Light emitting device

Abstract

A light emitting device is provided. The light emitting device includes a control circuit and a light emitting element string. The control circuit outputs a driving power. The light emitting element string includes light emitting elements, a power line, a first receiving port and a second receiving port. The power line is connected to the light emitting elements. A first terminal of the power line is connected to the first-stage light-emitting element. The second terminal of the power line is connected to the last-stage light-emitting element. The first receiving port provides the driving power to the first terminal of the power line. The second receiving port provides the driving power to the second terminal of the power line.

Description

[Technical Field]

[0001] The present invention relates to an electronic device, and more particularly to a light-emitting device. [Previous Technology]

[0002] The light-emitting device may include a string of light-emitting elements. The string of light-emitting elements includes a power line. Multiple light-emitting elements in the string can be driven by a driving power source transmitted via the power line. Generally, a single receiving end of the power line receives the driving power. It should be noted that if the string of light-emitting elements is a light bar or tube consisting of dozens or hundreds of light-emitting elements, the path length of the power line will be very long. The voltage value at the end of the power line will be significantly lower than the voltage value at the receiving end of the power line. The low voltage value at the end of the power line prevents the light-emitting elements at the end of the string from accurately performing the intended light-emitting effect. Therefore, the operation of the string of light-emitting elements may malfunction.

[0003] It can be seen that how to provide a method that makes the voltage value at the end of the power line of the light-emitting element string similar to the voltage value at the receiving end of the power line is one of the research focuses of those skilled in the art. [Summary of the Invention]

[0004] The present invention provides a light-emitting device that enables the voltage values ​​at both ends of the power line of the light-emitting element string to be consistent.

[0005] In one embodiment of the present invention, the light-emitting device includes a control circuit and a string of light-emitting elements. The control circuit outputs a driving power supply. The string of light-emitting elements includes a plurality of light-emitting elements, a power line, a first receiving port, and a second receiving port. The plurality of light-emitting elements includes a first-stage light-emitting element located at a first end of the string and a last-stage light-emitting element located at a second end of the string. The power line is connected to the plurality of light-emitting elements. The first end of the power line is connected to the first-stage light-emitting element. The second end of the power line is connected to the last-stage light-emitting element. The first receiving port is connected to the control circuit, the first-stage light-emitting element, and the first end of the power line. The first receiving port provides driving power to the first end of the power line. The second receiving port is connected to the control circuit, the last-stage light-emitting element, and the second end of the power line. The second receiving port provides driving power to the second end of the power line.

[0006] Based on the above, the first receiving port provides driving power to the first end of the power line. The second receiving port provides driving power to the second end of the power line. That is, both ends of the power line in the light-emitting element string receive the same driving power. Therefore, the voltage values ​​at both ends of the power line in the light-emitting element string are consistent. In this way, the last stage of light-emitting elements can accurately perform the expected light-emitting effect.

Implementation Method

[0007] Some embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Component symbols used in the following description are considered to be the same or similar components when they appear in different drawings. These embodiments are only a part of the present invention and do not disclose all possible implementations of the invention. More precisely, these embodiments are merely examples within the scope of the present invention's patent application.

[0008] Please refer to FIG1, which is a schematic diagram of a light-emitting device according to an embodiment of the present invention. In this embodiment, the light-emitting device 100 includes a control circuit 110 and a string of light-emitting elements 120. The control circuit 110 outputs a driving power supply PDR. The string of light-emitting elements 120 includes light-emitting elements LD1~LDn, a power line 121, and receiving ports 122_1 and 122_2. The light-emitting elements LD1~LDn are arranged sequentially between receiving ports 122_1 and 122_2. Therefore, the string of light-emitting elements 120 can be, for example, a light strip or a lamp tube. Among the light-emitting elements LD1~LDn, light-emitting element LD1 is the first-level light-emitting element located at the first end of the string of light-emitting elements 120. Light-emitting element LDn is the last-level light-emitting element located at the second end of the string of light-emitting elements 120.

[0009] In this embodiment, the power supply line 121 is connected to the light-emitting elements LD1~LDn. The first end of the power supply line 121 is connected to the light-emitting element LD1 (i.e., the first-stage light-emitting element). The second end of the power supply line 121 is connected to the light-emitting element LDn (i.e., the last-stage light-emitting element).

[0010] In this embodiment, receiving port 122_1 is connected to the first end of the control circuit 110, the light-emitting element LD1, and the power line 121. Receiving port 122_1 provides the driving power PDR to the first end of the power line 121. Receiving port 122_2 is connected to the second end of the control circuit 110, the light-emitting element LD1, and the power line 121. Receiving port 122_2 provides the driving power PDR to the second end of the power line 121.

[0011] It is worth mentioning that receiving port 122_1 provides the driving power supply PDR to the first end of power line 121. Receiving port 122_2 provides the driving power supply PDR to the second end of power line 121. That is, both ends of power line 121 receive the same driving power supply PDR. Therefore, the voltage values ​​at both ends of power line 121 are approximately the same. The voltage value of the driving power supply PDR received by the light-emitting elements away from the first end of power line 121 does not decrease significantly. In this way, light-emitting elements LD1~LDn can accurately perform the expected light-emitting effect based on the same voltage value of the driving power supply PDR.

[0012] In this embodiment, the light-emitting elements LD1~LDn can each be implemented using any type of light-emitting diode (LED) circuit. In this embodiment, the power line 121 can be a conductive structure for transmitting the driving power PDR. The power line 121 can be a power rail. In this embodiment, the receiving port 122_1 receives the driving power PDR via the power receiving terminal TPR1. The receiving port 122_2 receives the driving power PDR via the power receiving terminal TPR2.

[0013] Please refer to Figure 2, which is a schematic diagram of a light-emitting device according to an embodiment of the present invention. In this embodiment, the light-emitting device 200 includes a control circuit 210 and a string of light-emitting elements 220. The control circuit 210 outputs a driving power supply PDR. The string of light-emitting elements 220 includes light-emitting elements LD1~LDn, a power line 221, and receiving ports 222_1 and 222_2. The power line 221 is connected to the light-emitting elements LD1~LDn. The receiving port 222_1 includes a power receiving terminal TPR1 and a data receiving terminal TDR. The power receiving terminal TPR1 is connected to the first end of the power line 221. The power receiving terminal TPR1 receives the driving power supply PDR and transmits the driving power supply PDR to the first end of the power line 221. The data receiving terminal TDR is connected to the light-emitting element LD1 (i.e., the first-stage light-emitting element). The data receiving terminal TDR receives the data string SD and transmits the data string SD to the light-emitting element LD1.

[0014] In this embodiment, the data string SD is a sequence signal including data D1~Dn. The light-emitting elements LD1~LDn include a controller and light-emitting units. The controller of light-emitting element LD1 receives data D1 from the data string SD and transmits the data string SD to light-emitting element LD2 (i.e., the second-level light-emitting element). The controller of light-emitting element LD2 receives data D2 from the data string SD and transmits the data string SD to light-emitting element LD3 (i.e., the third-level light-emitting element), and so on. The controller of light-emitting element LD1 can control the light-emitting mode of the light-emitting unit of light-emitting element LD1 based on data D1. The controller of light-emitting element LD2 can control the light-emitting mode of the light-emitting unit of light-emitting element LD2 based on data D2, and so on.

[0015] In this embodiment, the receiving port 222_2 includes a power receiving terminal TPR2. The power receiving terminal TPR2 is connected to the second end of the power line 221. The power receiving terminal TPR2 receives the drive power supply PDR and transmits the drive power supply PDR to the second end of the power line 221.

[0016] In addition, receiving port 222_1 also includes a reference terminal TR1. Receiving port 222_2 also includes a reference terminal TR2. Reference terminals TR1 and TR2, together with the reference terminals of the light-emitting elements LD1~LDn, are connected to a reference low voltage (e.g., ground) in the control circuit 210.

[0017] In this embodiment, receiving ports 222_1 and 222_2 can be implemented by connectors well known to those skilled in the art.

[0018] Please refer to FIG3, which is a schematic diagram of a light-emitting device according to an embodiment of the present invention. In this embodiment, the control circuit 210 includes transmitting ports 211_1 and 211_2 and a driving circuit 212. Transmitting port 211_1 is operable to be connected to receiving port 222_1. Transmitting port 211_2 is operable to be connected to receiving port 222_2. The driving circuit 212 is connected to transmitting ports 211_1 and 211_2. The driving circuit 212 generates a driving power supply PDR and provides the driving power supply PDR to transmitting ports 211_1 and 211_2. The driving power supply PDR is provided to the first end of the power line 221 via transmitting port 211_1 and receiving port 222_1. In addition, the driving power supply PDR is also provided to the second end of the power line 221 via transmitting port 211_2 and receiving port 222_2.

[0019] The control circuit 210 also includes a data generator 213. The data generator 213 is connected to the transmitting port 211_1. The data generator 213 generates a data string SD and provides the data string SD to the transmitting port 211_1. The data string SD is provided to the light-emitting element LD1 via the transmitting port 211_1 and the receiving port 222_1.

[0020] In this embodiment, the transmitting port 211_1 includes a power transmitting end TPT1 and a data transmitting end TDT. The power transmitting end TPT1 is connected to the driving circuit 212. The data transmitting end TDT is connected to the data generator 213. When the transmitting port 211_1 is connected to the receiving port 222_1, the power transmitting end TPT1 is connected to the power receiving end TPR1. The data transmitting end TDT is connected to the data receiving end TDR. Therefore, the driving power PDR is provided to the first end of the power line 221 via the power transmitting end TPT1 and the power receiving end TPR1. The data string SD is provided to the light-emitting element LD1 via the data transmitting end TDT and the data receiving end TDR.

[0021] In this embodiment, the transmitting port 211_2 includes a power transmitting terminal TPT2. The power transmitting terminal TPT2 is connected to the driving circuit 212. When the transmitting port 211_2 is connected to the receiving port 222_2, the power transmitting terminal TPT2 is connected to the power receiving terminal TPR2. Therefore, the driving power PDR is provided to the second end of the power line 221 via the power transmitting terminal TPT2 and the power receiving terminal TPR2.

[0022] In addition, the transmitting port 211_1 also includes a reference terminal TR3. The transmitting port 211_2 also includes a reference terminal TR4. When the transmitting port 211_1 is connected to the receiving port 222_1 and the transmitting port 211_2 is connected to the receiving port 222_2, the reference terminals TR1 and TR2 and the reference terminals of the light-emitting elements LD1~LDn are connected to the reference low voltage in the control circuit 210 through the reference terminals TR3 and TR4.

[0023] In this embodiment, the transmitting ports 211_1 and 211_2 can be implemented by connectors well known to those skilled in the art.

[0024] Please refer to Figure 4, which is a schematic diagram of a light-emitting device according to an embodiment of the present invention. In this embodiment, the light-emitting device 300 includes a control circuit 310 and a string of light-emitting elements 320. The control circuit 310 outputs a driving power supply PDR. The string of light-emitting elements 320 includes light-emitting elements LD1~LDn, a power line 321, and receiving ports 322_1~322_2. The power line 321 is connected to the light-emitting elements LD1~LDn. The receiving port 322_1 includes a power receiving terminal TPR1 and a data receiving terminal TDR. The power receiving terminal TPR1 is connected to the first end of the power line 321. The power receiving terminal TPR1 receives the driving power supply PDR and transmits the driving power supply PDR to the first end of the power line 321. The data receiving terminal TDR is connected to the light-emitting element LD1. The data receiving terminal TDR receives the data string SD and transmits the data string SD to the light-emitting element LD1.

[0025] Similar to the embodiment in Figure 2, the data string SD is a sequence signal including data D1 to Dn. Light-emitting element LD1 receives data D1 from the data string SD and transmits the data string SD to light-emitting element LD2. Light-emitting element LD2 receives data D2 from the data string SD and transmits the data string SD to light-emitting element LD3, and so on.

[0026] In this embodiment, the receiving port 322_2 includes a power receiving terminal TPR2. The power receiving terminal TPR2 is connected to the second end of the power line 321. The power receiving terminal TPR2 receives the drive power supply PDR and transmits the drive power supply PDR to the second end of the power line 321.

[0027] In this embodiment, the receiving port 322_3 is connected to the control circuit 310 and the power line 321. The receiving port 322_3 provides the drive power PDR to node ND of the power line 321. Node ND of the power line 321 is located between the first end and the second end of the power line 321. Therefore, the voltage values ​​at both ends of the power line 321 and node ND are approximately the same.

[0028] In this embodiment, the receiving port 322_3 includes a power receiving terminal TPR3. The power receiving terminal TPR3 is connected to a node of the power line 321. The power receiving terminal TPR3 receives the drive power supply PDR and transmits the drive power supply PDR to node ND of the power line 321.

[0029] In addition, receiving port 322_1 also includes a reference terminal TR1. Receiving port 322_2 also includes a reference terminal TR2. Receiving port 322_3 also includes a reference terminal TR3. The reference terminals TR1~TR3 are connected to the reference low voltage together with the reference terminals of the light-emitting elements LD1~LDn.

[0030] In this embodiment, receiving ports 322_1 to 322_3 can be implemented by connectors well known to those skilled in the art.

[0031] Please refer to FIG5, which is a schematic diagram of a light-emitting device according to an embodiment of the present invention. In this embodiment, the control circuit 310 includes transmitting ports 311_1 to 311_3 and a driving circuit 312. Transmitting port 311_1 is operable to be connected to receiving port 322_1. Transmitting port 311_2 is operable to be connected to receiving port 322_2. Transmitting port 311_3 is operable to be connected to receiving port 322_3. The driving circuit 312 is connected to transmitting ports 311_1 to 311_3. The driving circuit 312 generates a driving power supply PDR and provides the driving power supply PDR to transmitting ports 311_1 to 311_3. The driving power supply PDR is provided to a first end of power line 321 via transmitting port 311_1 and receiving port 322_1. The driving power supply PDR is also provided to a second end of power line 321 via transmitting port 311_2 and receiving port 322_2. In addition, the drive power supply PDR is also provided to node ND of power line 221 via transmit port 311_3 and receive port 322_3.

[0032] The control circuit 210 also includes a data generator 313. The data generator 313 is connected to the transmitting port 311_1. The data generator 313 generates a data string SD and provides the data string SD to the transmitting port 311_1. The data string SD is provided to the light-emitting element LD1 via the transmitting port 311_1 and the receiving port 322_1.

[0033] In this embodiment, the transmitting port 311_1 includes a power transmitting end TPT1 and a data transmitting end TDT. The power transmitting end TPT1 is connected to the driving circuit 312. The data transmitting end TDT is connected to the data generator 313. When the transmitting port 311_1 is connected to the receiving port 322_1, the power transmitting end TPT1 is connected to the power receiving end TPR1. The data transmitting end TDT is connected to the data receiving end TDR. Therefore, the driving power PDR is provided to the first end of the power line 321 via the power transmitting end TPT1 and the power receiving end TPR1. The data string SD is provided to the light-emitting element LD1 via the data transmitting end TDT and the data receiving end TDR.

[0034] In this embodiment, the transmitting port 311_2 includes a power transmitting terminal TPT2. The power transmitting terminal TPT2 is connected to the driving circuit 312. When the transmitting port 311_2 is connected to the receiving port 322_2, the power transmitting terminal TPT2 is connected to the power receiving terminal TPR2. Therefore, the driving power PDR is provided to the second end of the power line 321 via the power transmitting terminal TPT2 and the power receiving terminal TPR2. The transmitting port 311_3 includes a power transmitting terminal TPT3. The power transmitting terminal TPT3 is connected to the driving circuit 312. When the transmitting port 311_3 is connected to the receiving port 322_3, the power transmitting terminal TPT3 is connected to the power receiving terminal TPR3. Therefore, the driving power PDR is provided to node ND of the power line 321 via the power transmitting terminal TPT3 and the power receiving terminal TPR3.

[0035] Transmitting port 311_1 also includes a reference terminal TR4. Transmitting port 311_2 also includes a reference terminal TR5. When transmitting port 311_1 is connected to receiving port 322_1, transmitting port 311_2 is connected to receiving port 322_2, and transmitting port 311_3 is connected to receiving port 322_3, the reference terminals TR1~TR3 and the reference terminals of the light-emitting elements LD1~LDn are connected to the reference low voltage in the control circuit 310 via the reference terminals TR4~TR6.

[0036] In this embodiment, the transmitting ports 311_1 to 311_3 can be implemented by connectors well known to those skilled in the art.

[0037] In summary, the light-emitting device includes a string of light-emitting elements, a power line, and a plurality of receiving ports. The plurality of receiving ports provide driving power to both ends of the power line. The voltage values ​​at both ends of the power line of the light-emitting element string are consistent. In this way, the plurality of light-emitting elements can accurately perform the expected light-emitting effect. Furthermore, in some embodiments, the plurality of receiving ports provide driving power to both ends of the power line and to the nodes located between the two ends. In this way, the voltage values ​​at both ends of the power line and the nodes of the light-emitting element string are consistent.

[0038] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims. [Simplified Explanation of the Diagram]

[0039] FIG1 is a schematic diagram of a light-emitting device according to an embodiment of the present invention. FIG2 is a schematic diagram of a light-emitting device according to an embodiment of the present invention. FIG3 is a schematic diagram of a light-emitting device according to an embodiment of the present invention. FIG4 is a schematic diagram of a light-emitting device according to an embodiment of the present invention. FIG5 is a schematic diagram of a light-emitting device according to an embodiment of the present invention.

Claims

1. A light-emitting device, comprising: The control circuit is configured to output drive power. The system includes: a plurality of light-emitting elements, including a first-level light-emitting element located at a first end of the light-emitting element string and a last-level light-emitting element located at a second end of the light-emitting element string; a power line connected to the plurality of light-emitting elements, the first end of the power line being connected to the first-level light-emitting element and the second end of the power line being connected to the last-level light-emitting element; a first receiving port connected to the control circuit, the first-level light-emitting element, and the first end of the power line, configured to provide the driving power to the first end of the power line; and a second receiving port connected to the control circuit, the last-level light-emitting element, and the second end of the power line, configured to provide the driving power to the second end of the power line, wherein the first receiving port includes: a data receiving end connected to the first-level light-emitting element, configured to receive a data string and transmit the data string to the first-level light-emitting element.

2. The light-emitting device as claimed in claim 1, wherein the first receiving port further comprises: A first power receiving terminal is connected to the first end of the power line and configured to receive the driving power and transmit the driving power to the first end of the power line.

3. The light-emitting device as claimed in claim 1, wherein the first-stage light-emitting element receives first data in the data string and transmits the data string to the second-stage light-emitting element.

4. The light-emitting device as claimed in claim 3, wherein the second-stage light-emitting element receives second data in the data string and transmits the data string to the third-stage light-emitting element.

5. The light-emitting device as claimed in claim 2, wherein the second receiving port comprises: The second power receiving terminal is connected to the second end of the power line and is configured to receive the driving power and transmit the driving power to the second end of the power line.

6. The light-emitting device as claimed in claim 1, wherein the control circuitry comprises: The first transmitting port is connected to the first receiving port; The second transmitting port is connected to the second receiving port; A drive circuit, connected to the first transmit port and the second transmit port, configured to generate the drive power and provide the drive power to the first transmit port and the second transmit port, wherein the drive power is provided to the first end of the power line via the first transmit port and the first receive port, and wherein the drive power is provided to the second end of the power line via the second transmit port and the second receive port.

7. The light-emitting device as claimed in claim 6, wherein the control circuitry further comprises: A data generator, connected to the first transmitting port, is configured to generate a data string and provide the data string to the first transmitting port.

8. The light-emitting device as claimed in claim 6, wherein the plurality of light-emitting elements further comprises: A third receiving port, connected to the control circuit and the power line, is configured to provide the drive power to a node of the power line, wherein the node of the power line is located between the first end and the second end of the power line.

9. The light-emitting device as claimed in claim 8, wherein the control circuitry further comprises: A third transmitting port is connected to the third receiving port, wherein the drive power is provided to the node of the power line via the third transmitting port and the third receiving port.

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