KR20160027533A - Organic lighting emitting display device for preventing light leakage - Google Patents

Abstract

The present invention relates to an organic lighting emitting display device for preventing a light leakage phenomenon. According to one aspect of the present invention, disclosed is an organic lighting emitting display device comprising: a plurality of thin film transistors in which a plurality of data lines and a plurality of gate lines are located, and the data lines and the gate lines are intersected; a pixel area including two or more sub-pixel area and including a plurality of pixel electrodes connected to a source electrode or a drain electrode of the thin film transistor; a red sub-pixel area in which a red filter of the pixel area is located; a white sub-pixel area which is adjacent to the red sub-pixel area at a first boundary line, and in which a color filter is not located; a blue sub-pixel area which is adjacent to the white sub-pixel area at a second boundary line, and in which a blue filter is located; a green sub-pixel area in which a green filter is located in an area except for the red sub-pixel area, the white sub-pixel area, and the blue sub-pixel area in the pixel area; a display panel in which a boundary filter of the same material as the blue filter is located at the first boundary line and in which a boundary filter of the same material as the red filter is located at the second boundary line; a data driving unit for driving the plurality of data lines; and a gate driving unit for driving the plurality of gate lines.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting display device that prevents light leakage phenomenon.

2. Description of the Related Art [0002] As an information-oriented society develops, there have been various demands for a display device for displaying images. Recently, a liquid crystal display (LCD), a plasma display panel (PDP) Various display devices such as an organic light emitting display (OLED) device are being used. Such various display apparatuses include display panels corresponding thereto.

The display panel included in such a display device may be one of a plurality of display panels formed on one substrate. That is, according to various process procedures, elements, signal lines, power supply lines, or the like that constitute pixels in one substrate are formed for each display panel unit, and then a substrate is scribed in units of display panels using a scribe equipment You can cut several display panels.

On the other hand, a plurality of pixels are located on the display panel, and these pixels can be further divided into red, green, blue, and white sub-pixels. The sub-pixels may use a color filter to limit the wavelength of a specific light or to shift the wavelength band of light for each sub-pixel in order to implement color. When a color filter is used, a color filter may not be used depending on the characteristics of light emitted from the organic light emitting layer. In this case, a light leakage phenomenon may occur in which light of peripheral sub-pixels leaks in an area without a color filter. Therefore, there is a need for a technique for blocking light emitted from surrounding sub-pixels.

In view of the above, it is an object of the present invention to provide a display device in which light in a peripheral sub-pixel region does not leak to a sub-pixel region in which a color filter is not formed. Another object of the present invention is to provide a display device in which a boundary filter is located between sub-pixel regions to prevent light leakage.

In order to achieve the above object, in one aspect, the present invention provides a liquid crystal display comprising a plurality of data lines and a plurality of gate lines, a plurality of thin film transistors crossing the data lines and the gate lines, Pixel region, and a red sub-pixel region in which a red color filter is located among the pixel regions, and a red sub-pixel region in which the red sub- A blue sub-pixel region adjacent to the white sub-pixel region and adjacent to the white sub-pixel region and having a blue color filter, and a red sub-pixel region adjacent to the red sub- A green subpixel region in which a green color filter is located in a region excluding the white subpixel region and the blue subpixel region, A display panel in which a boundary filter of the same material as the blue color filter is located on the first boundary line and a boundary filter of the same material as that of the red color filter is located on the second boundary line, And a gate driver for driving the plurality of gate lines.

In another aspect, the present invention provides a liquid crystal display device including a plurality of thin film transistors having a plurality of data lines and a plurality of gate lines, the data lines and the gate lines crossing each other, and a plurality of pixels A first subpixel region including a plurality of subpixel regions and including two or more subpixel regions, and a first subpixel region in which a color filter is located in the pixel region; and a boundary filter disposed at a boundary adjacent to the first subpixel region, A plurality of data lines, and a gate driver for driving the plurality of gate lines. The display panel includes a first sub-pixel region and a second sub-pixel region.

As described above, according to the present invention, it is possible to provide a display device in which light in the peripheral sub-pixel region does not leak to the sub-pixel region in which no color filter is formed.

1 is a view schematically showing a display device according to embodiments.
2A is a plan view showing a case where no color filter is formed in a white sub-pixel region.
FIG. 2B is a cross-sectional view showing a state in which no color filter is formed in the white sub-pixel region. FIG.
FIG. 3 is a view showing light gaps occurring in the section of FIG. 2b. FIG.
4A is a plan view showing a boundary filter formed on a boundary line of a white pixel region in order to block light leakage in a white sub-pixel region according to an embodiment of the present invention.
4B is a cross-sectional view in which a boundary filter is additionally formed on a boundary line of a white pixel region in order to block light leakage in a white sub-pixel region according to an embodiment of the present invention.
4C is a diagram illustrating a process of blocking light of neighboring sub-pixels in a boundary filter according to an embodiment of the present invention.
5A through 5C are views illustrating a process of blocking light in the boundary filter 461 according to an embodiment of the present invention.
6 is a diagram showing an arrangement of sub-pixels of an RWBG to which the present invention can be applied.
7 is a view showing a pixel region in which a boundary filter for preventing light leakage is formed between a sub-pixel region in which a color filter is not formed and a sub-pixel region in which a color filter is formed, according to another embodiment of the present invention.
FIG. 8 is a diagram illustrating a wavelength band between a color filter and a boundary filter according to an exemplary embodiment of the present invention. Referring to FIG.
9 is a graph showing characteristics of a boundary filter transmitting light in a wavelength band and a wavelength band of a color filter of a first sub-pixel region according to an exemplary embodiment of the present invention.
FIGS. 10A to 10D are views showing a process of forming a color filter in a pixel region having a structure like 610 of FIG.
11 shows a pixel region in which a boundary filter for preventing light leakage is formed when green and blue sub-pixel regions are implemented around a white sub-pixel region.
12 shows a pixel region in which a boundary filter for preventing light leakage is formed when the green and red sub-pixel regions are implemented around the white sub-pixel region.
Fig. 13 shows an embodiment in which a boundary filter is formed doubly in the embodiment of Fig.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

1 is a view schematically showing a display device according to embodiments.

Referring to FIG. 1, a display device 100 according to an embodiment includes a plurality of first lines VL1 to VLm formed in a first direction (e.g., a vertical direction) A display panel 110 on which a plurality of second lines HL1 to HLn are formed, a first driver 120 for supplying a first signal to a plurality of first lines VL1 to VLm, A second driver 130 for supplying a second signal to the first and second lines HL1 to HLn and a timing controller 140 for controlling the first and second drivers 120 and 130.

The display panel 110 is provided with a plurality of first lines VL1 to VLm formed in a first direction (e.g., a vertical direction) and a plurality of second lines HL1 to HLn formed in a second direction (e.g., A plurality of pixels (P) are defined according to the intersection of the pixels.

Each of the first driving unit 120 and the second driving unit 130 may include at least one driver IC for outputting a signal for displaying an image.

A plurality of first lines VL1 to VLm formed in the first direction on the display panel 110 are formed in a vertical direction (first direction) to transmit a data voltage (first signal) And the first driver 120 may be a data driver for supplying the data voltage to the data line.

A plurality of second lines HL1 to HLn formed in the second direction on the display panel 110 are formed in a horizontal direction (second direction) to form a gate signal (first signal) And the second driver 130 may be a gate driver for supplying a scan signal to the gate line.

In addition, a pad portion is formed on the display panel 110 to connect the first driver 120 and the second driver 130. When the first driver 120 supplies a first signal to the plurality of first lines VL1 through VLm, the pad unit transmits the first signal to the display panel 110 and the second driver 130 similarly applies a plurality of second lines HL1 to HLn), and transmits the second signal to the display panel (110). Therefore, the pad portion can be formed together in the step of forming the regions of the pixels of the display panel 110. [

1 is summarized as follows. A plurality of data lines and a plurality of gate lines, a plurality of thin film transistors each having a data line and a gate line crossing each other, and a plurality of pixel electrodes connected to a source electrode or a drain electrode of the thin film transistor, A data driver for driving the plurality of data lines, and a gate driver for driving the plurality of gate lines constitute an OLED display.

2A is a plan view showing a case where no color filter is formed in a white sub-pixel region. Four color sub-pixels are formed, and a red color filter 251, a blue color filter 253, and a green color filter 254 are located in the respective sub-pixel regions. A color filter of a specific color passes only the wavelength of light corresponding to that color. And the color filter is not formed in the white sub-pixel region 252. Data lines 212a, 212b, 212c, and 212d, a Vref 214 line for transmitting a reference voltage, and the like are formed between the sub-pixel regions. The data lines 212a, 212b, 212c and 212d are connected to a switching transistor and the Vref 214 line is connected to a driving transistor, May be connected to a sensing transistor. However, since the present invention is not limited to a specific transistor structure, various transistor structures can be applied.

A display device using white organic EL material as a light source is formed by stacking color filters 251, 253 and 254 on a region where EL (electroluminescence) , G, B). In the area where the current color filter is laminated, one color layer is stacked only on the area where the EL emits light, and the light passing through the color filter blocks the remaining wavelength band excluding the wavelength band of the color filter, Color. (Red), B (blue), G (green), and W (white) in the process of describing red / blue / green / white.

FIG. 2B is a cross-sectional view showing a state in which no color filter is formed in the white sub-pixel region. FIG.

A buffer layer 204, a gate insulator 215, a gate 220, an interlayer dielectric (ILD) 225, a passivation layer 235, an overcoat layer (Overcoat) 240, and a bank 245 are formed. A pixel electrode (or an anode electrode) 280 and an organic layer 285 are formed on the red color filter 251, the white sub-pixel region 252, the blue color filter 253, and the green color filter 254 And a cathode electrode 290 is disposed on the organic layer 285.

An activation layer (not shown) is disposed on the buffer layer 204. A gate insulating layer 215 and a gate 220 are located on the activation layer and an interlayer insulation layer 225 is formed on the activation layer. A part of the interlayer insulating layer 225 is etched to expose the activation layer, and the exposed activation layer and the source / drain (not shown in the figure) electrodes are connected.

The light leaked from the surrounding red color filter 251 and the light leaking from the blue color filter 253 are not incident on the white sub pixel area 252 because the color filter is not formed in the white sub pixel area 252 of FIG. And blue or red, which is not white, leaks out, resulting in a mixed color and white color is not properly expressed.

FIG. 3 is a view showing light gaps occurring in the section of FIG. 2b. FIG.

Color filters 251, 253, and 254 are positioned in the R, G, and B sub-pixels of the sub-pixel in the pixel, while a color filter 252 is provided in the white sub- There is a problem that light is leaked to the white sub-pixel when the adjacent sub-pixels emit light (310, 320). In the white sub-pixel, there is no color filter and a step is formed in a portion covered with the overcoat layer 240. Such a step can change the path of light and increase the light leakage compared with other sub-pixels. In this case, color and quality deterioration of the display device occurs.

On the other hand, light is directed from the sub-pixel other than white, for example, from the green sub-pixel to the adjacent sub-pixel, but the light leakage is not generated because the color filter 253 of the adjacent sub-

Therefore, in order to prevent light of a specific wavelength band of a neighboring sub-pixel in the white sub-pixel region, that is, light of a specific color, in an embodiment of the present invention, a boundary filter for blocking the wavelength of the corresponding color may be used. For example, when the wavelength of blue light leaks, a red color filter can be used as a boundary filter to block the wavelength of 400 to 460 nm, which is the wavelength of blue light. When a boundary filter is used as a red color filter, light of a wavelength band of 551 nm to 660 nm is transmitted, so that light of a wavelength of 400 nm to 460 nm leaking from a blue color filter can not pass through a boundary filter formed of a red color filter. Light leakage phenomenon can be prevented.

In another embodiment of the present invention, when a wavelength of red light leaks, a blue color filter may be used as a boundary filter to block light of 551 nm to 660 nm which is a wavelength of red light. When a boundary filter is used as a blue color filter, light of a wavelength band of 400 nm to 460 nm is transmitted, so that light of a wavelength of 551 nm to 660 nm leaking from a red color filter can not pass through a boundary filter formed of a blue color filter, Light leakage phenomenon can be prevented.

The ranges of the blue and red wavelengths described above may be varied in selecting an organic light emitting layer and a color filter suitable for the organic light emitting layer. The blue color filter may have a thickness of 450 nm to 500 nm, the green color filter may have a thickness of 490 nm to 560 nm, and the red color filter may have a thickness of 550 nm to 650 nm. This case will be described later with reference to FIG. 11 and FIG.

4A is a plan view showing a boundary filter formed on a boundary line of a white pixel region in order to block light leakage in a white sub-pixel region according to an embodiment of the present invention.

The red sub-pixel region in which the red color filter 451 is formed and the 472a region in which the white sub-pixel region 452 is adjacent to and adjacent to the white sub-pixel region 451 are areas where light leaks from the red color filter 451. A boundary filter is formed at this boundary line as shown at 463. Similarly, the region of 472b where the blue sub-pixel region in which the blue color filter 453 is formed and the white sub-pixel region 452 are adjacent to each other is a region where light leaks from the blue color filter 453. A boundary filter is formed on this boundary line as shown by reference numeral 461.

4B is a cross-sectional view in which a boundary filter is additionally formed on a boundary line of a white pixel region in order to block light leakage in a white sub-pixel region according to an embodiment of the present invention. Sectional view taken along line II-II 'of FIG. 4A.

There is a red subpixel region where the red color filter 451 is located in the pixel region, and a white subpixel region 452 adjacent to the red subpixel region by the first boundary and in which the color filter is not present. The blue sub-pixel region in which the blue color filter 453 is located is adjacent to the white sub-pixel region at the second boundary line. Of course, the first boundary line (472a in FIG. 4A) and the second boundary line (472B in FIG. 4A) are symmetrical with respect to the white subpixel region 452 as previously described with reference to FIG. 4A.

And a green subpixel region adjacent to the blue subpixel region and having a green color filter 454 exist.

A boundary filter 463 of the same material as that of the blue color filter is formed on the first boundary line in order to block the light of the red wavelength in the red sub-pixel region in order to block light leaking from the red sub-pixel region.

A boundary filter 461 of the same material as that of the red color filter is formed on the second boundary line in order to block light of the blue wavelength in the blue sub-pixel region in order to prevent light leaking from the blue sub-pixel region.

FIG. 4B is summarized as follows.

If a sub-pixel region in which a color filter is located is referred to as a first sub-pixel region, a sub-pixel region adjacent to the first sub-pixel region and a color filter is called a second sub-pixel region, The second sub-pixel region corresponds to the white sub-pixel region 452 of FIG. 4B. And the first sub-pixel region corresponds to the red / blue sub-pixel region 451 or 453 of FIG. 4B.

A color filter is formed at a boundary between the first sub-pixel region and the second sub-pixel region, and when the color filter of the first sub-pixel region is a red color filter, the boundary filter is formed of the same material as the blue color filter, Can be blocked.

A color filter is formed at a boundary between the first sub-pixel region and the second sub-pixel region, and when the color filter of the first sub-pixel region is a blue color filter, the boundary filter is formed of the same material as the red color filter, Can be blocked.

4C is a diagram illustrating a process of blocking light of neighboring sub-pixels in a boundary filter according to an embodiment of the present invention. The light 491 generated in the red sub-pixel region in FIG. 4C is blocked by the boundary filter 463 and does not leak into the white sub-pixel region 452. Likewise, the light 492 generated in the blue sub-pixel region is blocked by the boundary filter 461 and does not leak into the white sub-pixel region 452. Also, since the light 493 generated in the green sub-pixel region is also blocked by the blue color filter 453 in the adjacent blue sub-pixel region, the structure of FIG. 4C prevents light coming from the adjacent sub- The color rendering quality is improved.

The WOLED (White OLED) display uses a WOLED as an organic layer (EL), uses a color filter for RGB color implementation, and the color filter removes colors of other wavelength bands except a specific color wavelength to realize a specific color .

4A to 4C, an embodiment of the present invention is an invention applying a principle of blocking light when a dual or triple color filter having wavelength bands which do not overlap with each other is laminated, The color filters of adjacent sub-pixel regions of pixels are layered in multiple layers to block light and improve image quality.

Examples of the color filters of the wavelength band that do not overlap with each other include color filters of a wavelength band of 350 nm to 500 nm and color filters of a wavelength band of 550 nm to 700 nm such that the wavelength bands do not overlap.

5A through 5C are views illustrating a process of blocking light in the boundary filter 461 according to an embodiment of the present invention.

5A shows light generated in a white OLED. The white OLED emits white including both blue, green, and red, and the wavelengths of these blue, green, and red are as shown in FIG. 5A. The blue color includes a band of 400 to 460 nm. The blue color filter transmits blue light with a wavelength band of 400 to 460 nm to enhance the blue color. Green covers the band from 461 to 550 nm. To increase the green color, the green color filter transmits green light only through the 461 to 550 nm wavelength band. The red color includes a band of 551 to 650 nm. To increase the red color, the red color filter transmits red light only through the 551 ~ 650nm wavelength band.

As shown in FIG. 5A, if a blue color filter is applied to light of a white OLED including light of all wavelengths, light of a band other than 400 to 460 nm is removed as shown in FIG. 5B. On the other hand, the light may leak into the white sub-pixel region, but the boundary filter according to an embodiment of the present invention may be formed of the same material as the red color filter. When a red color filter is applied to light of a wavelength band of 400 to 460 nm, light of a wavelength band of 400 to 460 nm is not transmitted through a red color filter as shown in FIG. 5C, and as a result, Light leakage phenomenon can be prevented.

One embodiment of the present invention has been described with reference to an embodiment for preventing light leakage in a white sub-pixel area where no color filter is formed. However, the present invention is not limited thereto and can be applied to a sub-pixel region in which a color filter is not formed.

For example, when a light emitting layer emits light of a specific wavelength band, there exists a sub-pixel region that transmits light of the corresponding wavelength band as it is and does not form a color filter. It is necessary that the corresponding subpixel region is shielded from light leaking from the color filter of another adjacent subpixel region. A color filter that passes light in a wavelength band that does not overlap with the wavelength of the corresponding light can be used as a boundary filter in order to block light through a color filter in an adjacent sub pixel area. Formation of a boundary filter in this case will be described with reference to FIGS. 7 to 9. FIG.

6 is a diagram showing an arrangement of sub-pixels of an RWBG to which the present invention can be applied. In the drawing, R denotes a red subpixel region in which a red color filter is formed, W denotes a white subpixel region in which no color filter is formed, B denotes a blue subpixel region in which a blue color filter is formed, G denotes a green subpixel region .

In FIG. 6, reference numeral 610 denotes a case where the sub-pixels of the RWBG are located in parallel as shown in FIGS. 4A to 4C. Four sub-pixels are located in one pixel 615. [ In this case, the boundary filters are 612a and 612b between the R-W sub-pixels 611a and 611b and the W-B sub-pixels in the vertical direction.

620 is a case where the sub-pixels of the RWBG form a quadrangular shape. Four sub-pixels are formed in one pixel 625. [ In this case, the boundary filters are 621a, 621b and 621c between the R-W sub-pixels in the longitudinal direction and 622a, 622b, 622c and 622d between the G-B sub-pixels in the lateral direction.

In summary, in an embodiment of the present invention, a plurality of data lines and a plurality of gate lines are disposed in a configuration of a display device for preventing light generated from red and blue color filters from leaking into a white sub- There is a pixel region including a plurality of thin film transistors crossing a line and a gate line and a plurality of pixel electrodes connected to a source electrode or a drain electrode of the thin film transistor and including two or more sub pixel regions, A red subpixel region in which a red color filter is located in a pixel region, a white subpixel region adjacent to a red subpixel region at a first boundary line and not located at a color filter, and a blue subpixel region adjacent to a white subpixel region at a second boundary, A blue sub-pixel region in which a color filter is located, and a red sub-pixel region and a white sub- And a boundary filter of the same material as that of the blue color filter is located on the first boundary line and a boundary of the same material as the red color filter is located on the second boundary line. And a display panel on which the filter is located. The display device includes a data driver for driving the plurality of data lines and a gate driver for driving the plurality of gate lines.

6, an example of the boundary filter formed on the first boundary line is 611a, 611b, 621a, 621b, and 621c between the red subpixel region and the white subpixel region, and the boundary filter formed on the first boundary line is a blue color filter A boundary filter of the same material as the red sub-pixel region is formed, and this boundary filter provides an effect of blocking light leaking from the red sub-pixel region. Examples of the boundary filters formed on the second boundary line include 612a, 612b, 622a, 622b, 622c, and 622d between the blue sub pixel region and the white sub pixel region, and the boundary filter formed on the second boundary line includes the same material as the red color filter Is formed. This boundary filter provides the effect of blocking light escaping from the blue sub-pixel region.

6, the boundary filter of the first boundary line and the boundary filter of the second boundary line are parallelly symmetric with respect to the white sub-pixel region. This prevents the light leakage from adjacent sub-pixel regions by forming boundary filters in opposition to the parallel color filters that are symmetrically parallel to the white sub-pixel. In the structure of 610, the portion where the light leakage occurs from the white sub-pixel region is the R-W and B-W boundary lines, and the respective boundary filters block the red and blue light at the boundary.

6, the boundary filter of the first boundary line and the boundary filter of the second boundary line maintain a right angle with respect to the white sub-pixel region. This prevents the light leakage from adjacent sub-pixel regions by forming a boundary filter on the four color filters based on the white sub-pixel. In the structure of 620, the portion where the light leakage occurs from the white sub-pixel region is the R-W and B-W boundary lines, and the respective boundary filters block the red and blue light at the boundary. 620, a thin film transistor is formed in the B or W subpixel region between W and B, so that it is not necessary to dispose a separate boundary filter when the light leakage is blocked by the thin film transistor region.

In FIGS. 4 to 6, embodiments in which the present invention is applied to the red, blue, green, and white sub-pixel regions have been described. However, the present invention is not limited to this, and a sub-pixel region in which a color filter is not formed may form a boundary filter to block light by a color filter in another adjacent sub-pixel region.

7 is a view showing a pixel region in which a boundary filter for preventing light leakage is formed between a sub-pixel region in which a color filter is not formed and a sub-pixel region in which a color filter is formed, according to another embodiment of the present invention.

A plurality of data lines and a plurality of gate lines, a plurality of thin film transistors each having a data line and a gate line crossing each other, and a plurality of pixel electrodes connected to a source electrode or a drain electrode of the thin film transistor, The structure of the boundary filter in two sub-pixel regions among the pixel regions including the sub-pixel region will be described. The pixel region includes two or more sub-pixel regions, and FIG. 7 illustrates two sub-pixel regions that are part of the pixel region.

Reference numeral 710 denotes a first sub-pixel region in which the color filter is located, and numeral 720 denotes a second sub-pixel region that is adjacent to the first sub-pixel region and does not include a color filter. A boundary filter 715 is formed between the first sub-pixel region 710 and the second sub-pixel region 720. The wavelength band of the light transmitted through the second sub-pixel region 720 may vary according to whether the light emitted from the second sub-pixel region 720 passes through the sub-pixel region through which the emitted light passes as it is . For example, when the emitted light is white, the second sub-pixel region 720 can transmit the full-wave length band of visible light, which is a white wavelength band.

The boundary filter functions to prevent light of the first sub-pixel region 710 from leaking into the second sub-pixel region 720. Therefore, in order to cancel the light of the color filter located in the first sub-pixel region 710, the light of the wavelength band different from the wavelength band of the light passing through the color filter of the first sub- . As a result, the boundary filter provides the effect of blocking the light passing through the color filter of the first sub-pixel region 710, and the light emitted from the color filter of the first sub-pixel region 710 is incident on the second sub- 720).

FIG. 8 is a diagram illustrating a wavelength band between a color filter and a boundary filter according to an exemplary embodiment of the present invention. Referring to FIG.

The range of the wavelength band of the light transmitted through the color filter of the first sub-pixel region 710 in Fig. 7 is max_cf nm at min_cf nm like the region 810 in Fig. In this case, the range of the wavelength band of the light transmitted by the boundary filter may be 821 area which is larger than max_cf nm or 822 area which is smaller than min_cf nm. Here, a certain distance can be maintained between the regions 810 and 821 and 822 in order to block light. That is, when a boundary filter is formed that transmits light in a wavelength band that does not overlap with min_cf to max_cf nm, which is the wavelength band of light transmitted through the color filter of the first sub-pixel region 710, As a result, light of different wavelength bands can not pass through the boundary filter, thereby blocking the light.

This will be described with reference to FIG.

9 is a graph showing characteristics of a boundary filter transmitting light in a wavelength band and a wavelength band of a color filter of a first sub-pixel region according to an exemplary embodiment of the present invention.

901 is a wavelength at which the first sub pixel region transmits blue light. When max_cf nm is less than 460 nm as in 910a, the wavelength band of the light transmitted by the boundary filter has a band of 551 nm or more, such as 921. In this case, the boundary filter may have a property of transmitting red light. The boundary filter transmits the red light, but the light of the first sub-pixel region, which is introduced into the boundary filter, is the light of the blue wavelength band, so that the boundary filter provides the effect of blocking the light.

902 is a wavelength at which the first sub-pixel region transmits red light. When the min_cf nm is larger than 551 nm as in 910b, the wavelength band of the light transmitted by the boundary filter has a band of 460 nm or less as in 922. In this case, the boundary filter can retain the property of transmitting blue light. The boundary filter transmits blue light, but the light of the first sub-pixel region, which is introduced into the boundary filter, is a light of a red wavelength band, so that the boundary filter provides an effect of blocking light.

In the present invention, since the boundary filter can be used as a color filter of another sub-pixel region, the boundary filter of the white sub-pixel region in the pattern of the photoresist forming the color filter can also be formed in one step.

FIGS. 10A to 10D are views showing a process of forming a color filter in a pixel region having a structure like 610 of FIG.

10A shows a pixel region composed of four sub-pixels as shown at 610 in FIG. Each sub-pixel region is represented by a dotted line in a red sub-pixel region 1011, a white sub-pixel region 1012, a blue sub-pixel region 1013, and a green sub-pixel region 1014.

10B is a diagram showing a boundary filter of the same material as that of the red color filter and the red color filter in the red sub-pixel region 1011. In FIG. Reference numeral 1051 denotes a red color filter formed in the red sub-pixel region 1011 and reference numeral 1061 denotes a boundary filter formed on the boundary line between the white sub-pixel region 1012 and the blue sub- The boundary filter 1061 is formed in the same process with the same material as the red color filter.

10C is a view showing a blue color sub-pixel region 1013 in which a boundary filter of the same material as the blue color filter and the blue color filter is formed. Reference numeral 1053 denotes a blue color filter formed in the blue sub pixel region 1013 and reference numeral 1063 denotes a boundary filter formed in the boundary line between the white sub pixel region 1012 and the red sub pixel region 1011. The boundary filter 1063 is formed in the same process with the same material as the blue color filter.

10D is a diagram in which a green color filter is formed in the green sub-pixel region 1014.

Through the steps of Figs. 10B to 10D, the boundary filter can be formed without adding a separate mask.

In FIG. 6, embodiments in which red and blue sub-pixel regions are adjacent to a white sub-pixel region have been described. Next, the case where the white sub-pixel region is adjacent to the green sub-pixel region will be described. 7, a white subpixel region is implemented as an embodiment of a subpixel region in which a color filter is not formed, and in an embodiment of a subpixel region adjacent thereto and formed with a color filter, green and blue Pixel region or a pixel region in which a boundary filter for preventing light leakage is formed when the green and red sub-pixel regions are implemented.

11 shows a pixel region in which a boundary filter for preventing light leakage is formed when green and blue sub-pixel regions are implemented around a white sub-pixel region.

First look at 1110.

A blue sub-pixel region is formed on one side of the white sub-pixel region, and a boundary filter 1111 for preventing light leakage is formed therebetween. At this time, the boundary filter 1111 may be formed of the same material as the red color filter that does not overlap with the wavelength of the light transmitted by the blue color filter in order to block the blue color. On the other hand, a green sub-pixel region is formed on the other side of the white sub-pixel region, and a boundary filter 1112 for preventing light leakage is formed therebetween. At this time, the boundary filter 1112 may be formed of the same material as the blue color filter that does not overlap with the wavelength of the light transmitted by the green color filter in order to block green.

1150 is discussed in another embodiment.

A blue sub-pixel region is formed on one side of the white sub-pixel region, and a boundary filter 1151 for preventing light leakage is formed therebetween. At this time, the boundary filter 1151 may be formed of the same material as the red color filter that does not overlap with the wavelength of the light transmitted through the blue color filter to block the blue color. On the other hand, a green sub-pixel region is formed on the other side of the white sub-pixel region, and a boundary filter 1152 for preventing light leakage is formed therebetween. At this time, the boundary filter 1152 may be formed of the same material as the red color filter that does not overlap with the wavelength of the light transmitted by the green color filter in order to block green.

In summary, when the color structure of the sub-pixels is blue / white / green / white, a boundary filter of a material such as a red color filter is stacked in a space between the blue sub-pixel region and the white sub- And a boundary filter of a material such as a blue or red color filter may be stacked in a space between the green sub pixel region and the white sub pixel region adjacent to the white sub pixel region. In this process, the effect of green light is blocked.

12 shows a pixel region in which a boundary filter for preventing light leakage is formed when the green and red sub-pixel regions are implemented around the white sub-pixel region.

1210 first.

A blue sub-pixel region is formed on one side of the white sub-pixel region, and a boundary filter 1211 for preventing light leakage is formed therebetween. At this time, the boundary filter 1211 may be formed of the same material as the blue color filter that does not overlap with the wavelength of the light transmitted by the red color filter in order to block the red color. On the other hand, a green sub-pixel region is formed on the other side of the white sub-pixel region, and a boundary filter 1112 for preventing light leakage is formed therebetween. At this time, the boundary filter 1112 may be formed of the same material as the red color filter which does not overlap with the wavelength of the light transmitted by the green color filter in order to block green.

In another embodiment 1250 is discussed.

A red sub-pixel region is formed on one side of the white sub-pixel region, and a boundary filter 1251 for preventing light leakage is formed therebetween. In this case, the boundary filter 1251 may be formed of the same material as the blue color filter that does not overlap with the wavelength of the light transmitted by the red color filter to block the red color. On the other hand, a green sub-pixel region is formed on the other side of the white sub-pixel region, and a boundary filter 1252 for preventing light leakage is formed therebetween. At this time, the boundary filter 1252 may be formed of the same material as the blue color filter which does not overlap with the wavelength of the light transmitted by the green color filter in order to block green.

In summary, when a color structure of subpixels is red / white / green / blue, a boundary filter of a material such as a blue color filter is stacked in a space between a red subpixel region and a white subpixel region adjacent to a white subpixel region And a boundary filter of a material such as a blue or red color filter may be stacked in a space between the green sub pixel region and the white sub pixel region adjacent to the white sub pixel region. In this process, the effect of green light is blocked.

The wavelength bands of the light transmitted by the color filters may be different because the wavelength bands of the RGB partially overlap as shown in Fig. 5A. Therefore, the range of the light transmitted by the color filter itself may overlap. For example, a blue color filter may have a thickness of 450 nm to 500 nm, a green color filter may have a thickness of 490 nm to 560 nm, and a red color filter may have a thickness of 550 nm to 650 nm. In this case, a boundary filter (a material such as a blue color filter) formed between the green sub-pixel region and the white sub-pixel region as shown by 1112 in FIG. 11 or 1252 in FIG. 12 can not completely block light, Although it can leak, this wavelength is a very narrow wavelength, so it has a large effect of blocking light. Similarly, a boundary filter (a material such as a red color filter) formed between the green sub-pixel region and the white sub-pixel region as shown by 1152 in FIG. 11 or 1212 in FIG. 12 does not completely block the light and emits light of 550 nm to 560 nm However, since this wavelength is a very narrow wavelength band, the effect of blocking light is great.

On the other hand, when the color filters are overlapped with each other, when the other color filters are stacked to form the boundary filter, the light in the adjacent sub pixel region can be completely blocked.

Fig. 13 shows an embodiment in which a boundary filter is formed doubly in the embodiment of Fig.

And a boundary filter is doubly formed between the white sub pixel region and the green sub pixel region. A boundary filter 1311 of a material such as a blue color filter and a boundary filter 1112 of a material such as a red color filter is formed in 1310 so that light of 490 nm to 500 nm is blocked by the boundary filter 1311. This is because the boundary filter 1311 transmits light in a wavelength band of 550 nm to 650 nm like a red color filter.

Similarly, at 1350, a boundary filter 1351 of a material such as a boundary filter 1152 and a blue color filter of a material such as a red color filter is formed, and light of 550 nm to 560 nm is blocked by the boundary filter 1351. This is because the boundary filter 1351 transmits light in a wavelength band of 450 nm to 500 nm like a blue color filter.

The following is summarized.

Depending on the characteristics of the light emitted from the organic light emitting layer, the wavelengths of light transmitted through the red, blue, and green color filters may be differently implemented. In one embodiment, when the wavelength bands of light transmitted by the respective color filters do not overlap, a boundary filter by one material (blue or red color filter) is formed between the green and white sub-pixel regions in order to block the light leakage . In another embodiment, when the wavelength band of light transmitted by each color filter is overlapped, two boundary filters (blue and red color filters) of two materials are formed between the green and white sub-pixel regions to block the light leakage . When a boundary filter is formed, light leaking from one boundary filter can be completely blocked by boundary filters of other wavelength bands.

However, the present invention is not limited thereto, and the present invention can be applied to all the sub-pixel regions in which a color filter is not formed, And can be applied to the embodiment. In this process, the boundary filter may be formed singly, or may be formed as double or triple.

An embodiment of the present invention can be applied to a structure of a device that implements color using a color filter in a display device using an OLED light emitting device and a light leakage phenomenon occurs in a structure having a sub- Can be applied. In addition, as shown in FIG. 6, one sub-pixel region constituting one pixel region may be included in the display panel of the display device. Also, a color filter having a wavelength band that does not overlap with a color filter of an adjacent sub pixel region is formed by a boundary filter so that a multi-color filter is stacked. The stacking of the multi-color filters is performed at the boundary of the sub-pixel region without the color filter as described above. An example of implementation of a multi-color filter having wavelength bands not overlapping with each other is as follows.

i) A color filter having a wavelength band of 400 nm to 460 nm and a color filter having a wavelength of 461 nm to 600 nm may be laminated.

ii) A color filter of 400 to 460 nm wavelength band, a color filter of 461 nm to 550 nm wavelength band, and a color filter of 551 nm to 650 nm wavelength band can be laminated.

One embodiment of the present invention prevents light leakage by blocking light in a neighboring sub-pixel region through multiple CF stacking, and improves the image quality of a display device.

An embodiment of the present invention can be applied to a WOLED display device using a white EL (White EL) as a light source, which realizes RGB colors using a color filter, and a color filter is not formed in a white area . That is, the sub-pixel of one pixel includes four sub-pixels of white / red / green / blue (W, R, G, B) In this case, since there is no color filter in the white sub-pixel, when the adjacent sub-pixel emits light, the light is transmitted to the white sub-pixel region, causing light leakage. The color and image quality are deteriorating due to such a problem.

 The present invention utilizes the principle of blocking light by stacking light generated by passing through a color filter with a color filter of a different wavelength band. The multi-color filter is laminated between the sub-pixels to transmit only the light of each sub- The light leakage phenomenon can be solved and the image quality can be improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.

100: display device 110: display panel
120: first driving part 130: second driving part
140: timing controller 200: substrate
461, 463, 611, 612, 621, 622, 715: boundary filter

Claims (9)

A plurality of data lines and a plurality of gate lines, a plurality of thin film transistors in which the data lines and the gate lines cross each other,
A pixel region including a plurality of pixel electrodes connected to a source electrode or a drain electrode of the thin film transistor and including two or more sub pixel regions,
A red sub-pixel region in which a red color filter is located in the pixel region,
A white sub-pixel region adjacent to the red sub-pixel region and adjacent to the first boundary line,
A blue sub-pixel region adjacent to the white sub-pixel region and a second boundary line and having a blue color filter,
A green subpixel region in which a green color filter is located among the red subpixel region, the white subpixel region, and the blue subpixel region excluding the blue subpixel region;
A boundary filter having the same material as that of the blue color filter is disposed on the first boundary line,
A display panel on which the boundary filter of the same material as the red color filter is located on the second boundary line;
A data driver driving the plurality of data lines; And
And a gate driver for driving the plurality of gate lines.
The method according to claim 1,
Wherein the boundary filter of the first boundary line and the boundary filter of the second boundary line are symmetric in parallel with respect to the white sub pixel region.
The method according to claim 1,
Wherein the boundary filter of the first boundary line and the boundary filter of the second boundary line maintain a right angle with respect to the white sub pixel region.
A plurality of data lines and a plurality of gate lines, a plurality of thin film transistors in which the data lines and the gate lines cross each other,
A pixel region including a plurality of pixel electrodes connected to a source electrode or a drain electrode of the thin film transistor and including two or more sub pixel regions,
A first sub-pixel region in which the color filter is located in the pixel region,
A display panel including a second sub-pixel region in which a boundary filter is located at a boundary of the pixel region adjacent to the first sub-pixel region;
A data driver driving the plurality of data lines; And
And a gate driver for driving the plurality of gate lines.
5. The method of claim 4,
The range of the wavelength band of light transmitted by the color filter of the first sub-pixel region is max_cf nm at min_cf nm,
Wherein a range of a wavelength band of light transmitted by the boundary filter is in a range larger than max_cf nm or smaller than min_cf nm.
5. The method of claim 4,
Wherein the boundary filter is the same material as the blue color filter when the color filter of the first sub-pixel region at the boundary with the second sub-pixel region is a red color filter.
5. The method of claim 4,
Wherein the boundary filter is the same material as the red color filter when the color filter of the first pixel region at the boundary with the second sub-pixel region is a blue color filter.
5. The method of claim 4,
And a color filter is not formed in a region where the pixel electrode is located in the second sub-pixel region.
5. The method of claim 4,
Wherein when the color filter of the first sub-pixel region is a green color filter, the boundary filter is doubly formed of a blue color filter and a red color filter.

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