KR20210011293A - Display device - Google Patents

Abstract

A display device includes: a power supply unit; a display; a control unit for controlling the power supply unit and the display; and a power management unit connected between the display and the control unit to control the power supply of the power supply unit according to a BDP signal from the display, wherein when the BDP signal is an abnormal signal, the power management unit may output a power-off signal to the control unit after a predetermined time has elapsed. The present invention provides the display device capable of cutting-off power only in case of failure.

Description

Display device

The present invention relates to a display device, and more particularly, to a display device capable of preventing a power cut off failure due to a malfunction.

In recent years, the types of display devices are increasing. Among them, organic light emitting diode displays (hereinafter referred to as OLED displays) are widely used.

Since the OLED display device is a self-luminous device, compared to a liquid crystal display device requiring a backlight, power consumption is low and has an advantage that it can be manufactured thin. In addition, the OLED display device has a wide viewing angle and a fast response speed.

On the other hand, in the OLED display device, when an overcurrent flows through the panel, the pixels are butn-in, causing panel defects, and the power is cut off to prevent such defects.

In a conventional OLED display device, power is cut off even though a panel malfunction occurs. For example, when noise is introduced into the power supplied to the panel or in a country where power supply is unstable, a momentary fluctuation of power supplied to the panel occurs. Such an instantaneous malfunction is temporary and can be immediately normalized, and the power should not be cut off when such a malfunction occurs.

However, in a conventional OLED display device, there is a problem that power is cut off even in an instantaneous malfunction.

The present invention provides a display device capable of cutting off power only for a substantial failure.

The present invention provides a display device capable of not turning off power in a momentary malfunction.

According to an embodiment of the present invention, a display device includes: a power supply unit; display; A control unit for controlling the power supply and the display; And a power management unit connected between the display and the control unit to control power supply of the power supply unit according to the BDP signal from the display. When the BDP signal is an abnormal signal, the power management unit may output a power-off signal to the control unit after a predetermined time elapses.

According to an embodiment of the present invention, even if an abnormal signal is received, the power supply is not immediately cut off from the power supply unit, but a signal is sent to the control unit after waiting or delaying for a certain period of time so that the power is cut off. There is an advantage in that it is possible to improve the reliability of the product by not being blocked, and to prevent customer complaints due to product defects in advance.

1 is a diagram illustrating an image display device according to an embodiment of the present invention.
2 is an example of an internal block diagram of the image display device of FIG. 1.
3 is an internal block diagram of the display of FIG. 2.
4A to 4B are views referenced for explanation of the organic light emitting panel of FIG. 3.
5 is a circuit diagram of a power management unit according to a first embodiment of the present invention
6 shows power management in a conventional display device.
7 shows power management in the power management unit according to the first embodiment of the present invention.
8 shows power management when an instantaneous malfunction occurs in the power management unit according to the first embodiment of the present invention.
9 is a circuit diagram of a power management unit according to a second embodiment of the present invention
10 shows power management in the power management unit according to the second embodiment of the present invention.
11 shows power management when an instantaneous malfunction occurs in the power management unit according to the second embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffixes "module" and "unit" for the constituent elements used in the following description are given in consideration of only the ease of writing in the present specification, and do not impart a particularly important meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably with each other.

1 is a diagram illustrating an image display device according to an embodiment of the present invention.

Referring to the drawings, the image display device 100 may include a display 180.

Meanwhile, the display 180 may be implemented with any one of various panels. For example, the display 180 may be any one of a liquid crystal display panel (LCD panel), an organic light emitting panel (OLED panel), an inorganic light emitting panel (LED panel), and the like.

In the present invention, the display 180 may include an organic light emitting panel (OLED panel).

Meanwhile, the image display device 100 of FIG. 1 may be a monitor, a TV, a tablet PC, or a mobile terminal.

2 is an example of an internal block diagram of the image display device of FIG. 1.

Referring to FIG. 2, the image display device 100 according to an embodiment of the present invention includes a power management unit 160, a broadcast reception unit 105, an external device interface unit 130, a storage unit 140, and a user input. An interface unit 150, a sensor unit (not shown), a control unit 170, a display 180, an audio output unit 185, and a power supply unit 190 may be included.

Even when an abnormal signal, such as a temporary malfunction signal, is received, the power management unit 160 does not immediately cut off the power of the power supply unit 190 and delays the blocking of the power supply unit 190 for a certain period of time, thereby coping with an instantaneous malfunction.

The power management unit 160 may be connected between the display 180 and the controller 170. The power management unit 160 may receive a normal signal or an abnormal signal from the display 180.

The normal signal means that the display is normally driven, and may mean that, for example, overcurrent does not flow in the pixel. The abnormal signal may mean, for example, an overcurrent flowing through the pixel. The abnormal signal may include not only an overcurrent flowing through the pixel, but also an instantaneous malfunction. The instantaneous malfunction may mean, for example, a state in which noise is introduced into the power source or the power supplied to the panel is instantaneously changed and the panel is not normally driven.

These normal and abnormal signals may be included in the Burnt Detection Protection (BDP) signal. The BDP signal may be information on the presence or absence of an abnormality in the display 180. For example, a high-level BDP signal may mean a normal signal, and a low-level BDP signal may mean an abnormal signal, but may have an opposite level.

The BDP signal can be generated in the following situations.

-RT detection overcurrent detection

-Overcurrent detection when power is on

-Overcurrent detection when off-RS

-Overcurrent detection according to gate low voltage (VGL)/gate high voltage (VGH)

-EPI lock check

Accordingly, when the panel is normally driven, the power management unit 160 may receive a high level BDP signal. When the panel is abnormally driven, the power management unit 160 may receive a low level BDP signal.

When receiving the low-level BDP signal, the power management unit 160 may transmit the signal to the control unit 170 after a predetermined time elapses. In this case, the controller may control the power supply unit 190 to cut off power in response to the corresponding signal. Since power of the power supply unit 190 is cut off, operation of components of the display apparatus 100 receiving power from the power supply unit 190 may also be stopped. For example, some of the constituent elements of the display apparatus 100, such as the broadcast receiving unit 105 or the user input interface unit 150, may be operated by continuously supplying power.

Accordingly, according to the embodiment, even if an abnormal signal is received, the power supply to the power supply unit 190 is not immediately cut off, but waits or delays for a certain period of time, and then the signal is sent to the control unit 170 so that the power is cut off at that time, In case of instantaneous malfunction, the power is not cut off, thereby improving the reliability of the product and preventing customer complaints due to product defects in advance.

The power management unit 160 will be described in detail later with reference to FIGS. 5 to 11.

The broadcast reception unit 105 may include a tuner unit 110, a demodulation unit 120, a network interface unit 135, and an external device interface unit 130.

Meanwhile, unlike the drawings, the broadcast reception unit 105 may include only the tuner unit 110, the demodulation unit 120, and the external device interface unit 130. That is, the network interface unit 135 may not be included.

The tuner 110 selects a channel selected by a user from among radio frequency (RF) broadcast signals received through an antenna (not shown) or an RF broadcast signal corresponding to all pre-stored channels. Also, the selected RF broadcast signal is converted into an intermediate frequency signal or a baseband video or audio signal.

For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted into a digital IF signal (DIF), and if an analog broadcast signal is converted into an analog baseband video or audio signal (CVBS/SIF). That is, the tuner unit 110 may process a digital broadcast signal or an analog broadcast signal. The analog baseband video or audio signal (CVBS/SIF) output from the tuner 110 may be directly input to the control unit 170.

Meanwhile, the tuner unit 110 may include a plurality of tuners in order to receive broadcast signals of a plurality of channels. Alternatively, a single tuner that simultaneously receives broadcast signals of multiple channels is possible.

The demodulation unit 120 receives the digital IF signal DIF converted by the tuner unit 110 and performs a demodulation operation.

The demodulator 120 may output a stream signal TS after performing demodulation and channel decoding. In this case, the stream signal may be a signal in which a video signal, an audio signal, or a data signal is multiplexed.

The stream signal output from the demodulator 120 may be input to the controller 170. After performing demultiplexing, image/audio signal processing, and the like, the controller 170 outputs an image to the display 180 and outputs an audio to the audio output unit 185.

The external device interface unit 130 may transmit or receive a connected external device (not shown), for example, a set-top box and data. To this end, the external device interface unit 130 may include an A/V input/output unit (not shown).

The external device interface unit 130 may be connected to an external device such as a digital versatile disk (DVD), a blu ray, a game device, a camera, a camcorder, a computer (laptop), a set-top box, etc. by wire/wireless. , It is also possible to perform input/output operations with external devices.

The A/V input/output unit may receive video and audio signals from an external device. Meanwhile, a wireless communication unit (not shown) may perform short-range wireless communication with another electronic device.

Through such a wireless communication unit (not shown), the external device interface unit 130 may exchange data with an adjacent mobile terminal (not shown). In particular, in the mirroring mode, the external device interface unit 130 may receive device information, executed application information, application image, and the like from a mobile terminal (not shown).

The network interface unit 135 provides an interface for connecting the image display device 100 to a wired/wireless network including an Internet network. For example, the network interface unit 135 may receive content or data provided by the Internet or a content provider or a network operator through a network.

Meanwhile, the network interface unit 135 may include a wireless communication unit (not shown).

The storage unit 140 may store a program for processing and controlling each signal in the control unit 170 or may store a signal-processed video, audio, or data signal.

In addition, the storage unit 140 may perform a function for temporary storage of a video, audio, or data signal input to the external device interface unit 130. In addition, the storage unit 140 may store information on a predetermined broadcast channel through a channel storage function such as a channel map.

2 illustrates an embodiment in which the storage unit 140 is provided separately from the control unit 170, but the scope of the present invention is not limited thereto. The storage unit 140 may be included in the control unit 170.

The user input interface unit 150 transmits a signal input by the user to the controller 170 or transmits a signal from the controller 170 to the user.

For example, the remote control device 200 transmits/receives user input signals such as power on/off, channel selection, and screen setting, or local keys such as power key, channel key, volume key, and set value (not shown) A user input signal input from the controller 170 is transmitted to the controller 170, or a user input signal input from a sensor unit (not shown) that senses a user's gesture is transmitted to the controller 170, or a signal from the controller 170 is transmitted. It can be transmitted to the sensor unit (not shown).

The control unit 170, through the tuner unit 110, the demodulation unit 120, the network interface unit 135, or the external device interface unit 130, demultiplexes the input stream or processes the demultiplexed signals. , It is possible to generate and output a signal for video or audio output.

The image signal processed by the controller 170 may be input to the display 180 and displayed as an image corresponding to the corresponding image signal. Also, the image signal processed by the controller 170 may be input to an external output device through the external device interface unit 130.

The audio signal processed by the controller 170 may be sound output to the audio output unit 185. In addition, the voice signal processed by the control unit 170 may be input to an external output device through the external device interface unit 130.

Although not shown in FIG. 2, the control unit 170 may include a demultiplexer, an image processing unit, and the like. This will be described later with reference to FIG. 3.

In addition, the controller 170 may control the overall operation of the image display apparatus 100. For example, the control unit 170 may control the tuner unit 110 to select (Tuning) an RF broadcast corresponding to a channel selected by a user or a pre-stored channel.

In addition, the controller 170 may control the image display apparatus 100 by a user command or an internal program input through the user input interface unit 150.

Meanwhile, the controller 170 may control the display 180 to display an image. In this case, the image displayed on the display 180 may be a still image or a moving image, and may be a 2D image or a 3D image.

Meanwhile, the controller 170 may allow a predetermined object to be displayed in an image displayed on the display 180. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), EPG (Electronic Program Guide), various menus, widgets, icons, still images, moving pictures, and text.

Meanwhile, the controller 170 may recognize a user's location based on an image captured by a photographing unit (not shown). For example, a distance (z-axis coordinate) between the user and the image display device 100 may be determined. In addition, the x-axis coordinates and the y-axis coordinates in the display 180 corresponding to the user's location may be identified.

The display 180 converts an image signal, a data signal, an OSD signal, a control signal, or an image signal, a data signal, a control signal received from the external device interface unit 130, etc. processed by the controller 170 to convert a driving signal. Generate.

Meanwhile, the display 180 may be configured as a touch screen and used as an input device other than an output device.

The audio output unit 185 receives a signal processed by the control unit 170 and outputs it as a voice.

The photographing unit (not shown) photographs the user. The photographing unit (not shown) may be implemented with one camera, but is not limited thereto, and may be implemented with a plurality of cameras. Image information captured by the photographing unit (not shown) may be input to the control unit 170.

The controller 170 may detect a user's gesture based on an image captured from a photographing unit (not shown) or a signal sensed from a sensor unit (not shown), or a combination thereof.

The power supply unit 190 supplies corresponding power throughout the image display device 100. In particular, power can be supplied to the control unit 170 that can be implemented in the form of a System On Chip (SOC), the display 180 for displaying an image, and the audio output unit 185 for outputting audio. have.

Specifically, the power supply unit 190 may include a converter that converts AC power to DC power and a dc/dc converter that converts the level of DC power.

The remote control device 200 transmits a user input to the user input interface unit 150. To this end, the remote control device 200 may use Bluetooth, Radio Frequency (RF) communication, infrared (IR) communication, Ultra Wideband (UWB), ZigBee, or the like. In addition, the remote control device 200 may receive an image, audio, or data signal output from the user input interface unit 150 and display it on the remote control device 200 or output an audio signal.

Meanwhile, the above-described image display device 100 may be a digital broadcast receiver capable of receiving a fixed or mobile digital broadcast.

Meanwhile, a block diagram of the image display device 100 shown in FIG. 2 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted according to the specifications of the image display device 100 that is actually implemented. That is, if necessary, two or more components may be combined into a single component, or one component may be subdivided into two or more components and configured. In addition, the functions performed by each block are for explaining the embodiments of the present invention, and specific operations or devices thereof do not limit the scope of the present invention.

3 is an internal block diagram of the display of FIG. 2.

Referring to the drawings, an organic light emitting panel-based display 180 includes an organic light emitting panel 210, a first interface unit 230, a second interface unit 231, a timing controller 232, and a gate driver 234. , A data driver 236, a memory 240, a processor 270, a power supply unit 290, a current detection unit 1110, and the like.

The display 180 may receive an image signal Vd, a first DC power supply V1 and a second DC power supply V2, and display a predetermined image based on the image signal Vd.

Meanwhile, the first interface unit 230 in the display 180 may receive an image signal Vd and a first DC power V1 from the control unit 170.

Here, the first DC power V1 may be used for the operation of the power supply unit 290 and the timing controller 232 in the display 180.

Next, the second interface unit 231 may receive the second DC power V2 from the external power supply unit 190. Meanwhile, the second DC power V2 may be input to the data driver 236 in the display 180.

The timing controller 232 may output a data driving signal Sda and a gate driving signal Sga based on the image signal Vd.

For example, when the first interface unit 230 converts the input video signal Vd to output the converted video signal Va1, the timing controller 232 may be based on the converted video signal Va1. Thus, the data driving signal Sda and the gate driving signal Sga may be output.

In addition to the video signal Vd from the controller 170, the timing controller 232 may further receive a control signal, a vertical synchronization signal Vsync, and the like.

Further, the timing controller 232 includes a gate driving signal Sga and data for the operation of the gate driver 234 based on a control signal, a vertical synchronization signal Vsync, etc. in addition to the video signal Vd. A data driving signal Sda for the operation of the driver 236 may be output.

In this case, the data driving signal Sda may be a data driving signal for driving an RGBW subpixel when the panel 210 includes an RGBW subpixel.

Meanwhile, the timing controller 232 may further output a control signal Cs to the gate driver 234.

The gate driving unit 234 and the data driving unit 236 are respectively provided through a gate line GL and a data line DL according to a gate driving signal Sga and a data driving signal Sda from the timing controller 232. , A scanning signal and an image signal are supplied to the organic light emitting panel 210. Accordingly, the organic light emitting panel 210 displays a predetermined image.

Meanwhile, the organic light-emitting panel 210 may include an organic light-emitting layer, and in order to display an image, a plurality of gate lines GL and data lines DL are provided in a matrix form in each pixel corresponding to the organic light-emitting layer. Can be placed in cross.

Meanwhile, the data driver 236 may output a data signal to the organic light emitting panel 210 based on the second DC power V2 from the second interface unit 231.

The power supply unit 290 may supply various types of power to the gate driver 234, the data driver 236, the timing controller 232, and the like.

The current detector 1110 may detect a current flowing through the subpixels of the organic light emitting panel 210. The detected current may be input to the processor 270 or the like for calculating the accumulated current.

The processor 270 may perform various types of controls within the display 180. For example, the gate driver 234, the data driver 236, and the timing controller 232 may be controlled.

Meanwhile, the processor 270 may receive current information flowing through the subpixels of the organic light emitting panel 210 from the current detector 1110.

Further, the processor 270 may calculate an accumulated current of the subpixels of each organic light emitting panel 210 based on current information flowing through the subpixels of the organic light emitting panel 210. The calculated accumulated current may be stored in the memory 240.

Meanwhile, the processor 270 may determine that the accumulated current of the subpixels of each organic light emitting panel 210 is greater than or equal to the allowable value as burn-in.

For example, when the cumulative current of the subpixels of each organic light emitting panel 210 is 300000 A or more, the processor 270 may determine that the subpixel is burned in.

Meanwhile, when the cumulative current of some of the subpixels of each organic light emitting panel 210 approaches an allowable value, the processor 270 may determine the corresponding subpixel as a subpixel for which burn-in is predicted.

Meanwhile, the processor 270 may determine the subpixel having the largest accumulated current as the burn-in prediction subpixel, based on the current detected by the current detector 1110.

4A to 4B are views referenced for explanation of the organic light emitting panel of FIG. 3.

First, FIG. 4A is a diagram illustrating a pixel in the organic light emitting panel 210.

Referring to the drawings, the organic light emitting panel 210 includes a plurality of scan lines (Scan 1 to Scan n) and a plurality of data lines (R1, G1, B1, W1 to Rm, Gm, Bm, Wm) intersecting them. It can be provided.

Meanwhile, a pixel is defined in an area at which the scan line and the data line in the organic light emitting panel 210 cross each other. In the drawing, a pixel (Pixel) including subpixels (SP _r1 , SP _g1 , SP _b1 , SP _w1 ) of RGBW is shown.

FIG. 4B illustrates a circuit of any one sub-pixel in the pixel of the organic light emitting panel of FIG. 4A.

Referring to the drawings, an organic light emitting sub-pixel circuit (CRTm) is an active type, and includes a scan switching element (SW1), a storage capacitor (Cst), a driving switching element (SW2), and an organic light emitting layer (OLED). I can.

The scan switching element SW1 has a scan line connected to a gate terminal, and is turned on according to an input scan signal Vscan. When turned on, the input data signal Vdata is transmitted to the gate terminal of the driving switching element SW2 or one end of the storage capacitor Cst.

The storage capacitor Cst is formed between the gate terminal and the source terminal of the driving switching element SW2, a data signal level transmitted to one end of the storage capacitor Cst, and a direct current transmitted to the other end of the storage capacitor Cst. Stores a predetermined difference in the power supply (Vdd) level.

For example, when the data signal has different levels according to the PAM (Pluse Amplitude Modulation) method, the power level stored in the storage capacitor Cst varies according to the difference in the level of the data signal Vdata.

As another example, when the data signal has different pulse widths according to the PWM (Pluse Width Modulation) method, the power level stored in the storage capacitor Cst varies according to the difference in the pulse width of the data signal Vdata.

The driving switching element SW2 is turned on according to the power level stored in the storage capacitor Cst. When the driving switching element SW2 is turned on, the driving current I _OLED , proportional to the stored power level, flows in the organic light emitting layer OLED. Accordingly, the organic light emitting layer OLED performs a light emission operation.

The organic light emitting layer (OLED) includes a light emitting layer (EML) of RGBW corresponding to a subpixel, and at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL) It may include, and may also include a hole blocking layer in addition.

Meanwhile, the sub-pixels all output white light from the organic light emitting layer OLED, but in the case of green, red, and blue sub-pixels, a separate color filter is provided to implement colors. That is, in the case of green, red, and blue subpixels, green, red, and blue color filters are further provided. On the other hand, in the case of the white subpixel, since white light is output, a separate color filter is not required.

Meanwhile, in the drawing, as the scan switching element SW1 and the driving switching element SW2, a case of a p-type MOSFET is exemplified, but an n-type MOSFET or other switching elements such as JFET, IGBT, or SIC are illustrated. It is also possible to be used.

5 is a circuit diagram of a power management unit according to a first embodiment of the present invention

1 to 3 and 5, the power management unit 160 according to the first embodiment of the present invention may include a switching element 162 and a charge/discharge element 164.

The switching element 162 includes a FET transistor, but is not limited thereto. The switching element 162 may include a gate terminal connected to the display 180, a drain terminal connected to a supply voltage line, and a source terminal connected to the charging/discharging device 164.

The switching element 162 may receive a BDP signal from the display 180. That is, the display 180 may supply the BDP signal to the gate terminal of the switching element 162. The BDP signal may include a normal signal or an abnormal signal.

The normal signal may be a signal indicating that the display 180 is normally operated.

The abnormal signal may be a signal indicating that the display 180 does not operate normally. For example, when an overcurrent flows through a pixel of the display 180, it may be supplied to the switching element 162 as a BDP signal including an abnormal signal. For example, when the power supplied to the display 180 changes, an abnormal signal may be supplied to the switching element 162 as a BDP signal. For example, when a momentary malfunction occurs in the display 180, it may be supplied to the switching element 162 as a BDP signal including an abnormal signal. Here, when an overcurrent flows, since the pixels of the display 180 are burned-in, the power must be quickly cut off. However, an instantaneous malfunction or power fluctuation is temporary and is immediately restored to a normal state, so in this case, the power should not be cut off.

Conventionally, when an abnormal signal is received because a specific state of an abnormal signal cannot be identified, there is a problem of unconditionally turning off the power.

In the present invention, even if an abnormal signal is received, the power is not cut off immediately by monitoring the state of the display 180 for a certain period of time without turning off the power, and by turning off the power when an abnormal signal is received after a certain period of time has passed. Even in such a situation, it is possible to solve the problem by cutting off the power.

A first resistor R1 may be connected to a gate terminal of the switching element 162 and a second resistor R2 may be connected to a drain terminal of the switching element 162. The first resistor R1 and the second resistor R2 may prevent rapid application of current. The first and second resistors R1 and R2 may be formed naturally or may be installed as separate components.

One side of the charging/discharging element 164 may be connected to a source terminal of the switching element 162 and the other side may be grounded.

A node n is formed between the source terminal of the switching element 162 and one side of the charging/discharging element 164, and the control unit 170 may be connected to the node n. Accordingly, the voltage or signal formed at the node n may be supplied to the control unit 170. The voltage formed at the node n may be a voltage charged or discharged in the charging/discharging element 164.

For example, when the switching element 162 is turned on, a voltage corresponding to the supply voltage may be charged to the charging/discharging element 164 through the switching element 162, that is, the node n.

For example, when the switching element 162 is turned off, the supply voltage is no longer supplied to the charge/discharge element 164, and a discharge path may be formed between the charge/discharge element 164 and the control unit 170. In this case, the voltage charged to the node n may be supplied to the corresponding discharge path to be discharged.

Accordingly, when the switching element 162 is turned on, a high-level voltage is charged to the node n, and when the switching element 162 is turned off, the voltage of the node n may be discharged to a low-level voltage. . Here, the low level may be, for example, 0V or a voltage close thereto. For example, the low level may be a voltage of 20% or less compared to the high level. The low level may be 0V to 1, but for example, the low level may be 0V to 0.6V, but is not limited thereto. For example, the low level may be 0V to 0.3V.

The controller 170 may receive the voltage (or signal) of the node n between the switching element 162 and the charging/discharging element 164.

For example, when the voltage received from the node n is a normal signal, that is, a high level voltage, the control unit 170 may control the power supply unit 190 to maintain the power on state. For example, when the voltage received from the node n is an abnormal signal, that is, a voltage of a low level, the control valve may control the power supply unit 190 to cut off power.

For example, while the voltage of the node n is discharged from a high-level voltage to a low-level voltage, the control unit 170 may control the power supply unit 190 to maintain the power-on state without cutting off the power. For example, the control unit 170 controls the power supply unit 190 to maintain the power-on state when the voltage of the node (n) is changed from a high-level voltage to a low-level voltage when a malfunction is taken and changed to a normal state. can do. When the malfunction is corrected to change to a normal state, the switching element 162 receives a normal signal from the display 180, and the switching element 162 may be turned on by the normal signal. When the switching element 162 is turned on, since the charging/discharging element 164 is charged, the voltage of the node n is not discharged to a low level, but may be charged again to a high level.

A method of managing power will be described with reference to FIGS. 6 to 8.

6 shows power management in a conventional display device.

In a conventional display device, there is no power management unit 160 according to the first embodiment, and a BDP signal generated from the display is transmitted to the control unit 170 (FIG. 6A). Accordingly, the control unit 170 may maintain the power on when receiving the BDP signal corresponding to the normal signal, and cut off the power when receiving the BDP signal corresponding to the abnormal signal (FIG. 6B).

7 shows power management in the power management unit according to the first embodiment of the present invention. 7A shows a voltage charged or discharged to the node n, and FIG. 7B shows the power of the power supply.

According to the first embodiment of the present invention, the power management unit 160 may be connected between the display 180 and the control unit 170.

When the power management unit 160 receives the BDP signal corresponding to the normal signal, since it does not output the signal to the control unit 170, the control unit 170 can control the power supply unit 190 while maintaining the power on state. .

When the power management unit 160 receives the BDP signal corresponding to the abnormal signal, since it still does not output the signal for a predetermined time, that is, the first time T1, the control unit 170 provides the power supply unit ( 190) can be controlled. For example, a normal signal may have a high level, and an abnormal signal may have a low level. The switching element 162 of the power management unit is turned off by an abnormal signal to discharge the charge/discharge element 164, and the first time T1 is a node n between the switching element 162 and the charge/discharge element 164 There is a time when the voltage of) is discharged from the high level to the low level. The control unit 170 may control the power supply unit 190 to maintain the power-on state until the voltage of the node n reaches a low level.

When the first time T1 elapses, the control unit 170 may control the power supply unit 190 to receive a low-level voltage from the node n of the power management unit 160 and cut off the power at this time.

The first time T1 may be, for example, 15 ms to 20 ms. Overcurrent detection that generates the BDP signal may be performed by the IC inside the timing controller 232. That is, the timing controller 232 can turn off the IC itself by setting the OCP level, and since the time it takes to restart after IC off is approximately 15.5 ms, 30% of the design margin is applied to eliminate the One hour (T1) may be set.

8 shows power management when an instantaneous malfunction occurs in the power management unit according to the first embodiment of the present invention.

If an instantaneous malfunction is taken during the first time T1, that is, while the voltage of the node n is being discharged from a high level to a low level, the power management unit 160 may perform the display 180 A BDP signal corresponding to a normal signal can be received from. Since the power management unit 160 charges the charging/discharging element 164 by turning on the switching element 162 in response to a normal signal, the voltage of the node n may be charged again to a high level instead of being discharged to a low level. . Accordingly, since the control unit 170 does not receive a low-level voltage from the node n, it may control the power supply unit 190 to maintain the power on state. The time point P at which the malfunction is corrected may be located within the first time T1. Since the time point P at which the malfunction is corrected is located within the first time T1, the power management unit 160 can receive the normal signal instead of the abnormal signal from the display 180 at the time point P, and this normal signal Accordingly, even if the first time T1 elapses, the power is not cut off and the on state can be maintained. The width of the first time T1 may be adjusted so that the time point P at which the instantaneous malfunction is corrected is located within the first time T1.

According to the first embodiment, by connecting the node (n) of the power management unit to the control unit 170, even if an abnormal signal is received, the power supply is delayed until a certain time elapses, thereby instantaneous When a malfunction is taken, the power is not cut off to improve the reliability of the product, and customer complaints due to product defects can be prevented in advance.

9 is a circuit diagram of a power management unit according to a second embodiment of the present invention

1 to 3 and 9, the power management unit 160 according to the second embodiment of the present invention may include a switching element 162, a charge/discharge element 164, and a power cut-off control unit 166. have.

Since the switching element 162 and the charging/discharging element 164 have been described in the first embodiment, detailed descriptions are omitted.

The power cut-off control unit 166 may be connected between the control unit 170 and the node n between the switching element 162 and the charging/discharging element 164. Accordingly, the power cut-off controller 166 may output a predetermined signal to the controller 170 by inputting the voltage of the node n. For example, the predetermined signal may include a power off signal (see FIGS. 10B and 11B).

The power cut-off control unit 166 detects a discharge voltage discharged from the charging/discharging element 164, obtains whether the detected discharge voltage is less than a reference value Ref, as shown in FIG. 10, and the discharge voltage is If it is smaller than the reference value Ref, the power-off signal may be output to the controller 170. For example, the control unit 170 may control the power supply unit 190 to cut off power when receiving a power-off signal from the power cut-off control unit 166. For example, when the control unit 170 receives a power-on signal from the power-off control unit 166, the control unit 170 may control the power supply unit 190 to maintain the power-on state. For example, the reference value Ref may be greater than a low level corresponding to a voltage at which the voltage of the node n is discharged.

The power-off control unit 166 may be a reset IC, but is not limited thereto. The reference value Ref may be set or changed in the reset IC.

For example, when the BDP signal is a normal signal, the switching element 162 is turned on to charge the node n with a voltage. In this case, the power cut-off control unit 166 may output a power-on signal.

For example, when the BDP signal is an abnormal signal, the voltage of the node n may be discharged. In this case, the power-off control unit 166 may output a power-off signal after the second time T2 has elapsed. The second time T2 may be until the voltage of the node n is less than the reference value Ref at the high level. The first time T1 may be, for example, 15 ms to 20 ms. The first time T1 may be greater than the second time T2. The first time T1 may be until the voltage of the node n goes from a high level to a low level, as described above.

A method of managing power will be described with reference to FIGS. 10 and 11.

10 shows power management in the power management unit according to the second embodiment of the present invention. FIG. 10A shows the voltage charged or discharged at the node n, and FIG. 10B shows the power of the power supply.

When the BDP signal is a normal signal, the switching element 162 is turned on to charge the node n to be charged with a high-level voltage (FIG. 10A). In this case, the power-off control unit 166 outputs a power-on signal to the control unit 170 (FIG. 10B), and the control unit 170 controls the power supply unit 190 to maintain the power-on state according to the power-on signal. It can be done (Fig. 10c).

When the BDP signal is an abnormal signal, the switching element 162 is turned off, and the voltage of the node n may be discharged from a high level to a low level for a second time T2 (FIG. 10A). In this case, the power-off control unit 166 outputs a power-on signal to the control unit 170 (FIG. 10B), and the control unit 170 controls the power supply unit 190 to maintain the power-on state according to the power-on signal. It can be done (Fig. 10c). The second time T2 is until the voltage of the node n is lower than the reference value Ref at the high level, and the reference value Ref may be greater than the low level. For example, the reference value Ref may be a voltage corresponding to 20% to 30% of the high level of the voltage charged in the node n.

When the BDP signal is an abnormal signal and the second time T2 has elapsed, the power-off control unit 166 outputs a power-off signal to the control unit 170 (FIG. 10B), and the control unit 170 powers off according to the power-off signal. It is possible to control the power supply unit 190 to cut off (Fig. 10c).

11 shows power management when an instantaneous malfunction occurs in the power management unit according to the second embodiment of the present invention.

As shown in FIG. 11A, when an instantaneous malfunction is taken at a certain point P within the second time T2 and changes to a normal state, the power management unit 160 includes a normal signal from the display 180. It is possible to receive a BDP signal. In this case, the switching element 162 is turned on by the normal signal, and the voltage discharged at the node n may be charged again. Accordingly, the voltage of the node n at an arbitrary point in time P may be charged to a high level. Accordingly, even when the second time T2 elapses, since the voltage of the node n is greater than the reference value Ref, the power-off control unit 166 outputs a power-on signal to the control unit 170, and the control unit 170 May control the power supply unit 190 to maintain the power-on state according to the power-on signal.

According to the second embodiment, if an instantaneous malfunction is taken within the second time period (T2), the power is continuously turned on without shutting off the power, so that the power is cut off even in an instantaneous malfunction, thereby lowering the reliability of the product. And customer complaints.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (15)

Power supply;
display;
A control unit for controlling the power supply and the display; And
A power management unit connected between the display and the control unit to control power supply of the power supply unit according to a BDP signal from the display,
The power management unit,
When the BDP signal is an abnormal signal, a power-off signal is output to the control unit after a predetermined period of time has passed. The method of claim 1,
The power management unit,
A switching element that is switched according to the BDP signal; And
A display device comprising a charging/discharging device connected to the switching device and charged and discharged according to the switching of the switching device. The method of claim 2,
The control unit,
Connected to a node between the switching element and the charging/discharging element,
A display device controlling the power supply to cut off power after a first time elapses because the voltage of the node is discharged. The method of claim 3,
The first time,
A display device in which the voltage of the node goes from a high level to a low level. The method of claim 3,
The low level is,
A display device having a voltage of 30% or less of the high level. The method of claim 2,
The power management unit,
The display device further comprises a power cut-off control unit (166) connected between the node between the switching element and the charging/discharging element and the control unit to control output of a power control signal. The method of claim 6,
When the BDP signal is a normal signal, a voltage is charged to the node,
The power cut-off control unit outputs a power-on signal. The method of claim 7,
When the BDP signal is an abnormal signal, the voltage of the node is discharged,
The power-off control unit outputs a power-off signal after a second time has elapsed. The method of claim 8,
The second time,
Display device until the voltage of the node is lower than the reference value at the high level. The method of claim 8,
The first time is greater than the second time. The method of claim 9,
The reference value is greater than the low level display device. The method of claim 6,
The power cut-off control unit,
Detecting a discharge voltage discharged from the charging/discharging device,
Obtains whether the detected discharge voltage is less than a reference value,
When the discharge voltage is less than the reference value, the display device for outputting a power off signal. The method of claim 12,
The control unit,
A display device configured to control the power supply to cut off power when the power off signal is received from the power cut off control unit. The method of claim 12,
The control unit,
When receiving the power-on signal from the power-off control unit, the display device controls the power supply to maintain the power-on state. The method of claim 1,
The predetermined time is 15ms to 20ms display device.

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