KR20070103831A - Display device - Google Patents

Abstract

A display device is provided to prevent the disconnection of a data line while forming the data line thin, and to define various dots by arranging imaging signals according to the dots. A display device includes a first pixel, a second pixel, a scan line(121b), a first data line(171a), and a second data line(171b). The first pixel displays a first color. The second pixel displays a second color. The scan line(121b) is connected to the first pixel and the second pixel, and transmits a scan signal. The first data line(171a) includes an expanding unit connected to the first pixel, and transmits a first data voltage for the first pixel. The second data line(171b) is formed parallel to the first data line(171a), includes a curved part which surrounds the expanding unit, and transmits a second data voltage for the second pixel by being connected with the second pixel.

Description

Display device {DISPLAY DEVICE}

1 is a block diagram of an organic light emitting diode display according to an exemplary embodiment of the present invention.

2 is an equivalent circuit diagram of a pixel of an organic light emitting diode display according to an exemplary embodiment of the present invention.

3 is a plan view illustrating a plurality of pixels of an organic light emitting diode display according to an exemplary embodiment of the present invention.

4, 5, and 6 are cross-sectional views taken along lines IV-IV, V-V, and VI-VI of FIG. 3.

7A and 7B are signal waveform diagrams illustrating an operation of an organic light emitting diode display according to an exemplary embodiment of the present invention.

The present invention relates to a display device.

Recently, flat panel display devices that can replace cathode ray tubes (CRTs) have been actively researched. In particular, organic light emitting display devices are attracting attention as next-generation flat panel display devices due to their excellent luminance and viewing angle characteristics.

In general, in an active flat panel display, a plurality of pixels are arranged in a matrix form, and an image is displayed by controlling the light intensity of each pixel according to given luminance information. The organic light emitting diode display is a display device that displays an image by electrically exciting the fluorescent organic material. The organic light emitting diode display is self-luminous, has low power consumption, and has a fast response time of pixels, thereby easily displaying high quality video.

The organic light emitting diode display includes an organic light emitting diode (OLED) and a thin film transistor (TFT) driving the organic light emitting diode (OLED). The thin film transistor is classified into a polysilicon thin film transistor and an amorphous silicon thin film transistor according to the type of the active layer. The organic light emitting diode display employing the polysilicon thin film transistor has many advantages, and thus is widely used. However, the manufacturing process of the thin film transistor is complicated and thus the cost increases. In addition, it is difficult to obtain a large screen with such an organic light emitting display device. On the other hand, an organic light emitting diode display employing an amorphous silicon thin film transistor is easy to obtain a large screen and has a relatively smaller manufacturing process than an organic light emitting diode display employing a polysilicon thin film transistor.

The organic light emitting diode display includes a plurality of pixels representing one dot, and the organic light emitting layer of each pixel emits light of different colors, and the color of one dot is determined by the combination of these lights.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an organic light emitting diode display which can be driven at a high speed while easily combining different lights represented by a plurality of pixels.

According to an embodiment of the present invention, a display device is connected to a first pixel displaying a first color, a second pixel displaying a second color, the first pixel, and the second pixel. A scan line for transmitting a scan signal, an extension part connected to the first pixel, a first data line for transmitting a first data voltage for the first pixel, and a first data line parallel to the first data line; And a second data line connected to the second pixel to transfer the second data voltage for the second pixel.

The scan line may intersect between the first pixel and the second pixel and be connected to the first pixel and the second pixel.

The first pixel and the second pixel may face each other with respect to the scan line.

A third pixel connected to the scan line and symmetrically formed with respect to the first pixel based on the first and second data lines, the third pixel displaying a third color, and connected to the scan line; And an extension part formed symmetrically with the second pixel with respect to a second data line, the fourth pixel displaying a fourth color and an extension part connected to the third pixel, and including the third data for the third pixel. And a third data line for transmitting a voltage, and a bent portion surrounding the extension of the third data line, and further comprising a fourth data line connected to the fourth pixel to transmit a fourth data voltage for the fourth pixel. can do.

Each pixel may include a source electrode connected to the data line, a drain electrode facing the source electrode, an organic layer formed on the source electrode and the drain electrode, and having a contact hole for exposing the drain electrode. And a pixel electrode formed on the film and connected to the drain electrode through the contact hole, a light emitting member formed on the pixel electrode, and a common electrode formed on the light emitting member.

The drain electrodes of the first and third pixels may be connected to the first data line and the third drain electrode, respectively, through a connection part.

The extension part of the first data line and the bent part of the second data line extend toward the first pixel, and the extension part of the third data line and the bend part of the fourth data line extend toward the third pixel. There may be.

The pixel electrode of the first pixel may be chamfered along the bent portion of the second data line, and the pixel electrode of the third pixel may be chamfered along the bent portion of the fourth data line.

The light emitting members of the first to fourth pixels may emit white light.

The organic layer of the first to third pixels may include a color filter representing one of the first to third colors.

The color filter may represent one of red, green, and blue colors.

The first to fourth pixels may form one dot.

The first pixel and the third pixel connected to the current scan line and the second pixel and the fourth pixel connected to the previous scan line may form one dot.

When a scan signal is supplied to the current scan line, the first data voltage and the third data voltage are supplied to the first pixel and the third pixel of a previous dot, respectively, and the second pixel and the first pixel of the current dot are supplied. The second data voltage and the fourth data voltage may be supplied to four pixels, respectively.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

A display device according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

1 is a block diagram of an organic light emitting diode display according to an exemplary embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram of a pixel of the organic light emitting diode display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, an organic light emitting diode display according to an exemplary embodiment of the present invention includes a display panel 300, a scan driver 400 connected to the display panel 300, a data driver 500, and a data driver 500. ) Includes a gray voltage generator 800 and a signal controller 600 for controlling the gray voltage generator 800.

The display panel 300 may include a plurality of signal lines G ₁ -G _n , D ₁ -D _m , a plurality of voltage lines (not shown), and a plurality of signal lines connected to them and arranged in a substantially matrix form in an equivalent circuit. Pixel PX.

Include - (D _m D ₁₎ signal lines _{(G 1 -G n, D 1} -D m) is a data line for transmitting a plurality of scan lines (G ₁ -G _n) and a data signal to pass the scanning signal. The scan lines G ₁ -G _n extend substantially in the row direction and are substantially parallel and separated from each other. The data lines D ₁ -D _m extend substantially in the column direction and are substantially parallel to each other. Each voltage line (not shown) transfers a driving voltage Vdd or the like.

Referring to FIG. 2, one pixel PX of the organic light emitting diode display according to an exemplary embodiment of the present invention, for example, the i th scan line G _i (i = 1, 2, ..., n) and the j th data The pixel PX connected to the line D _jk (j = 1, 2, ..., m, k = 1, 2, 3, 4) includes an organic light emitting diode LD, a driving transistor Qd, and a capacitor ( Cst) and the switching transistor Qs.

The switching transistor Qs is a three-terminal element and has a control terminal, an input terminal and an output terminal. Control terminal may be connected to the scanning line (G _i), an input terminal is connected with the data lines (D _j), the output terminal thereof is connected to the control terminal of the driving transistor (Qd). The switching transistor Qs transfers a data voltage in response to a scan signal applied through the scan line G _i .

The driving transistor Qd is also a three-terminal element and has a control terminal, an input terminal, and an output terminal. The control terminal is connected to the switching transistor Qs, the input terminal is connected to the driving voltage Vdd, and the output terminal is connected to the organic light emitting element LD. The driving transistor Qd flows an output current ILD whose magnitude varies depending on the voltage applied between the control terminal and the output terminal.

The capacitor Cst is connected between the control terminal and the input terminal of the driving transistor Qd. The capacitor Cst charges the data voltage applied to the control terminal of the driving transistor Qd through the switching transistor Qs and maintains it even after the switching transistor Qs is turned off.

The organic light emitting diode LD has an anode connected to the output terminal of the driving transistor Qd and a cathode connected to the common voltage Vcom. The organic light emitting element LD displays an image by emitting light at different intensities according to the output current ILD. The organic light emitting element LD emits light of one color or white color of the primary color depending on the material. Examples of the primary colors include three primary colors of red, green, and blue, and the desired color is represented by a spatial sum of these three primary colors. White is included to improve brightness. Pixels emitting red, green, blue, and white light are referred to as red pixels PR, green pixels PG, blue pixels PB, and white pixels PW, respectively.

In this case, the four pixels PX are arranged in a 2 × 2 matrix to form a dot, and the control terminal of the switching transistor Qs of the four pixels PX is connected to one scan line Gi. The two pixels PX on the scan line Gi and the two pixels PX below are formed symmetrically with respect to the scan line Gi. In addition, an input terminal of the switching transistor Qs of each pixel PX is connected to each of the data lines Di1, Di2, Di3, and Di4, and four data lines Di1, Di2, Di3, and Di4 are 2 ×. 2 intersect the center of the arranged pixels PX. In this case, the left two pixels PX and the right two pixels PX are symmetrically formed with respect to the four data lines Di1, Di2, Di3, and Di4.

The switching transistor Qs and the driving transistor Qd are n-channel metal oxide semiconductor field effect transistors (FETs) made of amorphous silicon or polycrystalline silicon. However, at least one of these transistors Qs and Qd may be a p-channel MOSFET. In addition, the connection relationship between the transistors Qs and Qd, the capacitor Cst, and the organic light emitting diode LD may be changed.

Hereinafter, the organic light emitting diode display according to the present invention will be described in detail with reference to FIGS. 3 to 6.

3 is a plan view illustrating a plurality of pixels of an organic light emitting diode display according to an exemplary embodiment of the present invention, and FIGS. 4, 5, and 6 are taken along lines IV-IV, V-V, and VI-VI of FIG. 3. It is a cut section.

Referring to FIG. 3, four pixels PG, PR, PB, and PW connected to one scan line 121b and four data lines 171a, 171b, 171c, and 171d to form a dot are red pixels PR. And blue pixels PB face diagonally, and green pixels PG and white pixels PW face diagonally. When the green pixel PG and the white pixel PW face each other in a diagonal direction, color characteristics of the organic light emitting diode display are best.

Hereinafter, a description will be given with reference to the blue pixel PB, and a part different from the blue pixel PB is extended to other pixels PG, PR, and PW.

A plurality of gate conductors including a plurality of scan lines 121a and 121b including first and second control electrodes 124a and 124b on an insulating substrate 110 made of transparent glass or plastic. conductor is formed. For convenience of description, the reference numeral 121b of the scan line of the next pixel row of the pixel row where the scan line 121a is formed.

The scan line 121b transmits a scan signal and mainly extends in the horizontal direction. The first control electrode 124a extends above the scan line 121b, and the second control electrode 124b is separated from the scan line 121b and mainly extends in the horizontal direction and then extends upward.

The gate conductors 121a, 121b, and 124b may be formed of aluminum-based metals such as aluminum (Al) and aluminum alloys, silver-based metals such as silver (Ag) and silver alloys, copper-based metals such as copper (Cu) and copper alloys, It may be made of molybdenum-based metals such as molybdenum (Mo) and molybdenum alloys, chromium (Cr), titanium (Ti), and tantalum (Ta). However, they may have a multi-layer structure including two conductive films (not shown) having different physical properties. One of the conductive films is made of a low resistivity metal such as an aluminum-based metal, a silver-based metal, or a copper-based metal to reduce signal delay or voltage drop. On the other hand, other conductive films are made of other materials, particularly materials having excellent physical, chemical and electrical contact properties with indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metals, chromium, titanium, tantalum, and the like. Good examples of such a combination include a chromium bottom film, an aluminum (alloy) top film, and an aluminum (alloy) bottom film and a molybdenum (alloy) top film. However, the gate conductors 121a, 121b, and 124b may be made of various metals and conductors.

Side surfaces of the gate conductors 121a, 121b, and 124b are inclined with respect to the surface of the substrate 110, and the inclination angle is 30-80 °.

A gate insulating layer 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the gate conductors 121a, 121b, and 124b.

On the gate insulating layer 140, a plurality of first second island semiconductors 154a and 154b made of hydrogenated amorphous silicon (amorphous silicon is abbreviated a-Si), polycrystalline silicon, or the like are formed. It is. The first and second semiconductors 154a and 154b are positioned on the first and second control electrodes 124a and 124b, respectively.

A plurality of pairs of first ohmic contacts 163a and 165a and second ohmic contacts 163b and 165b are formed on the first and second semiconductors 154a and 154b, respectively. The ohmic contacts 163a and 163b have an island shape, and may be made of a material such as n + hydrogenated amorphous silicon in which n-type impurities such as phosphorus are heavily doped or made of silicide. The first and second ohmic contacts 163a, 165a, 163b, and 165b are paired and disposed on the first and second semiconductors 154a and 154b, respectively.

Side surfaces of the semiconductors 154a and 154b and the ohmic contacts 163a, 163b, 165a, and 165b are inclined with respect to the substrate 110 surface and have an inclination angle of 30-80 °.

On the ohmic contacts 163a, 163b, 165a, and 165b and the gate insulating layer 140, a plurality of data lines 171, a plurality of driving voltage lines 172, a plurality of first input electrodes 173a, and A plurality of data conductors including a plurality of first and second output electrodes 175a and 175b is formed.

The plurality of data lines 171 transmit data voltages and mainly extend in the vertical direction to cross the scan lines 121a. The plurality of data lines 171 are formed in parallel to each other in the vertical direction, and from the left side, the green data line 171a connected to the green pixel PG, the blue data line 171b connected to the blue pixel PB, A white data line 171c connected to the white pixel PW and a red data line 171d connected to the red pixel PR are included.

The blue data line 171b and the white data line 171c are separated from the first input electrode 173a, and the green data line 171a and the red data line 171d are connected to the first input electrode 173a. have.

The blue data line 171b and the white data line 171d include an expansion unit 174 to be connected to the first input electrode 173a, and the blue data line 171b faces left toward the blue pixel PB. The white data line 171d extends to the right toward the white pixel PW. In addition, the green data line 171a includes a bent portion 176 surrounding the extension portion 174 of the blue data line 171b. The curved portion 176 is bent to the left toward the blue pixel PB. The white data line 171d also includes a bent portion 176 that is symmetrical with the blue data line 171b.

The first input electrode 173a extends toward the first control electrode 124a.

The driving voltage line 172 transfers the driving voltage Vdd and mainly extends in the vertical direction to cross the scan lines 121a and 121b. Each driving voltage line 172 includes a second input electrode 173b extending toward the second control electrode 124b. The driving voltage line 172 overlaps the second control electrode 124b and may be connected to each other.

The first and second output electrodes 175a and 175b are separated from each other and separated from the data line 171 and the driving voltage line 172.

The first input electrode 173a and the first output electrode 175a face each other with respect to the first control electrode 124a, and the second input electrode 173b and the second output electrode 175b are the second control electrode. Face each other with reference to (124b).

The data conductors 171, 172, 175a, and 175b may be made of a refractory metal such as molybdenum, chromium, tantalum, and titanium, or an alloy thereof. It may have a multilayer film structure including a resistive material conductive film (not shown). Examples of the multilayer film structure include a double film of chromium or molybdenum (alloy) lower film and an aluminum (alloy) upper film, a triple layer of molybdenum (alloy) lower film, aluminum (alloy) interlayer and molybdenum (alloy) upper film. However, the data conductors 171, 172, 175a, and 175b may be made of various other metals or conductors.

Similar to the gate conductors 121a, 121b, and 124b, the data conductors 171, 172, 175a, and 175b also incline at sides of the substrate 110 at an angle of about 30 to 80 °.

The ohmic contacts 163a, 163b, 165a, and 165b exist only between the semiconductors 154a and 154b below and the data conductors 171, 172, 175a, and 175b thereon, and lower the contact resistance therebetween. . The semiconductors 154a and 154b positioned on the scan lines 121a and 121b prevent the data conductors 171, 172, 175a and 175b from being disconnected by smoothing the surface profile. The semiconductors 154a and 154b have exposed portions, not covered by the input electrodes 173a and 173b and the output electrodes 175a and 175b.

A passivation layer 180p is formed on the data conductors 171, 172, 175a and 175b, the exposed semiconductors 154a and 154b, and the gate insulating layer 140. The passivation layer 180p is made of an inorganic insulator such as silicon nitride or silicon oxide, an organic insulator, or a low dielectric insulator. The dielectric constant of the organic insulator and the low dielectric constant insulator is preferably 4.0 or less, and is preferably a-Si: C: O, a-Si: O: F formed by plasma enhanced chemical vapor deposition (PECVD). Yes. The passivation layer 180p may be formed by having photosensitivity among the organic insulators, and the surface of the passivation layer 180p may be flat. However, the passivation layer 180p may have a double layer structure of the lower inorganic layer and the upper organic layer so as not to damage the exposed portions of the semiconductors 154a and 154b while maintaining excellent insulating properties of the organic layer.

The passivation layer 180p includes a contact hole 186 exposing the extension 174 of the blue data line 171b, an end portion 179 of the data line 171, a first input electrode, and a first output electrode. And a plurality of contact holes 182, 187, 185a, and 185b exposing the second output electrodes 173a, 175a, and 175b, respectively, and the second control electrode 124b is formed in the passivation layer 180p and the gate insulating layer 140. ) And contact holes 184 and 181 exposing the scan line end portions 129, respectively.

A plurality of color filters 230 are formed on the passivation layer 180p. The color filter 230 extends vertically in a band shape along the column of the pixel electrode 191, and two neighboring color filters 230 overlap the data line 171 and the driving voltage line 172. . The color filters 230 overlapping each other are formed of an organic layer to insulate the pixel electrode 191 from the data line 171. In addition, the light blocking member may prevent light leakage between the pixel electrodes 191. In this case, the light blocking member 220 on the common electrode display panel may be omitted, thereby simplifying the process.

The color filter 230 has a through hole through which the contact holes 184, 185a, 185b, 186, and 187 pass, and the through hole is larger than the contact holes 184, 185a, 185b, 186, and 187. The color filter 230 does not exist in the peripheral area where the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 are located.

Each color filter 230 may display one of primary colors such as three primary colors of red, green, and blue. That is, the red pixel PR of FIG. 3 is provided with a color filter 230 for displaying red, the green pixel PG is provided with a color filter 230G for displaying green, and the blue pixel PB is blue. There is provided a color filter 230B. On the other hand, the color pixel is not provided in the white pixel PW.

An overcoat 180q is formed on the color filter 230. The overcoat 180q may be made of an organic insulator, and may prevent the color filter 230 from being exposed and provide a flat surface. The overcoat 180q may be omitted.

A plurality of pixel electrodes 191, a plurality of connecting members 195 and 196, and a plurality of contact assistants 81 and 82 are formed on the overcoat 180q. . They may be made of transparent materials such as ITO or IZO or reflective metals of aluminum, silver or alloys thereof.

The pixel electrode 191 is physically and electrically connected to the second output electrode 175b through the contact hole 185b. The connecting member 195 is connected to the first output electrode 175a and the second control electrode 124b through the contact holes 184 and 185a, and the connecting member 196 is connected to the contact holes 186 and 187. The expansion unit 174 of the blue data line 171b and the first input electrode 173a are connected to each other. In this case, the extension part 174 having a wider width than the other part of the blue data line 171b and the first input electrode 173a may be connected to prevent disconnection of the blue data line 171b due to the connection. The contact auxiliary members 81 and 82 are connected to the end portion 129 of the scan line 121 and the end portion 179 of the data line 171 through the contact holes 181 and 182, respectively. The contact assistants 81 and 82 compensate for and protect the adhesion between the end portions 179 and 129 of the data line 171 and the scan line 121 and the external device.

A partition 361 is also formed on the passivation layer 180. The partition 361 surrounds the edge of the pixel electrode 191 like a bank to define an opening 365 and is made of an organic insulator or an inorganic insulator. The partition 361 may also be made of a photosensitizer including a black pigment, in which case the partition 361 serves as a light blocking member and the forming process is simple.

An organic light emitting member 370 is formed in the opening 365 on the pixel electrode 191 defined by the partition 361 and all or part of the partition 361. The organic light emitting member 370 emits white light. The organic light emitting member 370 includes a plurality of layers made of organic materials that uniquely emit light of different colors. Each layer may be made of an organic material that uniquely emits light of any one of primary colors such as three primary colors of red, green, and blue.

The organic light emitting member 370 may be formed only in the opening 365 on the pixel electrode 191 defined by the partition 361.

The organic light emitting member 370 combines three lights to give white light. Accordingly, the red pixel PR including the red color filter 230 expresses red, and the green pixel PG including the green color filter 230G displays green and the blue color filter 230B. The blue pixel PB including the blue color is displayed, and the white pixel W without the color filter 230 is white. As a result, the organic light emitting diode display displays a desired image by using a spatial sum of the primary color light emitted by the color filter 230 and the organic light emitting members 370.

However, the present invention is not limited thereto, and the organic light emitting member 370 may be formed of two layers emitting light of orange and blue sky colors, respectively, and may include one layer made of a white light emitting material. It may include. In addition, each layer of the organic light emitting member 370 may be horizontally stacked.

The organic light emitting member 370 may have a multilayer structure including an auxiliary layer (not shown) for improving the light emitting efficiency of the light emitting layer in addition to the light emitting layer (not shown) for emitting light. The auxiliary layer includes an electron transport layer (not shown) and a hole transport layer (not shown) for balancing electrons and holes, and an electron injection layer for enhancing the injection of electrons and holes ( electron injecting layer (not shown) and hole injecting layer (not shown).

The common electrode 270 to which the common voltage Vcom is applied is formed on the partition 361 and the organic light emitting member 370. The common electrode 270 is made of a reflective metal including calcium (Ca), barium (Ba), magnesium (Mg), aluminum, silver, or the like, or a transparent conductive material such as ITO or IZO.

As described above, the color filter 230 or the overcoat 180q is formed on the passivation layer 180p to sufficiently alleviate the step due to the structure under the passivation layer 180p, thereby shorting the pixel electrode 191 and the common electrode 270. To prevent.

 The pixel electrode 191 becomes an anode, the common electrode 270 becomes a cathode, or conversely, the pixel electrode 191 becomes a cathode and the common electrode 270 becomes an anode. The second control electrode 124b, the driving voltage line 172, and the second output electrode 175b overlapping each other form a storage capacitor Cst.

The organic light emitting diode display emits light toward the top or the bottom of the substrate 110 to display an image. The opaque pixel electrode 191 and the transparent common electrode 270 are applied to a top emission type organic light emitting display device that displays an image in an upward direction of the substrate 110. The opaque common electrode 270 is applied to a bottom emission organic light emitting display device that displays an image in a downward direction of the substrate 110.

On the other hand, when the semiconductors 154a and 154b are polycrystalline silicon, an intrinsic region (not shown) facing the control electrodes 124a and 124b and an impurity region (extrinsic region) located at both sides thereof are not shown. Not included). The impurity region is electrically connected to the input electrodes 173a and 173b and the output electrodes 175a and 175b, and the ohmic contacts 163a, 163b, 165a and 165b may be omitted.

In addition, the control electrodes 124a and 124b may be disposed on the semiconductors 154a and 154b, and the gate insulating layer 140 may be positioned between the semiconductors 154a and 154b and the control electrodes 124a and 124b. In this case, the data conductors 171, 172, 175a, and 175b may be disposed on the gate insulating layer 140 and may be electrically connected to the semiconductors 154a and 154b through contact holes (not shown) bored in the gate insulating layer 140. have. Alternatively, the data conductors 171, 172, 175a, and 175b may be positioned under the semiconductors 154a and 154b to be in electrical contact with the semiconductors 154a and 154b thereon.

Referring back to FIG. 1, the scan driver 400 is connected to the scan lines G ₁ -G _n of the display panel 300 to turn off the high voltage Von that can turn on the switching transistor Qs. Scan signals composed of a combination of the low voltages Voff are applied to the scan lines G ₁ -G _n , respectively.

The data driver 500 is connected to the data lines D ₁ -D _m of the display panel 300 to apply a data voltage representing the image signal DAT to the data lines D ₁ -D _m .

The gray voltage generator 800 generates a gray voltage and outputs the gray voltage to the data driver 500.

The signal controller 600 controls operations of the scan driver 400, the data driver 500, the gray voltage generator 800, and the like.

The operation of the signal controller 600 will be described schematically.

The signal controller 600 receives three color input image signals R, G, and B and an input control signal for controlling the display thereof from an external graphic controller (not shown). The input image signals R, G, and B contain luminance information of each pixel PX based on three colors, and luminance is determined by a predetermined number, for example, 1024 (= 2 ¹⁰ ), 256 (= 2 ^8). ) Or 64 (= 2 ⁶ ) grays. Examples of the input control signal include a vertical sync signal Vsync, a horizontal sync signal Hsync, a main clock MCLK, and a data enable signal DE.

The signal controller 600 extracts a white image signal from the three color input image signals R, G, and B, corrects the input image signals R, G, and B, and then performs an operation condition of the display panel 300. Proper processing to produce four color, for example, red, green, blue and white output image signals (DAT) and align them accordingly. The signal controller 600 may include a frame memory (not shown) or a lookup table (not shown) for generating the output image signal DAT.

In this case, the alignment of the output image signal DAT may vary depending on a method of defining four pixels PX forming a dot.

When the four pixels PX connected to one scan line 121b are viewed as one dot as shown in the first dot of FIG. 3, they are connected to four data lines 171a, 171b, 171c, and 171d. The output image signal DAT is arranged in the order of green, blue, white, and red in the order of the pixels PX. On the other hand, when the four spatially adjacent pixels PX such as the second dot dot2 are viewed as one dot, the time for which the data voltage is supplied to the upper and lower pixels PX is different, and thus the output image signal DAT. The alignment also changes. That is, when the output image signals DAT are arranged in the order of green, blue, white, and red, the blue and white output image signals DAT correspond to the pixels PX of the dots of the previous row. Since the second dot dot2 has no scan line Gi intersecting between the pixels PX, color combinations of the four pixels PX are well performed, and thus it is easy to display a specific color of each dot.

The signal controller 600 also generates the scan control signal CONT1 and the data control signal CONT2, and then sends the scan control signal CONT1 to the scan driver 400 and processes the scan control signal CONT2 and the data control signal CONT2. The output image signal DAT is sent to the data driver 500.

The scan control signal CONT1 includes a scan start signal STV indicating a scan start and at least one clock signal for controlling an output period of the high voltage Von. The scan control signal CONT1 may further include an output enable signal OE that defines the duration of the high voltage Von.

The data control signal CONT2 supplies analog data voltages to the horizontal synchronization start signal STH and the data lines D ₁ -D _m indicating the start of the transmission of the digital output image signal DAT for one row of pixels PX. It includes a load signal LOAD and a data clock signal HCLK to be applied.

Each of the driving devices 400, 500, 600, and 800 may be mounted directly on the display panel 300 in the form of at least one integrated circuit chip, or mounted on a flexible printed circuit film (not shown). And may be attached to the display panel 300 in the form of a tape carrier package (TCP) or mounted on a separate printed circuit board (not shown). Alternatively, these driving devices 400, 500, 600, and 800 may be integrated in the display panel 300 along with the signal lines G ₁ -G _n , D ₁ -D _m and the thin film transistor switching elements Qs and Qd. It may be. In addition, the driving devices 400, 500, 600, and 800 may be integrated into a single chip, in which case at least one of them or at least one circuit element constituting them may be outside the single chip.

Hereinafter, operations of the organic light emitting diode display illustrated in FIGS. 1 to 6 will be described in detail with reference to FIGS. 7A and 7B.

The signal controller 600 outputs red, green, blue, and white output image signals DAT, scan control signals CONT1, and data control signals CONT2.

FIG. 7A is a signal waveform diagram when the four pixels PX constituting the first dot dot1 are viewed as one dot, and the data driver 500 outputs four output image signals DAT corresponding to each dot. Receive.

The data driver 500 converts the digital output image signal DAT into analog data voltages Vdat1, Vdat2, Vdat3, and Vdat4 by selecting grayscale voltages corresponding to the green, blue, white, and red output image signals DAT. To the four data lines Dj1, Dj2, Dj3, and Dj4, respectively.

The scan driver 400 converts the scan signals Vg ₁ -Vg _n applied to the scan lines G ₁ -G _n into high voltages Von according to the scan control signal CONT1 supplied from the signal controller 600. do.

When the high voltage Von is applied to the i-th scan line Gi, the two rows of pixels PX forming the i-th dot, that is, the blue pixel PB and the white pixel PW at the top and the green pixel at the bottom PG and the switching transistor Qs of the red pixel PR are turned on. Then, the driving transistor Qd of each pixel PX receives the corresponding data voltages VGi, VBi, VWi, and VRi through the turned-on switching transistor Qs. Each driving transistor Qd outputs a driving current I _LD corresponding to the applied data voltages VGi, VBi, VWi, and VRi to the organic light emitting element LD. Accordingly, the organic light emitting element LD emits light having a size corresponding to the driving current I _LD .

As described above, the color of the first dot dot1 arranged in two rows is displayed by emitting two rows of pixels PX during one horizontal period 1H, and further including white pixels W may maintain overall high luminance. have. In addition, since the four pixels PX forming each dot are simultaneously turned on by one scan signal Vgi, the arrangement of the output image signal DAT is not a problem.

This operation proceeds to the pixel PX of the n-th row in order to display one image.

However, when the four pixels PX constituting the second dot dot2 are viewed as one dot, the signal controller 600 outputs the blue and white output image signals DAT to green and red outputs applied to the next horizontal period. It is arranged to apply together with the video signal DAT.

Therefore, as shown in FIG. 7B, when the high voltage Von is applied to the i-th scan line Gi-1, corresponding data is applied to the green pixel PG and the red pixel PR of the dot of the i-1th row. When the voltages VG _i-1 and VR _i-1 are applied and a high voltage Von is applied to the i-th scan line Gi, the blue pixel PB and the white pixel PW of the dot in the i-1th row are applied. ), The corresponding data voltages VB _i-1 , VW _i-1 are applied.

In the organic light emitting diode display, four pixels PX forming one dot are arranged in a checkerboard, and the pixel PX increases twice as much as the case in which the rows of the pixels PX are arranged in a sprite, but one scan signal Vg _i . As a result, since the four pixels PX are turned on at the same time, the holding time of the high voltage Von of the scan signal Vg _i is not shortened. Therefore, each pixel PX may have a sufficient charging time of the data voltage Vdat. One pixel is divided into a plurality of small frames, one small frame displays an image, and the other small frame displays black. Various impulsive driving is possible.

As described above, according to the present invention, a portion of the data line connected to the checkered pixels may be extended to form a thin data line, and the data line may be prevented from being disconnected. Can be.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (14)

A first pixel displaying a first color, A second pixel displaying a second color, A scan line connected to the first pixel and the second pixel and transferring a scan signal; A first data line including an extension part connected to the first pixel and transferring a first data voltage for the first pixel, and A second data line formed in parallel with the first data line and including a bent part surrounding the expansion part and connected to the second pixel to transfer a second data voltage for the second pixel; Display device comprising a. In claim 1, The scan line crosses between the first pixel and the second pixel and is connected to the first pixel and the second pixel. In claim 2, The first pixel and the second pixel face each other based on the scan line. In claim 3, A third pixel connected to the scan line and symmetrically formed with the first pixel based on the first and second data lines and displaying a third color; A fourth pixel connected to the scan line, the fourth pixel being symmetrically formed with respect to the second pixel with respect to the first and second data lines, and displaying a fourth color; A third data line including an extension part connected to the third pixel and transferring a third data voltage for the third pixel; and And a curved portion surrounding the expansion portion of the third data line, the fourth data line being connected to the fourth pixel to transfer the fourth data voltage for the fourth pixel. In claim 4, Each of the pixels, A source electrode connected to the data line and a drain electrode facing the source electrode; An organic film formed on the source electrode and the drain electrode and having a contact hole for exposing the drain electrode, A pixel electrode formed on the organic layer and connected to the drain electrode through the contact hole; A light emitting member formed on the pixel electrode, and Common electrode formed on the light emitting member Containing Display device. In claim 5, The drain electrodes of the first and third pixels are connected to the first data line and the third drain electrode, respectively, through a connection part. In any one of claims 4 to 6, The extension part of the first data line and the bent part of the second data line extend toward the first pixel, and the extension part of the third data line and the bend part of the fourth data line extend toward the third pixel. Display device. In claim 7, And the pixel electrode of the first pixel is chamfered along the bent portion of the second data line, and the pixel electrode of the third pixel is chamfered along the bent portion of the fourth data line. In claim 8, The light emitting member of the first to fourth pixels emits white light. In claim 9, The organic layer of the first to third pixels includes a color filter representing one of the first to third colors. In claim 10, The color filter may display one of red, green, and blue colors. In claim 4, The first to fourth pixels form one dot. In claim 4, And a first dot connected to the current scan line, the second pixel, and the fourth pixel connected to the previous scan line. In claim 13, When a scan signal is supplied to the current scan line, the first data voltage and the third data voltage are supplied to the first pixel and the third pixel of a previous dot, respectively, and the second pixel and the first pixel of the current dot are supplied. And a second data voltage and a fourth data voltage respectively supplied to four pixels.

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