KR20240038907A - Object Location Detection Device - Google Patents

Abstract

The present invention relates to a method of configuring a sensor pattern so that a touch signal based on a change in the effective area is linearly detected when a pen touches the ODA that constitutes the object detection device of the present invention installed on the upper surface of a conductor. It also relates to a method of configuring a sensor pattern that minimizes moiré caused by interference with a display device. This has the effect of improving the readability of pen letters and improving visibility by avoiding moiré.

Description

Object Location Detection Device

The present invention relates to a touch panel that detects capacitive touch input by an object such as a body finger or a pen, and more specifically, a touch panel for effectively determining the location of an object when a touch occurs by the object. It is about the structure of the sensor.

In the past, mechanical buttons were used to press phone numbers on mobile phones, but recently, input devices are changing from mechanical to electronic, with phone numbers being entered just by lightly touching the display of the mobile phone with a finger. As an example of an electronic input device, a capacitive type touch input device is mainly used. A capacitive touch input device is a change in capacitance that occurs when an object such as a finger or pen touches or touches the touch sensor, which is an object detection area installed on the top of the display device. , it is determined that the input at that location is valid as if a mechanical button was pressed.

Recently, as tablets have become widely used, the use of touch pens as an input device has been greatly expanded. Since the tip of a touch pen is generally composed of a diameter of about 1 to 2 mm, the touch sensor must also be formed to be narrow in order to recognize a touch pen with a width narrower than that of a finger.

1 shows an object detection device according to an embodiment of the present invention. The basic components of the object detection device are the Object Detection Area (ODA) and the Touch IC (300). In Figure 1, the object detection area consists of 8 rows and 10 columns. The embodiment of Figure 1 is only an example considering the convenience of drawing, and in reality, the object detection device of the present invention may be displayed in various numbers of rows and columns depending on the size or purpose of use of the attached display device.

Touch IC 300 refers to a device that detects touch and touch point based on the touch signal in the form of voltage collected through the ODA signal line 200, and is a semiconductor IC that controls all processes for detecting touch in ODA. am. The Touch IC (300) includes various circuits such as ADC, DAC, multiplexer, power supply, memory, and differential amplifier. Additionally, a logic unit or CPU that controls the touch process may be included.

In Column 1, 8 ODAs are located, including Row8 ODA located near the Touch IC (300) and Row1 ODA located at a long distance. Arbitrary ODA is divided into sensing ODA and driving ODA depending on the operation method.

When a touch by an object occurs in the sensing ODA, the sensing ODA signal line connected to the sensing ODA is connected to the sensing unit inside the Touch IC (300) in order to detect the change in voltage generated in the sensing ODA. Additionally, the driving ODA signal line connected to the driving ODA is connected to the driving unit inside the Touch IC (300) and a driving voltage of a predetermined size is applied.

The ODA of the ODA column is sequentially divided into one sensing ODA and one or more driving ODA. In Figure 1, there are 10 ODA columns, so there are 10 sensing ODAs. The driving ODA is an ODA adjacent to the sensing ODA to which the driving voltage is applied. In one embodiment, when Row4 ODA is selected as the sensing ODA in any ODA column, a plurality of driving ODAs may be selected up and down, such as Row3/Row2 and Row5/Row6 ODA neighboring Row4 ODA in the same ODA column. One driving ODA can be selected up and down, such as Row3 and Row5.

The Touch IC (300) sequentially selects the sensing ODA and the driving ODA in the ODA column using the time division method and performs processing related to touch sensing.

One sensing ODA is selected from one ODA column, and for effective processing, it is desirable that the sensing ODA selected from each ODA column be located in the same row. As an example, in Figure 1, after 10 ODAs belonging to Row1 are selected as sensing ODAs and processing is completed, 10 ODAs belonging to Row2 are selected as sensing ODAs, and ODAs belonging to Row8 are sequentially selected from Row3 ODA to the last ODA. It is selected as a sensing ODA and processing is performed. If the ODA belonging to Row1 is selected as the sensing ODA, Row1 and its neighboring Row2 (or Row3 as well) operate as the driving ODA, and if Row2 ODA is selected as the sensing ODA, Row1 and Row3 (or Row4 as well) operate as the driving ODA. is selected. In the same way, when 10 ODAs belonging to Row3 are selected as sensing ODAs, Row3 ODA and neighboring Row2 ODAs (or Row1 ODAs are also included) and Row4 ODAs (or Row5 ODAs are also included) are selected as driving ODAs and have a predetermined size. AC alternating voltage is applied to the branches.

When an alternating voltage is applied to the driving ODA, in circuit terms, it is the same as applying the driving voltage to the mutual capacitance formed between the sensing ODA and the driving ODA, so the parasitic capacitance formed in the sensing ODA and the sensing ODA signal line (for example, A charge sharing phenomenon occurs between the mutual capacitance (such as the common electrode capacitance and the parasitic capacitance formed adjacent to the sensing ODA inside the Touch IC), and a voltage based on charge sharing is detected in the sensing ODA signal line, and the Touch IC detects the sensing ODA. Whether or not there is a touch is determined based on the level of voltage detected at the ODA signal line.

In Figure 1, one ODA column consists of eight ODAs, and the ODA signal line 200 connected to the ODA forms a signal line harness (SLH), which is a bundle of signal lines. Since the number of ODA signal lines increases as you move from the far row to the near row, the width of the SLH widens as you go from the far row to the near row. Since the embodiment of Figure 1 consists of 10 ODA columns, 10 SLHs are formed.

In this specification, Column 1 to Column 10 consisting of a plurality of ODA are defined as “ODA columns.” In the case of the embodiment of Figure 1, the ODA signal line 200 bound to the ODA column is illustrated as being located in a single path on the right side of the ODA column, but it may also be disposed in both directions, such as to the left and right of the ODA column. That is, an embodiment is possible in which the signal line 200 of the odd ODA is placed on the left side of the ODA column, and the signal line 200 of the even ODA is placed on the right side of the ODA column.

Meanwhile, the direction perpendicular to the ODA column is defined as a row. In addition, based on the Touch IC (300), one side of the ODA arranged in the far and near directions, i.e. up and down, is defined as the long side, and the side in the direction perpendicular to the long side is defined as the short side. do. In the embodiment of Figure 1, the length of the long side of all ODAs is the same. However, as the SLH gradually becomes thicker in the downward direction, the length of the short side of the ODA gradually decreases as the ODA moves downward.

In an embodiment of the present invention related to the object detection device of Figure 1, in order to precisely determine the touch coordinates of the pen tip, which has a small touch area compared to the finger, the shorter the length of the long side and the short side of the ODA, that is, the area of the ODA. The smaller the better. This means that multiple ODAs must be installed in the object detection device of the present invention. When multiple ODAs are installed, the number of ODAs increases in the ODA column, which increases the width of the SLH, so there is a limit to increasing the quantity of ODAs. As the number of ODAs increases, the Touch IC (300) to which the ODA signal line (200) is input increases. There is a problem that commercialization is difficult because the area is expanded and the cost increases.

One of the ways to improve the position detection resolution of the pen without increasing the ODA is to minimize the length of the short side of the ODA, but to form a diamond shape between any ODA and the ODA adjacent to it above and below in the same ODA column. By intersecting each other, the touch position of the pen is identified based on the area difference due to the movement of the pen in the intersection area.

Quoting paragraph number [0106] of Korean Patent No. 10-1740269 (Application No. 10-2015-0095457, hereinafter referred to as Cited Patent 1), which the present applicant previously applied for and registered, is as follows.

"As shown in FIG. 2A, each column of the touch panel has a shape in which the first pattern of 200-1 and the first pattern of 200-2 are interlocked up and down with the phases reversed by 180 degrees. “ It is formed through repeated arrangement .”

Additionally, paragraph numbers [0118] to [0119] of the same patent are as follows.

"Also, in Figure 2(b), each first pattern is shown as being formed by connecting 2.5 second patterns, but the second patterns constituting the first pattern are 3, 3.5, 4, or 4.5, etc. It is variable depending on the resolution.

As mentioned above, the shape of the second pattern constituting the first pattern, which is the basic pattern, is a diamond shape ."

Referring to Figure 2 of Cited Invention 1, the first pattern of Cited Invention 1 is composed of a plurality of second patterns in which diamond shapes are repeatedly arranged, and the shapes that are interlocked up and down are repeated with the phases reversed by 180 degrees. It is formed by being placed. The advantage of this arrangement method is, as described in paragraph number [0122] of Cited Invention 1, " In the case where the present invention is configured in a rhombus or diamond shape, the advantage is that as shown in the circle 250, 200- “The touch position can be detected more easily by the area difference between the 1 pattern and the 200-2 pattern.” That is, assuming that the circle 250 in Figure 2 is a touch pen, when the touch pen moves, the difference in area occupancy between the upper pattern 200-1 and the lower pattern 200-2 by the touch pen causes the upper and lower sides of the touch pen. This means that it is possible to determine the location.

Meanwhile, referring to paragraph numbers [0225] to [228] of Cited Invention 1, it is as follows.

[0225 ] The second pattern shown in FIG. 2 has an overall diamond shape, but this diamond shape is formed by connecting gradually widening squares and gradually narrowing squares.

[ 0226] The second pattern of 240-5 in FIG. 12 is formed by arranging rectangles such as the first area 1220, the second area 1230, and the third area 1240 with increasing width .

[0227 ] In the increase areas where the width of the rectangle is widened, two opposing vertices of a diamond shape will be arranged up to the maximum width point, and from the point of the maximum width, a plurality of decrease areas where the width of the rectangle will be narrowed will be repeatedly arranged.

[0228] The second pattern of 240-2 in FIG. 12 shows that the width of the square gradually becomes narrower toward the first area 1250, the second area 1260, and the third area 1270 .

Referring to the description of paragraph numbers [0225] to [228] of Cited Invention 1, the diamond-shaped second pattern is a polygon formed by joining squares with different areas. In Figure 12 of Cited Invention 1, first regions (1220, 1250), second regions (1230, 1260), and third regions formed by continuous connection of squares with increasing or decreasing area (in particular, only the length of the short side increases or decreases). In one of the areas (1240, 1270), the areas of the two facing squares are the same, so no difference in area occurs due to a change in the position of the pen, so it is impossible to detect a change in position due to a pen touch.

As a result, the change in touch area due to the movement of the pen does not occur linearly, but occurs block by block in response to changes in the size of the square, which reduces linearity. Therefore, when writing with a pen, the letters are not formed well or the shape is unrecognizable. There is a problem with writing with reduced linearity, such as being unable to read.

Korean registered patent: No. 10-1760061 (hereinafter: Cited Patent 1)

The present invention was proposed to solve the problems of the prior art as described above, and its object is to provide an object position detection device in which a change in the effective touch area occurs linearly in response to a change in the position of the pen.

In addition, the goal is to provide a touch sensor structure that is correlated with the diameter of the pen tip to prevent touch detection errors.

In addition, the aim is to provide a visually improved object detection device by avoiding the moiré phenomenon caused by optical coupling between the display device and the ODA.

In order to achieve the above object, an embodiment of the present invention includes a Touch IC that controls a touch process; An ODA column consisting of a plurality of first shape object detection areas (ODA) stacked up and down based on the Touch IC; a plurality of ODA signal lines connected one to each of the first shape ODA; A signal line harness (SLH), which is a bundle of the plurality of ODA signal lines; A third shape ODA stacked vertically for electrical insulation between signal lines in the SLH; And a dummy third shape ODA, which is separated and stacked upwards and downwards, is added between the third shape ODAs connected and stacked upwards and downwards.

Additionally, the third shape ODA and the dummy third shape ODA have the same shape.

In addition, the area of the third shape ODA stacked vertically connected is the same.

In addition, the area of the dummy third shape ODA, which is stacked separately at the top and bottom, is the same.

In addition, the area of the third shape ODA stacked vertically connected is the same as the area of the neighboring third shape ODA.

In addition, the vertical outlines of the third shape ODA and the dummy third shape ODA are composed of diagonal lines having a predetermined angle with respect to the vertical line, and the left and right outlines are also composed of diagonal lines having a predetermined angle with respect to the horizontal line.

Additionally, the third shape ODA and the dummy third shape ODA are angle bracket shapes.

According to one embodiment of the present invention, the same minute area change occurs in the ODA in response to a minute position movement of the pen, so the object position detection resolution is improved and linearity is improved.

Additionally, since it is possible to detect the pen's touch position with high resolution without increasing the number of ODAs, it has the effect of reducing costs by reducing the area of the Touch IC.

In addition, poor visibility caused by the moiré phenomenon is improved, thereby improving marketability.

In addition, by configuring the area of the second shape ODA to have a correlation with the diameter of the pen tip, there is an effect of preventing detection errors in which abnormal coordinates are detected.

The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

Figure 1 is an embodiment of the present invention regarding an object detection device.
Figure 2 is an embodiment of the present invention regarding cross-placement of ODA.
Figure 3 is a detailed view of View "A" in Figure 2b.
Figure 4 is an embodiment of the present invention regarding the change in area according to the position of the third shape ODA, which constitutes the half wings of the Row4 ODA and the row3 and row5 ODAs adjacent to each other above and below.
Figure 5 is an embodiment of the present invention in which the second shape ODA is composed of an isosceles triangle.
Figure 6 is an embodiment of the present invention regarding a method for reducing and enlarging the area of a third shape ODA.
Figure 7 is an embodiment of the present invention for determining the position of the center line and the angle of the diagonal line when a left-projecting or right-projecting bracket is used as a third shape ODA.
Figure 8 is an embodiment of the present invention in which a third shape ODA is formed by a combination of a left protruding bracket and a right protruding bracket.
Figure 9 is an embodiment of the present invention regarding the shape of a pen tip used in the object detection device of the present invention.
Figure 10 is an embodiment of the present invention showing the correlation between the configuration of the second shape ODA and the pen tip touch area.
Figure 11 is a display device with a resolution of 4*6.
Figure 12 is an embodiment of the present invention regarding the external appearance of a third shape ODA for avoiding moiré.
Figure 13 is an embodiment of the present invention regarding a third shape ODA implementation mode used in SLH, which is a bundle of ODA signal lines.
Figure 14 is an embodiment of the present invention in which a third shape ODA is composed of a combination of a left protruding bracket and a right protruding bracket.
Figure 15 is an embodiment of the present invention in which the short side of the bracket is composed of a single diagonal line.
Figure 16 is an embodiment of the present invention in which the "Z" Type is used as the third shape ODA.
Figure 17 is an embodiment of the present invention in which "X" Type is used as the third shape ODA.

The terms used in the present invention are general terms that are currently widely used as much as possible while considering the functions in the present invention, but this may vary depending on the intention of a person skilled in the art, precedents, or the emergence of new technology. In addition, in certain cases, terms arbitrarily selected by the applicant were used, and in this case, the meaning will be described in detail in the description of the relevant invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than simply the name of the term.

In addition, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and the present invention is not necessarily limited to what is shown.

In order to clearly express various layers and areas in the drawing, the thickness and width are exaggerated through drawings such as relative enlargement and relative reduction. When a part of a layer, area, etc. is said to be “on” or “above” another part, this includes not only cases where it is “directly above” another part, but also cases where there is another part in between.

In addition, the distance and direction (far/near) are based on the Touch IC (300). Far distance means far away from the Touch IC (300), and near distance means close to the Touch IC (300).

Additionally, the vertical and horizontal directions of the object detection device of the present invention are based on the Touch IC (300). Since the ODA column of the present invention is positioned perpendicular to the Touch IC, it should be understood as being installed longitudinally.

Additionally, the Source Drive IC of the display device 10 was assumed to be located on the lower side of the display device, and the Gate Drive IC was assumed to be installed on the right side of the display device. The Gate Drive IC may be a separate semiconductor IC, but it may also be built into the display device using the TFF that makes up the display device.

When it is said that a part "includes" a certain element throughout the specification, this means that, unless specifically stated to the contrary, it does not exclude other elements but may further include other elements.

In addition, terms such as "... unit" and "module" used in the specification refer to a unit that processes at least one function or operation, which may be implemented as hardware or software, or as a combination of hardware and software. .

In addition, the ODA 100 and the ODA signal line 200 connected thereto are geometrically distinct, but electrically have the same meaning. Therefore, the meaning of “detecting voltage from the sensing ODA” is the same as “detecting the voltage from the signal line connected to the sensing ODA.”

In addition, in this specification, the sensing ODA signal line and the driving ODA signal line are collectively referred to as the ODA signal line, and when a clear meaning is needed, they are divided into the sensing ODA signal line or the driving ODA signal line.

Additionally, under the control of the Touch IC, the ODA sequentially becomes a sensing ODA, a driving ODA, or operates as an ODA that does not play any role. In this specification, “voltage detected in ODA” has the same meaning as “voltage detected when ODA operates as a sensing ODA.”

In addition, the capacitance detection device of the present invention is a "system" that detects the voltage on the sensing signal line after applying the driving voltage to the driving signal line adjacent to the sensing signal line and the potential of the sensing signal line is stabilized. The mathematical equation representing the voltage detected from the sensing signal line after applying the driving voltage to the driving signal line was expressed as the “transfer function” of the system.

Additionally, when the object detection device of the present invention is installed on the upper surface of a display device, the upper surface of the object detection device is covered with a protective material such as glass or plastic. Therefore, when writing on the object detection device with a pen or making a free movement for touching, it should be considered that the touch is made on the upper surface of the protective material.

Additionally, the Object Detect Area (ODA) is used in the same sense as the touch sensor that detects touch.

In addition, the long side of the third shape ODA is a vertical outline, and the short side is a left-right outline.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the embodiments of the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unrelated to the description are omitted, and similar reference numerals are used for similar parts throughout the specification.

Figure 2 is an embodiment of the present invention regarding cross-arrangement of ODA. Figures 2a and 2b show only Row3 ODA to Row6 ODA separated from any ODA column in Figure 1.

Figure 2c shows Row4 ODA, which consists of six squares (121, 122, 123, 125, 126, 127) and a connection portion (124). Each square is arranged facing upward and downward with respect to the second shape ODA connection portion 124. At this time, one of the six isosceles squares is called the second shape ODA, and the second shape ODA is composed of ITO, IZO, or metal mesh, which are transparent conductors. The second shape ODAs are electrically interconnected by the second shape ODA connection portion 124.

One ODA signal line 200 is connected to the plurality of second shape ODAs and the second shape ODA connector 124 in Figure 2, and is called a first shape ODA. Therefore, the first shape ODA is composed of one ODA signal line 200, a plurality of second shape ODA (121, 122, 123, 125, 126, 127), and a second shape ODA connection part 124.

Figure 2a shows the conceptual configuration of the first shape ODA, while Figure 2c expresses the actual appearance of the first shape ODA, and shows the size of the mutual capacitance formed between the two opposing ODAs in Figure 2c, or the touch with the pen. It is possible to predict area, etc.

Figure 2c is the first shape ODA belonging to Row 4 among the four ODAs in Figure 2a, the second shape ODA in the far direction and the second shape ODA in the near direction based on the center line (C.L.), and the near and far directions. It consists of a second shape connection portion 124 between second shape ODA. In this specification, for convenience, the second shape ODA in the far direction is called a first half wing, and the second shape ODA in the near direction is called a second half wing.

The first half wing and the second half wing are extended and arranged near the center line of the neighboring ODA, and are arranged at a predetermined distance from the second shape ODA connection portion 124 of the neighboring ODA. Therefore, in the second shape ODA connection unit 124, its half wings are expanded up and down, and the edges of the two half wings expanded from the two ODAs adjacent to the top and bottom are arranged with a predetermined space, so that three ODAs are formed. are located (only two ODAs are located in the top and bottom ODAs).

If the half-wing edge portion of the neighboring ODA arranged up and down adjacent to the second shape ODA connection part 124 exceeds the center line of the ODA of the second shape ODA connection part, the exceeded area is the second shape ODA connection part 124 ) is lost, causing a problem in which the electrical connection between the second shape ODAs constituting the first shape ODA (110) is broken, making stable touch detection impossible, so the edge of the half wing is connected to the second shape ODA connection part of the neighboring ODA. It must be placed at a certain distance from (124).

Additionally, the first half-wing and the second half-wing originating from an arbitrary ODA share an intersection area with a neighboring ODA. In other words, the first half-wing of Row4 ODA is arranged opposite to the second half-wing of Row3 ODA in the intersection area, and the second half-wing of Row4 ODA is arranged opposite to the first half-wing of Row5 in the intersection area. It is placed. The intersection area is the area between the center lines of two neighboring ODAs.

In the conceptual ODA layout diagram of FIG. 2A, the intersection area is formed between the center lines (C.L.) of two neighboring ODAs by contributing the same area to the two ODAs. If the donation ratio between two ODAs is different, a detection error occurs when the detection coordinates according to the touch area ratio are not constant, so the donation ratio must be the same for each ODA. The two opposing half-wings in the intersection area are arranged at a predetermined interval to avoid electrical shorting.

The total of all opposing lengths becomes longer as the number of second-shaped ODAs increases, and the size of the mutual capacitance formed between two ODAs is proportional to the total opposing lengths. Since the total opposing length of FIG. 10C is larger than that of FIG. 10A, which will be described later, the mutual capacitance of FIG. 10C is larger than that of FIG. 10A.

The size of the mutual capacitance formed between the two opposing ODAs in the intersection area is located in the denominator of the transfer function, as in the embodiments of Equations 2 and 3 described later. Referring to Equation 2 to Equation 3 described later, as the size of the mutual capacitance increases, the denominator of the transfer function becomes larger, which lowers the detection voltage, that is, there is a problem that touch sensitivity decreases. Therefore, in order to improve touch sensitivity, It is desirable to lower the size of the mutual capacitance. In order to reduce the size of mutual capacitance, the number of second-shaped ODAs must be reduced and the opposing spacing must be widened.

Meanwhile, according to the section discussing the coordinate detection error of the pen touch based on FIG. 10 described later, as the number of second shape ODAs increases, the coordinate detection error of the pen is improved. To improve the coordinate detection resolution of the pen, the number of second shape ODAs must be large, and to improve detection sensitivity, the number of second shape ODAs must be small, so the coordinate detection performance of the pen and the touch sensitivity of the pen are inversely proportional to each other. .

In order to improve the touch sensitivity of the pen, separate means may be provided, such as improving the precision of the ADC or improving the size of the driving voltage, so improving the coordinate detection function is prioritized over improving the detection sensitivity of the pen, so the second shape ODA The larger the number, the better. Meanwhile, as the number of second-shaped ODAs increases, the size of the mutual capacitance of the two opposing ODAs in the intersection area increases. Therefore, another way to reduce the size of the mutual capacitance is to increase the opposing gap between the two opposing ODAs. .

Referring to Figure 12 of Cited Invention 1, it can be seen that the pink second pattern and the yellow second pattern are separated by a single white bracket. As described later, the size of one bracket is determined in conjunction with the size of the sub pixel of the display device, but is similar to the size of the sub pixel. According to recent display device manufacturing capabilities, the size of a pixel of a display device does not exceed 300um(H) ) is smaller than that. The size of the brackets constituting the pink second pattern and the yellow second pattern in Drawing 12 of Cited Invention 1 is similar to the size of the sub pixel, so the pink second pattern and the yellow second pattern are separated by a gap of approximately 100um. can be inferred.

The two second patterns of Cited Invention 1, which narrowly face each other with an opposing gap of about one bracket spacing, are highly likely to short-circuit each other due to process defects such as foreign substances or poor exposure during the manufacturing process, and the opposing spacing is Compared to the case of two brackets or three brackets, the size of mutual capacitance also increases by about 30% or 60%. Therefore, the two ODAs facing each other in the intersection area of Figure 2 of the present invention have a plurality of intervals, such as double or triple, based on the pitch of the short side (or the pitch between longitudinal center lines) of the third shape ODA, which will be described later. It is desirable to have it.

Referring to Figure 2b, in the first half-wing and the second half-wing originating from one ODA, there are ODAs with the same area and ODAs with different areas due to the influence of the ODA signal line 200. In the case of Row4 ODA, since it is only affected by the upper Row3 ODA signal line, the area ratio of the first and second half wings of Row4 ODA is the same. On the other hand, Row5 ODA is influenced by two ODA signal lines, including the Row4 ODA signal line and the ODA signal line originating from its second shape ODA connection portion 124, so the area of the second half wing is reduced compared to the area of the first half wing. .

In this way, the ODA, from which the ODA signal line 200 originates from its second shape ODA connection portion 124, has a reduced area of the lower second half-wing compared to the upper first half-wing. When the touch area is significantly smaller than the area of the half-wing, such as with a pen, a touch coordinate detection error due to the area difference between the first half-wing and the second half-wing constituting the first shape ODA does not occur. However, a touch with a large area such as a finger can be located simultaneously on the first and second half wings that make up one first shape ODA, so it can be touched by the area difference between the first half wing and the second half wing. A touch coordinate detection error may occur.

Therefore, when the areas of the first and second half-wings constituting one first shape ODA are different from each other, it is desirable to compensate for the difference in area of the second half-wing, which has a smaller area than the first half-wing. . The compensation method is to calculate the area of the second half wing to be wider at a predetermined ratio by the area reduced by the ODA signal line 200, and this work can be performed using software built into the Touch IC 300. there is. At this time, the size of the compensation area is determined using a calculation formula that uses the position of the ODA in the ODA column, the touch area, and the amount of area reduction due to the ODA signal line as variables.

Figure 3 is a detailed view of View "A" in Figure 2b.

Referring to Figure 3, the first and second half wings of Row4 ODA are deployed based on the center line (C.L of Row4) of Row4 ODA, and the second half wings of Row3 are located between the first half wings of Row4 ODA. , the first half-wing of Row5 ODA is located between the second half-wings of Row4 ODA.

In each half-wing, a number of rectangles are regularly arranged up, down, left, and right, and the area gradually increases or decreases depending on the upper and lower installation positions. The figure installed inside the second shape ODA but having the same geometric shape is called the third shape ODA. The third shape ODA of the embodiment of Figure 3 is an isosceles square, but any geometric shape in the form of an angle, diamond, or diamond-shaped square or V-shaped there is.

The third shape ODA is not only disposed on the second shape ODA but also installed on the SLH, and all geometric shapes of the object position detection device of the present invention are formed based on the third shape ODA.

Referring to Figure 3, the area of the third shape ODA shown in white is located at the second shape ODA connection portion 124 where the (virtual) center line (C.L of Row4) of Row4 is located, and the area of the third shape ODA is the smallest, and the edge of the half wing is the smallest. ), it can be seen that the area of the third shape ODA gradually increases. The third shape ODA is an area where the conductor constituting the second shape ODA has been removed, and is indicated by a white square in FIG. 3. For reference, Row4 ODA is displayed in dark gray, the same as the example of Figure 2, and Row3 ODA and Row5 ODA are displayed in light gray.

When a touch occurs by an object, the object capacitance (Cobj) formed between the sensing ODA and the object is determined as shown in Equation 1 below.

<Formula 1>

Cobj=eS/d

(e is the dielectric constant, S is the area facing the sensing ODA and the object, and d is the separation distance between the sensing ODA and the object)

Since the third shape ODA is in a state in which the conductor is peeled off, the larger the area of the third shape ODA, the smaller the size of the area “S” in <Equation 1>, which represents the “effective area for detecting touch” (hereinafter referred to as the effective area). Thus, the size of the object capacitance is reduced. In the embodiment of Figure 3, where the area of the third shape ODA is the smallest at the ODA center line and the area of the third shape ODA gradually increases toward the edge of the half wing, the size of the object capacitance (Cobj) by the same touch area is half. It gradually shrinks as it approaches the edge of the wing.

In a non-touch state, the voltage detected by the sensing ODA by applying the driving voltage to the driving ODA is determined as shown in Equation 2 below.

<Equation 2>

(Cd is the mutual capacitance formed between the sensing ODA and the driving ODA facing each other in the intersection area, Ccm is the common electrode capacitance formed when the common electrode of the sensing ODA and the display device face each other, and Cprs is the parasitic capacitance formed on the sensing ODA signal line. capacity, Vp1 is the voltage detected in the sensing ODA when the driving voltage Vd1 is applied to the driving ODA, and Vp2 is the magnitude of the voltage detected in the sensing ODA when the driving voltage Vd2 is applied to the driving ODA)

Additionally, when an object capacitance Cobj is formed between the object and the sensing ODA due to a touch by the object, the voltage detected by the sensing ODA by applying the driving voltage to the driving ODA is determined as shown in Equation 3 below.

<Equation 3>

Comparing <Equation 2> and <Equation 3>, <Equation 3> is the object capacitance Cobj added to the denominator of the transfer function indicated by <Equation 2>. Therefore, when a touch occurs, the result value of <Equation 2> - <Equation 3> becomes greater than zero, so it is possible to determine whether a touch has occurred and extract the touch coordinates by referring to the result value.

In the embodiment of Figure 3, the area of the third shape ODA is the smallest at the center line of the ODA (i.e., the ODA effective area is the widest) and is shown to gradually increase as it moves to the edge of the half wing. However, the area of the third shape ODA is shown as It is also possible to arrange the third shape ODA so that it is widest at the center line of the ODA and gradually becomes smaller as it moves to the edge of the half wing.

The length of the short side of the third shape ODA changes depending on the row position (ODA3L-1 or ODA3L-2, etc.) to which the third shape ODA belongs, but the length of the long side does not change. In the present invention, the top and bottom width of the second shape connecting portion 124 of all ODAs and the length of the half wings are the same, so the number of rows of the third shape ODA included in the half wings is the same.

The row of the third shape ODA included in the first half wing of the Row4 ODA in Figure 3 is denoted as ODA3L, and the row of the third shape ODA included in the second half wing is denoted as ODA3S. At this time, 3 represents the third shape ODA, L represents the far direction (Long), and S represents the short direction (Short).

Referring again to Figure 3, the row area of the third shape ODA indicated by ODA3L-1 is the point where the first half wing of the Row4 ODA begins and the second half wing of the Row3 ODA ends. In addition, the row area of the third shape ODA indicated by ODA3S-1 is the point where the second half wing of Row4 ODA begins and the first half wing of Row5 ODA ends.

The half wings of Row3 ODA and Row5 ODA do not invade the (imaginary) center line of Row4 ODA. In addition, the length of d9, which is the distance from the ending point of the second half wing of Row3 ODA to the center line of Row4 ODA, and d11, which is the distance from the end point of the first half wing of Row5 ODA to the center line of Row4 ODA, are the same. , these rules apply to all ODAs of the present invention.

On the other hand, the row of the third shape ODA where the half-wing starts (for example, ODA3L-1 in Figure 3) is preferably the point where the half-wing of the neighboring ODA installed oppositely in the intersection area ends. do.

The size of the third shape ODA is determined corresponding to the pixel of the display device to avoid moiré phenomenon. More specifically, a pixel is composed of sub-pixels representing Red/Green/Blue, and the size of the third shape ODA is determined to be related to the size of the sub-pixels. In one embodiment, when the size of the third shape ODA has the same relationship with the size of the subpixel, if the size of the subpixel is 70um(H) x 210um(V), the maximum installable area of the third shape ODA is 70um(H). x is determined as 210um(V). At this time, the area of the 3rd shape ODA is 10%, which means that only 7um(H) x 210um(V), which is 10% of the maximum installable area of the 3rd shape ODA, 70um(H) This means that 90% of the area where the conductor is not removed is an effective area where touch can be detected.

In the present invention, the area of the third shape ODA increases or decreases at the same predetermined rate from the starting point of the half wing to the end point of the half wing (in this specification, the area of the third shape ODA from the starting point of the half wing to the end point of the half wing is increased or decreased). (assumed to gradually increase).

Figure 4 is an embodiment of the present invention regarding the area change according to the position of the third shape ODA, which constitutes the half wings of the Row4 ODA and the vertically adjacent Row3 ODA and Row5 ODA.

Referring to Figures 3 and 4, the first half wing of the Row4 ODA is initiated from ODA3L-1 in Figure 3. At this time, assuming that the area of the third shape ODA is 10%, the area of the effective area is 90%. In addition, ODA3L-1 is also the end point of the second half-wing of Row3 ODA, so assuming that the area of the third shape ODA at the end point of the second half-wing of Row3 ODA is 80%, the area of the effective area is 20%. In ODA3L-1, the effective area ratio of Row4 ODA is 90% and the effective area ratio of Row3 ODA is 20%, so the average effective area area of all ODA3L-1 rows is 55%.

In the embodiment of Figure 4, each time the row in which the third shape ODA is located changes, the area of the third shape ODA constituting the first half wing of Row4 ODA and the second half wing of Row3 ODA is increased or decreased by 1%. , it can be seen that the average effective area of all third shape ODA rows is 55%, which is the same size.

Also, by the same rule, the average effective area of all third shape ODA rows in the ODA3S area, which is the intersection area of the second half-wing of Row4 ODA and the first half-wing of Row5 ODA, is 55%.

According to the third shape ODA design technique described above, when the touch area by the pen occupies the area of the two half-wings arranged in the intersection area at the same rate, the object is detected in the two half-wings by the pen moving in the up and down direction. The sum of capacitance is always the same regardless of the pen's position. However, the size of the individual object capacitance detected in the first half-wing and the second half-wing as the pen moves up and down varies from time to time depending on the position of the pen.

In one embodiment, for two ODAs located in the intersection area, when the "touch area" by the pen occupies the area of the two half wings arranged in the intersection area in the same ratio, the "touch area" by the pen touch in the first half wing is Assuming that the area of the “effective area” is s1 and the area of the effective area by a pen touch on the second half wing is s2, the size of s1 + s2 is the same regardless of the position of the pen in the intersection area, and the The size changes in conjunction with the vertical position of the pen. Additionally, the position of the pen is determined by the simple formula s1/(s1+s2) or s2/(s1+s1). (s1 or s2 requires a process to be converted to object capacitance based on Equation 1 to Equation 3, and this process is performed by the Touch IC.)

What is important in the embodiment of the present invention based on Figures 3 and 4 is that the area of the third shape ODA applied at the end and starting point of the third shape ODA row is applied equally to all ODAs, and the third shape ODA row is The area change rate of the third shape ODA is the same size every time it is changed. Additionally, in the intersection area, the starting point of the half-wing of one ODA and the end point of the half-wing of the other ODA are located in the same row.

When the pen is placed on the second shape ODA connection part 124, which is the center of the first shape ODA, a pen touch occurs in three ODAs, including the second shape ODA connection part 124 and two ODAs adjacent to each other above and below.

Assuming that the diameter of the pen tip is 2mm and the top and bottom width of the second shape ODA connection part 124 is 2.5mm, when the pen moves up and down within 2.5mm, which is the top and bottom width of the second shape ODA connection part 124, the second shape ODA connection part 124 moves up and down. Since the change in the area of the first and second half wings of the neighboring ODA in contact with the shape ODA connection portion 124 is not detected, it is measured that there is no movement of the pen in the vertical direction. Therefore, writing with a pen may not be linear and problems may arise where the writing is not recognizable.

In addition, if the vertical width of the second shape ODA connection portion 124 is extremely narrow (for example, 0.2 mm), the second shape A change in area due to the first and second half wings of the neighboring ODA in contact with the ODA connection portion 124 occurs rapidly, and the pen will be observed to move too rapidly in the vertical direction. As a result, the second shape ODA connection part 124 does not function properly as a threshold, and the slight vibration of the pen in the up and down directions based on the second shape ODA connection part 124 is reflected in the writing, making it impossible to write in a natural form. Otherwise, the linearity will suddenly break down, making it impossible to write natural letters.

In order to improve this problem, the lower limit of the upper and lower width of the second shape ODA connection part 124 is 1/3 of the pen tip diameter, and the upper limit is up to the pen tip diameter. If the width of the short side of the second shape ODA connection part 124 is about 1/3 of the pen tip, the pen tip is 1/3 the same as the second shape ODA connection part 124 and the two half wings adjacent to the connection part 124. They share a width of 3 each. As a result, as the pen moves up and down near the connection part 124, a linear change in area occurs between the connection part 124 and the two half wings adjacent to the connection part 124, so that letters are written linearly.

In addition, if the short side of the connection part 124 is the same as the diameter of the pen tip, the area of the half wing adjacent to the connection part 124 is also included in any case in the vertical movement of the pen, so even if excellent linearity is not secured, the vertical movement of the pen is Changes in area due to movement are detected, creating an environment in which writing can at least be written.

When one third shape ODA is installed in the second shape ODA connection part 124 or a plurality of third shape ODAs are arranged in different rows, the area of the third shape ODA included in the ODA connection part 124 is, It is preferable that the linearity of the increase/decrease of the third shape ODA included in the first half-wing and the second half-wing is determined to be continuous. In one embodiment, in the embodiment of Figures 3 and 4, the area of the third shape ODA in ODA3L-1 and ODA3S-1 is 10% and the change rate is 1%, so the third shape ODA disposed in the connection portion 124 is 1%. It is desirable that the area is determined at 9%. If three third area ODAs are arranged in different rows of the connection portion 124, the area of the third shape ODA located at the center line is determined to be 8% and the remaining two are determined to be 9%, and the area of the third shape ODA located at the center line is determined to be 9%, and the area of the third area ODA located at the center line is determined to be 9%. When a three-area ODA is deployed, the two areas located near the center line should be determined to be 8% and the remaining two should be determined to be 9%.

The above description is limited to Row4 ODA to Row5 ODA in FIGS. 3 and 4 as an example, but is not limited to ODA at a specific location and applies to ODA at all locations.

Figure 5 is an embodiment of the present invention in which the second shape ODA is composed of an isosceles triangle.

As in the embodiment of Figure 5, even when the first shape ODA is composed of a second shape ODA of a triangular shape facing upward and downward with respect to the second shape ODA connection portion 124, the shape introduced in the embodiment of Figures 2 to 4 All technical ideas apply equally. As mentioned above, such technological ideas include 1) the construction of a cross-section, and 2) the increase or decrease of the third-shaped ODA in the cross-zone. 3) The sum of the effective areas of the third shape ODA in the transverse direction constituting the first and second half wings in the intersection area is the same, and 4) the start and end points of the third shape ODA row are located in the same row. 5) area compensation, etc.

As will be described later, the problem cited by the present invention in the embodiment of Figure 12 of Cited Invention 1 can be solved by linear area change of the third shape ODA constituting the second shape ODA of the present invention. In addition, since the linear area change of the third shape ODA and the area change of the second shape ODA consisting of triangles occur simultaneously, touch signal detection with better characteristics is possible.

Figure 6 is an embodiment of the present invention regarding a method for reducing and enlarging the area of a third shape ODA. In the second shape ODA 121, which is dark gray and indicates a conductor, a white material is added as the conductor is peeled off. This is an embodiment in which a three-shaped ODA (130) is arranged.

The area of the third shape ODA 130 increases or decreases at the same rate as it is arranged from top to bottom, but increases and decreases left and right based on the virtual longitudinal center line 135. In one embodiment, when the change rate of the area of the third shape ODA according to the top and bottom arrangement is 1%, it changes by 0.5% to the left and 0.5% to the right based on the longitudinal center line 135.

In the embodiment of Figure 6a, the area of the third shape ODA decreases at the same predetermined rate as it moves from the top to the bottom, and in the example of Figure 6b, as it moves from the top to the bottom, the area of the third shape ODA decreases at the same predetermined rate. increases to Since the direction of increase or decrease is determined by consistency with the pixel, it is desirable to determine it through simulation or actual placement at the design stage.

When the third shape ODA is arranged based on the longitudinal center line 135, the spacing, that is, the pitch, of the plurality of adjacent longitudinal center lines 135 is the same. For example, a1 or b1 in Figure 6A is the pitch between adjacent longitudinal center lines 135, and a1 and b1 have the same value. In addition, c1 and d1, which are the pitches of the transverse center line 136 connecting the transverse center points of the third shape ODA, are the same size, and it is preferable that the pitches of the neighboring transverse center lines 136 also have the same size. .

Because the size of the third shape ODA is determined to correspond to the pixel or subpixel of the display device, and the size of the pixels in the display device is the same, the third shape ODA must be arranged evenly. For this reason, the pitch of the longitudinal center line 135 of the neighboring third shape ODA must be the same, and the pitch of the neighboring transverse center line 136 must also have the same size.

The pitch of all transverse center lines included in one half wing, such as ODA3S-1 to ODA3S-11 in Figure 3, is the same size, but the center lines of ODA3S-1 and Row4, which are the transverse center lines 136 at the point of the half wing (C.L of The pitch size of Row4) may have a different value from the pitch of the transverse center line 136 included in the half wing. This is to be used as an offset to place the starting and ending points of the 2nd shape ODA and the 3rd shape ODA at the same location in all ODAs. In this way, in the present invention, the pitch of the transverse center line 136 of the third shape ODA disposed on the half wing of the second shape ODA is the same, but the transverse center line 136 where the third shape ODA starts and the center line of the ODA ( The pitch between C.L) may be different from the pitch of the transverse center line 136 included in the half wing.

Figure 6b shows a case where a left protruding bracket (<) is used as the third shape ODA. As described above, the pitch between the longitudinal center lines 135 included in the half wings is the same, and the pitch between the lateral center lines is also the same.

Figure 7 is an embodiment of the present invention for determining the position of the virtual longitudinal center line 135 and the transverse center line 136 and the angle of the diagonal line when the left or right protruding bracket is used as the third shape ODA. The left protruding bracket used for the third shape ODA in the embodiment of Figure 6b has a third shape ODA longitudinal center line 135 and a transverse center line ( 136) passes. The left protruding bracket is equally reduced or enlarged in the left and right directions with the virtual longitudinal center line 135 as its axis. For example, if 0.1 mm increases to the left of the center point, the width of the diagonal line is determined by increasing 0.1 mm to the right of the center point.

In addition, when a left-projecting bracket or a right-projecting bracket is used in the present invention to reduce or enlarge the area, the angle of the diagonal line before and after the increase or decrease in area based on the longitudinal center line 135 (θ1 and θ2 in FIG. 7) must remain the same. Additionally, it is desirable to maintain the relationship θ1=θ2. The angle of the diagonal line is an important variable that determines the degree of moiré when it is formed opposite a pixel or subpixel of a display device. Therefore, once the angle to minimize moiré is determined, it is desirable to maintain the same angle for the diagonal lines of all brackets. This technical idea is equally applied to the Z-shaped and

Figure 8 is an embodiment of the present invention in which a third shape ODA is formed by a combination of a left protruding bracket and a right protruding bracket. Referring to Figure 8, a white third shape ODA (130) is located based on the second shape ODA (121), which is dark gray and indicates a conductor, but the conductor of the third shape ODA is in a peeled state. .

The ODA column composed of left-projecting brackets and the ODA column composed of right-projecting brackets are used alternately in the longitudinal direction, but a phase difference of 180 degrees is maintained. The advantage of alternating the use of two identical third-shaped ODAs with a phase difference of 180 degrees as shown in FIG. 8 is that, compared to the embodiment of FIG. 6b, which does not do so, the horizontal straight conductor shape between the third-shaped ODAs can be formed into one single shape. By separating it into two horizontal directions instead of placing it in the horizontal direction, the probability that it can be located parallel to the gate signal line 12 of the display device is lowered, resulting in a better effect on moiré avoidance.

As in the case of Figure 8 or Figure 14 described later, the third shape ODA of the present invention can be used alternately in the longitudinal direction while maintaining a phase difference of 180 degrees.

Figure 9 is an embodiment of the present invention regarding the shape of a pen tip used in the object detection device of the present invention. Referring to Figure 9, the length (height) of the pen tip is 5.5 mm, and the diameter of the pen in contact with the object detection device is specified to be 2 mm. Although not shown in the drawing of FIG. 9, when the pen touches the object detection device and a predetermined force is applied, the pen's contact switch is turned on and information that the pen is in contact with the object detection device is notified to the system. do. The host CPU of the system is in a mode that receives pen touch information when the contact switch is turned on, and the pen touch when the pen contact switch is turned off while the pen is hovering in the object detection device. The signal is processed by distinguishing the modes that accept input. In the hovering state, the pen is floating on the upper surface of the protective glass of the object detection device, so the touch area of the pen tip cannot be predicted. On the other hand, when the pen's contact switch is turned on, it indicates that the ODA covered with protective glass and the pen tip made of hard material are in contact with the protective glass, so the pen tip is in contact with the pen tip regardless of the pen's touch location. The touch area is the same as the area shown in the drawing.

In order to design and manufacture the object detection device of the present invention, all information about the pen provided in advance must be taken into consideration. For example, the USI (The Universal Stylus Initiative) Specification sets all specifications for the Stylus Pen, and in order to create an object detection device that conforms to the USI standard, the pen specifications set by the USI must be followed. In addition, MPP (Micro Pen Protocol) also specifies all pen specifications, and in order to use the pen touch in the Windows environment provided by Microsoft, all pen specifications specified in MPP must be followed.

The specifications of the pen include the geometric shape of the pen, such as the diameter of the pen tip, and the frequency and sequence for information (Tx) or information input (Rx) provided based on the size and frequency of the voltage radiated from the pen or frequency modulation ( Sequence), etc. Based on the pen information provided in advance, the number of second shape ODAs or the long and short side widths of the second shape ODA are reflected in the design, and protocol-related matters are also used using firmware to touch IC (300 ) is entered.

Figure 10 is an embodiment of the present invention showing the configuration of the second shape ODA and the correlation with the pen tip touch area. Figures 10a to 10c show the case where the second shape ODA is an isosceles square, and Figures 10d and 10e is the case where the second shape ODA is an isosceles triangle.

Referring to Figure 10, the ODA filled with dark gray as in Figure 2 is Row4 ODA, and Row3 ODA and Row5 ODA filled with light gray are located above and below Row4 ODA, A to L, etc. indicates the touch area and location of the pen tip.

In actual use cases, the short side width of the ODA column is usually about 4 to 5 mm, and the long side width is about 10 to 20 mm. In one embodiment of the present invention, assuming that the short side width of the ODA column is 4 mm, when there are four second shape ODAs in the intersection area as in the case of Figure 10a, the short side pitch width of a single second shape ODA is 1 mm. . In addition, in the case of Figure 10b, since there are 6 second shape ODAs in the intersection area, the short side pitch width of a single second shape ODA is about 0.67 mm, and in the case of Figure 10c, there are 8 second shape ODAs, so there are 8 single shape ODAs. The short side pitch width of the 2-shaped ODA is 0.5mm.

In addition, as in the case of Figures 10d and 10e, when two neighboring first shape ODAs in the intersection area form 5 triangles with 2.5 triangles each, j1 or j2 between the virtual vertical lines passing through the center point of each triangle is defined as the short-side pitch width of the second shape ODA. In the case of Figure 10d, the pitch width of one side for five triangles is 0.8 mm.

When writing on an object detection device with a pen or moving freely for touch, the movement of the pen is detected separately in the ODA as vector quantities in the up-down direction and left-right direction, and the Touch IC (300) detects the touch coordinates in the up-down direction and the touch in the left-right direction. Coordinates are extracted and notified to the host CPU of the system. The top and bottom touch coordinates of the pen are detected by the difference in capacitance ratio of the pen detected in one ODA column or multiple ODAs located above and below multiple ODA columns, and the left and right touch coordinates of the pen are detected by the pen detected in multiple ODA columns. It is determined based on the ratio of capacitance. Therefore, the data referenced to extract the touch coordinates in the up and down directions will refer to data about y1, y2, and y3 extracted from the vertical axis, and to extract the touch coordinates in the left and right directions, x1, x2, We will refer to data such as x3 (y1 or x1, etc. are voltages extracted from Equation 2 or Equation 3 based on the touch area).

If the pen is located somewhere in ODA column 3, even if the width of the pen tip is only 2mm (since the height of the pen tip is 5.5mm in the embodiment of Figure 9), the pen tip is also transmitted through the spatial electromagnetic field in ODA column 2 and ODA column 4. A capacitance is formed, and touch coordinates in the left and right directions can be detected using x2 extracted from ODA column 2, x3 extracted from ODA column 3, and x4 extracted from ODA column 4.

The present invention detects the touch coordinates of the pen in the vertical direction based on the difference in the ratio of the touch effective area of the pen touched on the first and second half wings of the two ODAs opposed to each other in the intersection area. Although the case of the pen is limited to an object, it is possible to extract touch coordinates more easily than a pen in the case of a finger wider than the pen tip, so even if a pen is used as an example of an object in this specification, the same touch detection method is used. This also applies to finger touch.

The embodiment of FIG. 10 assumes that, like the embodiment of FIG. 3, the area of the third shape ODA increases linearly as it moves from the center line of the ODA to the edge of the ODA wing.

In "intersection area 1" in Figure 10a, when pen A' moves downward while maintaining the area where it touched the second shape ODA of Row4 ODA and the area where it touched the first shape ODA of Row5 ODA, the area where pen A' touched the second shape ODA of Row4 ODA is the same. The effective area decreases linearly, and the effective area of Row5 ODA increases linearly. In addition, since the area of the pen touched on Row4 ODA and Row5 ODA is assumed to be the same, regardless of the pen position, the average effective area of Row4 ODA and Row5 ODA is always constant, and only the size of the individual effective area changes linearly.

In this way, the fact that the touch area of the present invention changes linearly due to the pen touch is compared to the non-linear change in which the touch area of the pen changes only at the inflection point where the size of the square changes, as in the case of square 1230 or 1240 in Figure 12 of Cited Invention 1. This shows that improvements have been made and that the present invention is more advanced than Cited Invention 1.

Cited Invention 1 Referring to square 1230 or 1240 in Figure 12, an inflection point where a change in the area of the square occurs is located every 8 or 9 square-shaped shapes, which can be said to be the third shape ODA of the present invention, and the pen is at the inflection point. The touch area changes only when passing. Unlike the present invention, in which a change in the touch area occurs each time the pen moves one bracket in the up and down directions, it can be seen that in Cited Invention 1, a change in the touch area occurs each time the pen passes through 8 or 9 brackets in the same square. .

In Cited Invention 1, pen writing is not written linearly, so automatic recognition of the writing is not possible and there may be problems with visibility. However, in the present invention, the touch area changes every time the position of the third shape ODA changes one by one due to the movement of the pen, and it can be seen that linearity is improved compared to Cited Invention 1. As a result, letters by pen touch are formed more naturally than in Cited Invention 1.

According to the quantitative analysis method, in Cited Invention 1, the touch area changes every 8 to 9 brackets, and in the present invention, the touch area changes for each bracket, so the linearity of the pen in the present invention is 8 compared to Cited Invention 1. It can be seen that it has improved by about 2 to 9 times.

Meanwhile, when pen A' located in intersection area 1 of Figure 10a touches Row4 ODA and Row5 ODA with the same area, the area of the effective area by pen touch in Row4 ODA is called s1, and the area of effective area by pen touch in Row5 ODA is called s1. If the area of the effective area is s2, it has been seen in the example of Figure 4 that the size of s1 + s2 is always constant with respect to the vertical movement of the pen.

When the pen is on the upper side of intersection area 1, the size of s1 is larger than s2, and when the pen is on the lower side of intersection area 1, the size of s2 is larger than s1. At this time, the position of the pen is determined by the simple calculation of s1/(s1+s2) or s2/(s1+s2).

If the pen is located in the second shape ODA connection part 124 of the Row4 ODA, the area is shared with the second half wing of the Row3 ODA and the first half wing of the Row5 ODA, so the weight is based on the areas of the three shared ODAs. Once the center is found, the vertical coordinates of the pen are determined.

Figure 10a is an example where the short side pitch of the second shape ODA is 1/2 of the pen tip. At position A, where the pen with a tip diameter of 2 mm touches the second half-wing of Row3 ODA and the first half-wing of Row4 ODA in the same ratio, the touch area ratio of Row3 ODA and Row4 ODA is 50:50. However, since the touch area ratio of Row4 ODA is larger at position B, a detection error occurs in which the pen is measured to be lower than the actual coordinates. Also, since the touch area of Row3 ODA is larger at position C, a detection error occurs where the pen is located further above the actual coordinates.

Figure 10b is an example where the short side pitch of the second shape ODA is 1/3 of the pen tip. In areas D and F of Figure 10b, the touch areas of Row3 ODA and Row4 ODA are the same, so no detection error occurs. However, in area E, the touch area of Row4 ODA is larger, so a touch coordinate detection error occurs. The difference in area occupancy in area E is improving further compared to B or C.

Figure 10c is an example where the short side pitch of the second shape ODA is 1/4 of the pen tip diameter. Since the touch areas of Row4 ODA and Row5 ODA in area G and area I are the same, no detection error occurs. In addition, coordinate detection errors occur in area H, but it can be seen that the detection errors are improved compared to area B and area E.

Figure 10d shows an example where the second shape ODA is made of a triangle. Unlike the embodiments of Figures 10a to 10c, the second shape ODA is a triangle, and in addition to the area of the effective area changing with a pen touch, the second shape ODA is a triangle. The characteristic of ODA is that its area also changes. In other words, it has the characteristic that the effective area area due to the difference in area of the third shape ODA and the area of the conductor constituting the second shape ODA change together depending on the position of the pen.

J in Figure 10d is a case where the pitch of the short side of the second shape ODA is 1/2 of the pen tip diameter, and is the same length as s1, which is the inside of the square made of two second shape ODA, so the two second shape ODA are touched. The actual pen touch position based on area is normal. If the pitch of the short side of the second shape ODA exceeds 1/2 of the pen tip diameter, a touch coordinate detection error occurs because a touch does not occur in the light gray triangle part of Row5 ODA like j1.

K in FIG. 10D is a case where the pitch of the short side of the second shape ODA is 1/3 of the pen tip diameter, and touches occurred only on three second shape ODAs at the center of the intersection area. As a result, since the area occupancy of the dark gray color of Row4 ODA is larger, a detection error will occur in which the pen touch coordinates are detected lower than the actual position.

Meanwhile, the L position in Figure 10d is a case where the pitch of the short side of the second shape ODA is 1/4 of the pen tip diameter, and is the same length as s2, which is the inside of the square made of two second shape ODA, so there are four second shape ODA The actual pen touch position based on the touch area is normal.

In this way, when the second shape ODA is an isosceles triangle, the maximum pitch of the short side of the second shape ODA is 1/2 of the pen tip diameter. Additionally, the width of the second shape short-side pitch must be determined with a greater denominator, such as 1/2, 1/4, or 1/6 of the pen tip diameter. As a result, in the second shape ODA, pen touches occur in all even numbers rather than odd numbers, so touch coordinate detection errors do not occur.

As seen above, it can be seen that the pen's position detection error is improved as the pitch width of the short side of the second shape ODA is narrower compared to the diameter of the pen tip. However, as a larger number of second-shaped ODAs are installed in the first-shaped ODA, the opposing length of the two second-shaped ODAs opposing each other in the intersection area increases, which increases the size of Cd, which is the mutual capacitance in Equation 2 or Equation 3. Because this weakens touch sensitivity, there is a limit to increasing the number of ODAs of the second shape. The pitch of the short side of the second shape ODA is preferably about 1/4 of the diameter of the pen tip.

Meanwhile, the maximum length of the short side pitch width of the second shape ODA is equal to or less than 1/2 of the pen tip diameter. In the example of Figure 10a, in the case of A1, where the short side pitch of the second shape ODA exceeds 1/2 of the pen tip diameter, most of the Row4 area is detected by the pen touch, so the A1 pen is detected as being located at the upper part of intersection area 1. Even in the case of A2, where the second shape ODA short side pitch exceeds 1/2 of the pen tip diameter, a detection error will occur where the A2 pen is measured as being located at the lower part of intersection area 1. In order to prevent such a large detection error, it is desirable that the short side pitch of the second shape ODA does not exceed 1/2 of the pen tip diameter.

When the outer perimeter of the second shape ODA (121, 122, 123, 125, 126, 127) and the third shape ODA (130) and the ODA signal line (200) of the object detection device of the present invention are installed on the upper surface of the display device in a vertical or horizontal straight line, the configuration of the display device Since moiré phenomenon is induced with the source signal line and gate signal line, which causes the display quality of the display device to deteriorate, a method to avoid this must be introduced.

Figure 11 shows a display device 10 with a resolution of 4 x 6. In reality, the display device 10 will use a very high resolution such as FHD level (1920 x 1080) or UHD level (3840 * 2160), but in the illustrated embodiment, a low level resolution of 4 The example is assumed.

The display device is made up of a set of unit pixels (unit pixels) made up of three sub pixels, including red, green, and blue. In Figure 11, four unit pixels are located in the horizontal direction and six pixel rows are located in the vertical direction, so the resolution is 4 x 6. The pixel voltage provided by the Source Drive IC is supplied to each sub-pixel through the Source Signal Line (11), which is indicated by a thick vertical signal line. The gate signal line (12) is installed horizontally on a different physical layer from the source signal line (11), and the turn-on or turn-off voltage supplied by the Gate Drive IC is transmitted to the TFT (Thin Film), a switching element installed in each sub-pixel. Film Transistor).

Gate turn on voltage is supplied sequentially in the order of G2 → G3 → G4 → G5 → G6 → G1... starting from Gate Line 1 (G1) in the time sharing method, and is sequentially supplied to the pixels in the horizontal direction. Activate . Except for the gate signal line to which the turn-on voltage is applied, the turn-off voltage is applied to the remaining gate signal lines.

Light emitted from the BLU (Back Light Unit) of a display device 10, such as an LCD, is partially blocked by the vertically arranged source signal line 11 or the horizontally arranged gate signal line 12, causing surrounding pixels to appear. A contrast difference occurs. In addition, in self-lighting display devices such as OLED, the vertically arranged source signal line 11 or the horizontally arranged gate signal line 12 does not emit light, resulting in a difference in brightness and darkness from the pixels around the signal line.

If an object detection device in which the second shape ODA and the ODA signal line are horizontal or vertical as shown in Figure 2b is installed on the upper surface of the LCD or OLED, or an object detection device in which the third shape ODA is made vertically and horizontally as shown in Figure 6a is installed, , some light is blocked vertically and horizontally by the conductors that make up the ODA, resulting in a difference in transmittance.

At this time, in some areas, only one or both signal lines of the display device's source signal line (11) or gate signal line (12) are recognized, and in other areas, the source signal line (11) or gate signal line (12) and the second shape ODA of the object detection device are recognized. Alternatively, the third shape ODA or ODA signal lines overlap and are recognized as repetition of light and dark patterns, resulting in a moiré pattern.

The moiré interference phenomenon is interference that occurs when spatial patterns with periodicity overlap, and the pattern caused by the moiré interference phenomenon perceived by the observer is usually called a moiré pattern or moiré phenomenon. Moiré patterns cause deterioration in display quality. These moiré patterns vary in size and shape depending on the size of the pixel, the position of the observer, and the opposing distance between the object detection device and the display device.

One of the ways to avoid such moiré pattern is to have the second shape ODA or third shape ODA or ODA signal line of the object detection device lie on the same horizontal line or the same vertical line as the source signal line 11 and gate signal line 12 of the display device. It is to prevent it from being located.

Figure 12 is an embodiment of the present invention regarding the external appearance of a third shape ODA for avoiding moiré. Among the components of the display device 10 in Figure 11, the source signal line 11 is arranged in the vertical direction, so it is avoided that the source signal line 11 and the longitudinal outline of the third shape ODA are located on the same vertical line. In order to do this, the external shape of the longitudinal long side of the third shape ODA is formed with a diagonal line so as to form a predetermined angle with the vertical line (the third shape ODA in FIG. 12, shown in gray, means that the conductor has been removed).

The third shape ODA determines the external shape of the second shape ODA, and as in the embodiment of Figure 13, the external shape of the ODA signal line is also determined by the third shape ODA, so the second shape ODA and The ODA signal line 200 is also formed diagonally. Accordingly, all geometric shapes constituting the object detection device of the present invention are formed with diagonal lines based on the external shape of the third shape ODA.

The long side of the left or right protruding angle bracket in Figure 12 is composed of two diagonal lines having different angles, and has an inflection point at the center point of the intersection area of the two diagonal lines.

Since the gate signal line 12 of the display device 10 is installed horizontally, the short side of the third shape ODA must be formed as a diagonal line having a predetermined angle with the horizontal line. At this time, the diagonal line may be composed of a single diagonal line, two composite diagonal lines with one inflection point, or a composite diagonal line with two or more inflection points.

In Figure 12, the short side of all third shape ODAs except Figure 12f is composed of a composite diagonal line consisting of two diagonal lines and one inflection point to avoid being located in the same horizontal direction as the gate signal line 12. Also, Figure 12f is composed of three diagonal lines and a compound diagonal line with two inflection points.

When increasing or decreasing the area of the third shape ODA in the form of a bracket according to the position of the third shape ODA among the half wings of the second shape ODA, as in the embodiment of Figure 12a, the center line (C.L.), which is the center of the intersection area of two diagonal lines, is left and right. The area is reduced or expanded at the same rate.

In Fig. 12a, the short side protrudes downward, and in Fig. 12b, the phase is opposite to that of Fig. 12a. 12A and 12B can be used simultaneously next to each other with a phase difference of 180 degrees, as in the embodiment of FIG. 8.

In addition, the short side of Figure 12c protruded upward, the short side of Fig. 12d protruded both the upper and lower sides, and the short side of Fig. 12e protruded downward and upward. Figures 12D and 12E are adjacent to each other vertically and can be continuously stacked.

As in the embodiment of Figure 12, the short side of the third shape ODA can protrude in one direction, upward or downward, by a double diagonal line, and can protrude in both upward and downward directions. In addition, the third shape ODA, whose short sides protrude upward and downward, can be continuously stacked adjacent to each other vertically.

The embodiment based on the angle-shaped short side in Figure 12 is a variety of methods in which the gate signal line installed horizontally in the display device and the third-shaped ODA short side are not positioned in the same horizontal direction, and are positioned at a predetermined angle with respect to the horizontal direction. The branches have the characteristic of being composed of diagonal lines. Although a bracket is used as an example in the embodiment of Figure 12, it can be applied to any third shape ODA consisting of various geometric shapes such as a parallelogram, X type, or V type.

The shape of the short side of the third shape ODA is formed as a single diagonal line as in the embodiment of FIGS. 15 to 16 described later, or as two diagonal lines as in FIGS. 12A to 12E, or as a plurality of two or more as in FIG. 12F. Since the diagonal lines are related to the size of the sub pixel, it is desirable to secure an appropriate method through simulation or matching in the actual product.

Meanwhile, referring to Figure 12 or Figure 13 of Cited Invention 1, it can be seen that the long side of the inequality fine pattern is formed as a diagonal line, but the short side is formed as a straight line. The bracket pattern of the present invention has a structure substantially similar to the inequality fine pattern of Cited Invention 1, and from the viewpoint that diagonal lines that can avoid the moiré phenomenon are applied to both the long and short sides, the bracket type of the present invention is similar to the embodiment of Figure 1. It can be seen that it is an advanced structure.

Figure 13 is an embodiment of the present invention regarding a third shape ODA implementation mode used in SLH, which is a bundle of ODA signal lines. In Figure 13, dark gray is the ODA signal line 200 constituting the SLH and is made of a conductor, and white is the third shape ODA with the conductor peeled off.

Referring to Figure 13, the ODA signal line 200 has multiple inflection points and is electrically insulated by a third shape ODA continuously connected up and down. Referring to the embodiment of Figure 1, the signal line of Row3 ODA will be located to the right of the Row4 ODA signal line, and the signal line of Row5 ODA will be located to the left of the Row4 ODA signal line.

Referring to Figure 2b, the starting point of the ODA signal line 200 is disposed opposite to the second shape ODA constituting the neighboring ODA in a partial area. At this time, the pitch of the longitudinal center line 135 and the pitch of the transverse center line 136 of the third shape ODA constituting the ODA signal line 200 are maintained at the same pitch as the pitch applied to the half wing of the neighboring ODA. desirable.

Since the ODA signal line 200 does not detect touch, the size of the third shape ODA constituting the ODA signal line 200 can be configured to be the same size, and maintains the same or similar area as the surrounding third shape ODA. It is also desirable not to cause poor visibility due to area difference of the third shape ODA.

The size of the line resistance of the ODA signal line connecting the ODA placed at a distance is proportional to the length of the signal line and inversely proportional to the width of the line resistance, so the width of the signal line is sometimes configured to be wide to reduce the size of the line resistance. .

In the embodiment of Figure 13, the signal line 200 of the Row2 ODA is located at a long distance, so the signal line width is configured to be wide to reduce the line resistance of the ODA signal line 200. At this time, if the width of the signal line is widened, a difference in transmittance occurs due to a difference in density of the third shape ODA per unit area, which may cause poor visibility when the ODA signal line 200 of Row2 ODA is recognized. To solve this problem, a dummy third shape ODA is placed on the ODA signal line of Row2 ODA to have a similar density to the surrounding third shape ODA. “Similar density” means that the pitch size of the longitudinal center line 135 of the dummy third shape ODA is the same as the pitch size of the adjacent longitudinal center line 135.

The dummy third shape ODA, unlike the adjacent third shape ODA that is continuously connected in order to electrically separate the ODA signal lines, must electrically connect the ODA signal lines 200 on which it is placed, so it is separated from each other and stacked up and down.

If the second shape ODA is alternately used with a third shape ODA whose mutual phases are inverted as in the embodiment of FIG. 8, the ODA signal line is also alternately used with a third shape ODA whose mutual phases are inverted, and It is arranged to achieve consistency with the 2-shaped ODA.

In this way, in the present invention, a third shape ODA continuously connected to the SLH, which is a bundle of ODA signal lines, is used for electrical insulation, and a dummy third shape ODA can be placed between the continuously connected third shape ODA. At this time, the pitch between the longitudinal center line 135 of the dummy third shape ODA and the longitudinal center line 135 of the neighboring third shape ODA is the longitudinal center line 135 of the third shape ODA constituting the neighboring second shape ODA. ) has the same size as the pitch. In addition, the third shape ODA and the dummy third shape ODA must have the same outline to avoid poor visibility.

Figure 14 is an embodiment of the present invention in which a third shape ODA is composed of a combination of a left protruding bracket and a right protruding bracket.

Figure 14 is a part of the second shape ODA 121 constituting the first shape ODA, and the second shape ODA is composed of a plurality of third shape ODAs having an angle bracket shape. The third shape ODA 130 in FIG. 14 has diagonal lines for moiré avoidance applied to the long and short sides, and therefore shows better moiré avoidance characteristics compared to the embodiment of cited invention 1 in which diagonal lines are applied only to the long side. In addition, the left-hand protruding bracket and the right-hand protruding bracket are alternately used with a phase difference of 180 degrees, so that the conductor between the short sides is distributed into two rows, so the frequency of the conductor between the short sides being positioned parallel to the gate signal line 12 is reduced by half, reducing moiré. It shows superior characteristics in evasion.

The sizes of a1 and a2, which are the pitches of the longitudinal center line 135 passing through the center of the left protruding bracket, are the same, and the sizes of b1 and b2, which are the pitches of the longitudinal center line 135 passing through the center of the right protruding bracket, are also the same. do. Also, preferably, the sizes of a1 and b1 are the same.

In addition, the sizes of c1 to c4, which are the pitches of the transverse center lines 136 passing through the lateral centers of the left and right protruding brackets, are also the same.

Figure 15 is an embodiment of the present invention in which the short side of the bracket is composed of a single diagonal line. In the embodiment of Figure 14, the left-projecting bracket and the right-projecting bracket are used alternately in different columns with a phase difference of 180 degrees, but in the embodiment of Figure 15, the left-projecting bracket and the right-projecting bracket are used together in the same column. There is a characteristic.

The short side of the bracket is formed as a diagonal line at a predetermined angle with respect to the horizontal direction, and the diagonal lines on the upper and lower short sides of the bracket are preferably formed at an angle of the same size based on the lateral center line 136. In one embodiment, when the angle of the upper short side diagonal line is 30 degrees, the angle of the lower short side is -30 degrees.

In addition, the virtual longitudinal center line passing through the center point of the left-projecting brackets passes through the center points of all left-projecting brackets, and the longitudinal center line passing through the center points of right-projecting brackets also passes through the center points of all right-projecting brackets.

In addition, as in the case of Figure 14, the pitch of the virtual longitudinal center line 135 connecting the center point of the left protruding bracket is the same size, and the pitch of the virtual longitudinal center line 135 connecting the center point of the right protruding bracket The pitches are also the same size.

The embodiment of Figure 15 has the characteristics that left-projecting brackets and right-projecting brackets are used in a continuous stack up and down in one ODA column, and that one diagonal line is used on the short side, but there are two diagonal lines on the short side, as in the embodiment of Fig. 12. It is also possible to consist of a composite diagonal line with a diagonal line and one inflection point, or a composite diagonal line with two or more inflection points, and it is desirable to select a direction that minimizes moiré in consideration of consistency with the display device 10.

Figure 16 is an embodiment of the present invention in which the "Z" Type is used as the third shape ODA.

When the pixel has a stripe structure as in the embodiment of Figure 11, the bracket type is often used as an embodiment of the third shape ODA. However, when the pixel has a delta structure, a Z-shaped third shape ODA consisting of three diagonal lines and two inflection points may be more effective against moiré. If the pixel has a delta structure, the R/G/B sub-pixel is located in a triangular shape, so more bending may be required than an angle shape.

Additionally, even in a stripe-structured pixel arrangement, the Z type can have a more effective moiré prevention effect than the angle-shaped structure by adjusting the angle and length of the diagonal lines.

In FIG. 15, the lengths of a1 to a4, which are the pitches of the longitudinal center line 135 passing through the center of the left protruding shape constituting the Z type, are preferably the same. In addition, it is preferable that the lengths of b1 to b3, which are the pitches of the longitudinal center line 135 passing through the center of the right protruding shape of the Z type, are the same, and the lengths of a1 and b1 may be the same or different from each other. In addition, it is preferable that the lengths of c1 to c3, which are the pitches of the transverse center lines 136 passing through the two inflection points of the Z type, are the same.

In FIG. 16, the diagonal portions at the top and bottom of the Z shape are composed of a single diagonal line, but it is also possible to configure them with a plurality of composite diagonal lines as in the embodiment of FIG. 12. Additionally, it is desirable that the top and bottom diagonal angles are the same.

Figure 17 is an embodiment of the present invention in which the "X" Type is used as the third shape ODA, and refers to a part of the second shape ODA (121) composed of the

Referring to Figure 17, the third shape ODA of the X type with the conductor peeled off is displayed in white, and dark gray is the effective area. The X type is composed of a V at the top and an inverted V at the bottom, and the waist part of the It is preferable that the angle between the upper V and the lower V is the same.

Between the X types stacked up and down, there is a diamond-shaped effective area as shown in Figure 17a. Therefore, in order to increase or decrease the area of the effective area, between the The conductor may be removed.

The short side is composed of double diagonal lines, but it can also be composed of a single diagonal line with a predetermined angle to the horizontal direction, or it can also be composed of two or more compound diagonal lines.

The pitch of the longitudinal center lines 135 passing through the center point of the left angle bracket of the It is the same as described in the example. In addition, the pitch length of the horizontal center line passing through the waist of the X type is the same as that described in the embodiment of Figure 14 or Figure 16.

The reason why the vertical pitch or the horizontal pitch is the same is because the pixels constituting the display device are arranged regularly and the arrangement of the third shape ODA is determined corresponding to the pixel, so the third shape ODA must also be arranged regularly.

The foregoing description of the present invention is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be.

Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is indicated by the patent claims described later, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

10: display device
11: Source Signal Line
12: Gate Signal Line
20: Object
100: ODA (Object Detection Area)
110: 1st shape ODA
121: 2nd shape ODA
122: 2nd shape ODA
123: 2nd shape ODA
124: Second shape ODA connection part
125: 2nd shape ODA
126: 2nd shape ODA
127: 2nd shape ODA
130: 3rd shape ODA
135: Longitudinal center line of the third shape ODA
136: Transverse center line of third shape ODA
200: ODA signal line
300: Touch IC

Claims (7)

Touch IC, which controls the touch process;
An ODA column consisting of a plurality of first shape object detection areas (ODA) stacked up and down based on the Touch IC;
a plurality of ODA signal lines connected one to each of the first shape ODA;
A signal line harness (SLH), which is a bundle of the plurality of ODA signal lines;
A third shape ODA stacked vertically for electrical insulation between signal lines in the SLH; and
An object position detection device characterized in that a dummy third shape ODA separately stacked upward and downward is added between the third shape ODA connected and stacked above and below.
According to paragraph 1,
Object position detection device characterized in that the third shape ODA and the dummy third shape ODA have the same shape.
According to paragraph 1,
Object position detection device, characterized in that the area of the third shape ODA stacked vertically connected is the same.
According to paragraph 1,
Object position detection device, characterized in that the area of the dummy third shape ODA separately stacked up and down is the same.
According to paragraph 1,
An object position detection device characterized in that the area of the third shape ODA stacked vertically is the same as the area of the neighboring third shape ODA.
According to paragraph 1,
Object position, characterized in that the vertical outline of the third shape ODA and the dummy third shape ODA are composed of diagonal lines having a predetermined angle with respect to the vertical line, and the left and right outlines are also composed of diagonal lines having a predetermined angle with respect to the horizontal line. detection device
According to paragraph 2,
Object position detection device characterized in that the third shape ODA and the dummy third shape ODA are angle-shaped.