KR102660308B1 - Apparatus for touch screen and electronic device comprising the same - Google Patents

Abstract

The present application provides a touch screen device capable of detecting temperature without using a temperature sensor and an electronic device including the same. The touch screen device includes a touch screen with a touch sensor, and a touch screen by sensing electrical changes in the touch sensor. It may include a touch driving circuit that generates raw data and calculates a predicted temperature based on the touch raw data.

Description

Touch screen device and electronic device including same {APPARATUS FOR TOUCH SCREEN AND ELECTRONIC DEVICE COMPRISING THE SAME}

This application relates to a touch screen device and an electronic device including the same.

A touch screen device is a type of input device that inputs information through contact with the screen of a display device in various electronic devices without a separate input device. These touch screen devices include electronic organizers, e-books, Portable Multimedia Players (PMPs), navigation, Ultra Mobile PCs (UMPCs), mobile phones, smart phones, smart watches, and tablet PCs (Personal Computers). , It is used as an input device for various products such as televisions, laptops, and monitors, as well as portable electronic devices such as watch phones and mobile communication terminals.

Recently, as user interface environments such as applications that require touch information about 3D touch are being established, development and research on touch screen devices capable of sensing 3D touch and electronic devices including the same are in progress.

A conventional touch screen device provides three-dimensional touch information by calculating a touch position by sensing a change in capacitance of a touch sensor and calculating a touch force level by sensing a change in resistance value of a force sensor.

However, the conventional touch screen device has a problem in that the accuracy of force sensing is reduced due to variation in the resistance value of the force sensor for the same load when the ambient temperature of the electronic device and/or the temperature rises due to long-time operation of the electronic device.

In addition, conventional electronic devices include a display panel with a thin film transistor, and as the driving characteristics of the thin film transistor change due to temperature rise due to ambient temperature and/or long-time operation, image quality deterioration such as afterimage, flicker, and crosstalk occurs. There is a problem that arises.

Problems such as reduced accuracy of force sensing and lowered image quality of the display panel due to temperature can be solved through temperature compensation using a separate temperature sensor.

However, as a separate temperature sensor is used, the number of parts and manufacturing terminals of the electronic device increases.

The content of the background technology described above is technical information that the inventor of this application possessed for the purpose of deriving this application or was acquired in the process of deriving this application, and must be regarded as known technology disclosed to the general public before filing this application. It is impossible.

This application is intended to solve the problems of the background technology, and its technical task is to provide a touch screen device that can detect temperature without using a temperature sensor and an electronic device including the same.

A touch screen device according to the present application for achieving the above-described technical problem is a touch screen having a touch sensor, and a touch screen that senses electrical changes in the touch sensor to generate touch raw data and calculate a predicted temperature based on the touch raw data. It may include a driving circuit.

A touch driving circuit according to an example may generate touch raw data by sensing a change in capacitance of a touch sensor.

The touch driving circuit according to one example generates touch raw data by sensing a change in the resistance value of the touch sensor while supplying a force driving signal to the touch sensor in the no touch section and calculates the predicted temperature based on the touch raw data. can do.

The electronic device according to the present application for achieving the above-mentioned technical problem includes a display panel, a display driving circuit connected to the display panel, a touch screen device overlapping with the display panel, and a host control circuit that controls each of the display driving circuit and the touch screen device. The touch screen device includes a touch screen having a touch sensor, and a touch driving circuit that generates touch raw data by sensing electrical changes in the touch sensor and calculates a predicted temperature based on the touch raw data.

In an electronic device according to one example, a touch driving circuit of a touch screen device may supply the predicted temperature to at least one of a display driving circuit and a host control circuit. The display driving circuit may control heat generation of the display panel based on the predicted temperature.

According to the solution to the above problem, the touch force level can be sensed more accurately despite temperature changes, and the temperature of the electronic device can be adjusted or compensate for the deterioration in image quality of the display panel due to temperature without a separate temperature sensor.

1 is a block diagram schematically showing a touch screen device according to an example of the present application.
Figure 2 is a graph to explain the change in resistance value of the touch sensor in response to temperature change.
FIG. 3 is a block diagram for explaining the configuration of the touch sensing circuit shown in FIG. 1.
FIG. 4 is a waveform diagram for explaining the force driving signal shown in FIG. 3.
Figure 5 is a perspective view showing an electronic device according to an example of the present application.
FIG. 6 is a schematic cross-sectional view taken along line II' shown in FIG. 5.
FIG. 7 is a cross-sectional view for explaining the structure of the second touch sensing unit shown in FIG. 6.
FIG. 8 is a cross-sectional view for explaining the formation process of the second touch sensor in the second touch sensing unit shown in FIG. 7.
9A and 9B are diagrams showing the touch force level according to the touch force in the room temperature and low temperature environments of the touch screen device in the comparative example and the present example.

The advantages and features of the present application and methods for achieving them will become clear by referring to examples described in detail below along with the accompanying drawings. However, the present application is not limited to the examples disclosed below and will be implemented in various different forms, and only the examples of the present application are intended to ensure that the disclosure of the present application is complete and are within the scope of common knowledge in the technical field to which the present application pertains. It is provided to fully inform those who have the scope of the invention, and this application is only defined by the scope of the claims.

The shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining an example of the present application are illustrative, and the present application is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present application, if it is determined that a detailed description of related known technology may unnecessarily obscure the gist of the present application, the detailed description will be omitted.

When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

In the case of a description of a temporal relationship, for example, if a temporal relationship is described as 'after', 'successfully after', 'after', 'before', etc., 'immediately' or 'directly' Unless used, non-consecutive cases may also be included.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present application.

The term “at least one” should be understood to include all possible combinations from one or more related items. For example, “at least one of the first, second, and third items” means each of the first, second, or third items, as well as two of the first, second, and third items. It can mean a combination of all items that can be presented from more than one.

Each feature of the various examples of the present application can be partially or entirely combined or combined with each other, and various technological interconnections and operations are possible, and each example may be implemented independently of each other or together in a related relationship. .

Hereinafter, a preferred example of a touch screen device and an electronic device including the same according to the present application will be described in detail with reference to the attached drawings. In adding reference numerals to components in each drawing, identical components may have the same reference numerals as much as possible even if they are shown in different drawings.

1 is a block diagram schematically showing a touch screen device according to an example of the present application.

Referring to FIG. 1, a touch screen device according to an example includes a touch screen 110 having a touch sensor, and a touch driving circuit 130 connected to the touch screen 110.

The touch screen 110 is intended to provide an input interface through touch and is configured to sense each touch position and touch force by a touch input object. Here, the touch input object may be a human body part (eg, a finger) or a conductive object. The touch screen 110 according to one example includes a first touch sensing unit 111 and a second touch sensing unit 113.

The first touch sensing unit 111 is arranged to overlap the display panel 300 that displays an image. For example, the first touch sensing unit 111 may be placed in front of the screen of the display panel 300 that displays an image or may be provided inside the display panel 300. The first touch sensing unit 111 includes a plurality of first touch sensors whose mutual capacitance or self-capacitance changes depending on the touch.

Each of the plurality of first touch sensors is for sensing the touch position of a touch input object touched on the touch screen 110. As an example, the mutual capacitance of each of the plurality of first touch sensors is formed between the touch driving electrode and the touch sensing electrode, and may be reduced when a touch input object is touched. As another example, the self-capacitance of each of the plurality of first touch sensors is formed between the touch electrode and the touch input object, and may increase when the touch input object is touched.

The second touch sensing unit 113 is arranged to overlap the display panel 300 and the touch sensing unit 110. For example, the second touch sensing unit 113 may be placed on the rear of the display panel 300 or in front of the first touch sensing unit 111. This second touch sensing unit 113 includes a plurality of second touch sensors whose resistance value changes according to the touch force generated by the touch input object.

Each of the plurality of second touch sensors is for sensing a touch force level caused by a touch force of a touch input object, and includes a resistor selectively formed between at least one force driving electrode and at least one force sensing electrode. The resistance value of the second touch sensor changes according to the contact area between the force driving electrode and the force sensing electrode disposed with the resistive member interposed according to the touch force (or touch pressure) caused by the touch input object. For example, the resistance value of the second touch sensor may decrease as the contact area increases.

The touch driving circuit 130 is connected to the touch screen 110 and senses the touch position and touch force of the touch input object on the touch screen 110, respectively.

The touch driving circuit 130 according to an example senses the touch position through each of the plurality of first touch sensors provided in the first touch sensing unit 111 based on the touch synchronization signal (Tsync), and the second touch sensing unit Touch force is sensed through each of the plurality of second touch sensors provided at 113. That is, the touch driving circuit 130 generates first touch raw data by sensing electrical changes in the first touch sensor, generates second touch raw data by sensing electrical changes in the second touch sensor, and then generates first touch raw data. Based on the touch raw data, touch force level data is generated based on the touch position data and the second touch raw data, and 3D touch information (TI) including the touch position data and touch force level data is generated to be sent to an external host. Output to the control circuit 500. Here, the touch position data may be defined as digital information of each of the X-axis coordinate and Y-axis coordinate for the touch position, and the touch force level data may be defined as digital information of the Z-axis coordinate or touch force level for the touch position. It can be.

The touch driving circuit 130 according to an example may simultaneously perform touch position sensing through a first touch sensor and touch force sensing through a second touch sensor, or may perform touch position sensing first and then perform touch force sensing. .

The touch driving circuit 130 according to an example generates first touch raw data by sensing electrical changes in the first touch sensor without using a separate temperature sensor, and generates a predicted temperature based on the first touch raw data. Calculate That is, the touch driving circuit 130 generates first touch raw data by sensing the electrical change of the first touch sensor in each no touch section or touch sensing section, and generates the predicted temperature based on the first touch raw data. can be calculated. More specifically, the touch driving circuit 130 supplies a touch driving signal to the first touch sensor, generates first touch row data by sensing a change in capacitance of the first touch sensor, and generates first touch row data based on the first touch row data. The predicted temperature can be calculated. As an example, the touch driving circuit 130 may calculate the temperature mapped to the reference touch row data corresponding to the first touch row data as the predicted temperature based on the reference touch row data for each temperature stored in the memory unit. As another example, the touch driving circuit 130 may calculate the predicted temperature corresponding to the first touch raw data using calculation logic without using a memory unit. In this case, calculation of the reference touch row data and the first touch row data The predicted temperature can be calculated through . Here, the reference touch raw data may be set as the first touch raw data generated during touch sensing performed at room temperature.

The touch driving circuit 130 according to an example generates force driving pulse information based on the predicted temperature calculated from the first touch raw data, and generates a force driving signal according to the force driving pulse information to drive the second touch sensing unit ( While supplying the data to the second touch sensor of 113), second touch raw data is additionally generated by sensing electrical changes in the second touch sensor. That is, the second touch sensor of the second touch sensing unit 113 has a characteristic in which the resistance value changes depending on the temperature, as shown in FIG. 2. For example, the resistance value of the second touch sensor increases as the temperature of the second touch sensing unit 113 increases. Therefore, the touch driving circuit 130 dynamically changes the driving conditions of the second touch sensing unit 113, that is, the second touch sensor, through a temperature compensation algorithm based on the predicted temperature, and thereby changes the operating conditions according to the temperature change. By compensating for the variation in resistance value of the second touch sensor, the resistance value of the second touch sensor is sensed more accurately without variation due to temperature.

The touch driving circuit 130 according to this example does not use a separate temperature sensor, but uses first touch raw data generated based on the change in capacitance of the first touch sensor, which is relatively less sensitive to temperature changes. By calculating the predicted temperature and changing the driving conditions of the second touch sensor according to the predicted temperature, the deviation in the resistance value change of the second touch sensor depending on the temperature for the same touch force is compensated to achieve a more accurate change in the resistance value of the second touch sensor. It can be sensed. Additionally, the touch driving circuit 130 according to an example uses the predicted temperature calculated based on the change in capacitance of the first touch sensor to one of the display driving circuit and the host control circuit 500 that drive the display panel 300. You can provide at least one.

The touch driving circuit 130 according to another example generates second touch raw data by sensing electrical changes in the second touch sensor, and calculates a predicted temperature based on the second touch raw data. That is, the touch driving circuit 130 supplies a force driving signal to the second touch sensor in the no touch section and generates second touch raw data by sensing a change in the initial resistance value of the second touch sensor according to temperature. And, the predicted temperature can be calculated based on the second touch raw data. Furthermore, the touch driving circuit 130 changes the pulse shape of the force driving signal based on the predicted temperature and supplies it to the second touch sensor, while sensing the change in the resistance value of the second touch sensor, thereby controlling the pulse shape of the second touch sensor according to the temperature change. Compensate for changes in resistance value. As an example, the touch driving circuit 130 may calculate the temperature mapped to the reference touch row data corresponding to the second touch row data as the predicted temperature based on the reference touch row data for each temperature stored in the memory unit. As another example, the touch driving circuit 130 may calculate the predicted temperature corresponding to the second touch row data using calculation logic without using a memory unit. In this case, calculation of the reference touch row data and the second touch row data The predicted temperature can be calculated through . Here, the reference touch raw data may be set as second touch raw data generated during touch sensing performed at room temperature.

The touch driving circuit 130 according to this other example generates second touch raw data by sensing the change in the initial resistance value of the second touch sensor according to temperature without using a separate temperature sensor, and makes predictions based on this. After calculating the temperature, the second touch raw data is compensated according to the calculated predicted temperature, thereby compensating for the deviation of the resistance value change of the second touch sensor depending on the temperature for the same touch force, thereby providing a more accurate change in the resistance value of the second touch sensor. It can be sensed. Additionally, the touch driving circuit 130 according to another example does not use a separate temperature sensor, but uses the predicted temperature calculated based on the change in the initial resistance value of the second touch sensor to drive the display panel 300. It may be provided to at least one of the driving circuit and the host control circuit 500.

The host control circuit 500 may be an application processor of an electronic device having a touch screen 110. This host control circuit 500 receives 3D touch information (TI) output from the touch driving circuit 130 and executes an application corresponding to the received 3D touch information (TI). Additionally, the host control circuit 500 may perform a temperature compensation algorithm to reduce or increase the temperature of the electronic device by controlling the heat generation of the display panel 300 based on the predicted temperature provided from the touch driving circuit 130. You can.

As such, the touch screen device according to this example does not use a separate temperature sensor, but calculates the predicted temperature based on touch raw data and dynamically changes the operating conditions of touch force sensing, thereby providing temperature-dependent response to the same touch force. The accuracy of touch force sensing may be improved by compensating for the variation in resistance value of the second touch sensor.

FIG. 3 is a block diagram for explaining the configuration of the touch sensing circuit shown in FIG. 1.

Referring to FIGS. 1 and 3 , the touch driving circuit 130 according to one example is comprised of an integrated circuit connected to the touch screen 110 . At this time, the touch driving circuit 130 may be connected to the touch screen 110 through a flexible circuit film and may be mounted on the flexible circuit film. The touch driving circuit 130 is electrically connected to the first touch sensing unit 111 and the second touch sensing unit 113 of the touch screen 110.

The touch driving circuit 130 is connected one-to-one with a plurality of touch driving electrodes (T_Tx) provided in the first touch sensing unit 111 through a plurality of first touch routing lines (TRL1), and is connected to a plurality of second touch routing lines (TRL1). It is connected on a one-to-one basis with a plurality of touch sensing electrodes (T_Rx) provided in the first touch sensing unit 111 through the line (TRL2). In addition, the touch driving circuit 130 is connected one-to-one with at least one force driving electrode (F_Tx) provided in the second touch sensing unit 113 through at least one first force routing line (FRL1), and at least one It is connected on a one-to-one basis with at least one force sensing electrode (F_Rx) provided in the second touch sensing unit 113 through the second force routing line (FRL2).

The touch driving circuit 130 according to one example includes a sensing unit 131, a touch control circuit 133, and a memory unit 135.

The sensing unit 131 generates first touch raw data TRD1 according to the change in capacitance of each of the plurality of first touch sensors TS1 through touch position sensing under the control of the touch control circuit 133, Second touch raw data TRD2 is generated according to the change in resistance value of each of the plurality of second touch sensors TS2 through touch force sensing under the control of the touch control circuit 133. At this time, the sensing unit 131 may perform touch position sensing and touch force sensing simultaneously, or may perform touch position sensing first and then perform touch force sensing. The sensing unit 131 according to one example includes a driving signal generator 131a, a channel portion 131b, and a raw data generator 131c.

The driving signal generating unit 131a generates a touch driving signal TDS having at least one touch driving pulse according to the touch control circuit 133 and provides the touch driving signal TDS to the channel unit 131b. In addition, the driving signal generator 131a generates a force driving signal (FDS) having at least one touch driving pulse based on the force driving pulse information (FDPI) provided from the touch control circuit 133 to generate a force driving signal (FDS) with the channel unit 131b. ) is provided. Here, the force driving signal (FDS) has at least one touch driving pulse corresponding to force driving pulse information (FDPI) having reference amplitude information, reference width information, and reference number information, or amplitude information according to the above-described predicted temperature. It may have at least one touch driving pulse corresponding to force driving pulse information (FDPI) in which at least one of the width information and the number information has been changed.

The channel unit 131b transmits the touch drive signal (TDS) from the drive signal generator 131a based on the touch channel selection signal provided from the touch control circuit 133 to a plurality of first touch routing lines in a predetermined order. (TRL1) is supplied to a plurality of touch driving electrodes (T_Tx) through each, and the raw data generator 131c is supplied to a plurality of touch driving electrodes (TRL2) through each of a plurality of second touch routing lines (TRL2) based on the touch channel selection signal. Connect to each sensing electrode (T_Rx).

The channel unit 131b routes the force driving signal (FDS) from the driving signal generator 131a to at least one first force routing in a predetermined order based on the force channel selection signal provided from the touch control circuit 133. It is supplied to at least one force driving electrode (F_Tx) through the line (TRL1), and based on the force channel selection signal, the raw data generator (131c) is supplied to the plurality of raw data generators (131c) through each of at least one second force routing line (FRL2). Connect to each force sensing electrode (F_Rx).

The raw data generator 131c generates first touch raw data TRD1 corresponding to a change in capacitance of each of the plurality of first touch sensors TS1 through each of the plurality of second touch routing lines TRL2. Provided to the touch control circuit 133, and generating second touch row data (TRD2) corresponding to a change in resistance value of each of the plurality of second touch sensors (TS2) through each of the plurality of second force routing lines (FRL2). and provides it to the touch control circuit 133.

The raw data generator 131c according to an example amplifies the charge of the touch sensing electrode (T_Rx) according to the capacitance of the first touch sensor TS1 to generate a touch sensing signal in analog form and digitally converts the touch sensing signal. Thus, first touch raw data TRD1 can be generated. In this case, the raw data generator 131c includes a plurality of integration circuits including a comparator that generates a touch sensing signal by comparing the signal received from the touch sensing electrode (T_Rx) and a reference voltage, or two adjacent touch sensing lines It may include a plurality of integrator circuits including a differential amplifier that amplifies the difference between signals received from (T_Rx) to generate a touch sensing signal. In addition, the raw data generator 131c according to an example amplifies the voltage of the force sensing electrode (F_Rx) according to the resistance value of the second touch sensor TS2 to generate a force sensing signal in analog form, and generates a force sensing signal may be digitally converted to generate second touch raw data TRD2. In this case, the raw data generator 131c may include at least one inverting amplifier that generates a force sensing signal by amplifying the voltage according to the resistance value of the second touch sensor TS2.

The touch control circuit 133 is an MCU (Micro Controller Unit) that receives a touch synchronization signal (Tsync) supplied from the outside and determines the driving timing of the touch driving circuit 130 based on the received touch synchronization signal (Tsync). control.

The touch control circuit 133 according to an example receives first touch raw data (TRD1) provided from the sensing unit 131, and calculates the predicted temperature (ET) based on the received first touch raw data (TRD1). Calculate The touch control circuit 133 according to an example may calculate the predicted temperature ET corresponding to the first touch raw data TRD1 based on the reference touch raw data for each temperature stored in the memory unit 135. That is, the touch control circuit 133 selects the reference touch row data corresponding to the first touch row data TRD1 from the first look-up table (LUT1) of the memory unit 135 in which the reference touch row data for each temperature is stored. can be extracted, and the temperature corresponding to the extracted reference touch raw data can be calculated as the predicted temperature (ET). Here, the reference touch raw data for each temperature is set to the first touch raw data generated through touch position sensing performed at each temperature between -40°C and 80°C through preliminary experiments. The temperature corresponding to the reference touch raw data is mapped to the first look-up table (LUT1).

The touch control circuit 133 according to an example generates force driving pulse information (FDPI) based on the calculated predicted temperature (ET) and provides it to the driving signal generator 131a of the sensing circuit 131. That is, the touch control circuit 133 dynamically adjusts the driving conditions of the second touch sensor TS2 according to the predicted temperature ET through a temperature compensation algorithm that changes the force driving pulse information (FDPI) for generating a force driving signal. Change to Here, the force driving signal (FDS) may have at least one driving pulse (P1 to Pn) having a high voltage section (H) and a low voltage section (L), as shown in FIG. 4. At this time, the force driving pulse information (FDPI) includes amplitude (or high voltage level of the pulse) information (AI), pulse width (or high voltage section) information (WI), and number of driving pulses information (AI) of the driving pulses (P1 to Pn). (PI) may be included. Accordingly, the touch control circuit 133 generates amplitude information (AI), width information (WI), and number information of the driving pulses (P1 to Pn) according to the predicted temperature (ET) calculated from the first touch raw data (TRD1). Force driving pulse information (FDPI) can be generated by changing at least one piece of information among (NI).

As an example, when the predicted temperature is room temperature (20°C), the touch control circuit 133 sets each of the amplitude information (AI), width information (WI), and number information (NI) of the driving pulses (P1 to Pn) to a reference value. Set to . When the predicted temperature (ET) is below room temperature (20°C), the touch driving circuit 130 provides at least one of amplitude information (AI), width information (WI), and number information (NI) of the driving pulses (P1 to Pn). Set it to a value between the standard value and the maximum value. When the predicted temperature (ET) exceeds room temperature, the touch driving circuit 130 uses at least one of the amplitude information (AI), width information (WI), and number information (NI) of the driving pulses (P1 to Pn) within the reference value. Set it to a value between the minimum values. Here, the maximum value can be set when the predicted temperature is approximately -40°C, and the minimum value can be set when the predicted temperature is approximately 80°C. As a result, the touch control circuit 133 generates force driving pulse information (FDPI) to increase the amount of current supplied to the second touch sensor TS2 as the predicted temperature (ET) becomes lower. The higher it is, the more the force driving pulse information (FDPI) is generated to reduce the amount of current supplied to the second touch sensor (TS2), and the driving conditions of the second touch sensor (TS2) are dynamically changed according to the predicted temperature (ET) to maintain the same The difference in resistance value change of the second touch sensor TS2 according to temperature is compensated for the touch force.

Optionally, the touch control circuit 133 according to an example simultaneously performs touch position sensing and touch force sensing and calculates the predicted temperature (ET) from the first touch raw data (TRD1) generated according to the touch position sensing. At the same time, the touch force level is calculated from the second touch raw data (TRD2) generated according to the touch force sensing, the temperature compensation coefficient is calculated based on the predicted temperature (ET) and the touch force level, and then the operation is performed according to the temperature compensation coefficient. Force driving pulse information (FDPI) can be generated by changing at least one of the amplitude information (AI), width information (WI), and number information (NI) of the pulses (P1 to Pn).

As shown in Table 1 below, the temperature compensation coefficient has a reference value of "1" when the predicted temperature (ET) is room temperature, and has a value greater than "1" when the predicted temperature (ET) is low based on room temperature. The lower the predicted temperature (ET), the larger the value. If the predicted temperature (ET) is high based on room temperature, the value is less than "1", but the higher the predicted temperature (ET), the smaller the value. It can have a value. At this time, the temperature compensation coefficient for predicted temperature (ET) exceeding room temperature has a larger value as the touch force level is lower, and the temperature compensation coefficient for predicted temperature (ET) below room temperature has a larger value as the touch force level has increased. You can have

[Table 1]

As such, the temperature compensation coefficient may be stored in the memory unit 135 to correspond to the predicted temperature (ET) and the touch force level. That is, the memory unit 135 includes a second look-up table (LUT2) in which the predicted temperature (ET) and the temperature compensation coefficient corresponding to the touch force level are mapped, as shown in Table 1. Accordingly, the touch control circuit 133 extracts a temperature compensation coefficient mapped to correspond to the predicted temperature (ET) and the touch force level from the second look-up table (LUT2) of the memory unit 135, and the extracted temperature Force driving pulse information (FDPI) is generated by changing at least one of the amplitude information (AI), width information (WI), and number information (NI) of the driving pulses (P1 to Pn) according to the compensation coefficient.

Additionally, the touch control circuit 133 according to an example may provide the calculated predicted temperature (ET) to at least one of the display driving circuit and the host control circuit 500 that drive the display panel 300. In this case, the display driving circuit produces afterimages, flicker, and cross due to changes in the driving characteristics of the thin film transistor provided in the display panel 300 according to the predicted temperature (ET) provided from the touch control circuit 133 of the touch driving circuit 130. A temperature compensation algorithm can be performed to compensate for image quality degradation such as torque. Additionally, the host control circuit 500 adjusts the heat generation of the display panel 300 based on the predicted temperature (ET) provided from the touch control circuit 133 of the touch driving circuit 130 to reduce the temperature of the electronic device. A temperature compensation algorithm can be performed to increase or decrease the temperature.

Meanwhile, the second touch sensor TS2 provided in the second touch sensing unit 113 maintains an initial resistance value due to fine contact between the force driving electrode (F_Tx) and the force sensing electrode (F_Rx) even when there is no touch. have it For example, the force driving electrode (F_Tx) may be placed on the force sensing electrode (F_Rx) with a resistor member and a predetermined air gap in between, but no touch occurs due to sagging of the force driving electrode (F_Tx) due to its own weight. Even when there is no touch, the force driving electrode (F_Tx) and the force sensing electrode (F_Rx) are in electrical contact, and because of this, the second touch sensor TS2 has an initial resistance value when there is no touch. As shown in FIG. 2 , the initial resistance value of the second touch sensor TS2 increases as the temperature of the second touch sensing unit 113 increases. The touch control circuit 133 can predict the temperature based on the change in the initial resistance value of the second touch sensor TS2 according to the temperature of the second touch sensing unit 113.

Specifically, the touch control circuit 133 according to an example receives second touch raw data TRD2 provided from the sensing unit 131, and calculates a predicted temperature based on the received second touch raw data TRD2. ET) is calculated. That is, the touch control circuit 133 may calculate the predicted temperature ET corresponding to the second touch raw data TRD2 based on the reference touch raw data for each temperature stored in the memory unit 135. For example, the touch control circuit 133 selects the reference touch corresponding to the second touch row data TRD2 from the first look-up table (LUT1) of the memory unit 135 where reference touch row data for each temperature is stored. Raw data can be extracted, and the temperature corresponding to the extracted reference touch raw data can be calculated as the predicted temperature (ET). Here, the reference touch raw data for each temperature is a second value for each temperature corresponding to the initial resistance value generated according to touch force sensing performed during no touch at each temperature between -40℃ and 80℃ through preliminary experiments. It is set as touch raw data.

The touch control circuit 133 according to an example changes force drive pulse information (FDPI) for generating a force drive signal based on the predicted temperature (ET) calculated based on the second touch raw data (TRD2). The driving conditions of the second touch sensor TS2 are dynamically changed through a temperature compensation algorithm. At this time, the touch control circuit 133, as in the above-described example, includes amplitude information (AI), width information (WI), and number information (NI) for the driving pulses (P1 to Pn) of the force driving signal (FDS). ) by changing at least one piece of information to generate force driving pulse information (FDPI).

The touch control circuit 133 according to an example generates touch low compensation data by reflecting temperature compensation data corresponding to the calculated predicted temperature (ET) in the second touch raw data, thereby reducing the temperature compensation of the second touch raw data according to temperature changes. Deviations can also be compensated.

The touch control circuit 133 according to an example may provide the calculated predicted temperature (ET) to at least one of the display driving circuit and the host control circuit 500. In this case, the display driving circuit may perform the temperature compensation algorithm described above. Additionally, the host control circuit 500 may perform the temperature compensation algorithm described above.

FIG. 5 is a perspective view showing an electronic device according to an example of the present application, and FIG. 6 is a schematic cross-sectional view taken along line II' shown in FIG. 5.

5 and 6, an electronic device according to an example includes a housing 700, a cover window 800, a display panel 300, a display driving circuit 400, a touch screen device 100, and a host control. Includes circuit 500.

The housing 700 accommodates the display panel 300 and the touch screen device 100. To this end, the housing 700 includes a bottom surface and a side wall provided perpendicular to an edge of the bottom surface, and a storage space is provided on the bottom surface surrounded by the side wall. Additionally, the housing may further include a system placement portion. For example, the system arrangement part may be provided on the rear of the housing so that a portion communicates with the storage space, and is covered by a separate rear cover. As another example, the system arrangement part may be provided between the bottom surface of the housing 700 and an intermediate frame disposed on the bottom surface of the housing 700.

The cover window 800 is installed on the side wall of the housing 700 to cover the storage space of the housing 700. At this time, a buffering member such as a foam pad may be additionally disposed between the side wall of the housing 700 and the cover window 800.

The display panel 300 may be an organic light emitting display panel that displays images using light emission from organic light emitting elements. At this time, the display panel 300 may have a flat shape, a curved shape, or a bent shape. The display panel 300 according to one example includes a pixel array substrate 310, a pixel array layer 330, an encapsulation layer 350, and a light control film 370.

The pixel array substrate 310 supports the pixel array layer 330 and includes a flexible material. For example, the pixel array substrate 310 may be made of a polyimide film, but is not limited thereto. Additionally, the rear surface of the pixel array substrate 310 may be combined with a back plate. The back plate is attached to the back of the pixel array substrate 310 with an optical adhesive, thereby maintaining the flexible pixel array substrate 310 in a flat state.

The pixel array layer 330 includes a plurality of pixels provided in each pixel area defined by the intersection of a plurality of gate lines and a plurality of data lines. Each of the plurality of pixels may include a switching transistor connected to the gate line and the data line, a driving transistor that receives a data signal from the switching transistor, and an organic light emitting element that emits light by the data current supplied from the driving transistor. The organic light-emitting device includes an anode electrode connected to a driving transistor, an organic light-emitting layer provided on the anode electrode, and a cathode electrode provided on the organic light-emitting layer.

The pixel array substrate 310 includes a panel pad portion provided at one edge, and the panel pad portion is provided at one edge portion of the pixel array substrate 310 together with the thin film transistor of the pixel.

Additionally, the electronic device according to this example further includes a scan driving circuit provided in the non-display area of the pixel array substrate 310. The scan driving circuit generates scan pulses according to the scan control signal provided from the display driving circuit 400 and supplies them to the gate lines corresponding to the set order. The scan driving circuit according to one example is provided in the non-display area of the pixel array substrate 310 along with the thin film transistor of the pixel.

The encapsulation layer 350 is provided on the entire upper surface of the pixel array substrate 310 to cover the pixel array layer 330. This encapsulation layer 350 serves to protect the organic light emitting device from oxygen or moisture.

The light control film 370 is disposed on the encapsulation layer 350 and covers the entire upper surface of the encapsulation layer 350. This light control film 370 increases the luminance characteristics of light emitted from each pixel. For example, the light control film 370 may be a polarizing film that polarizes the light emitted from each pixel, but is not limited thereto, and may be an optical film that can improve the luminance characteristics of the light emitted from each pixel.

Additionally, the display panel 300 according to one example may further include a barrier film interposed between the encapsulation layer 350 and the light control film 370. The barrier film may be formed by applying an inorganic insulating film on an organic insulating film. The barrier film is primarily intended to prevent moisture or oxygen from penetrating into each pixel, and may be made of a material with low moisture permeability.

As such, the display panel 300 may be attached to the rear of the cover window 800 using the transparent adhesive member 390. Here, the transparent adhesive member 390 may be optical clear adhesive (OCA) or optical clear resin (OCR).

The display driving circuit 400 displays an image on the display panel 300. The display driving circuit 400 may be a driving integrated circuit mounted on a chip mounting area provided on the pixel array substrate 310. The display driving circuit 400 is connected to a panel pad provided on the pixel array substrate 310, is connected one-to-one with a plurality of data lines, and is connected to a scan driving circuit. This display driving circuit 400 receives digital image data, timing synchronization signal, driving power, and cathode power provided from the host control circuit 500 through a flexible printed circuit cable and a panel pad unit. For example, the display driving circuit 400 sorts digital image data into pixel data for each pixel to correspond to the arrangement structure of a plurality of pixels provided in the display panel 300 according to the timing synchronization signal, and divides the pixel data for each pixel into pixel data. It is converted into a separate data signal and supplied to the corresponding pixel through the corresponding data line, and cathode power is supplied to the cathode electrode commonly connected to each pixel. At the same time, the display driving circuit 400 generates a scan control signal according to the timing synchronization signal and provides it to the scan driving circuit.

Optionally, the display driving circuit 400 may be mounted on a flexible printed circuit cable. In this case, the display driving circuit 400 receives digital image data, timing synchronization signal, driving power, and cathode power provided from the host control circuit 500 through a flexible printed circuit cable, and displays data for each pixel through the panel pad portion. A data signal is supplied to the corresponding data line, cathode power is supplied to the cathode electrode, and a scan control signal is supplied to the scan driving circuit.

The touch screen device 100 includes a touch screen 110 and a touch driving circuit 130.

The touch screen 110 is configured to sense each touch position and touch force by a touch input object. The touch screen 110 according to one example includes a first touch sensing unit 111 and a second touch sensing unit 113.

The first touch sensing unit 111 is for sensing the touch position of a touch input object touched on the cover window 800, and is disposed in front of the screen of the display panel 300 that displays an image or is positioned in front of the display panel 300. It can be provided inside. For example, the first touch sensing unit 111 may be disposed on the light control film 370 or may be interposed between the encapsulation layer 350 and the light control film 370.

The first touch sensing unit 111 according to an example includes a plurality of first touch sensors whose mutual capacitance or self-capacitance changes depending on the touch. As an example, the mutual capacitance of each of the plurality of first touch sensors is formed between the touch driving electrode and the touch sensing electrode, and may be reduced when a touch input object is touched. As another example, the self-capacitance of each of the plurality of first touch sensors is formed between the touch electrode and the touch input object, and may increase when the touch input object is touched.

The second touch sensing unit 113 is used to sense the touch force level of the touch input object on the cover window 800. As an example, the second touch sensing unit 113 may be interposed between the display panel 300 and the bottom surface of the housing 700. In this case, the heat of the display panel 300 is divided into a heat radiation method and a heat transfer method. Accordingly, it may serve to dissipate heat by transferring it to the housing 700. As another example, the second touch sensing unit 113 may be placed on the front of the first touch sensing unit 111. In this case, the second touch sensing unit 113 may be located relatively close to the touch surface of the touch input object, thereby Since it is possible to respond more easily to touch, the sensitivity of force touch sensing can be improved.

As shown in FIG. 7, the second touch sensing unit 113 according to an example includes a first substrate 113a, a second substrate 113b, a resistor member 113c, and a substrate bonding member 113d. Includes.

The first substrate 113a may be made of a transparent plastic material, for example, PET (polyethyleneterephthalate). This first substrate 113a includes a plurality of force sensing electrodes (F_Rx).

Each of the plurality of force sensing electrodes (F_Rx) is parallel to the first direction (X) of the first substrate 113a and is arranged at regular intervals along a second direction (Y) that intersects the first direction (X). It may be provided in (bar) form. Each of these force sensing electrodes (F_Rx) is connected to the touch driving circuit 130 through a plurality of second force routing lines.

The second substrate 113b may be made of the same transparent plastic material as the first substrate 113a, for example, PET material. This second substrate 113b includes a plurality of force driving electrodes (F_Tx).

Each of the plurality of force driving lines (F_Tx) is provided on the rear surface of the second substrate 113b to intersect each of the plurality of force sensing electrodes (F_Rx). Each of the plurality of force driving electrodes (F_Tx) may be provided in a bar shape so as to be parallel to the second direction (Y) of the first substrate 113a and at regular intervals along the first direction (X). Each of these plurality of force driving electrodes (F_Tx) is connected to the touch driving circuit 130 through a plurality of first force routing lines.

The resistor member 113c is provided at the intersection of the force driving electrode (F_Tx) and the force sensing electrode (F_Rx). This resistive member 113c forms a second touch sensor TS2, that is, a resistance, at a contact portion between the force driving electrode F_Tx and the force sensing electrode F_Rx according to the force touch of the touch input object. The second touch sensor TS2 is connected to the contact area between the force driving electrode F_Tx and the force sensing electrode F_Rx, which are in contact with the resistor member 113c according to the force touch of the touch input object on the second substrate 113b. The resistance value changes accordingly so that the force touch of the touch input object can be sensed.

The resistor member 113c according to one example may be provided on the upper surface of the first substrate 113a to cover the plurality of force sensing electrodes (F_Rx). The resistor member 113c according to an example may be provided on the rear surface of the second substrate 113b facing the first substrate 113a to cover the plurality of force driving electrodes F_Tx. This resistive member 113c is made of a single body and is therefore suitable for sensing a single force touch.

The resistor member 113c according to one example may include a plurality of first resistor patterns 113c1 and a plurality of second resistor patterns 113c2. Each of the plurality of first resistor patterns 113c1 may be provided on the upper surface of the first substrate 113a to cover each of the plurality of force sensing electrodes F_Rx one-to-one. That is, one first resistor pattern 113c1 is patterned on the upper surface of the first substrate 113a to cover one force sensing electrode (F_Rx). The plurality of second resistor patterns 113c2 may be provided on the rear surface of the second substrate 113b to cover each of the plurality of force driving electrodes (F_Tx) on a one-to-one basis. That is, one second resistor pattern 113c2 is patterned on the rear surface of the second substrate 113b to cover one force driving electrode (F_Tx). This resistive member 113c is suitable for sensing a multi-force touch because the plurality of first resistive patterns 113c1 are separated from each other and the plurality of second resistive patterns 113c2 are separated from each other.

The resistor member 113c according to one example is a pressure-sensitive adhesive material based on any one of quantum tunneling composites (QTC), electro-active polymer (EAP), acrylic, and rubber-based solvent. , or may be made of a piezo-resistive series material. Here, the pressure-sensitive adhesive material has a characteristic of varying resistance depending on pressure. In addition, the piezoresistive series of materials has a piezoresistive effect in which conduction energy is generated when an external force is applied to a silicon semiconductor crystal and the resistivity changes as the charge moves to the conduction band. The characteristic is that the resistivity changes significantly depending on the size of the pressure. has This resistor member 113c is coated on the first substrate 113a and/or the second substrate 113b by a printing process, or is coated on the first substrate 113a and/or the second substrate 113b by an attachment process using an adhesive. ) can be attached to.

The substrate bonding member 113d connects the first substrate 113a and the second substrate 113b so that a gap space GS (or air gap) is provided between the first substrate 113a and the second substrate 113b. Cement the opposing sides. For example, the substrate bonding member 113d may be an adhesive having a cushion material. This substrate bonding member 113d functions as a support to support the first substrate 113a and the second substrate 113b across the gap space GS.

As shown in FIG. 8, the second touch sensing unit 113 according to an example has the second resistor member pattern 113c2 change to the first according to the touch force (FT) applied by the touch input object. It comes into physical contact with the resistive member pattern 113c1, and as a result, resistance occurs in the resistive member 113c between the force driving electrode (F_Tx) and the force sensing electrode (F_Rx) that cross each other, that is, the second touch sensor (TS2). is formed, and the current according to the force driving signal supplied to the force driving electrode (F_Tx) flows through this resistance to the corresponding force sensing electrode (F_Rx). Accordingly, the touch driving circuit 130 amplifies the voltage corresponding to the current flowing in the second touch sensor TS2 to generate second touch row data, and generates touch force level data based on the second touch row data. do.

Meanwhile, the second touch sensing unit 113 operates force even when there is no touch due to the sagging of the second substrate 113b according to the weight of the second substrate 113b and the weight of the display panel 300. As described above, a fine contact is made between the electrode F_Tx and the force sensing electrode F_Rx, so that the second touch sensor TS2 has an initial resistance value even when there is no touch.

The touch driving circuit 130 is electrically connected to each of the first touch sensing unit 111 and the second touch sensing unit 113 of the touch screen 110, and detects the touch of the touch input object on the cover window 800. It senses each location and touch force. Since this touch driving circuit 130 has the same structure and the same operation as the touch driving circuit 130 shown in FIGS. 1 to 4, duplicate description thereof will be omitted.

Referring again to FIGS. 5 and 6 , the host control circuit 500 may be an application processor of an electronic device. This host control circuit 500 receives 3D touch information (TI) output from the touch driving circuit 130 and executes an application corresponding to the received 3D touch information (TI). Additionally, the host control circuit 500 may perform a temperature compensation algorithm to reduce or increase the temperature of the electronic device based on the predicted temperature provided from the touch driving circuit 130.

Additionally, the display driving circuit 400 detects afterimages, flicker, and cross due to changes in driving characteristics of the thin film transistor provided in the display panel 300 according to the predicted temperature provided from the touch control circuit 133 of the touch driving circuit 130. A temperature compensation algorithm can be performed to compensate for image quality degradation such as torque. For example, the display driving circuit 400 may control heat generation of the display panel 300 by adjusting the brightness of the display panel 300 according to the predicted temperature.

As such, the electronic device according to this example changes the operating conditions of touch force sensing according to the predicted temperature calculated based on touch raw data to compensate for the deviation of touch force sensing depending on temperature for the same touch force, thereby changing the touch force level. can be sensed more accurately, and a temperature compensation algorithm can be run to prevent image quality deterioration due to changes in temperature environment based on the predicted temperature without having a separate temperature sensor.

9A and 9B are diagrams showing the touch force level according to the touch force in the room temperature and low temperature environments of the touch screen device in the comparative example and the present example.

First, as can be seen in FIG. 9A, the touch screen device of the comparative example shows a deviation between the touch force level (G1) according to the touch force in a room temperature environment and the touch force level (G2) according to the touch force in a low temperature environment. there is. Accordingly, the accuracy of force sensing of the touch screen device of the comparative example may be reduced due to a change in the resistance value of the second touch sensor due to temperature change.

On the other hand, as can be seen in FIG. 9B, it can be confirmed that the touch force level (G1) according to the touch force in the room temperature environment and the touch force level (G2) according to the touch force in the low temperature environment of the touch screen device of this example are similar. For this reason, in this example, the performance of force touch sensing can be improved despite temperature changes by dynamically changing the driving conditions of the second touch sensing unit according to a temperature compensation algorithm using the predicted temperature calculated based on touch raw data.

Meanwhile, in Figure 5, a smart phone is shown as an electronic device according to the present application, but it is not limited thereto, and the electronic device according to the present application includes an electronic notebook, an e-book, a portable multimedia player (PMP), navigation, and a mobile device. Portable electronic devices such as phones, personal computers (tablet PCs), smart watches, watch phones, wearable devices, and mobile communication terminals, televisions, laptops, monitors, cameras, camcorders, Alternatively, it can be applied to home appliances having a display, etc.

The present application described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which this application belongs that various substitutions, modifications, and changes are possible without departing from the technical details of the present application. It will be clear to those who have the knowledge of. Therefore, the scope of the present application is indicated by the claims described later, and the meaning and scope of the claims and all changes or modified forms derived from the equivalent concept should be interpreted as being included in the scope of the present application.

110: touch screen 111: first touch sensing unit
113: second touch sensing unit 130: touch driving circuit
131: sensing unit 133: touch control circuit
135: memory unit 300: display panel
400: display driving circuit 500: host control circuit
700: Housing 800: Cover Window

Claims (14)

a touch screen with a touch sensor; and
It includes a touch driving circuit connected to the touch screen,
The touch driving circuit generates touch raw data by sensing electrical changes in the touch sensor and calculates a predicted temperature based on the touch raw data,
The touch driving circuit generates the touch raw data by sensing a change in resistance value of the touch sensor while supplying a force driving signal to the touch sensor in a no touch section, and predicts the temperature based on the touch raw data. Calculate ,
The touch screen is,
a first touch sensing unit having a first touch sensor; and
It includes a second touch sensing unit having a second touch sensor and overlapping with the first touch sensing unit,
The touch driving circuit generates the touch raw data by sensing a change in resistance value of the second touch sensor and calculates the predicted temperature based on the touch raw data,
The second touch sensor is a touch screen device in which the force driving electrode and the force sensing electrode are in electrical contact in the no-touch section and have an initial resistance value. According to claim 1,
The touch driving circuit generates the touch raw data by sensing a change in capacitance of the touch sensor. According to claim 1,
It further includes a memory unit in which standard touch raw data for each temperature is stored,
The touch driving circuit calculates the predicted temperature from the temperature corresponding to the touch raw data from the reference touch raw data for each temperature stored in the memory unit. According to claim 1,
The touch driving circuit generates the touch raw data by sensing a change in resistance value of the touch sensor while supplying a force driving signal to the touch sensor, and calculates a predicted temperature based on the touch raw data. delete According to claim 1,
The touch driving circuit changes the pulse shape of the force driving signal based on the predicted temperature and supplies it to the touch sensor while sensing a change in resistance value of the touch sensor. delete According to claim 1,
It further includes a memory unit storing touch raw data for each temperature,
The touch driving circuit calculates the predicted temperature from the temperature corresponding to the touch raw data from the touch raw data for each temperature stored in the memory unit. delete delete According to claim 1,
The force drive signal has at least one drive pulse,
The pulse information includes amplitude information and pulse width information of the driving pulse and number information of the driving pulse,
The touch driving circuit generates the pulse information by changing at least one of amplitude information, width information, and number information of the driving pulse according to the predicted temperature. display panel;
a display driving circuit connected to the display panel;
The touch screen device of any one of claims 1 to 4, 6, 8, and 11 overlapping the display panel; and
An electronic device comprising a host control circuit that controls each of the display driving circuit and the touch screen device. According to claim 12,
The touch driving circuit of the touch screen device supplies the predicted temperature to at least one of the display driving circuit and the host control circuit. According to claim 13,
The display driving circuit controls heat generation of the display panel based on the predicted temperature.

Images