KR20210086052A - Display apparatus - Google Patents

Abstract

According to an embodiment of the present specification, a display device includes: a display panel provided with a plurality of sub-pixels to display an image; a gate driver supplying a gate signal to the sub-pixels; a data driver supplying image data to the sub-pixels; a controller for controlling the gate driver and the data driver; a power supply unit which supplies operating power to the gate driver, data driver, and controller; and a light emitting power supply unit which receives operating power from the power supply unit and supplies driving power to the display panel. Accordingly, by compensating for noise caused by inrush current, etc., stabilized driving power is output, and electromagnetic interference, etc. can be improved.

Description

display device {DISPLAY APPARATUS}

The present specification relates to a display device, and more particularly, to a display device in which electromagnetic interference of driving power is improved.

A video display device that implements a variety of information on a screen is a key technology in the information and communication era, and is developing in the direction of thinner, lighter, portable and high-performance. Accordingly, a display device capable of being manufactured in a lightweight and thin form has been in the spotlight. The display device is a self-luminous device, and may be advantageous in terms of power consumption according to low voltage driving. In addition, the display device has excellent high-speed response speed, high luminous efficiency, viewing angle, and contrast ratio, and thus is being studied as a next-generation display. This display device implements an image through a plurality of sub-pixels arranged in a matrix form. Each of the plurality of sub-pixels includes a light emitting device and a plurality of transistors independently driving the light emitting device.

Specific examples of the flat panel display include a liquid crystal display (LCD), a quantum dot display (QD), a field emission display apparatus (FED), and an organic light emitting diode display (FED). A display device (Organic Light Emitting Diode: OLED) etc. are mentioned. Among them, the organic light emitting diode display, which does not require a separate light source and is spotlighted as a means for compact device and vivid color display, has a fast response speed and fast response by using an organic light emitting diode (OLED) that emits light by itself. , Contrast Ratio, luminous efficiency, luminance, and viewing angle are large.

The organic light emitting diode needs a current driving-based driving power to emit light. A current supply element may be used to supply driving power. In general, since various devices used in electronic products are designed separately from other components, the influence of the peripheral circuit configuration may not be considered. In this case, the current supply element may generate noise due to the influence of the inrush current in the peripheral circuit, and problems such as electromagnetic interference may occur.

In order to solve the above-mentioned problems, the present specification relates to a display device that stabilizes driving power supplied to a display panel by improving output characteristics of a current supply element by a peripheral circuit, and improves electromagnetic interference.

A display device according to an exemplary embodiment of the present specification includes a display panel provided with a plurality of sub-pixels to display an image, a gate driver supplying a gate signal to the sub-pixels, a data driver supplying image data to the sub-pixels, a gate driver and data It may include a controller controlling the driving unit, a gate driving unit, a data driving unit, a power supply supplying operating power to the controller, and a light emitting power supply receiving operating power from the power supply unit and supplying driving power to the display panel.

In addition, the display device according to the exemplary embodiment of the present specification includes a display panel provided with a plurality of sub-pixels to display an image, and a light emitting power unit supplying driving power to the display panel, and the light emitting power unit includes driving power to reduce electromagnetic interference. It can be changed according to the change of current load by receiving feedback.

In addition to the technical problems of the present specification mentioned above, other features and advantages of the present specification will be described below or will be clearly understood by those of ordinary skill in the art to which this specification belongs from the description and description.

According to the embodiments of the present specification, a stabilized driving power may be output by compensating for noise caused by inrush current or the like. Since the driving power is stabilized in this way, an effect of improving electromagnetic interference and the like can be obtained.

In addition, since it operates to compensate for the change in the current load, it is possible to prevent driving failure due to the change in the current load and improve image quality.

Effects according to the present specification are not limited by the contents exemplified above, and more various effects are included in the present invention.

1 is a system configuration diagram of a display device according to exemplary embodiments of the present specification.
2 is a diagram illustrating a configuration of a light emitting power unit in a display device according to an exemplary embodiment of the present specification.
3 is a diagram illustrating a driving power feedback unit in a display device according to an exemplary embodiment of the present specification.
4 is a detailed diagram of an analog-to-digital converter in a display device according to an exemplary embodiment of the present specification.
5 is a diagram illustrating a driving power output unit in a display device according to an exemplary embodiment of the present specification.

Advantages and features of the present specification, and a method of achieving them will become apparent with reference to examples described below in detail in conjunction with the accompanying drawings. However, the present specification is not limited to the examples disclosed below, but will be implemented in various different forms, and only examples of the present specification allow the disclosure of the present specification to be complete, and it is common in the technical field to which the invention of the present specification belongs. It is provided to fully inform those with knowledge of the scope of the invention, and the invention of the present specification is only defined by the scope of the claims.

The shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining an example of the present specification are exemplary and are not limited to the matters shown in the present specification. Like reference numerals refer to like elements throughout. In addition, in describing an example of the present specification, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present specification, the detailed description thereof will be omitted.

When “includes,” “haves,” “consists of,” etc. mentioned in this specification are used, other parts may be added unless “only” is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is interpreted as including an error range even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as “on,” “on,” “under,” “next to,” etc., “directly” or “directly” One or more other parts may be placed between the two parts unless this is used.

In the case of a description of a temporal relationship, for example, when temporal precedence is described as “after,” “following,” “after,” “before”, etc., 'immediately' or 'directly' are not used. It may include a case where it is not more continuous.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present specification.

The term “at least one” should be understood to include all possible combinations of one or more related items. For example, the meaning of “at least one of the first, second, and third items” means 2 of the first, second, and third items as well as each of the first, second, or third items. It may mean a combination of all items that can be presented from more than one.

Each feature of the various examples of the present specification may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each example may be implemented independently of each other or may be implemented together in a related relationship. .

Hereinafter, an example of a display device according to an embodiment of the present specification will be described in detail with reference to the accompanying drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. And, since the scales of the components shown in the accompanying drawings have different scales from the actual for convenience of explanation, the scales shown in the drawings are not limited thereto.

1 is a system configuration diagram of a display device according to exemplary embodiments of the present specification.

Referring to FIG. 1 , a display device 100 according to an exemplary embodiment of the present specification includes a plurality of data lines DL1 to DLm, a plurality of gate lines GL1 to GLn, and a plurality of sub-pixels SP: The display panel 110 on which the sub pixels are disposed, the data driver 120 connected to the upper or lower portions of the display panel 110 and driving the plurality of data lines DL1 to DLm, and the plurality of gate lines GL1 to GLn ), the gate driver 130 for driving the data driver 120 and the controller 140 for controlling the gate driver 130, the power supply 150 for supplying operating power to each driver 120, 130, 140, etc.; and a light emitting power unit 160 for emitting light of sub-pixels of the display panel 110 .

Referring to FIG. 1 , a plurality of sub-pixels SP are arranged in a matrix type on the display panel 110 .

Accordingly, a plurality of sub-pixel lines may exist in the display panel 110 . In addition, the sub-pixel line may be a sub-pixel row or a sub-pixel column. Hereinafter, a sub-pixel row is described as a sub-pixel line.

The data driver 120 drives the plurality of data lines DL1 to DLm by supplying data voltages to the plurality of data lines DL1 to DLm. Here, the data driver 120 is also referred to as a source driver. The gate driver 130 sequentially drives the plurality of gate lines GL1 to GLn by sequentially supplying scan signals to the plurality of gate lines GL1 to GLn. Here, the gate driver 130 is also referred to as a scan driver.

The controller 140 supplies various control signals to the data driver 120 and the gate driver 130 to control the data driver 120 and the gate driver 130 .

The controller 140 may start scanning according to timing implemented in each frame, and may convert input image data input from the outside to match the data signal format used by the data driver 120 . Then, the controller 140 outputs the converted image data and controls the data driving at an appropriate time according to the scan.

The gate driver 130 sequentially supplies a scan signal of an on voltage or an off voltage to the plurality of gate lines GL1 to GLn under the control of the controller 140 to the plurality of gate lines ( GL1 to GLn) are driven sequentially.

As shown in FIG. 1 , the gate driver 130 may be positioned on only one side of the display panel 110 according to a driving method or a panel design method. As another example, the gate driver 130 may be positioned on both sides of the display panel 110 . Also, the gate driver 130 may include one or more gate driver integrated circuits (GDICs).

When a specific gate line is opened, the data driver 120 converts the input image data received from the controller 140 into an analog data voltage and supplies it to the plurality of data lines DL1 to DLm. DL1 to DLm).

The data driver 120 may drive a plurality of data lines including at least one source driver integrated circuit (SDIC).

Each of the aforementioned gate driver integrated circuit or source driver integrated circuit may be connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip-on-glass (COG) method. have. As another example, the gate driver integrated circuit or the source driver integrated circuit may be directly disposed on the display panel 110 , or may be integrated and disposed on the display panel 110 in some cases.

Each source driver integrated circuit may include a logic unit including a shift register and a latch circuit, a digital analog converter (DAC), an output buffer, and the like. The source driver integrated circuit is a sensing controller for sensing the characteristics of the sub-pixel in order to compensate for the characteristics of the sub-pixel (eg, the threshold voltage Vth of the transistor, the threshold voltage Vth of the organic light emitting diode, the luminance of the sub-pixel, etc.) (200 in FIG. 4 ) may be further included.

In addition, each source driver integrated circuit may be implemented in a Chip On Film (COF) method. In this case, one end of each source driver integrated circuit is bonded to at least one source printed circuit board, and the other end is bonded to the display panel 110 .

Meanwhile, the controller 140 transmits various timing signals including a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input data enable (DE) signal, and a clock signal CLK to the input image. Receive with data from external (eg host system).

The controller 140 may output the converted image data by converting the image data input from the outside according to the data signal format used by the data driver 120 . Also, in order to control the data driver 120 and the gate driver 130 , the controller 140 performs timing of the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the input DE signal, and the clock DCLK. A signal is received, various control signals are generated and output to the data driver 120 and the gate driver 130 .

For example, the controller 140 controls the gate driver 130 , a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable signal (GOE). : Outputs various gate control signals (GCS: Gate Control Signal) including Gate Output Enable).

Here, the gate start pulse GSP controls the operation start timing of one or more gate driver integrated circuits constituting the gate driver 130 . The gate shift clock GSC is a clock signal commonly input to one or more gate driver integrated circuits and controls the shift timing of the scan signal (gate pulse). The gate output enable signal GOE specifies timing information of one or more gate driver integrated circuits.

In addition, the controller 140 controls the data driver 120 , a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (SOE: Source). Various data control signals (DCS: Data Control Signal) including output enable) are output.

Here, the source start pulse SSP controls the data sampling start timing of one or more source driver integrated circuits constituting the data driver 120 . The source sampling clock SSC is a clock signal that controls the sampling timing of data in each of the source driver integrated circuits. The source output enable signal SOE controls the output timing of the data driver 120 .

The controller 140 may be disposed on a source printed circuit board to which at least one source driver integrated circuit is bonded. As another example, the controller 140 may be disposed on a control printed circuit board connected through a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit (FPC). have.

Also, the controller 140 may be separately formed outside the substrate. Alternatively, the controller 140 may be formed integrally with the data driver 120 . In this case, in the data driver 120 , the source driver integrated circuit may be implemented in a chip on film (COF) method or may be implemented on a substrate in a chip on glass (COG) method.

The display device 100 includes a power supply unit 150 that supplies various voltages or currents to the data driver 120 , the gate driver 130 , and the controller 140 , or controls various voltages or currents to be supplied. . The power supply 150 may control a driving voltage supplied to the data driver 120 , the gate driver 130 , and the controller 140 . For example, the power supply unit 150 may supply various voltages or currents or control the supplied voltages or currents.

The power supply unit 150 starts to operate when the input power Vin supplied from the host system is equal to or higher than the UVLO (Under Voltage Lock Out) level, and generates an output signal after a predetermined time delay. The output signal of the power supply 150 may include a gate high voltage VGH, a gate low voltage VGL, a logic voltage VCC, and a common voltage GND. The gate high voltage VGH is a voltage set to be greater than or equal to a threshold voltage of the transistors TFTs formed in the subpixel SP of the display device 100 . The gate low voltage VGL may be set to a voltage lower than the threshold voltage of the transistors TFTs formed in the subpixel SP of the display device 100 . The gate high voltage VGH and the gate low voltage VGL are supplied to the gate driver 130 .

In addition, the light emitting power unit 160 may receive operating power from the power supply unit 150 to supply the high potential driving power EVDD and the low potential driving power EVSS to the display panel 110 . Although it has been described that the light emitting power unit 160 is driven by receiving operating power from the power supply unit 150, the present invention is not limited thereto, and operating power may be directly applied from the outside (eg, a host system).

The display device 100 according to the exemplary embodiments of the present specification is an organic light emitting display device, in which each subpixel SP is an organic light emitting diode (OLED) and driving the same. It is comprised by circuit elements, such as a transistor (TFT) for the following. The type and number of circuit elements constituting each sub-pixel SP may be variously determined according to a provided function and a design method.

2 is a diagram illustrating a configuration of a light emitting power unit in a display device according to an exemplary embodiment of the present specification.

Referring to FIG. 2 , the light emitting power supply unit 160 may include a current supply element 161 and a peripheral circuit unit 162 .

The light emitting power unit 160 may receive operating power from the power supply unit 150 to supply high potential driving power EVDD and low potential driving power EVSS to the display panel 110 .

The current supply device 161 of the light emitting power unit 160 generates high potential and low potential driving power EVDD and EVSS supplied to a plurality of sub-pixels of the display panel 110 , and the peripheral circuit unit 162 supplies current. It may be designed to supply the high potential and low potential driving power EVDD and EVSS generated by the device 161 to the display panel 110 .

The peripheral circuit unit 162 of the light emitting power unit 160 may be configured to further amplify or stabilize the high potential and low potential driving powers EVDD and EVSS. However, the present invention is not limited thereto, and may be designed to have various configurations according to the purpose.

In general, the current supply element 161 of the light emitting power unit 160 may be configured in the form of an integrated circuit (Integrated Circuit). The current supply device 161 in the form of an integrated circuit may be separately manufactured and mounted on a substrate through a surface mount process or the like. Accordingly, the configuration of the current supply element 161 may be designed without considering the influence of the configuration of the peripheral circuit unit 162 . For this reason, impedance may not be matched between the current supply element 161 and the peripheral circuit unit 162 , and a change in current load such as an inrush current may occur due to this.

The light emitting power supply unit 160 may be configured such that the current supply device 161 compensates for a change in current load regardless of the configuration of the peripheral circuit unit 162 .

The light emitting power unit 160 may sense a change in current load caused by the operation of the peripheral circuit unit 162 of the current supply element 161 . And, by comparing the high potential and low potential driving powers EVDD and EVSS generated by the current supply device 161 with the high potential and low potential driving powers EVDD and EVSS fed back from the peripheral circuit unit 162, the current load It can operate to compensate for changes.

The current supply element 161 may include a driving power generator 1611 , a driving power feedback unit 1612 , an analog-to-digital converter 1613 , and a driving power output unit 1614 .

The driving power generator 1611 may generate high potential and low potential driving power EVDD and EVSS.

The driving power feedback unit 1612 may sense an inrush current by receiving the output high potential and low potential driving power EVDD and EVSS as feedback from the current supply device 161 to the peripheral circuit unit 162 . In addition, the driving power feedback unit 1612 may calculate a voltage difference between the high potential and low potential driving powers EVDD and EVSS generated by the driving power generating unit 1611 .

The analog-to-digital converter 1613 may convert the voltage difference calculated by the driving power feedback unit 1612 into a digital signal.

The driving power output unit 1614 may output stabilized high potential and low potential driving power EVDD and EVSS by compensating for noise caused by an inrush current or the like. As such, when the high potential and low potential driving power sources EVDD and EVSS are stabilized, electromagnetic interference (EMI) and the like may be improved.

A detailed configuration of the current supply element 161 will be described in more detail with reference to FIGS. 3 to 5 .

3 is a diagram illustrating a driving power feedback unit in a display device according to an exemplary embodiment of the present specification.

Referring to FIG. 3 , the driving power feedback unit 1612 may include a plurality of amplifiers and may include first to third amplifiers 1612a, 1612b, and 1612c.

The first amplifier 1612a may operate as an addition amplifier. In the first amplifier 1612a, the feedback voltage FB fed back from the peripheral circuit unit 162 may be applied to an input terminal, and the reference voltage Vref may be applied to another input terminal.

The feedback voltage FB and the reference voltage Vref applied to the input terminal of the first amplifier 1612a are calculated by calculating the ratios of the input resistances R1 and R2 and the feedback resistance R3 of the first amplifier 1612a. One output voltage V1 can be calculated.

The reference voltage Vref may operate as an offset to increase the voltage level of the feedback voltage FB. The reference voltage Vref may be supplied from an external system. As another example, the reference voltage Vref may be generated inside the current supply element 161 with reference to a preset value stored in the memory in the controller 140 in the form of a look-up table.

The second amplifier 1612b may operate as an inverting amplifier. Since the polarity of the first output voltage V1 output from the first amplifier 1612a may be reversed, the first output voltage V1 may be inverted to have a positive value again.

To this end, the second amplifier 1612b ground the non-inverting terminal (+) of the input terminal, and input the first output voltage (V1) output from the first amplifier 1612a of the inverting terminal (-) to the inverted A second output voltage V2 may be output. In addition, the voltage gain of the second amplifier 1612b may be determined according to each of the input resistance R4 and the feedback resistance R5 . And, when the input resistance R4 and the feedback resistor R5 have the same value, the second amplifier 1612b may output only the phase inverted.

The third amplifier 1612c may operate as a differential amplifier. The third amplifier 1612c receives the generated voltage V0 of the high potential and low potential driving power EVDD and EVSS generated by the driving power generator 1611 as an inverting terminal (-), and the second amplifier 1612b ) may receive the second output voltage V3 output from the non-inverting terminal (+).

The third amplifier 1612c may amplify the voltage difference between the generated voltage V0 and the second output voltage V3 and output it as the third output voltage V3 . The third output voltage V3 may have an analog voltage value.

The driving power feedback unit 1612 may transfer the third output voltage V3 generated through the first to third amplifiers 1612a, 1612b, and 1612c to the analog-to-digital converter 1613 .

4 is a detailed diagram of an analog-to-digital converter in a display device according to an exemplary embodiment of the present specification.

Referring to FIG. 4 , the analog-to-digital converter 1613 may convert the third output voltage V3 output from the driving power feedback unit 1612 into a digital signal.

The analog-to-digital converter 1613 may convert and output the third output voltage V3 into a plurality of digital signals D0 to Dn corresponding to the analog voltage with reference to a preset value stored in the form of a lookup table.

The plurality of digital signals D0 to Dn converted by the analog-to-digital converter 1613 may be expressed as digital values such as binary numbers or hexadecimal numbers. Further, the analog-to-digital converter 1613 may be finely adjusted as the number of bits increases. Also, the plurality of digital signals D0 to Dn output from the analog-to-digital converter 1613 may be input signals of the driving power output unit 1614 .

5 is a diagram illustrating a driving power output unit in a display device according to an exemplary embodiment of the present specification.

FIG. 5A is a diagram of a detailed configuration of the driving power output unit 1614 . 5B is a switch signal circuit S_SW for increasing the operation stability of the switch SW in the driving power output unit 1614 . FIG. 5C is a block diagram of a buffer inside the switch signal circuit S_SW.

Referring to FIGS. 5A to 5C , the driving power output unit 1614 may include a plurality of switches SW and resistors R.

The driving power output unit 1614 may receive the generated voltage V0 of the high potential and low potential driving powers EVDD and EVSS generated by the driving power generating unit 1611 . In addition, the driving power output unit 1614 may vary it according to the plurality of digital signals D0 to Dn output from the analog-to-digital converter 1613 .

The switch signal circuit S_SW may generate a plurality of switch signals S_SWn for turning on or off the switch SW of the driving power output unit 1614 . The plurality of switch signals S_SWn may respectively correspond to the plurality of digital signals D0 to Dn output from the analog-to-digital converter 1613 . In addition, the switch new circuit S_SW may be generated through an internal buffer to increase operation stability and applied to the switch SW of the driving power output unit 1614 .

The buffer may be composed of a pair of transistors having different polarities.

Transistor pairs of different polarities may be connected in series with each other. In addition, the drain electrode of any one transistor may be connected to the switch turn-on voltage V_SW_On, and the source electrode of the other transistor may be connected to the switch turn-on voltage V_SW_On.

In addition, the buffer is turned on or turned off by receiving the digital signal Dn output from the analog-to-digital converter 1613 as a gate electrode, and thereby a switch turn-on voltage (V_SW_On) or a switch turn-off voltage (V_SW_Off) can be selected and output as the switch signal S_SWn.

The driving power output unit 1614 may output high potential and low potential driving power EVDD and EVSS by adjusting the generated voltage V0 according to the number of switches SW that are turned on or off, respectively.

Each of the resistors R connected to the plurality of switches SW in the driving power output unit 1614 may have the same value. However, the present invention is not limited thereto, and may have different values depending on the design method of the current supply element 161 .

If there is no change in current load in the display device 100 according to the embodiment of the present specification, the generated voltage V0 of the driving power generator 1611 may be applied as high potential and low potential driving power EVDD and EVSS. have. For example, when there is no change in the current load, the feedback voltage FB of the driving power feedback unit 1612 does not differ from the generated voltage V0 of the driving power generating unit 1611 . Accordingly, all of the switch signals S_SWn generated by the switch signal circuit S_SW of the driving power output unit 1614 according to the plurality of digital signals D0 to Dn output from the analog-to-digital converter 1613 are switch turn-off voltages. It can be output as (V_SW_Off). In this case, the initial switch SW initial among the plurality of switches SW may be turned on, and the generated voltage V0 may be applied to the high potential and low potential driving power EVDD and EVSS.

A display device according to an embodiment of the present specification may be described as follows.

A display device according to an exemplary embodiment of the present specification includes a display panel provided with a plurality of sub-pixels to display an image, a gate driver supplying a gate signal to the sub-pixels, a data driver supplying image data to the sub-pixels, a gate driver and data It may include a controller controlling the driver, a gate driver, a data driver, a power supply supplying operating power to the controller, and a light emitting power supply receiving operating power from the power supply and supplying driving power to the display panel.

In the display device according to the embodiment of the present specification, the light emitting power unit includes a current supply element for generating a driving power variable according to a change in a current load, and a peripheral circuit unit for stabilizing the driving power, and the current supply element is a peripheral circuit unit. The input driving power can be fed back.

In the display device according to the exemplary embodiment of the present specification, the current supply element may include a driving power generator, a driving power feedback unit, an analog-to-digital converter, and a driving power output unit.

In the display device according to the exemplary embodiment of the present specification, the driving power feedback unit may receive a coin source input to the peripheral circuit unit as feedback, sense a change in the current load, and calculate a voltage difference according to the change in the current load.

In the display device according to the embodiment of the present specification, the analog-to-digital converter may convert the voltage difference calculated by the driving power feedback unit into a digital signal.

In the display device according to the exemplary embodiment of the present specification, the driving power output unit may receive a digital signal and vary the driving power to output it.

In the display device according to the exemplary embodiment of the present specification, the driving power output unit may include a plurality of switches and resistors.

In the display device according to the exemplary embodiment of the present specification, a plurality of switches may be turned on or off according to a digital signal, respectively, and when there is no change in current load, only an initial switch among the plurality of switches may be turned on.

In the display device according to the exemplary embodiment of the present specification, the driving power output unit may include an internal switch signal circuit that receives a digital signal and converts the digital signal into a switch signal.

In the display device according to the exemplary embodiment of the present specification, the switch signal circuit may include a plurality of buffers including a pair of transistors having different polarities connected in series to a switch turn-on voltage and a switch turn-off voltage.

In the display device according to the exemplary embodiment of the present specification, resistors may have the same or different resistance values.

A display device according to an exemplary embodiment of the present specification includes a display panel provided with a plurality of sub-pixels to display an image, and a light emitting power unit supplying driving power to the display panel, and the light emitting power unit feeding back driving power to reduce electromagnetic interference. It can be changed according to the change of the current load.

Features, structures, effects, etc. described in the above-described examples of the present specification are included in at least one example of the present specification, and are not necessarily limited to only one example. Furthermore, features, structures, effects, etc. illustrated in at least one example of the present specification may be combined or modified with respect to other examples by those of ordinary skill in the art to which this specification belongs. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present specification.

The present specification described above is not limited to the above-described embodiment and the accompanying drawings, and it is in the technical field to which this specification belongs that various substitutions, modifications and changes are possible without departing from the technical matters of the present specification. It will be clear to those of ordinary skill in the art. Therefore, the scope of the present specification is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present specification.

110: display panel
120: data driving unit
130: gate driver
140: controller
150: power supply
160: light emitting power unit

Claims (20)

a display panel provided with a plurality of sub-pixels to display an image;
a gate driver supplying a gate signal to the sub-pixels;
a data driver supplying image data to the sub-pixels;
a controller controlling the gate driver and the data driver; a power supply supplying operating power to the gate driver, the data driver, and the controller; and
and a light emitting power supply unit receiving the operating power from the power supply unit and supplying driving power to the display panel;
display device.
The method of claim 1,
The light emitting power unit,
a current supply device for generating a driving power variable according to a change in a current load; and
and a peripheral circuit part for stabilizing the driving power;
The current supply element receives the feedback of the driving power input to the peripheral circuit unit,
display device.
3. The method of claim 2,
The current supply element includes a driving power generating unit, a driving power feedback unit, an analog-to-digital converter, and a driving power output unit,
display device.
4. The method of claim 3,
The driving power feedback unit receives the driving power input to the peripheral circuit unit as feedback, detects a change in the current load, and calculates a voltage difference according to the change in the current load,
display device.
5. The method of claim 4,
The analog-to-digital converter converts the voltage difference calculated by the driving power feedback unit into a digital signal,
display device.
6. The method of claim 5,
The driving power output unit receives the digital signal and outputs the variable driving power,
display device.
7. The method of claim 6,
The driving power output unit is composed of a plurality of switches and resistors,
display device.
8. The method of claim 7,
The plurality of switches,
are turned on or off, respectively, according to the digital signal;
When there is no change in the current load, only the initial switch among the plurality of switches is turned on,
display device.
9. The method of claim 8,
The driving power output unit includes an internal switch signal circuit that receives the digital signal and converts it into a switch signal,
display device.
10. The method of claim 9,
The switch signal circuit includes a plurality of buffers comprising a pair of transistors of different polarities connected in series to a switch turn-on voltage and a switch turn-off voltage,
display device.
11. The method of claim 10,
the resistors have the same or different resistance values,
display device.
a display panel provided with a plurality of sub-pixels to display an image; and
and a light emitting power supply supplying driving power to the display panel;
The light emitting power unit receives the feedback of the driving power to reduce electromagnetic interference and varies according to a change in the current load,
display device.
13. The method of claim 12,
The light emitting power unit,
a current supply element for generating a driving power variable according to a change in the current load; and
and a peripheral circuit part for stabilizing the driving power;
The current supply element receives the feedback of the driving power input to the peripheral circuit unit,
display device.
14. The method of claim 13,
The current supply element includes a driving power generating unit, a driving power feedback unit, an analog-to-digital converter, and a driving power output unit,
display device.

15. The method of claim 14,
The driving power feedback unit receives the driving power input to the peripheral circuit unit as feedback, detects a change in the current load, and calculates a voltage difference according to the change in the current load,
display device.
16. The method of claim 15,
The analog-to-digital converter converts the voltage difference calculated by the driving power feedback unit into a digital signal,
The driving power output unit receives the digital signal and outputs the variable driving power,
display device.
14. The method of claim 13,
The driving power output unit is composed of a plurality of switches and resistors,
display device.
18. The method of claim 17,
The plurality of switches,
are turned on or off, respectively, according to the digital signal;
When there is no change in the current load, only the initial switch among the plurality of switching is turned on,
display device.
14. The method of claim 13,
The driving power output unit includes an internal switch signal circuit that receives the digital signal and converts it into a switch signal,
display device.
20. The method of claim 19,
The switch signal circuit includes a plurality of buffers comprising a pair of transistors of different polarities connected in series to a switch turn-on voltage and a switch turn-off voltage,
display device.

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