A control circuit for a self-checking light-emitting diode device

Abstract

This invention discloses a control circuit for a self-checking light-emitting diode (LED) device, comprising a controller and an LED module. The LED device includes multiple LED units, each of which has an input terminal connected to the controller via a parallel line. Each LED unit receives a first preset check code and compares this first preset check code with a first local calculation check code obtained from the input light emission data to determine if one or more preliminary errors exist. If a preliminary error exists, the corresponding LED unit does not emit light.

Claims

1. A control circuit for a self-checking light-emitting diode (LED) device, comprising: a controller; and a string of LEDs, including a plurality of LED units, wherein an input terminal of each LED unit is connected to the controller via a parallel line; wherein, The control circuit is configured to perform the following operations: Operation 1-1: The controller sends an output light emission data to each of the light-emitting diode units; Operation 1-2: The light-emitting diode unit receives an input light emission data and stores the input light emission data; Operation 1-3: The controller sends an error checking command to each of the light-emitting diode units; Operation 1-4: The controller sends a first preset check code to each of the light-emitting diode units, wherein the first preset check code is associated with the output light emission data; Operation 1-5: The light-emitting diode unit receives the first preset check code, compares the first preset check code with a first local calculation check code obtained based on the input light emission data, and determines whether there is one or more preliminary errors; and Operation 1-6: If there is a preliminary error, the corresponding light-emitting diode unit does not emit light.

2. The control circuit as described in claim 1, wherein in operations 1-6, if the first preset check code matches the first local operation check code, then there is no preliminary error, and the corresponding light-emitting diode unit emits light according to the input light-emitting data.

3. The control circuit as described in claim 1, wherein in operations 1-6, if the first preset check code does not conform to the first local operation check code, there is a preliminary error, and the corresponding light-emitting diode unit sends back a preliminary error indication signal to the controller.

4. The control circuit as described in claim 3, wherein the first local operation check code is a cyclic redundancy check code.

5. The control circuit as claimed in claim 1, wherein after operations 1-6, the following operations are further included: Operation 1-7: The controller sends a first output verification data to the LED unit with the initial error; Operation 1-8: The LED unit receives and stores a first input verification data; Operation 1-9: The controller then sends a second preset check code to the LED unit with the initial error, wherein, The second preset check code is associated with the first output verification data; and operation 1-10: the light-emitting diode unit receives the second preset check code, compares the second preset check code with a second local operation check code obtained from the first input verification data, and if they do not match, it is determined that there is a first verification error.

6. The control circuit as described in claim 5, wherein after operations 1-10, it further includes the following operations: Operation 1-11: The controller sends a second output verification data to the LED unit with the initial error; Operation 1-12: The LED unit receives and stores a second input verification data; Operation 1-13: The controller sends a third preset check code to the LED unit with the initial error, wherein, The third preset check code is associated with the second output verification data, and the third preset check code is different from the second preset check code; and operation 1-14: the light-emitting diode unit receives the third preset check code, compares the third preset check code with a third local operation check code obtained according to the second input verification data, and if they match, it is determined that there is a second verification error.

7. The control circuit as described in either claim 5 or 6, wherein the second local operation check code is a cyclic redundancy check code.

8. The control circuit as claimed in claim 5, wherein after operations 1-10, if the first verification error occurs, the corresponding light-emitting diode unit sends back a verification error indication signal to the controller.

9. The control circuit as claimed in claim 6, wherein after operations 1-14, if the second verification error occurs, the corresponding light-emitting diode unit sends back a verification error indication signal to the controller.

10. The control circuit as described in claim 6, wherein the third local operation check code is a cyclic redundancy check code.

Images