KR101055713B1 - Liquid crystal display filter having a touch input sensing function and a liquid crystal display device having the same - Google Patents

Abstract

The present invention relates to a display filter having a touch input sensing function, wherein the display filter having a touch input sensing function includes an optical substrate including a base substrate disposed in front of a display panel displaying an image, and an antireflection layer stacked on the base substrate. And a vibration sensing unit installed in the filter unit and the optical filter unit and sensing a vibration generated from the contact position of the optical filter unit as the contact factor contacts any position of the optical filter unit.

Description

Liquid crystal display filter having a touch input sensing function and a liquid crystal display device having the same {LCD FILTER HAVING TOUCH INPUT AND LCD DEVICE HAVING THE SAME}

The present invention relates to a liquid crystal display filter having a vibration sensing type touch input sensing function in which information of a contact position is input by sensing vibration and a liquid crystal display device having the same.

Display devices are developing in various forms with the development of information society.In recent years, display devices have been developed in various forms such as liquid crystal display (LCD), plasma display panel (PDP), electro luminescent display (ELD), and vacuum fluorescent display (VFD). Various display devices are developed, and some of them are used as display devices in various devices.

For example, a liquid crystal display (LCD) uses an array substrate and a color filter substrate to form a thin film transistor and a pixel electrode, and a color filter substrate to form a color filter and a common electrode, respectively. It forms, and is completed through the liquid crystal cell process through a liquid crystal between these two board | substrates. These LCDs are equipped with a shield or a filter to protect the display panel in front of the display panel.

As another example of the display device, the PDP generates a discharge in the gas between the electrodes by a direct current or an alternating voltage applied to the electrode, and excites the phosphor by the radiation of ultraviolet light, which emits light.

Due to its driving characteristics, the PDP device has a high emission amount of electromagnetic waves and near infrared rays, high surface reflection of the phosphor, and color purity does not reach the cathode ray tube due to the orange light emitted from the encapsulated helium (He) or xenon (Xe). . Therefore, electromagnetic waves and near-infrared rays generated in the PDP device may adversely affect the human body and cause malfunction of precision devices such as a wireless telephone or a remote controller.

Therefore, it is desired to suppress the emission of electromagnetic waves and near infrared rays emitted from the PDP apparatus below a predetermined value. To this end, in order to shield electromagnetic waves and near infrared rays, and to reduce reflected light and improve color purity, filters having functions such as electromagnetic shielding, near infrared shielding, light surface reflection prevention and / or color purity improvement are employed.

Currently, display devices are becoming larger, and are used for outdoor use not only for indoors but also for advertisement or information transmission.

In addition, the display apparatus is provided with an input apparatus that allows a user to directly input information through the display apparatus, instead of unilaterally transferring information, thereby achieving two-way communication.

Such input devices are mainly used as input methods for inputting information while viewing information displayed on a display screen using a remote controller, and input methods for directly inputting information by installing an input device on a display surface.

Currently, when an input device for inputting information by directly contacting a large display device is installed, the input device is provided separately from the display device, and an input device is attached to the surface of the display device to use the input device. There is a problem that the fall of the thickness of the display device, the thickness of the display device, and the use of the input device is separated from the display surface as the use period is increased. In addition, when the LCD display device is used for outdoor use, there is a problem in that a temperature rises in the display panel due to sunlight and malfunctions such as phase transition of liquid crystal are generated through noise such as infrared rays.

On the other hand, recently, there is a trend to adopt a protective glass to protect the display filter in LCD monitors / TVs. However, when the protective glass is used in the LCD monitor / TV, condensation may occur inside the LCD monitor / TV due to a temperature difference inside / outside the protective glass. In general, in the case of PDP, heat is dissipated from the surface of the PDP module immediately after the power-on, and condensation can be easily and quickly removed. However, in the case of LCD, it is fundamentally difficult to remove condensation due to less heat dissipation in the LCD module.

An object of the present invention is to provide a display filter having a touch input function together with a display filter function and a display device having the same.

Another object of the present invention is to provide a display filter incorporating a vibration sensing touch input device for detecting and detecting a touched position with a display filter and a display device having the same.

Another object of the present invention to provide a display filter and a display device having the same that can minimize the thickness of the filter.

Still another object of the present invention is to provide a display filter having an anti-fog function and a display device having the same.

Still another object of the present invention is to provide a display filter and a display device having the same, which can block external noise causing a malfunction of the outdoor display device.

In order to achieve the above object, a display filter having a touch input sensing function according to an aspect of the present invention, an optical including a base substrate disposed in front of the display panel for displaying an image, and an antireflection layer laminated on the base substrate And a vibration sensing unit installed in the filter unit and the optical filter unit and sensing a vibration generated from the contact position of the optical filter unit as the contact factor contacts an arbitrary position of the optical filter unit.

The display filter having a touch input sensing function according to the present invention includes a piezoelectric sensor for detecting a vibration generated from a contact position of the optical filter part by installing a vibration sensing unit adjacent to each corner of the optical filter part, and detecting a vibration from the piezoelectric sensor. It includes a control unit for receiving a signal to calculate the contact position.

The display filter having a touch input sensing function according to the present invention is characterized in that the optical filter unit further comprises a conductive film layer in which a metal thin film and a high refractive index transparent film are laminated a plurality of times on the surface of the display panel piece of the base substrate.

The display filter having a touch input sensing function according to the present invention further includes an anti-fog layer which absorbs moisture generated in an internal space between the display panel and the optical filter part and prevents the fogging of the surface of the optical filter part. It features.

According to the above configuration, the present invention is integrally provided with a vibration sensing contact input device for inputting information by sensing the position contacted with the display filter to input information by directly contacting the display screen while minimizing the thickness of the filter. There is an advantage to this.

In addition, the present invention is to detect the contact position by the vibration to input information, it is unnecessary to the ITO film, etc. of the resistive-type input device, it is possible to operate even if there is a scratch or foreign matter, electrostatic that is a disadvantage of the capacitive input device There is an advantage that can be operated even if the non-conductor without contact.

In addition, the present invention has a useful effect that the base substrate for supporting each layer of the filter serves as a support of the touch panel to minimize the thickness of the filter.

In addition, the transparent electrode layer of the present invention is implemented by a conductive film layer in which a metal thin film and a high refractive index transparent thin film are laminated on the surface of the display panel piece of the base substrate a plurality of times, thereby useful effects that can block external noise causing malfunction of the outdoor display device. There is.

In addition, the present invention has a useful effect of preventing the blurring of the display filter facing the display panel by forming the anti-fogging layer in front of the display panel.

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

1 is a configuration diagram of a display apparatus having a display filter according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the display filter according to the first embodiment of the present invention.

The display apparatus according to the first exemplary embodiment of the present invention includes a display panel 300 for displaying information and a display filter 100 disposed at the front of the display panel 300 to simultaneously perform a filter function and an information input function. Include.

As shown in FIG. 2, the display filter 100 according to the first embodiment includes a base substrate 110, an anti-reflection layer 120, an electromagnetic shielding layer 130, and color correction on the surface of the base substrate 110. And a display filter 100 in which at least one functional layer of the layers 140 is stacked, and a touch input device installed in the display filter 100 to detect the contacted position with vibration and input information.

The base substrate 110 may be a transparent substrate. Specifically semi-tempered glass can be used. In addition, a transparent polymer resin such as polycarbonate (PC) or polyethylene terephthalate (PET) may be used. The base substrate 110 preferably has high transparency having a visible light transmittance of 80% or more and heat resistance having a glass transition temperature of 50 ° C or more.

The base substrate 110 may be a polymer molded article or a laminate of the polymer molded article. Examples thereof include polyethylene terephthalate (transparent), polysulfone (PS), polyether sulfone (PES), polystyrene, polyethylene naphthalate, Polyarylate, polyether ether ketone (PEEK), polycarbonate (PC), polyflopropylene (PP), polyimide, triacetyl cellulose (TAC), polymethyl methacrylate (PMMA) and the like.

The base substrate 110 supports each layer that performs a filter function such as the color correction layer 140 and the electromagnetic shielding layer 130, and vibrations such as bending wave vibration generated from the vibration sensing sensor of the contact input device. Simultaneously plays a role to support the That is, the base substrate 110 supports each functional layer that performs a filter function as one substrate and serves as a contact plate for supporting the vibration sensor, thereby reducing the overall thickness of the display device and reducing manufacturing costs. It becomes possible.

The touch input device is installed at a corner of the display filter 100 to contact the display filter 100 to detect the sensors 200a and 200b for detecting the vibration of the contacted position, and information applied from the sensors 200a and 200b. It includes a control unit for calculating the contact position using.

Although only two sensors 200a and 200b are shown in the figure, in general, at least three sensors are required to two-dimensionally determine the contact input position, and four sensors may be preferable. . The sensors 200a and 200b may preferably use piezoelectric sensors capable of detecting a vibration indicating a contact input to the base substrate 110. In one example, the piezoelectric device may use PZT crystals.

The sensors 200a and 200b may be installed on one surface of the contact surface contacting to input information of the display filter 100 and the other surface opposite thereto. As another example, one or more sensors may be installed on one surface of the display filter 100 and the other sensors may be installed on the other surface of the display filter 100.

The sensors 200a and 200b may be installed on any one of various functional layers stacked on the surface of the base substrate 100 as well as the base substrate 110.

Optionally, one or more sensors may be changed at contact input such as modified vibrations sensed by the sensors to emit a signal that can be sensed by other sensors or to determine a contact location to be used as a reference signal. It can be used as an emitter device to generate vibrations. The sensors 200a and 200b may be attached or bonded to either the base substrate 110 or one of the functional layers adhered to the base substrate 110 by an adhesive or other means.

Sensors 200a and 200b are particularly suitable for detecting and determining contact positions from flexural wave vibrations, as disclosed in WO 2003 005292 and WO 0148684.

Sensors 200a and 200B are particularly suitable for use in the display device of the present invention because of their sensitivity, relatively low cost, adequate strength, potentially small shape coefficients, adequate stability and response linearity. Other sensors that can be used in the vibration sensing contact input device include, among others, electrodistortion, magnetostriction, piezoelectric influence, and moving coil type.

Piezoelectric elements used as sensors 200a and 200b generally take one of two forms for vibration sensing applications. The first form is a unimorph device that responds to compression on each axis. The second is a curvature sensitive bimorph device consisting of two unimorphs arranged to have opposite polarities. The type of sensor used is selected depending on the material of the sensor. When the substrate experiences bending due to the bending wave, for example, the surface of the base substrate is placed into curvature and compressed. The ratio of curvature to compression depends on the thickness and stiffness of the substrate. As the substrate is made to be thicker and have greater stiffness, the curvature decreases (due to the larger bending wave) and surface compression increases (due to the surface further away from the neutral axis) for a given frequency and amplitude disturbance. As a result, unimorph sensors can be more sensitive than bimorph sensors on panels with greater thickness and stiffness, and vice versa.

Since the display device of the present invention is typically rectangular, it is common and convenient to use a rectangular contact device. As such, the contact plate to which the sensor is attached is typically rectangular in shape. In the present invention, the vibration sensors 200a and 200b may be disposed adjacent to corners of the base substrate 110 serving as a contact plate. Since many applications require the display device to be viewed through the contact input device, it is desirable to place the sensors adjacent the edge of the base substrate 110 so that the sensors do not undesirably encroach the observable display area. When the sensors are disposed at the corners of the base substrate 110, the influence due to the reflection from the edge of the display panel may be reduced. In the case of the vibration sensor arbitrarily disposed along the edge of the base substrate 110, the signal received due to the contact of the first wave and the vibration wave packet reflected later delayed from the edge of the base substrate 110 It is sum. The proximity of the sensor or contact input to the edge of the base substrate determines the separation distance of the direct signal to the first reflected signal. Positioning the sensor at the edge helps to separate the primary and reflected signals for better contact detection by increasing the separation distance of the sensor from possible reflection boundaries.

The shape of the sensors 200a and 200b may also be important. It is desirable for the sensor to have an omnidirectional response, ie the sensor response is relatively less sensitive to the direction of vibration propagation. Sensors with strong angle dependence may undesirably complicate correlation calculations for contact positions from the received signal. To study the angle dependence of the piezoelectric sensor response, the sensor can be driven to act as an emitter. The outgoing wave can then be measured using a laser vibrometer. The angle dependence of the piezoelectric device as an emitter may be correlated to the expected angle dependence of the piezoelectric device as a sensor. Under this analysis, long piezoelectric transducers, such as those having a long rectangular shape or an elliptic shape, may be determined to provide better omnidirectionality compared to square or circular transducers, especially when attached to the edge of the substrate. For example, a rectangular transducer with a length-to-width aspect ratio of approximately 3: 1, bonded adjacent to the edge of a rectangular plate made of soda lime glass and whose long axis is inclined at 45 degrees to the edge of the base substrate, emits a very symmetrical wave when driven. do.

Related to the angular sensitivity is the angular symmetry of the response provided by the sensor. The long axis of the long piezoelectric transducer is the axis with the highest sensitivity. By aligning the axis with the largest sensitivity in the long piezoelectric sensor at an angle of 45 degrees with the edge of the rectangular base substrate and placing the sensor adjacent to the edge of the base substrate, a symmetrical sensitivity can be obtained. When such a sensor is to face along one edge of the base substrate, the vibration propagating in the direction of the edge of the base substrate is orthogonal and can be sensed with greater sensitivity than the propagating vibration. By orienting the sensor such that the axis with the largest sensitivity is about 45 degrees relative to the base substrate edge, a high degree of symmetry can be obtained, particularly when using long sensors.

The sensor area (the product of length and width), material and thickness may be chosen so that the device achieves higher sensitivity while satisfying other constraints such as reducing the boundary area of the contact panel. The sensitivity of the piezoelectric device is determined from the discussion of energy.

On the one hand there is strain energy introduced into the piezoelectric element, on the other hand there is electrical energy stored when the capacitive load of the piezoelectric element is increased to a given voltage. Since the piezoelectric effect is efficient, the sensitivity of the device can be determined by setting these amounts equally. Improvements in sensitivity may be particularly useful when using thick and / or rigid panels, such as glass plates, which are characteristic of those used in many touch sensing applications. For this type of contact plate, the contact of a finger or stylus produces a relatively small flexural wave displacement in the panel and therefore a sensitivity transducer is preferred.

The sensor size may be selected in consideration of the following factors. The length and width of the sensor may be chosen so that the sensors do not undesirably erode the visible area. In addition, the length of the sensor must be considered potentially when the flexion wave vibration is to be sensed to determine the contact position, compared to the desired range of the wave length. At the limit where the length of the sensor exceeds the critical bending wave wavelength, the sensitivity of the sensor begins to drop because the operation on the base substrate caused by these bending waves tends to exceed the length of the piezoelectric element on average. Exemplary piezoelectric sensors typically have a length less than the oscillation wavelength in the critical peak wavelength band. In the flexural wave application of the present invention, a rectangular piezoelectric sensor having a length of about 7 mm and a width of about 3 mm may be used as an example.

Since the height of the sensor can complicate incorporation of the contact device into the display device, the sensor can be selected so as not to excessively increase the thickness of the display panel. For example, a rectangular piezoelectric sensor about 1 mm high can be used.

In addition to selecting the size (length, width, height) of the flexural wave sensor to improve the strain energy in the material and thus the sensor's sensitivity, piezoelectric material formulations can be selected to improve performance. The material formulation determines the capacity of the sensor, which in turn is a factor in determining the voltage produced at a given charge. In an exemplary embodiment, the sensor material composition may be selected to reduce sensor capacity and increase voltage sensitivity by reducing the dielectric constant. An exception to this law may exist in situations where the dielectric constant is reduced down to a reduction in piezoelectric efficiency, in which case the expected benefit of sensitivity may be lost. The choice of piezoelectric formulation is therefore preferably made by harmonizing these concerns. One suitable piezoelectric crystal material is lead-zirconate-titanat (PZT).

The anti-reflection layer 120 may be disposed at the outermost side of the viewer's viewing direction to minimize external reflection of external light incident on the display surface from the outside, thereby preventing display quality degradation due to light reflection.

The anti-reflection layer 120 may cope with a hard coating layer that protects the display from external impact, and a hard coating layer may be stacked on the surface of the anti-reflection layer 120. The anti-reflection layer 120 may be configured by stacking a near infrared ray blocking film and a neon light shielding film in addition to the surface antireflection film.

The electromagnetic wave shielding layer 130 is formed on the bottom surface of the base substrate 100 to shield electromagnetic waves. A multilayer transparent conductive film in which a conductive mesh film or a metal thin film and a high-thickness-transparent transparent film is laminated may be used.

Here, as the conductive mesh film, a metal coated with a grounded metal mesh, a synthetic resin, or a metal fiber mesh may be used. As the material of the metal constituting the conductive mesh film, any metal may be used as long as it is a metal having excellent electrical conductivity and workability such as copper, chromium, nickel, silver, molybdenum, tungsten, and aluminum.

In addition, the multilayer transparent conductive film may be a high refractive transparent thin film represented by indium tin oxide (ITO) to shield the electromagnetic waves. Multilayer transparent conductive films include metal thin films such as gold, silver, copper, platinum, and palladium, and multilayer thin films in which a high refractive index transparent thin film such as indium oxide, ditin oxide, and zinc oxide is alternately laminated.

As the metal thin film, a thin film layer made of silver (Ag) or an alloy containing silver may be used. In particular, silver is mainly used because of its excellent visible light transmittance when conductive, infrared reflecting, and multilayer lamination are performed. However, since silver has low chemical and physical stability and deteriorates due to pollutants, water vapor, heat, light, etc. of the surrounding environment, an alloy containing at least one metal such as gold, platinum, palladium, copper, indium, and tin is used. It is desirable to.

On the rear surface of the electromagnetic shielding layer 130, a color correction layer 140 for changing or adjusting color balance by reducing or adjusting the amount of red (R), green (G), and blue (G) may be combined. . The color correction layer 140 may be formed by stacking a near infrared ray shielding layer and a neon light shielding layer, or may include a dye for shielding near infrared ray and neon light.

In general, the red visible light generated from the plasma in the panel assembly tends to appear orange. The color correction layer 140 according to the embodiment of the present invention may reduce or exclude the role of color correction of the orange color to red by having a transmittance of 60% or more with respect to the orange color having a wavelength range of 580 to 600 nm.

The color correction layer 140 may use various pigments to increase the color reproduction range of the display and to improve the sharpness of the screen. Kinds of pigments used in the color correction layer include an organic pigment having an neon light shielding function such as anthraquinone, azo, stryl, phthalocyanine, and methine, and various pigments may be applied. The type and concentration of the dye is determined by the absorption wavelength of the dye, the absorption coefficient, and the permeation characteristics required for the display, and therefore are not limited to specific values.

An adhesive layer may be used when pasting each of the functional layers described above. Examples of such an adhesive layer include acrylic adhesives, silicone adhesives, urethane adhesives, polyvinyl butyral adhesives (PMB), ethylene-vinyl acetate adhesives (EVA), polyvinyl ethers, saturated amorphous polyesters, melamine resins, and the like. Can be.

3 is a cross-sectional view of a display filter according to a second embodiment of the present invention.

The display filter according to the second embodiment has the same structure as the display filter described in the first embodiment, and further includes an external light shielding layer 400 for absorbing external ambient light.

The external light shielding layer 400 includes a support 410, a substrate 420 formed on one surface of the support 410, and external environment light formed in the substrate 420 and introduced into the display panel 300 from the outside. It includes a light blocking pattern 430 for blocking. In the present exemplary embodiment, the light blocking pattern 430 is composed of a plurality of wedge-shaped black strips that are spaced apart from each other at regular intervals.

The substrate 420 may be formed directly on the side of the base substrate 110, but may be combined with the base substrate 110 after forming the substrate 420 on the support 410. The support 410 supports the substrate 420 on which the light blocking pattern 430 is formed. The support 410 is preferably a transparent resin film having ultraviolet ray permeability. As the material of the support 232, for example, polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC) and the like may be used. Of course, the support 410 may be a film having an inherent function of a filter, for example, an antireflection layer 120, a color correction layer 140, or an electromagnetic shielding layer 130. In addition, the light blocking pattern 430 has a wedge shape in cross section, and a plurality of black stripe patterns are formed on one surface of the substrate 420 facing the display panel 300 at regular intervals to be spaced apart from each other. It serves to prevent the inflow into. The substrate 420 may be formed of an ultraviolet curable resin, and the light blocking pattern 430 may be formed of a black inorganic material and / or an organic material and a metal that may absorb light. Particularly, in the case of metal, since the electrical conductivity is high, that is, the electrical resistance is low, when the light shielding pattern 430 is formed by adding the metal thin film, the light shielding pattern 430 may be controlled because the electrical resistance may be adjusted according to the concentration of the metal powder. Electromagnetic shielding function can be performed. Furthermore, when the surface is black or using black metal, the external light shielding function and the electromagnetic shielding function can be efficiently implemented. As the light shielding pattern 430, an ultraviolet curable resin containing carbon may be used.

The light shielding pattern 430 of the present invention is a roll molding method, a heat press method using a thermoplastic resin, or an injection molding by filling a thermoplastic or thermosetting resin in a substrate 420 having a shape opposite to that of the light shielding pattern 430. It may be formed by a molding method or the like. In addition, when the ultraviolet curable resin constituting the substrate 420 has an antireflection function, an electromagnetic wave shielding function, a color control function, or a combination thereof, the external light shielding layer 400 may additionally perform these functions. .

The light shielding pattern 430 constituting the external light shielding layer 400 absorbs external environmental light to prevent external environmental light from entering the display panel 300 and totally reflects incident light from the display panel 300 toward the viewer. Do it. Thus, a high transmittance to visible light and a high contrast ratio can be obtained.

4A and 4B are cross-sectional views illustrating display filters according to third and fourth embodiments of the present invention.

The display display filter 500 according to the third and fourth embodiments is a filter (protective plate) applied to an LCD (Liquid Crystal Display), and the display filter 500 has a structure in which a vibration sensing contact input device is integrally provided. Is showing. The display filter 500 according to the third and fourth embodiments is not limited to a liquid crystal display (LCD) but may be applied to any display.

Referring to FIG. 4A, a display filter 500 having a touch input sensing function according to the present invention includes a base substrate 510, a first anti-reflection layer 520 formed on one surface of the base substrate 510, and a base substrate. The second anti-reflection layer 530 formed on the other surface of the 510 and the base substrate 510, the first anti-reflection layer 520, and the second anti-reflection layer 530 are provided and in contact with each other. It includes sensors (200a, 200b) for detecting the vibration to input information.

In general, the LCD display filter 500 includes a base substrate 510, a first anti-reflection layer 520 bonded to one surface of the base substrate 510 by an adhesive layer, and the other surface of the base substrate 510. And a second anti-reflection layer 530 bonded by an adhesive layer or the like. Here, the base substrate 510 serves as a protective plate of the LCD panel and a contact plate of the sensors 200a and 200b.

Since the sensors 200a and 200b are the same as the sensors 200a and 200b described in the embodiment, description thereof is omitted. The sensors 200a and 200b may be installed on at least one of the base substrate 510, the first antireflection layer 520, and the second antireflection layer 530. For example, some sensors may be installed on the first anti-reflective layer 520, others may be installed on the second anti-reflective layer 530, some sensors may be installed on the base substrate 510, and others may be installed on the first anti-reflective layer ( 520 and the second anti-reflection layer 530.

Referring to FIG. 4B, the display filter 500 having a touch input sensing function according to the present invention includes a base substrate 510, an anti-reflection layer 520 formed on one surface of the base substrate 510, and a base substrate 510. At least one of the conductive film layer 540, the adhesive layer 550, the anti-fog layer 560, the base substrate 510, the first anti-reflection layer 520, or the conductive film layer 530 formed on the other side of the It is installed on the floor and includes a sensor (200a, 200b) for sensing the contact position by the vibration to input information.

The conductive film layer 540 may be implemented as a multilayer film in which a metal thin film and a high refractive index transparent thin film are stacked multiple times on the surface of the display panel piece. The metal thin film may be implemented with gold, silver, copper, platinum, and palladium, and the high refractive index transparent thin film may be implemented with indium oxide, tin tin oxide, zinc oxide, or the like. Particularly, when conductive, infrared reflecting, and multilayered layers are formed of a metal thin film, it is preferable to implement silver (Ag) or an oxide containing silver having high visible light transmittance.

The anti-fog layer 560 absorbs moisture generated in the internal space between the display panel and the display filter to prevent the anti-fog of the display filter. In one example, the anti-fogging layer 560 may be implemented as a polyester film implemented as a hydrophilic coating layer containing water, polyvinylpyrrolidone, and a surfactant.

5 is a plan view showing an example of a sensor applied to the display filter of the present invention.

According to another exemplary embodiment, the sensor may include long rectangular piezoelectric sensors 610a, 610b, 610c, and 610d positioned adjacent to four corners of the display filter 600 when the display display filter 600 included in the display device is a rectangular substrate. Can be configured.

The sensors may be arranged such that each axis with the highest sensitivity is oriented along an angle of 45 degrees with respect to adjacent edges of the display filter 600.

6 is a perspective view of a sensor applied to the display filter of the present invention, in which the sensors 720 are installed at four corners of the display display filter 700, and the sensor 720 of the display display filter 700 is mounted. A foam mounting body 710 is attached along one side edge.

An adhesive surface may be formed on the foam mounting body 710 to be firmly fixed to the surface of the display display filter 700. The foam mount 710 can reduce reflection at the edge of the display display filter 700. In addition, the piezoelectric vibration sensors 720 may be rectangular and may be mounted such that the long axis of the sensors faces toward an adjacent edge of the display display filter 700.

The display display filters 600 and 700 of FIGS. 5 and 6 may use any one of the display display filters described in the first, second and third embodiments, and the sensor may be described in the first embodiment. Piezoelectric vibration sensors can be applied.

7 is an enlarged view illustrating a portion where a sensor is mounted on a display display filter. The sensor 810 is characterized by its length (L), width (W) and its height or thickness, as well as by its position relative to the edge of the display filter 800 and the angle (θ) of which the sensitive axis forms the edge of the substrate. Can be erased.

8 is a partial plan view showing a wire for electrically connecting a sensor and a controller of the present invention.

On the surface of the display filter 900, a pair of wires 920 and 930 for electrically connecting the controller 910 and the control unit installed at each corner of the display filter 900 and the controller are printed.

Here, the wirings 920 and 930 are preferably printed on the edge of the display filter 900 so as not to cover the display effective screen on which the image is displayed.

When the sensor 910 is stressed under the influence of vibrations propagating in the panel under the influence of individual contacts, a charge gradient is created in the piezoelectric material, causing a voltage drop across the thickness of the material. By connecting the wirings 910 and 920 to the electrodes on the top and bottom of the piezoelectric sensor, the piezoelectric sensor signal can communicate with a control unit (not shown) for the calculation and interpretation of the signal to determine the contact location. Piezoelectric devices are available when the electrodes on one side of the piezoelectric device are wound to extend a little on the other side of the piezoelectric device so that the wiring can be more conveniently connected due to both electrodes accessible on the same side of the device.

9 is a plan view showing the wiring structure printed on the surface of the display filter of the present invention. Sensors 910a, 910b, 910c, and 910d provided at four corners of the display filter 900 are connected to a pair of wires 910a and 920a, 910b and 920b, 910c, and 920c, 910d, and 920d, respectively. Each pair of wires extends along an edge of the display filter 900 to an area where the tail 940 can be connected. The tail 940 may provide a convenient means for connecting the wires to a controller (not shown) for determining and reporting the position of the contact input by using the information collected from each sensor by detecting the bending wave vibration caused by the contact.

Up to now, for convenience of description, the filter for PDP and the filter for LCD have been described, but the present invention is not limited thereto. For example, the vibration sensing contact input device of the present invention can be applied to any display applied filter for displaying an image.

1 is a block diagram of a display device having a display filter according to a first embodiment of the present invention;

2 is a cross-sectional view showing a display filter according to a first embodiment of the present invention;

3 is a cross-sectional view showing a display filter according to a second embodiment of the present invention;

4A and 4B are cross-sectional views illustrating display filters according to third and fourth embodiments of the present invention;

5 is a plan view showing an example of a sensor applied to the display filter of the present invention,

6 is a perspective view showing an example of a sensor applied to the display filter of the present invention;

7 is a partial plan view showing an example of a sensor applied to the display filter of the present invention;

8 is a partial plan view showing the wiring of the sensor applied to the display filter of the present invention;

9 is a plan view showing the wiring and the tail arrangement of the sensor applied to the display filter of the present invention.

Claims (15)

Used for liquid crystal display device with a built-in liquid crystal display panel, A base substrate disposed in front of the liquid crystal display panel; An optical filter unit including an anti-reflection layer stacked on the base substrate; And A vibration sensing unit installed in the optical filter unit and sensing vibration generated from a contact position of the optical filter unit as a contact factor contacts an arbitrary position of the optical filter unit; Including, The optical filter unit: An anti-fogging layer laminated on the base substrate to absorb moisture generated in a space between the liquid crystal display panel and the optical filter part to prevent fogging of the surface of the optical filter part; Liquid crystal display filter having a touch input detection function further comprising. The method of claim 1, wherein the optical filter unit: At least one layer of an electromagnetic shielding layer, a near infrared shielding layer, a neon light shielding layer, or a color correction layer laminated on a surface of the liquid crystal display panel piece of the base substrate; Liquid crystal display filter having a touch input detection function further comprising. The method of claim 2, wherein the optical filter unit: An electromagnetic wave shielding layer or a near-infrared shielding layer, a neon light shielding layer, or a color correction layer stacked on a surface of the liquid crystal display panel piece of the base substrate; It is laminated on the electromagnetic shielding layer, and further comprising an external light shielding layer for absorbing external environmental light Liquid crystal display filter with touch input detection. The method of claim 1, wherein the optical filter unit: A conductive film layer in which a metal thin film and a high refractive index transparent thin film are laminated on the surface of the liquid crystal display panel piece of the base substrate a plurality of times; Liquid crystal display filter having a touch input detection function further comprising. delete delete The vibration sensing device of claim 1, wherein the vibration sensing unit comprises: A piezoelectric sensor installed at a position adjacent to each corner of the optical filter unit to detect vibration generated from a contact position of the optical filter unit; And A control unit which receives a vibration detection signal from the piezoelectric sensor and calculates a contact position; Liquid crystal display filter having a touch input detection function further comprising. The method of claim 7, wherein The piezoelectric sensor is rectangular in shape, and has a touch input sensing function, characterized in that it is disposed in the diagonal direction of the optical filter portion. The method of claim 7, wherein And the piezoelectric sensor has a length to width aspect ratio of 3: 1. The method of claim 7, wherein And the piezoelectric sensor is disposed at an angle of 45 degrees with an adjacent edge of an edge of the optical filter unit. The method of claim 7, wherein The piezoelectric sensor includes four sensors installed at four corners of the liquid crystal display filter, respectively. The method of claim 11, And at least one of the piezoelectric sensors acts as a vibration emitter. The method of claim 7, wherein And a wire connecting the control unit and the piezoelectric sensor is printed on a surface of the base substrate. A liquid crystal display filter having a touch input sensing function according to any one of claims 1 to 4; And A liquid crystal display panel for emitting display light to the liquid crystal display filter; Liquid crystal display device comprising a. A liquid crystal display filter having a touch input sensing function according to claim 7; And A liquid crystal display panel for emitting display light to the liquid crystal display filter; Liquid crystal display device comprising a.

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