KR102504235B1 - Free form display divice - Google Patents

Abstract

[0001] The present invention relates to a release display device capable of reducing a staircase-shaped viewing phenomenon, wherein a substrate having a release edge is arranged in a matrix manner in a region defined by intersections of gate lines and data lines inside the release border. Basic unit pixels each having a plurality of basic sub-pixels, basic unit pixels disposed adjacent to the anomaly border and auxiliary unit pixels disposed between the heteromorphic rim and having a plurality of auxiliary sub-pixels; a first auxiliary subpixel driver including a first organic light emitting diode disposed in each of the plurality of basic subpixels to emit light and a first thin film transistor to control an amount of current supplied to the first organic light emitting diode; a second auxiliary subpixel driver including a second organic light emitting diode disposed in each of the plurality of auxiliary subpixels to emit light and a second thin film transistor to control an amount of current supplied to the second organic light emitting diode; The auxiliary sub-pixel has a size smaller than that of the basic sub-pixel, and a second amount of current supplied from the second thin film transistor to the second organic light emitting diode corresponds to a second amount of current supplied from the first thin film transistor to the first organic light emitting diode. It is set less than 1 current amount.

Description

Release display device {FREE FORM DISPLAY DIVICE}

The present invention relates to a release display device, and more particularly, to a release display device capable of improving a phenomenon in which stairs in a release portion are visually recognized.

As the information society develops, demands for display devices for displaying images are increasing in various forms. For example, flat panel display devices (FPDs), which are thin, light, and capable of large areas, have been rapidly developed to replace bulky cathode ray tubes (CRTs). As such a flat panel display device, a liquid crystal display device (LCD), a plasma display panel (PDP), an organic light-emitting diode display (OLED), a field emission display device ( Various flat panel display devices such as a Field Emission Display Device (FED) and an Electrophoretic Display Device (ED) have been developed and used.

However, conventional flat panel display devices were developed with a focus on large screens, and since a display panel for displaying data is formed in a rectangular shape, it is unsuitable for use in applications requiring a special shape.

For example, in the case of display devices requiring various shapes such as round, elliptical, or oblique, such as wall-mounted clocks, wrist watches, and automobile dashboards, conventional rectangular display devices are inappropriate. Alternatively, a different shape display device such as a diagonal line is being developed.

Hereinafter, problems with the conventional display device will be described with reference to FIGS. 1 and 2 by referring to a conventional rectangular display device and a circular display device implemented according to a pixel arrangement applied thereto.

1 is a plan view schematically illustrating the structure of a partial area of a conventional rectangular display device. 2 is a plan view illustrating an edge structure of a circular display device implemented according to a prior art pixel arrangement.

Referring to FIG. 1 , a conventional display device includes rectangular unit pixels P arranged in a matrix manner on a rectangular substrate SUB. Also, each unit pixel P includes a plurality of subpixels SP. When red, green, and blue are the basic colors used when realizing full-color, a unit pixel (P) is composed of a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel (B). It can be.

When such a rectangular display device is applied to a circular, elliptical, curved or diagonal display device, the outline must have a circular, elliptical, curved or diagonal shape.

As shown in FIG. 2 , a heterogeneous display device having a circular, elliptical, curved, or oblique outline uses the same pixel structure as a conventional rectangular display device.

Referring to FIG. 2 , the circular display device has a circular disc-shaped substrate SUB. On the circular substrate SUB, rectangular unit pixels P are arranged in a matrix manner. However, since the unit pixels P are formed in a rectangular shape, a step shape is generated by an area where the unit pixels P are disposed and an area where the unit pixels P are not disposed. That is, pixels are not disposed between the outermost unit pixel P of the display area where data is displayed in the display device and the outer line of the substrate SUB, resulting in a dead zone, which is an area where data is not displayed. do. This dead zone allows the outline of the black matrix BM to be distinctly viewed in a stepped shape.

Therefore, there is a need to develop a release display device capable of improving display quality by reducing a step-like visibility phenomenon caused by a dead zone.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a release display device capable of reducing a step-like viewing phenomenon that may occur in a release display device.

In order to achieve the object of the present invention, a release display device is arranged in a matrix manner on a substrate having a release rim, and inside the release rim, a region partitioned by intersections of gate lines and data lines, each of which has a plurality of basic units. Basic unit pixels including pixels, basic unit pixels disposed adjacent to the irregular border and auxiliary unit pixels disposed between the irregular border and having a plurality of auxiliary sub-pixels, each of the plurality of basic sub-pixels A first auxiliary sub-pixel driver including a first organic light emitting diode disposed on and a first thin film transistor configured to control an amount of current supplied to the first organic light emitting diode, and each of the plurality of auxiliary sub-pixels and a second auxiliary subpixel driver including a second organic light emitting diode disposed to emit light and a second thin film transistor to control an amount of current supplied to the second organic light emitting diode, wherein the auxiliary subpixel comprises the basic part. It has a size smaller than that of a pixel, and a second amount of current supplied from the second thin film transistor to the second organic light emitting diode is set smaller than a first amount of current supplied from the first thin film transistor to the first organic light emitting diode.

In the configuration, the second amount of current is less than the first amount of current in proportion to the light emitting area of the auxiliary subpixel with respect to the light emitting area of the basic subpixel.

Also, the width of the second thin film transistor is set smaller than the width of the first thin film transistor in proportion to the ratio of the light emitting area of the auxiliary subpixel to the light emitting area of the basic subpixel.

Another release display device for achieving the object of the present invention is a substrate having a release rim, and inside the release rim, a region partitioned by intersections of gate lines and data lines is arranged in a matrix manner, each of a plurality of primary basic unit pixels including sub-pixels, basic unit pixels disposed adjacent to the irregular edge and auxiliary unit pixels disposed between the irregular border and including a plurality of auxiliary sub-pixels, the auxiliary sub-pixels comprising: The gray level of data supplied to the auxiliary sub-pixel is adjusted based on a gamma curve so that the auxiliary sub-pixel and the basic sub-pixel may have the same luminance and have a size smaller than that of the basic sub-pixel.

In the above configuration, if the area of the light emitting part of the auxiliary sub-pixel is m times the area of the light emitting part of the basic sub-pixel (0 < m < 1), gamma g (g is a constant determined according to the display panel) and the expression (1/m ) ^1/g is multiplied by the data supplied to the auxiliary sub-pixel to change the grayscale value of the auxiliary sub-pixel.

According to the release display device according to the present invention, an auxiliary sub-pixel having a smaller size than the basic sub-pixel is disposed in the dead zone formed on the release edge portion, and the width of the driving TFT provided therein is adjusted. It is possible to obtain an effect capable of removing color splashing, color modulation, and partial brightness occurring in the part.

In addition, by adjusting the gradation of data supplied to auxiliary sub-pixels disposed in the dead zone formed in the deformed edge portion according to the gamma curve, color splashing, color modulation, and partial brightness occurring at the deformed edge portion can be eliminated. possible effect can be obtained.

1 is a plan view schematically illustrating a part of an edge area of a conventional rectangular display device;
2 is a plan view schematically showing a partial border area of a circular display device implemented according to a prior art pixel arrangement;
3 is a schematic configuration diagram of a release display device according to an embodiment of the present invention;
4 is a plan view showing a first example of a partial border area of the active area shown in FIG. 3;
5 is a plan view showing a second example of a partial border area of the active area shown in FIG. 3;
6 is an equivalent circuit diagram of a first example showing a partial area of a pixel array including a basic unit pixel (PA) and an auxiliary unit pixel (PB) of the heterogeneous display device shown in FIG. 5;
7 is an equivalent circuit diagram of a second example showing a partial area of a pixel array including a basic unit pixel (PA) and an auxiliary unit pixel (PB) of the heterogeneous display device shown in FIG. 5;
8 is a plan view showing a third example of a partial border area of the active area shown in FIG. 3;
9 is a graph showing a gamma 2.2 curve;

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Like reference numbers throughout the specification indicate substantially the same elements. In the following description, if it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

In the detailed description of the present invention, the term "free form" means a non-rectangular shape such as a circle, an ellipse, a triangle, a polygon, etc. in which sub-pixels disposed in a pixel array cannot be disposed in the same size at the edge portion. , In the following description of the embodiment, the case of a circular shape will be described as an example.

Hereinafter, a release display device according to an exemplary embodiment of the present invention will be described with reference to FIG. 3 .

3 is a schematic configuration diagram of a release display device according to an embodiment of the present invention.

Referring to FIG. 3 , a release display device according to an embodiment of the present invention includes a display driving circuit and a display panel.

The display panel includes an active area AA where data is displayed and a bezel area outside the active area AA.

The active area AA includes data lines DL and gate lines GL disposed to cross each other, and pixels 10 disposed in an area defined in a matrix form by the intersections of the data lines DL and gate lines GL.

The active area AA further includes a high-potential power supply line and a low-potential power supply line respectively supplying the high-potential power supply voltage VDD and the low-potential power supply voltage VSS to the pixels 10 . The gate lines GL supply scan pulses to the pixels 10 . The data lines DL supply data voltages to the pixels 10 .

Each of the pixels 10 is divided into a red sub-pixel, a green sub-pixel, and a blue sub-pixel for color implementation. Each of the pixels 10 may further include a white sub-pixel.

Each of the pixels 10 and each sub-pixel includes an organic light emitting diode (OLED), a driving thin film transistor (hereinafter referred to as “TFT”) (DT) that controls the amount of current flowing through the organic light emitting diode (OLED), and driving A programming unit (SC) for setting the gate-source voltage of the TFT (DT) is included. The programming unit SC may include at least one switching TFT and at least one storage capacitor. The switching TFT is turned on in response to a scan pulse from the gate line GL, thereby applying the data voltage supplied from the data line DL to one electrode of the storage capacitor. The driving TFT (DT) controls the amount of current supplied to the organic light emitting diode (OLED) according to the level of the voltage charged in the storage capacitor to adjust the luminous intensity of the organic light emitting diode (OLED). The luminous intensity of the organic light emitting diode (OLED) is proportional to the amount of current supplied from the driving TFT (DT). Luminance is the luminous intensity divided by the area. Each of these sub-pixels is connected to a high-potential power line and a low-potential power line, and receives a high-potential power supply (VDD) and a low-potential power supply (VSS) from a power generator (not shown), respectively. Thin film transistors constituting each sub-pixel may be implemented as p-type or n-type. In addition, the semiconductor layer of the thin film transistors constituting each subpixel may include amorphous silicon, polysilicon, or oxide. The organic light emitting diode (OLED) includes an anode electrode (ANO), a cathode electrode (CAT), and an organic compound layer interposed between the anode electrode (ANO) and the cathode electrode (CAT). The anode electrode ANO is connected to the driving TFT DT.

The bezel area is disposed outside the active area AA. The bezel area may include a multiplexer (160) and a gate driving circuit (GIC) 120.

The display driving circuit includes a gate driving circuit 120, a data driving circuit 140, and a timing controller 30, and writes video data voltages of an input image into the pixels 10.

The data driving circuit 140 converts the digital video data RGB input from the timing controller 30 into an analog gamma compensation voltage to generate a data voltage. The data voltage output from the data driving circuit 140 is supplied to the data lines DL.

The data driving circuit 140 may be mounted on a flexible circuit board and electrically connected to a pad part disposed in the bezel area through an anisotropic conductive film (ACF). The flexible printed circuit board may be bent toward the rear surface of the display panel, and at this time, the data driving circuit 140 may be positioned on the rear surface of the display panel.

The multiplexer 160 distributes the data voltage supplied from the data driving circuit 140 to the data lines DL. The multiplexer 160 time-divisionally distributes the data signal output from one output terminal of the data driving circuit 140 to a plurality of data lines DL in response to the multiplex enable signal. Accordingly, the number of output terminals of the data driving circuit 140 and data routing lines connected thereto can be reduced.

The gate driving circuit 120 sequentially supplies scan pulses synchronized with the data voltage to the gate lines GL to select pixels of the display panel 110 to which the data voltage is written.

The gate driving circuit 120 may be respectively disposed in bezel areas on both sides of the active area AA as a center. However, the present invention is not limited thereto, and may be disposed in either bezel area. The gate driving circuit 120 may divide the gate lines GL into predetermined groups and supply scan pulses for each divided group.

The gate driving circuit 120 includes a shift register. A shift register contains cascadingly connected stages. The stages output scan pulses in response to the start pulse GSP, and shift outputs of the scan pulses according to shift clocks GCLK1 to GCLK4. The gate driving circuit 120 may be directly disposed on the bezel area of the display panel in a gate-driver in panel (GIP) method.

The timing controller 30 inputs timing signals such as a vertical sync signal (Vsync), a horizontal sync signal (Hsync), a data enable signal (Data Enable, DE), and a main clock (MCLK) input from the host system 20. operation timings of the data driving circuit 140 and the gate driving circuit 120 are synchronized. The data timing control signal for controlling the data driving circuit 140 includes a source sampling clock (SSC), a source output enable signal (SOE), and the like. Gate timing control signals for controlling the gate driving circuit 120 include a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (Gate Output Enable (GOE)), and the like. includes

The host system 20 may be implemented as any one of a television system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. The host system 20 includes a system on chip (SoC) with a built-in scaler to convert digital video data (RGB) of an input image into a format suitable for display on the display panel 110 . The host system 20 transmits timing signals Vsync, Hsync, DE, and MCLK together with digital video data to the timing controller 30.

The release display device according to the above-described embodiment of the present invention displays an image by arranging pixels each including an organic light emitting diode in a matrix form and adjusting the luminance of the organic light emitting diode according to the gray level of image data. do.

Each of the pixels 10 of the release display device according to the present invention is a driving element that controls the current flowing through the organic light emitting diode (OLED) according to the voltage applied between the gate electrode and the source electrode, that is, a driving TFT (Thin Film Transistor) ( DT) included. Since electrical characteristics of the light emitting diode (OLED) and the driving TFT (DT) deteriorate over time, differences may occur between pixels. Therefore, a sensing circuit for compensating for the electrical characteristic deviation between these pixels may be included in the data driving circuit 140 (see FIG. 3 ).

The data driving circuit 140 senses the electrical characteristics of the pixels 10 (eg, the threshold voltage of the driving TFT, the mobility of the driving TFT, the threshold voltage of the light emitting diode (OLED)), and the corresponding digital sensing Data is transmitted to the timing controller (30).

The timing controller 30 calculates a compensation value capable of eliminating the electrical characteristic deviation based on digital sensing data, modulates image data with the compensation value, and outputs the modulated data to the data driving circuit 140. can

The data driving circuit 140 converts the modulated data into an analog data voltage and supplies it to the pixels, so that an image in which electrical characteristic deviation between pixels is compensated can be implemented on the display panel.

Next, referring to FIGS. 4 and 5 , an edge portion of a release display device according to an exemplary embodiment of the present invention will be described in more detail.

FIG. 4 is a plan view showing a first example of a partial border area of the active area shown in FIG. 3 , and FIG. 5 is a plan view showing a second example of a partial border area of the active area shown in FIG. 3 .

Referring to FIG. 4 , the release display device according to the present invention has a release substrate SUB. The release substrate SUB is divided into a display area and a non-display area by the curved edge of the black matrix BM. On the release substrate SUB, in the display area, the basic unit pixels PA and the auxiliary unit pixels PB are arranged in a matrix manner.

The basic unit pixel PA includes all sub-pixels SPL, which are basic units expressing colors. For example, if you want to implement red, green, and blue as the basic colors used when realizing full-color, the basic unit pixel (PA) includes a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel. It consists of (B).

Meanwhile, the auxiliary unit pixel PB is smaller than the basic unit pixel PA.

In a structure in which pixels are arranged in a matrix manner in which rows and columns are arranged, one auxiliary unit pixel PB may be disposed at a left or right end of the basic unit pixels PA. However, auxiliary unit pixels PB are not arranged in all rows. For example, only basic unit pixels PA may be arranged in a pixel row corresponding to the diameter of the heterogeneous shape.

It is preferable that the auxiliary unit pixels PB are arranged in columns at both ends of the basic unit pixels PAs in the pixel row.

For example, the auxiliary unit pixel PB disposed in a portion where the curvature of the dead zone DZ is relatively small may include only the green sub-pixel G and the blue sub-pixel B. In addition, the auxiliary unit pixel PB disposed in a portion of the dead zone DZ having a relatively large curvature may include only the blue sub-pixel B.

In the heterogeneous display device according to the display device of the present invention, the ratio occupied by the dead zone DZ is much reduced compared to the heterogeneous display device having only the basic unit pixels due to the auxiliary unit pixels. Accordingly, the edge portion of the release display device can be expressed more smoothly and naturally.

A circular display device according to the present invention has a release substrate (SUB). The release substrate SUB is divided into a display area and a non-display area by the curved edge of the black matrix BM. On the release substrate SUB, in the display area, the basic unit pixels PA and the auxiliary unit pixels PB are arranged in a matrix manner.

Both the basic unit pixel PA and the auxiliary unit pixel PB include sub-pixels SPL, which are basic units expressing colors. For example, if you want to implement red, green, and blue as the basic colors used when realizing full-color, the basic unit pixel (PA) includes a basic red sub-pixel (R), a basic green sub-pixel (G), and a basic unit pixel (PA). It is composed of blue sub-pixels (B).

Meanwhile, the auxiliary unit pixel PB is composed of an auxiliary red sub-pixel SR, an auxiliary green sub-pixel SG, and an auxiliary blue sub-pixel SB vertically arranged to implement a basic color. For example, when the basic sub-pixels SPL can be sufficiently disposed in the dead zone DZ between the edge of the release substrate SUB and the basic unit pixel PA, auxiliary red color within the dead zone DZ. An auxiliary unit pixel PB including a sub-pixel SR, an auxiliary green sub-pixel SG, and an auxiliary blue sub-pixel SB is constituted.

Accordingly, in a structure in which pixels are arranged in a matrix manner having rows and columns, auxiliary unit pixels PB may be disposed at left ends, right ends, or both ends of the basic unit pixels PA. However, auxiliary unit pixels PB are not arranged in all rows. For example, only basic unit pixels PA may be arranged in a pixel row corresponding to the diameter of the heterogeneous shape.

It is preferable that the auxiliary unit pixels PB are disposed at both ends of the basic unit pixels PAs in the pixel row.

For example, the auxiliary unit pixel PB disposed in a portion where the curvature of the dead zone DZ is relatively small has a size corresponding to the size of the two sub-pixels SPL constituting the basic unit pixel PA. . That is, the auxiliary unit pixel PB may have the same size as the sum of the basic green subpixel G and the basic blue subpixel B. In this case, the auxiliary red sub-pixel SR, auxiliary green sub-pixel SG, and auxiliary blue sub-pixel SB are vertically aligned in the auxiliary unit pixel PB. More specifically, each of the auxiliary red sub-pixel (SR), auxiliary green sub-pixel (SG), and auxiliary blue sub-pixel (SB) includes a basic green sub-pixel (G) and a basic blue sub-pixel (B). has a size 1/3 times the size of the two sub-pixels (SPL), and is continuously arranged in the sub-pixel column direction.

In addition, the auxiliary unit pixel PB disposed in a portion where the curvature of the dead zone DZ is relatively large has a size corresponding to the size of one sub-pixel SPL constituting the basic unit pixel PA. That is, the auxiliary unit pixel PB may have the same size as the basic blue sub-pixel B. In this case, within the auxiliary unit pixel PB, the auxiliary red subpixel SR, the auxiliary green subpixel SG, and the auxiliary blue subpixel SB are vertically aligned. More specifically, each of the auxiliary red sub-pixel (SR), auxiliary green sub-pixel (SG) and auxiliary blue sub-pixel (SB) has a size 1/3 times the size of the basic blue sub-pixel (B), They are sequentially arranged in the pixel column direction.

In the above, only the case where the unit pixel is composed of three sub-pixels has been described. However, the concept of the present invention can be applied as it is even when it is composed of more sub-pixels. For example, when a unit pixel is configured with n subpixels, the basic unit pixel PA includes n subpixels. Meanwhile, the auxiliary unit pixel PB may have a size corresponding to any one of 1/n to (n−1)/n multiples of the size of the basic unit pixel PA.

For example, when n is 3, the auxiliary unit pixel PB may have a size 1/3 times or 2/3 times the size of the basic unit pixel PA. When n is 4, the auxiliary unit pixel PB may have a size 1/4, 2/4, or 3/4 times the size of the basic unit pixel PA. That is, the size of one auxiliary unit pixel may be selected from one of 1/n to (n−1)/n of the size of one basic unit pixel.

Similarly, each of the second subpixels SR, SG, and SB constituting the auxiliary unit pixel PB has a size of 1 of the size of the first subpixels R, G, and B constituting the basic unit pixel PA. It may have a size corresponding to any one of /n to (n-1)/n multiples.

For example, when n is 3, the size of the second subpixels SR, SG, and SB may be 1/3 times or 2/3 times the size of the first subpixel SPL. When n is 4, the size of the second subpixels SR, SG, and SB may be 1/4, 2/4, or 3/4 times the size of the first subpixel SPL.

According to the release display device according to the embodiment of FIG. 5 , a natural release border can be implemented by minimizing empty space at the edge portion and a uniform gradation can be displayed.

Hereinafter, with reference to FIGS. 6 and 7 , the basic unit pixel PA and the auxiliary unit pixel PB of the release display device according to the exemplary embodiment of FIG. 5 will be described in more detail.

6 is an equivalent circuit diagram of a first example showing a partial area of a pixel array including a basic unit pixel PA and an auxiliary unit pixel PB of the heterogeneous display device shown in FIG. 5, and FIG. 7 is an equivalent circuit diagram shown in FIG. An equivalent circuit diagram of the second example showing a partial area of the pixel array including the basic unit pixel PA and the auxiliary unit pixel PB of the release display device.

Referring to FIG. 6 , the pixel array of the release display device according to the present invention includes a basic unit pixel (PA) and an auxiliary unit pixel (PB).

The basic unit pixel PA includes a basic red sub-pixel R, a basic green sub-pixel G, and a basic blue sub-pixel B continuously disposed along the gate line GL.

The auxiliary unit pixel PB is disposed at the left end, the right end, or both ends of the basic unit pixel PA disposed at the edge in one pixel row. The auxiliary unit pixel PB includes an auxiliary red sub-pixel SR, an auxiliary green sub-pixel SG, and an auxiliary blue sub-pixel SB connected to the gate line GL to which the basic unit pixel PA is connected. These are disposed along the arrangement direction of the data line DL. In particular, they are disposed within a size corresponding to one first subpixel area.

Each of the subpixels (R, G, B, SR, SG, SB) constituting the basic unit pixel (PA) and the auxiliary unit pixel (PB) includes two switching thin film transistors (ST1, ST2) and one driving thin film transistor. It has a 3T1C (three transistors, one capacitor) structure including a (DT) and an organic light emitting diode (OLED). However, the pixel driving circuit according to the embodiment of the present invention is not limited to the 3T1C structure, and any structure using a method of controlling the current flowing through the organic light emitting diode (OLED) using the driving TFT is an embodiment of the present invention. It should be understood that it can be applied to a release display device according to.

Each of the subpixels R, G, B, SR, SG, and SB includes a first switching TFT ST1, a driving TFT DT, a storage capacitor Cst, an organic light emitting diode OLED, and a second switching TFT ( ST) may be included. The first switching TFT (ST1) supplies the data voltage of the data line (DL) to the driving TFT (DT) in response to the scan pulse of the gate line (GL). To this end, the same gate line is connected to the first switching TFT ST1 of the basic sub-pixels R, G, and B and the first switching TFT ST1 of the auxiliary sub-pixel SB, and the auxiliary sub-pixel SR, Another gate line is connected to the first switching TFT (ST1) of SG).

The driving TFT (DT) can control the current flowing through the organic light emitting diode (OLED) according to the data voltage applied to the gate electrode. To this end, the driving TFT (DT) receives a high potential voltage (VDD) through a high potential voltage line. The storage capacitor Cst stores the difference voltage between the gate electrode of the driving TFT DT and the low potential voltage VSS supplied through the low potential voltage line and maintains it constant for one frame period. The organic light emitting diode (OLED) is connected between the low potential voltage line and the source electrode of the driving TFT (DT). The second switching TFT (ST2) switches to supply the reference voltage (Vref) supplied from the reference voltage line.

Referring to FIG. 7 , different data lines DL, DL, and DL are connected to the first switching TFT ST1 of each of the auxiliary sub-pixels SR, SG, and SB, and the auxiliary sub-pixels SR and SG , SB) It is the same as the equivalent circuit diagram of FIG. 6 except that the same gate line GL is connected to the gate electrode of each first switching TFT ST1. Therefore, a detailed description thereof is omitted.

In the equivalent circuit diagram of FIG. 7 , it has been described that the auxiliary subpixels SR, SG, and SB share a gate line, but, unlike this, it is possible to configure a gate line connected to each of the auxiliary subpixels differently.

In the embodiment of FIG. 6 , the auxiliary basic pixel PB can implement white, whereas in the embodiment of FIG. 7 , since different data is supplied to each of the auxiliary sub-pixels SR, SG, and SB, the auxiliary basic pixel The difference is that (PB) can display data.

According to the above-described release display device, when the basic unit pixel PA exhibits a white gradation, the auxiliary basic pixel PB may also exhibit the same white gradation, so a white band may be expressed along the edge curve of the release display device. When used, perfect white gradation can be displayed, and color splashing or color modulation does not occur.

However, in the above-described heterogeneous display device, although the size of each of the auxiliary sub-pixels SR, SG, and SB is 1/3 of the size of each of the basic sub-pixels R, G, and B, the basic sub-pixels R, When the size of the first driving TFT DT1 provided in each of G and B and the second driving TFT DT2 provided in each of the auxiliary sub-pixels SR, SG, and SB are the same, the organic light emitting diode (OLED) ) increases in intensity of emitted light in proportion to the amount of current output from the first driving TFT (DT1) and the second driving TFT (DT2). Therefore, the intensity of light emitted from each of the auxiliary sub-pixels SR, SG, and SB feels three times greater than the intensity of light emitted from each of the basic sub-pixels R, G, and B, so that the edge portion is displayed brighter. brightness will occur.

Such a partial brightness phenomenon in the edge portion affects the width or length of the first driving TFT DT1 and the second driving TFT DT2 in the basic subpixels R, G, and B and the auxiliary subpixels SR. , SG, SB) can be solved by adjusting in proportion to the area of the light emitting part.

For example, in the embodiments of FIGS. 5 and 6 , the area of the light emitting area of each of the basic sub-pixels R, G, and B is three times the area of the light emitting area of each of the auxiliary sub-pixels SR, SG, and SB. In this case, the width of the second driving TFT (DT2) is 1/3 of the width of the first driving TFT (DT1) or the length of the second driving TFT (DT2) is three times the length of the first driving TFT (DT1). In this case, since the luminance (luminous intensity per unit area) can be made the same, an effect of removing a partial brightness phenomenon can be obtained.

Therefore, in the release display device according to the present invention, the width of the second driving TFT provided in the auxiliary subpixel is set smaller than the width of the first driving TFT in proportion to the ratio of the light emitting area of the auxiliary subpixel to the light emitting area of the basic subpixel. It should be.

Unlike this, in the release display device according to the present invention, the length of the second driving TFT included in the auxiliary subpixel is greater than the width of the first driving TFT in proportion to the ratio of the light emitting area of the auxiliary subpixel to the light emitting area of the basic subpixel. may be set.

As described above, in the release display device according to an embodiment of the present invention, an auxiliary subpixel having a size smaller than that of the basic subpixel is disposed in a dead zone formed on the release edge portion, and the width or length of the driving TFT provided therein is set. By adjusting, it is possible to obtain an effect capable of removing color splashing, color modulation, and partial brightness occurring in the conventional molded edge portion.

Next, a third example of an edge portion of a release display device according to an embodiment of the present invention will be described in more detail with reference to FIG. 8 .

FIG. 8 is a plan view illustrating a third example of a partial border area of the active area shown in FIG. 3 .

In a third example of the edge area of the release display device according to the exemplary embodiment of FIG. 8 , the auxiliary unit pixels PB disposed in the dead zone DZ have the same arrangement direction as the basic unit pixels PA, and their size is The edge area of the release display device according to the exemplary embodiment of FIG. 6 is the same as the second example except that it is small. Therefore, further description is omitted to avoid redundant description.

In the above-described embodiment of the present invention, various problems occurring in the edge portion are solved by adjusting the width or length of the second driving TFT provided in the auxiliary subpixel. You may.

This will be described with reference to FIG. 9 . 9 is a graph showing a gamma 2.2 curve.

As shown in FIG. 9 , in the case of a general gamma 2.2 display, luminance is proportional to the 2.2 power of grayscale. A gamma of 2.4 is sometimes used.

Therefore, if the area of the light emitting part of the auxiliary sub-pixel is m times the area of the light emitting part of the basic sub-pixel (0 < m < 1), adjusting the gray level to m ^1/2.2 times the area of the light emitting part of the basic sub-pixel adjusts the width or length of the driving TFT. Even if this is not done, the luminance of the auxiliary sub-pixel may be maintained equal to that of the basic sub-pixel. For example, if the area of the light emitting part of the auxiliary sub-pixel is 1/3 of the area of the light emitting part of the basic sub-pixel, if the gray level is adjusted by 0.61 times through the calculation formula of (1/3) ^1/2.2 , the auxiliary sub-pixel and the basic part The luminance of the pixels may be set to be the same.

A function of converting the gamma characteristics of RGB image data to conform to the gamma 2.2 curve and a technology of performing color correction of RGB image data using a color correction matrix have already been disclosed through Korean Patent Publication No. 10-2004-0041930 and the like. Since it is known, a detailed description thereof is omitted in the present invention to avoid redundant description.

Therefore, by adjusting the gradation of the data supplied to the auxiliary subpixels disposed in the dead zone formed in the deformed edge portion according to the gamma 2.2 curve, the luminance emitted from the primary subpixel and the luminance emitted from the auxiliary subpixel can be matched. It is possible to obtain an effect capable of removing color splashing, color modulation, and partial brightness occurring at the molded edge portion.

Through the above description, those skilled in the art will understand that various changes and modifications are possible without departing from the spirit of the present invention. For example, in the embodiment of the present invention, an example in which each sub-pixel is composed of 2T1C has been mainly described, but the present invention is not limited thereto. For example, a 6T1C structure may be applied to sub-pixels of a heterogeneous display device according to an embodiment of the present invention. In this case, the TFT whose width or length is adjusted is another switching TFT capable of directly controlling the current supplied to the organic light emitting diode (OLED) as well as the driving TFT (for example, turning on or off the current passing through the driving TFT). TFT) should also be included. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

AA: active area BA: bezel area
PA: Basic unit pixel PB: Sub unit pixel
R: Basic red sub-pixel G: Basic green sub-pixel
B: primary blue sub-pixel SR: secondary red sub-pixel
SG: Sub-green sub-pixel SB: Sub-blue sub-pixel
DT, DT1, DT2: Driving TFT ST: Switching TFT
OLED: organic light emitting diode

Claims (9)

a substrate with a release edge;
basic unit pixels arranged in a matrix manner in an area partitioned by intersections of gate lines and data lines inside the shaped border, each having a plurality of basic sub-pixels; and
a basic unit pixel disposed adjacent to the irregular border and auxiliary unit pixels disposed between the irregular border and having a plurality of auxiliary sub-pixels;
The plurality of basic subpixels are arranged in a first direction, and the plurality of auxiliary subpixels are arranged in a second direction crossing the first direction. According to claim 1,
a first auxiliary subpixel driver including a first organic light emitting diode disposed in each of the plurality of basic subpixels to emit light and a first thin film transistor to control an amount of current supplied to the first organic light emitting diode; and
a second auxiliary subpixel driver including a second organic light emitting diode disposed in each of the plurality of auxiliary subpixels to emit light and a second thin film transistor to control an amount of current supplied to the second organic light emitting diode; ,
The auxiliary sub-pixel has a smaller size than the basic sub-pixel;
When displaying a uniform image, a second amount of current supplied from the second thin film transistor to the second organic light emitting diode is less than a first amount of current supplied from the first thin film transistor to the first organic light emitting diode;
The second amount of current is smaller than the first amount of current in proportion to the light emitting area of the auxiliary subpixel with respect to the light emitting area of the basic subpixel. According to claim 2,
A width of the second thin film transistor is set smaller than a width of the first thin film transistor in proportion to a ratio of a light emitting area of the auxiliary subpixel and a light emitting area of the basic subpixel. According to any one of claims 1 to 3,
When the number of basic subpixels belonging to one basic unit pixel is n (n is a natural number greater than or equal to 2), the size of one auxiliary unit pixel is 1/n to (n-1)/n of the size of one basic unit pixel. Any one of the heterogeneous display devices. According to claim 1,
and adjusting the gray level of data supplied to the auxiliary sub-pixel based on a gamma 2.2 curve so that the same amount of light emission can be obtained from the auxiliary sub-pixel and the basic sub-pixel. According to claim 5,
If the area of the light emitting part of the auxiliary sub-pixel is m times (0 < m < 1) the area of the light emitting part of the basic sub-pixel, according to the equation (1/m) ^1/g (g is a constant determined according to the display panel) and changing the grayscale value of the auxiliary sub-pixel by multiplying the obtained value by data supplied to the auxiliary sub-pixel. According to claim 1,
The plurality of auxiliary sub-pixels include a first auxiliary sub-pixel, a second auxiliary sub-pixel, and a third auxiliary sub-pixel;
The same gate line is connected to the switching thin film transistors of the plurality of basic sub-pixels and the switching thin film transistors of the third auxiliary sub-pixel, and different gate lines are connected to the switching thin-film transistors of the first and second auxiliary sub-pixels. display device. According to claim 1,
Different data lines are connected to the switching thin film transistor of each of the plurality of auxiliary sub-pixels, and the same gate line is connected to a gate electrode of the switching thin film transistor of each of the plurality of auxiliary sub-pixels. a substrate with a release edge;
basic unit pixels arranged in a matrix manner in an area partitioned by intersections of gate lines and data lines inside the shaped border, each having a plurality of basic sub-pixels; and
a basic unit pixel disposed adjacent to the irregular border and auxiliary unit pixels disposed between the irregular border and having a plurality of auxiliary sub-pixels;
An auxiliary unit pixel disposed in a portion having a relatively small curvature of a dead zone where data is not displayed because the basic unit pixels are not disposed is composed of only a green sub-pixel and a blue sub-pixel;
An auxiliary unit pixel disposed in a portion of the dead zone having a relatively large curvature includes only blue sub-pixels.

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