Single-line LED data transmission display method and driving chip
A technology of LED chip and data transmission, applied in electrical components and other directions, can solve the problems of signal distortion, shaping error, signal judgment error, etc., achieve good compatibility, reduce bit error rate, and solve the effect of glitch interference
Active Publication Date: 2020-04-10
PURESEMI CO LTD
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Problems solved by technology
[0007] For circuits existing in the prior art, when the transmission data is far away or the number of cascades is large, it is easy to cause signal distortion. In the prior art pulse shaping scheme, the cycle of the clock signal is too large to easily cause shaping errors. When the transmission distance becomes larger, it may Wider burrs cause signal judgment errors. The invention provides a single-line LED data transmission display method and a driver chip. In multi-level cascaded LED constant current chips, in addition to realizing large data transmission distances and large series series It can also independently adjust the current of each lamp bead, configure register data and check code data, display data and check, adjust the overall display effect, etc., which improves the flexibility, anti-interference and accuracy of the system
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[0035] In this embodiment, the LED driver chips are connected in cascade, and the schematic diagram is as follows: image 3 As shown, the input data sent by the sending card is connected to the input terminal din of the first chip chip1, the output terminal dout of the first chip chip1 is connected to the input terminal din of the second chip chip2, and the output terminal dout of the second chip chip2 is connected to The input terminal din of the third chip chip3, and then the input terminal din of each chip is connected to the output terminal dout of the previous chip, and each LED driver chip transmits data through this cascade connection.
[0036] Such as figure 2 As shown, the data processing module of the driver chip includes a data identification module, a data storage module, a data shaping transmission module and a data display module; the data sent to the LED driver chip is processed by the data processing module in the chip, and the data is sequentially passed thro...
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The invention discloses a single-line LED data transmission display method and a driving chip, and belongs to the field of LED driving circuits. In the prior art, when a circuit transmits far data orhas a large number of cascading numbers, it is easy to case signal distortion or shaping errors. According to the single-line LED data transmission display method and the driving chip, the format of the transmitted data is adjusted to display data and current data of each lamp bead for respective transmission, and independent adjustment of the current of the lamp beads is realized; a shaping mechanism in the data processing module avoids the interference caused by burrs, and can also distinguish when the effective levels of the 0 code and the 1 code are close to each other; the transmission requirements of the large data transmission distance and multiple series levels are realized, the current of each lamp bead can be independently adjusted, the register data and check code data are configured, the data are displayed and checked, the overall display effect is adjusted and the like, and the flexibility, anti-interference performance and accuracy of the system are improved.
Description
technical field [0001] The invention relates to the field of LED drive circuits, and more specifically, to a single-line LED data transmission and display method and a drive chip. Background technique [0002] In the single-line high-speed data transmission method of LED driver integrated circuit display data, the DMX-512 communication protocol or similar transmission methods are mainly used. This is a single-line data transmission method, that is, the output from the upper level to the lower level The direct drive mode of the primary input is used for cascade transmission. Now more and more outdoor large screens are used, so in future applications, it will be more and more emphasized that the transmission distance between adjacent LEDs should be longer, and a longer transmission distance will cause a larger signal distortion. , so it also poses a huge challenge to the accuracy of data transmission. [0003] In the actual application process, due to the inconsistency in th...
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Login to View More IPC IPC(8): H05B45/345H05B45/20H05B45/10
Inventor 张若平宋霄陈君杰陈寒韦正兴冷佳伟蒋召宇何书专
Owner PURESEMI CO LTD