KR102050446B1 - Diode display device including touch panel - Google Patents

Diode display device including touch panel Download PDF

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Publication number
KR102050446B1
KR102050446B1 KR1020130073437A KR20130073437A KR102050446B1 KR 102050446 B1 KR102050446 B1 KR 102050446B1 KR 1020130073437 A KR1020130073437 A KR 1020130073437A KR 20130073437 A KR20130073437 A KR 20130073437A KR 102050446 B1 KR102050446 B1 KR 102050446B1
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South Korea
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electrode
array substrate
sub
color filter
electrodes
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KR1020130073437A
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Korean (ko)
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KR20150002910A (en
Inventor
이휘득
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엘지디스플레이 주식회사
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Human Computer Interaction (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Position Input By Displaying (AREA)

Abstract

According to the present invention, an open portion of the touch electrode is formed in an area corresponding to a sub pixel having a low transmittance, thereby reducing a difference in transmittance of each sub pixel, thereby improving luminance and minimizing color shift. A touch panel embedded display device according to an embodiment of the present invention includes a thin film transistor array substrate including a plurality of sub pixels, the thin film transistor being formed for each sub pixel; A color filter array substrate including a color filter formed to correspond to the sub pixel and a black matrix provided between the adjacent sub pixels; A plurality of X electrodes formed on the color filter array substrate and spaced apart from each other at a predetermined interval; And a plurality of Y electrodes formed between the thin film transistor array substrate and the color filter array substrate and spaced apart from each other at predetermined intervals so as to intersect the X electrodes, wherein each of the X electrodes has a transmittance among the plurality of sub pixels. And an open portion formed to expose the lowest sub-pixel.

Description

Touch panel built-in display device {DIODE DISPLAY DEVICE INCLUDING TOUCH PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device with a built-in touch panel, and more particularly, to a display panel with a built-in touch panel capable of minimizing color shift by improving brightness and adjusting color balance.

Recently, there is an increasing demand for adding a touch panel to a display device to recognize a touch part through a human hand or a separate input means and to transmit separate information corresponding thereto.

Typical touch panels include an add-on method attached to an external surface of a display device, an on-cell method for depositing a touch panel on a display device, and a touch panel formed inside the display device. In-Cell method. In particular, the in-cell method includes a touch panel embedded in the organic light emitting diode display, and displays the organic light emitting diode display in comparison to the add-on and on-cell methods. The thickness of the device is thin.

1 is a cross-sectional view of a typical touch panel embedded display device, and illustrates a touch panel embedded liquid crystal display device.

As shown in FIG. 1, a general touch panel embedded liquid crystal display includes a thin film transistor array substrate 10a having a thin film transistor, a color filter array substrate 10c having a color filter, a thin film transistor array substrate 10a and a color filter array substrate ( A liquid crystal layer 10b between 10c). In addition, the touch panel includes an X electrode 20b and a Y electrode 20a which are touch electrodes for sensing an external touch.

In the thin film transistor array substrate 10a, a plurality of sub pixels are defined by crossing gate lines and data lines, and a thin film transistor is formed in each sub pixel. Further, red, green, and blue color filters 12R, 12G, and 12B; 12 are formed on the color filter array substrate 10c so as to correspond to each sub-pixel, and red, green, and blue color filters 12R, 12G, and 12B; A black matrix 11 is formed between 12 to prevent light leakage in the non-display area.

The X electrode 20b and the Y electrode 20a are formed of a transparent conductive material and are insulated from each other with the color filter array substrate 10c interposed therebetween. Specifically, a plurality of X electrodes 20b are formed spaced apart in one direction, and a plurality of Y electrodes 20a are formed spaced apart from each other in the direction crossing the X electrode 20b.

However, the transmittance of light passing through the X electrode 20b to the outside is different for each sub-pixel. Specifically, since the red, green, and blue light implemented through the red, green, and blue color filters 12R, 12G, and 12B; 12 are emitted through the X electrode 20b, the transmittance of each light is different. Color shift occurs. In particular, as the transmittances of red light, green light, and blue light are different, the luminance of the display device is lowered.

The present invention is to solve the above problems, the light emitted from the sub-pixel having a low transmittance is emitted to the outside without passing through the X electrode, thereby reducing the difference in transmittance of each sub-pixel, thereby improving the brightness and color shift It is an object of the present invention to provide a display device with a built-in touch panel that can minimize (color shift).

According to another aspect of the present invention, there is provided a touch panel display device including: a thin film transistor array substrate including a plurality of sub pixels, the thin film transistors being formed for each sub pixel; A color filter array substrate including a color filter formed to correspond to the sub pixel and a black matrix provided between the adjacent sub pixels; A plurality of X electrodes formed on the color filter array substrate and spaced apart from each other at a predetermined interval; And a plurality of Y electrodes formed between the thin film transistor array substrate and the color filter array substrate and spaced apart from each other at predetermined intervals so as to intersect the X electrodes, wherein each of the X electrodes has a transmittance among the plurality of sub pixels. And an open portion formed to expose the lowest sub-pixel.

The open part may be formed to correspond only to a part of the sub-pixel having the lowest transmittance or to correspond to an entire area of the sub-pixel having the lowest transmittance.

The X and Y electrodes may be formed of a transparent conductive material such as tin oxide (TO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc oxide (ZO), and indium tin zinc oxide (ITZO). Ag) is formed of nanowires.

The X electrode and the Y electrode have a double layer or triple layer structure in which the transparent conductive material and a metal selected from silver (Ag), copper (Cu), and aluminum (Al) are stacked.

When the X electrode is formed of indium tin oxide (ITO), the open part is formed to correspond to the blue sub pixel.

When the X electrode includes the aluminum (Al), the open part is formed to correspond to the red sub pixel.

The dummy electrode may further include a dummy electrode formed of the same material as the X electrode in the interval between the plurality of X electrodes.

The Y electrode is formed on the rear surface of the color filter array substrate or on the thin film transistor array substrate.

In the touch panel embedded display device of the present invention as described above, the X electrode formed on the color filter array substrate has an open portion, so that light emitted from the sub-pixel having the lowest transmittance is emitted to the outside through the open portion. Therefore, it is possible to reduce the difference in transmittance of each sub-pixel to achieve color balance. Accordingly, the brightness of the display device can be improved, and display quality can be improved by minimizing color shift.

1 is a cross-sectional view of a general touch panel embedded display device.
2 is a plan view of a touch panel embedded display device according to the present invention.
3A and 3B are enlarged views of region A of FIG. 2.
4A and 4B are cross-sectional views taken along line II ′ of FIG. 3A.
5 is a graph showing light transmittance for each wavelength band of indium tin oxide.
6 is a plan view in which the open portion is formed so as to correspond only to a part of the sub-pixel.
7 is a graph illustrating light transmittance for each wavelength band of the touch panel embedded display device of the present invention.

Hereinafter, a touch panel embedded display device according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a plan view of a touch panel embedded display device according to the present invention. 3A and 3B are enlarged views of region A of FIG. 2, showing only the color filter array substrate, the X electrode, and the sub pixel.

As shown in FIG. 2, the touch panel embedded liquid crystal display according to the present invention includes a thin film transistor array substrate 110a on which a thin film transistor is formed, a color filter array substrate 110c on which a color filter is formed, and a thin film transistor array substrate 110a and a color filter array. It includes a liquid crystal layer (not shown) between the substrate (110c). In addition, the touch panel includes an X electrode 120a and a Y electrode 120b, which are touch electrodes for sensing an external touch.

In the thin film transistor array substrate 110a, a plurality of sub pixels are defined by crossing gate lines and data lines, and a thin film transistor is formed in each sub pixel. In addition, red, green, and blue color filters are formed on the color filter array substrate 110c to correspond to each sub-pixel, and a black matrix is formed between the red, green, and blue color filters to prevent light leakage in the non-display area. do.

The X electrode 120a and the Y electrode 120b are formed to cross each other with the color filter array substrate 110c interposed therebetween. A plurality of X electrodes 120a are provided to be spaced apart from each other at predetermined intervals, and are formed side by side in one direction. In the drawing, the X electrode 120a is formed in the vertical direction. In addition, a plurality of Y electrodes 120b are formed to be spaced apart from each other at predetermined intervals in a direction crossing the X electrodes 120a, and the drawing illustrates a horizontal direction.

The X electrode 120a and the Y electrode 120b have a tin oxide (TO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc oxide (ZO), and indium tin zinc oxide (ITZO) to transmit light. Transparent conductive material such as silver or silver (Ag) nanowires. In particular, when the X electrode 120a and the Y electrode 120b are formed of a transparent conductive material, a metal layer such as silver (Ag), copper (Cu), and aluminum (Al) may be further formed on the transparent conductive material. At this time, the metal layer has a very thin thickness so that light is transmitted.

Specifically, the X electrode 120a and the Y electrode 120b may be formed in a double layer structure of a transparent conductive material-metal layer or in a triple layer structure of a transparent conductive material-metal layer-transparent conductive material. For example, a double layer structure is IZO-Al, IZO-Ag, IZO-Cu, etc., and a triple layer structure is IZO-Al-IZO, IZO-Ag-IZO, IZO-Cu-IZO, etc.

However, in general, the X electrode 120a is formed to overlap the plurality of sub-pixels, so that the light emitted from the plurality of sub-pixels passes through the X electrode 120a and is emitted to the outside. However, since the light passing through the X electrode 120a has a different transmittance for each wavelength band, the transmittance of light emitted from each sub-pixel is different to generate a color shift.

Accordingly, in the touch panel embedded display device of the present invention, as shown in FIGS. 3A and 3B, the X electrode 120a is formed to have the open part 200 in each region corresponding to the subpixel having the lowest transmittance. Accordingly, since light emitted from the sub-pixel having low transmittance is emitted to the outside through the open part 200 of the X electrode 120a, there is no decrease in transmittance by the X electrode 120a.

For example, when the X electrode 120a is formed of ITO having a low light transmittance of a low package, the transmittance of light emitted from the blue sub-pixel B is emitted from the red sub-pixel R and the green sub-pixel G. Lower than the transmittance of light. Thus, as shown in FIG. 3A, the open part 200 of the X electrode 120a is formed to correspond to the blue sub-pixel B. FIG. When the X electrode 120a has a double layer or triple layer structure including Al having a low light transmittance in a high wavelength band, as shown in FIG. 3B, the open part 200 of the X electrode 120a may have a red sub-pixel R. FIG. It is preferable to form so as to correspond to.

In addition, although not shown, since the plurality of X electrodes 120a are formed to be spaced apart from each other, the visibility may be lowered due to the difference in reflectance between the regions where the X electrodes 120a are formed and the regions where the X electrodes 120a are not formed. Therefore, a dummy electrode (not shown) is further formed in a region where the plurality of X electrodes 120a are spaced apart from each other. The dummy electrode is formed of the same material as the X electrode 120a and preferably formed to have the same width as the X electrode 120a. At this time, a touch signal is not applied to the dummy electrode.

4A and 4B are cross-sectional views taken along line II ′ of FIG. 3A, and FIG. 4A shows that the Y electrode is formed on the back of the color filter array substrate, and FIG. 4B shows the Y electrode is formed on the thin film transistor array substrate. .

4A and 4B, the liquid crystal between the thin film transistor array substrate 110a on which the thin film transistor is formed, the color filter array substrate 110c on which the color filter is formed, and the thin film transistor array substrate 110a and the color filter array substrate 110c. Layer (not shown). The plurality of X electrodes 120a and the plurality of Y electrodes 120b are insulated from each other with the color filter array substrate 110c interposed therebetween.

Specifically, the plurality of X electrodes 120a are formed on the color filter array substrate 110c to be spaced apart from each other at a predetermined interval, and the X electrodes (between the thin film transistor array substrate 110a and the color filter array substrate 110c). A plurality of Y electrodes 120b are formed to be spaced apart from each other at regular intervals to intersect 120a). In this case, the Y electrode 120b is formed on the rear surface of the color filter array substrate 110c as shown in FIG. 4A or is formed on the thin film transistor array substrate 110a as shown in FIG. 4B.

At this time, the light passing through the liquid crystal layer 110b passes through the color filter 112 and emits light of a specific wavelength band according to the touch signal sensed by the X electrode 120a and the Y electrode 120b. However, since the transmittance is lowered by the X electrode 120a, each X electrode 120a of the touch panel embedded display device of the present invention may have an open portion formed in an area corresponding to the lowest pixel of the plurality of sub-pixels. 200).

Therefore, the subpixel having the lowest transmittance does not have a decrease in transmittance by the X electrode 120a. In the drawing, the X electrode 120a is formed of ITO, and the open part 200 is formed in a region corresponding to the blue sub-pixel B having the blue color filter 112B.

FIG. 5 is a graph showing light transmittance for each wavelength band of indium tin oxide, and FIG. 6 is a plan view in which the open part is formed to correspond to a part of the sub-pixel.

As shown in FIG. 5, light passing through the ITO has a different transmittance for each wavelength band, and in particular, a light transmittance having a short wavelength (400 nm to 500 nm) is low. Therefore, when ITO is used as a touch electrode, the transmittance of blue light is very low, the overall luminance of the display device is reduced, and color shift occurs, thereby degrading display quality.

In order to overcome the above luminance difference, there is a method of lowering the transmittance of red light and green light similarly to blue light, but in this case, the brightness of the display device is sharply lowered. In this case, therefore, the intensity of the backlight can be increased by designing the sub-pixels asymmetrically or by increasing the number of light sources in order to prevent a decrease in luminance. However, increasing the light source intensity of the backlight increases the driving voltage and also increases the manufacturing cost.

Therefore, in the touch panel embedded display device of the present invention, the X electrode 120a is formed to have the open part 200 in a region corresponding to the subpixel having the lowest transmittance. In this case, the open part 200 is formed in consideration of the transmittance difference between the sub pixel having the lowest transmittance and the other sub pixel. For example, when the transmittance difference is large, the open part 200 is formed to correspond to all of the sub-pixels having the lowest transmittance, and when the transmittance difference is not large, as shown in FIG. It is formed to correspond. In addition, the shape of the open part 200 may be formed in a rectangular shape as shown, or may be formed in a polygonal shape such as a triangle, a square, a circle, an ellipse, or the like.

FIG. 7 is a graph showing light transmittance for each wavelength band of a touch panel embedded display device according to an exemplary embodiment of the present invention, which includes an X electrode formed of indium tin oxide, and is formed to expose only 50% of the blue sub-pixels.

As described above, indium tin oxide has a low light transmittance of short wavelength (400 nm to 500 nm). Therefore, as shown in FIG. 7, when the open portion ITO of the X electrode 120a is formed to correspond to the blue sub-pixel including the blue color filter, there is no decrease in transmittance caused by the X electrode 120a and passes through the blue color filter. The transmittance of blue light emitted to the outside is 90% or more.

Accordingly, the touch panel embedded display device of the present invention can reduce color difference between transmittances of red, green, and blue sub-pixels, thereby achieving color balance. Accordingly, the luminance of the display device can be improved, and color shift can be minimized. In particular, although only red, green, and blue sub-pixels are illustrated in the drawing, the present invention may be applied to a display device further including white sub-pixels.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

100: lower substrate 110a: gate electrode
110b: GIP circuit section 110: gate insulating film
112: semiconductor layer 113a: source electrode
113b: drain electrode 114: planarization film
115a: first electrode

Claims (8)

A thin film transistor array substrate including a plurality of sub pixels, the thin film transistors formed in each of the sub pixels;
A color filter array substrate including a color filter formed to correspond to the sub pixel and a black matrix provided between the adjacent sub pixels;
A plurality of X electrodes formed on the color filter array substrate and spaced apart from each other at a predetermined interval; And
It is formed between the thin film transistor array substrate and the color filter array substrate, and includes a plurality of Y electrodes spaced apart from each other at regular intervals to intersect the X electrode,
Each of the X electrodes may be formed in a portion of the subpixel having the lowest transmittance so as to expose the subpixel having the lowest transmittance among the plurality of subpixels, or open to correspond to the entire region of the subpixel having the lowest transmittance. And a touch panel embedded display device. delete The method of claim 1,
The X and Y electrodes may be formed of a transparent conductive material such as tin oxide (TO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc oxide (ZO), and indium tin zinc oxide (ITZO). Ag) a touch panel embedded display device, characterized in that formed of nanowires. The method of claim 3, wherein
The X electrode and the Y electrode have a double layer or triple layer structure in which the transparent conductive material and a metal selected from silver (Ag), copper (Cu), and aluminum (Al) are stacked. The method of claim 3, wherein
And when the X electrode is formed of indium tin oxide (ITO), the open part is formed to correspond to a blue sub-pixel. The method of claim 4, wherein
And the open part is formed to correspond to a red sub-pixel when the X electrode includes the aluminum (Al). The method of claim 1,
And a dummy electrode formed of the same material as the X electrode in the spaced interval of the plurality of X electrodes. The method of claim 1,
And the Y electrode is formed on a rear surface of the color filter array substrate or on the thin film transistor array substrate.
KR1020130073437A 2013-06-26 2013-06-26 Diode display device including touch panel KR102050446B1 (en)

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KR102288845B1 (en) * 2015-01-12 2021-08-11 삼성디스플레이 주식회사 Display device comprising touch sensor
CN107765475B (en) * 2017-11-15 2019-12-24 京东方科技集团股份有限公司 Color film substrate and display device

Citations (2)

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JP2012043219A (en) * 2010-08-19 2012-03-01 Sony Corp Display unit with touch detection function, and electronic device
US20130147730A1 (en) * 2011-12-08 2013-06-13 Au Optronics Corporation Touch-sensing display panel

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KR20110139616A (en) * 2010-06-23 2011-12-29 엘지디스플레이 주식회사 Liquid crystal display device
KR101859478B1 (en) * 2011-11-30 2018-06-29 엘지디스플레이 주식회사 Liquid crystal display device having touch screen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012043219A (en) * 2010-08-19 2012-03-01 Sony Corp Display unit with touch detection function, and electronic device
US20130147730A1 (en) * 2011-12-08 2013-06-13 Au Optronics Corporation Touch-sensing display panel

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