TWI686735B - Integrated touch display device and driving method thereof - Google Patents

Abstract

An integrated touch display device includes a display panel, a touch circuit and a light sensing circuit. The display panel includes multiple data lines and multiple scan lines, and is electrically connected to a data driving unit and a scan driving unit, so that the display panel updates a display screen according to a display driving signal. The touch circuit is arranged on the display panel and electrically connected to a touch detection unit for performing touch detection according to a touch drive signal. The light sensing circuit is arranged on the display panel and electrically connected to a fingerprint identification unit for performing fingerprint identification according to a light sensing driving signal. The integrated touch display device determines whether enabling the light sense drive signal according to the touch drive signal or the display drive signal.

Description

Integrated touch display device and driving method thereof

The present disclosure relates to an integrated touch display device, particularly a device that combines display, touch detection and fingerprint identification.

With the development of technology, "information security" has become an important consideration for consumers when using electronic devices. Therefore, many electronic devices are designed with a user authentication mechanism (Authentication) to control data access. Among various authentication mechanisms, "fingerprint identification" is the most common, because "fingerprint identification" is easy to be integrated in electronic devices, and is identified based on biological characteristics, which has high security.

At present, the display device often needs to have a touch function or a fingerprint recognition function. Therefore, it is necessary to design the structure of the display device and its driving method in response to market demand.

One aspect of the disclosure is an integrated touch display device. The integrated touch display device includes a display panel, a touch circuit and a light sensing circuit. The display panel includes a plurality of data lines and a plurality of scan lines. Some The data lines are electrically connected to the data driving unit, and the scanning lines are electrically connected to the scanning driving unit, so that the display panel is used to update the display frame during a frame period according to the display driving signal. The touch circuit is disposed on the first substrate of the display panel and is electrically connected to the touch detection unit for performing touch detection according to the touch driving signal. The light-sensing circuit is disposed on the second substrate of the display panel, and is electrically connected to the fingerprint recognition unit for performing fingerprint recognition according to the light-sensing driving signal. The integrated touch display device determines whether to enable the light-sensing drive signal according to the touch drive signal or/and the display drive signal.

Another aspect of the present disclosure is a driving method applied to an integrated touch display device. The driving method includes the following steps: updating the display screen according to the display driving signal through the display panel. Through the touch circuit, touch detection is performed according to the touch drive signal. According to the touch driving signal or/and the display driving signal, the light-sensing driving signal is enabled to scan the fingerprint recognition area through the light-sensing circuit. When the display driving signal or the touch driving signal is in the enabling level, the light-sensing driving signal is disabled.

In this way, the integrated touch display device can determine whether the touch drive signal and the display drive signal will cause interference to the light-sensing drive signal after confirming the current state of the touch drive signal and the display drive signal, and then enable according to the judgment result The light-sensing driving signal can therefore ensure the accuracy of fingerprint recognition.

100‧‧‧Integrated touch display device

110‧‧‧Display panel

111‧‧‧The first substrate

112‧‧‧Second substrate

112a‧‧‧First controller

112b‧‧‧Second controller

113‧‧‧Drive layer

113a‧‧‧Pixel electrode

114‧‧‧Liquid crystal layer

120‧‧‧Touch circuit

130‧‧‧Light sensing circuit

140‧‧‧ processing circuit

141‧‧‧Data drive unit

142‧‧‧ Scan drive unit

143‧‧‧Touch detection unit

144‧‧‧fingerprint identification unit

150‧‧‧Backlight components

Sc‧‧‧Light drive signal

Sd‧‧‧Display drive signal

St‧‧‧Touch drive signal

Se‧‧‧Enhanced signal

Sy‧‧‧Sync signal

stv‧‧‧Start signal

ckv‧‧‧clock signal

ckv_w‧‧‧clock signal

oe‧‧‧Enable signal

TP‧‧‧Touch signal

VCOM‧‧‧electrode signal

P1‧‧‧ display period

P2‧‧‧During touch

P3‧‧‧ during scanning

S01~S05‧‧‧Step

Figure 1 is an integrated diagram according to some embodiments of the present disclosure A schematic diagram of a touch display device.

FIG. 2 is a partial schematic diagram of a display panel according to some embodiments of the present disclosure.

FIG. 3 is a timing diagram of an integrated touch display device in some embodiments of the disclosure.

4A~4E are timing diagrams of the integrated touch display device according to different embodiments of the present disclosure.

FIG. 5 is a flowchart of a driving method according to some embodiments of the present disclosure.

In the following, a plurality of embodiments of the case will be disclosed in a diagram. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the case. That is to say, in some embodiments of the present disclosure, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventional structures and elements will be shown in a simple schematic manner in the drawings.

In this article, when an element is referred to as "connected" or "coupled", it can be referred to as "electrically connected" or "electrically coupled." "Connected" or "coupled" can also be used to indicate that two or more components interact or interact with each other. In addition, although terms such as "first", "second", etc. are used herein to describe different elements, the terms are only used to distinguish elements or operations described in the same technical terms. Unless the context clearly dictates, the term does not specifically refer to or imply order or order, nor is it intended to limit the present invention.

Please refer to FIG. 1, which is a schematic diagram of an integrated touch display device 100 according to some embodiments of the present disclosure. The integrated touch display device 100 includes a display panel 110, a touch circuit 120, and a light sensing circuit 130. In this embodiment, the display panel 110 is used to display a display screen according to an image data. The touch circuit 120 is used to detect the touch position of the user. The light-sensing circuit 130 is used to scan a fingerprint recognition area to detect biological information such as a user's fingerprint. The touch circuit 120 may be an in-cell touch display panel.

Please refer to FIG. 2, which is a partial schematic view of the display panel 110 according to some embodiments of the present disclosure. The display panel 110 includes a plurality of data lines DL and a plurality of scan lines GL. The data lines DL are electrically connected to the data driving unit 141, and the scan lines GL are electrically connected to the scan driving unit 142. In some embodiments, the data driving unit 141 and the scanning driving unit 142 are disposed in the processing circuit 140, and the processing circuit 140 is used to generate the display driving signal Sd. The display panel 110 is used to update the display image in each frame period according to the display driving signal Sd.

In some embodiments, the display panel 110 includes a first substrate 111 and a second substrate 112. The touch circuit 120 is disposed on the first substrate 111 of the display panel 110 and is electrically connected to the touch detection unit 143 in the processing circuit 140 for performing touch detection according to the touch driving signal St. The light-sensing circuit 130 is disposed on the second substrate 112 of the display panel 110 and is electrically connected to the fingerprint recognition unit 144 in the processing circuit 140 for performing fingerprint recognition according to the light-sensing driving signal Sc. According to whether the touch drive signal St or/and the display drive signal Sd are enabled, the integrated touch display device 100 can decide whether to enable light Sensing drive signal Sc to perform fingerprint identification. In some embodiments, the second substrate 112 may include a plurality of light-sensing circuits 130, and the light-sensing circuit 130 has a plurality of light-sensing elements, which may vary according to the light intensity of the outside world. For example, the light-sensing element may be an optical film that changes with the intensity of light, or a capacitive optical layer, or a capacitive element formed by a transistor in series with a diode, etc. The disclosure is not limited to this. .

In this way, since the integrated touch display device 100 can first determine whether the touch drive signal St and the display drive signal Sd are enabled, or whether the current state of the touch drive signal St and the display drive signal Sd will interfere with the light-sensing drive The signal Sc, and then the light-sensing driving signal Sc is enabled according to the judgment result. Therefore, it can ensure that the touch detection unit 143 does not cause an error in detection due to the interference of other signals during touch detection, thereby improving Fingerprint recognition accuracy.

To facilitate understanding of the embodiments of the present disclosure, the structural composition of the display panel 110 is described in detail below. Please refer to FIGS. 1-2. In some embodiments, the materials of the first substrate 111 and the second substrate 112 may be substantially transparent glass or plastic materials. In addition, the display panel 110 further includes a driving layer 113 and a liquid crystal layer 114. The driving layer 113 and the liquid crystal layer 114 are located between the first substrate 111 and the second substrate 112. The driving layer 113 includes a plurality of pixel electrodes 113a arranged in an array to generate an electric field to change the deflection angle of the liquid crystal in the liquid crystal layer 114. In some embodiments, the touch circuit 120 includes a plurality of touch sensing electrodes, and a predetermined interval is maintained between the touch sensing electrodes to detect the touch of the user's hand and recognize that the touch corresponds to the display Corresponding coordinates on the panel 110. Of which there are as many as 110 display panels The transistor elements required for each pixel circuit are formed on the driving layer 113. In one embodiment, the elements required for the touch circuit 120 are formed together with the elements of the pixel circuit on the driving layer 113. The touch circuit 120 The required components may include transistors, capacitors, etc., and the disclosure is not limited thereto.

In some embodiments, the data driving unit 141, the scanning driving unit 142, the touch detection unit 143 and the fingerprint recognition unit 144 may be integrated chips in the integrated touch display device 100.

In some embodiments, as shown in FIG. 2, the processing circuit 140 can first generate the synchronization signal Sy according to the touch driving signal St and the display driving signal Sd. In this way, the fingerprint recognition unit 144 can know the touch according to the synchronization signal Sy Control the real-time status of the driving signal St and display driving signal Sd, and choose to enable or disable the light-sensing driving signal Sc. For example, as shown in FIG. 2, the touch detection unit 143 and the fingerprint recognition unit 144 may be implemented as a first controller 112a and a second controller 112b on the second substrate 112 to generate a touch drive Signal St and light-sensing driving signal Sc (eg, the first controller 112a is used to generate the "vertical direction" touch driving signal St and the light-sensing driving signal Sc, and the second controller 112b is used to generate the "horizontal direction" touch Drive signal St and light-sensing drive signal Sc). The data driving unit 141 or the scanning driving unit 142 can transmit the display driving signal Sd to the second controller 112b to confirm the current state of the display driving signal Sd, and at the same time, the second controller 112b can also confirm the touch driving signal St The current state is to generate the synchronization signal Sy, and then determine whether it is suitable to enable the light-sensing driving signal Sc. In some embodiments, the touch detection unit 143, the fingerprint recognition unit 144, the first controller 112a and the second controller 112b may be integrated into the same control device (such as the processing circuit shown in FIG. 1) road).

Please refer to FIGS. 1 to 3, where FIG. 3 is a timing diagram of the integrated touch display device 100 in some embodiments of the present disclosure. In some embodiments, the display panel 110 updates the display image within a frame period F. The frame period F includes at least one display period P1 and a touch period P2. The display panel 110 updates the display screen during the display period P1, and the touch circuit 120 performs touch detection during the touch period P2. In some other embodiments, the display period P1 and the touch period P2 may be a plurality of, that is, the display panel 110 may update the picture in sections or perform touch detection in sections. As shown in FIG. 3, in some embodiments, the display driving signal Sd includes a start signal stv, a clock signal ckv, and an enable signal oe. The touch driving signal St includes the touch signal TP and the electrode signal VCOM. The start signal stv is the start synchronization signal of each frame period F, and is used as a function to enable the notification signal of the frame period F. The clock signal ckv is used to enable the display panel 110 to drive the scan line GL based on the scan driving unit 142 and to repeatedly exchange AC signals with high and low levels within the frame period F. The enable signal oe is a synchronous signal when the data driving unit 141 is enabled, and the AC signal with high and low levels is repeated within the frame period F. The touch signal TP is used to enable the touch circuit 120. In this embodiment, when the touch signal TP is at a low potential, the touch circuit 120 performs touch detection accordingly. The electrode signal VCOM repeatedly exchanges AC signals with high and low levels within the frame period F, so that the touch circuit 120 sequentially detects the current state (eg, capacitance change) of each touch sensing electrode. Since those skilled in the art can understand the display principle and the touch principle of the touch panel, the operation details of the display driving signal Sd and the touch driving signal St will not be described here.

In some embodiments, the integrated touch display device 100 One of the plurality of frame periods F is selected to perform fingerprint recognition. In some embodiments, when the display driving signal Sd or the touch driving signal St is at the enabling level, the fingerprint recognition unit 144 will disable the light-sensing driving signal Sc to avoid the interference of the light-sensing driving signal Sc. According to different driving methods, the recognition period P3 may be located in the touch period P1 or the touch period P2, details will be described later.

Here, taking FIGS. 4A to 4E as an example, various driving methods of the disclosure are described as follows. Please refer to FIG. 4A. In some embodiments, the integrated touch display device 100 selects one of the frame periods F, and in this frame period F, it stops updating the display screen and stops touch detection, to Prevent the display driving signal Sd or the touch driving signal St from interfering with the light-sensing driving signal Sc. As shown in FIG. 4A, in the frame period F, the data driving unit 141 and the scanning driving unit 142 disable the display driving signal Sd, and the touch detection unit 143 disables the touch driving signal St. At this time, the synchronizing signal Sy will be able to have a consistent energy level (such as a low voltage level) in this frame period F to indicate that fingerprint identification can be performed in this frame period F. That is, the fingerprint identification unit 144 can perform fingerprint identification at any time during this frame period F.

In some embodiments, the integrated touch display device 100 selects one of the frame periods F, and during this frame period F, stops performing touch detection to facilitate fingerprint recognition during the touch period P2. As shown in FIG. 4B, during the touch period P2, the touch detection unit 143 disables the touch drive signal St, so that the fingerprint recognition unit 144 enables the light-sensitive drive signal Sc during the touch period P2. That is, the fingerprint recognition unit 144 can perform fingerprint recognition at any time within the touch period P2 in this frame period F.

In some embodiments, the integrated touch display device 100 selects one of the frame periods F, and in this frame period F, it stops updating the display image to facilitate fingerprint recognition during the display period P1. Since the time of one frame period F is extremely short, the display effect of the display screen is not reduced accordingly. As shown in FIG. 4C, during the display period P1, the data driving unit 141 and the scan driving unit 142 disable the display driving signal Sd, so that the fingerprint recognition unit 144 enables the light-sensitive driving signal Sc during the display period P1. That is, the fingerprint identification unit 144 can perform fingerprint identification at any time within the display period P1 in this frame period F.

In some embodiments, the integrated touch display device 100 selects one of the frame periods F and performs fingerprint recognition during the touch period P2 of the one frame period F. Since the touch detection unit 143 sequentially scans different positions on the display screen to detect the position of the user's hand, as long as the fingerprint recognition area can avoid the detection area of the touch circuit 120, the light drive signal Sc will not be disturbed. Please refer to FIGS. 1 and 4D, where ckv_w is a clock signal sent by the touch detection unit 143 to match with the touch driving signal St. The fingerprint recognition unit 144 enables the light-sensitive driving signal Sc during the touch period P2. The processing circuit 140 can determine the detection area currently detected by the touch circuit 120 to generate the synchronization signal Sy. When the detection area of the touch circuit 120 corresponds to the fingerprint identification area, the synchronization signal Sy is at a high voltage level, and the fingerprint identification The unit 144 temporarily disables the light driving signal Sc. When the detection area of the touch circuit 120 does not correspond to the fingerprint recognition area, the synchronization signal Sy is at a low voltage level. At this time, the fingerprint recognition unit 144 enables the light-sensing drive signal Sc.

In some embodiments, the integrated touch display device 100 Select one of the frame periods F, and perform fingerprint recognition during the display period P1 of this frame period F. Since the display panel 110 sequentially drives the pixel electrodes 113 of each column during the display period P1, as long as the current driving area of the display panel 110 avoids the detection area of the touch circuit 120, the light-sensitive driving signal Sc does not Will be disturbed. As shown in FIG. 4E, the fingerprint identification unit 144 enables the light-sensitive driving signal Sc during the display period P1. The processing circuit 140 can determine the driving area currently driven by the display panel 110. When the driving area of the display panel 110 corresponds to the fingerprint recognition area, the synchronization signal Sy is controlled at a low voltage level, and the fingerprint recognition unit 144 disables the light sensor Drive signal Sc. When the driving area of the display panel 110 does not correspond to the fingerprint recognition area, the synchronization signal is controlled at a high voltage level, and the fingerprint recognition unit 144 enables the light-sensitive driving signal Sc.

In some embodiments, the integrated touch display device may further include a backlight element 150. The backlight element 150 is disposed at a position corresponding to the display panel 110 in the integrated touch display device 100, for example, below the first substrate 111, and before the fingerprint recognition unit 144 enables the light-sensitive driving signal Sc, the processing circuit 140 The enhanced signal Se is first sent to the backlight element 150, so that the backlight element 150 projects backlight light to the fingerprint recognition area 130a according to the enhanced signal Se. In this way, it can be ensured that the fingerprint recognition unit 144 can clearly recognize the fingerprint of the user.

Please refer to FIG. 5, which is a driving method of the integrated touch display device 100 in some embodiments of the present disclosure. The driving method includes the following steps: First, in step S01, the display panel 110 updates the display screen according to the display driving signal Sd, and the touch circuit 120 according to the touch driving signal No. St for touch detection. In step S02, the processing circuit 140 generates a synchronization signal Sy according to the current state of the touch driving signal St and the display driving signal Sd.

Next, in step S03, the fingerprint identification unit 144 enables the light-sensing driving signal Sc according to the synchronization signal Sy to scan the fingerprint identification area on the display panel 110. In step S04, the processing circuit 140 determines whether the display driving signal Sd or the touch driving signal St is in the enabling level? If yes, in step S05, the fingerprint recognition unit 144 will disable the light-sensing driving signal Sc; if not, return to step S03 to complete the fingerprint scanning.

As described in the embodiments of FIGS. 4A to 4E, in some embodiments, the driving method of the integrated touch display device 100 includes at least five ways of enabling the light-driven driving signal Sc.

The first embodiment makes the light-sensitive driving signal Sc completely avoid the display driving signal Sd or the touch driving signal St. That is, in some embodiments, the processing circuit 140 disables the display driving signal Sd and the touch driving signal St during one frame period F, and at the same time enables the light-sensitive driving signal Sc during the frame period F.

The second embodiment makes the light-sensitive driving signal Sc completely avoid the touch driving signal St. That is, in some embodiments, the processing circuit 140 disables the touch drive signal St during a touch period P2, and enables the light drive signal Sc during the touch period P2.

The third embodiment makes the light-sensitive driving signal Sc completely avoid the display driving signal Sd. That is, in some embodiments, the processing circuit 140 disables the display drive signal Sd during a display period P1, and enables the light-sensitive drive signal Sc during the display period P1.

The fourth embodiment makes the light-sensitive driving signal Sc selectively avoid the touch driving signal St. That is, in some embodiments, the processing circuit 140 enables the light-sensitive driving signal Sc during the touch period P2. At the same time, the processing circuit 140 will determine whether the detection area of the touch circuit 120 corresponds to the fingerprint recognition area of the light sensing circuit 130? If yes, the light-sensitive driving signal Sc is disabled.

The fifth embodiment makes the light-sensitive driving signal Sc selectively avoid the display driving signal Sd. That is, in some embodiments, the processing circuit 140 enables the light-sensitive driving signal Sc during the display period P1. At the same time, the processing circuit 140 can determine whether the driving area of the display panel 110 corresponds to the fingerprint recognition area? If yes, the light-sensitive driving signal Sc is disabled.

In the embodiments of the present disclosure, the processing circuit 140 can generate a synchronization signal Sy according to the current state of the touch driving signal St and the display driving signal Sd, so that the fingerprint recognition unit 144 enables or disables the light sensing training signal. According to different embodiments, the processing circuit 140 can choose to perform fingerprint scanning during the display period P1 or the touch period P2, and make the light sensing circuit 130 avoid the interference of the touch driving signal St and the display driving signal Sd. Therefore, the integrated type The fingerprint scanning accuracy of the touch display device 100 will be greatly improved.

Although the present disclosure has been disclosed as above by way of implementation, it is not intended to limit the content of the present invention. Anyone who is familiar with this skill can make various changes and modifications within the spirit and scope of the present content, so the present invention The protection scope of the content shall be deemed as defined by the scope of the attached patent application.

100‧‧‧Integrated touch display device

110‧‧‧Display panel

111‧‧‧The first substrate

112‧‧‧Second substrate

113‧‧‧Drive layer

113a‧‧‧Pixel electrode

114‧‧‧Liquid crystal layer

120‧‧‧Touch circuit

130‧‧‧Light sensing circuit

140‧‧‧ processing circuit

141‧‧‧Data drive unit

142‧‧‧ Scan drive unit

143‧‧‧Touch detection unit

144‧‧‧fingerprint identification unit

150‧‧‧Backlight components

Sc‧‧‧Light drive signal

Sd‧‧‧Display drive signal

St‧‧‧Touch drive signal

Se‧‧‧Enhanced signal

Claims (15)

An integrated touch display device includes: a display panel including a plurality of data lines and a plurality of scan lines, wherein the data lines are electrically connected to a data drive unit, and the scan lines are electrically connected to a scan drive Unit, so that the display panel is used to update a display frame during a frame period according to a display driving signal; a touch circuit is provided on a first substrate of the display panel and is electrically connected to a touch detection unit , Used to perform touch detection based on a touch drive signal; and a light-sensing circuit, disposed on a second substrate of the display panel, electrically connected to a fingerprint recognition unit, used to drive a light-sensing signal Perform fingerprint recognition, wherein the integrated touch display device decides whether to enable the light-sensing drive signal according to the touch drive signal or/and the display drive signal, and the display drive signal or the touch drive signal is consistent When in position, the fingerprint identification unit is used to disable the light-sensing drive signal. The integrated touch display device according to claim 1, wherein the data driving unit, the scanning driving unit, the touch detection unit and the fingerprint recognition unit are an integrated chip. The integrated touch display device according to claim 1, wherein in the frame period, the data driving unit and the scanning driving unit are used to disable the display driving signal, and the touch detection unit is used to disable The touch drive signal. The integrated touch display device according to claim 1, wherein the touch detection unit is used to disable the touch drive signal during a touch period, and the fingerprint recognition unit is used to cause It can drive the light signal. The integrated touch display device according to claim 1, wherein the data driving unit and the scanning driving unit are used to disable the display driving signal during a display period, and the fingerprint identification unit is used to cause It can drive the light signal. The integrated touch display device according to claim 1, wherein the light sensing circuit is used to scan a fingerprint recognition area, the fingerprint recognition unit is used to enable the light sensing driving signal during a touch period, and When one detection area of the touch circuit corresponds to the fingerprint identification area, the fingerprint identification unit is used to disable the light-sensing drive signal. The integrated touch display device according to claim 1, wherein the light-sensing circuit is used to scan a fingerprint recognition area, the fingerprint recognition unit is used to enable the light-sensing driving signal during a display period, and is displayed on the display When a driving area of the panel corresponds to the fingerprint recognition area, the fingerprint recognition unit is used to disable the light-sensing driving signal. The integrated touch display device as described in claim 1 further includes Including: a backlight element, which is arranged at a position corresponding to the display panel in the integrated touch display device, wherein before the fingerprint recognition unit enables the light-sensing driving signal, the backlight element is used to respond to an enhanced signal The fingerprint recognition area projects a backlight. The integrated touch display device according to claim 1, further comprising: a processing circuit for generating a synchronization signal according to the touch driving signal and the display driving signal, so that the fingerprint recognition unit is enabled according to the synchronization signal Or disable the light sensor drive signal. A driving method is applied to an integrated touch display device. The driving method includes: updating a display frame according to a display driving signal through a display panel; performing touch detection based on a touch driving signal through a touch circuit Test; based on the touch drive signal or/and the display drive signal, enable a light-sensitive drive signal to scan a fingerprint recognition area through a light-sensitive circuit; and the display drive signal or the touch drive signal is in When the level is consistent, the light-sensing drive signal is disabled. The driving method according to claim 10, further comprising: disabling the display driving signal and the touch driving signal in a frame period to enable the light-sensing driving signal in the frame period. The driving method according to claim 10, further comprising: disabling the touch driving signal during a touch period, and enabling the light-sensing driving signal during the touch period. The driving method according to claim 10, further comprising: disabling the display driving signal during a display period, and enabling the light-sensitive driving signal during the display period. The driving method according to claim 10, further comprising: enabling the light-sensing driving signal during a touch period, and disabling the driving circuit when a detection area of the touch circuit corresponds to the fingerprint recognition area Light drive signal. The driving method according to claim 10, further comprising: enabling the light-sensitive driving signal during a display period, and disabling the light-sensitive driving when a driving area of the display panel corresponds to the fingerprint recognition area Signal.

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