KR101808523B1 - Optical Touch Input Device and Driving Method for the Same - Google Patents

Abstract

The present invention relates to an optical touch input device and a driving method thereof that prevent optical interference of a sensor portion corresponding to adjacent lens portions by sequential driving, and a driving method thereof. The driving method of an optical touch input device includes: Sequentially lighting a plurality of infrared light emitting elements arranged on a side of the light emitting element; And receiving light reflected through the lens sections disposed at the third and fourth sides of the display panel through a sensor section including a plurality of pixels corresponding to the first and second sides, do.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical touch input device and a method of driving the same,

The present invention relates to an optical touch input apparatus, and more particularly, to an optical touch input apparatus and a method of driving the same that prevent optical interference of a sensor unit corresponding to an adjacent lens unit by sequential driving.

2. Description of the Related Art Generally, a touch screen is one of various methods of configuring an interface between an information communication device and a user using various displays, and is an input device that allows a user to interface with a device by directly touching the screen with a hand or a pen .

Since the touch screen is an input device that can be easily used by both sexes by interactively and intuitively manipulating the buttons displayed on the display by simply touching the buttons with the finger, it is now possible to use the issuance devices of banks and public offices, various medical equipment, It is applied in many fields such as guide of the institution, traffic guidance.

Such a touch screen has a resistive type, a capacitive type, an ultrasonic wave type, and an infrared type according to a method of recognizing the touch screen.

Although the advantages of each of the above-described methods are different from each other, an infrared type touch screen has recently been attracting attention because of minimizing the pressure applied to the touch surface and facilitating the placement.

The infrared touch screen can also be classified into an infrared matrix method and an infrared camera sensing method according to the arrangement structure of the light source and the light source and the number thereof.

A specific method may be preferred depending on the size of the display panel and the flow of the fluid at the time of assembly. Among them, the infrared matrix method includes a plurality of infrared ray emitting sources, a sensor unit, and a lens unit disposed at a position opposite to the infrared ray emitting source .

Hereinafter, a conventional infrared matrix type touch screen will be described with reference to the drawings.

1A is a view showing a distribution and a reflection path of light reflected when a light emitting source and an actual lens are opposed to each other. FIG. 1B shows a case where a light emitting source of FIG. FIG. 2 is a plan view showing a light interference phenomenon.

1B, a conventional infrared matrix type touch screen includes a display panel 5, light emitting portions 10a and 10b formed corresponding to the two sides of the display panel 5, sensor portions 20a and 20b, And a lens unit 30a formed in correspondence with the other two sides of the display panel 5. The light emitting portions 10a and 10b and the sensor portions 20a and 20b, respectively, are provided in the X and Y axis directions to take charge of light emission and light reception in the corresponding directions.

In the lens unit 30a facing the light emitting units 10a and 10b, light incident from the light emitting unit is reflected and collected into the sensor units 20a and 20b.

Here, the light emitting portions 10a and 10b are formed in a one-to-one relationship with respect to the lenses provided in the lens portion 30a.

However, since the curvature of the lens portion 30a and the wide angle of the light emitting portion 10a are limited to less than 180 degrees, the path of the light collected by the sensor portions 20a and 20b is a straight line . That is, since the light is radiated from the edge of the lens portion 30a, the light is reflected and emitted, so that in the sensor portions 20a and 20b provided with a plurality of pixels, the light in the regions 40a corresponding to the adjacent lens portions 30a Interference occurs. Therefore, in the pixels 25 corresponding to the adjacent lens portions 30a, it is difficult to accurately detect the position due to the interference of the light reflected by the adjacent lens portions in addition to the light that enters the region itself. That is, not only the lens in its own region but also the light from the lens in the relative region can be collected.

For example, when an area is divided into a, b, c, and d for each lens provided in the lens unit 30a, there is optical interference as in 40a corresponding to the adjacent parts of a and b, There is optical interference as in 40b corresponding to the adjacent portion, and optical interference as shown in 40c may occur corresponding to the adjacent portions of c and d.

Therefore, it is difficult to accurately sense the touch of the pixels 25 where the different lenses correspond to the adjacent areas.

FIG. 2 is a graph showing the light receiving information actually sensed when the first light emitting element among the light emitting elements positioned on the X-axis is ON-driven and the remaining light emitting elements are driven off by each pixel of the sensor unit.

FIG. 2 is a view showing a state in which light receiving information sensed by an actual image sensor (sensor unit) is transmitted to the first light emitting element when the first light emitting element of the X-axis light emitting elements of FIG. It can be seen that the amount of light is partially sensed in the pixels corresponding to the remaining second through fourth light emitting devices LED_X2, LED_X2, and LED_X3 as well as the corresponding pixel in the second LED_X1.

In this case, the amount of received light generated in the corresponding pixels in the second to fourth light emitting elements is an unintended value, and if it is touched, accurate touch sensing can not be performed due to optical interference.

The conventional infrared touch screen has the following problems.

In the case where the light emitting portion and the sensor portion are disposed on the adjacent two sides of the display panel and the lens portion is disposed on the other two sides of the display panel and the light emitted from the light emitting portion is reflected back to the sensor portion to receive the light to sense the touch, The light collected by the sensor portion is radiated without going straight, and enters the sensor portion.

Therefore, in addition to the linear light coming from the lens unit opposed to each other, the light coming in the radial direction is collected into the pixels of the sensor unit. This means that even when a substantial touch is made, the light is not totally blocked, and there is light emitted therefrom, which means that the part that should be completely blocked when touching can also be radiated. In this case, even if there is a touch, the touch is not detected due to the radiation, and the accuracy of the touch detection is lowered.

It is an object of the present invention to provide an optical touch input device and a method of driving the same that prevent light interference of a sensor unit corresponding to an adjacent lens unit by sequential driving.

According to another aspect of the present invention, there is provided an optical touch input device including a plurality of infrared light emitting elements arranged at adjacent first and second sides of a display panel, A sensor unit including a plurality of pixels, the pixels corresponding to the first side and the second side of the display panel and receiving light reflected from the lens unit on a pixel by pixel basis; And a touch controller for applying a lighting control signal for sequentially lighting the plurality of infrared light emitting elements.

The lighting control signal is alternately applied to the odd-numbered light-emitting element and the even-numbered light-emitting element so as to be sequentially driven.

Alternatively, the light emission control signal is applied to sequentially drive the plurality of infrared light emitting devices.

Alternatively, the light-up control signal is applied to one of a plurality of infrared light-emitting elements provided on the first side and a plurality of infrared light-emitting elements provided on the second side so as to be sequentially turned on.

Meanwhile, the touch controller applies a light receiving control signal to the sensor unit to divide the pixels of the sensor unit into a plurality of blocks for each arrangement interval of the infrared light emitting devices and sequentially receive the blocks. At this time, the application of the light receiving control signal can be made to receive only the corresponding blocks of the illuminated infrared light emitting elements.

The touch controller may divide the pixels of the sensor unit into a plurality of blocks for each arrangement interval of the lenses provided in the lens unit, and apply a light reception control signal to sequentially receive the pixels in block units.

The sensor unit may include n (n is one or more) image sensors corresponding to the first side and m (m is one or more) image sensors corresponding to the second side. At this time, the n image sensors and the m image sensors each include a plurality of pixels, and the light is received only in the block to which the light receiving control signal is applied to the plurality of pixels, and the light reception is blocked to the remaining blocks.

According to another aspect of the present invention, there is provided a method of driving an optical touch input device including sequentially lighting a plurality of infrared light emitting elements disposed at adjacent first and second sides of a display panel, And receiving the light reflected through the lens portions disposed at the third side and the fourth side of the panel through a sensor portion including a plurality of pixels corresponding to the first and second sides .

The sequential driving of the plurality of infrared light emitting elements is performed by applying a lighting control signal so that the plurality of infrared light emitting elements provided are sequentially turned on.

Alternatively, the sequential driving of the plurality of IR light emitting devices is performed by alternately turning on the odd-numbered light emitting devices and the even-numbered light emitting devices among the plurality of infrared light emitting devices to sequentially turn on the light emitting control devices.

Alternatively, the sequential driving of the plurality of infrared light emitting elements may be performed by sequentially turning on one of a plurality of infrared light emitting elements provided on the first side and a plurality of infrared light emitting elements provided on the second side, And applying a control signal.

The light receiving step of the sensor unit is performed by dividing the pixels of the sensor unit into a plurality of blocks for each arrangement interval of the infrared light emitting devices and applying a light receiving control signal to sequentially receive light on a block by block basis. At this time, the light receiving control signal is applied so that only the corresponding blocks of the illuminated infrared light emitting elements are received.

Alternatively, the light receiving step of the sensor unit divides the pixels of the sensor unit into a plurality of blocks for each arrangement interval of the lenses provided in the lens unit, and applies a light receiving control signal to sequentially receive light on a block by block basis.

Wherein the sensor unit includes n image sensors (n is one or more) and m (m is one or more) image sensors corresponding to the second sides corresponding to the first sides of the sensor unit When the n image sensors and the m image sensors each include a plurality of pixels, the plurality of pixels are divided into blocks and sequentially receive the blocks. When the light is sequentially received by the blocks, the remaining blocks block light reception.

The optical touch input device and the driving method thereof according to the present invention have the following effects.

The light emission source and the sensor unit are sequentially driven to prevent light interference that occurs when the light emitted from the adjacent light emitting units is incident on the lens from the light emitting source due to the limitation of the lens and then reflected and collected in the sensor unit. That is, when the sequential driving of the light emitting devices and the driving of the control signal for each block of the sensor block eliminate the phenomenon of overlapping of the light reflected through the lens, and the light spreads out from one lens to reach a pixel of a desired sensor portion The sensor of that part is cut off so that only the desired light reception data can be collected.

As a result, it is possible to solve problems such as recognizing a one-point touch as a two-point touch or recognizing a two-point touch as a one-point.

In addition, there is an advantage that an object having a small size is not affected by the surrounding lens and can be recognized as a touch.

1A is a view showing the distribution of reflected light and the reflection path when the light emitting source and the actual lens face each other;
FIG. 1B is a plan view showing a phenomenon of optical interference occurring in pixels corresponding to adjacent lens units when the light source of FIG.
FIG. 2 is a graph showing the light-receiving information actually sensed when only the first light emitting element among the light emitting elements positioned on the X axis is turned on and the remaining light emitting elements are turned off,
3 is a plan view showing an example of the optical touch input device of the present invention
FIG. 4 is a cross-sectional view of the first light emitting device of FIG. 3 and the lens portion opposed thereto,
Figure 5 is a view of the pixels of the image sensor of Figure 3;
6A to 6D are diagrams showing a driving method of the optical touch input device of FIG. 3
7 is a block diagram illustrating a touch controller used in applying the driving method of the optical touch input device of the present invention
8 is a plan view showing another embodiment of the optical touch input device of the present invention
9 is a view showing the image sensor of Fig. 8
FIG. 10 is a timing chart used in applying the driving method of the optical touch input device of FIGS. 8 and 9
11A and 11B are diagrams showing the degree of sensing during simultaneous driving and sequential driving in the arrangement of the same sensor unit and light emitting elements
Figs. 12A and 12B are diagrams illustrating a case where drawing is performed by the entire driving method when the one-point sizes of the touch pen are 4.25 mm and 3.34 mm, respectively
13A and 13B are diagrams illustrating a case where drawing is performed by the sequential driving method of the present invention when the one-point size of the touch pen is 4.25 mm and 3.34 mm, respectively

Hereinafter, an optical touch input device and a driving method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a plan view showing an example of the optical touch input device of the present invention, and FIG. 4 is a vertical cross-sectional view of the first light emitting device of FIG. 3 and a lens portion opposed thereto.

3 and 4, the optical touch input device of the present invention mainly includes a light emitting portion (refer to 110 in FIG. 7) including a plurality of light emitting elements 110a to 110h, A sensor unit 2000 for sensing the amount of light received and a lens unit 155 for reflecting the light emitted from the light emitting unit to the sensor unit 2000.

Here, the light emitting unit 110 and the sensor unit 2000 are formed to correspond to the first and second sides of the display panel 70, which are adjacent to each other, and the lens unit 155 is connected to the third and fourth sides Respectively. The light emitting unit 110, the sensor unit 2000, and the lens unit 155 emit infrared light, receive and reflect infrared light, and may include infrared filters.

The sensor unit 2000 includes a plurality of image sensors 120a, 120b, 120c, and 120d, and each of the image sensors 120a, 120b, 120c, and 120d includes a plurality of pixels, The pixels are connected to an infra-lens 223 via an optical fiber 222, respectively. The image sensors 120a, 120b, 120c and 120d, the optical fiber 222 and the infra-red lens 223 are included in the optical waveguide 121.

Here, the light emitting unit 110 and the sensor unit 2000 are disposed on both sides so as to emit light and receive light in the X-axis and Y-axis directions, respectively. The number of the light emitting devices and the sensor units may be different. When the number of image sensors included in the light emitting device and the sensor unit is different, a plurality of blocks in the image sensor may be provided, and the light emitting device and the block may be driven in correspondence with each other. That is, when one light emitting element is turned on, the light receiving information is acquired from the pixels of the selected block in the sensor section. In this case, the pixels of the remaining blocks block light reception.

 When a plurality of image sensors and light emitting units in the sensor unit are configured, sequential driving (light emission / light reception) signals are independently applied to the X axis and the Y axis, or light emission / light reception of the X axis or Y axis is completed, / Signal can be applied in such a way that light is received.

If the sequential driving signals are independently applied to the X and Y axes, one image sensor provided in the X and Y axes and one image sensor provided in the Y axis may be sequentially received. This also applies to the light emitting elements. That is, one light emitting element having one of the X-axis and the Y-axis and the other one of the light emitting elements having the Y-axis can be sequentially applied.

In the drawing, two image sensors 120a and 120b (120c and 120d) are arranged corresponding to the first and second sides of the display panel 70, and four light emitting devices 110a, 110b, 110c, and 110d (110e, 110f, 110g, and 110h) are disposed. Here, the image sensors 120a, 120b (120c, 120d) are divided into two blocks and a light receiving control signal is applied thereto.

The sensor unit may include n (n is one or more) image sensors corresponding to the first side (a side corresponding to the X axis), and m (m is a positive integer) corresponding to the second side (m is one or more) image sensors. At this time, the n image sensors and the m image sensors each include a plurality of pixels, and the light is received only in the block to which the light receiving control signal is applied to the plurality of pixels, and the light reception is blocked to the remaining blocks.

This makes it possible to prevent the light reflected by the light emitted from the other light emitting elements from affecting the pixels of the block in which the sensing is performed. That is, since the sensing is performed only on the pixels in the block of the image sensor corresponding to the light emitting device that has been lit, the remaining light emitting devices are kept turned off, and the optical interference due to the light emitted from the remaining light emitting devices is detected Which can be avoided.

The sensor unit 2000, the light emitting unit 110 and the lens unit 155 are provided for optical touch input and are located outside the active area A / A of the display panel 70. These may be placed in contact with the surface of the display panel 70 directly on the outside of the active area A / A of the display panel 70, and as occasion demands, a separate glass substrate may be further interposed , And may be placed on top of it.

The infra-red lens 223 collects the light reflected from the opposite lens units 155 in a one-to-one correspondence with a plurality of pixels included in the image sensor 221, To the pixels of the image sensors 110a, 110b, 110c, and 110d. The pixels of the image sensors formed on at least one axis are sequentially received on a block-by-block basis. That is, it is sequentially driven for a plurality of divided blocks of image sensors on one axis. In this case, the sequential driving may sequentially receive light on a block-by-block basis or drive even-numbered or odd-numbered light-emitting devices / blocks.

4, the display panel 70 includes an upper substrate 60 and a lower substrate 65, and an upper substrate 60 of the display panel 70 may emit light emitted from the infrared light emitting device 110 Is used as a horizontal moving path.

For example, the display panel 70 may be one of various flat panel display panels such as a liquid crystal panel, an organic light emitting display panel, an electrophoretic panel, and a quantum dot display panel. The medium of the upper substrate, which is used as a path through which the infrared light moves horizontally, is preferably glass.

When the display panel 70 is not a light emitting panel like a liquid crystal panel, it may include a backlight unit 50 or the like. The backlight unit 50 may include a light source, an optical sheet, a support main, and a cover bottom for housing a lower portion thereof.

The sensor unit 120 is located on the infrared light emitting device 110 and the lens unit 155 is bent in a direction from the lower portion of the display panel 70 through the upper substrate 60, So that it can be received by each infra lens 223 of the sensor unit 120. [ In this case, the movement of the infrared light transmitted through the lens section 155 is smoothly moved to the surface of the display panel 70.

A case 55 including a case top to cover the sensor unit 120 and the lens unit 155 and to cover the mold structure such as the backlight unit 50 is further provided.

In the optical touch input device, the display panel 70 functions as a touch surface and a display surface.

FIG. 5 is a diagram showing pixels of the image sensor of FIG. 3. FIG.

As shown in FIG. 5, one image sensor 120a of FIG. 3 includes a plurality of pixels and is received by the divided blocks A and B. FIG. In this case, if the A block is received, the collection of the light reception information is blocked in the B block, and the reception of the light reception information of the A block is blocked if the B block is received. For example, the divided blocks include the same number of pixels (n), and each of the pixels collects light reception information through the infra-red lens 223 and the optical fiber 222 provided in the sensor unit 2000 .

The image sensors 120c and 120d corresponding to the Y axis also have the same configuration as that of FIG. 5, and also have blocks and pixel structures similar to or similar to those of FIG. 5 .

6A to 6D are views showing a driving method of the optical touch input device of FIG.

For example, acquisition of light-receiving information on the X-axis will be described.

6A to 6D schematically show that the light emitting elements and the image sensors are arranged in correspondence with the same side, and on the actual arrangement, the light emitting element and the image sensor correspond to the same side of the display panel, (See Fig. 4). In this case, the light emitting device and the image sensor can be integrated on the same boards 190a and 190b, and are connected to the touch controller through the internal wiring of the boards 190a and 190b.

As shown in FIG. 6A, when the first light emitting device 110a is turned on, light receiving information is acquired from the A block A of the first image sensor 120a corresponding thereto. At this time, the remaining blocks (B) and the second image sensor 120b of the first image sensor 120a block information collection.

Then, when the second light emitting device 110b is turned on, light reception information is acquired from the B block B of the first image sensor 120a corresponding thereto. Similarly, the remaining blocks (A) and the second image sensor 120b of the first image sensor 120a block information collection.

Here, the light receiving information acquisition in the A and B blocks is performed through the same first image sensor 120a, and selective light receiving information acquisition of these blocks is performed by receiving light receiving control signals.

Then, as shown in FIG. 6C, when the third light emitting device 110c is turned on, the light receiving information is acquired from the C block C of the second image sensor 120b corresponding thereto. At this time, the first image sensor 120a and the remaining blocks D of the second image sensor 120b block information collection.

Then, when the fourth light emitting device 110d is turned on, the light receiving information is obtained from the B block D of the second image sensor 120b corresponding thereto. Similarly, the remaining blocks C of the second image sensor 120b and the first image sensor 120a block information collection.

Here, the light receiving information acquisition in the C and D blocks is performed through the same second image sensor 120b, and selective light receiving information acquisition of these blocks is performed by receiving light receiving control signals.

In such an optical touch input device, a touch controller capable of sensing a touch has the following configuration.

7 is a block diagram showing a touch controller used in applying the driving method of the optical touch input device of the present invention.

7, the touch controller 300 of the present invention includes a sequential signal generator 330 for applying a lighting control signal and a light reception control signal to the light emitting unit 110 and the sensor unit 2000, A light receiving information collecting unit 320 for collecting the light receiving information from the light receiving information collecting unit 2000, and a coordinate calculating unit 310 for calculating touch coordinates based on the information collected by the light receiving information collecting unit.

Here, the touch coordinates calculated by the coordinate operation unit 310 are connected to an external system (not shown) to generate a touch event.

Here, the generation of the turn-on control signal is sequentially applied to the light-emitting elements provided in the light-emitting unit, and the turn-on / off control signals are sequentially alternately driven to the odd-numbered light- Or the plurality of infrared light emitting elements provided on the second side may be a pair of the infrared light emitting elements provided on the first side and the infrared light emitting elements provided on the second side, To be sequentially turned on.

The generation of the light-up control signal causes the entire light-emitting elements to be sequentially applied within one frame.

In addition, the sensor unit 2000 includes one or more blocks 233, and n pixels are included in each block as shown in FIG. 5, so that n pixels are received at one time. In the case where the sensor unit 2000 includes only one block, the sensor unit 2000 includes only one image sensor, and receives the pixels in the image sensor at the same time with the image sensor as one block.

If the sensor unit 2000 includes a plurality of blocks, the touch controller 300 divides the pixels of the sensor unit 2000 into a plurality of blocks 233 for each placement interval of the infrared light emitting devices A light receiving control signal is applied to the sensor unit 2000 so as to sequentially receive light for each block 233. At this time, the application of the light receiving control signal causes only the corresponding blocks of the illuminated infrared light emitting elements to be received.

This makes it possible to prevent the light reflected by the light emitted from the other light emitting elements from affecting the pixels of the block in which the sensing is performed. That is, since the sensing is performed only on the light-emitting element that has been turned on, the remaining light-emitting elements can be kept turned off to prevent optical interference due to light emitted from the remaining light-emitting elements.

In some cases, the touch controller 300 divides the pixels of the sensor unit 2000 into a plurality of blocks for each arrangement interval of the lenses provided in the lens unit (see 155 in FIG. 3) A light receiving control signal may be applied.

Likewise, the generation of the light reception control signal causes successive application of the entire image sensors (or blocks therein) to be performed within one frame.

FIG. 8 is a plan view showing another embodiment of the optical touch input device of the present invention, and FIG. 9 is a view showing the image sensor of FIG.

As shown in FIG. 8, another embodiment of the optical touch input device of the present invention includes only one image sensor in the sensor unit 120, and sequentially receives the image sensor divided into a plurality of blocks.

In this case, a plurality of light emitting portions 110 are provided corresponding to the first side and the second side of the display panel 70, respectively, and the lens portion 155 is provided on the third, And is provided corresponding to the fourth side.

In this case, the structure of the sensor unit 120 is the same as the structure of FIG. 3 except for the order in which the image sensor 221 is provided, and a description of the same structure will be omitted.

As shown in FIG. 9, the image sensor 221 in the sensor unit 120 includes a plurality of pixels. The pixels correspond to the E to I blocks, and n pixels are provided corresponding to the X-axis (first side) Pixels are arranged in the E, F, and G blocks, and pixels corresponding to the Y axis (second side) are arranged in the H, I blocks.

As shown in the figure, the blocks may be arranged in two rows or may be arranged in a line in the form of a kind of line sensor array. Unlike the case of the former, the pixels included in each block may be arranged differently, or the same blocks may be arranged in different columns.

Here, each block simultaneously receives light to pixels provided according to a control signal, and when one block receives light, the other block blocks light reception.

10 is a timing chart used in applying the driving method of the optical touch input device of FIGS. 8 and 9. FIG.

As shown in Fig. 10, in the optical touch input device of Figs. 8 and 9, the light emitting elements (IR LED 1st, IR LED 2nd, ... IR LED nth) provided are sequentially turned on. In the image sensor, control signals (Control 1, 2,..., And so on) are sequentially supplied to the plurality of blocks in synchronization with lighting of the light emitting elements in synchronization with the shutter signal of the image sensor (Image Sensor Shutter). ..., Control n) are applied. Here, the blocks in the image sensor are turned on during the lighting time (s2) of the light emitting element or a time slightly longer than the lighting time of the light emitting element. This is different from the conventional image sensor in that the light receiving information collection is divided by comparing the light receiving information and the point (s1) collected during the lighting time of all the light emitting elements with respect to all the pixels.

This makes it possible to prevent the light reflected by the light emitted from the other light emitting elements from affecting the pixels of the block in which the sensing is performed. That is, since the sensing is performed only on the light-emitting element that has been turned on, the remaining light-emitting elements can be kept turned off to prevent optical interference due to light emitted from the remaining light-emitting elements.

Hereinafter, differences in the touch sensing accuracy between the optical touch input device to which the sequential driving method of the present invention is applied and the optical touch input device to which the entire driving method is applied will be described.

FIGS. 11A and 11B are views showing the degree of sensing during simultaneous driving and sequential driving in the arrangement of the same sensor unit and light emitting elements.

11A shows a state in which when the light emitting elements 11a, 11b, 11c, and 11d are lighted simultaneously, even if the pen touches the portion corresponding to the third light emitting element and is directly hidden at the position of the pen, The sensor unit 20a senses that the light is received by the light emitted from the light emitting unit 30a.

11B shows a case where a touch is made in correspondence with the third light emitting element 110c in the driving method of the optical touch input apparatus of the present invention in which the light emitting elements are successively lit. In this case, the third light emitting element 110c, The touch of the pen is sensed. The other light emitting devices are kept in the off state when the third light emitting device 110c is lit and thus the second image sensor 120b reflects only the opposite second image sensor 120b in the lens unit 155, The light reception information is collected within the finite pixels so that there is no optical interference caused by other light emitting elements. In addition, the second image sensor 120b may be divided into two or more blocks so that light can be received. In this case, only the block corresponding to the third light emitting device can be selectively received .

12A and 12B are diagrams showing touch pen drawing by applying the entire driving method when the one point size of the touch pen is 4.25 mm and 3.34 mm, respectively.

As shown in FIGS. 12A and 12B, in the entire driving method, when the actual touch pen draws a drawing similar to a sinusoidal wave without interruption, the drawing line sensed on the actual display panel is interrupted midway . Further, as the diameter becomes smaller, such a breaking phenomenon becomes worse.

FIGS. 13A and 13B are drawings illustrating a case where the touch pen is drawn by the sequential driving method of the present invention when the one point size is 4.25 mm and 3.34 mm, respectively.

As shown in Figs. 13A and 13B, when drawing the same sinusoidal wave as in Figs. 12A and 12B, it can be seen that the touch sensing is performed seamlessly even in sequential drive application.

It can be seen that the performance in small object recognition is improved in the sequential driving method.

Also, it can be confirmed in the example of FIGS. 11A and 11B that optical interference is prevented. That is, it is possible to sense an object having a small size without being influenced by the lens of the peripheral lens unit that performs sensing.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

110:
110a, 110b, 110c, 110d, 110e, 110f, 110g, 110h:
120a, 120b, 120c, and 120c:
121: optical waveguide 222: optical fiber
223: Infrared lens 300: Touch controller
310 coordinate calculation unit 320 light reception information collecting unit
330: Sequential signal generator

Claims (18)

A plurality of infrared light emitting elements arranged at adjacent first and second sides of the display panel;
A lens portion disposed at a third side and a fourth side of the display panel;
A touch controller for applying a lighting control signal for sequentially lighting the plurality of infrared light emitting elements; And
An optical waveguide including a plurality of image sensors, a plurality of image sensors, an optical fiber, and an infra lens, each of which includes a plurality of pixels connected to an infra-red lens via an optical fiber, And a sensor unit corresponding to the first side and the second side for receiving light reflected from the lens unit on a pixel by pixel basis,
Each of the plurality of image sensors is divided into two blocks so that only the corresponding block of the image sensor corresponding to the infrared light emitting device that emits light among the two blocks is turned on and the remaining blocks are kept turned off Optical touch input device. The method according to claim 1,
Wherein the lighting control signal is alternately and sequentially driven by an odd number light emitting element and an even number light emitting element. The method according to claim 1,
Wherein the lighting control signal is applied to sequentially drive the plurality of infrared light emitting elements provided. The method according to claim 1,
Wherein the turn-on control signal is applied such that one of a plurality of infrared light-emitting elements provided on the first side and a plurality of infrared light-emitting elements provided on the second side are sequentially turned on and turned on in pairs, . The method according to claim 1,
Wherein the touch controller applies a light receiving control signal to the sensor unit so that the pixels of the sensor unit are divided into a plurality of blocks for each arrangement interval of the infrared light emitting devices and sequentially received by blocks. delete The method according to claim 1,
Wherein the touch controller applies a light receiving control signal so that the pixels of the sensor unit are divided into a plurality of blocks for each arrangement interval of the lenses provided in the lens unit and sequentially received on a block-by-block basis. delete delete A step of sequentially lighting a plurality of infrared light emitting elements arranged on adjacent first and second sides of the display panel; And
A plurality of image sensors each including a plurality of pixels connected to an infra-red lens via an optical fiber, a plurality of image sensors, and an optical waveguide having an optical fiber and an infra-red lens, And a light receiving step of receiving light reflected through the lens sections arranged at the third side and the fourth side of the display panel,
In the light receiving step, each of the plurality of image sensors is divided into two blocks, so that only the corresponding block of the image sensor corresponding to the infrared light emitting device that emits light among the two blocks is turned on, and the remaining blocks are kept turned off Wherein the touch input device is a touch input device. 11. The method of claim 10,
Wherein the sequential driving of the plurality of infrared light emitting elements is performed by applying a lighting control signal so that the plurality of infrared light emitting elements provided are sequentially turned on. 11. The method of claim 10,
Wherein the sequential driving of the plurality of infrared light emitting elements is performed by sequentially applying an illumination control signal to the odd numbered light emitting elements and the even numbered light emitting elements among the plurality of infrared light emitting elements, . 11. The method of claim 10,
Wherein the sequential driving of the plurality of infrared light emitting elements is performed by sequentially lighting one of a plurality of infrared light emitting elements provided on the first side and a plurality of infrared light emitting elements provided on the second side, And a signal is applied to the optical touch input device. 11. The method of claim 10,
Wherein the light receiving step of the sensor unit is performed by applying a light receiving control signal so that the pixels of the sensor unit are divided into a plurality of blocks for each arrangement interval of the infrared light emitting devices and sequentially received by blocks. . delete 11. The method of claim 10,
Wherein the light receiving step of the sensor unit is performed by applying a light receiving control signal so that the pixels of the sensor unit are divided into a plurality of blocks for each arrangement interval of the lenses provided in the lens unit and sequentially received on a block by block basis. . delete delete

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