing LED display driver There are many circuit components, low integration, large power consumption, complicated wiring and high cost.
  • the technical problem to be solved by the present invention is to provide a LED advertising display screen for the above-mentioned existing LED display driving circuit components, low integration, large power consumption, complicated wiring, and high cost. Integrated circuit.
  • the technical solution adopted by the present invention to solve the technical problem is to construct an integrated circuit for driving an LED advertisement display screen, which comprises a data buffer unit and a decoding driving unit integrated in the same chip, and the data buffer unit includes multiple channels.
  • a buffer circuit the decoding driving unit comprises a multi-channel decoding circuit and a multi-channel P-MOSFET driving circuit; an output end of the multi-channel buffer circuit is connected to an input end of the multi-channel decoding circuit, and each channel is decoded
  • the output terminals of the circuit are respectively connected to the input terminals of a corresponding P-MOSFET driving circuit.
  • the integrated circuit for driving an LED advertising display screen of the present invention further includes a first protection unit integrated in the same chip, and the first protection unit is connected to the multiple decoding circuits.
  • the first protection unit uses a counter to count and detect signals on an input end of the multiple decoding circuit, and in any one of the decoding circuits When the signal on the input terminal is abnormal, the multi-channel decoding circuit is controlled to be reset.
  • the first protection unit is a watchdog circuit.
  • the integrated circuit for driving an LED advertising display screen of the present invention further includes a second protection unit integrated in the same chip, a second protection unit and a P-MOSFET tube in the multi-channel P-MOSFET driving circuit
  • the control terminals are connected to each other.
  • the integrated circuit for driving an LED advertising display screen according to the present invention further includes a data output unit connected to the output end of the data buffer unit and integrated in the same chip.
  • the multiple decoding circuit is one of a 2-4 decoding circuit, a 3-8 decoding circuit, and a 4-16 decoding circuit. Two or three combinations.
  • the buffer circuit is a single-input single-output buffer circuit.
  • the buffer circuit is a single input and multiple output buffer circuit.
  • the integrated circuit for driving the LED advertising display screen of the invention has the following beneficial effects: the data buffer unit and the decoding driving unit are integrated in the same chip, the integration degree is high, the power consumption is small, the cost is low, and the The integrated circuit of the invention can reduce the number of chips in each single module by more than half, and at the same time, the circuit interconnection between the chips is reduced due to the reduction of the chip, so that the processing cost is significantly reduced, and the LED advertising display is also reduced. Drive circuit failure rate and maintenance/repair costs.
  • the integrated circuit used to drive the LED advertising display also has a protection function.
  • 1 is a circuit diagram of a conventional LED display driving circuit
  • FIG. 2 is a block diagram showing the structure of a first embodiment of an integrated circuit for driving an LED advertising display screen of the present invention
  • FIG. 3 is a structural block diagram of a second embodiment of an integrated circuit for driving an LED advertising display screen of the present invention.
  • FIG. 4 is a structural block diagram of a third embodiment of an integrated circuit for driving an LED advertising display screen of the present invention.
  • Figure 5 is a block diagram showing the structure of a fourth embodiment of an integrated circuit for driving an LED advertising display screen of the present invention.
  • Figure 6 is a circuit diagram of a preferred embodiment of the data buffer unit of the present invention.
  • Figure 7 is a circuit diagram of a preferred embodiment of the decoding drive unit of the present invention.
  • Figure 8 is a circuit diagram of a preferred embodiment of the first protection unit of the present invention.
  • Figure 9 is a circuit diagram of a preferred embodiment of the second protection unit of the present invention.
  • the integrated circuit for driving the LED advertising display screen includes a data buffer unit 1 and a decoding driving unit 2 integrated in the same chip, the data buffer unit 1 includes a multiplex buffer circuit 11; and the decoding driving unit 2 includes multiplex decoding a circuit 21 and a plurality of P-MOSFET driving circuits 22; the output ends of the multiplex buffer circuits 11 are connected to the input ends of the multiplex decoding circuits 21, and the output terminals of each of the decoding circuits 21 are respectively connected to one channel The input terminals of the corresponding P-MOSFET drive circuits 22 are connected.
  • the data buffer unit 1 and the decoding driving unit 2 are integrated in the same chip, the integration degree is high, the power consumption is small, the cost is low, and each single mode is made by the integrated circuit of the invention.
  • the number of chips in the group is reduced by more than half, and the reduction of the chip reduces the interconnection of circuits between the chips, which significantly reduces the processing cost, and also reduces the failure rate and maintenance/maintenance costs.
  • the integrated circuit for driving the LED advertising display screen of the invention adopts a common packaging method of the semiconductor chip, such as a BGA ball grid array package, a PGA pin grid array package, a DIP dual in-line package, etc., and overcomes heat dissipation. problem.
  • FIG. 3 it is a structural block diagram of a second embodiment of an integrated circuit for driving an LED advertising display screen of the present invention.
  • the difference between the second embodiment and the first embodiment shown in FIG. 1 is that, based on the first embodiment, the first protection unit 3, the first protection unit 3 and the data buffer unit 1 and the decoding driver are added.
  • the units 2 are all integrated in the same chip, and the first protection unit 3 is connected to the multi-channel decoding circuit 21 in the decoding driving unit 2, and the signals on the input end of the multi-channel decoding circuit 21 are counted and detected.
  • the multiplex decoding circuit 21 is controlled to perform reset.
  • FIG. 4 it is a structural block diagram of a third embodiment of an integrated circuit for driving an LED advertising display screen of the present invention.
  • the difference between the third embodiment and the second embodiment shown in FIG. 2 is that, on the basis of the second embodiment, the second protection unit 4, the second protection unit 4 and the first protection unit 3, and the data are further added.
  • the buffer unit 1 and the decoding driving unit 2 are both integrated in the same chip, and the output protection unit 4 is connected to the control terminal of the P-MOSFET in the multi-channel P-MOSFET driving circuit 22, and the P-MOSFET operates in a working state. In the event of an abnormality, the switch turns off the P-MOSFET, turning off the LED load for protection.
  • FIG. 5 it is a structural block diagram of a fourth embodiment of an integrated circuit for driving an LED advertising display screen of the present invention.
  • the fourth embodiment differs from the third embodiment shown in FIG. 4 in that, on the basis of the third embodiment, a data output unit 5 is further added, and the data output unit 5 is connected to the output end of the data buffer unit 1. And integrated in the same chip.
  • the data output unit 5 outputs data buffer-amplified by the data buffer unit 1 as post-stage data for use in the next-stage circuit, even for cascading of the chip or the like.
  • the data buffer unit 1 is used for buffer amplification of input data to output data, and is used for cascading of the chip, wherein the circuits I51, I53, I52, I96, I95, I50 constitute one of the single-input and single-out buffer circuits for The input data of this stage and the buffer of the output data of this stage, the circuits I63, I62, I98 constitute one of the single-input and multi-out buffer circuits (the multi-channel single-input and multi-out buffer circuit is composed of multiple one-way single-input and multi-out buffer circuits), The data input by the stage is buffered and sent to the decoding driving unit 2.
  • the data buffer unit 1 also performs filtering and/or shaping processing on the input data.
  • the decoding driving unit 2 is configured to complete 1/4 duty decoding of the LED scanning signal to drive the corresponding PMOS circuit.
  • I7, I16, I32, and I33 constitute one of the PMOS driving circuits 22 (the multiple PMOS driving circuit is composed of a plurality of PMOS driving circuits).
  • the specific implementation process is as follows:
  • the decoding drive unit When the WDH signal is 0 (non-enabled state), the decoding drive unit operates.
  • the I10, I23, I101, and I103 drive the P-MOSFE tube Y3.
  • the 2-4 way decoding circuit and the P-MOSFET driving circuit are shown in the specific embodiment, and other 3-8 way decoding circuits and 4-16 way decoding circuits have the same principle, which can be based on actual needs. Make a choice.
  • the above WDH signal is generated by a watchdog circuit, where the first protection unit 3 is a watchdog circuit and the WDH signal is used for LED drive protection.
  • FIG. 8 it is a circuit diagram of a preferred embodiment of the first protection unit in the present invention.
  • the data input and output terminals of the first protection unit 3 are connected to the decoding drive unit 2, specifically, to the multiplex decoding circuit 21.
  • the first protection unit 3 is added in this embodiment.
  • the first protection unit sends a control signal to the decoding drive unit 2 to turn off all P-MOSFEs.
  • the dot matrix of the LED display since it is a time-sharing scanning display, when the input scanning waveform does not change, a certain line is fixedly lit. LED lamps that flow through peak currents for long periods of time can be damaged or seriously affect their life and must be protected.
  • the protection signal WDH is pulled high after a certain time, the P-MOSFET is turned off, if the signal changes within a limited time, WDH is cleared, the count is restarted; the circuit I248 oscillator generates a count The required CP clock signal; circuits I176, I178, I177, I253 are edge pulse production circuits for detecting changes in the AI signal, and when the AI signal changes to generate a low level pulse to reset the counter; circuits I199, I197, I179, I182, I183, I184, I185, I189 constitute a counter for counting the time when the AI signal does not change. When the counting time is up, WDH jumps high.
  • FIG. 9 it is a circuit diagram of a preferred embodiment of the second protection unit in the present invention.
  • a second protection unit is added, and the second protection unit is integrated in the same chip as the first protection unit,
  • the second protection unit 4 is connected to the control terminal of the P-MOSFET tube in the multi-channel P-MOSFET driving circuit 22, and detects the level of the P-MOSFET output driving pin in real time, and finds any two-way P-MOSFET driving. When the pin level is high at the same time, turn off the P-MOSFET.
  • P0 ⁇ P7 is the P-MOSFET drive pin signal
  • FAILH is the protection output signal
  • FAILH is connected to the control end of the P-MOSFET, and directly turns off the output of the P-MOSFET.
  • the components labeled I236, I237, I238, I239, I240, I241, I242, and I243 are characterized by an input flip voltage of VDD-2V for identifying the output level of the P-MOSFET, and determining the Whether the P-MOSFET is turned on.
  • the combination logic circuit parts (I244 ⁇ I251, I272 ⁇ I279, I255 ⁇ I271, I252) realize that when the output level of any two or more P-MOSFETs is high, it is judged that the output pin is short-circuited, and FAILH outputs high. Level signal to disconnect the P-MOSFET tube for the purpose of protecting the chip.
  • the embodiments of the first protection unit 3 and the second protection unit 4 of the present invention are not limited to the above embodiments, and various methods may be employed. However, if the protection principle is adopted, it will be within the scope of protection of the present invention. .
  • the data buffer unit 1, the decoding driving unit 2, the first protection unit 3, and the second protection unit 4 Integrated with the data buffer unit 5 in the same chip, high integration, low power consumption, low cost, and the number of chips in each single module can be reduced by more than half, and the chip is reduced due to the reduction of chips.
  • the interconnection of the wires is reduced, the processing cost is significantly reduced, and the protection function is provided, and the failure rate and maintenance/maintenance cost of the driving circuit of the LED advertising display are also reduced.

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Description

一种用于驱动LED广告显示屏的集成电路 技术领域
本发明涉及LED驱动控制技术领域，更具体地说，涉及一种用于驱动LED广告显示屏的集成电路。
背景技术
目前，LED广告显示屏已广泛地运用于人们的生活中，现有的LED广告显示屏的驱动电路普遍使用74HC595或MBI5026来驱动LED发光二极管阵列，而上述LED发光二极管阵列均采用模组的方式，在单一模组内的74HC595或MBI5026的控制，通常采用74HC245、74HC138和P-MOSFET4953共同组成的驱动控制电路来完成。如图1所示，是现有的LED显示驱动电路的电路图，74HC245对本机数据进行缓冲和放大，74HC138起译码作用，P-MOSFET4953控制LED发光二极管阵列发光，但是，现有的LED显示驱动电路元件较多，集成度低，功耗较大，布线复杂，成本偏高。
发明内容
本发明要解决的技术问题在于，针对上述现有的LED显示驱动电路元件较多、集成度低、功耗较大、布线复杂、成本偏高的缺陷，提供一种用于驱动LED广告显示屏的集成电路。
本发明解决其技术问题所采用的技术方案是：构造一种用于驱动LED广告显示屏的集成电路，其包括集成在同一芯片中的数据缓冲单元和译码驱动单元，数据缓冲单元包括多路缓冲电路；译码驱动单元包括多路译码电路和多路P-MOSFET驱动电路；所述多路缓冲电路的输出端与所述多路译码电路的输入端均相连接，每一路译码电路的输出端分别与一路对应的P-MOSFET驱动电路的输入端相连接。
本发明所述的用于驱动LED广告显示屏的集成电路中，还包括集成在同一芯片中的第一保护单元，第一保护单元与所述多路译码电路均相连接。
本发明所述的用于驱动LED广告显示屏的集成电路中，所述第一保护单元采用计数器对所述多路译码电路的输入端上的信号进行计数检测，在任意一路译码电路的输入端上的信号异常时，控制所述多路译码电路进行复位。
本发明所述的用于驱动LED广告显示屏的集成电路中，所述第一保护单元为看门狗电路。
本发明所述的用于驱动LED广告显示屏的集成电路中，还包括集成在同一芯片中的第二保护单元，第二保护单元与所述多路P-MOSFET驱动电路中P-MOSFET管的控制端均相连接。
本发明所述的用于驱动LED广告显示屏的集成电路中，还包括与所述数据缓冲单元的输出端相连接且集成在同一芯片中的数据输出单元。
本发明所述的用于驱动LED广告显示屏的集成电路中，所述多路译码电路为2-4译码电路、3-8译码电路、4-16译码电路其中的一种、二种或三种的组合。
本发明所述的用于驱动LED广告显示屏的集成电路中，所述缓冲电路为单进单出缓冲电路。
本发明所述的用于驱动LED广告显示屏的集成电路中，所述缓冲电路为单进多出缓冲电路。
实施本发明的用于驱动LED广告显示屏的集成电路，具有以下有益效果：数据缓冲单元和译码驱动单元集成在同一芯片中，集成度高，功耗较小、成本较低，且通过本发明的集成电路，使得每个单一模组内的芯片个数可降低一半以上，同时由于芯片的减少使芯片间的线路互连减少，使加工成本明显降低，另外也降低了LED广告显示屏的驱动电路的故障率和维护/维修成本。
另外，本用于驱动LED广告显示屏的集成电路还具有保护功能。
附图说明
下面将结合附图及实施例对本发明作进一步说明，附图中：
图1是现有的LED显示驱动电路的电路图；
图2是本发明用于驱动LED广告显示屏的集成电路的第一实施例的结构框图；
图3是本发明用于驱动LED广告显示屏的集成电路的第二实施例的结构框图；
图4是本发明用于驱动LED广告显示屏的集成电路的第三实施例的结构框图；
图5是本发明用于驱动LED广告显示屏的集成电路的第四实施例的结构框图；
图6是本发明中数据缓冲单元的一优选实施例的电路图；
图7是本发明中译码驱动单元的一优选实施例的电路图；
图8是本发明中第一保护单元的一优选实施例的电路图；
图9是本发明中第二保护单元的一优选实施例的电路图。
具体实施方式
如图2所示，是本发明用于驱动LED广告显示屏的集成电路的第一实施例的结构框图。本用于驱动LED广告显示屏的集成电路包括集成在同一芯片中的数据缓冲单元1和译码驱动单元2，数据缓冲单元1包括多路缓冲电路11；译码驱动单元2包括多路译码电路21和多路P-MOSFET驱动电路22；所述多路缓冲电路11的输出端均与所述多路译码电路21的输入端相连接，每一路译码电路21的输出端分别与一路对应的P-MOSFET驱动电路22的输入端相连接。
在本具体实施时，将数据缓冲单元1和译码驱动单元2集成在同一个芯片中，集成度高，功耗较小、成本较低，且通过本发明的集成电路，使得每个单一模组内的芯片个数降低一半以上，同时由于芯片的减少使芯片间的线路互连减少，使加工成本明显降低，另外也降低了故障率和维护/维修成本。
本发明的用于驱动LED广告显示屏的集成电路采用半导体芯片常用的封装方式，如BGA球栅阵列封装，PGA插针网格阵列封装，DIP双列直插式封装等等，同时克服了散热问题。
如图3所示，是本发明用于驱动LED广告显示屏的集成电路的第二实施例的结构框图。本第二实施例与图1所示的第一实施例的区别在于：在第一实施例的基础上，增加了第一保护单元3，第一保护单元3与数据缓冲单元1和译码驱动单元2都集成在同一芯片中，第一保护单元3与译码驱动单元2中的多路译码电路21均相连接，对多路译码电路21的输入端上的信号进行计数检测，在任意一路译码电路21的输入端上的信号异常时，控制所述多路译码电路21进行复位。
如图4所示，是本发明用于驱动LED广告显示屏的集成电路的第三实施例的结构框图。本第三实施例与图2所示的第二实施例的区别在于：在第二实施例的基础上，还增加了第二保护单元4，第二保护单元4与第一保护单元3、数据缓冲单元1和译码驱动单元2都集成在同一芯片中，输出保护单元4与所述多路P-MOSFET驱动电路22中P-MOSFET的控制端均相连接，在P-MOSFET的工作状态发生异常时，开关关断P-MOSFET，从而关断LED负载以进行保护。
如图5所示，是本发明用于驱动LED广告显示屏的集成电路的第四实施例的结构框图。本第四实施例与图4所示的第三实施例的区别在于：在第三实施例的基础上，还增加了数据输出单元5，数据输出单元5与数据缓冲单元1的输出端相连接且集成在同一芯片中。数据输出单元5对经数据缓冲单元1缓冲放大的数据进行输出，作为后级数据，以用于下一级电路，甚至用于本芯片的级联等。
如图6所示，是本发明中数据缓冲单元的一优选实施例的电路图。数据缓冲单元1用于完成输入数据到输出数据的缓冲放大，并用于该芯片的级联，其中，电路I51、I53、I52、I96、I95、I50构成其中一路单进单出缓冲电路，用于本级输入数据和本级输出数据的缓冲，电路I63、I62、I98构成其中一路单进多出缓冲电路（多路单进多出缓冲电路由多个一路单进多出缓冲电路组成），用于将本级输入的数据经过缓冲后发送给译码驱动单元2。
进一步地，数据缓冲单元1对输入数据还进行滤波和/或整形处理。
如图7所示，是本发明中译码驱动单元的一优选实施例的电路图。译码驱动单元2用于完成LED扫描信号的1/4占空比译码，来驱动相应的PMOS电路， 其中，I7、I16、I32、I33构成其中一路PMOS驱动电路22（多路PMOS驱动电路由多个一路PMOS驱动电路组成）。具体实施过程如下所述：
（1）当WDH信号为0（非使能状况），本译码驱动单元工作。
在AI、BI信号为00时且，驱动相应的P-MOSFE管Y0，以点亮该行LED；
在AI、BI信号在01时，I8、I18、I37、I36驱动P-MOSFE管Y1；
在AI、BI信号在10时，I9、I21、I100、I102驱动P-MOSFE管Y2；
在AI、BI信号在11时，I10、I23、I101、I103驱动P-MOSFE管Y3。
（2）当WDH信号为1（使能状况），本译码驱动单元不工作。
本具体实施方式中所示出的是2-4路译码电路与P-MOSFET驱动电路，其它如3-8路译码电路、4-16路译码电路具有相同的原理，可依据实际需求进行选择。
上述WDH信号由看门狗电路产生，此处第一保护单元3为看门狗电路，WDH信号用于LED驱动保护。
另外，对LED扫描的1/2、1/4、1/8、1/16的占空比形式，实现原理与本实施例相同，此处不再赘述。
如图8所示，是本发明中第一保护单元的一优选实施例的电路图。第一保护单元3的数据输入输出端与译码驱动单元2相连接，具体地，与多路译码电路21均相连接。
为防止在扫描信号缺失时，相应LED的工作电流过大，引起LED损坏，本具体实施方式增加了第一保护单元3。
具体实施过程如下所述：
当AI、BI扫描信号长期不变化时，第一保护单元会送出控制信号给译码驱动单元2，关闭所有P-MOSFE。在LED显示屏的点阵中，由于是分时扫描显示，当输入的扫描波形不变化时，会造成某行固定点亮。LED灯长时间的流过峰值电流，会被损坏或严重影响寿命，因此必须进行保护。
当扫描信号AI长时间不变化时，保护信号WDH经过若干时间后拉高，关掉P-MOSFET，如果该信号在限定时间内变化，WDH被清零，计数重新开始；电路I248振荡器产生计数所需CP时钟信号；电路I176、I178、I177、I253是边沿脉冲生产电路，用于检测AI信号的变化，当AI信号变化是产生低电平脉冲，来复位计数器；电路I199、I197、I179、I182、I183、I184、I185、I189构成计数器，用来对AI信号不变化的时间计数，当计数时间到时，WDH跳高。
如图9所示，是本发明中第二保护单元的一优选实施例的电路图。
在实际的生产加工中，为了防止多个P-MOSFET管输出驱动管脚之间发生短路，增加了第二保护单元，第二保护单元与第一保护单元一样，也集成在同一芯片中，第二保护单元4与所述多路P-MOSFET驱动电路22中P-MOSFET管的控制端均相连接，实时检测P-MOSFET输出驱动管脚的电平，当发现任两路的P-MOSFET驱动管脚电平同时为高时，关掉P-MOSFET。其中，P0～P7是P-MOSFET驱动管脚信号，FAILH是保护输出信号，FAILH接至P-MOSFET管的控制端，直接关断P-MOSFET管的输出。
在此电路中，元件标号为I236、I237、I238、I239、I240、I241、I242、I243反相器特征为：输入翻转电压为VDD-2V，用于鉴别P-MOSFET的输出电平，判断该P-MOSFET管是否导通。组合逻辑电路部分（I244～I251、I272～I279、I255～I271、I252）实现当任何两个以上的P-MOSFET管的输出电平为高电平时，判断输出引脚短路，FAILH随之输出高电平信号，来断开P-MOSFET管，达到保护芯片的目的。
本发明的第一保护单元3和第二保护单元4的实施方式不止局限于上述实施例中所述，还可采用多种方式，但若采用该保护原理，将在本发明保护的范围之内。
综上所述，本发明用于驱动LED广告显示屏的集成电路中，数据缓冲单元1、译码驱动单元2、第一保护单元3、第二保护单元4 和数据缓冲单元5集成在同一芯片中，集成度高，功耗较小、成本较低，且使得每个单一模组内的芯片个数可降低一半以上，同时由于芯片的减少使芯片间的线路互连减少，使加工成本明显降低，且具有保护功能，另外也降低了LED广告显示屏的驱动电路的故障率和维护/维修成本。
以上所述仅为本发明的实施例，并不用以限制本发明，凡在本发明的精神和原则内所作的任何修改、等同替换或改进等，均应包含在本发明的保护范围内。

Claims (9)

  1. 一种用于驱动LED广告显示屏的集成电路，其特征在于，包括集成在同一芯片中的数据缓冲单元(1)和译码驱动单元(2)，
    数据缓冲单元(1)包括多路缓冲电路（11）；
    译码驱动单元(2)包括多路译码电路（21）和多路P-MOSFET驱动电路（22）；
    所述多路缓冲电路（11）的输出端与所述多路译码电路（21）的输入端均相连接，每一路译码电路（21）的输出端分别与一路对应的P-MOSFET驱动电路（22）的输入端相连接。
  2. 根据权利要求1所述的用于驱动LED广告显示屏的集成电路，其特征在于，还包括集成在同一芯片中的第一保护单元(3)，第一保护单元(3)与所述多路译码电路（21）均相连接。
  3. 根据权利要求2所述的用于驱动LED广告显示屏的集成电路，其特征在于，所述第一保护单元(3)采用计数器对所述多路译码电路（21）的输入端上的信号进行计数检测，在任意一路译码电路（21）的输入端上的信号异常时，控制所述多路译码电路（21）进行复位。
  4. 根据权利要求3所述的用于驱动LED广告显示屏的集成电路，其特征在于，所述第一保护单元(3)为看门狗电路。
  5. 根据权利要求1至4中任意一项所述的用于驱动LED广告显示屏的集成电路，其特征在于，还包括集成在同一芯片中的第二保护单元(4)，第二保护单元(4)与所述多路P-MOSFET驱动电路（22）中P-MOSFET管的控制端均相连接。
  6. 根据权利要求1至4中任意一项所述的用于驱动LED广告显示屏的集成电路，其特征在于，还包括与所述数据缓冲单元(1)的输出端相连接且集成在同一芯片中的数据输出单元。
  7. 根据权利要求1所述的用于驱动LED广告显示屏的集成电路，其特征在于，所述多路译码电路（21）为2-4译码电路、3-8译码电路、4-16译码电路其中的一种、二种或三种的组合。
  8. 根据权利要求1所述的用于驱动LED广告显示屏的集成电路，其特征在于，所述缓冲电路（11）为单进单出缓冲电路。
  9. 根据权利要求1所述的用于驱动LED广告显示屏的集成电路，其特征在于，所述缓冲电路（11）为单进多出缓冲电路。
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