KR20240025238A - Electronic apparatus and the control method thereof - Google Patents

Abstract

According to embodiments, a sensor that senses an input voltage supplied from a power supply; and a processor that controls the duty of the current supplied to one or more LEDs to be 100% when the sensed input voltage is higher than the first voltage. Provides an electronic device including.

Description

Electronic devices and electronic device control methods {ELECTRONIC APPARATUS AND THE CONTROL METHOD THEREOF}

Embodiments relate to electronic devices and methods for controlling electronic devices. For example, embodiments are applied to an electronic device and an electronic device control method in which operation of the electronic device is controlled when overvoltage is introduced.

Recently, in the field of display technology, electronic devices with excellent characteristics such as thin, flexible, rollable, and stretchable have been developed. Light Emitting Diode (LED) is a semiconductor light-emitting device well known for converting current into light. Starting with the commercialization of red LED using GaAsP compound semiconductor in 1962, it has been used in information communication along with green LED of GaP:N series. It has been used as a light source for display images in electronic devices including devices.

In the case of LEDs, as they emit light on their own, it is necessary to limit the current supplied to the LEDs. For example, in order to control the on/off state of an LED or to brighten or maintain constant brightness of an LED in an on state, control of the current supplied to the LED is required. Also, for example, if a current exceeding a certain amount is supplied to the LED, there is a problem that the lifespan of the LED is shortened and/or damaged. Therefore, in order to control the driving of these LEDs, the electronic device has a separate Driver IC that controls the driving of the LEDs.

On the other hand, if overvoltage is supplied to the Driver IC, there is a problem that the Driver IC is damaged. For example, if the external power supply connected to the electronic device is damaged and more voltage than necessary is supplied inside the electronic device, the driver IC will be damaged.

To solve this problem, a method including a circuit to suppress overvoltage to protect the driver IC when overvoltage flows into the driver IC is proposed. However, in this case, there is a problem that as the number of LEDs increases, the required circuits, elements, and PCB (Printed Circuit Board) increase. Additionally, there is a problem that the driver IC is damaged during the overvoltage suppression process.

Embodiments aim to provide an electronic device and an electronic device control method that solves the above-described problem.

Embodiments aim to protect the LED and the controller that controls the LED current when overvoltage is introduced.

Embodiments aim to protect the LED and the controller that controls the LED current when overvoltage is introduced while minimizing the space occupied by the circuit and/or device for such protection.

The technical challenges to be achieved in the embodiments are not limited to the matters mentioned above, and other technical challenges not mentioned may be considered by those skilled in the art from the various embodiments described below. You can.

According to embodiments, a sensor that senses an input voltage supplied from a power supply; and a processor that controls the duty of the current supplied to one or more LEDs to be 100% when the sensed input voltage is higher than the first voltage. Provides an electronic device including.

According to embodiments, a processor provides an electronic device that controls the amount of current supplied to one or more LEDs to be less than or equal to a predetermined amount when the sensed input voltage is greater than or equal to the first voltage.

According to embodiments, the processor provides an electronic device that transmits a request to increase the feedback voltage to the power supply if the sensed input voltage is greater than or equal to the second voltage that is less than the first voltage.

According to embodiments, the processor controls the current supplied to one or more LEDs and then re-senses the input voltage supplied through the power supply through a sensor, and if the re-sensed input voltage is less than the second voltage, one An electronic device is provided that allows current supplied to one or more LEDs to be driven according to a signal.

According to embodiments, the sensor provides an electronic device connected in parallel with each of one or more LEDs.

According to embodiments, a sensor provides an electronic device that senses a voltage divided by a first resistor and a second resistor connected in series with each other.

According to embodiments, an electronic device is provided wherein the first voltage is 90% or more of a preset threshold voltage for one or more LEDs.

According to embodiments, sensing an input voltage; And if the sensed input voltage is higher than the first voltage, controlling the duty of the current supplied to one or more LEDs to be 100%; Provides a method for controlling an electronic device including.

According to embodiments, sensing the input voltage includes dividing the input voltage by a first resistor and a second resistor connected in series with each other; and sensing the divided voltage. Provides a method for controlling an electronic device including.

According to embodiments, if the sensed input voltage is greater than the second voltage but less than the first voltage, transmitting a request to increase the feedback voltage for the input voltage, where the second voltage is less than the first voltage; Provides a method for controlling an electronic device including.

According to embodiments, if the sensed input voltage is less than the second voltage, driving the current supplied to one or more LEDs according to the signal; Provides a method for controlling an electronic device including.

According to embodiments, when the sensed input voltage is higher than the first voltage, transmitting a request to increase the feedback voltage for the input voltage; Provides a method for controlling an electronic device including.

Embodiments may protect a controller that controls LED current from overvoltage supply.

Embodiments can utilize space efficiently even when the number of LEDs increases.

In embodiments, even if the number of LEDs increases, the area of required elements, circuits, and/or PCBs does not increase significantly.

The effects that can be obtained from the examples are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art based on the detailed description below. It can be.

The accompanying drawings, which are included as part of the detailed description to aid understanding of the embodiments, provide various embodiments and together with the detailed description describe technical features of the various embodiments.
Figure 1 schematically shows a driving circuit according to embodiments.
FIG. 2 shows a voltage driving mode according to FIG. 1.
Figure 3 is a block diagram schematically showing each configuration of an electronic device according to embodiments.
Figure 4 schematically shows a driving circuit according to embodiments.
5 is a flowchart explaining a method of controlling an electronic device according to embodiments.
FIG. 6 is a flowchart explaining an example of a control method for s102 in FIG. 5.
FIG. 7 shows a voltage driving mode according to FIGS. 3 to 6.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted. The suffixes “unit,” “module,” and “unit” for components used in the following description are given or used interchangeably only for the ease of preparing the specification, and do not have distinct meanings or roles in themselves. .

Additionally, in describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted. In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be.

On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

The electronic device 100 described in this specification includes all devices that are driven by supplying electrical energy. For example, the electronic device 100 includes a display device. At this time, the display device is a concept that includes all display devices that display information using a unit pixel or a set of unit pixels. Therefore, it is not limited to finished products but can also be applied to parts. For example, a panel corresponding to a part of a digital TV also independently corresponds to a display device in this specification. Finished products include mobile phones, smart phones, laptop computers, digital broadcasting terminals, PDAs (personal digital assistants), PMPs (portable multimedia players), navigation, Slate PCs, Tablet PCs, and Ultra This may include books, digital TVs, desktop computers, etc.

However, those skilled in the art will easily understand that the configuration according to the embodiments described in this specification may be applied to a device capable of displaying, even if it is a new product type that is developed in the future.

In this specification, for convenience of explanation, an example of controlling the current supplied to an LED (Light Emitting Diode) is described. However, the electronic device and electronic device control method described in this specification include not only LEDs but also all objects that are controlled and driven according to the abnormal state of the input voltage.

In this specification, for convenience of explanation, LED is exemplified as a light emitting means. However, electronic devices according to embodiments may apply any light-emitting means that converts electric current into light.

1 schematically shows a driving circuit of an electronic device according to embodiments.

The electronic device 100 according to embodiments includes at least one LED channel (LED Channel) 120. At least one LED channel 120 includes at least one LED element (eg, L1, L2, L3). The electronic device 100 includes a power supply unit 110, an overvoltage prevention circuit 130, and an LED controller 140 to drive the LED channel 120. Meanwhile, the circuit diagram of FIG. 1 is only an example, and the present invention is not limited to the circuit diagram of FIG. 1 and the configuration included in the circuit diagram.

The power supply unit 110 supplies power to the electronic device 100 from the outside. The power supply unit 110 is, for example, connected to the outside and supplies DC voltage.

The LED channel 120 receives input voltage from the power supply unit 110. The LED channel 120 emits light through the supplied voltage. The LED channel 120 emits light through one or more LED elements (eg, L1, L2, L3) included in the LED channel 120. At this time, the number of LED elements included in the LED channel 120 is not limited to three, and may be one or more. Additionally, in FIG. 1, only one LED channel 120 is shown for convenience of explanation, but the number of LED channels 120 may be one or more. When the number of LED channels 120 is one or more, each LED channel 120 is connected to each other in parallel, for example.

The LED controller 140 controls the driving of the LED channel 120. The LED controller 140 controls the driving of the LED channel 120 by adjusting the amount of current flowing into the LED channel 120. For example, the LED controller 140 controls one or more LED elements (eg, L1, L2, L3) included in the LED channel 120 to be turned on/off.

Meanwhile, the LED controller 140 controls the driving of one LED channel 120. For example, when the electronic device 100 includes two or more LED channels 120, the electronic device 100 may include two or more LED controllers 140. For example, one LED controller 140 corresponds to one LED channel 120.

The overvoltage prevention circuit 130 prevents overvoltage from flowing into the LED controller 140. At this time, the overvoltage is a voltage exceeding a preset value, and the preset value varies depending on the number and temperature of LED elements included in the LED channel 120. This preset value is a value already stored in a memory (not shown) included in the electronic device 100. Alternatively, the preset value is a value received from the outside through the communication unit 160 (see FIG. 3).

At this time, the overvoltage inflow prevention circuit 130 corresponds to a pair of LED controller 140 and LED channel 120. For example, if the electronic device 100 includes two LED channels 120 and two LED controllers 140 corresponding to each of the two LED channels 120, the electronic device 100 has two pairs. Includes two overvoltage prevention circuits 130 corresponding to each LED channel-LED controller. Each overvoltage prevention circuit 130 prevents overvoltage from flowing into the corresponding LED channel 120 and/or LED controller 140.

The voltage introduced through the power supply unit 110 is consumed in whole or in part by the LED channel 120. When a portion of the voltage introduced by the LED channel 120 is consumed, the remaining voltage flows into the LED controller 140. At this time, if the remaining voltage flowing into the LED controller 140 is overvoltage, the LED controller 140 may be damaged. To prevent this, embodiments include an overvoltage prevention circuit 130.

The overvoltage prevention circuit 130 includes, for example, a switch Q1. The overvoltage inflow prevention circuit 130 controls whether the voltage flowing in through the switch Q1 is supplied to the LED controller 140. That is, the overvoltage prevention circuit 130 controls whether voltage is supplied to the LED controller 140 through turning on/off the switch Q1. The switch Q1 is, for example, a transistor, for example, an NPN transistor. Meanwhile, the overvoltage prevention circuit 130 further includes a first ground power source (X1). The base of the switch Q1 is connected to the first ground power source X1. Through this, the overvoltage inflow prevention circuit 130 allows the remaining voltage to flow from the LED channel 120 toward the LED controller 140.

Meanwhile, the overvoltage prevention circuit 130 may further include at least one of the first resistor (R1) and the second resistor (R2). At least one of the first resistor (R1) and the second resistor (R2) is connected to the base of the switch (Q1). Through this, the overvoltage inflow prevention circuit 130 prevents a voltage exceeding a preset value from flowing into the LED controller 140.

Through this, the electronic device 100 according to the embodiments allows the LED channel 120 and/or the LED controller 140 to operate through the overvoltage prevention circuit 130 even when overvoltage flows into the electronic device 100. protect. FIG. 2 illustrates a state in which an overvoltage is introduced when the embodiments described in FIG. 1 are applied.

FIG. 2 shows a voltage driving mode according to FIG. 1.

FIG. 2 shows the magnitude of voltage over time in the electronic device 100 described in FIG. 1 .

In FIG. 2, 10 represents the input voltage to the LED channel 120 described in FIG. 1. That is, the input voltage 10 represents the voltage of the first terminal (J1, see FIG. 1). At this time, the first terminal J1 electrically connects the external power source and the power supply unit 110 and is, for example, a wire or an element.

In addition, 11 in FIG. 2 is the voltage measured by the LED controller 140 described in FIG. 1 and represents the input voltage flowing into the LED controller 140. The incoming voltage 11 is, for example, a voltage measured at the second terminal (J2, see FIG. 2) included in the LED controller 140. At this time, the second terminal J2 electrically connects the LED channel 120 and the LED controller 140 and is, for example, a wire or an element.

In Figure 2, S represents driving in a steady state. Additionally, in FIG. 2, U represents driving in an abnormal state. The normal state (S) is a state in which power having a magnitude within a certain range is constantly supplied from an external power source to the power supply unit 110. For example, in the normal state (S), the electronic device 100 is driven by the supplied power without damage to elements and/or circuits within the electronic device 100. An abnormal state (U) is, for example, a case where a voltage exceeding a preset value is introduced. The abnormal state (U) is, for example, a case where a problem occurs in the first terminal (J1) connecting the external power source and the power supply unit 110. The abnormal state (U) includes, for example, a case where the coating of the first terminal (J1) or an external wire connected to the first terminal (J1) is peeled off and the inside of the terminal or external wire touches the ground.

In the steady state (S) shown in FIG. 2, the input voltage 10 is constantly supplied to the LED channel 120. For example, the input voltage 10 is supplied to the LED channel 120 at a level less than a preset value. Accordingly, the incoming voltage 11 flows into the LED controller 140 within a preset range.

In the abnormal state (U) shown in FIG. 2, the input voltage 10 is supplied irregularly to the LED channel 120. For example, the input voltage 10 is supplied to the LED channel 120 at a level greater than a preset value. Accordingly, the incoming voltage 11 flows into the LED controller 140 beyond the preset range.

At this time, as shown in FIG. 2, in the case of an abnormal state (U), the overvoltage inflow prevention circuit 130 prevents current from flowing in the LED channel 120 in the section where overvoltage is applied to the LED controller 140 ( Current off section). Accordingly, embodiments can prevent the LED controller 140 from being destroyed due to excessive voltage exceeding a preset value even when the input voltage 10 is in an abnormal state (U).

However, prevention of destruction of the LED controller 140 may be temporary. For example, the input voltage may continue to flow into the LED channel 120 even after a current off period occurs. At this time, even though the input voltage continues to flow in, no voltage is consumed in the LED channel 120 in the current-off section of the LED channel 120. That is, the voltage flowing into the LED controller 140 becomes the maximum voltage. Accordingly, the LED controller 140 may be destroyed.

In addition, in order to prevent overvoltage from entering the LED channel 120 and the LED controller 140 that controls the operation of the LED channel 120, a pair of LED channels 120 - correspond to the LED controller 140. Therefore, one overvoltage inflow prevention circuit 130 is required. For example, the electronic device 100 may include a mini LED or micro LED as a light emitting means. In this case, the electronic device 100 includes more LED channels as the number of LEDs increases. The electronic device 100 should include more overvoltage prevention circuits. That is, as the number of LED channels 120 in the electronic device 100 increases, the number of elements required increases and/or the area of the printed circuit board (PCB) on which the LED channels 120 are mounted is required to increase.

Therefore, hereinafter, an electronic device that prevents overvoltage from flowing into the LED controller 140 and does not require a large increase in the number of elements and/or PCB area will be described in detail.

Figure 3 is a block diagram schematically showing each configuration of an electronic device according to embodiments.

The electronic device 100 according to embodiments outputs an image through, for example, supplied electrical energy. The electronic device 100 includes a display (not shown) that outputs an image. At this time, the image includes all forms of visual information that can be output, such as dots, lines, 2D still images, 2D videos, 3D still images, and 3D videos.

The electronic device 100 includes a power supply unit 110, an LED channel 120, an LED controller 140, a voltage sensing unit 150, and a communication unit 160. However, this is an example, and the electronic device 100 may further include other components in addition to the components shown in FIG. 3, or may include less of the components shown in FIG. 3.

The power supply unit 110 receives external power and supplies voltage to each component included in the electronic device 100. For this purpose, for example, the power supply unit 110 includes a terminal (eg, J1 in FIG. 1 and J3 in FIG. 4) that can be electrically connected to an external power source. Alternatively, the power supply unit 110 includes a battery (not shown) built into the electronic device 100 or removable from the electronic device 100. For example, the power supply unit 110 transfers the voltage supplied through the terminal J3 to the LED channel 120 and/or the voltage sensing unit 150.

The LED channel 120 is built into the display and allows the display to output images. For example, the LED channel 120 is mounted on a printed circuit board (PCB). The LED channel 120 is electrically connected to components included in the electronic device 100 through a circuit printed on a PCB. For example, the LED channel 120 receives input voltage from the power supply unit 110 through a circuit.

The LED channel 120 includes, for example, one or more LEDs to emit light. The LED channel 120 allows the display to output images through one or more LEDs that emit red (R), green (G), and/or blue (B) light.

At this time, each of one or more LEDs is, for example, a unit pixel of an image output by the electronic device 100. A unit pixel is, for example, the minimum unit for implementing one color. LED is a type of semiconductor light-emitting device that converts electric current into light, and is a light-emitting diode. Meanwhile, the LED channel 120 may include any type of light-emitting device instead of LED.

Meanwhile, the LED channel 120 adjusts the brightness of the display through the on/off status of one or more LEDs. For example, the LED channel 120 shortens the on-state period so that the brightness of the display becomes brighter. Or, for example, the LED channel 120 has a long on-state period so that the brightness of the display becomes dark.

The electronic device 100 may include, for example, a plurality of LED channels 120. Each of the plurality of LED channels 120 is, for example, connected to each other in parallel. Through this, each LED channel 120 receives an input voltage of the same or similar range from the power supply unit 110.

The LED controller 140 controls the driving of the LED channel 120. The LED controller 140 controls the driving of the LED channel 120 by adjusting the amount of current flowing into the LED channel 120. For example, the LED controller 140 controls the duty of the LED channel 120 according to the processor 152. Through this, the LED controller 140 causes the LED channel 120 to emit appropriate brightness and color.

The voltage sensing unit 150 senses the input voltage and determines whether the input voltage is overvoltage. When overvoltage is sensed, the voltage sensing unit 150 causes the LED controller 140 to drive a microcurrent. Through this, the voltage sensing unit 150 prevents overvoltage from flowing into the LED channel 120 and/or the LED controller 140.

Specifically, the voltage sensing unit 150 includes a sensor 151 and a processor 152.

The sensor 151 senses the input voltage supplied from the power supply unit 110. That is, the sensor 151 senses the input voltage input to the LED channel 120. The sensor 151 is connected in parallel with the LED channel 120, for example. When the electronic device 100 includes a plurality of LED channels 120, the sensor 151 is arranged to be connected in parallel with each of the plurality of LED channels 120. Through this, the electronic device 100 can sense the input voltage supplied to each of the plurality of LED channels 120 at once even through one sensor 151.

The processor 152 determines whether the sensed input voltage is higher than a predetermined voltage.

For example, the processor 152 determines whether the input voltage is greater than or equal to a preset value. For example, if a voltage exceeding a preset value is introduced, the processor 152 determines that an overvoltage has been introduced.

In this way, overvoltage is a voltage above a preset value. The preset value varies depending on the number and temperature of LED elements included in the LED channel 120. This preset value is a value already stored in a memory (not shown) included in the electronic device 100. Alternatively, the preset value is a value received from the outside through the communication unit 160 (see FIG. 3).

The processor 152 controls the current supplied to the LED channel 120 according to the sensed input voltage. The processor 152 controls the current supplied to the LED channel 120 by controlling the duty of the current supplied to the LED channel 120 according to the input voltage. At this time, duty represents the on/off ratio of the LED. For example, when the duty is 0%, one or more LEDs included in the LED channel 120 are completely turned off. For example, when the duty is 100%, one or more LEDs included in the LED channel 120 are continuously turned on.

For example, if the processor 152 determines that the input voltage is higher than a preset value, it transmits this to the LED controller 140. That is, when it is determined that overvoltage has been introduced, the processor 152 controls the LED controller 140 to protect the LED channel 120 and/or the LED controller 140 from overvoltage. For example, if the input voltage is higher than a preset value, the processor 152 controls the duty of the current supplied to the LED channel 120 to be 100%.

The communication unit 160 enables data transmission and reception between components included in the electronic device 100. For example, when the processor 152 determines whether overvoltage is introduced, the communication unit 160 transmits the determination result to the LED controller 140. For example, the communication unit 160 transmits the duty to be output according to the judgment result of the processor 152 to the LED controller 140. Or, for example, the communication unit 160 transmits the input voltage that should be input according to the decision result of the processor 152 to the power supply unit 110.

Alternatively, the communication unit 160 transmits and receives data to and from an external server of the electronic device 100. For example, the communication unit 160 receives data about an image to be output through a display from an external server. Or, for example, when the processor 152 determines whether overvoltage has been introduced, the communication unit 160 transmits to an external server that overvoltage has been introduced.

Below, the components of such an electronic device will be described through circuit diagrams.

Figure 4 schematically shows a driving circuit of an electronic device according to embodiments.

As described in FIG. 3, the electronic device 100 according to embodiments includes a power supply unit 110, one or more LED channels 120, an LED controller 140 corresponding to the LED channel 120, and a voltage sensing device. Includes unit 150.

The electronic device 100 supplies voltage to the LED channel 120 through the third terminal J3 (eg, corresponding to J1 described in FIGS. 1 and 2) included in the power supply unit 110. At this time, the third terminal J3 electrically connects the external power source and the power supply unit 110 and is, for example, a wire or an element.

Although omitted in FIG. 4 , the electronic device 100 according to embodiments may further include a capacitor. The capacitor is, for example, a constant voltage output capacitor. The capacitor maintains the voltage input through the power supply unit 110 constant.

The LED channel 120 emits light through the voltage supplied from the power supply unit 110. LED channel 120 includes one or more LED elements (eg, L4, L5, L6). When one LED channel 120 includes a plurality of LED elements, each of the plurality of LED elements (eg, L4, L5, L6) is connected to each other in series. The LED channel 120 emits light through one or more LED elements (eg, L4, L5, L6). At this time, the number of LED elements included in the LED channel 120 is not limited to three, and may be one or more.

In addition, in FIG. 4, only one LED channel 120 is shown for convenience of explanation, but the number of LED channels 120 may be one or more. When the number of LED channels 120 is plural, each LED channel 120 is connected to each other in parallel, for example. When the number of LED channels 120 is plural, each of the plurality of LED channels corresponds to an LED controller 140. Accordingly, the electronic device 100 includes as many LED controllers 140 as the number of LED channels 120.

The LED controller 140 controls the driving of the LED channel 120. The LED controller 140 controls the driving of the LED channel 120 by adjusting the amount of current flowing into the LED channel 120. For example, the LED controller 140 controls one or more LED elements (eg, L4, L5, L6) included in the LED channel 120 to be turned on/off.

The voltage sensing unit 150 senses the voltage supplied to the LED channel 120 from the power supply unit 110. For this purpose, the voltage sensing unit 150 is connected in parallel with the LED channel 120. When the electronic device 100 includes a plurality of LED channels 120, the voltage sensing unit 150 is connected to each of the plurality of LED channels 120 in parallel. Through this, the voltage sensing unit 150 senses the voltage supplied to each LED channel 120.

The voltage sensing unit 150 includes a fifth terminal (J5) to sense the voltage supplied to the LED channel 120. The fifth terminal (J5) is connected in parallel to each of one or more LED channels 120 and senses the input voltage.

The voltage sensing unit 150 includes a third resistor (R3) and a fourth resistor (R4) to sense the input voltage through the fifth terminal (J5). At this time, for example, the third resistance (R3) is smaller than the fourth resistance (R4). As shown in FIG. 4, the third resistor (R3) and the fourth resistor (R4) are connected in parallel with each other. The third resistor (R3) and the fourth resistor (R4) are connected in parallel with the LED channel 120. The voltage sensing unit 150 further includes a second ground power source (X2) connected in series with the third resistor (R3) and the fourth resistor (R4).

The fifth terminal (J5) is located between the third resistor (R3) and the fourth resistor (R4). Through this terminal, the fifth terminal (J5) measures the output pressure, which is the pressure output to the fifth terminal (J5).

The voltage sensing unit 150 senses changes in output pressure. At this time, changes in output pressure may occur due to the introduction of overvoltage. Accordingly, the voltage sensing unit 150 determines that the output pressure is out of a normal state when it is outside the preset range. That is, the voltage sensing unit 150 determines that it is in an abnormal state when the output pressure is outside the preset range.

For example, the incoming voltage flowing through the third terminal (J3) is 10V. In a normal state, each LED element (L4, L5, L6) included in the LED channel 120 each consumes a voltage of 3V. In this case, 9V of the incoming voltage is consumed in the LED channel 120, and the remaining 1V voltage flows into the LED controller 140 through the fourth terminal (J4) included in the LED controller 140.

At this time, the electronic device 100 according to embodiments senses the incoming voltage through the fifth terminal J5 included in the voltage sensing unit 150. For example, the third resistor R3 and fourth resistor R4 are 10 kΩ and 100 kΩ, respectively. In the third resistor (R3) and fourth resistor (R4) connected in series with each other, the fifth terminal (J5) measures the voltage applied to the third resistor (R3) that changes according to the incoming voltage.

For example, the incoming voltage flowing through the third terminal (J3) is 10V. The fifth terminal (J5) measures approximately 0.91V, which is 1/11 of 10V. For example, 0.91V is a value less than the preset value described in FIG. 3. In this case, the processor 152 determines that the incoming voltage is in a normal state. That is, the processor 152 determines that the voltage of 1V flowing into the fourth terminal J4 is in a normal state.

Or, for example, the incoming voltage flowing through the third terminal J3 is 15V or more. The fifth terminal (J5) measures 1/11 of 15V or more, or about 1.36V or more. For example, 1.36V is a value greater than the preset value described in FIG. 3. In this case, the processor 152 determines that the incoming voltage is abnormal. That is, the processor 152 determines that the voltage of 6V flowing into the fourth terminal J4 is abnormal and is an overvoltage state.

When the processor 152 determines that the voltage flowing into the LED controller 140 is greater than or equal to a preset value, the processor 152 controls the amount of current supplied to the LED channel 120 to be less than or equal to a predetermined level. The electronic device 100 according to embodiments prevents the LED element from being damaged by driving the LED channel 120 at a low current.

In this way, the processor 152 controls the LED channel 120 to continue to be driven without being turned off in an overvoltage state. As the LED channel 120 continues to be driven in the on state, it consumes at least a portion of the voltage introduced through the third terminal J3.

For example, the incoming voltage flowing through the third terminal (J3) is 15V or more. When the LED channel 120 is in an off state, an overvoltage of 15V or more flows into the LED controller 140 through the fourth terminal (J4). In this case, the LED controller 140 may be damaged by overvoltage.

However, when the LED channel 120 continues to be in the on state, each LED element (L4, L5, L6) included in the LED channel 120 each consumes a voltage of 3V. In this case, 9V of the incoming voltage is consumed in the LED channel 120, and the remaining voltage of 6V or more flows into the LED controller 140 through the fourth terminal (J4) included in the LED controller 140. That is, as the LED channel 120 is driven at 100% duty and continues to be in the on state, embodiments can reduce the amount of voltage flowing into the LED controller 140.

In this way, as the LED channel 120 continues to be driven in the on state rather than in the overvoltage state, the electronic device 100 according to embodiments may operate the LED channel 120 and/ Alternatively, the LED controller 140 is prevented from being damaged by overvoltage.

Additionally, embodiments may detect all abnormal states of one or more LED channels 120 through one voltage sensing unit 150. Through this, the electronic device 100 according to the embodiments does not require a separate overvoltage inflow prevention circuit and PCB space on which such a circuit is mounted even if the number of LED channels 120 increases. Accordingly, embodiments can effectively arrange the driving circuit even when the number of LED channels 120 is large.

Hereinafter, a method for controlling an electronic device according to these embodiments will be described in detail.

5 is a flowchart explaining a method of controlling an electronic device according to embodiments.

The control method of the electronic device 100 according to embodiments includes sensing an input voltage (s101).

The voltage sensing unit 150 senses the input voltage through the sensor 151. As described in FIGS. 3 and 4 , the sensor 151 senses the input voltage through two resistors (eg, the third resistor and the fourth resistor described in FIG. 4 ) connected in series. For example, two resistors connected in series divide the input voltage. The sensor 151 senses the divided voltage. The processor 152 sets a threshold value based on the magnitude of the divided voltage. The threshold includes, for example, preset values described in FIGS. 1 to 4. The processor 152 may calculate the input voltage flowing into the electronic device 100 through the sensed input voltage. In this specification, for convenience of explanation, setting a threshold value, a preset value, etc. according to the calculated input voltage is explained as an example.

The control method of the electronic device 100 according to embodiments includes determining whether the input voltage is in an abnormal state (s102).

The processor 152 determines whether an abnormal state exists based on whether the sensed input voltage is greater than or equal to a threshold. For example, the processor 152 determines that the input voltage is abnormal if the sensed input voltage is greater than or equal to the threshold. The abnormal state includes the overvoltage state described above. For example, if the sensed input voltage is less than the threshold, the processor 152 determines that the input voltage is not in an abnormal state.

The control method of the electronic device 100 according to embodiments includes controlling the LED channel 120 to be driven according to a signal when it is determined that the input voltage is not in an abnormal state (s103).

In a normal state, the processor 152 controls the LED controller 140 to output duty according to a signal from the LED channel 120. In this case, the LED channel 120 is driven with a duty range of 0% to 100%. For example, the LED controller 140 controls the duty of the LED channel 120 based on signals included in the image to be output.

The control method of the electronic device 100 according to embodiments includes a step (s104) of driving the section of the LED channel 120 in which the abnormal state is sensed to have a duty of 100% when it is determined that the input voltage is in an abnormal state.

In an abnormal state, the processor 152 controls the LED controller 140 to output the duty of the LED channel 120 at 100%. That is, the processor 152 keeps the LED channel 120 in the on state in case of an abnormal state. Additionally, the processor 152 uses the LED controller 140 to drive the LED channel 120 at a low current of a predetermined size or less. At this time, the processor 152 sets a low current standard based on the internal and external temperature of the electronic device 100. Alternatively, the standard for low current is a value previously stored in memory (not shown). Alternatively, the standard for low current is received through the communication unit 160. Through this, the electronic device 100 according to embodiments prevents the LED channel 120 and/or the LED controller 140 from being damaged due to an abnormal condition.

Below, a method for controlling such an abnormal state will be described in more detail.

FIG. 6 is a flowchart explaining an example of a control method for s102 in FIG. 5.

The control method of the electronic device 100 according to embodiments includes sensing an input voltage (s101). The detailed description of s101 is the same or similar to that described in FIG. 5.

The control method of the electronic device 100 according to embodiments includes determining whether the input voltage is greater than or equal to the first voltage (s201).

The processor 152 determines whether the input voltage is greater than or equal to the first voltage. At this time, the first voltage is set based on the limit voltage. For example, the first voltage is 80% of the limit voltage. The first voltage is not limited to this, but may be a value lower than the second voltage, which will be described later. The preset value described in FIGS. 3 to 5 includes the first voltage.

Meanwhile, the processor 152 sets the limit voltage according to the number of LED elements included in each LED channel 120. Alternatively, the processor 152 sets the limit voltage using a value previously stored in memory. Alternatively, the processor 152 receives the limit voltage through the communication unit 160. At this time, the limit voltage is the maximum value of the input voltage that can be protected by the low current driving state described in FIGS. 3 to 5.

The control method of the electronic device 100 according to embodiments includes controlling the LED channel 120 to be driven according to a signal when it is determined that the input voltage is less than the first voltage (s103). The detailed description of s103 is the same or similar to that described in FIG. 5.

The control method of the electronic device 100 according to embodiments includes performing feedback control when it is determined that the input voltage is higher than the first voltage (s202).

If the input voltage is higher than the first voltage, the processor 152 requests feedback control from the power supply unit 110. Feedback control is, for example, a voltage control request that requests the power supply unit 110 to adjust the voltage in order to return an abnormal state to a normal state. For example, if the input voltage is higher than the first voltage, the processor 152 transmits a request to increase the feedback voltage to the power supply unit 110.

Through this, the electronic device 100 according to embodiments prevents the input voltage from rising to the overvoltage section.

The control method of the electronic device 100 according to embodiments includes determining whether the input voltage is higher than the second voltage (s203).

After feedback control, the processor 152 re-senses the input voltage supplied through the power supply unit 110 through a sensor. The processor 152 determines whether the re-sensed input voltage is higher than the second voltage. At this time, the second voltage is set based on the limit voltage. For example, the second voltage is 90% of the limit voltage. The value of the second voltage is not limited to this, and may be any value less than 100% of the limit voltage. The preset value described in FIGS. 3 to 5 includes the second voltage. The second voltage is a value greater than the first voltage. The second voltage is a voltage when the input voltage does not decrease below the first voltage even by the feedback control (s202). The processor 152 determines that the LED channel 120 corresponds to an overvoltage section when the input voltage is higher than the second voltage.

The control method of the electronic device 100 according to embodiments includes the step (s104) of driving the section of the LED channel 120 in which the abnormal voltage is sensed to have a duty of 100% when it is determined that the input voltage is higher than the second voltage. do. The detailed description of s104 is the same or similar to that described in FIG. 5.

If the processor 152 determines that the input voltage is higher than the second voltage, it continues to perform step s202 while performing step s104. That is, the processor 152 controls the LED channel 120 to be driven at a low current while continuously being turned on, and requests feedback control from the power supply unit 110. Through this, the electronic device 100 according to embodiments allows the LED channel 120 and the LED controller 140 to be more effectively protected.

Meanwhile, if the processor 152 determines that the input voltage re-sensed through the sensor 151 is less than the second voltage, the processor 152 determines again whether the re-sensed input voltage is greater than the first voltage (s201). At this time, if the re-sensed input voltage is less than the first voltage, the processor 152 controls the LED controller 140 to output duty according to the signal to the LED channel 120 (s103). If the re-sensed input voltage is higher than the first voltage, the processor 152 performs feedback control (s202).

As such, the electronic device 100 according to embodiments performs low current driving in the on state to prevent overvoltage as described above before the input voltage reaches 100% of the limit voltage. Accordingly, embodiments prevent the display from suddenly turning off due to overvoltage. Additionally, the electronic device 100 according to embodiments provides efficiently arranged elements and/or driving circuits. Additionally, the embodiments seek to reduce production costs by reducing the area of required devices and PCBs. Additionally, embodiments prevent overvoltage from flowing into each LED channel. In addition, the embodiments implement different driving operations for each incoming voltage in an abnormal state to simultaneously prevent overvoltage inflow and protect the electronic device and the user.

FIG. 7 shows a voltage driving mode according to FIGS. 3 to 6.

FIG. 7 shows the magnitude of voltage over time in the electronic device 100 described in FIGS. 3 to 6 .

7 to 10 indicate the input voltage to the LED channel 120 described in FIGS. 3 to 6. That is, the input voltage 10 represents the voltage of the third terminal J3. At this time, the third terminal J3 electrically connects the external power source and the power supply unit 110 and is, for example, a wire or an element.

In addition, 11 in FIGS. 7 is the voltage measured by the LED controller 140 described in FIGS. 3 to 6 and represents the input voltage flowing into the LED controller 140. The incoming voltage 11 is, for example, a voltage measured at the fourth terminal J4 included in the LED controller 140. At this time, the fourth terminal J4 electrically connects the LED channel 120 and the LED controller 140 and is, for example, a wire or an element.

In Figure 7, S represents driving in a steady state. Additionally, in FIG. 7, U represents driving in an abnormal state. The normal state (S) is a state in which power having a magnitude within a certain range is constantly supplied from an external power source to the power supply unit 110. For example, in the normal state (S), the electronic device 100 is driven by the supplied power without damage to elements and/or circuits within the electronic device 100. An abnormal state (U) is, for example, a case where a voltage exceeding a preset value is introduced. The abnormal state (U) is, for example, a problem occurring in the third terminal (J3, see FIG. 1) connecting the external power source and the power supply unit 110. The abnormal state (U) includes, for example, a case where the third terminal J3 or the external wire connected to the third terminal J3 is peeled off and the inside of the terminal or external wire touches the ground.

In the steady state (S) shown in FIG. 7, the input voltage 10 is constantly supplied to the LED channel 120. For example, the input voltage 10 is supplied to the LED channel 120 at a level less than a preset value. Accordingly, the incoming voltage 11 flows into the LED controller 140 within a preset range.

In the abnormal state (U) shown in FIG. 7, the input voltage 10 is supplied irregularly to the LED channel 120. For example, the input voltage 10 is supplied to the LED channel 120 at a level greater than a preset value.

When the processor 152 determines that the input voltage is in an abnormal state (U), it controls the LED channel 120 to be driven at 100% duty. That is, as shown in FIG. 7, the LED channel 120 maintains the on state without turning off in the abnormal state (U) (11). Additionally, the LED channel 120 is driven with low current in an abnormal state (U).

Accordingly, the maximum value (V2) of the input voltage shown in FIG. 7 is smaller than the maximum value (V1) of the input voltage shown in FIG. 2. Through this, it can be seen that the electronic device 100 according to the embodiments reduces the magnitude of the maximum voltage flowing into the LED controller 140. That is, the electronic device 100 according to embodiments more effectively protects the LED controller 140 from overvoltage by reducing the overvoltage flowing into the LED controller 140 through continuous low-current driving.

In addition, the electronic device 100 according to embodiments prevents the LED controller 140 from being damaged in such an abnormal state, thereby more effectively protecting the user using the electronic device 100.

Although the electronic device and the control method of the electronic device according to the embodiments of the present invention have been described above as specific embodiments, this is only an example and the present invention is not limited thereto, and is limited to the widest scope according to the basic idea disclosed in the present specification. It should be interpreted as having.

A person skilled in the art may combine and substitute the disclosed embodiments to implement embodiments not specified, but this also does not deviate from the scope of the present invention. In addition, a person skilled in the art can easily change or modify the embodiments disclosed based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

100: electronic device
110: power supply unit
120: LED Channel (Light Emitting Diode Channel)
140: LED Controller
150: Voltage sensing unit
160: Department of Communications

Claims (12)

A sensor that senses the input voltage supplied from the power supply unit; and
If the sensed input voltage is higher than the first voltage, a processor that controls the duty of the current supplied to one or more LEDs (Light Emitting Diodes) to be 100%;
Including,
Electronic devices. According to claim 1,
The processor,
If the sensed input voltage is higher than the first voltage, the amount of current supplied to the one or more LEDs is controlled to be less than a predetermined amount,
Electronic devices. According to claim 1,
The processor,
If the sensed input voltage is greater than or equal to a second voltage that is less than the first voltage, a request to increase the feedback voltage is transmitted to the power supply unit.
Electronic devices. According to claim 3,
The processor,
After controlling the current supplied to one or more LEDs, the input voltage supplied through the power supply is re-sensed through the sensor, and if the re-sensed input voltage is less than the second voltage, the one or more LEDs So that the current supplied to is driven according to the signal,
Electronic devices. According to claim 1,
The sensor is,
Connected in parallel with each of the one or more LEDs,
Electronic devices. According to claim 1,
The sensor is,
Sensing the voltage divided by a first resistor and a second resistor connected in series with each other,
Electronic devices. According to claim 1,
The first voltage is,
More than 90% of the preset limit voltage for the one or more LEDs,
Electronic devices. sensing an input voltage; and
If the sensed input voltage is higher than the first voltage, controlling the duty of the current supplied to one or more LEDs to be 100%;
Including,
How to control electronic devices. According to claim 8,
The step of sensing the input voltage is,
dividing the input voltage by a first resistor and a second resistor connected in series with each other; and
sensing the divided voltage;
Including,
How to control electronic devices. According to claim 8,
If the sensed input voltage is greater than the second voltage and less than the first voltage, transmitting a request to increase the feedback voltage for the input voltage, where the second voltage is less than the first voltage;
Including,
How to control electronic devices. According to claim 10,
If the sensed input voltage is less than the second voltage, driving a current supplied to the one or more LEDs according to a signal;
Including,
How to control electronic devices. According to claim 8,
If the sensed input voltage is greater than or equal to a first voltage, transmitting a feedback voltage increase request for the input voltage; Including,
How to control electronic devices.

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