KR20200007281A - Light Emitting Display Device - Google Patents

Abstract

The present invention provides an electroluminescent display including a display panel and drive unit. The display panel displays an image. The drive unit drives the display panel. In the display panel, an organic light emitting diode of a first sub-pixel is initialized by a second sub-pixel disposed adjacent to the first sub-pixel. The electroluminescent display may reduce the power consumption for driving.

Description

Light Emitting Display Device

The present invention relates to an electroluminescent display.

With the development of information technology, the market for a display device, which is a connection medium between a user and information, is growing. Accordingly, the use of various types of display devices such as electroluminescent display devices, liquid crystal display devices, and plasma display devices is increasing.

The display device includes a display panel including a plurality of subpixels, a driver for driving the display panel, a power supply unit for supplying power to the display panel, and the like. The driver includes a scan driver that supplies a scan signal (or a gate signal) to the display panel, and a data driver that supplies a data signal to the display panel.

When the scan signal, the data signal, and the like are supplied to the subpixels, the electroluminescent display device can display an image by emitting light from the light emitting diode of the selected subpixel. The light emitting diode is implemented based on organic material or based on inorganic material.

In the electroluminescent display, the characteristics of the device deteriorate with the driving time. Therefore, a compensation circuit may be added to compensate for the deterioration or characteristic of the device. As such, adding a compensation circuit has many factors to consider such as stable driving of the device, suitability of high resolution implementation, and potential power savings.

The present invention for solving the above problems of the background art is to implement a high resolution model that can reduce the high integration and driving power consumption.

The present invention provides an electroluminescent display device including a display panel and a driving unit. The display panel displays an image. The driving unit drives the display panel. The organic light emitting diode of the first subpixel is initialized by the second subpixel disposed adjacent to the first subpixel.

The first subpixel may be located in the Nth scan line, and the second subpixel may be located in the N + 1th scan line, which is the next stage of the Nth scanline.

The first subpixel and the second subpixel may have nodes electrically connected to each other.

An anode of the organic light emitting diode of the first subpixel may be connected to the initialization transistor of the second subpixel.

The organic light emitting diode of the first subpixel may be initialized by the initialization transistor of the second subpixel during the period in which the threshold voltage of the driving transistor of the first subpixel is sampled.

Gate electrodes may be connected to the same scan line of the first transistor and the initialization transistor of the second sub pixel, which makes the driving transistor of the first sub pixel into a diode connection state.

The initialization transistor of the second subpixel includes a first initialization transistor having a gate electrode connected to the first scan line and a first electrode connected to the gate electrode of the driving transistor of the second subpixel, and a gate electrode connected to the first scan line. The first initialization transistor may include a second initialization transistor connected to a second electrode of the first initialization transistor and a second electrode connected to an initialization voltage line.

The first subpixel is connected to the first data line disposed on the left side and the second subpixel is connected to the second data line disposed on the right side, or vice versa, the first subpixel is connected to the first data line disposed on the right side. The second sub pixel may be connected to a second data line disposed on the left side.

The display panel may include subpixels emitting the same color in an oblique direction with data lines interposed therebetween.

The display panel includes a first transistor having a gate electrode connected to the scan line, a first electrode connected to the second electrode of the driving transistor, and a second electrode connected to the gate electrode of the driving transistor, and a gate electrode connected to the scan line. A second transistor having a first electrode connected to the data line and a second electrode connected to the first electrode of the driving transistor; a gate electrode connected to the light emitting signal line; and a second electrode of the second transistor and a first electrode of the driving transistor. A third transistor having a first electrode connected thereto and a second electrode connected to the first power supply line, a gate electrode connected to the light emitting signal line, a first electrode connected to the second electrode of the driving transistor, and connected to the anode electrode of the organic light emitting diode A fourth transistor having a second electrode connected thereto, a gate electrode connected to the front end scan line positioned at the front end of the scan line, and the other end of the capacitor and the driving transistor A fifth A transistor having a first electrode connected to the gate electrode, and a fifth B transistor having a first electrode connected to the second electrode of the fifth A transistor and a second electrode connected to the initialization voltage line; can do.

In another aspect, the present invention provides an electroluminescent display device including a display panel and a driver. The display panel is positioned on an Nth scan line and has a first subpixel having an organic light emitting diode, a driving transistor supplying a driving current to the organic light emitting diode, a first transistor for bringing the driving transistor into a diode connection state, and a next pixel after the Nth scan line. And a second subpixel positioned at an N + 1 scan line having an initialization transistor. The driving unit drives the display panel. The initialization transistor of the second subpixel is turned on by the Nth scan signal supplied through the Nth scan line, and transfers the initialization voltage supplied through the initialization voltage line to the anode electrode of the organic light emitting diode of the first subpixel.

A gate electrode may be connected to the Nth scan line of the first transistor of the first subpixel and the initialization transistor of the second subpixel.

The present invention implements a pentile subpixel structure capable of RGB independent driving based on a 6T (Capacitor) inverse gamma internal compensation circuit, thereby achieving high integration and driving power reduction in a high resolution model.

1 is a schematic block diagram of an organic light emitting display device.
2 is an exemplary circuit configuration of a subpixel having a compensation circuit.
3 to 5 illustrate subpixels having a compensation circuit according to an experimental example.
6 through 9 illustrate subpixels having a compensation circuit, according to an exemplary embodiment.
10 is a view for explaining the initialization and sampling method of the experimental example.
11 is a view for explaining the initialization and sampling method of the embodiment.
12 and 13 are views for explaining the advantages of the embodiment compared to the experimental example.

Hereinafter, with reference to the accompanying drawings, the specific content for the practice of the present invention will be described.

The EL display device described below includes a television, an audio / video device, a video player, a personal computer (PC), a home theater, a smartphone, a virtual reality device (VR), an augmented reality device (AR), and an indoor / outdoor advertising display device. It can be used in various fields such as a vehicle display device.

In addition, the electroluminescent display described below is not only an organic light emitting display device implemented based on an organic light emitting diode, but also an inorganic light emitting display implemented based on an inorganic light emitting diode. It can also be applied to Light Emitting Display Device). However, hereinafter, an organic light emitting display device will be described as an example.

Meanwhile, the transistors described below may be implemented in an n-type or p-type MOSFET (Metal Oxide Semiconductor Field Effect Transistor) structure. Transistors are three-terminal devices that include a gate, a source, and a drain. The source is an electrode that supplies a carrier to the transistor, and the carrier begins to flow from the source. The drain is the electrode out of the transistor in the transistor. That is, the flow of carriers in the MOSFET flows from source to drain. In the case of an n-type transistor (or n-type transistor, NMOS), since the carrier is an electron, the source voltage has a voltage lower than the drain voltage so that electrons can flow from the source to the drain. Since electrons flow from source to drain in n-type transistors, the direction of current flows from drain to source. In the case of a p-type transistor (or p-type transistor, PMOS), since the carrier is a hole, the source voltage is higher than the drain voltage so that holes can flow from the source to the drain. In a p-type transistor, current flows from source to drain because holes flow from source to drain. That is, the source and drain of the MOSFET are not fixed. For example, the source and drain of the MOSFET can be changed according to the applied voltage. Therefore, in the following embodiment, the source and the drain or the drain and the source of the transistor will be described as the first electrode and the second electrode.

In addition, the transistor described in the present invention may be formed of one of an oxide transistor (Axide TFT), an amorphous silicon transistor (a-Si TFT), and a low temperature polysilicon transistor (LTPS TFT), but is not limited thereto.

FIG. 1 is a schematic block diagram of an organic light emitting display device, and FIG. 2 is an exemplary circuit diagram of a subpixel having a compensation circuit.

As shown in FIG. 1, the organic light emitting display device includes a timing controller 151, a data driver 155, a scan driver 157, a display panel 110, and a power supply unit 153.

The timing controller 151 receives a data signal DATA and a driving signal including a data enable signal, a vertical sync signal, a horizontal sync signal, a clock signal, and the like from the image processor (not shown). The timing controller 151 controls a gate timing control signal GDC for controlling the operation timing of the scan driver 157 and a data timing control signal DDC for controlling the operation timing of the data driver 155 based on the driving signal. And so on. The timing controller 151 may be formed in the form of an integrated circuit (IC).

The data driver 155 samples and latches the data signal DATA supplied from the timing controller 151 in response to the data timing control signal DDC supplied from the timing controller 151 and digitally based on the gamma reference voltage. The signal is converted into an analog data signal (hereinafter referred to as data voltage) and output. The data driver 155 outputs a data voltage through the data lines DL1 to DLn. The data driver 155 may be formed in the form of an IC.

The scan driver 157 outputs a scan signal in response to the gate timing control signal GDC supplied from the timing controller 151. The scan driver 157 outputs a scan signal and the like through the scan lines GL1 to GLm. The scan driver 157 is formed in the form of an IC or formed in a gate in panel manner (a method of forming a transistor on a substrate in a thin film process) on the display panel 110.

The power supply unit 153 is electrically connected to the display panel 110 through the first power line VDDEL and the second power line VSSEL. The power supply unit 153 outputs a high potential voltage Vddel and a low potential voltage Vssel. The high potential voltage Vddel output from the power supply unit 153 is supplied to the display panel 110 through the first power line VDDEL and the low potential voltage Vssel is displayed through the second power line VSSEL. Supplied to 110. The power supply unit 153 may be formed in the form of an IC.

The display panel 110 includes a data voltage supplied from the data driver 155, a scan signal supplied from the scan driver 157, a high potential voltage Vddel and a low potential voltage Vssel supplied from the power supply 153. Display the image based on the. The display panel 110 receives an initialization voltage Vini in addition to the high potential voltage Vddel and the low potential voltage Vssel. The initialization voltage Vini may be supplied from the power supply unit 153 or the data driver 155. The display panel 110 includes subpixels SP that operate to display an image and emit light.

The subpixels SP may include a red subpixel, a green subpixel, and a blue subpixel, or may include a white subpixel, a red subpixel, a green subpixel, and a blue subpixel. The subpixels SP may have one or more different emission areas according to emission characteristics. The subpixels SP may include a color filter layer that converts white light into red, green, and blue light, but is not limited thereto. The subpixels SP include elements such as light emitting diodes emitting light and transistors for operating the light emitting diodes. Devices have a tendency to add compensation circuits to compensate for the deterioration of characteristics as the driving time passes.

As shown in FIG. 2, a subpixel having a compensation circuit includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, and a fifth transistor T5a and T5b. (As an initialization transistor, T5a may be defined as a first initialization transistor and T5b may be defined as a second initialization transistor), a driving transistor DT, a capacitor CST, and an organic light emitting diode OLED.

The first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5a and T5b, and the driving transistor DT are p-type transistors (p-MOS). TFT).

The first transistor T1 has a gate electrode connected to an Nth scan line SCAN [n] (the current stage scan line), and a second electrode of the driving transistor DT and a first electrode of the fourth transistor T4. The first electrode is connected to the third node connected in common, and the second electrode is connected to the first node in which the gate electrode of the driving transistor DT and the other end of the capacitor CST are connected in common.

In the second transistor T2, a gate electrode is connected to the N-th scan line SCAN [n], a first electrode is connected to the first data line DL1, and the first and third transistors of the driving transistor DT are connected to each other. The second electrode is connected to a second node to which the first electrode of T3 is commonly connected.

In the third transistor T3, a first electrode is connected to a second node having a gate electrode connected to an emission signal line EM, and a second electrode of the second transistor T2 and a first electrode of the driving transistor DT commonly connected to each other. The second electrode is connected to the first power line VDDEL.

In the fourth transistor T4, a gate electrode is connected to the light emission signal line EM, a first electrode is connected to the second electrode of the driving transistor DT, and a second electrode is connected to the anode electrode of the organic light emitting diode OLED. do.

The fifth transistors T5a and T5b are two transistors in order to increase driving stability (current leakage prevention, etc.) but may be configured as one example. The fifth A transistor T5a has a gate electrode connected to an Nth scan line SCAN [n-1] (the previous stage scan line), the first end of the capacitor CST and a gate electrode of the driving transistor DT. The electrode is connected and the second electrode is connected to the first electrode of the 5B transistor T5b. In the fifth B transistor T5b, a gate electrode is connected to the Nth scan line SCAN [n-1], a first electrode is connected to the second electrode of the 5A transistor T5a, and the first voltage is connected to the initialization voltage line VINI. Two electrodes are connected.

The driving transistor DT has a gate electrode connected to a first node in which a second electrode of the first transistor T1, the other end of the capacitor CST, and a first electrode of the 5A transistor T5a are connected in common, and the second transistor A first electrode is connected to a second node in which the second electrode of T2 and the first electrode of the third transistor T3 are connected in common, and the first electrode and the fourth transistor T4 of the first transistor T1 are connected to each other. The second electrode is connected to a third node to which the first electrode is commonly connected.

One end of the capacitor CST is connected to the first power line VDDEL and the second electrode of the third transistor T3, the first electrode of the 5A transistor T5a, the gate electrode of the driving transistor DT, and the first electrode of the capacitor CST. The other end is connected to the first node to which the second electrode of the transistor T1 is commonly connected.

In the organic light emitting diode OLED, an anode electrode is connected to the second electrode of the fourth transistor T4, and a cathode electrode is connected to the second power line VSSEL.

The present invention is to implement a circuit that can initialize not only the first node of the driving transistor DT but also the anode electrode of the organic light emitting diode OLED based on the initialization voltage transmitted through the initialization voltage line VINI. As such, adding circuits has many factors to consider, such as the stable driving of the device, the suitability of high resolution implementation, and the possibility of reducing power consumption.

Experimental Example

3 to 5 are diagrams for describing subpixels having a compensation circuit according to an experimental example.

As shown in FIG. 3, the experimental example is based on the subpixels shown in FIG. 2. The sixth transistor T6 is added to initialize not only the first node of the driving transistor DT but also the anode electrode of the organic light emitting diode OLED based on the initialization voltage transmitted through the initialization voltage line VINI.

In the sixth transistor T6, a gate electrode is connected to the Nth scan line SCAN [n], a first electrode is connected to the anode electrode of the organic light emitting diode OLED, and a second electrode is connected to the initialization voltage line VINI. Connected. When the sixth transistor T6 is turned on, the anode of the organic light emitting diode OLED is initialized by an initialization voltage transmitted through the initialization voltage line VINI.

As shown in FIG. 4, the subpixels according to the experimental example are arranged in the form of RGBG on the display panel. According to this structure, the green sub-pixel G is vertically disposed so as to be continuous to the top (or first scanline end) and the bottom (or second scanline end), but the red subpixel R and the blue subpixel B are Are alternately arranged at the top and the bottom so as to be adjacent to the top and the bottom and have the same color in the diagonal direction with the green sub-pixel G and the data line connected thereto interposed therebetween.

As shown in FIG. 5, all sub pixels on the display panel are implemented based on the circuit shown in FIG. 3. According to the experimental example, the green subpixel G connected to the second data line DL2 is irrelevant but the red subpixel R and the blue subconnected to the first data line DL1 and the third data line DL3 are not related. The pixel B uses the same data line and uses a driving method of changing the data voltage for each scan line.

<Example>

6 through 9 are diagrams for describing subpixels having a compensation circuit, according to an exemplary embodiment.

As illustrated in FIG. 6, the subpixels according to the embodiment are arranged in the form of RGBG on the display panel similarly to the experimental example, but the same color is disposed in the diagonal direction with the data lines interposed therebetween. According to this structure, the left and right adjacent sub-pixels emitting the same color are arranged so as to be positioned diagonally with the data line therebetween. That is, the embodiment has a subpixel structure in the form of a pentile (or similar).

For example, a red subpixel R is disposed at an upper left and a lower right side of the second data line DL2 and a green subpixel G is disposed at the lower left and an upper right of the second data line DL2. However, it can be seen that the green subpixel G is disposed at the lower right side with respect to the third data line DL3 and the blue subpixel B is disposed at the upper left side with respect to the fourth data line DL4. As shown, if there is a first pair in which RG is arranged at the top and bottom, a second pair in which BG is arranged at the top and bottom is present.

According to an embodiment, the red subpixel is connected to the red data line, the green subpixel is connected to the green dataline, and the blue subpixel is connected to the blue dataline. In addition, at least two sub-pixels adjacent to each other at the top and the bottom and emitting different colors have nodes that help electrical connection therebetween.

As illustrated in FIG. 7, an anode of an organic light emitting diode included in an upper subpixel by an electrical connection node may be initialized through a transistor included in a lower subpixel, which will be described in more detail below.

As shown in FIG. 8, a red sub-pixel R as a first sub pixel at an upper end (eg, an Nth scan line end) and a green as a second sub pixel at a lower end (eg an N + 1 scan line end). The subpixel G may be disposed. The red subpixel R is connected to the second data line DL2 disposed on the right side, and the green subpixel G is connected to the first data line DL1 disposed on the left side (or vice versa). Can be. The connection relationship between the elements included in the upper red sub-pixel R and the elements included in the lower green sub-pixel G is different.

[Top Red Sub Pixel (R)]

A third node of the first transistor T1 having a gate electrode connected to an Nth scan line SCAN [n], and a second electrode of the driving transistor DT and a first electrode of a fourth transistor T4 commonly connected to each other. The first electrode is connected to the first electrode, and the second electrode is connected to the first node having the gate electrode of the driving transistor DT and the other end of the capacitor CST in common.

In the second transistor T2, a gate electrode is connected to the N-th scan line SCAN [n], a first electrode is connected to the second data line DL2, and the first and third transistors of the driving transistor DT are connected to each other. The second electrode is connected to a second node to which the first electrode of T3 is commonly connected.

In the third transistor T3, a first electrode is connected to a second node having a gate electrode connected to an emission signal line EM, and a second electrode of the second transistor T2 and a first electrode of the driving transistor DT commonly connected to each other. The second electrode is connected to the first power line VDDEL.

In the fourth transistor T4, a gate electrode is connected to the light emission signal line EM, a first electrode is connected to the second electrode of the driving transistor DT, and a second electrode is connected to the anode electrode of the organic light emitting diode OLED. do.

The fifth A transistor T5a has a gate electrode connected to the N-th scan line SCAN [n-1] (the front end of the N-th scan line), the other end of the capacitor CST, and the gate of the driving transistor DT. The first electrode is connected to the electrode, and the second electrode is connected to the first electrode of the 5B transistor T5b. In the fifth B transistor T5b, a gate electrode is connected to the Nth scan line SCAN [n-1], a first electrode is connected to the second electrode of the 5A transistor T5a, and the first voltage is connected to the initialization voltage line VINI. Two electrodes are connected. The common node of the fifth A transistor T5A and the fifth B transistor T5B is connected to the anode electrode of the organic light emitting diode included in the upper subpixel.

The driving transistor DT has a gate electrode connected to a first node in which a second electrode of the first transistor T1, the other end of the capacitor CST, and a first electrode of the 5A transistor T5a are connected in common, and the second transistor A first electrode is connected to a second node in which the second electrode of T2 and the first electrode of the third transistor T3 are connected in common, and the first electrode and the fourth transistor T4 of the first transistor T1 are connected to each other. The second electrode is connected to a third node to which the first electrode is commonly connected.

One end of the capacitor CST is connected to the first power line VDDEL and the second electrode of the third transistor T3, the first electrode of the 5A transistor T5a, the gate electrode of the driving transistor DT, and the first electrode of the capacitor CST. The other end is connected to the first node to which the second electrode of the transistor T1 is commonly connected.

In the organic light emitting diode OLED, an anode electrode is connected to the second electrode of the fourth transistor T4, and a cathode electrode is connected to the second power line VSSEL. An anode of the organic light emitting diode OLED is connected to a common node of a fifth A transistor T5A and a fifth B transistor T5B included in the green subpixel G at the bottom.

[Bottom green sub-pixel (G)]

In the first transistor T1, a gate electrode is connected to the N + 1 scan line SCAN [n + 1], and the second electrode of the driving transistor DT and the first electrode of the fourth transistor T4 are commonly used. The first electrode is connected to the connected third node, and the second electrode is connected to the first node to which the gate electrode of the driving transistor DT and the other end of the capacitor CST are commonly connected.

The second transistor T2 has a gate electrode connected to the N + 1 scan line SCAN [n + 1], a first electrode connected to the second data line DL2, and a first electrode of the driving transistor DT. And a second electrode connected to a second node to which the first electrode of the third transistor T3 is commonly connected.

In the third transistor T3, a first electrode is connected to a second node having a gate electrode connected to an emission signal line EM, and a second electrode of the second transistor T2 and a first electrode of the driving transistor DT commonly connected to each other. The second electrode is connected to the first power line VDDEL.

In the fourth transistor T4, a gate electrode is connected to the light emission signal line EM, a first electrode is connected to the second electrode of the driving transistor DT, and a second electrode is connected to the anode electrode of the organic light emitting diode OLED. do.

The fifth A transistor T5a has a gate electrode connected to the Nth scan line SCAN [n] (the front end of the Nth scan line, that is, the upper red subpixel), and the other end of the capacitor CST and the driving transistor. The first electrode is connected to the gate electrode of the DT and the second electrode is connected to the first electrode of the 5B transistor T5b. In the fifth B transistor T5b, a gate electrode is connected to an Nth scan line SCAN [n], a first electrode is connected to a second electrode of a 5A transistor T5a, and a second electrode is connected to an initialization voltage line VINI. This is connected. The common node of the fifth A transistor T5A and the fifth B transistor T5B is connected to the anode electrode of the organic light emitting diode OLED included in the red subpixel R at the upper end.

The driving transistor DT has a gate electrode connected to a first node in which a second electrode of the first transistor T1, the other end of the capacitor CST, and a first electrode of the 5A transistor T5a are connected in common, and the second transistor A first electrode is connected to a second node in which the second electrode of T2 and the first electrode of the third transistor T3 are connected in common, and the first electrode and the fourth transistor T4 of the first transistor T1 are connected to each other. The second electrode is connected to a third node to which the first electrode is commonly connected.

One end of the capacitor CST is connected to the first power line VDDEL and the second electrode of the third transistor T3, the first electrode of the 5A transistor T5a, the gate electrode of the driving transistor DT, and the first electrode of the capacitor CST. The other end is connected to the first node to which the second electrode of the transistor T1 is commonly connected.

In the organic light emitting diode OLED, an anode electrode is connected to the second electrode of the fourth transistor T4, and a cathode electrode is connected to the second power line VSSEL. The anode of the organic light emitting diode OLED is connected to a common node of a fifth A transistor and a fifth B transistor included in the subpixel at the bottom thereof.

As can be seen from the connection relationship between the upper red subpixel R and the lower green subpixel G, all the subpixels on the display panel are dependent between the upper and lower ends for the initialization of the organic light emitting diode OLED. Connection relationship can be established.

As shown in FIG. 9, the subpixels according to the embodiment operate in the order of an initialization period, an sampling period, and an emission period. During the initialization period, the first node of the driving transistor included in the subpixels is initialized. During the sampling period, threshold voltage sampling of the driving transistor included in the subpixels is performed. During the emission period, the emission operation of the organic light emitting diode included in the subpixels is performed.

A description will be given below regarding the operations performed during the initialization period, the sampling period, and the emission period based on the red subpixel R of FIGS. 9 and 8.

During the initialization period, the 5A and 5B transistors T5a and 5Tb (initialization transistors) are configured to scan the N-1th scan signal Scan [N-1 of the N-1th scan line SCAN [n-1]. ]). As the 5A and 5B transistors T5a and 5Tb are turned on, the initialization voltage Vini of the initialization voltage line VINI is transferred to the first node of the driving transistor DT included in the red subpixel R. As a result, the first node connected to the gate of the driving transistor DT is initialized by the initialization voltage.

During the sampling period, the first transistor T1 and the second transistor T2 are turned on by the Nth scan signal Scan [N] of the Nth scan line SCAN [n]. As the first transistor T1 is turned on, the driving transistor DT is connected to the gate electrode and the second electrode to be in a diode connection state. As the second transistor T2 is turned on, the data voltage is applied to the capacitor CST and the threshold voltage of the driving transistor DT is sampled.

In addition, the fifth and fifth B transistors T5a and 5Tb included in the green subpixel G positioned at the lower end of the red subpixel R are also turned on by the Nth scan signal Scan [N]. The reason is that the red subpixel R and the lower green subpixel G are connected in a dependent manner, and the first and second transistors T1 and T2 and the green subpixel G of the red subpixel R are connected. This is because the gate electrodes of the 5A and 5B transistors T5a and 5Tb are respectively connected to the Nth scan signal Scan [N].

As the 5A and 5B transistors T5a and 5Tb included in the green subpixel G are turned on, the initialization voltage Vini of the initialization voltage line VINI becomes the organic light emitting diode included in the red subpixel R. OLED) is delivered to the anode electrode. As a result, the light emitting diode OLED included in the red subpixel R is initialized at the same time as the sampling of the driving transistor DT.

During the emission period, the third transistor T3 and the fourth transistor T4 are turned on by the emission signal Em [n] of the Nth emission signal line EM [n]. As the third transistor T3 is turned on, the high potential voltage of the first power line VDDEL is applied to the driving transistor DT, and the driving transistor DT generates a driving current based on the data voltage. As the fourth transistor T4 is turned on, the driving current generated from the driving transistor DT flows through the anode electrode and the cathode electrode of the organic light emitting diode OLED to the second power line VSSEL. As a result, the organic light emitting diode OLED emits light.

Hereinafter, the difference between the experimental example and the Example will be described.

10 is a view for explaining the initialization and sampling method of the experimental example, Figure 11 is a view for explaining the initialization and sampling method of the embodiment, Figures 12 and 13 are views for explaining the advantages of the embodiment compared to the experimental example. .

As shown in FIG. 10, an experimental example has a structure in which gate electrodes of a first transistor T1, a second transistor T2, and a sixth transistor T6 are commonly connected to an Nth scan line SCAN [n]. Take

As a result, threshold voltage sampling is performed on the driving transistor DT of the red sub-pixel R by the first and second transistors T1 and T2 turned on. The organic light emitting diode OLED is initialized by the sixth transistor T6 which is turned on together with the organic light emitting diode OLED. That is, in the experimental example, the organic light emitting diode OLED is initialized when the sixth transistor T6 included in its subpixel is turned on.

As shown in FIG. 11, in the embodiment, the gate electrodes of the first transistor T1 and the second transistor T2 are connected to the Nth scan line SCAN [n], and the anode electrode of the organic light emitting diode OLED is connected. A structure connected to the common node of the fifth A transistor T5a and the fifth B transistor T5b existing in the next stage is taken.

As a result, threshold voltage sampling is performed on the driving transistor DT of the red subpixel R by the turned-on first and second transistors T1 and T2. The organic light emitting diode OLED is initialized by the fifth B transistor T5b turned on in the green subpixel G. That is, according to the exemplary embodiment, the organic light emitting diode OLED is initialized when the fifth B transistor T5b included in the next subpixel is turned on.

12 (a) shows the data voltage output of the data driver for driving the experimental example, and FIG. 12 (b) shows the data voltage output of the data driver for driving the embodiment.

As shown in FIGS. 3, 5, and 12 (a), according to the experimental example, the red data voltage R output through the first channel CH1 and the third channel CH3 of the data driver is green data. A data swing for changing the voltage G or the green data voltage G to the red data voltage R occurs.

On the other hand, as can be seen through Figs. 7, 8 and 12 (b), according to the embodiment, the data voltage output through the first to fourth channels (CH1 to CH4) of the data driver is each data line DL1 ~ Since it is fixed for each DL4), no data swing occurs. That is, the data driver continuously outputs the green data voltage, the red data voltage, and the blue data voltage through each of the channels CH1 to CH4, and does not perform data swing.

Therefore, the embodiment can reduce power consumption of the data driver compared to the experimental example.

FIG. 13A illustrates the size of the light emitting region EMA and the circuit region DRA HE1 and HD1 of the subpixel implemented based on the experimental example, and FIG. 13B illustrates the embodiment. The light emission area EMA and the circuit area DRA of the subpixel HE2 and HD2 are shown. The light emitting area EMA is an area in which an organic light emitting diode is disposed (also defined as an opening area), and the circuit area DRA is an area in which circuits for driving an organic light emitting diode, such as a driving transistor, are arranged.

As can be seen from the comparison of FIGS. 13A and 13B, according to the exemplary embodiment, the organic light emitting diode may be initialized without adding a separate transistor (T6 of FIG. 3). For this reason, the embodiment enables a layout in which the size HE2 of the light emitting area EMA can be increased instead of configuring the size HD2 of the circuit area DRA smaller than the experimental example.

Therefore, the embodiment can provide a structure (free space) that can increase the aperture ratio (opening area) of the subpixel compared to the experimental example or can be highly integrated to be suitable for high resolution.

As described above, the present invention implements a pentile subpixel structure capable of RGB independent driving based on a 6T (transistor) 1C (capacitor) inverse gamma internal compensation circuit, thereby achieving high integration and reducing driving power consumption in a high resolution model. .

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in every respect. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be understood that all changes or modifications derived from the meaning and scope of the claims and the equivalent concepts shall be included in the scope of the present invention.

T1: first transistor T2: second transistor
T3: third transistor T4: fourth transistor
T5a, T5b: fifth transistor DT: driving transistor
CST: Capacitor OLED: Organic Light Emitting Diode

Claims (12)

A display panel displaying an image; And
A driving unit driving the display panel;
The display panel of claim 1, wherein the organic light emitting diode of the first subpixel is initialized by a second subpixel disposed adjacent to the first subpixel. The method of claim 1,
The first subpixel is positioned at the Nth scan line.
And the second subpixel is positioned at an N + 1th scan line that is a next stage of the Nth scanline. The method of claim 2,
The first sub pixel and the second sub pixel
An electroluminescent display device having electrically connected nodes. The method of claim 1,
The anode electrode of the organic light emitting diode of the first subpixel is
And an electroluminescent display connected to the initialization transistor of the second subpixel. The method of claim 1,
The organic light emitting diode of the first sub pixel
During the period in which the threshold voltage of the driving transistor of the first subpixel is sampled.
And an electroluminescence display initialized by the initialization transistor of the second subpixel. The method of claim 1,
And a gate electrode connected to a first scan line of the first transistor and an initialization transistor of the second subpixel, the diode being connected to the driving transistor of the first subpixel. The method of claim 1,
The initialization transistor of the second subpixel is
A first initialization transistor having a gate electrode connected to a first scan line and a first electrode connected to a gate electrode of a driving transistor of the second subpixel;
And a second initialization transistor having a gate electrode connected to the first scan line, a first electrode connected to a second electrode of the first initialization transistor, and a second electrode connected to an initialization voltage line. The method of claim 1,
The first subpixel is connected to the first data line disposed on the left side and the second subpixel is connected to the second data line disposed on the right side, or vice versa. An electroluminescent display device connected to a line and connected to a second data line on the left side of the second sub-pixel. The method of claim 1,
The display panel
An electroluminescent display device comprising subpixels emitting the same color in an oblique direction with a data line therebetween. The method of claim 1,
The display panel
A first transistor having a gate electrode connected to the scan line, a first electrode connected to a second electrode of the driving transistor, and a second electrode connected to the gate electrode of the driving transistor;
A second transistor having a gate electrode connected to the scan line, a first electrode connected to a first data line, and a second electrode connected to a first electrode of the driving transistor;
A third transistor having a gate electrode connected to the emission signal line, a first electrode connected to the second electrode of the second transistor, a first electrode of the driving transistor, and a second electrode connected to the first power line;
A fourth transistor having a gate electrode connected to the light emitting signal line, a first electrode connected to a second electrode of the driving transistor, and a second electrode connected to an anode electrode of the organic light emitting diode;
A fifth A transistor having a gate electrode connected to a front end scan line positioned at the front end of the scan line, and a first electrode connected to the other end of the capacitor and the gate electrode of the driving transistor;
And a 5B transistor having a gate electrode connected to the front scan line, a first electrode connected to a second electrode of the 5A transistor, and a second electrode connected to an initialization voltage line. A first sub-pixel positioned on an Nth scan line and having a organic light emitting diode, a driving transistor supplying a driving current to the organic light emitting diode, and a first transistor for bringing the driving transistor into a diode connection state; A display panel including a second subpixel positioned at an N + 1th scan line and having an initialization transistor; And
A driving unit driving the display panel;
The initialization transistor of the second subpixel is turned on by an Nth scan signal supplied through the Nth scan line, and an initialization voltage supplied through an initialization voltage line to an anode electrode of the organic light emitting diode of the first subpixel. Electroluminescent display to transmit. The method of claim 11,
A first transistor of the first subpixel,
And a gate electrode connected to the Nth scan line.

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