KR20210081786A - Display Device - Google Patents

Abstract

The present invention relates to a display device capable of performing touch sensing and view angle adjustment, which is intended to increase touch sensing accuracy by removing interference between a driving signal of a view angle control panel and a touch sensing signal. A display device in accordance with an embodiment of the present invention comprises: a panel; and a driving circuit transmitting a signal to the panel. The panel includes: a display panel including a plurality of pixels and a plurality of touch electrodes; and a view angle adjustment panel for adjusting a view angle of light. The driving circuit includes: a touch detection circuit outputting a touch driving signal to the plurality of touch electrodes; a view angle driving circuit outputting a view angle driving signal to the view angle control panel; and a timing control circuit outputting a control signal to the touch detection circuit and the view angle driving circuit. The timing control circuit performs a control operation such that the touch detection circuit is driven for a first period, and the view angle driving circuit allows a voltage output to the view angle adjustment panel, to be changed for a second period.

Description

Display Device {Display Device}

The present invention relates to a display device capable of touch sensing and viewing angle control, and is intended to improve touch sensing accuracy by removing interference between a driving signal of a viewing angle control panel and a touch sensing signal.

As a display device of a mobile electronic device or an information terminal, a touch screen, which is a display device in which a touch panel is attached to a display panel, is receiving attention.

The touch screen is used as an output means for displaying an image and as a means for receiving a user's command by touching a specific part of the displayed image.

Such a touch screen may be manufactured in a form in which a separate touch panel is attached to the display panel (add on type), or the touch panel is formed on a substrate of the display panel to be integrated (in-cell type).

In addition, due to the development of technology, the screen of the electronic device including the display device can clearly view the image from any angle. When providing an image to users, the electronic device may check the image with a wider viewing angle. However, an electronic device providing a screen with a wide viewing angle may be difficult to protect privacy in public places.

In particular, users of mobile electronic devices or information terminals such as mobile phones, personal digital assistants (hereinafter referred to as "PDA") and computers are prevented from accessing information by others except themselves while using the device to protect their privacy. is demanding

In response to such a request, a display device that supports not only a normal viewing angle mode but also a narrow viewing angle mode to prevent information reading has been developed.

The above-mentioned background art is technical information possessed by the inventor for derivation of the present invention or acquired in the process of derivation of the present invention, and cannot necessarily be said to be a known technique disclosed to the general public prior to filing of the present invention.

The present invention relates to a display device in which a viewing angle can be adjusted and a touch electrode is embedded in a display panel, and it is a technical task to reduce a touch error (ghost tocuh).

Another object of the present invention is to eliminate interference between a driving signal of a viewing angle control panel and a touch sensing signal.

As a means for solving the above problems, the present disclosure has various embodiments having the following characteristics.

A display device according to a first embodiment of the present disclosure includes a panel; and a driving circuit transmitting a signal to the panel, wherein the panel includes: a display panel including a plurality of pixels and a plurality of touch electrodes; and a viewing angle control panel for adjusting a viewing angle of light, wherein the driving circuit includes: a touch detection circuit outputting a touch driving signal to the plurality of touch electrodes; a viewing angle driving circuit for outputting a viewing angle driving signal to the viewing angle control panel; and a timing control circuit for outputting a control signal to the touch detection circuit and the viewing angle driving circuit, wherein the timing control circuit causes the touch detection circuit to drive for a first period, and the viewing angle driving circuit to the viewing angle adjustment panel It is characterized in that the output voltage is controlled to be changed during the second period.

The driving circuit may include a display driver driving the pixels of the display panel, and the timing control circuit may control the display driver to be driven during the second period.

The viewing angle driving circuit is characterized in that it outputs a square wave voltage.

The viewing angle control panel includes a light diffusion control layer that scatters and diffuses light or maintains the straightness of the light, and the light diffusion control layer includes a first electrode and a second electrode.

The display device may further include a backlight unit emitting light to a rear surface of the panel, wherein the viewing angle control panel is disposed between the display panel and the backlight unit, and controls a viewing angle of light emitted by the backlight unit do it with

A display device according to a second embodiment of the present disclosure includes a panel; and a driving circuit transmitting a signal to the panel, wherein the panel includes: a display panel including a plurality of pixels and a plurality of touch electrodes; and a viewing angle control panel for controlling a viewing angle of light, wherein the viewing angle control panel includes a light diffusion control layer that scatters and diffuses light or maintains the straightness of light, wherein the light diffusion control layer includes a first electrode and a first electrode; and two electrodes, wherein the driving circuit floats the first electrode and the second electrode for a first period, and applies a square wave voltage between the first electrode and the second electrode for a second period. characterized.

The driving circuit may ground the first electrode and the second electrode in a predetermined period included in the second period, and the first period may be immediately after the predetermined period.

The driving circuit may include a touch detection circuit outputting a touch driving signal to the plurality of touch electrodes; a viewing angle driving circuit for outputting a viewing angle driving signal to the viewing angle control panel; and a timing control circuit that outputs a control signal to the touch detection circuit and the viewing angle driving circuit, wherein the timing control circuit controls the touch detection circuit to be driven during the first period.

The light diffusion control layer may further include a polymer dispersed liquid crystal (PDLC) layer disposed between the first electrode and the second electrode.

The display device may further include a backlight unit emitting light to a rear surface of the panel, wherein the viewing angle control panel is disposed between the display panel and the backlight unit, and controls a viewing angle of light emitted by the backlight unit do it with

The viewing angle control panel may further include a light diffusion suppressing layer that transmits the light emitted from the backlight unit by providing straightness.

A method of driving a display device according to a first embodiment of the present disclosure includes: a display panel including a plurality of touch electrodes; and a viewing angle control panel for adjusting a viewing angle of light, wherein the touch driving of the display panel is performed during a first period, and the voltage output to the viewing angle adjustment panel is changed during a second period characterized in that

The display driving of the display panel may be performed during the second period.

A method of driving a display device according to a second embodiment of the present disclosure includes: a display panel including a plurality of touch electrodes; and a viewing angle control panel for adjusting a viewing angle of light, wherein the viewing angle control panel includes a first electrode and a second electrode, and during a first period, the first electrode and the second electrode , and applying a square wave voltage between the first electrode and the second electrode during the second period.

In the method of driving the display device, the first electrode and the second electrode are grounded in a predetermined period included in the second period, and the first period is immediately after the predetermined period.

The touch driving of the display panel may be performed during the first period.

The present invention relates to a display device capable of touch sensing and viewing angle control, and it is possible to increase touch sensing accuracy by removing interference between a driving signal of a viewing angle control panel and a touch sensing signal.

1 illustrates a display device according to embodiments of the present disclosure.
2 illustrates a touch detection circuit of a display device according to embodiments of the present disclosure.
3 to 4 are exemplary views for explaining an irradiation path of light according to a viewing angle adjustment according to embodiments of the present disclosure.
5 illustrates a viewing angle driving circuit of a display device according to example embodiments.
6 is an exemplary diagram for explaining a touch sensing error according to a change in a touch driving signal.
7 is an exemplary diagram for explaining a method of driving a display device according to embodiments of the present disclosure.
8 to 10 are exemplary views for explaining a touch sensing error due to capacitance formation between the touch electrode and the electrode of the viewing angle control panel.
11 to 12 are exemplary views for explaining a method of driving a display device according to a second exemplary embodiment of the present disclosure.
13 is a mux circuit diagram of a viewing angle driving circuit according to a second exemplary embodiment of the present disclosure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification, when an element (or region, layer, portion, etc.) is referred to as "on," "connected to," or "coupled to," another element, it is on the other element. It means that they can be directly connected/coupled or that a third component can be placed between them.

Like reference numerals refer to like components. In addition, in the drawings, thicknesses, ratios, and dimensions of components are exaggerated for effective description of technical content. “and/or” includes any combination of one or more that the associated configurations may define.

Terms such as first, second, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The singular expression includes the plural expression unless the context clearly dictates otherwise.

Terms such as "below", "below", "above", "upper" and the like are used to describe the relationship of the components shown in the drawings. The above terms are relative concepts, and are described based on directions indicated in the drawings.

"Comprise." Or "have." The term such as is intended to designate that there is a feature, number, step, action, component, part, or combination thereof described in the specification, but one or more other features or number, step, action, component, part or It should be understood that it does not preclude the possibility of the existence or addition of combinations thereof.

1 illustrates a display device according to embodiments of the present disclosure.

Referring to FIG. 1 , a display device 100 includes a panel and a driving circuit.

The panel includes a display panel 110 and a viewing angle control panel 120 .

The driving circuit may include a timing control circuit 130 , a source driving circuit 140 , a gate driving circuit 150 and a touch detection circuit 160 , and a viewing angle driving circuit 170 .

The display panel may include a plurality of pixels PX and a plurality of touch electrodes TE.

The display panel 110 may output light. In some embodiments, the display panel 110 may be a liquid crystal display (LCD) panel, an LED display panel, an AMOLED display panel, an OLED display panel, a quantum dot LED (QLED) display panel, or a micro LED display panel. However, the present invention is not limited thereto.

The display panel 110 may include a plurality of pixels (or sub-pixels; PXs) arranged in rows and columns. In some embodiments, the plurality of pixels PX shown in FIG. 1 may be arranged in a grid structure including n rows and m columns (n and m are natural numbers).

In some embodiments, the display panel 110 may include n gate lines GL1 to GLn arranged in m rows and m data lines DL1 to DLm arranged in m columns. The pixels PX may be disposed at intersections of the gate lines GL1 to GLn and the data lines DL1 to DLm.

The pixels PX may include a light emitting device configured to output light and a light emitting device driving circuit for driving the light emitting device. The light emitting device driving circuit may be connected to one gate line and one data line, and the light emitting device may be connected between the light emitting device driving circuit and a power supply voltage (eg, a ground voltage).

In some embodiments, the pixels PX of the display panel 110 may be driven in units of gate lines. For example, pixels arranged on one gate line may be driven during a first period, and pixels arranged on another gate line may be driven during a second period following the first period. In this case, a unit time period in which the pixels PX are driven may be referred to as one horizontal time.

According to embodiments, the light emitting device may be a light emitting diode (LED), an organic light emitting diode (OLED), a quantum dot LED (QLED), or a micro light emitting diode (micro LED). Examples of are not limited to the type of the light emitting device.

Each of the pixels PX includes a red element R that outputs red light, a green element G that outputs green light, a blue element B that outputs blue light, and a white element W that outputs white light. may be one, and in the display panel 110 , a red element, a green element, a blue element, and a white element may be arranged according to various methods.

The light emitting device driving circuit may include a switching device connected to the gate lines GL1 to GLn, for example, a thin film transistor (TFT). When a gate-on signal is applied from the gate lines GL1 to GLn and the switching device is turned on, the light emitting device driving circuit receives a data signal (or a pixel signal) from the data lines DL1 to DLm connected to the light emitting device driving circuit. ) can be supplied as a light emitting device. The light emitting device may output light corresponding to the image signal.

The display panel 110 may include a plurality of touch electrodes TE configured to sense a touch from the outside. In some embodiments, one touch electrode TE may be larger than the size of one pixel PX. For example, the touch electrode TE may have a size corresponding to or larger than the size of the area occupied by the plurality of pixels PX.

The touch electrodes TE may be manufactured separately from the display panel 110 and attached to the display panel 110 , or may be embedded in the display panel 110 . In some embodiments, the touch electrodes TE may be embedded in the display panel 110 . For example, the plurality of touch electrodes TE may be disposed on the display panel 110 in an in-cell type or an on-cell type, and the manufacturing of the display panel 110 is performed. can be prepared together.

Hereinafter, in the present disclosure, it is assumed that the touch electrodes TE are embedded in the display panel 110 and will be described.

The display device 100 may output an image using the display panel 110 , and may sense an external contact using the display panel 110 . According to embodiments, the display device 100 may perform two operations: a display operation for displaying an image and a touch detection operation for sensing a touch.

The timing control circuit 130 may receive the image signal RGB from the outside, process the image signal RGB or convert it to fit the structure of the display panel 110 to generate image data DATA. . The timing control circuit 130 may transmit the image data DATA to the source driving circuit 140 .

The timing control circuit 130 may receive a control signal CS from an external host device. The control signal CS may include, but is not limited to, a horizontal synchronization signal, a vertical synchronization signal, a touch synchronization signal, and a clock signal. In some embodiments, the control signal CS may be transmitted from the processor 400 .

The timing control circuit 130 may control the source driving circuit 140 , the gate driving circuit 150 , the touch detection circuit 160 , and the viewing angle driving circuit 170 based on the received control signal CS . . In some embodiments, the timing control circuit 130 outputs driving control signals for controlling the source driving circuit 140 , the gate driving circuit 150 , the touch detection circuit 160 , and the viewing angle driving control circuit 170 . can do. For example, the timing control circuit 130 may control operation timings of the source driving circuit 140 , the gate driving circuit 150 , the touch detection circuit 160 , and the viewing angle driving control circuit 170 .

In some embodiments, the timing control circuit 130 may transmit a touch synchronization signal for defining a touch detection period to the touch detection circuit 160 .

The source driving circuit 140 generates data signals DS1 to DSm corresponding to the image displayed on the display panel 110 under the control of the timing control circuit 130 , and generates the data signals DS1 to DS1 to DSm) may be transmitted to the display panel 110 . The data signals DS1 to DSm may be transmitted to each of the pixels PX. For example, the source driving circuit 140 converts the data signals DS1 to DSm to be displayed in the 1H period during the 1H period to the pixels PX driven in the 1H period through the data lines DL1 to DLm. can provide

The gate driving circuit 150 may sequentially provide the gate signals GS1 to GSn to the plurality of gate lines GL1 to GLn under the control of the timing control circuit 130 . Each of the gate signals GS1 to GSn is a signal for turning on the pixels PX connected to each of the gate lines GL1 to GLn, and to be applied to a gate terminal of a transistor included in each of the pixels PX. can

The touch detection circuit 160 may drive the display panel 110 during a defined touch detection period, receive a touch detection signal TSS from the display panel 110 , and perform touch detection based on the touch detection signal. have. In some embodiments, the touch detection circuit 160 touches the touch driving signal TDS for driving the touch electrodes TE in the touch detection period defined according to the touch synchronization signal received from the timing control circuit 130 . It may output to the electrodes TE.

When applying the touch driving signal TDS to the at least one touch electrode TE during the touch detection period TS, the touch detection circuit 160 includes the data lines DL1 to DLm of the display panel 110 and Load-free driving corresponding to the touch driving signal TDS by all or part of the gate lines GL1 to GLn) and the remaining touch electrodes TE (to which the touch driving signal TDS is not applied) of the display panel 110 . A signal LFDS may be applied.

The load-free driving signal LFDS is applied to the data lines DL1 to DLm, the gate lines GL1 to GLn, and other touch electrodes to which the touch driving signal TDS is not applied to prevent parasitic capacitance from being formed. It could be a signal.

In some embodiments, the load-free driving signal LFDS may be a signal corresponding to the touch driving signal TDS. For example, the load-free driving signal LFDS may be a signal having the same waveform as the touch driving signal TDS. That is, the load-free driving signal LFDS and the touch driving signal TDS may have substantially the same period, phase, and amplitude.

Also, the touch detection circuit 160 may receive a touch detection signal TSS from the touch electrodes TE and detect a touch using the touch detection signal TSS. In some embodiments, the touch detection circuit 160 may determine at least one of the presence or absence of a touch, the position of the touch, and the intensity of the touch by using the touch detection signal TSS. The touch detection circuit 160 may generate touch result data indicating the presence or absence of a touch, the position of the touch, and the intensity of the touch.

According to some embodiments, the touch detection circuit 160 detects a change in self capacitance between each touch electrode TE and a pointer in contact with the display panel 110 , and uses the detection result to determine whether there is a touch , at least one of the position of the touch and the intensity of the touch may be determined.

In some embodiments, the touch electrodes TE include a driving electrode (also called a touch driving electrode or a transmission electrode) and a sensing electrode (also called a touch sensing electrode or a receiving electrode) electrically separated from each other, and a touch detection circuit 160 outputs a touch driving signal TDS to the driving electrode, receives a touch detection signal TSS from the sensing electrode, and detects a change in mutual capacitance between the driving electrode and the sensing electrode, and , it is possible to determine at least one of the presence or absence of a touch, the position of the touch, and the intensity of the touch using the detection result.

The touch detection circuit 160 may activate or deactivate the touch detection operation based on the detection enable signal DEN transmitted from the outside.

The detection enable signal DEN may be a signal having any one of two logic states (logic state 1 and logic state 0).

According to embodiments, the touch detection circuit 160 operates in a touch activation mode that performs a touch detection operation based on a detection enable signal DEN of a first logic state (eg, logic state 1), and operates in a second logic state. It may operate in a touch inactive mode in which a touch detection operation is not performed based on the detection enable signal DEN of a state (eg, logic state 0). In this case, power consumption in the touch inactive mode may be smaller than power consumption in the touch active mode.

As described above, the display panel 110 may be various types of display panels. In some embodiments, when the display panel 110 is a liquid crystal display panel, common electrodes to which a common voltage is applied to form a pixel electrode and an electric field may be used as the touch electrode TE. In addition, according to embodiments, when the display panel 110 is an OLED display panel, the touch electrodes TE include an emission layer including organic light emitting materials, an anode electrode providing holes to the emission layer, and a cathode electrode providing electrons to the emission layer. It may be formed on a metal layer located on the encapsulation layer covering the .

Hereinafter, for convenience of description, it is assumed that the touch electrodes TE are used as a touch electrode (touch sensor) during a touch detection operation and are used as a common electrode to which a common voltage is applied during a display operation. do.

In this specification, the source driving circuit 140 , the gate driving circuit 150 , the touch detection circuit 160 , and the viewing angle driving circuit 170 may be referred to as driving circuits.

In some embodiments, at least two of the timing control circuit 130 , the source driving circuit 140 , the gate driving circuit 150 , the touch detection circuit 160 , and the viewing angle driving circuit 170 may be integrated into one integrated circuit. circuit) can be implemented. For example, the source driving circuit 140 and the touch detection circuit 160 may be configured as one integrated driving circuit.

The display device 100 may be connected to the connector CNT. The connector CNT may transmit a signal transmitted from an external system (not shown) to the display device 100 . In some embodiments, the connector CNT receives the first driving voltage VDD1 , the second driving voltage VDD2 , and the third driving voltage VDD3 transmitted from an external system (not shown), and the first driving voltage VDD1 may be transmitted to the timing control circuit 30 , the second driving voltage VDD2 may be transmitted to the touch detection circuit 160 , and the third driving voltage VDD3 may be transmitted to the viewing angle driving circuit 170 . The first driving voltage VDD1 , the second driving voltage VDD2 , and the third driving voltage VDD3 may be DC voltages.

In some embodiments, the connector CNT may receive a detection enable signal DEN from an external system (not shown) and transmit the detection enable signal DEN to the touch detection circuit 160 . The connector CNT may receive the viewing angle enable signal VCF_EN from an external system (not shown) and transmit the viewing angle enable signal VCF_EN to the viewing angle driving circuit 170 .

In some embodiments, the timing control circuit 130 may transmit the viewing angle synchronization signal VCF_SYNC for defining the driving timing of the viewing angle driving circuit 170 to the viewing angle driving circuit 170 . The viewing angle synchronization signal VCF_SYNC may be used to define a transition time point of the viewing angle driving signal VDS of the viewing angle driving circuit 170 . Also, the viewing angle synchronization signal VCF_SYNC may be used to define a control timing of the viewing angle driving circuit 170 .

The viewing angle control panel 120 adjusts the viewing angle of light. The viewing angle control panel 120 receives the viewing angle driving signal VDS from the viewing angle driving circuit 170 to adjust the viewing angle of light. The viewing angle driving signal VDS may be supplied in an inversion method in which the polarity is changed while having the same size. The viewing angle driving signal VDS may have a spherical shape.

As described above, the display panel 110 may be various types of display panels.

In some embodiments, when the display panel 110 is a liquid crystal display panel, the viewing angle control panel 120 may be positioned above the display panel 110 to adjust the viewing angle of light emitted from the display panel 110 . In addition, the viewing angle control panel 120 is located between the display panel 110 and the backlight unit BLU that emits light to the rear surface of the display panel 110 to adjust the viewing angle of the light emitted by the backlight unit BLU. have.

In addition, according to embodiments, the viewing angle control panel 120 is positioned above the display panel 110 when the display panel 110 is an OLED display panel and the OLED element is a top emission type display panel ( 110), it is possible to adjust the viewing angle of the emitted light. When the OLED device is a bottom emission type, the viewing angle control panel 120 may be positioned below the display panel 110 to adjust the viewing angle of light emitted from the display panel 110 .

The principle of the viewing angle control panel 120 adjusting the viewing angle of light will be described later with reference to FIGS. 3 to 5 .

2 illustrates a touch detection circuit of a display device according to embodiments of the present disclosure.

The touch detection circuit 160 may include a controller 161 , a driving signal generating circuit 163 , and a detection driving circuit 165 .

The controller 161 may generate the modulation signals MS1 and MS2 for generating the touch driving signal TDS. Also, a touch made on the display panel 110 may be detected using the touch sensing data TSD transmitted from the detection driving circuit 165 . In some embodiments, the controller 161 may be included in the timing control circuit 130 of the display device 100 , but is not limited thereto.

The controller 161 may receive the touch synchronization signal TSYNC output from the timing control circuit 130 . As described above, the touch synchronization signal TSYNC may be a signal used to define the touch detection period TS.

The controller 161 generates the modulation signals MS1 and MS2 during the touch detection period TS based on the received touch synchronization signal TSYNC, and generates the modulation signals MS1 and MS2 by the driving signal generation circuit 163 . ) and the detection driving circuit 165 . In some embodiments, the first modulated signal MS1 and the second modulated signal MS2 may be the same, but the present invention is not limited thereto.

The first modulated signal MS1 is a signal used to generate the touch driving signal TDS, and may be toggled a plurality of times during the touch detection period TS. The second modulation signal MS2 is a signal used to generate the load-free driving signal LFDS, and may be toggled a plurality of times during the touch detection period TS. That is, the modulation signals MS1 and MS2 may be pulse signals.

According to embodiments, the controller 161 may include a register 162 that stores setting values, the controller 161 accesses the register 162 to read the setting values, and based on the read setting values, the controller 161 reads the setting values. At least one of amplitude, phase, and period of the modulated signals MS1 and MS2 may be determined, and the modulated signals MS1 and MS2 may be output according to the determination.

The controller 161 may determine whether to output the modulation signals MS1 and MS2 based on the detection enable signal DEN. In some embodiments, when the detection enable signal DEN of the first logic state (eg, logic state 1) is input, the controller 161 may activate the outputs of the modulation signals MS1 and MS2. On the other hand, when the detection enable signal DEN of the second logic state (eg, logic state 0) is input, the controller 161 may inactivate the outputs of the modulation signals MS1 and MS2 . For example, the controller 161 does not output the modulation signals MS1 and MS2 in response to the detection enable signal DEN of the second logic state or the modulation signals MS1 and MS2 having a pulse level less than the reference level. can be printed out.

Accordingly, the touch detection circuit 160 according to embodiments of the present disclosure may operate in a touch inactive mode in which a touch detection operation is not performed, thereby reducing power consumption. In particular, when operating in the touch inactive mode, the touch detection circuit 160 does not generate the modulation signals MS1 and MS2 itself for the touch detection operation, so power consumption can be reduced.

The controller 161 may operate using the second driving voltage VDD2 transmitted from the connector CNT, and modulated signals based on the detection enable signal DEN under the application of the second driving voltage VDD2. It is possible to determine whether to output (MS1 and MS2). That is, the touch detection circuit 160 according to embodiments of the present disclosure may determine whether to output the modulation signals MS1 and MS2 while receiving the second driving voltage VDD2 for operation.

The controller 161 may transmit a response signal to the processor 400 in response to the request signal transmitted from the processor 400 . The controller 161 may transmit a response signal to the processor 400 regardless of the level of the detection enable signal DEN.

During the touch detection period TS, the driving signal generating circuit 163 may generate a touch driving signal TDS for driving the touch electrodes TE. In some embodiments, the driving signal generating circuit 163 may generate a load-free driving signal LFDS for reducing parasitic capacitance between the touch electrodes TE and other components.

During the display period DS, the driving signal generating circuit 163 may output the pixel voltage and the common voltage VCOM forming an electric field.

The driving signal generating circuit 163 may generate the touch driving signal TDS based on the first modulated signal MS1 . In some embodiments, the driving signal generating circuit 163 may determine the period, amplitude, and phase of the touch driving signal TDS according to the period, amplitude, and phase of the first modulated signal MS1 . That is, the waveform of the touch driving signal TDS output by the driving signal generating circuit 163 may correspond to the waveform of the first modulated signal MS1 .

In some embodiments, the driving signal generating circuit 163 may generate the touch driving signal TDS having the same frequency as the first modulated signal MS1 . That is, the touch driving signal TDS may be toggled the same number of times as the first modulated signal MS1 during the touch detection period TS.

In some embodiments, during the touch detection period TS, the driving signal generating circuit 163 generates the touch driving signal TDS whose level is changed by using the second driving voltage VDD2 and the first modulated signal MS1. can be printed out. In some embodiments, the driving signal generating circuit 163 may generate the touch driving signal TDS by modulating the second driving voltage VDD2 , which is a DC voltage, using the first modulated signal MS1 .

The driving signal generating circuit 163 may generate the load-free driving signal LFDS based on the second modulated signal MS2 . In some embodiments, the driving signal generating circuit 163 may determine the period, amplitude, and phase of the load-free driving signal LFDS according to the period, amplitude, and phase of the second modulated signal MS2 . That is, the waveform of the load-free driving signal LFDS output by the driving signal generating circuit 163 may correspond to the waveform of the second modulated signal MS2 .

In some embodiments, the driving signal generating circuit 163 may generate the load-free driving signal LFDS having the same frequency as the second modulated signal MS2 . That is, the load-free driving signal LFDS may be toggled the same number of times as the second modulation signal MS2 during the touch detection period TS.

According to some embodiments, during the touch detection period TS, the driving signal generating circuit 163 uses the second driving voltage VDD2 and the second modulated signal MS2 to change the level of the load-free driving signal LFDS. can be printed out. In some embodiments, the driving signal generating circuit 163 may generate the load-free driving signal LFDS by modulating the second driving voltage VDD2 , which is a DC voltage, using the second modulation signal MS2 .

Meanwhile, the driving signal generating circuit 163 may not generate the touch driving signal TDS when the first modulated signal MS1 is not received or the first modulated signal MS1 less than the reference level is received. . In addition, the driving signal generating circuit 163 may not generate the load-free driving signal LFDS when the second modulated signal MS2 is not received or the second modulated signal MS2 less than the reference level is received. have.

Therefore, when the touch detection circuit 160 according to embodiments of the present disclosure operates in a touch inactive mode in which a touch detection operation is not performed, modulation signals are not generated and driving signals used for touch detection are not generated accordingly. There is an effect that power consumption can be further reduced.

Also, during the display period DS, the driving signal generating circuit 163 may output the common voltage VCOM having a constant level based on the second driving voltage VDD2. In some embodiments, the driving signal generating circuit 163 may change the level of the second driving voltage VDD2 to output the common voltage VCOM having a constant level.

The driving signal generating circuit 163 may transmit the touch driving signal TDS to the detection driving circuit 165 . Also, the driving signal generating circuit 163 may transmit the load-free driving signal LFDS to the source driving circuit 140 and the gate driving circuit 150 . In some embodiments, the driving signal generating circuit 163 may transmit the load-free driving signal LFDS to the touch electrode TE to which the touch driving signal TDS is not applied, but is not limited thereto.

The detection driving circuit 165 may transmit the touch detection signal TDS to the touch electrodes TE and receive the touch detection signal TSS from the touch electrodes TE.

The detection driving circuit 165 may generate touch detection data TSD indicating a touch detection result by using the touch detection signal TSS and transmit the touch detection data TSD to the controller 161 . In some embodiments, the detection driving circuit 165 may measure a change in the touch detection signal TSS and convert the measurement result into touch detection data TSD, which is digital data. For example, the detection driving circuit 165 may include an integrator for accumulating the voltage of the amplifier to amplify the voltage of the touch detection signal TSS, and an analog-to-digital converter for converting the voltage of the integrator into digital data.

3 to 4 are exemplary views for explaining an irradiation path of light according to a viewing angle adjustment according to embodiments of the present disclosure.

5 illustrates a viewing angle driving circuit of a display device according to example embodiments.

A principle of adjusting the viewing angle of the display device according to the present disclosure will be described in detail with reference to FIGS. 3 to 5 .

A panel according to embodiments of the present disclosure includes a display panel 110 and a viewing angle control panel 120 .

As described above, the position at which the viewing angle control panel 120 is disposed may vary depending on whether the display panel 110 is a liquid crystal display panel, an OLED display panel, or whether the OLED display panel is a bottom emission or a top emission.

Hereinafter, it will be assumed that the display panel 110 is a liquid crystal display panel.

A backlight unit (BLU) emitting light to the rear surface of the panel is disposed, the viewing angle control panel 120 is disposed on the backlight unit (BLU), and the display panel 110 is disposed on the viewing angle control panel 120 . .

The viewing angle control panel 120 includes a light diffusion suppression layer 121 and a light diffusion control layer 125 .

The light diffusion suppressing layer 121 transmits light by imparting straightness. That is, the light emitted from the backlight unit BLU passes through the light diffusion suppression layer 121 to have straightness, and the viewing angle becomes close to 0 degrees.

The light diffusion control layer 125 is a layer that scatters and diffuses light or maintains the straightness of light. The second electrode 127, the first electrode 126 formed on the second electrode 127, and the first and a polymer dispersed liquid crystal layer 129 disposed between the first electrode and the second electrode.

Looking at the polymer dispersed liquid crystal (PDLC), the polymer dispersed liquid crystal (PDLC) operates instantaneously when DC is applied, but then maintains a non-reactive state and then switches the voltage to the corresponding voltage. have responsive properties.

Polymer dispersed liquid crystal (PDLC) is characterized by controlling the transmission of light according to the scattering intensity of light. Several types of structures have been proposed.

If there is no voltage, the polymer dispersed liquid crystal (PDLC) molecules are in an irregular direction and scattering occurs at interfaces with different refractive indices with the medium.

The viewing angle driving signal VDS output from the viewing angle driving circuit 170 is the first electrode 126 disposed on the polymer dispersed liquid crystal layer 129 , or the second electrode 126 disposed below the polymer dispersed liquid crystal layer 129 . A voltage is formed in the polymer dispersed liquid crystal layer 129 by being transferred to any one of the electrodes 127 . For example, the first electrode 126 may be grounded to have a reference voltage value, and the viewing angle driving signal VDS may be applied to the second electrode.

In addition, the viewing angle driving signal VDS output from the viewing angle driving circuit 170 may have a rectangular shape, and the viewing angle driving signal VDS may be applied between the first electrode 126 and the second electrode 127 .

FIG. 3 illustrates a state in which no voltage is formed in the light diffusion control layer 125 , in which liquid crystal molecules have irregular directions. The light emitted from the backlight unit BLU passes through the light diffusion suppressing layer 121 and has straightness, but the light having the straightness is scattered from the light diffusion control layer 125 . As a result, the image displayed on the display device has a wide viewing angle.

On the other hand, FIG. 4 shows a state in which a voltage is formed in the light diffusion control layer 125 and liquid crystal molecules have a constant direction. The light emitted from the backlight unit BLU passes through the light diffusion suppression layer 121 to have straightness, and the light diffusion control layer 125 maintains the straightness. As a result, the image displayed on the display device has a narrow viewing angle.

5 , the viewing angle driving circuit 170 according to embodiments of the present disclosure includes a controller 171 , a driving signal generating circuit 175 , and a MUX circuit 177 .

The controller 171 may generate the control signal CONT1 for generating the viewing angle driving signal VDS. Also, the controller 171 may generate a control signal CONT2 for controlling the mux 177 . In some embodiments, the controller 171 may be included in the timing control circuit 130 of the display device, but is not limited thereto.

The controller 171 may receive the viewing angle synchronization signal VCF_SYNC output from the timing control circuit 130 . As described above, the viewing angle synchronization signal VCF_SYNC may be a signal used to define a transition time point of the viewing angle driving signal VDS. Also, the viewing angle synchronization signal VCF_SYNC may be used to define a control timing of the viewing angle driving circuit 170 . In some embodiments, the controller 171 may include a register 172 that stores setting values.

The controller 171 may operate using the third driving voltage VDD3 transmitted from the connector CNT, and control signals based on the viewing angle enable signal VCF_EN under the application of the third driving voltage VDD3 You can decide whether to output (CONT1, CONT2). In some embodiments, the controller 171 may include a register 172 that stores setting values.

The driving signal generating circuit 175 outputs the viewing angle driving signal VDS to the viewing angle control panel 120 according to the control signal CONT1 output from the controller 171 . The viewing angle control panel 120 receives the viewing angle driving signal VDS from the viewing angle driving circuit 170 to adjust the viewing angle of light. The viewing angle driving signal VDS may have a spherical shape.

The viewing angle driving signal VDS may be transmitted to either the first electrode 126 or the second electrode 127 of the viewing angle control panel 120 . According to embodiments, the viewing angle driving signal VDS is transmitted to the second electrode 127 disposed under the polymer dispersed liquid crystal (PDLC), and the first electrode 126 disposed above the polymer dispersed liquid crystal (PDLC) is A ground signal may be applied to form a voltage in the polymer dispersed liquid crystal (PDLC).

The viewing angle driving signal VDS according to another exemplary embodiment may be applied between the first electrode 126 and the second electrode 127 .

The driving signal generating circuit 175 may supply the viewing angle driving signal VDS having a voltage whose polarity is inverted based on the reference voltage. The viewing angle driving signal VDS may have a rectangular shape. The light diffusion control layer 125 is a method to prevent direct current fixation of the polymer dispersed liquid crystal layer 129 , and may be driven in an inversion manner. For example, the viewing angle driving signal VDS output from the driving signal generating circuit 175 may have a first voltage, a second voltage, and a third voltage. The first voltage may be a reference voltage, and the second voltage and the third voltage may have a rectangular shape with the same magnitude and opposite polarity with respect to the first voltage.

The mux circuit 177 applies a ground signal to the first electrode 126 and the second electrode 127 of the viewing angle control panel 120 according to the control signal CONT2 output by the controller 171 or the first electrode 126 and the second electrode 127 may be placed in a floating state. A detailed description of the mux circuit 177 will be described later with reference to FIGS. 11 to 12 .

<First embodiment>

6 is an exemplary diagram for explaining a touch sensing error according to a change in a touch driving signal.

FIG. 6 shows that a touch error (ghost touch GT) occurs even when the actual display device is not touched due to a transition of the viewing angle driving signal VDS.

The touch synchronization signal TSYNC is used to define the touch detection period TS. Specifically, the touch synchronization signal TSYNC may define a first period and a second period. The first period may be a touch period T, and the second period may be a display period D.

The viewing angle driving signal VDS outputs a first voltage, a second voltage, and a third voltage. The first voltage is a ground (GND) voltage that is a reference voltage, and the second voltage and the third voltage have the same magnitude as 12 [V] based on the first voltage and have opposite polarities.

As described above, the touch detection circuit 160 detects a change in self capacitance between each touch electrode TE and a pointer in contact with the display panel 110, and uses the detection result to determine whether there is a touch, At least one of the position of the touch and the intensity of the touch is determined.

When a transition of the viewing angle driving signal VDS occurs in the touch period T, a touch sensing error may occur. The viewing angle driving signal VDS has a relatively high front-to-front width and transitions, which may affect a signal sensed by the touch detection circuit 160 as noise. As a result, a touch error (GT) recognizing that a touch is made even though the actual display device is not touched occurs.

In order to solve the problem that the touch error GT occurs, it is preferable that a transition of the viewing angle driving signal VDS is made in the display period D.

7 is an exemplary diagram for describing a method of driving a display device according to a first exemplary embodiment of the present disclosure.

In FIG. 7 , unlike in FIG. 6 , a transition of the viewing angle driving signal VDS is made in the display section D . Although noise may be generated due to the variation of the viewing angle driving signal VDS, since it is performed in the display period D, the signal sensed by the touch detection circuit 160 is not affected. Meanwhile, there is no problem because noise generated due to the variation of the viewing angle driving signal VDS has little effect on the operation of the pixel PX included in the display panel 110 .

The viewing angle synchronization signal VCF_SYNC is used to define a transition point of the viewing angle driving signal VDS of the viewing angle driving circuit 170 .

In some embodiments, the timing control circuit 130 may transmit the viewing angle synchronization signal VCF_SYNC for defining the driving timing of the viewing angle driving circuit 170 to the viewing angle driving circuit 170 . The viewing angle synchronization signal VCF_SYNC may be used to define a transition time point of the viewing angle driving signal VDS of the viewing angle driving circuit 170 . Also, the viewing angle synchronization signal VCF_SYNC may be used to define a control timing of the viewing angle driving circuit 170 .

The controller 171 may receive the viewing angle synchronization signal VCF_SYNC output from the timing control circuit 130 . The driving signal generating circuit 175 outputs the driving signal VDS to the viewing angle control panel 120 according to the control signal CONT1 output from the controller 171 . The viewing angle driving signal VDS has a first voltage, a second voltage, and a third voltage, the first voltage is a ground voltage that is a reference voltage, and the second voltage and the third voltage are based on the first voltage. The magnitude is the same as 12[V], and the polarity is opposite. The driving signal generating circuit 175 generates a voltage between the first voltage and the second voltage, the second voltage and the third voltage, and the third voltage and the first voltage in accordance with the viewing angle synchronization signal VCF_SYNC output from the timing control circuit 130 . Transition timing can be adjusted.

As described above, according to the first embodiment of the present disclosure, by making the transition of the viewing angle driving signal VDS occur in the display period D, noise caused by the variation of the viewing angle driving signal VDS is reduced. There is an effect of not affecting the signal sensed by the touch detection circuit 160 . Accordingly, it is possible to prevent a touch error GT of the touch detection circuit 160 due to a noise signal caused by the viewing angle driving signal VDS.

<Second embodiment>

8 to 10 are exemplary views for explaining a touch sensing error due to capacitance formation between the touch electrode and the electrode of the viewing angle control panel.

As described above, the touch detection circuit 160 detects a change in self capacitance between each touch electrode TE and a pointer in contact with the display panel 110, and uses the detection result to determine whether there is a touch, At least one of the position of the touch and the intensity of the touch is determined.

Referring to FIG. 8 , an air gap may exist between the display panel 110 and the viewing angle control panel 120 . In addition, the touch electrode TE is disposed above the air gap, and the first electrode 126 and the second electrode 127 of the viewing angle control panel 120 are disposed below the air gap. is placed. In addition, a ground (GND) voltage, which is a reference voltage, is applied to the first electrode 126 , and a viewing angle driving signal VDS is applied to the second electrode 127 . According to various embodiments, the viewing angle driving signal VDS may have a rectangular shape and may be applied between the first electrode 126 and the second electrode 127 .

In FIG. 10, the viewing angle driving signal VDS is shown as a square wave. The viewing angle driving signal VDS may be applied between the first electrode 126 and the second electrode 127 . A voltage difference is generated between the first electrode 126 and the second electrode 127 according to the viewing angle driving signal VDS, and the polymer dispersed liquid crystal (PDLC) molecules of the polymer dispersed liquid crystal layer 129 are generated by the voltage difference. The direction of the liquid crystal becomes even, and it becomes a transmissive state.

Due to the voltage of the viewing angle driving signal VDS applied between the first electrode 126 and the second electrode 127 , a voltage is applied between the touch electrode TE and the first electrode 126 and the second electrode 127 . this is formed In addition, since an air gap and a polymer dispersed liquid crystal layer 129 are disposed between the touch electrode TE and the first electrode 126 and the second electrode 127, they are insulated. Accordingly, the touch electrode TE and the first electrode 126 may form a capacitor CAP_g1 , and the electrode TE and the second electrode 127 may form a capacitor CAP_g2 . Since the interval h2 between the touch electrode TE and the second electrode 127 is relatively larger than the interval h1 between the touch electrode TE and the first electrode 126 , CAP_g1 has a larger value than CAP_g2 . .

FIG. 9 shows that there is a change in the air gap between the display panel 110 including the plurality of touch electrodes TE and the viewing angle control panel 120 .

The air gap variation may be caused by a bending phenomenon of the display panel 110 by a finger touch or a bending phenomenon of the viewing angle control panel 120 due to a rear pressing.

Variation in the air gap may reduce the interval h1 between the touch electrode TE and the first electrode 126 and the interval h2 between the touch electrode TE and the second electrode 127 .

Since the capacitor is inversely proportional to the distance between the two electrodes, the air gap variation is CAP_g1 formed between the touch electrode TE and the first electrode 126 , and the touch electrode TE and the second electrode 127 . ), the value of the capacitor of GAP_g2 formed between them can be changed. A change in the capacitor values of GAP_g1 and GAP_g2 may act as a serious noise signal for touch sensing. In particular, since CAP_g1 has a larger value than CAP_g2, a change in the capacitor value of GAP_g1 may act as a more serious noise signal for touch sensing.

As a result, as in case A, the touch sensing circuit 160 does not detect a touch signal even when an actual touch is made, or as in case B, the touch sensing circuit 160 detects a touch signal even when an actual touch is made. A sensing error (GT) may occur.

11 to 12 are exemplary views for explaining a method of driving a display device according to a second exemplary embodiment of the present disclosure.

13 is a mux circuit diagram of a viewing angle driving circuit according to a second exemplary embodiment of the present disclosure.

Due to the change in the air gap, the capacitor CAP_g1 formed between the touch electrode TE and the first electrode 126 and the GAP_g2 formed between the touch electrode TE and the second electrode 127 are changed. In particular, it has been explained that a change in CAP_g1 acts as a serious noise signal for touch sensing, resulting in a touch sensing error (GT).

As a method for solving this problem, in the display device according to the exemplary embodiment of the present disclosure, the viewing angle driving signal VDS is provided between the first electrode 126 and the second electrode 127 during the second period that is the display period D. ) is applied, but the first electrode 126 and the second electrode 127 are floated during the first period that is the touch period T.

Example 2-1

11 is a waveform diagram of VDS applied to the first electrode and the second electrode according to the 2-1 embodiment.

In the touch period T, the first electrode 126 and the second electrode 127 are in a floating state, and in the display period D, a square wave VDS is applied between the first electrode 126 and the second electrode 127 . showing what has been

Since the first electrode 126 is in a floating state in the touch period T, the capacitor CAP_g1 is not formed between the touch electrode TE and the first electrode 126 . In addition, since the second electrode 127 is also in a floating state in the touch period T, the capacitor CAP_g2 is not formed between the touch electrode TE and the second electrode 127 . Since the capacitors CAP_g1 and GAP_g2 are not formed in the touch period T, a root cause of a touch sensing error GT due to an air gap change may be eliminated.

Meanwhile, since the first electrode 126 and the second electrode 127 are in a floating state in the touch period T, no voltage is formed in the polymer dispersed liquid crystal layer 129 . Accordingly, the light diffusion control layer 125 may not operate. However, since the viewing angle adjustment is generally essential in the display period D and not necessarily necessary in the touch period T, there is no problem.

Example 2-2

12 is a waveform diagram of VDS applied to the first electrode and the second electrode according to the second embodiment.

As in FIG. 11 , the first electrode 126 and the second electrode 127 are in a floating state in the touch section T, and between the first electrode 126 and the second electrode 127 in the display section D. It shows that the viewing angle driving signal VDS, which is a square wave, is applied.

Meanwhile, in the 2-2 embodiment, unlike the 2-1 embodiment, the viewing angle driving signal VDS is supplied between the first electrode 126 and the second electrode 127 in the entire display section D. it is not The viewing angle driving signal VDS is supplied between the first electrode 126 and the second electrode 127 in the first display period D1 by dividing the display period D, and in the second display period D2, the first display period D1. The electrode 126 and the second electrode 127 are grounded.

When a square wave VDS is applied between the first electrode 126 and the second electrode 127 and the first electrode 126 and the second electrode 127 are immediately floated, the first electrode 126 and the second electrode 127 are Since the polymer dispersed liquid crystal layer 129 which is an insulating material is disposed between the two electrodes 127 , charges may be charged in the first electrode 126 and the second electrode 127 . When the viewing angle driving signal VDS is applied again in the display period D after the touch period T ends, the polymer dispersed liquid crystal layer 129 may not operate normally due to the charged charges. Accordingly, a process of discharging the charged charges is required just before the first electrode 126 and the second electrode 127 float in the touch period T.

In order to solve this problem, the display device according to the second embodiment 2-2 includes the first electrode 126 and the second electrode ( 127) is grounded to discharge the charged charges. That is, the display device according to the second exemplary embodiment divides the display period D and applies the viewing angle driving signal VDS between the first electrode 126 and the second electrode 127 in the first display period D1 . It is characterized in that the first electrode 126 and the second electrode 127 are connected to the ground in the second display period D2.

Since the first electrode 126 and the second electrode 127 are grounded in the second display period D2 , the light diffusion control layer 125 may not operate. However, it was confirmed that the time required for the photodischarge is several milliseconds, and several milliseconds is sufficient for the second display period D2 in which the first electrode 126 and the second electrode 127 are grounded. Therefore, even if the light diffusion control layer 125 does not operate in the second display period D2 , it is not recognized by the user of the display device, so it is not a problem.

The viewing angle driving circuit 170 according to the second exemplary embodiment of the present disclosure includes a controller 171 , a driving signal generating circuit 175 , and a MUX circuit 177 (refer to FIG. 5 ). The controller 171 may generate a control signal CONT2 for controlling the mux 177 . The controller 171 may receive the viewing angle synchronization signal VCF_SYNC output from the timing control circuit 130 . The touch synchronization signal TSYNC is used to define the touch detection period TS. Specifically, the touch synchronization signal TSYNC may define a first period and a second period. The first period may be a touch period T, and the second period may be a display period D.

13 is a mux circuit diagram of a viewing angle driving circuit according to a second exemplary embodiment of the present disclosure.

The mux circuit 177 connects the first electrode 126 and the second electrode 127 of the viewing angle control panel 120 to the ground according to the control signal CONT2 output from the controller 171, or the first electrode ( 126 ) and the second electrode 127 may be connected to a floating terminal, or an output terminal of the driving signal generating circuit 175 may be connected between the first electrode 126 and the second electrode 127 . The MUX circuit 177 may be configured as a 3:1 MUX. The MUX includes first to third switches M1, M2, and M3.

The first switch M1 is positioned between the output terminal of the driving signal generating circuit 175 and the connection terminals of the first electrode 126 and the second electrode 127 .

The second switch M2 is positioned between the floating terminal and the connection terminals of the first electrode 126 and the second electrode 127 .

The third switch M3 is positioned between the ground terminal and the connection terminals of the first electrode 126 and the second electrode 127 .

The controller 171 receives the viewing angle synchronization signal VCF_SYNC output from the timing control circuit 130 and outputs a control signal CONT2 for controlling the mux circuit 177 .

The mux circuit 177 according to the 2-1 embodiment switches ON M2 and switches M1 and M3 OFF in the touch period T, which is the first period, according to the control signal CONT2 output by the controller 171 . Thus, the first electrode 126 and the second electrode 127 are floated. In addition, the mux circuit 177 switches on M1 in the display period D that is the second period according to the control signal CONT2 output from the controller 171 and switches M2 and M3 off to switch off the first electrode 126 . ) and the second electrode 127 are connected to an output terminal of the driving signal generating circuit 175 .

The mux circuit 177 according to the 2-2 embodiment switches on M2 in the touch period T according to the control signal CONT2 output from the controller 171 and switches M1 and M3 off to switch off the first electrode 126 and the second electrode 127 are floated. In addition, the mux circuit 177 switches on M1 in the first display period D1 in response to the control signal CONT2 output from the controller 171 and switches M2 and M3 off to switch off the first electrode 126 and the first electrode 126 . The second electrode 127 is connected to the output terminal of the driving signal generating circuit 175 . In addition, the mux circuit 177 switches on M3 in the second display period D2 in response to the control signal CONT2 output from the controller 171 and switches M1 and M2 off to switch off the first electrode 126 and the first electrode 126 . The second electrode 127 is connected to the ground terminal.

It should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the claims of the present invention. .

100: display device
110: display panel
120: viewing angle control panel
130: timing control circuit
140: source driving circuit
150: gate driving circuit
160: touch detection circuit
170: viewing angle driving circuit

Claims (16)

panel; and a driving circuit for transmitting a signal to the panel,
the panel is
a display panel including a plurality of pixels and a plurality of touch electrodes; and
Comprising a viewing angle control panel for adjusting the viewing angle of light,
The driving circuit is
a touch detection circuit outputting a touch driving signal to the plurality of touch electrodes;
a viewing angle driving circuit for outputting a viewing angle driving signal to the viewing angle control panel; and
a timing control circuit for outputting a control signal to the touch detection circuit and the viewing angle driving circuit;
and the timing control circuit controls the touch detection circuit to be driven during a first period, and a voltage output from the viewing angle driving circuit to the viewing angle control panel to be changed during a second period.
According to claim 1,
The driving circuit is
a display driver for driving the pixels of the display panel;
and the timing control circuit controls the display driver to be driven during the second period.
According to claim 1,
The viewing angle driving circuit outputs a square wave voltage.
According to claim 1,
The viewing angle control panel is
It includes a light diffusion control layer that scatters and diffuses the light or maintains the straightness of the light,
The light diffusion control layer includes a first electrode and a second electrode.
According to claim 1,
the display device
Further comprising a backlight unit emitting light to the rear of the panel,
The viewing angle control panel is disposed between the display panel and the backlight unit, and controls a viewing angle of light emitted from the backlight unit.
panel; and a driving circuit for transmitting a signal to the panel,
the panel is
a display panel including a plurality of pixels and a plurality of touch electrodes; and
Comprising a viewing angle control panel for adjusting the viewing angle of light,
The viewing angle control panel is
It includes a light diffusion control layer that scatters and diffuses the light or maintains the straightness of the light,
The light diffusion control layer includes a first electrode and a second electrode,
The driving circuit is
Floating the first electrode and the second electrode for a first period,
The display device of claim 1 , wherein a square wave voltage is applied between the first electrode and the second electrode during a second period.
7. The method of claim 6,
The driving circuit is
Grounding the first electrode and the second electrode in a predetermined section included in the second period,
and the first period is immediately after the predetermined period.
7. The method of claim 6,
The driving circuit is
a touch detection circuit outputting a touch driving signal to the plurality of touch electrodes;
a viewing angle driving circuit for outputting a viewing angle driving signal to the viewing angle control panel; and
a timing control circuit for outputting a control signal to the touch detection circuit and the viewing angle driving circuit;
and the timing control circuit controls the touch detection circuit to be driven during the first period.
7. The method of claim 6,
The light diffusion control layer is
and a polymer dispersed liquid crystal (PDLC) layer disposed between the first electrode and the second electrode.
7. The method of claim 6,
the display device
Further comprising a backlight unit emitting light to the rear of the panel,
The viewing angle control panel is disposed between the display panel and the backlight unit, and controls a viewing angle of light emitted from the backlight unit.
11. The method of claim 10,
The viewing angle control panel is
The display device of claim 1, further comprising: a light diffusion suppressing layer that transmits the light emitted from the backlight unit by imparting straightness to the light.
a display panel including a plurality of touch electrodes; and a viewing angle control panel for adjusting a viewing angle of light, the method comprising:
The touch driving of the display panel is performed during a first period,
The method of driving a display device, wherein the voltage output to the viewing angle control panel is changed during a second period.
13. The method of claim 12,
The driving method of the display device, wherein the display of the display panel is driven during the second period.
a display panel including a plurality of touch electrodes; and a viewing angle control panel for adjusting a viewing angle of light, the method comprising:
The viewing angle control panel includes a first electrode and a second electrode,
Floating the first electrode and the second electrode for a first period,
During a second period, a square wave voltage is applied between the first electrode and the second electrode.
15. The method of claim 14,
A method of driving the display device is
Grounding the first electrode and the second electrode in a predetermined section included in the second period,
and the first period is immediately after the predetermined period.
15. The method of claim 14,
The method of driving the display device, wherein the touch driving of the display panel is performed during the first period.

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