KR101414641B1 - Display device having touch panel - Google Patents

Abstract

The present invention relates to a display device having a touch panel, and more particularly, to a touch panel display device capable of improving visibility. The present invention relates to a display panel, A first polarization conversion unit located on the display panel and converting light passing through the display panel into a first circularly polarized light state; A touch panel part located on the first polarization conversion part and including at least two transparent conductive layers spaced apart from each other; And a second polarized light converting unit positioned on the touch panel unit and converting the passing light into the first circularly polarized light state.

Touch panel, polarized light, backlight, reflectance, transmittance.

Description

[0001] The present invention relates to a display device having a touch panel,

The present invention relates to a display device having a touch panel, and more particularly, to a touch panel display device capable of improving visibility.

Background Art Portable information processing devices such as portable computers, portable transmission devices, and portable phones perform text and graphics processing using various input devices such as a keyboard, a mouse, and a digitizer.

These input devices are being developed by the necessity of being able to input anybody while carrying the keyboard and the mouse in a simple and small manner with a limited convenience, and also being able to input characters by hand while carrying it.

Today, attention is shifting beyond the level that meets the needs associated with the general functioning of these input devices, such as high reliability, provision of new functions, durability, and manufacturing techniques related to design and fabrication, including materials and materials.

Particularly, a touch panel is used as an input device that is simple, has few erroneous operations, can be input by anyone while being portable, and can input characters without any other input device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a portable device (a cellular phone, a PMP or the like) including a touch panel in which the reflectivity is reduced and the transmittance is increased to decrease the visibility of the device screen by the sunlight and the illumination light in the room And to provide a touch panel display device capable of preventing a touch panel display.

According to a first aspect of the present invention, there is provided a display device comprising: a display panel; A first polarization conversion unit located on the display panel and converting light passing through the display panel into a first circularly polarized light state; A touch panel part located on the first polarization conversion part and including at least two transparent conductive layers spaced apart from each other; And a second polarized light converting unit positioned on the touch panel unit and converting the passing light into the first circularly polarized light state.

According to a second aspect of the present invention, there is provided a liquid crystal display comprising: a liquid crystal display panel including a first linear polarized portion; A first quarter wave plate that works together with the first linear polarization section to convert the passing light into a first circular polarization state; Two or more transparent conductive layers positioned on the first quarter wave plate and / or the transparent film and spaced apart from each other; And a second polarized light converting unit located on the transparent conductive layer and converting the passing light into the first circularly polarized light state.

The present invention has the following effects.

According to the configuration of the present invention, the reflectance of the display device can be reduced and the transmittance can be improved. The effect of reducing the power consumption and enhancing the visibility due to this operation is that when a touch screen is applied to a portable device such as a mobile phone, a PMP Can be maximized.

That is, it is possible to improve the inconvenience of the use of the consumer caused by deterioration of the visibility of the cellular phone screen due to the sunlight and the illumination light in the room in the outdoor environment operation, and at the same time, have.

In addition, since the capacity of the battery is limited in the portable device, and the power consumption is further increased as many functions such as the camera are recently implemented in the portable device such as the mobile phone, the battery usage time is greatly increased .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. Rather, the intention is not to limit the invention to the particular forms disclosed, but rather, the invention includes all modifications, equivalents and substitutions that are consistent with the spirit of the invention as defined by the claims.

It will be appreciated that when an element such as a layer, region or substrate is referred to as being present on another element "on," it may be directly on the other element or there may be an intermediate element in between . It will be appreciated that if a portion of a component, such as a surface, is referred to as " inner ", it means that it is farther from the outside of the device than other portions of the element.

Further, relative terms such as " beneath " or " overlies " are used herein to refer to a layer or region relative to a substrate or reference layer, Can be used to illustrate.

It will be appreciated that these terms are intended to encompass different orientations of the device in addition to those depicted in the Figures. Finally, the term 'directly' means that there are no intervening elements in the middle. As used herein, the term " and / or " includes any and all combinations and all combinations of related items noted.

Although the terms first, second, etc. may be used to describe various elements, components, regions, layers and / or regions, such elements, components, regions, layers and / And should not be limited by these terms.

1, the first polarized light converting unit 201, the touch panel unit 300, and the second polarized light converting unit 202 may be disposed on the display panel 100 in this embodiment.

The first polarized light converting unit 201 converts light emitted from the display panel 100 into a first polarized light state and then passes through the second polarized light converting unit 202 after passing through the touch panel unit 300 And is converted into a polarization state such as the first polarization.

The first polarized light converting unit 201 may convert the light emitted from the display panel 100 into the first circularly polarized light. For example, the first polarized light converting unit 201 may emit light from the display panel 100 To the right-handed circularly polarized light or the left-handed circularly polarized light state.

As an example of the first polarization conversion unit 201, a first linear polarization unit 210 included in or positioned on the display panel 100, a first linear polarization unit 210 disposed on the first linear polarization unit 210, And a quarter wave plate 220.

An example of the second polarized light converting unit 202 includes a second quarter wave plate 230 positioned on the touch panel unit 300 and a second quarter wave plate 230 positioned on the second quarter wave plate 230 And a second linear polarization section 240.

A liquid crystal display panel (LCD) 100 may be used as an example of the display panel 100. The liquid crystal display panel 100 may include an upper polarizer on the liquid crystal cell 110 , This upper polarizer plate can function as the first linearly polarizer 210 described above.

Of course, it is apparent that a plasma display panel (PDP), an organic light emitting device panel (OLED), and various other display panels may be used as the display panel 100 in addition to the liquid crystal display panel. In this case, if the display panel does not include a polarizing plate, a separate first linear polarization section may be provided.

In addition, the lower polarizer 120 may be positioned under the liquid crystal cell 110 as occasion demands, and the liquid crystal cell 110 receives light required for display by the lower backlight unit 130.

The touch panel unit 300 is disposed on the display panel 100. The touch panel unit 300 may be disposed on a substrate 360 made of plastic resin or glass.

1 illustrates a touch panel unit 300 of a static pressure type. The touch panel unit 300 of the static pressure type includes transparent conductive layers 310 and 320 facing each other with an air layer 301 therebetween at regular intervals. And the transparent conductive layers 310 and 320 may be disposed on the first quarter wave plate 220 and the second quarter wave plate 230, respectively.

The transparent conductive layers 310 and 320 may be formed of an ITO (Indium Tin Oxide) film. At this time, the spacer 330 may be positioned in the air layer 301 between the two transparent conductive layers 310 and 320. Spacer 330 may be dotted.

On the other hand, the cover film 350 may be disposed on the uppermost side of the touch panel unit 300, and an optically clear adhesive (OCA) 340 may be disposed on at least a part of the respective layers.

At least one of the linear polarization sections 210 and 240 or the quarter wave plates 220 and 230 constituting the first polarization conversion section 201 or the second polarization conversion section 202 may be a transparent adhesive layer, The touch panel unit 300 can be attached to the touch panel unit 300 by the touch panel unit 340.

As described above, at least some of the touch panel unit 300, the first polarization conversion unit 201, and the second polarization conversion unit may be located on the substrate 360, (100), or they may be transparently attached to one another.

2, the display panel 100 having the above-described touch panel unit 300 may be configured such that light from the outside is incident on the uppermost cover film 350 or the second linear polarization unit 202 of the second polarization conversion unit 202, The Fresnel reflection Rl of the light source 240 is approximately 4%.

In addition, external light reflection of about 6% to 8% can be caused by the reflection of the pressnel by the transparent conductive layers 310 and 320 located in the touch panel unit 300 and the air layer 301 therebetween R2, R3). And the reflection (R4, R5) between the substrate 360 and the display panel 100 may be about 4%.

However, such reflected light can be absorbed without being emitted to the outside by the action of the first polarization conversion section 201 and / or the second polarization conversion section 202, and the reflectance can be greatly reduced. The procedure is as follows.

The light transmitted through the upper second linear polarization section 240 is linearly polarized and passes through the second 1/4 wave plate 230 located above or below the upper transparent conductive layer 320, Polarized light of the upper transparent conductive layer 320 and the surface of the air layer 301 is reflected.

At this time, due to such surface reflection, the polarization direction is changed into a circularly polarized light in the counterclockwise (or clockwise) direction, and the light that is reflected and externally reflected passes through the second 1/4 wave plate 230 The direction of the posterior linearly polarized light is changed and is absorbed by the second linearly polarized portion 240 of the uppermost layer to be 0% reflected. That is, almost no reflection occurs.

With this principle, the polarization direction of light directed to the outside can be changed by reflecting on the surface of the lower transparent conductive layer 310 to make the reflection thereof 0%.

This process is described in more detail as follows. That is, the optical axis between the optical axis of the upper second linear polarization section 240 and the second 1/4 wave plate 230 and the first 1/4 wave plate 220 located on the upper and lower transparent conductive layers 310 and 320, The relationship to

When a liquid crystal display panel (LCD panel) is used as the display panel 100, in consideration of the first linear polarization section 210 included in the panel 100, the light emitted from the panel 100 has a maximum transmittance There are two possibilities for a possible structure to achieve.

3, the first linear polarization section 210 of the first polarization conversion section 201 and the second linear polarization section 240 of the second polarization conversion section 202 are configured to be parallel to each other, It is possible to configure such that the first linear polarization section 210 and the second linear polarization section 240 are orthogonal to each other.

In this case, the principle of reducing or eliminating the reflected light due to external light will be described using Jones vector and Jones matrix as follows.

)이 제2 선형 편광부(240; L₁)에 의해 선형 편광되어 진행할 때(수학식 1), 제2 1/4 파장판(230; M₁)을 통과한 후에는 원형 편광된 광, 예를 들어, 반시계 방향의 광으로 변환된다(수학식 2).First, the principle that reflected light is reduced or eliminated in the course of the light incident from the outside through the "A" path will be described.

Is linearly polarized by the second linear polarizer 240 (L ₁ ) (Equation 1), the circularly polarized light after passing through the second 1/4 wave plate 230 (M ₁ ) And is converted into counterclockwise light (Equation 2).

,

,

)은 그 편광 방향이 시계 방향으로 바뀌게 되며(수학식 3), 제2 1/4 파장판(230; M₁)을 재통과한 후에는 선형 편광의 방향이 바뀌게 되어(수학식 4), 결국은 제2 선형 편광부(240; L₁)를 통과하지 못하고 흡수가 된다(수학식 5). Then, the incident light is partially reflected at the interface between the transparent conductive layer 320 located on the upper side and the air layer 301,

The polarization direction changes in the clockwise direction (Equation 3), and after re-passing through the second 1/4 wave plate 230 (M ₁ ), the direction of the linearly polarized light changes (Equation 4) Is absorbed without passing through the second linear polarization section 240 (L ₁ ) (Equation (5)).

On the other hand, light transmitted without being reflected at the interface between the upper transparent conductive layer 320 and the air layer 301 travels along the "B" path and reflection occurs in the lower transparent conductive layer 310.

The change of the light is similarly solved using the Jones vector and the Jones matrix as shown in the following Equations (6) to (8).

That is, the incident light traveling along the "B" path passing through both the second 1/4 wave plate 230 (M ₁ ) and the first 1/4 wave plate 220 (M ₂ ) .

,

,

This light is reflected by the lower transparent conductive layer 310 and becomes a state as shown in Equation (7).

However, this light is not absorbed by the second linearly polarized portion 240 (L ₁ ) of the upper portion (Equation 8).

As described above with reference to FIGS. 3 and 4, the first polarized light converting unit 201 for converting the passing light into the first circularly polarized light state, and the second polarized light converting unit 201 for converting the light passing through the touch panel unit 300, In the case where the second polarized light converting unit 202 is configured to be in a one-way circular polarization state, the light emitted from the display panel 100 can be emitted to the outside with a low loss rate. That is, the transmittance can be maximized.

The first quarter wave plate 220 included in the second polarized light conversion unit 202 and the first polarized light conversion unit 201 located on the touch screen unit 300 greatly reduces the reflectance of the external light, .

At this time, since the second polarized light converting unit 202 functions to convert the passing light into the circularly polarized light, the light passing through the first polarized light converting unit 201 is converted into circularly polarized light in the same direction .

That is, since the first polarized light converting unit 201 and the second polarized light converting unit 202 have the same polarized state, when light having the above-described configuration is used, the light emitted from the display panel 100 is in a state of minimizing loss It can be exported to the outside.

Accordingly, the first quarter-wave plate 220 of the first polarized light conversion unit 201 located below the touch screen unit 300 can reduce the reflectance of the external light, while reducing the transmittance of the light emitted from the panel 100 Can be improved.

If the first quarter wave plate 220 of the first polarized light converting unit 201 is removed in the state where the liquid crystal display panel 100 is used as the display panel 100 as described above, / 4 < / RTI > wave plate 220 is provided.

That is, the light having passed through the first linearly polarized light converting unit 210 and the second polarized light converting unit 202 appears as shown in Equation (9). If the absolute value is taken, the first quarter wave plate 220 The transmitted light is reduced to 1/2 as compared with the state where the light is transmitted.

On the other hand, a CLC (Cholesteric Liquid Crystal) panel 101 in which circularly polarized light is emitted can be applied to the display panel 100. In this case, as shown in FIG. 5, it can be seen that the display panel 100 includes the first polarization conversion unit 201 that allows the passing light to be in a circularly polarized state in the first state, Therefore, the first linear polarization section 210 and the first quarter wave plate 220 may not be provided. Accordingly, the lower transparent conductive layer 310 may be provided on the transparent film 370.

In this case, as shown in FIG. 6, when the direction of the circularly polarized light emitted upward from the CLC panel 101 is clockwise (right circularly polarized light; RCP), the second 1/4 wavelength The polarization axis of the plate 230 and the second linear polarization section 240 may constitute a clockwise circular polarizer.

That is, CLC panel 101, a right circular second quarter-wave plate of the optical (E _{0_trans_RCP)} of the second polarization conversion unit 202, light emitted from the polarized light; a linear polarized light after transmitted through the (M ₁ 230) (Equation 10), and the polarization axis is aligned in parallel so that the light passes through the second linearly polarized light portion 240 (L ₁ ) again (Equation 11). This light is represented by "F" in Fig.

Expression using the Jones vector and the Jones matrix is expressed by Equations (10) and (11).

,

,

On the other hand, the reflected light along the "G " and" H "paths can be removed in the same manner as in Figs. 3 and 4.

On the other hand, as shown in FIG. 7, the second polarized light converting unit 202 may also be configured such that the light ( _{E0_trans_LCP} ) in which the direction of the circular polarization of the light emitted upward from the CLC panel 101 is counterclockwise (left circularly polarized light) If it is adjusted so as to have a circularly polarized state in the counterclockwise direction, the reflection of the external light can be eliminated and the transmittance can be increased (Equation 12).

This light is represented by "C" in Fig. Similarly, reflected light along the "D" and "E" paths can be eliminated as in the case of FIGS. 3 and 4.

Meanwhile, when the transparent conductive layers 310 and 320 are in contact with each other in the touch panel unit 300, a phenomenon called Newton ring may occur, which is a kind of interference phenomenon when the transparent conductive layers 310 and 320 are in contact with each other. This may adversely affect the image quality of the display.

One of the methods for preventing the phenomenon of Newton ring is to apply scattering to the 1/4 wave plate 220 or 230 or the transparent film 370 in which the transparent conductive layers 310 and 320 or the transparent conductive layers 310 and 320 are formed, To form a structure or to have a scattering function.

The role of such a scattering structure is to form a hologram fine pattern and to remove a Newton ring phenomenon due to interference of light caused by a thin film such as the transparent conductive layers 310 and 320.

8, thin transparent conductive layers 310 and 320 are formed on a 1/4 wave plate 220 or 230 or a film having a laser hologram pattern so that the transparent conductive layers 310 and 320 have a hologram pattern. Scattering structure 380 is formed.

One example of the process of forming such a hologram pattern is to form a photosensitive resin film (not shown) on the quarter-wave plates 220 and 230 or the transparent film 370, and a light source such as a laser beam And irradiating the photosensitive resin film with a light pattern formed thereon, followed by etching.

Typically, the quarter-wave plates 220 and 230 or the transparent film 370 have a thickness of about 50 to 100 mu m, and the width t of the hologram pattern is about several mu m. Since the transparent conductive layers 310 and 320 have a thickness of about 50 nm, the transparent conductive layers 310 and 320 formed on the hologram pattern also have a hologram pattern.

FIG. 9 shows the surface shapes of the transparent conductive layers 310 and 320 having such a hologram pattern.

The scattering structure 380 having the holographic pattern does not affect the phase change of the first polarization conversion unit 201 or the second polarization conversion unit 202, It is possible to prevent the interference phenomenon by the transparent conductive layers 310 and 320 without reducing the reflectivity and increasing the transmittance by the second polarized light converting unit 201 and the second polarized light converting unit 202 without affecting such a function.

FIG. 1 illustrates a resistive type touch panel unit 300 that detects a change in a current or a voltage value at a position depressed by a pressure when a DC voltage is applied. Such a resistance film method is also referred to as a static pressure method.

Meanwhile, as the touch panel unit 300, there are a capacitive type using a capacitance coupling in a state where an AC voltage is applied and a capacitive type using a capacitive coupling in which a selected position in a state in which a magnetic field is applied is sensed by a change in voltage Electro Magnetic type can also be used.

Depending on the respective methods, the problem of signal amplification, the difference in resolution, and the difference in difficulty of the design and processing techniques are different, and the method can be selected so as to take advantage of the advantages. The selection criterion may be durability and economics in addition to optical characteristics, electrical characteristics, mechanical characteristics, environmental characteristics, and input characteristics.

The touch panel unit 300 of the resistive film type shown in FIG. 1 is formed together with the liquid crystal display panel 100 and widely used as an input device such as an electronic notebook, a PDA, and a portable PC, and is thin, compact, lightweight, It is known as an advantageous design method compared to other methods in power and the like.

The touch panel unit 300 having a resistive film structure is formed on the substrate 360 when the substrate 360 having the upper electrode (transparent conductive layer) 320 is brought into contact with a point by an input means such as a pen or a finger The pair of transparent conductive layers 310 and 320 formed are mutually energized, read the voltage value changed by the resistance value at the position, and find the position coordinate according to the variation of the potential difference in the control part.

FIG. 10 shows an embodiment in which the capacitive touch panel unit 300 is applied. The difference from the static pressure method shown in FIG. 1 is that transparent conductive layers 311, 312, and 313 are stacked on the plurality of transparent films 371 between the two quarter-wave plates 220 and 230.

FIG. 10 shows an embodiment in which three transparent films 371 are provided with transparent conductive layers 311, 312, and 313, respectively. Here, the two conductive layers 311 and 312 of the conductive layers 311, 312 and 313 are connected to each other to form a grid in the transverse direction.

That is, the conductive layer includes a first layer 311 that includes a plurality of lines in a first axis (x-axis) direction parallel to each other, and a plurality of second layers 311 that are parallel to each other and perpendicular to the first axis And a third layer 313, which serves as a ground under the second layer 312, may be located.

As described above, the touch panel unit 300 of the capacitive type senses a touch by using a capacitance coupling in the state of applying an AC voltage. The touch panel unit 300 senses the touch of the conductive layers 311, 312, and 313 The position can be detected using a grid.

The first polarized light converting unit 201 and the second polarized light converting unit 202 are located on the upper and lower sides of the capacitive touch panel unit 300 as in the case of the static pressure type embodiment.

At this time, the cover film 350 may be positioned on the structure including the touch panel unit 300, the first polarization conversion unit 201, and the second polarization conversion unit 202, And a transparent adhesive layer 340 may be disposed on at least a part of each of the layers.

The structure located on the substrate 360 can maintain a certain distance from the display panel 100. [ As in the above-described embodiment, a liquid crystal display panel can be used for the display panel 100. The liquid crystal panel can be positioned such that the first linear polarization section 210 is integrated on the liquid crystal cell 110, The linear polarization unit 120 may be provided on the lower side of the substrate 110.

Of course, as with the above-described embodiments, it is possible to use a plasma display panel (PDP), an organic light emitting device panel (OLED), and various other display panels in addition to the liquid crystal display panel Do.

In the display device including the capacitive touch panel unit 300, the ratio of the reflected light to the external light incident from the outside will be described as follows.

First, about 4% reflection can be made in the cover film 350 of the uppermost layer. After passing through, the light passes through the three transparent conductive layers 311, 312, and 313 at 0.1% The reflected light can be emitted to the outside.

Further, the light transmitted through the lower surface of the substrate 360 and the upper surface of the display panel 100 are reflected by about 1.6%, resulting in a total reflection of about 3.2%.

Therefore, in this embodiment, about 7.5% of reflection may occur, and the reflected light is greatly reduced compared with the state where the first polarization conversion section 201 and the second polarization conversion section 202 are not applied. For example, the reflected light in the state where the first polarized light converting unit 201 and the second polarized light converting unit 202 are not applied is approximately 18%.

In Fig. 11, transparent conductive layers 311, 312 and 313 are formed between the upper and lower surfaces of a transparent film 371 such as PET resin, and two quarter wave plates 220 and 230 located on the transparent film 372, Is shown in Fig.

Here, the lower quarter wave plate 220 belongs to the first polarization conversion unit 201, the upper quarter wave plate 230 belongs to the second polarization conversion unit 202, and the upper one / 4 wave plate 230, the second linear polarization section 240 is positioned.

Such a structure can be placed on the substrate 360, and other matters are the same as in the case of FIG.

The reflected light in such a structure is reflected by approximately 4% in the top cover film 350 and approximately 1.7% in the three transparent conductive layers 311, 312 and 313, And a reflection of 3.2% on the upper surface of the display panel 100 is generated.

Therefore, in this embodiment, a total reflection of about 8.9% may occur, and the reflected light is still greatly reduced compared to a state in which the first polarization conversion section 201 and the second polarization conversion section 202 are not applied.

12 and 13 show an embodiment in which the structures corresponding to those of FIGS. 10 and 11 are integrally implemented.

That is, a structure including the touch panel unit 300, the first polarization conversion unit 201, and the second polarization conversion unit 202 is located on the substrate 360, And a transparent adhesive layer 340, which are integrated with each other. The other structures are the same as those of Figs. 10 and 11, respectively.

Since the reflected light in the structure as shown in FIG. 12 has an integral structure, the reflection on the lower side of the substrate 360 and the upper side of the display panel 100 can be ignored, And reflection of 0.3% at the three transparent conductive layers 311, 312, and 313 together, a total of 4.3% of reflected light can be emitted to the outside.

13, the reflection on the lower side of the substrate 360 and the upper side of the display panel 100 can be neglected, so that the reflected light of 5.7%, which is 3.2% reduced in the case of FIG. 11, . ≪ / RTI >

Meanwhile, in the electrostatic capacity type embodiment as shown in FIGS. 10 to 13, the operation of maximizing the transmittance through which the light emitted from the display panel 100 is transmitted to the outside is the same as the embodiment of the static pressure method described above.

FIG. 14 shows that a polarizing backlight 130 may be provided when a liquid crystal display panel is used as the display panel 100.

The polarized light backlight 130 includes a polarization-selective outcoupling layer 134 or is configured to emit polarized light so as to supply light in one polarization state to the display panel 100.

14, when the backlight 130 is composed of the light source 131 and the light guide plate 132 which is laterally incident on the light source 131 so as to be guided to the upper side, the light guide plate 132 The P-polarized light is recycled in the light guide plate 132, and the polarized light component is converted into the S-polarized light so that light emitted through the light guide plate 132 Polarized light component of the polarized light component into S-polarized light.

As described above, the operation of converting the light having one polarization component can be performed through a pattern provided on the light guide plate 132, as shown in FIGS.

That is, the P-polarized light can be converted into the S-polarized light while proceeding in the light guide plate 132 by the pattern 133 having the directionality in the predetermined direction on the lower surface or the upper surface of the light guide plate 132.

Since the polarized light of the incident light is aligned with the polarizing axis of the polarizer included in the display panel 100, the light transmittance of the backlight 130 using the polarized light component is doubled Or more.

That is, when the components of the S polarized light and the P polarized light are mixed, the transmittance may be reduced to half while the light is transmitted through the display panel 100. However, as described above, If the state is adjusted, the transmittance can be greatly improved.

Therefore, the display device can realize twice the light brightness with the same power, and the power consumption can be reduced by half in order to realize the same brightness. These advantages can reduce power consumption in portable mobile devices, that is, devices such as mobile phones and media players such as PMPs, thereby increasing battery usage time.

The reduction of the reflectance, the reduction of the power consumption due to the improvement of the transmittance, and the improvement of the visibility described above can be maximized when a touch screen is applied to a portable device such as a mobile phone, a PMP, or the like.

That is, it is possible to improve the inconvenience of the use of the consumer caused by deterioration of the visibility of the cellular phone screen due to the sunlight and the illumination light in the room in the outdoor environment operation, and at the same time, have.

The capacity of a battery is limited in a portable device, and recently, a portable device such as a mobile phone has more functions such as a camera, so that the amount of power used is increased. However, when the embodiment of the present invention is applied The battery usage time can be greatly increased.

The specific effect of such visibility enhancement can be known from ACR (Ambient Contrast Ratio) data. There are two standards for this bright room contrast, and they can be expressed as follows.

First, one standard is referred to as the CIE 145 standard, which is defined as Equation (13). Where L _W is the luminance value of the full screen white and L _K is the black value in the dark room.

ACR C = (L _W -L _K ) / (L _W + (L _K / 3))

In the case of a display device including an ordinary touch panel portion in the case where the ACR value is measured by this standard and the first polarization conversion portion 201 and the second polarization conversion portion 202 of the above embodiment are not applied, The L _W value was measured as 2319 nits, and the L _K value was measured as 1914 nits. Therefore, in the case of Equation (13), the bright room contrast value was measured to be 0.136.

On the other hand, when the first polarized light conversion unit 201 and the second polarized light conversion unit 202 described in the present embodiment are applied, the L _W value is measured as 506.3 nits and the L _K value is measured as 90.73 nits, Is increased to 0.774.

In addition, another standard for bright room contrast is the NIST FPDM, which is defined by Equation (14).

Here, the bright-room contrast C represents a contrast value when the ambient light is E0, _{and the} values of? _W and? _K are expressed by Equations (15) and (16), respectively.

Here, L _h and L _d represent the luminance of white and black of the display device (FPD), respectively, and E _h and E _d represent the illuminance values at this time, respectively.

More specifically, as shown in FIG. 17, the bright-room contrast value is a value obtained by dividing a sphere on the display device FPD, The measured value is shown.

In the above equations (15) and (16), L _h and L _d represent the luminance of white and black of the display device (FPD) measured at the surface of the sphere, respectively. Also, E _h is kL _wh and E _d is kL _wd , where L _wh and L _wd represent the luminance of white and black measured on the wall side of the sphere, respectively.

In the case of a display device including an ordinary touch panel portion in the case where the ACR value is measured by this standard and the first polarization conversion portion 201 and the second polarization conversion portion 202 of the above embodiment are not applied, When the L _W value was 2319 nit and the L _K value was 1914 nit, the bright room contrast (C) value was 1.21.

On the other hand, when the first polarized light conversion unit 201 and the second polarized light conversion unit 202 described in the present embodiment are applied, when the L _W value is 506.3 nit and the L _K value is 90.73 nit, C) value was greatly increased to 5.58.

Therefore, when such a bright room contrast measurement value is taken into consideration, an effect that the visibility is improved by 4.6 times to 5.5 times or more can be obtained.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is natural to belong to the scope.

1 is a sectional view showing a first embodiment of the present invention.

2 is a schematic view showing a process of reflecting light.

Figs. 3 and 4 are schematic views showing the operation according to the first embodiment. Fig.

5 is a cross-sectional view showing a second embodiment of the present invention.

Figs. 6 and 7 are schematic views showing the operation according to the second embodiment. Fig.

8 is a schematic view showing a scattering layer provided in the touch panel unit.

9 is a photograph of the scattering layer.

10 is a cross-sectional view showing a third embodiment of the present invention.

11 is a cross-sectional view showing a fourth embodiment of the present invention.

12 is a sectional view showing a fifth embodiment of the present invention.

13 is a sectional view showing a sixth embodiment of the present invention.

Fig. 14 is a schematic diagram showing the action of a polarization backlight. Fig.

15 is a schematic view showing an example of a polarization backlight.

16 is a plan view showing an example of a polarization backlight.

17 is a schematic view showing a measurement environment of bright room contrast.

Claims (30)

A display panel; A first polarization conversion unit located on the display panel and converting light passing through the display panel into a first circularly polarized light state; A touch panel part located on the first polarization conversion part and including at least two transparent conductive layers spaced apart from each other; A second quarter wave plate disposed on the touch panel unit and a second quarter wave plate disposed on the second quarter wave plate, the second quarter wave plate positioned on the touch panel unit and making light passing therethrough into the first circularly polarized light state, And a second linearly polarized light converting part including a second linearly polarizing part, The second quarter wave plate converts the light having passed through the second linear polarization section into circularly polarized light in the first direction and transmits the light reflected from the transparent conductive layer in a circularly polarized light direction opposite to the first direction To the touch panel display device. The apparatus of claim 1, wherein the first polarized- A first linear polarizer positioned on the display panel; And And a first quarter wave plate positioned on the first linear polarization section. delete delete delete The touch panel display device of claim 1, wherein the optical axis of the second linear polarizer is the same as the optical axis of the first linear polarizer. The touch panel display device of claim 6, wherein the second quarter wave plate has a phase difference of 90 degrees with the first quarter wave plate. The touch panel display apparatus according to claim 1, wherein the optical axis of the second linear polarized section is orthogonal to the optical axis of the first linear polarized section. The touch panel display device of claim 8, wherein the second quarter wave plate has the same phase as the first quarter wave plate. The touch panel display device of claim 2, wherein the display panel is a liquid crystal display panel including a liquid crystal cell. The touch panel display device of claim 10, wherein the first linearly polarized portion is included in the liquid crystal display panel. The touch panel display device of claim 10, wherein the liquid crystal display panel further comprises a lower polarizer plate below the liquid crystal cell. The touch panel display device of claim 10, wherein the liquid crystal display panel includes a polarizing backlight. 14. The touch panel display apparatus according to claim 13, wherein the polarizing backlight irradiates light of a first polarization state to the liquid crystal display panel. 15. The touch panel display device of claim 14, wherein the polarization backlight includes a light guide plate for converting light in a second polarization state into light in the first polarization state. The touch panel display apparatus according to claim 10, wherein the first polarization conversion unit is included in the liquid crystal display panel. The touch panel display device of claim 1, wherein the transparent conductive layer is disposed on a quarter wave plate or a transparent film included in the first polarized light conversion unit or the second polarized light conversion unit. 18. The touch panel display device of claim 17, wherein the transparent conductive layer comprises a scattering structure. 19. The touch panel display device of claim 18, wherein the scattering structure is located on the 1/4 wave plate or the transparent film having the hologram pattern. The transparent conductive layer according to claim 1, A first layer comprising a plurality of mutually parallel first axial lines; And a second layer including a plurality of lines in a second axial direction that are parallel to each other and perpendicular to the first axis. The transparent conductive layer according to claim 1, A pair of conductive layers facing each other with an air layer therebetween; And a spacer positioned between the pair of conductive layers. delete Transparent cover; A touch panel portion including at least two transparent conductive layers spaced apart from each other; A second linear polarization section provided between the transparent cover and the touch panel section, and a second polarization conversion section composed of a second 1/4 wavelength plate, The second linear polarization section linearly polarizes the light incident on the touch panel section in the transparent cover, The second quarter wave plate converts the light having passed through the second linear polarization section into circularly polarized light in the first direction and transmits the light reflected from the transparent conductive layer in a circularly polarized light direction opposite to the first direction To the touch panel display device. delete 24. The touch panel of claim 23, further comprising: a display unit positioned below the touch panel unit; Further comprising a first linearly polarized portion provided between the touch panel portion and the display portion, and a first polarized light converting portion including a first quarter wave plate. The touch panel display device of claim 25, wherein an optical axis of the second linear polarized portion is the same as an optical axis of the first linear polarized portion. The touch panel display device of claim 25, wherein the second quarter wave plate has a phase difference of 90 degrees with the first quarter wave plate. 26. The touch panel display device of claim 25, wherein the optical axis of the second linearly polarized portion is orthogonal to the optical axis of the first linearly polarized portion. The touch panel display device of claim 28, wherein the second quarter wave plate has the same phase as the first quarter wave plate. Transparent cover; A touch panel portion including at least two transparent conductive layers spaced apart from each other; A display unit positioned below the touch panel unit; A linear polarizing unit disposed between the touch panel unit and the display unit for linearly polarizing light incident from the outside, and light incident in one direction are circularly polarized in one direction, and the incident light is circularly polarized in the other direction / 4 wave plate, wherein the polarized light converting unit comprises:

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