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LED (Light-Emitting Diode) array scanning chip, LED device and LED scanning circuit
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A technology of LED array and scanning chip, which is applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., and can solve the problems of poor versatility
Active Publication Date: 2014-05-07
SHENZHEN CYT SEMICON TECH CO LTD
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[0003] The purpose of the embodiment of the present invention is to provide an LED array scanning chip, which aims to solve the problem that the LED matrix scanning circuit needs to design additional external resistors to provide scanning current, and also needs complicated software to control the peripheral, and the problem of poor versatility
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Embodiment 1
[0027] figure 1 A structural diagram of the LED array scanning chip provided by Embodiment 1 of the present invention is shown, and for convenience of description, only parts related to the embodiment of the present invention are shown.
[0028] The LED array scanning chip can be used in LED scanning circuits or LED devices, for example, LED dot matrix, LED screen display and the like.
[0029] In the embodiment of the present invention, the LED array scanning chip includes a storage unit 11 to store the scanning current value and the scanning state value.
[0030] In the embodiment of the present invention, the storage unit 11 may be FLASH, EPROM or EEPROM or the like.
[0031] In the embodiment of the present invention, the scanning current value and scanning state value stored in the storage unit 11 can also be written by the chip manufacturer before leaving the factory, and the default power-on current value can be set according to the actual situation, such as 13mA. The...
Embodiment 2
[0041] figure 2 A schematic diagram of the LED array scanning chip package provided by Embodiment 2 of the present invention is shown.
[0042] In the embodiment of the present invention, after the scanning chip in the first embodiment is packaged, it may include n scanning line pins S1...Sn, m constant current output driving pins OUT1...OUTm, Data input pin, data output pin, digital power supply pin VDD, analog power supply pin VCC, internal filter pin Cnp, digital ground pin GND, and analog ground pin Vss, where n and m are greater than 1 of natural numbers.
Embodiment 3
[0044] image 3 A schematic diagram of the LED array scanning chip package provided by Embodiment 3 of the present invention is shown.
[0045] In the embodiment of the present invention, when the scanning mode of the scanning chip in the second embodiment is 1 / 4 scanning, the scanning line pins are 4, including S1, S2, S3 and S4, and the constant current output driving pins are 12, Including OUT0, OUT2...OUT11, at this time, the schematic diagram of the LED array scanning chip package, please refer to image 3 .
[0046] In the embodiment of the present invention, the scanning chip is designed with a built-in 300Hz port refresh rate, which can effectively reduce the data transmission rate. After selection, the refresh rate can be fixed. In order to keep the IC process stable, it can be maintained within a small range. , which is not intended to limit the present invention.
[0047] In the embodiment of the present invention, the storage unit 11 can set 4 times the current ...
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Abstract
The invention is suitable to the technical field of LEDs (Light-Emitting Diodes), and provides an LED array scanning chip, an LED device and an LED scanning circuit. The scanning chip comprises a storing unit, a scanning driving unit, a constant-current output driving unit and a serial shift driving unit, wherein the storing unit is used for storing scanning current values and scanning state values; the scanning driving unit is connected with the storing unit and is used for controlling the working state of LEDs in an LED array according to the scanning state values read from the storing unit; the constant-current output driving unit is respectively connected with the storing unit and the scanning driving unit and is used for outputting the scanning current values read from the storing unit and received gray-scale data to the LED array; and the serial shift driving unit is respectively connected with the storing unit and the constant-current output driving unit and is used for transmitting the received and externally inputted gray-scale data to a local-level constant-current output driving unit and writing the scanning current values into the storing unit. The invention provides the scanning chip which is free from an external resistor for current setting and compiling control software, and the scanning chip has universality.
Description
technical field [0001] The invention belongs to the technical field of LEDs, and in particular relates to an LED array scanning chip, LED equipment and an LED scanning circuit. Background technique [0002] Light-emitting diode (Lighting Emitting Diode, LED) is a solid-state semiconductor device that can convert electrical energy into light. Good collision mechanical properties, small size and other characteristics different from traditional optoelectronic new products are widely used in automobiles, new communication products, new information products, new consumer products, etc. However, under the background of the rapid development of LED, it has always been a negative LED matrix scanning is obtained by single-chip scanning, which requires professional technicians to design external resistors to provide scanning current, and also requires complex software to control the periphery, which is not universal. Contents of the invention [0003] The purpose of the embodiments...
Claims
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Application Information
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