KR20150002910A - Diode display device including touch panel - Google Patents

Diode display device including touch panel Download PDF

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Publication number
KR20150002910A
KR20150002910A KR20130073437A KR20130073437A KR20150002910A KR 20150002910 A KR20150002910 A KR 20150002910A KR 20130073437 A KR20130073437 A KR 20130073437A KR 20130073437 A KR20130073437 A KR 20130073437A KR 20150002910 A KR20150002910 A KR 20150002910A
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South Korea
Prior art keywords
sub
electrode
array substrate
pixel
pixels
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KR20130073437A
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Korean (ko)
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KR102050446B1 (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

Abstract

The present invention relates to a touch panel built-in display device capable of reducing the difference in transmittance of each sub-pixel by forming an open portion of a touch electrode in an area corresponding to a sub-pixel having a low transmittance, thereby improving luminance and minimizing color shift The present invention relates to a touch panel built-in type display device, including: a thin film transistor array substrate having a plurality of sub-pixels defined therein and including thin-film transistors formed for each of the sub-pixels; A color filter array formed to correspond to the sub-pixels, and a black matrix provided between adjacent sub-pixels; A plurality of X electrodes formed on the color filter array substrate and spaced apart from each other at regular intervals; 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 regular intervals so as to intersect with the X electrodes, And an open portion formed to expose the lowest sub-pixel.

Description

DISPLAY DEVICE INCLUDING TOUCH PANEL [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device having a touch panel, and more particularly, to a touch panel built-in display device capable of improving luminance and minimizing color shift by adjusting a color balance.

2. Description of the Related Art In recent years, there has been an increasing demand for adding a touch panel capable of recognizing a touch region through a human hand or a separate input means to a display device and transmitting additional information corresponding thereto.

Typical touch panels include an add-on type in which the touch panel is attached to the outer surface of a display device, an on-cell type in which a touch panel is deposited on the display device, And an in-cell system. Particularly, the in-cell method is a method in which a touch panel is incorporated in an organic light emitting diode display device, and an organic light emitting diode display (OLED) is used in comparison with an add-on method and an on- The thickness of the device is thin.

1 is a cross-sectional view of a conventional touch panel built-in type display device, which shows a touch panel built-in type liquid crystal display device.

1, a general touch panel built-in liquid crystal display device includes a thin film transistor array substrate 10a on which a thin film transistor is formed, a color filter array substrate 10c on which a color filter is formed, a thin film transistor array substrate 10a, And a liquid crystal layer 10b between them. And 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 a gate wiring and a data wiring crossing each other, and a thin film transistor is formed in each sub-pixel. The red, green, and blue color filters 12R, 12G, and 12B are formed on the color filter array substrate 10c so as to correspond to the respective sub pixels. The black matrix 11 is formed between the pixel electrodes 11 and 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 therebetween. Specifically, a plurality of X electrodes 20b are formed in one direction, and a plurality of Y electrodes 20a are formed in a direction crossing the X electrodes 20b.

Incidentally, the transmittance of light passing through the X electrode 20b and emitted to the outside is different for each sub-pixel. Specifically, the red light, the green light, and the blue light realized through the red, green, and blue color filters 12R, 12G, and 12B are emitted through the X electrode 20b, A color shift occurs. In particular, as the transmittance of red light, green light, and blue light is different, the brightness of the display device decreases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an organic light emitting display device, in which light emitted from a sub-pixel having a low transmittance is emitted to the outside without passing through an X- The present invention provides a touch panel built-in display device capable of minimizing color shift.

According to another aspect of the present invention, there is provided a touch panel built-in display device including: a thin film transistor array substrate having a plurality of sub-pixels defined therein and including thin film transistors formed in each sub-pixel; A color filter array formed to correspond to the sub-pixels, and a black matrix provided between adjacent sub-pixels; A plurality of X electrodes formed on the color filter array substrate and spaced apart from each other at regular intervals; 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 regular intervals so as to intersect with the X electrodes, And an open portion formed to expose the lowest sub-pixel.

The open portion is formed so as to correspond to only a part of the sub-pixel having the lowest transmittance, or is formed to correspond to the entire region of the sub-pixel having the lowest transmittance.

The X electrode and the Y electrode may be formed of a transparent conductive material such as TO (Tin Oxide), ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ZO (Indium Zinc Oxide), ITZO (Indium Tin Zinc Oxide) Ag) nanowires.

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

When the X electrode is formed of ITO (Indium Tin Oxide), the open portion is formed to correspond to the blue sub-pixel.

When the X electrode includes the aluminum (Al), the open portion corresponds to the red sub-pixel.

And 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 back surface of the color filter array substrate or on the thin film transistor array substrate.

In the above-described touch panel built-in display device of the present invention, the X electrode formed on the color filter array substrate is formed to have an open portion, and light emitted from the sub-pixel having the lowest transmittance is emitted to the outside through the open portion. Therefore, the difference in transmittance of each sub-pixel can be reduced, and the color balance can be adjusted. Accordingly, the brightness of the display device can be improved, and the color shift can be minimized to improve the display quality.

1 is a sectional view of a general touch panel built-in type display device.
2 is a plan view of a touch panel built-in display device according to the present invention.
Figs. 3A and 3B are enlarged views of region A in Fig.
4A and 4B are sectional views of I-I 'of FIG. 3A.
5 is a graph showing the light transmittance of indium tin oxide by wavelength band.
6 is a plan view in which the open portion corresponds to only a part of the sub-pixel.
7 is a graph showing the light transmittance by wavelength band of the touch panel built-in display device of the present invention.

Hereinafter, a touch panel built-in type display device of the present invention will be described in detail with reference to the accompanying drawings.

2 is a plan view of a touch panel built-in display device according to the present invention. 3A and 3B show only the color filter array substrate, the X electrode, and the sub-pixel in the enlarged view of the area A in Fig.

2, the touch panel built-in liquid crystal display device of 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, a thin film transistor array substrate 110a, And a liquid crystal layer (not shown) between the substrates 110c. The X electrode 120a and the Y electrode 120b are touch electrodes for sensing an external touch.

In the thin film transistor array substrate 110a, a plurality of sub-pixels are defined by intersecting gate and data wirings, and a thin film transistor is formed in each sub-pixel. The red, green, and blue color filters are formed on the color filter array substrate 110c so as to correspond to the respective sub-pixels. A black matrix is formed between the red, green, and blue color filters to prevent light scattering in the non- 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. The plurality of X electrodes 120a are spaced apart from each other at regular intervals and are formed in parallel in one direction. In the drawing, the X electrode 120a is formed in a vertical direction. The Y electrodes 120b are spaced apart from each other at regular intervals in a direction crossing the X electrodes 120a, and are formed in the horizontal direction in the drawing.

The X electrode 120a and the Y electrode 120b may be formed of a transparent conductive material such as tin oxide (ITO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc oxide (ITO), indium zinc oxide (ITZO) 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 through which light is transmitted.

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

In general, the X electrode 120a is formed to overlap with a plurality of sub-pixels, and the light emitted from the plurality of sub-pixels passes through the X electrode 120a and is emitted to the outside. Since the transmittance of the light passing through the X electrode 120a differs for each wavelength band, the transmittance of light emitted from each sub-pixel is different, causing a color shift.

Therefore, as shown in FIGS. 3A and 3B, the touch panel built-in display device of the present invention forms the X electrode 120a so as to have the open portion 200 for each region corresponding to the sub-pixel having the lowest transmittance. Accordingly, the light emitted from the sub-pixel having a low transmittance is emitted to the outside through the open portion 200 of the X electrode 120a, so that the transmittance by the X electrode 120a is not reduced.

For example, when the X electrode 120a is formed of ITO having a low transmittance of low parasitic band, 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 Is lower than the transmittance of light. Therefore, as shown in FIG. 3A, the open portion 200 of the X electrode 120a is formed to correspond to the blue sub-pixel B. 3B, the open portion 200 of the X electrode 120a is divided into the red sub-pixel R and the red sub-pixel R, as shown in FIG. 3B, in the case where the X electrode 120a is a double layer or triple layer structure including Al having a low light transmittance at a high wavelength. As shown in Fig.

Also, although not shown, a plurality of X electrodes 120a are spaced apart from each other, so that the visibility may be lowered due to the difference in reflectance between the region where the X electrode 120a is formed and the region where the X electrode 120a is not formed. Accordingly, 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 is preferably formed to have the same width as the X electrode 120a. At this time, no touch signal is applied to the dummy electrode.

FIGS. 4A and 4B are cross-sectional views taken along a line I-I 'in FIG. 3A, FIG. 4A shows a Y electrode formed on a rear surface of a color filter array substrate, and FIG. 4B shows a Y electrode formed on a thin film transistor array substrate .

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

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

At this time, the light having passed through the liquid crystal layer 110b according to the touch signal sensed by the X electrode 120a and the Y electrode 120b passes through the color filter 112 and emits light of a specific wavelength band. Since the transmittance is lowered by the X electrode 120a, each X electrode 120a of the touch panel built-in type display device of the present invention has an open portion formed in a region corresponding to the sub-pixel having the lowest transmittance among the plurality of sub- 200).

Therefore, the transmittance of the sub-pixel having the lowest transmittance is not reduced by the X electrode 120a. In the drawing, the X electrode 120a is formed of ITO, and the open portion 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 the light transmittance of indium tin oxide by wavelength, and FIG. 6 is a plan view of the open portion corresponding to only a part of the sub-pixel.

As shown in Fig. 5, the light passing through the ITO has a different transmittance for each wavelength band, and particularly a low light transmittance for a short wavelength (400 nm to 500 nm). 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 a color shift occurs, thereby deteriorating the display quality.

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

Accordingly, in the touch panel built-in type display device of the present invention, the X electrode 120a is formed to have the open portion 200 in the region corresponding to the sub-pixel having the lowest transmittance. At this time, the open portion 200 is formed in consideration of the difference in transmittance between the sub-pixel having the lowest transmittance and the other sub-pixels. For example, when the transmittance difference is large, the open portion 200 is formed so as to correspond to all the sub-pixels having the lowest transmittance. When the transmittance difference is not large, as shown in FIG. 6, Respectively. In addition, the shape of the open portion 200 may be formed in a rectangular shape, or may be formed in a polygonal shape such as a triangle shape, a square shape, or a circular shape, an elliptical shape, or the like.

FIG. 7 is a graph showing light transmittance according to wavelengths of a touch panel built-in display device of the present invention, which includes an X electrode formed of indium tin oxide, and an open portion of the X electrode is formed to expose only 50% of the blue subpixel.

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

Therefore, the touch panel built-in display device of the present invention can reduce the difference in transmittance between the red, green, and blue sub-pixels, and can adjust the color balance. Accordingly, the brightness of the display device can be improved, and the color shift can be minimized. In particular, although only red, green, and blue sub-pixels are shown in the drawing, the present invention is also applicable to a display device including a white sub-pixel.

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 general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

100: lower substrate 110a: gate electrode
110b: GIP circuit part 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 having a plurality of sub-pixels defined therein and including thin-film transistors formed for each of the sub-pixels;
A color filter array formed to correspond to the sub-pixels, and a black matrix provided between adjacent sub-pixels;
A plurality of X electrodes formed on the color filter array substrate and spaced apart from each other at regular intervals; And
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 regular intervals so as to intersect with the X electrodes,
Wherein each of the X electrodes has an open portion formed to expose the sub-pixel having the lowest transmittance among the plurality of sub-pixels. The method according to claim 1,
Wherein the open portion is formed so as to correspond to only a portion of the sub-pixel having the lowest transmittance or to correspond to the entire region of the sub-pixel having the lowest transmittance. The method according to claim 1,
The X electrode and the Y electrode may be formed of a transparent conductive material such as TO (Tin Oxide), ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ZO (Indium Zinc Oxide), ITZO (Indium Tin Zinc Oxide) Ag) nanowires on the surface of the touch panel. The method of claim 3,
Wherein the X electrode and the Y electrode are a double layered structure or a triple layered 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 when the X electrode is formed of ITO (Indium Tin Oxide), the open portion corresponds to the blue sub-pixel. 5. The method of claim 4,
Wherein when the X electrode includes the aluminum (Al), the open portion corresponds to the red sub-pixel. The method according to claim 1,
And a dummy electrode formed of the same material as the X electrode in a spacing interval of the plurality of X electrodes. The method according to claim 1,
Wherein 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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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160087044A (en) * 2015-01-12 2016-07-21 삼성디스플레이 주식회사 Display device comprising touch sensor
CN107765475A (en) * 2017-11-15 2018-03-06 京东方科技集团股份有限公司 Color membrane substrates and display device

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Publication number Priority date Publication date Assignee Title
KR20110139616A (en) * 2010-06-23 2011-12-29 엘지디스플레이 주식회사 Liquid crystal display device
JP2012043219A (en) * 2010-08-19 2012-03-01 Sony Corp Display unit with touch detection function, and electronic device
KR20130060883A (en) * 2011-11-30 2013-06-10 엘지디스플레이 주식회사 Liquid crystal display device having touch screen
US20130147730A1 (en) * 2011-12-08 2013-06-13 Au Optronics Corporation Touch-sensing display panel

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
KR20110139616A (en) * 2010-06-23 2011-12-29 엘지디스플레이 주식회사 Liquid crystal display device
JP2012043219A (en) * 2010-08-19 2012-03-01 Sony Corp Display unit with touch detection function, and electronic device
KR20130060883A (en) * 2011-11-30 2013-06-10 엘지디스플레이 주식회사 Liquid crystal display device having touch screen
US20130147730A1 (en) * 2011-12-08 2013-06-13 Au Optronics Corporation Touch-sensing display panel

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Publication number Priority date Publication date Assignee Title
KR20160087044A (en) * 2015-01-12 2016-07-21 삼성디스플레이 주식회사 Display device comprising touch sensor
CN107765475A (en) * 2017-11-15 2018-03-06 京东方科技集团股份有限公司 Color membrane substrates and display device
WO2019095749A1 (en) * 2017-11-15 2019-05-23 京东方科技集团股份有限公司 Color film substrate and display device

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