Electronic device

Abstract

An electronic device comprises a power supply, a light source and a driver. The power supply comprises a control signal end and an output end; the light source is electrically connected with the output end; the driver is electrically connected with the control signal end and comprises a signal source and a signal conversion circuit, the signal conversion circuit is electrically connected with the signal source and the control signal end and comprises a switch, the switch comprises a control end, and the signal source is electrically connected with the control end of the switch.

Description

Technical Field

[0001] This disclosure relates to an electronic device, specifically an electronic device that dynamically adjusts the emission of a light source. Background Technology

[0002] In backlight driving for LED devices such as Mini LEDs or Micro LEDs, the design has gradually shifted from a single LED driver that combines LED power driving and current balancing functions to a separate LED driver and power control unit design that does not require a power controller. However, with this architecture, because the LED driver and power control unit are independent, the feedback control methods and control logic of LED drivers from different companies are not the same. This means that the peripheral parameters of the feedback node between the power control unit and the LED driver need to be specially calculated and matched to meet the requirements of circuit operation, resulting in a highly customized power control unit that is difficult to meet actual needs.

[0003] Therefore, it is necessary to provide a novel electronic device to improve the aforementioned problems. Summary of the Invention

[0004] This disclosure provides an electronic device comprising: a power supply including a control signal terminal and an output terminal; a light source electrically connected to the output terminal; and a driver electrically connected to the control signal terminal, and comprising: a signal source; and a signal conversion circuit electrically connected to the signal source and the control signal terminal, wherein the signal conversion circuit includes a switch, the switch including a control terminal, and the signal source electrically connected to the control terminal of the switch.

[0005] Other novel features of this disclosure will become clearer from the following detailed description and in conjunction with the accompanying drawings. Attached Figure Description

[0006] Figure 1 A schematic diagram of the structure of the electronic device disclosed herein is shown;

[0007] Figure 2 The curve showing the relationship between the control voltage and the output voltage of the power supply according to this disclosure is displayed.

[0008] Figure 3 A circuit diagram of a signal conversion circuit according to an embodiment of the present disclosure is shown;

[0009] Figure 4 A circuit diagram of a signal conversion circuit according to another embodiment of the present disclosure is shown;

[0010] Figure 5A circuit diagram of a signal conversion circuit 155 according to another embodiment of the present disclosure is shown;

[0011] Figure 6A This disclosure shows an embodiment of current balancing and dimming control of a light-emitting diode unit;

[0012] Figure 6B This disclosure shows another embodiment of current balancing and dimming control of a light-emitting diode unit;

[0013] Figure 6C This disclosure shows another embodiment of current balancing and dimming control of a light-emitting diode unit;

[0014] Figure 6D This disclosure shows another embodiment of current balancing and dimming control of a light-emitting diode unit;

[0015] Figure 6E This disclosure shows another embodiment of current balancing and dimming control of a light-emitting diode unit;

[0016] Figure 6F This disclosure shows another embodiment of current balancing and dimming control of a light-emitting diode unit.

[0017] The meanings of the reference numerals in the above figures are as follows:

[0018] Electronic device 1

[0019] Power supplies 11, 11-R, 11-G, 11-B

[0020] Light source 13

[0021] Drives 15, 15-R, 15-G, 15-B

[0022] Signal conversion circuit 155

[0023] Signal source 153

[0024] LED driver circuit 151

[0025] Switches 31, 41, 51

[0026] Resistors R1, R2, R3, R4

[0027] Control terminals b, g

[0028] Connection terminals e, c, d, s

[0029] Digital to Analog Circuit 43

[0030] Light-emitting diode units 61, 61-R, 61-G, 61-B, 61-S, 61-E

[0031] District 65

[0032] Control voltage Vctl

[0033] Output voltage Vout Detailed Implementation

[0034] The following describes the implementation of this disclosure through specific embodiments. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. This disclosure can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed for different viewpoints and applications without departing from the spirit of this invention.

[0035] It should be noted that, unless otherwise specified herein, the presence of an element "a" is not limited to having a single element, but may include one or more of the elements. Furthermore, the ordinal numbers used in the specification and claims, such as "first" and "second," to modify elements of a claim, do not in themselves imply or represent any prior ordinal number for that claimed element, nor do they represent the order of one claimed element with another, or the order of manufacturing processes. The use of these ordinal numbers is solely for the purpose of clearly distinguishing one claimed element with a given name from another claimed element with the same name.

[0036] Throughout this disclosure and in the appended claims, certain terms are used to refer to specific elements. Those skilled in the art will understand that electronic device manufacturers may use different names to refer to the same element. This document is not intended to distinguish between elements that have the same function but different names. In the following description and claims, words such as “comprising,” “containing,” and “having” are open-ended terms and should therefore be interpreted as “containing but not limited to…”. Therefore, when the terms “comprising,” “containing,” and / or “having” are used in the description of this disclosure, they specify the presence of the corresponding feature, area, step, operation, and / or component, but do not exclude the presence of one or more of the corresponding feature, area, step, operation, and / or component.

[0037] In this text, the terms "about," "approximately," "actually," and "roughly" typically indicate within 10%, 5%, 3%, 2%, 1%, or 0.5% of a given value or range. The given quantity is an approximate quantity; that is, even without specific mention of "about," "approximately," "actually," or "roughly," the meaning of these terms can still be implied. Furthermore, the phrases "range from the first value to the second value" or "range between the first value and the second value" indicate that the range includes the first value, the second value, and other values ​​in between.

[0038] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It is understood that such terms, for example, as defined in commonly used dictionaries, shall be interpreted as having a meaning consistent with the relevant art and the background or context of this disclosure, and shall not be interpreted in an idealized or overly formal manner, unless specifically defined herein.

[0039] Furthermore, relative terms such as "below" or "bottom" and "above" or "top" may be used in the embodiments to describe the relative relationship of one element to another in the figures. It is understood that if the apparatus in the figures is flipped upside down, the element described as being on the "below" side will become the element on the "above" side. When a corresponding component (e.g., a membrane or region) is referred to as "on another component," it can be directly on the other component, or there may be other components between them. On the other hand, when a component is referred to as "directly on another component," there are no components between them. Additionally, when a component is referred to as "on another component," there is a vertical relationship between them in the top view, and this component can be above or below the other component, depending on the orientation of the apparatus.

[0040] In this disclosure, the thickness can be measured using an optical microscope or by measuring a cross-sectional image from an electron microscope, but this disclosure is not limited to these methods. Furthermore, any two values ​​or directions used for comparison may have a certain degree of error. If the first value equals the second value, it implies an error of approximately 10% between the first and second values; if the first direction is perpendicular to the second direction, the angle between the first and second directions can be between 80 and 100 degrees; if the first direction is parallel to the second direction, the angle between the first and second directions can be between 0 and 10 degrees.

[0041] Furthermore, the electronic devices disclosed herein may include, but are not limited to, display devices, light source devices, backlight devices, antenna devices, sensing devices, or splicing devices. The electronic devices may be bendable or flexible. The display devices may be non-emissive or emissive display devices. The antenna devices may be liquid crystal type antenna devices or non-liquid crystal type antenna devices. The sensing devices may be sensing devices that sense capacitance, light, heat, or ultrasound, but are not limited to these. Electronic components may include passive and active components, such as capacitors, resistors, inductors, diodes, transistors, etc. Diodes may include light-emitting diodes (LEDs) or photodiodes. Light-emitting diodes may include, for example, organic light-emitting diodes (OLEDs), mini LEDs, micro LEDs, or quantum dot LEDs, but are not limited to these. Splicing devices may be, for example, display splicing devices or antenna splicing devices, but are not limited to these. It should be noted that the electronic devices may be any arrangement and combination of the foregoing, but are not limited to these.

[0042] It should be noted that the technical solutions provided in the different embodiments below can be substituted for, combined or mixed with each other to constitute another embodiment without violating the spirit of this disclosure.

[0043] Please refer to Figure 1 The diagram shows the structure of the electronic device 1 disclosed herein. The electronic device 1 is illustrated by an example of a light-emitting diode (LED) light source device. The electronic device 1 includes a power supply 11, a light source 13, and a driver 15. The power supply 11 includes a control signal terminal PV and an output terminal OT. The light source 13 is electrically connected to the output terminal OT of the power supply 11. The driver 15 is electrically connected to the control signal terminal PV of the power supply 11. The driver 15 includes a signal conversion circuit 155 and a signal source 153. The signal conversion circuit 155 is electrically connected to the signal source 153 and the control signal terminal PV of the power supply 11. The signal source 153 is electrically connected to an LED driving circuit 151 or is a part of the LED driving circuit 151.

[0044] The aforementioned power supply 11 can be a power supply unit (PSU). The power supply 11 can be electrically connected to an external power source providing an external voltage Vin. An external voltage adjustment function pin (PVpin) of the power supply unit is used as the control signal terminal PV. The power supply unit can generate an output voltage Vout at the output terminal OT based on the control voltage Vctl input to the control signal terminal PV. The relationship between the control voltage Vctl input to the control signal terminal PV and the output voltage Vout generated at the output terminal OT can be as follows: Figure 2 The curve shown represents a positive control logic, meaning there is a linear relationship between the control voltage Vctl input from the control signal terminal PV and the output voltage Vout output from the output terminal OT. For example, but not limited to, the control voltage Vctl and output voltage Vout being directly proportional, or the ratio of control voltage Vctl to output voltage Vout being a constant value. Please refer to the following: Figure 1 With the electronic device 1 disclosed herein, a feedback function pin (FB function pin) of the light-emitting diode driving circuit 151 can be used as a signal source 153. The disturbance signal output by the signal source 153 (i.e., the feedback function pin FB) is converted into a control voltage Vctl for the power supply 11 via the signal conversion circuit 155. This control voltage Vctl is connected to the control signal terminal PV of the power supply 11, thereby dynamically controlling the output voltage Vout generated by the output terminal OT of the power supply 11.

[0045] Figure 3This diagram illustrates a signal conversion circuit 155 according to an embodiment of the present disclosure, suitable for converting disturbance signals in the form of resistors. More specifically, the signal conversion circuit 155 may include, for example, a switch 31, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The switch 31 is, for example, a bipolar junction transistor (BJT) and has a control terminal b, a first connection terminal e, and a second connection terminal c. The control terminal b, the first connection terminal e, and the second connection terminal c are, for example, the base, emitter, and collector of the BJT, respectively. The control terminal b of the switch 31 is connected to one end of the third resistor R3, the first connection terminal e of the switch 31 is grounded (FB_GND), and the second connection terminal c of the switch 31 is connected to one end of the second resistor R2 and then connected to the control signal terminal PV of the power supply 11. One end of the first resistor R1 is connected to the other end of the second resistor R2 and then to a supply voltage V1. One end of the fourth resistor R4 is connected to the other end of the third resistor R3 and the other end of the first resistor R1, and the other end of the fourth resistor R4 is connected to the signal source 153. Since the signal source 153 represents a perturbation signal in the form of a resistor, it can be considered as a variable resistor with a variable resistance. The signal conversion circuit 155, after being electrically connected to this variable resistor, forms a circuit affected by the perturbation signal. In the circuit architecture of the signal conversion circuit 155 with the variable resistor added, since the signal source 153 is electrically connected to the control terminal b of the switch 31 via resistors R4 and R3, the switch 31 can operate in response to the signal source 153. The voltage value of the control voltage Vctl can change with the perturbation signal in the form of a resistor from the signal source 153, and is input to the control signal terminal PV of the power supply 11 to control the output voltage Vout generated by the output terminal OT. It should be noted that in this disclosure, the supply voltage V1 can be a stable output voltage, and its voltage value can be determined according to actual needs, such as 5V, 3V or 12V.

[0046] Figure 4This diagram illustrates a signal conversion circuit 155 according to another embodiment of the present disclosure, suitable for converting PWM-type disturbance signals. The signal conversion circuit 155 includes a switch 41, a first resistor R1, a second resistor R2, and a digital-to-analog converter 43. The switch 41 is, for example, a metal-oxide-semiconductor field-effect transistor (MOSFET) and has a control terminal g, a first connection terminal s, and a second connection terminal d. The control terminal g, the first connection terminal s, and the second connection terminal d are, for example, the gate, source, and drain of the MOSFET, respectively. The control terminal g of the switch 41 is connected to a signal source 153, which provides the PWM signal. The first connection terminal s of the switch 41 is connected to one end of the second resistor R2 and then grounded (GND). The second connection terminal d of the switch 41 is connected to one end of the first resistor R1 and the other end of the second resistor R2, and then connected to one end of the digital-to-analog converter 43. The other end of the first resistor R1 is connected to a supply voltage V1, and the other end of the digital-to-analog circuit 43 is connected to the control signal terminal PV of the power supply 11. The digital-to-analog circuit 43 is, for example but not limited to, a resistor-capacitor filter (RC filter), which can convert digital signals into analog signals through RC filtering. In the circuit architecture of the above signal conversion circuit 155, since the PWM form of the disturbance signal of the signal source 153 can be transmitted to the control terminal g of the switch 41, the switch 41 can operate in response to the signal source 153. Therefore, the voltage value of the control voltage Vctl can change with the PWM form of the disturbance signal of the signal source 153, so as to control the output voltage Vout generated by the output terminal OT by inputting to the control signal terminal PV of the power supply 11.

[0047] Figure 5 This diagram shows a circuit schematic of a signal conversion circuit 155 according to another embodiment of the present disclosure, which is suitable for converting disturbance signals in the form of current, wherein... Figure 3Similar to the illustrated embodiment, the signal conversion circuit 15 includes a switch 51, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The switch 51 is, for example, a bipolar junction transistor (BJT) with a control terminal b, a first connection terminal e, and a second connection terminal c. The control terminal b, the first connection terminal e, and the second connection terminal c are, for example, the base, emitter, and collector of the BJT, respectively. The control terminal b of switch 51 is connected to one end of the third resistor R3. The first connection terminal e of switch 51 is grounded. The second connection terminal c of switch 51 is connected to one end of the second resistor R2 and then to the control signal terminal PV of the power supply 11. The other end of the second resistor R2 is connected to a second supply voltage V2. One end of the first resistor R1, the other end of the third resistor R3, and one end of the fourth resistor R4 are connected. The other end of the first resistor R1 is connected to a first supply voltage V1, and the other end of the fourth resistor R4 is connected to the signal source 153. Figure 3 The main difference in the illustrated embodiment is that the signal source 153 provides a current signal. In the circuit architecture of the signal conversion circuit 155 described above, since the signal source 153 is electrically connected to the control terminal b of the switch 51 via resistors (R4, R3), the current-form disturbance signal can be transmitted to the control terminal b of the switch 51. Therefore, the switch 51 can operate in response to the signal source 153, thus converting the current-form disturbance signal of the signal source 153 into a control voltage Vctl, which is input to the control signal terminal PV of the power supply 11 to control the output voltage Vout generated by the output terminal OT. It should be noted that although in Figure 5 One end of the second resistor R2 is connected to a second supply voltage V2, but in some embodiments, one end of the second resistor R2 may also be connected to a first supply voltage V1. In short, regardless of the form of the disturbance signal provided by the signal source 153, it provides a variable, and the signal conversion circuit 155 paired with this variable can convert the stable supply voltages V1 and V2 into a control voltage Vctl.

[0048] For further details, please refer to [link / reference]. Figure 1The aforementioned light source 13 is powered by connecting its positive terminal (+) to the output terminal OT of the power supply 11 to emit light, and its negative terminal (-) to the light-emitting diode driving circuit 151 for current balancing and dimming control. The light source 13 includes at least one light-emitting diode (LED) unit 61, and a plurality of LED units 61 can be further configured in series, parallel, or a combination of series and parallel, etc. The driver 15 of this disclosure is used to achieve current balancing and dimming control of the LED units 61. The LED units 61 are, for example, but not limited to, point-shaped (e.g., LED bulbs), line-shaped (e.g., LED strips), and area-shaped light sources formed by organic light-emitting diodes (OLEDs), mini LEDs, micro LEDs, or quantum dot LEDs.

[0049] Figure 6A This disclosure illustrates an embodiment of current balancing and dimming control of LED units 61, wherein the light source 13 includes at least one LED unit 61. The first terminal (i.e., the positive terminal (+)) and the second terminal (i.e., the negative terminal (-)) of the LED unit 61 are electrically connected to the output terminal OT of the power supply 11 and the LED driving circuit 151 of the driver 15, respectively. In this embodiment, as shown, the light source 13 can be divided into multiple regions 65 for current balancing and dimming control. Each region 65 has one LED unit 61. The positive terminals (+) of all LED units 61 are electrically connected to the output terminal OT of the power supply 11 to be powered by the same power supply 11, and the negative terminals (-) of all LED units 61 are electrically connected to the LED driving circuit 151 of the driver 15 to be driven to emit light using the same driver 15. This allows for current balancing and dimming control of the multiple LED units 61.

[0050] Figure 6BThis disclosure shows another embodiment of current balancing and dimming control of the light-emitting diode unit 61, wherein the light source 13 includes a plurality of light-emitting diode units 61 connected in series to form at least one light-emitting diode string, and the first terminal (i.e., the positive terminal (+)) of the first light-emitting diode unit 61-s and the second terminal (i.e., the negative terminal (-)) of the last light-emitting diode unit 61-e are respectively electrically connected to the output terminal OT of the power supply 11 and the light-emitting diode driving circuit 151 of the driver 15. In this embodiment, as shown in the figure, the light source 13 can be divided into multiple zones 65 for current balancing and dimming control. Each zone 65 has multiple light-emitting diode units 61 connected in series to form a light-emitting diode string. The positive terminal (+) of the first light-emitting diode unit 61-s in each zone 65 is connected to the output terminal OT of the power supply 11 so that the same power supply 11 is used for power supply. The negative terminal (-) of the last light-emitting diode unit 61-e in each zone 65 is connected to the light-emitting diode driving circuit 151 of the driver 15 so that the same driver 15 is used to drive the light emission. Based on this, current balancing and dimming control of multiple light-emitting diode units 61 are performed.

[0051] Figure 6C This disclosure shows another embodiment of current balancing and dimming control of the light-emitting diode unit 61, wherein, similar to Figure 6B In this embodiment, the light source includes a plurality of light-emitting diode units 61 connected in series to form at least one light-emitting diode string, and the light source 13 can be divided into a plurality of regions 65 for current balancing and dimming control. In this embodiment, as shown in the figure, each region 65 has a plurality of light-emitting diode units 61 connected in series to form a plurality of light-emitting diode strings. Figure 6C The illustration shows that each zone 65 has two LED strings, but this is only an example and not a limitation. The positive terminal (+) of the first LED unit 61-s of the majority LED strings in each zone 65 is connected to the output terminal OT of the power supply 11 so that they are powered by the same power supply 11. The majority LED strings in each zone 65 are connected in parallel with the negative terminal (-) of their last LED unit 61-e and then connected to the LED driving circuit 151 of the driver 15 so that they are driven to emit light using the same driver 15. This enables current balancing and dimming control of the majority LED units 61.

[0052] Figure 6DThis disclosure shows another embodiment of current balancing and dimming control of the LED unit 61. The LED unit 61 includes a red LED unit 61-R, a green LED unit 61-G, and a blue LED unit 61-B. Since the LED units 61-R, 61-G, and 61-B of different colors can have different internal reference voltages, they are powered by different power supplies 11-R, 11-G, and 11-B, respectively, and can still be driven to emit light using the same driver 15. The configuration of any color LED unit 61-R, 61-G, and 61-B in the light source 13 of this embodiment is similar to... Figure 6B The embodiments are the same, so they will not be described again. It should also be noted that... Figure 6D The two strings of LED units 61-R, two strings of green LED units 61-G, and two strings of blue LED units 61-B shown are merely examples. In other embodiments, the number of strings of LEDs of each color can be one, three, or more. Furthermore, in some embodiments, the number of strings of LEDs of each color can be the same or different depending on actual design requirements. Additionally, in this disclosure, the number of LEDs in each string can be the same or different.

[0053] Figure 6E This disclosure shows another embodiment of current balancing and dimming control of the light-emitting diode unit 61, wherein the configuration of the light-emitting diode unit 61 in this embodiment is similar to... Figure 6D The embodiment differs in that the LED units 61-R, 61-G, and 61-B of different colors are driven to emit light using different drivers 15-R, 15-G, and 15-B, respectively. Since the description of current balance and dimming control for multiple LED units 61 in this embodiment can also be applied to… Figure 6D The embodiments are as described above, so they will not be repeated here.

[0054] Figure 6F This disclosure shows another embodiment of current balancing and dimming control of the light-emitting diode unit 61, wherein the configuration of the light-emitting diode unit 61 in this embodiment is similar to... Figure 6D The embodiment differs in that the LED units 61-R, 61-G, and 61-B of each color are connected in series to form at least one LED string, and multiple LED strings of the same color are connected in parallel with the negative terminal (-) of their last LED unit 61-e before being connected to the LED driving circuit 151 of the driver 15 so that the same driver 15 can be used to drive the light emission. Since the description of the current balance and dimming control of multiple LED units 61 in this embodiment can also be applied to Figure 6D The embodiments are as described above, so they will not be repeated here.

[0055] As can be seen from the above description, the electronic device of this disclosure converts various forms of disturbance signals from the signal source into control voltages for the power supply via a signal conversion circuit through a feedback function pin provided by the LED driving circuit. This control voltage is then connected to the voltage adjustment function pin of the power supply unit to control the output voltage. Since this control does not directly disturb the feedback reference node of the power supply unit, and the control voltage signal and the output voltage are positive control logic, dynamic adjustment of the light emission of the light source can be quickly and easily achieved.

[0056] Features of the various embodiments disclosed herein can be arbitrarily combined and used as long as they do not violate the spirit of the invention or conflict with it.

[0057] The above embodiments are merely illustrative examples for ease of explanation. The scope of protection claimed in this disclosure should be determined by the claims of this disclosure, and not limited to the above embodiments.

Claims

1. An electronic device, characterized in that, include: A power supply, including a control signal terminal and an output terminal; A light source is electrically connected to this output terminal; as well as A driver, electrically connected to the control signal terminal, and comprising: A signal source; and A signal conversion circuit electrically connects the signal source and the control signal terminal. The signal conversion circuit includes a switch with a control terminal, and the signal source is electrically connected to the control terminal of the switch.

2. The electronic device according to claim 1, characterized in that, in, The switch is a metal-oxide-semiconductor field-effect transistor.

3. The electronic device according to claim 1, characterized in that, in, The switch is a bipolar junction transistor.

4. The electronic device according to claim 1, characterized in that, in, The signal source provides a PWM signal to the control terminal of the switch in the signal conversion circuit.

5. The electronic device according to claim 1, characterized in that, in, The signal source provides a current signal to the control terminal of the switch in the signal conversion circuit.

6. The electronic device according to claim 1, characterized in that, in, The signal conversion circuit includes a digital-to-analog converter.

7. The electronic device according to claim 1, characterized in that, in, There is a linear relationship between a control voltage input from the control signal terminal and an output voltage output from the output terminal.

8. The electronic device according to claim 1, characterized in that, in, The driver also includes a light-emitting diode (LED) driving circuit that is electrically connected to the signal source.

9. The electronic device according to claim 1, characterized in that, in, The light source includes at least one light-emitting diode (LED) unit, the output terminal is electrically connected to a first terminal of the LED unit, and the LED driving circuit is electrically connected to a second terminal of the LED unit.

10. The electronic device according to claim 1, characterized in that, in, The light source comprises a plurality of light-emitting diode units connected in series to form at least one light-emitting diode string. The output terminal is electrically connected to a first terminal of the first light-emitting diode unit in the light-emitting diode string, and the light-emitting diode driving circuit is electrically connected to a second terminal of the last light-emitting diode unit in the light-emitting diode string.

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