KR101666579B1 - Touch panel display device and method for driving the same - Google Patents

Abstract

The present invention relates to a touch panel display device and a method of driving the same that can prevent the size of sensor data from being changed due to a temperature change. The touch panel display device is formed on a touch panel and generates a photocurrent based on a change in the amount of light incident from the outside A plurality of sensor transistors; A driving voltage transmission line for transmitting the driving voltage required for the sensor transistors to generate photocurrent to the sensor transistors; An analog-to-digital converter converting an optical voltage corresponding to a photocurrent from each sensor transistor into sensor data, which is a digital signal; And a controller that compares each of the sensor data from the analog-to-digital converter with a predetermined reference value and adjusts a driving voltage applied to the driving voltage transmission line in accordance with the number of sensor data exceeding the reference value And a control unit.

Display device, drive voltage, sensor data, touch panel

Description

TECHNICAL FIELD [0001] The present invention relates to a touch panel display device and a method of driving the touch panel display device.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel display, and more particularly, to a touch panel display device and a method of driving the same that can prevent the size of sensor data from changing due to a temperature change.

Recently, a technique of incorporating a touch sensor portion in a display panel has been proposed. The touch sensor unit generally refers to a user interface that is formed in the display panel and senses a touch point at which a change in electrical characteristics occurs at a touch point that is in contact with an opaque object such as a finger or a pen.

For this purpose, a sensor transistor, a sensor capacitor, and a switch transistor are formed in the touch sensor unit. The threshold voltage values of the sensor transistor and the switch transistor in the touch sensor unit change according to a change in the external environment, There has been a problem that the size of the sensor data to be outputted is not kept constant but greatly changed.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a touch screen panel which senses a change in size of sensor data according to a temperature change of a touch screen panel, The present invention also provides a touch sensor display apparatus and a method of driving the same that can maintain a constant size of sensor data output from a touch sensor.

According to an aspect of the present invention, there is provided a touch sensor display device including: a plurality of sensor transistors formed on a touch panel and generating a photocurrent based on a change in an amount of light incident from the outside; A driving voltage transmission line for transmitting the driving voltage required for the sensor transistors to generate photocurrent to the sensor transistors; An analog-to-digital converter converting an optical voltage corresponding to a photocurrent from each sensor transistor into sensor data, which is a digital signal; And a controller that compares each of the sensor data from the analog-to-digital converter with a predetermined reference value and adjusts a driving voltage applied to the driving voltage transmission line in accordance with the number of sensor data exceeding the reference value And a control unit.

The drive voltage regulator stores sensor data from the analog-to-digital converter, compares each of the stored sensor data with a preset reference value to determine the number of sensor data exceeding the reference value, A data number determination unit for selecting any one of the first and second adjustment signals based on the first and second adjustment signals; And a voltage regulator for changing the magnitude of the driving voltage based on the first and second adjustment signals from the data determination unit.

The data count determination unit may include: a storage unit for storing sensor data from the analog-to-digital conversion unit; And comparing the sensor data stored in the storage unit with a preset reference value to determine the number of sensor data exceeding the reference value, and selecting any one of the first and second adjustment signals based on the determination result And an arithmetic processing unit for outputting the arithmetic operation result.

The voltage regulator includes a first transistor whose resistance value is controlled according to one of first and second control signals from the arithmetic processing unit and is connected between a first node and one side of a first resistor; A ground terminal connected to the other side of the first resistor; A capacitor connected between the ground terminal and a second node; A second resistor connected between the first node and the second node; And a third resistor connected between the first node and the driving voltage transmission line; In addition, each one of the sensor transistors is connected to the second node.

The operation processing unit selects and outputs the first adjustment signal when the number of sensor data exceeding the reference value exceeds 5% of the total number of sensor data, while the number of sensor data exceeding the reference value is greater than the total number of sensor data And when it is less than 1%, selects and outputs the second adjustment signal.

Wherein the voltage regulator decreases the magnitude of the drive voltage in response to the first adjustment signal of the processor rotor while increasing the magnitude of the drive voltage in response to the second adjustment signal from the operation processor. do.

According to another aspect of the present invention, there is provided a method of driving a touch sensor display device including a plurality of sensor transistors formed on a touch panel and generating a photocurrent based on a change in an amount of light incident from the outside; A driving voltage transmission line for transmitting the driving voltage required for the sensor transistors to generate photocurrent to the sensor transistors; And an analog-to-digital converter for converting a light voltage corresponding to a photocurrent from each sensor transistor into sensor data, which is a digital signal, the method comprising: sensing the sensor data from the analog- And adjusting the magnitude of the driving voltage applied to the driving voltage transmission line according to the number of sensor data exceeding the reference value.

The step of adjusting the magnitude of the driving voltage may include storing the sensor data from the analog-to-digital converter, comparing each of the stored sensor data with a preset reference value to determine the number of sensor data exceeding the reference value Selecting one of the first and second adjustment signals based on the determination result, and outputting the selected one; And changing the magnitude of the driving voltage based on the first and second adjustment signals.

When the number of sensor data exceeding the reference value exceeds 5% of the total number of sensor data, the first adjustment signal is selected and output. On the other hand, if the number of sensor data exceeding the reference value is less than 1% And the second adjustment signal is selected and output.

The magnitude of the driving voltage is decreased when the first adjusting signal is selected, while the magnitude of the driving voltage is increased when the second adjusting signal is selected.

According to the present invention, the size of the sensor data is changed according to the temperature change of the touch sensor display device, and the magnitude of the drive voltage is changed based on the sensed result, thereby keeping the size of the sensor data output from the lead- .

FIG. 1 is a diagram illustrating a touch sensor display apparatus according to an embodiment of the present invention, and FIG. 2 is a detailed configuration diagram of one pixel in FIG.

The touch sensor display apparatus according to the present invention includes a touch panel (PN) having a plurality of pixels (PXL) arranged in a matrix form as shown in FIG.

Each pixel PXL includes an image display portion (ID) for displaying an image and a touch sensor portion (TS) for recognizing a touch to the touch panel (PN), as shown in Fig.

The image display unit ID includes a pixel transistor TrP for supplying image data from the data line to the pixel PXL electrode in response to a scan pulse from the gate line and a pixel transistor TrP formed between the pixel PXL electrode and the common electrode (DVL) and a pixel (PXL) electrode in order to stably maintain the image data stored in the liquid crystal capacitance capacitor (Clc) for the next frame period, a liquid crystal capacitor Clc for storing the image data, And an auxiliary capacity capacitor Cst formed in the auxiliary capacitor Cst.

The touch sensor unit TS includes a sensor transistor TrS that generates a photocurrent i differently according to a change in the quantity of light incident from the outside, a sensor capacitor Cst2 that stores charges by the photocurrent i, And a switch transistor TrW for switching the output of the charges stored in the switch transistor TrW. The gate electrode of the sensor transistor TrS is connected to the drive voltage transmission line DVL, the source electrode thereof is connected to the source electrode of the switch transistor TrW, and the drain electrode thereof is connected to the drive voltage transmission line DVL. The gate electrode of the switch transistor TrW is connected to the previous-stage gate line, the source electrode thereof is connected to the source electrode of the sensor transistor TrS, and the drain electrode thereof is connected to the lead-out line RL. One electrode of the sensor capacitor Cst2 is connected to the driving voltage transmission line DVL and the other electrode is connected to the source electrode of the switch transistor TrW.

The driving voltage is a driving voltage required for the sensor transistors TrS to generate a photocurrent, and the driving voltage is supplied to the sensor transistors TrS through the driving voltage transmission line DVL.

The touch sensor unit TS having the above-described configuration may be formed for each pixel PXL or may be formed for every k (k is a natural number of 2 or more) pixels PXL. At this time, as shown in FIG. 1, the touch sensor units TS arranged along the longitudinal direction of the touch panel PN are commonly connected to one lead-out line RL. All the touch sensor units TS formed on the touch panel PN are commonly connected to one drive voltage transmission line DVL.

The touch sensor units TS arranged in the horizontal direction of the touch panel PN are commonly connected to one front gate line GLn-1, while the touch sensor units TS arranged in the horizontal direction of the touch panel PN TS are independently connected to the different gate lines GLn, GLn-1. Since the scan lines are sequentially supplied to the gate lines, all of the touch sensor units TS arranged in the horizontal direction are simultaneously driven while the touch sensor units TS arranged in the vertical direction are sequentially driven.

The touch sensor units TS arranged in the vertical direction are connected to one current-voltage conversion unit AMP and one analog-digital conversion unit ADC via one lead-out line RL. All analog-to-digital converters (ADCs) are commonly connected to one driving voltage regulator.

One current-to-voltage converter (AMP) converts the photo-currents sequentially supplied from the respective switching transistors provided in the plurality of touch sensor units (TS) arranged in the longitudinal direction into light voltages. The current-voltage converter AMP converts a photocurrent into an optical voltage using a reference voltage supplied to the current-voltage converter AMP. The current-voltage converter AMP uses an OP-AMP (Operational Amplifier) .

One analog-to-digital converter (ADC) converts optical voltages sequentially supplied from the current-voltage converter (AMP) into sensor data, which is a digital signal.

The driving voltage regulator (DVC) compares each sensor data from each analog-to-digital converter (ADC) with a preset reference value, and outputs the driving voltage transmission line (DVL) according to the number of sensor data exceeding the reference value. Thereby adjusting the magnitude of the driving voltage applied to the pixel electrode.

Here, the driving voltage control unit (DVC) will be described in detail as follows.

3 is a detailed block diagram of the driving voltage regulator (DVC) of FIG.

The driving voltage regulator DVC includes a data count determination unit DND and a voltage regulator VA as shown in FIG. The data number determination unit DND stores the sensor data DA from each analog-to-digital converter ADC and compares each of the stored sensor data DA with a predetermined reference value, Determines the number of data DA, and selects and outputs one of the first and second adjustment signals based on the determination result. The voltage regulator VA changes the magnitude of the drive voltage Vdr of the drive voltage transmission line DVL based on the first and second adjustment signals from the data determination unit.

The data number determination unit DND includes a storage unit M and an operation processing unit CP.

The storage unit M stores sensor data DA from all analog-to-digital converters (ADCs).

The operation processing unit CP compares each of the sensor data DA stored in the storage unit M with preset reference values to determine the number of sensor data DA exceeding the reference value, 1 and the second adjustment signals. When the number of sensor data DA exceeding the reference value exceeds 5% of the total number of sensor data DA, the arithmetic processing unit CP selects and outputs the first adjustment signal. On the other hand, And selects and outputs the second adjustment signal when the number of sensor data DA is less than 1% of the total number of sensor data DA. If the number of sensor data DA exceeding the reference value is 2% to 4% of the total number of sensor data DA, the arithmetic processing unit CP does not output any signal.

Here, the voltage regulator VA will be described in detail as follows.

4 is a detailed configuration diagram of the voltage regulator VA of FIG.

4, the voltage regulator VA includes a voltage regulating transistor TrA, a first resistor R1, a ground terminal GND, a capacitor C2, a second resistor R2 and a third resistor R3. And a resistor R3.

The voltage regulating transistor TrA is controlled in accordance with any one of the first and second adjusting signals from the arithmetic processing unit CP and is connected between the first node n1 and one side of the first resistor R1 do.

The ground terminal GND is connected to the other side of the first resistor R1.

The capacitor C is connected between the ground terminal GND and the second node n2.

The second resistor R2 is connected between the first node n1 and the second node n2. In addition, one electrode of each of the sensor transistors TrS is commonly connected to the second node n2.

A third resistor R3 is connected between the first node n1 and the driving voltage transmission line DVL.

The voltage regulator VA reduces the magnitude of the driving voltage Vdr in response to the first regulating signal of the rotor of the processor CP while the voltage regulator VA responds to the second regulating signal Thereby increasing the magnitude of the driving voltage Vdr.

The operation processing unit CP outputs the first and second adjustment signals in a PWM (Pulse Width Modulation) manner, and the first and second adjustment signals have different frequencies. Specifically, the first adjustment signal has a higher frequency than the second adjustment signal. When the first adjustment signal is supplied to the gate electrode of the voltage adjustment transistor TrA, the ON / OFF state of the voltage adjustment transistor TrA The internal resistance of the voltage regulating transistor TrA is reduced. Then, the magnitude of the driving voltage Vdr of the driving voltage transmission line DVL becomes smaller than the original magnitude. On the other hand, when a second adjustment signal having a lower frequency than the first adjustment signal is supplied to the gate electrode of the voltage adjustment transistor TrA, the ON / OFF operation of the voltage adjustment transistor TrA is slow, Is increased. Then, the magnitude of the driving voltage Vdr of the driving voltage transmission line DVL becomes larger than the original magnitude.

On the other hand, if none of the first and second control signals are supplied to the gate electrode of the voltage regulating transistor TrA, the driving voltage Vdr of the driving voltage transmission line DVL may have an original magnitude .

5 is a diagram showing the number of sensor data DA exceeding the reference value and the number of sensor data DA below the reference value, and as shown in FIG. 5, the number of sensor data DA exceeding the reference value is When the number of sensor data DA exceeding the reference value is greater than 5% of the total number of sensor data DA, the operation processing unit CP selects and outputs the first adjustment signal, If it is less than 1% of the number, the arithmetic processing unit CP selects and outputs the second adjustment signal.

6 is a view for explaining an effect of the touch sensor display device according to the present invention.

As shown in FIG. 6, the size of the sensor data DA output from the lead-out line RL of the conventional touch sensor display device decreases slightly after the heating point at which the temperature greatly changes. However, the size of the sensor data DA output from the lead-out line RL of the touch sensor display device according to the present invention does not substantially change even after the heating time.

As described above, according to the present invention, the change in the size of the sensor data DA according to the temperature change of the touch sensor display device is detected, and the magnitude of the driving voltage Vdr is changed based on the sensed result, The size of the sensor data DA outputted from the sensor can be kept constant.

Meanwhile, the touch panel (PN) according to the present invention is an in-cell photo type, and the driving voltage controller (DVC) according to the present invention can be applied to all known touch panels in addition to the in-cell photo method. For example, the driving voltage controller (DVC) of the present invention can be applied to a capacitive touch panel called an In cell pressed capacitive method.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. It will be clear to those who have knowledge of.

1 is a view illustrating a touch sensor display apparatus according to an embodiment of the present invention.

Fig. 2 is a detailed configuration diagram of one pixel in Fig. 1

3 is a detailed configuration diagram of the driving voltage adjusting unit of FIG.

Fig. 4 is a detailed configuration diagram of the voltage regulating device of Fig. 3

5 is a diagram showing the number of sensor data exceeding the reference value and the number of sensor data less than the reference value

6 is a view for explaining an effect of the touch sensor display device according to the present invention.

Claims (10)

A plurality of sensor transistors formed on the touch panel and generating photocurrent based on changes in the amount of light incident from the outside; A driving voltage transmission line for transmitting the driving voltage required for the sensor transistors to generate photocurrent to the sensor transistors; An analog-to-digital converter converting an optical voltage corresponding to a photocurrent from each sensor transistor into sensor data, which is a digital signal; And A driving voltage regulator for comparing each sensor data from the analog-to-digital converter with a predetermined reference value and adjusting a magnitude of a driving voltage applied to the driving voltage transmission line according to the number of sensor data exceeding the reference value, Comprising a touch sensor display. The method according to claim 1, The driving voltage regulator includes: The sensor data from the analog-to-digital converter is stored, the stored sensor data is compared with a preset reference value to determine the number of sensor data exceeding the reference value, and based on the determination result, 2 control signals for selecting one of the control signals; And And a voltage regulator for changing the magnitude of the driving voltage based on the first and second adjustment signals from the data number determination unit. 3. The method of claim 2, Wherein the data number determination unit comprises: A storage unit for storing sensor data from the analog-to-digital converter; And The control unit compares each of the sensor data stored in the storage unit with a predetermined reference value to determine the number of sensor data exceeding the reference value, and selects any one of the first and second adjustment signals based on the determination result, The touch sensor device comprising: The method of claim 3, The voltage regulating device includes: A voltage regulating transistor whose resistance value is controlled according to any one of the first and second adjusting signals from the arithmetic processing unit and connected between the first node and one side of the first resistor; A ground terminal connected to the other side of the first resistor; A capacitor connected between the ground terminal and a second node; A second resistor connected between the first node and the second node; And And a third resistor connected between the first node and the drive voltage transmission line; And,  And one electrode of each of the sensor transistors is commonly connected to the second node. The method of claim 3, The operation processing unit selects and outputs the first adjustment signal when the number of sensor data exceeding the reference value exceeds 5% of the total number of sensor data, while the number of sensor data exceeding the reference value is greater than the total number of sensor data And when it is less than 1%, selects and outputs the second adjustment signal. 6. The method of claim 5, Wherein the voltage control device decreases the magnitude of the driving voltage in response to the first adjusting signal of the rotor of the arithmetic processing unit and increases the magnitude of the driving voltage in response to the second adjusting signal from the arithmetic processing unit, Device. A plurality of sensor transistors formed on the touch screen panel and generating photocurrent based on changes in the amount of light incident from the outside; A driving voltage transmission line for transmitting the driving voltage required for the sensor transistors to generate photocurrent to the sensor transistors; And an analog-to-digital converter converting the optical voltage corresponding to the photocurrent from each sensor transistor into sensor data, which is a digital signal, Comparing each of the sensor data from the analog-to-digital converter with a preset reference value, and adjusting the magnitude of the driving voltage applied to the driving voltage transmission line in accordance with the number of sensor data exceeding the reference value A method of driving a touch sensor display device. 8. The method of claim 7, Wherein the step of adjusting the magnitude of the driving voltage comprises: The sensor data from the analog-to-digital converter is stored, the stored sensor data is compared with a preset reference value to determine the number of sensor data exceeding the reference value, and based on the determination result, Selecting and outputting one of the two adjustment signals; And And changing a magnitude of the driving voltage based on the first and second adjustment signals. 9. The method of claim 8, When the number of sensor data exceeding the reference value exceeds 5% of the total number of sensor data, the first adjustment signal is selected and output. On the other hand, if the number of sensor data exceeding the reference value is less than 1% And selecting and outputting the second adjustment signal. 10. The method of claim 9, Wherein when the first adjustment signal is selected, the magnitude of the driving voltage is decreased, whereas when the second adjustment signal is selected, the magnitude of the driving voltage is increased.

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