KR20210036231A - Pixel and Display comprising pixels - Google Patents

Abstract

Embodiments of the present invention relate to a pixel and a display device including the same. According to the present invention, the display device comprises: a display unit including a plurality of pixels, wherein the plurality of pixels individually include pixel circuits; a column driver connected to each of the pixel circuits to transmit a first voltage signal to the pixel circuits through a column line; and a row driver connected to each of the pixel circuits to transmit a second voltage signal to the pixel circuits through a row line, wherein the pixel circuit determines a preset rule for the first voltage signal and the second voltage signal, generates a signal corresponding to the rule, and performs an operation.

Description

Pixel and display comprising pixels

The present embodiments relate to a pixel and a display device including the same.

As the information society develops, the demand for display devices that display images is increasing. Liquid Crystal Display Device, Plasma Display Device, Organic Light Emitting Display Device Various types of display devices such as, etc. are being used. Recently, interest in a display device using a micro light emitting diode (μLED) (hereinafter referred to as "micro display device") is also increasing.

As excellent display device characteristics are required for VR (Virtual Reality), AR (Augmented Reality), and MR (Mixed Reality) technologies, the development of micro LED on Silicon or AMOLED on silicon is increasing. There is an increasing demand for minimization.

In particular, in the case of configuring a pixel circuit in a semiconductor, as the number of contact points connected between the pixel circuit and the line increases, the pick & place yield and efficiency decrease, and it may be difficult to implement a large-sized display device.

Accordingly, research for a display device structure to minimize the number of contact points required to improve pick & place efficiency is being conducted.

The present invention is in accordance with the above-described necessity, and an object of the present invention is to provide a display device for reducing the number of contacts to a pixel circuit.

However, these problems are exemplary, and the scope of the present invention is not limited thereby.

A display device according to an embodiment of the present invention includes: a display unit including a plurality of pixels; A column driver, each of the plurality of pixels including a pixel circuit, and connected to each of the pixel circuits to transmit a first voltage signal to the pixel circuit through a column line; A row driver connected to each of the pixel circuits to transmit a second voltage signal to the pixel circuit through a row line; And the pixel circuit determines a preset rule for the first voltage signal and the second voltage signal, and generates a signal corresponding to the rule to perform an operation.

In addition, the first voltage signal may be a power voltage and a first signal superimposed, and the second voltage signal may be a ground voltage and a second signal superimposed.

In addition, the first signal is a signal for generating data, the second signal is a signal for generating a clock, and the preset rule is when the first signal is in a level rising state and the second signal is in a level maintaining state Data may be generated, and a clock may be generated when the first signal is in a level maintaining state and the second signal is in a level rising state.

Meanwhile, the first signal may be a data signal, the second signal may be a switch clock signal, and the preset rule may be to perform an operation corresponding to a data writing period and an emission period in response to the second signal.

Other aspects, features, and advantages other than those described above will become apparent from the detailed contents, claims, and drawings for carrying out the following invention.

According to an embodiment of the present invention made as described above, it is possible to reduce the number of contacts required for signal transmission in the pixel circuit. That is, it is possible to increase the yield and efficiency of pick & place with a simplified contact structure.

Accordingly, it is possible to implement a display device including a small-sized pixel, thereby innovatively reducing the cost.

Of course, the scope of the present invention is not limited by these effects.

1 is a schematic diagram illustrating a manufacturing process of a display device according to an exemplary embodiment of the present invention.
2 shows components of a display device for explaining a contact point connected to a conventional pixel circuit.
3 is a block diagram schematically illustrating components of a display device according to an exemplary embodiment of the present invention.
4 is a block diagram illustrating components of a signal control unit according to an embodiment of the present invention.
5 illustrates a display device with reduced contact points connected to a pixel circuit according to an exemplary embodiment of the present invention.
6 is a block diagram illustrating components included in a digital driving pixel according to an embodiment of the present invention.
7A to 7C are diagrams for explaining a preset rule for generating data and a clock by a data clock generation unit according to an embodiment of the present invention.
8 is a circuit diagram illustrating a method of operating a data clock generator according to an embodiment of the present invention.
9 is a block diagram illustrating components included in an analog driving pixel according to an embodiment of the present invention.
10 is a diagram illustrating an example of a signal transmitted through a column line and a row line according to an embodiment of the present invention.

Hereinafter, various embodiments of the present disclosure will be described in connection with the accompanying drawings. Various embodiments of the present disclosure may be subjected to various changes and may have various embodiments, and specific embodiments are illustrated in the drawings and related detailed descriptions are described. However, this is not intended to limit the various embodiments of the present disclosure to specific embodiments, and it should be understood that all changes and/or equivalents or substitutes included in the spirit and scope of the various embodiments of the present disclosure are included. In connection with the description of the drawings, similar reference numerals have been used for similar elements.

In various embodiments of the present disclosure, "includes." Or "have." The terms such as, etc. are intended to designate the existence of features, numbers, steps, actions, components, parts, or a combination of them described in the specification, and one or more other features or numbers, steps, actions, components, parts, or It is to be understood that the possibility of the presence or addition of those combinations thereof is not preliminarily excluded.

Expressions such as "first", "second", "first", or "second" used in various embodiments of the present disclosure may modify various elements of various embodiments, but do not limit the corresponding elements. Does not. For example, the expressions do not limit the order and/or importance of corresponding components, and may be used to distinguish one component from another component.

When a component is referred to as being "connected" or "connected" to another component, the component is directly connected to or may be connected to the other component, but the component and It should be understood that new other components may exist between the other components.

In an embodiment of the present disclosure, terms such as "module", "unit", "part" are terms used to refer to components that perform at least one function or operation, and these components are hardware or software. It may be implemented or may be implemented as a combination of hardware and software. In addition, a plurality of "modules", "units", "parts", etc., are integrated into at least one module or chip, and at least one processor, except when each needs to be implemented as individual specific hardware. Can be implemented as

Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and ideal or excessively formal unless explicitly defined in various embodiments of the present disclosure. It is not interpreted in meaning.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram illustrating a manufacturing process of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a display device 30 according to an exemplary embodiment may include a light emitting device array 10 and a driving circuit board 20. The light emitting device array 10 may be coupled to the driving circuit board 20.

The light emitting device array 10 may include a plurality of light emitting devices. The light emitting device may be a light emitting diode (LED). At least one light emitting device array 10 may be manufactured by growing a plurality of light emitting diodes on the semiconductor wafer SW. Accordingly, the display device 30 can be manufactured by combining the light emitting device array 10 with the driving circuit board 20 without the need to individually transfer the light emitting diodes to the driving circuit board 20.

Pixel circuits corresponding to each of the light emitting diodes on the light emitting device array 10 may be arranged on the driving circuit board 20. The light emitting diodes on the light emitting device array 10 and the pixel circuits on the driving circuit board 20 may be electrically connected to form a pixel PX.

2 shows components of a display device for describing a contact point connected to a conventional pixel circuit.

Referring to FIG. 2, each pixel circuit included in a conventional display device has four contact points required for pick & place. For example, a conventional pixel circuit may require four contact points to be connected to a VCC voltage, a GND voltage, a row line (or scan/clock line), and a column line (or data line), respectively.

When the number of contact points is large as described above, manufacturing yield and transfer efficiency may be adversely affected, and it may be a cause of an increase in cost because it is difficult to reduce the pixel size. Accordingly, the present invention discloses an apparatus and method as shown in FIGS. 3 to 10 in order to reduce the number of contacts connected to the pixel circuit.

3 is a block diagram schematically illustrating components of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the display device 30 may include a pixel unit 110 and a driving unit 120.

The pixel unit 110 may display an image using an m-bit digital image signal capable of displaying 1 to 2m gray scales. The pixel unit 110 may include a plurality of pixels PX arranged in various patterns such as a predetermined pattern, for example, a matrix type and a zigzag type. The pixel PX emits one color and, for example, may emit one color of red, blue, green, and white. The pixel PX may emit colors other than red, blue, green, and white.

The pixel PX may include a light emitting device. The light emitting device may be a self-luminous device. For example, the light emitting device may be a light emitting diode (LED). The light emitting device may be a light emitting diode (LED) having a micro to nano unit size. The light emitting device may emit light with a single peak wavelength or may emit light with a plurality of peak wavelengths.

The pixel PX may further include a pixel circuit connected to the light emitting device. The pixel circuit may include at least one thin film transistor and at least one capacitor. The pixel circuit may be implemented by a semiconductor stack structure on a substrate.

The pixel PX may operate in a frame unit. One frame may be composed of a plurality of subframes. Each subframe may include a data writing period and a light emission period. Digital data of a predetermined bit may be applied to the pixel PX and stored during the data writing period. Digital data of a predetermined bit stored in the light emission period is read in synchronization with a clock signal, and the digital data is converted into a PWM signal, so that the pixel PX can express grayscale. The light emission period of the subframe may be a sum of times allocated to each bit of digital data.

The driving unit 120 may drive and control the pixel unit 110. The driving unit 120 according to an embodiment of the present invention may include a signal control unit 121, a column driving unit 122, and a row driving unit 123.

The signal control unit 121 may generate and control a signal for transmission to the pixel unit 110 through the column driving unit 122 and the row driving unit 123. According to an embodiment of the present invention, the signal control unit 121 may generate a first voltage signal and a second voltage signal, and may transmit them to the column driver 122 and the row driver 123.

For example, the first voltage signal may be a signal in which a signal for generating data is superimposed on the VCC voltage, and the second voltage signal may be a signal in which a signal for generating a clock is superimposed on the ground voltage. However, this is only an example, and according to another embodiment of the present invention, the first voltage signal may be a signal in which a signal for generating a clock is superimposed on the VCC voltage, and the second voltage signal generates data on the ground voltage. A signal for performing may be an overlapping signal. This will be described with reference to FIG. 4.

The column driver 122 and the row driver 123 may transmit the first voltage signal and the second voltage signal to the pixel unit 110 through column lines CL1 to CLm and row lines RL1 to RLn. The pixel circuit included in the pixel 111 may generate data and clocks corresponding to the first voltage signal and the second voltage signal.

4 is a block diagram illustrating components of a signal control unit according to an embodiment of the present invention.

Referring to FIG. 4, the signal control unit 121 of the present invention may include a control unit 124, a power supply unit 125, and a signal generation unit 126.

The control unit 124 may control the power supply unit 125 and the signal generation unit 126 to generate a first voltage signal including a data signal and a second voltage signal including a clock signal. The first voltage signal of the present invention may be a power voltage and a first signal superimposed on it, and the second voltage signal may be a ground voltage and a second signal superimposed.

According to an embodiment, the first voltage signal may be a signal for generating data superimposed on a power voltage, and the second voltage signal may be a signal for generating a clock superimposed on a ground voltage. However, this is only an example, and the first voltage signal may be a signal for generating a clock superimposed on the power voltage, and the second voltage signal may be a signal for generating data superimposed on a ground voltage. As another example, the first voltage signal may be a power supply voltage and data superimposed, and the second voltage signal may be a ground voltage and a switch clock signal superimposed.

Specifically, the controller 124 may control the power supply 125 to output the power voltage VCC and the ground voltage GND. The control unit 124 generates a signal to superimpose a first signal (eg, a signal for generating a clock) and a second signal (eg, a signal for generating data) on each of the power supply voltage VCC and the ground voltage GND. The unit 126 can be controlled.

In this case, a signal for generating a clock and a signal for generating data may be detected according to a preset rule in the pixel circuit included in the pixel 111, and the pixel circuit may generate data and clock in response to the preset rule. Can be generated.

According to an embodiment of the present invention, the first signal may be an analog data signal, and the second signal may be a switch clock signal. In this case, the second signal may be a switch clock corresponding to the data writing period and the light emitting period, and the pixel circuit may perform an operation corresponding thereto.

5 illustrates a display device with reduced contact points connected to a pixel circuit according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the pixel 111 of the display unit 110 of the present invention is connected to a contact connected to a row line RL connected to the row driving unit 123 and a column line CL connected to the column driving unit 122. It may include a contact point.

The column driver 122 may transmit a first voltage signal to the pixel 111, and the row driver 123 may transmit a second voltage signal to the pixel 111. For example, the column driver 122 may transmit a signal in which the data generation signal is superimposed on the power voltage VCC to the pixel 111, and the row driver 123 is the clock generation signal superimposed on the ground voltage GND. The resulting signal may be transmitted to the pixel 111. In another embodiment, the column driver 122 may transmit a signal in which the clock generation signal is superimposed on the power voltage VCC to the pixel 111, and the row driver 123 has the data generation signal superimposed on the ground voltage GND. The resulting signal may be transmitted to the pixel 111.

In another embodiment, the column driver 122 may transmit a signal in which the data generation signal is superimposed on the ground voltage GND to the pixel 111, and the row driver 123 may transmit a clock generation signal to the power voltage VCC. The overlapped signal may be transmitted to the pixel 111. In another embodiment, the column driver 122 may transmit a signal in which the clock generation signal is superimposed on the ground voltage GND to the pixel 111, and the row driver 123 is the data generation signal superimposed on the power voltage VCC. The resulting signal may be transmitted to the pixel 111.

That is, the display device 30 of the present invention transmits the data signal and the clock signal by superimposing the power voltage and the ground voltage, thereby reducing separate lines for data and/or clock signals, and is reduced compared to a conventional display device. It can be implemented through the contact point.

6 is a block diagram illustrating components included in a digital driving pixel according to an embodiment of the present invention.

Referring to FIG. 6, a pixel 111 may include a pixel circuit, and the pixel circuit includes a POR (Power on Reset) generation unit 112-1, a bias circuit number 112-2, and a data clock generation unit ( 113). In addition, the pixel 111 may include a memory in pixel (MIP) shift register 114 and an LED driver 115.

The POR generator 112-1 may be a circuit configuration for providing a predictable and standardized voltage to a control unit or a driver. The POR generation unit 112-1 of the present invention may provide a reference current so that the LED driver 115 can always emit LED light under the same conditions.

The bias circuit unit 112-2 may be a circuit configuration for determining an operating point of a voltage or current in advance. That is, the bias circuit unit 112-2 may set an operating point among the linear regions on the positive characteristic curve of the active device through a bias voltage or a bias current in order to operate the active device. have.

The data clock generation unit 113 may include a data generation unit 113-1 and a clock generation unit 113-2. The data generation unit 113-1 and the clock generation unit 113-2 may generate data and clocks, respectively, based on signals received through the column line CL and the row line RL. Specifically, the data generation unit 113-1 and the clock generation unit 113-2 generate data and clocks according to a preset rule based on a power voltage and a ground voltage in which the data generation signal and the clock generation signal are modulated. I can. The preset rules will be further described in FIGS. 7A to 7C.

The MIP shift register 114 is a component for storing received data inside the MIP pixel circuit for digital driving and processing the data in response to a clock. The MIP shift register 114 may transmit a data signal for each sub-pixel to the LED driver 115, and the LED driver 115 may drive a light emitting device such as an LED to emit light in response to the data signal.

7A to 7C are diagrams for explaining a preset rule for generating data and a clock by a data clock generation unit according to an embodiment of the present invention.

According to an embodiment of the present invention, the column line CL transmits a first voltage signal, and the row line RL transmits a second voltage signal. In particular, the column line CL according to the embodiment of FIG. 7A transmits a power voltage VCC in which signals are overlapped as a first voltage signal, and a ground voltage GND as a second voltage signal on the row line RL. It shows an embodiment of the transmission.

Referring to FIG. 7A, when the second voltage signal through the row line RL, that is, the ground voltage GND, is constant, the data clock generation unit 113 provides a first voltage signal through the column line CL, that is, A relative voltage change of the power supply voltage VCC in which signals are overlapped may be detected.

In this embodiment, when the second voltage signal through the row line RL is constant, the data clock generation unit 113 in this embodiment drops the level of the first voltage signal through the column line CL by a preset level (this example In FIG. 5, the case of VCC-1) may be recognized as the first case (CASE 1).

In addition, when the second voltage signal through the row line RL is constant, the data clock generation unit 113 increases the level of the first voltage signal through the column line CL by a preset level (in this example, VCC+). 1) may be recognized as a second case (CASE 2).

The data clock generation unit 113 may perform various operations such as programming execution (Program time), emission execution (Emission time), initial setting, data signal generation, and clock signal generation, depending on the case. For example, the data clock generation unit 113 may be configured to generate data when recognizing a first case, and generate a clock when recognizing a second case.

Referring to FIG. 7B, when the first voltage signal through the column line CL is constant, the data clock generator 113 may detect a relative voltage change of the second voltage signal through the row line RL. .

In particular, the column line CL according to the embodiment of FIG. 7B transmits the power voltage VCC as a first voltage signal, and uses the ground voltage GND in which the signal is superimposed on the row line RL as a second voltage signal. It shows an embodiment of the transmission.

In the present embodiment, when the first voltage signal through the column line CL is constant, the data clock generation unit 113 decreases the second voltage signal through the row line RL by a preset level (in this example, GND -1) can be recognized as a third case (CASE 3).

Also, when the first voltage signal through the column line CL is constant, the data clock generation unit 113 increases the second voltage signal through the row line RL by a preset level (in this example, GND+1). (Shown as) may be recognized as a fourth case (CASE 4).

The data clock generation unit 113 may perform various operations such as programming execution (Program time), emission execution (Emission time), initial setting, data signal generation, and clock signal generation, depending on the case. For example, the data clock generation unit 113 may be configured to generate a data signal when recognizing a third case, and generate a clock signal when recognizing a fourth case.

Referring to FIG. 7C, the data clock generator 113 may detect a relative voltage change between the first voltage signal through the column line CL and the second voltage signal through the row line RL.

In particular, the column line CL according to the embodiment of FIG. 7C transmits a power voltage VCC signal with overlapping signals as a first voltage signal, and the row line RL transmits a ground voltage GND with overlapping signals. An embodiment of transmitting as a second voltage signal is shown.

In this embodiment, the data clock generation unit 113 drops the first voltage signal through the column line CL by a preset level (shown as VCC-1 in this example), and the first voltage signal through the row line RL. 2 A case in which the voltage signal rises by a predetermined level (shown as GND+1 in this example) may be recognized as a fifth case (CASE 5).

In addition, the data clock generation unit 113 increases the first voltage signal through the column line CL by a preset level (in this example, VCC+1), and the second voltage through the row line RL. A case in which the signal falls by a predetermined level (shown as GND-1 in this example) may be recognized as a sixth case (CASE 6).

The data clock generation unit 113 may perform various operations such as programming execution (Program time), emission execution (Emission time), initial setting, data signal generation, and clock signal generation, depending on the case. For example, the data clock generation unit 113 may be configured to generate a data signal when the fifth case is recognized, and to generate a clock signal when the sixth case is recognized.

8 is a circuit diagram illustrating a method of operating a data clock generator according to an embodiment of the present invention.

The data clock generation unit 113 of FIG. 8 may be preset to generate data in the case of the second case and generate a clock in the case of the third case.

Referring to FIG. 8, the clock line CL may be connected to the first terminal of the first Zener diode ZD1, and the second terminal of the first Zener diode ZD1 is connected to the first terminal through the second point b. It can be connected to the input terminal of the inverter (1).

The first voltage signal in which the data generation signal is superimposed on the power voltage VCC may be applied to the first point a and the seventh point g through the clock line CL. The third voltage signal from which the first voltage signal is reduced through the first Zener diode ZD1 may be applied to the second point (b) and the eighth point (h).

The third voltage signal applied to the second point (b) may be input to the first inverter (1), and in response to the second voltage signal applied to the second point (b), the third point (c) And a fixed voltage signal applied to the fourth point d may be generated as an output signal.

Specifically, a voltage signal (eg, a third voltage signal) applied to the second point b also fluctuates according to fluctuations in a signal (eg, a first voltage signal) received through the column line CL. At this time, the signals applied to the third point (c) and the fourth point (d) are signals received through the row line RL (for example, the second voltage signal and the fourth voltage signal), and the embodiment of FIG. 8 In, when a signal received through the column line CL is at a high level, a signal received through the low line RL may be in a fixed state.

Accordingly, the first inverter 1 may generate a fixed voltage signal applied to the third point (c) and the fourth point (d) as an output signal in response to the input third voltage signal. That is, the first inverter 1 may output the data signal in response to the power voltage VCC signal in which the data generation signal received through the clock line CL is superimposed.

The row line RL may be connected to the first terminal of the second Zener diode ZD2, and the second terminal of the second Zener diode ZD2 is the input terminal of the second inverter 2 through the sixth point f. Can be connected to.

The second voltage signal in which the clock generation signal is superimposed on the ground voltage GND may be received through the row line RL and applied to the fifth point e and the fourth point d. The fourth voltage signal, in which the third voltage signal is reduced through the second Zener diode ZD2, may be applied to the third point c and the sixth point f.

At this time, the fourth voltage signal applied to the sixth point f may be input to the second inverter 2, and in response to the fourth voltage signal applied to the sixth point f, the seventh point ( A fixed voltage signal applied to g) and the eighth point (h) may be generated as an output signal.

Specifically, a voltage signal (eg, a fourth voltage signal) applied to the sixth point f also fluctuates according to fluctuations in a signal (eg, a second voltage signal) received through the row line RL. At this time, the signals applied to the seventh point (g) and the eighth point (h) are signals received through the column line CL (for example, the first voltage signal and the third voltage signal), and the embodiment of FIG. In, when a signal received through the low line RL is at a high level, a signal received through the column line CL may be in a fixed state.

Accordingly, the second inverter 2 may generate a fixed voltage signal applied to the seventh point (g) and the eighth point (h) as an output signal in response to the input fourth voltage signal.

That is, the second inverter 2 and the third inverter 3 may output the clock signal in response to the ground voltage GND signal in which the clock generation signal received through the row line RL is overlapped.

However, the embodiment of FIG. 8 is only an example, and the data clock generation unit 113 may be implemented with a circuit set in advance to generate a data signal and a clock signal for each of various cases (first to sixth cases). have.

As described above, the present invention has the effect of reducing the number of contacts for connecting lines to the pixel circuit by superimposing signals corresponding to data and clock signals on the power (power voltage, ground voltage) signal.

9 is a block diagram illustrating components included in an analog driving pixel according to an embodiment of the present invention.

Referring to FIG. 9, the pixel 111 may include a pixel circuit, and the pixel circuit includes a POR (Power on Reset) generation unit 116-1, a bias circuit number 116-2, and a switch clock generation unit ( 117). Further, the pixel 111 may include an LED driver 118.

The POR generator 116-1 may be a circuit configuration for providing a predictable and standardized voltage to a control unit or a driver. The POR generation unit 116-1 of the present invention may provide a reference current so that the LED driver 118 can always emit LED light under the same conditions.

The bias circuit unit 116-2 may be a circuit configuration for determining in advance an operating point of a voltage or a current. That is, the bias circuit unit 116-2 may set an operating point among the linear regions on the positive characteristic curve of the active device through a bias voltage or a bias current in order to operate the active device. have.

The switch clock generator 117 may generate a switch clock based on a signal received through the column line CL or the row line RL. Specifically, the switch clock generation unit 117 may generate the switch clock based on the power voltage VCC or the ground voltage GND in which the switch clock generation signal is modulated.

For example, the switch clock generation unit 117 includes a first switch clock for writing red (R) data, a second switch clock for writing green (G) data, and a second switch clock for writing blue (B) data. 3 A switch clock and a fourth switch clock for emission of written data may be generated. The LED driver 115 may drive the light emitting device to emit light in response to data written based on the generated switch clock.

9, a switch clock generation signal is modulated on a voltage signal (VCC or GND) corresponding to the row line (RL), and an analog data signal is superimposed on a voltage signal (VCC or GND) corresponding to the column line (CL). A block diagram for an example is shown, but this is only an example.

For example, the row line RL can transmit a signal in which analog data is superimposed on the power supply voltage VCC, and the column line CL can transmit a signal in which the switch clock generation signal is superimposed on the ground voltage GND. have.

As another example, the low line RL may transmit a signal in which analog data is superimposed on the ground voltage GND, and the column line CL may transmit a signal in which the switch clock generation signal is superimposed on the power supply voltage VCC. have.

10 is a diagram illustrating an example of a signal transmitted through a column line and a row line according to an embodiment of the present invention.

The column line CL may transmit a signal in which analog data is superimposed on the power voltage VCC, and the row line RL may transmit a signal in which the switch clock generation signal is superimposed on the ground voltage GND.

Specifically, the signal transmitted through the column line CL is an analog signal corresponding to red (R) data, an analog signal corresponding to green (G) data, and an analog signal corresponding to blue (B) data. VCC) may be overlapped. The signal transmitted through the low line (RL) is

Referring to FIG. 10, the LED driver 115 writes red (R) data in response to a first switch clock generated based on a first signal SC1, and generated based on a second signal SC2. Green (G) data may be written in response to the second switch clock, and blue (B) data may be written in response to a third switch clock generated based on the third signal SC3. In addition, the LED driver 115 may emit written data in response to a fourth switch clock generated based on the fourth signal SC4.

As described above, the present invention has the effect of reducing the number of contacts for connecting lines to the pixel circuit by superimposing signals corresponding to data and clock signals on the power (power voltage, ground voltage) signal.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but these are only exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: light emitting element array
20: driver circuit board
30: display device
120: drive unit
121: signal control unit
122: column driver
123: row drive

Claims (4)

In the display device,
A display unit including a plurality of pixels;
Each of the plurality of pixels includes a pixel circuit,
A column driver connected to each of the pixel circuits to transmit a first voltage signal to the pixel circuit through a column line;
A row driver connected to each of the pixel circuits to transmit a second voltage signal to the pixel circuit through a row line; And
The pixel circuit determines a preset rule for the first voltage signal and the second voltage signal, and generates a signal corresponding to the rule to perform an operation. The method of claim 1,
The first voltage signal is a power source voltage and a first signal superimposed, and the second voltage signal is a ground voltage and a second signal superposed. The method of claim 2,
The first signal is a signal for generating data, the second signal is a signal for generating a clock,
The preset rule generates data when the first signal is in a level rising state and the second signal is in a level maintaining state, and when the first signal is in a level maintaining state and the second signal is in a level rising state, a clock is generated. A display device that generates. The method of claim 2,
The first signal is a data signal, the second signal is a switch clock signal,
The predetermined rule is to perform an operation corresponding to a data writing period and a light emission period in response to the second signal.

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