KR20080083409A - Fingerprinting sensing display panel and fingerprinting sensing display apparatus having the same - Google Patents

Abstract

A fingerprint sensing display panel and a fingerprint sensing display apparatus having the display panel are provided to form a gate driver for image display and a gate driver for sensing a fingerprint in a display panel by using an ASG(Amorphous Silicon Gate) process and embed a lead-out IC(Integrated Circuit) and an analog-to-digital converter for processing fingerprint recognition in a source driver of a display area to achieve a display apparatus integrated with a fingerprint recognition unit. A fingerprint sensing display panel includes a fingerprint display(100), a gate driver, and a data input/output unit(300). The fingerprint display includes an image display unit(100B) and a fingerprint sensing unit(100A). The gate driver includes an image gate electrically connected to the image display unit to control the image display unit and a fingerprint sensing gate electrically connected to the fingerprint sensing unit to control the fingerprint sensing unit. The gate driver is formed by using an ASG(Amorphous Silicon Gate) process at one side of the fingerprint display. The data input/output unit is electrically connected to the fingerprint display and inputs/outputs signals.

Description

Fingerprint display panel and fingerprint recognition display device having same {FINGERPRINTING SENSING DISPLAY PANEL AND FINGERPRINTING SENSING DISPLAY APPARATUS HAVING THE SAME}

1 is a schematic block diagram illustrating a fingerprint recognition display device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view for illustrating an operating principle of the fingerprint recognition display of FIG. 1.

3 is a block diagram illustrating in detail a data input / output unit of the fingerprint recognition display device of FIG. 1.

<Description of the symbols for the main parts of the drawings>

100: fingerprint recognition display 200: gate driver

210: fingerprint recognition gate portion 220: video gate portion

300: data input / output unit 310: image data unit

320: fingerprint recognition data unit 330: signal conversion unit

400: fingerprint display panel 500: main drive unit

The present invention relates to a fingerprint recognition display panel and a fingerprint recognition display device having the same, and more particularly, to a fingerprint recognition display panel and a fingerprint recognition display device having the same for cost reduction and simplifying the structure.

The a-Si thin film transistor liquid crystal display (TFT LCD) is one of flat panel displays (FPDs) and is widely used in monitors, televisions, and mobile terminals. The a-Si TFT LCD includes a plurality of a-Si TFTs arranged in an array and is a display device for actively driving unit pixels using a switching function of the a-Si TFT.

Recently, a TFT LCD having a fingerprint recognition function has been developed using the photosensitive function of a-Si TFT. That is, by combining a fingerprint reader in which a-Si TFTs are arranged in an array form on the surface of the TFT LCD, a TFT LCD having a security function added by recognizing a user's fingerprint can be realized.

Specifically, the fingerprint reader implemented in the TFT LCD includes a sensing unit, a gate IC unit, a sensing detection IC unit, and a printed circuit board.

The sensing unit is formed of unit cells in which a switching TFT and a sensor TFT are connected by a storage capacitor, and are electrically connected to the gate IC unit and the sensing detection IC unit. When the light incident on the fingerprint reader is reflected according to the fingerprint pattern and received in the channel region of the sensor TFT, the sensor TFT is turned on, and the storage capacitor is charged with a charge proportional to the amount of light sensed.

On the other hand, the gate IC section outputs a gate driving signal for turning on the switching TFT every frame set to scan the fingerprint. When the switching TFT is turned on, a voltage proportional to the amount of charge charged in the storage capacitor is output to the sensing detection IC unit through the switching TFT, and the sensing detection IC scans the shape of the fingerprint for each unit cell. In addition, an analog-to-digital converter for converting an analog fingerprint pattern signal output from a sensing detection IC into digital data and a fingerprint recognition processor for receiving a digital fingerprint signal and comparing the fingerprint pattern prestored in a memory are separately formed on the printed circuit board. .

As such, in addition to the IC unit for supplying driving signals to the unit pixels, a gate IC unit and a sensing detection IC unit for outputting a signal sensed by the sensing unit for fingerprint recognition are added, so that a separate chip on glass Process is required. Accordingly, the area of the COG region is increased on the TFT LCD due to the increase in the number of manufacturing processes and the addition of ICs, resulting in side effects such as a reduction in display area and a cost increase for image display.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a fingerprint recognition display panel incorporating a fingerprint reader in a display panel for cost reduction and simplified structure.

Another object of the present invention is to provide a fingerprint recognition display device having the above-described fingerprint recognition display panel.

In order to realize the above object of the present invention, a fingerprint display panel according to an embodiment has a fingerprint recognition display unit having an image display unit and a fingerprint recognition unit displaying an image, and an ASG (Amorphous Silicon Gate) form on one side of the fingerprint recognition display unit. A gate driver configured to be electrically connected to and control the image display unit and a fingerprint recognition gate unit electrically connected to and controlled by the fingerprint recognition unit, and electrically connected to the fingerprint recognition display unit to input and output signals. And a data input / output unit.

In accordance with another aspect of the present invention, a fingerprint recognition display device includes a fingerprint recognition display unit having an image display unit and a fingerprint recognition unit for displaying an image, and an ASG (Amorphous Silicon Gate) type on one side of the fingerprint recognition display unit. A gate driver having an image gate part electrically connected to and controlling the image display part and a fingerprint recognition gate part electrically connected to the fingerprint recognition part, and electrically connected to the fingerprint recognition display part to input and output a signal; A data input / output unit, and a main driver controlling the gate driver and the data input / output unit.

According to the fingerprint display panel and the fingerprint display device having the same, the sensing gate IC for fingerprint recognition is internalized in the display panel, and the source IC and the fingerprint signal output converter are integrated on the same chip, thereby simplifying the manufacturing process and manufacturing cost. Can be further reduced.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the present invention.

1 is a schematic block diagram illustrating a fingerprint recognition display device according to an embodiment of the present invention.

Referring to FIG. 1, the fingerprint recognition display device includes a backlight assembly, a fingerprint recognition display panel 400, and a main driver 500.

The backlight assembly is disposed under the fingerprint display panel 400 to supply light to the fingerprint display panel 400. The backlight assembly may include, for example, a light emitting diode or a lamp as a light source for emitting light.

The fingerprint display panel 400 includes a first substrate, a second substrate facing the first substrate, and a liquid crystal layer interposed between the first substrate and the second substrate.

The first substrate is a transparent substrate through which light is transmitted. A fingerprint recognition display unit 100 for displaying an image, a gate driver 200 and a data input / output unit 300 for driving the fingerprint recognition display unit 100 are formed on the first substrate.

In the fingerprint recognition display unit 100, a plurality of unit pixels defined by signal lines intersecting with each other are arranged in an array form. The unit pixel includes a thin film transistor unit electrically connected to the signal lines, and a pixel electrode made of a transparent conductive material to which the pixel voltage is applied from the data input / output unit 300 by a switching operation of the thin film transistor unit.

As in an embodiment of the present invention, the thin film transistor of the fingerprint recognition display unit 100 is a sensor for detecting light reflected by the fingerprint pattern through the first and second substrates of the light from the backlight assembly Contains wealth. The thin film transistor unit including the sensor unit is electrically connected to the gate driver 200 to receive a driving signal, and electrically connected to the data input / output unit 300 to receive image data and to correspond to the detected fingerprint pattern. Fingerprint signal can be output. Details thereof will be described later.

The sensor unit may be formed in an area where the fingerprint recognition display unit 100 is formed on the first substrate, or alternatively, may be formed in a separate area adjacent to the area where the fingerprint recognition display unit 100 is formed.

The second substrate is a transparent substrate facing the first substrate and transmitting light. A common electrode including an RGB color filter for implementing color and a transparent conductive material facing the pixel electrode is formed on an opposite surface of the second substrate facing the first substrate.

The arrangement of the liquid crystal molecules of the liquid crystal layer is changed by the electric field formed due to the voltage applied to the first substrate and the second substrate. According to the arrangement change of the liquid crystal molecules, the fingerprint display panel 400 may display an image by adjusting the transmittance of light supplied from the backlight assembly.

The main driver 500 is electrically connected to the fingerprint recognition display panel 400 to supply various drive control signals to the gate driver 200 and the data input / output unit 300. The main driver 500 is, for example, mounted on a printed circuit board (PCB), the flexible circuit board 410 is electrically connected to one end of the fingerprint display panel 400 through a FOG (Film On Glass) process It may be electrically connected to the first substrate through.

FIG. 2 is a schematic cross-sectional view for illustrating an operating principle of the fingerprint recognition display of FIG. 1.

1 and 2, the fingerprint recognition display unit 100 is formed on the first substrate 101 constituting the fingerprint recognition display panel 400. The fingerprint recognition display unit 100 includes a plurality of unit pixels defined by gate lines and data lines crossing each other. The unit pixel includes the thin film transistor unit electrically connected to the gate and the data line.

In detail, the thin film transistor unit includes a sensor element 120, a storage capacitor, and a switching element 110 formed on the transparent first substrate 101. That is, the fingerprint recognition display unit 100 may be divided into a fingerprint recognition unit 100A including the sensor element 120 and an image display unit 100B including the switching element 110. In this case, the sensor element 120 and the switching element 110 are electrically connected through the storage capacitor.

The sensor element 120 of the present invention is, for example, made of a photosensitive amorphous Si thin film transistor.

In detail, the sensor element 120 is formed on the first insulating layer 130 to overlap the sensor gate electrode 121, the first insulating layer 130 covering the sensor gate electrode 121, and the sensor gate electrode 121. The photosensitive layer 122 includes a sensor source electrode 123 and a sensor drain electrode 124 formed to be spaced apart from each other via the photosensitive layer 122. The sensor element 120 is covered by the second insulating layer 140 to be protected from the outside.

The photosensitive layer 122 senses the light reflected from the upper surface of the fingerprint recognition display panel 400 by the fingerprint pattern, and when the detected light intensity is greater than or equal to the reference value, between the sensor source electrode 123 and the sensor drain electrode 124. Is electrically connected. For example, the photosensitive layer 122 is preferably made of amorphous silicon (a-Si). Accordingly, when the light reflected by the fingerprint pattern is received by the photosensitive layer 122 made of amorphous silicon, the sensor element 120 may be electrically connected to transmit an electric signal.

The storage capacitor is formed on the first transparent electrode 161, the second insulating layer 140 formed on the first transparent electrode 161, and the second insulating layer 140 to face the first transparent electrode 161. The second transparent electrode 162 is included. The storage capacitor charges a charge in proportion to the amount of light input to the sensor element 120.

The switching element 110 is a semiconductor layer formed on the first insulating layer 130 to overlap the switching gate electrode 111, the first insulating layer 130 covering the switching gate electrode 111, and the switching gate electrode 111. And a switching source electrode 113 and a switching drain electrode 114 formed to be spaced apart from each other via the semiconductor layer 112. The switching element 110 is covered by the second insulating layer 140 to be protected from the outside.

The switching element 110 further includes a light blocking layer 115 formed on the switching source electrode 113 and the switching drain electrode 114 to prevent light from being received by the semiconductor layer 112. The light blocking layer 115 may be formed of, for example, a black organic film material.

In addition, the first substrate 101 is disposed on the second insulating layer 140, the light blocking layer 115, and the second transparent electrode 162 to cover the sensor element 120, the storage capacitor, and the switching element 110. The protective film 150 may be further included. The first and second insulating layers 130 and 140 and the passivation layer 150 may be made of, for example, an insulating material such as silicon nitride or silicon oxide.

In the present exemplary embodiment, the switching element 110 receives an image data signal from the outside and supplies a pixel voltage to the unit pixel. In addition, the switching element 110 receives the fingerprint signal from the sensor element 120, and selectively discharges the charge stored in the storage capacitor according to the driving signal.

That is, when the user closely touches the fingerprint of the finger on the fingerprint recognition display panel 400, the light generated from the backlight assembly disposed below the first substrate 101 is reflected by the fingerprint pattern on the second substrate. The photosensitive layer 122 of the sensor element 120 of the first substrate 101 is received. Accordingly, the sensor element 120 is electrically connected, and the storage capacitor is charged with a charge proportional to the amount of light input, and the switching element 110 supplies a fingerprint pattern signal proportional to the amount of charge to the switching drain electrode 114. Output to the data input and output unit 300 through.

Meanwhile, the sensor element 120 according to the present invention may be formed for each unit pixel in which the switching element 110 is formed, or may be formed only in some unit pixels of the unit pixels. For example, in the case of the fingerprint recognition display unit 100 having a higher resolution, that is, the unit pixel is divided into more subdivisions, the sensor element 120 does not need to be formed in all the unit pixels, and is simplified than the displayed image. It is uniformly formed in the fingerprint recognition display unit 100 only to recognize the fingerprint pattern having a predetermined shape. For example, the sensor element 120 may be formed for each unit pixel group by grouping a plurality of unit pixels.

Meanwhile, as in the exemplary embodiment of the present invention, the gate driver 200 may receive the driving control signal from the main driver 500 to simultaneously drive the fingerprint recognition display 100.

In detail, the gate driver 200 includes a fingerprint recognition gate 210 and an image gate 220, and receives the gate control signal from the main driver 500 to provide the sensor device 120 and the switching device 110. Can be controlled on-off respectively. In the present invention, the fingerprint recognition gate 210 and the image gate 220 are formed on the first substrate 101 through an amorphous silicon gate (ASG) process. For example, the fingerprint recognition gate unit 210 and the image gate unit 220 may be formed to be adjacent to the outside of the fingerprint recognition display unit 100.

The fingerprint recognition gate unit 210 is electrically connected to the sensor element 120 to output a bias voltage for controlling the sensor element 120 on-off. The fingerprint recognition gate unit 210 sequentially outputs a gate driving signal to the gate lines connected to the sensor element 120, thereby turning on the sensor element 120.

The image gate part 220 is electrically connected to the switching element 110 and outputs a bias voltage for on-off control of the switching element 110. The image gate unit 220 switches the switching element 110 every frame set to scan the fingerprint pattern. That is, the image gate part 220 sequentially outputs a gate driving signal to the gate lines connected to the switching element 110, thereby forming a shape of a fingerprint for each sensor element 120 arranged in the fingerprint recognition display part 100. Can be read.

As described above, the gate driver 200 of the present invention is formed of an integrated chip of an IC type, and is not mounted on the first substrate 101 through a separate COG process, but on the fingerprint recognition display panel 400. As internalized through the ASG process, the arrangement relationship between the fingerprint recognition gate unit 210 and the image gate unit 220 may be diversified. For example, when the fingerprint recognition gate unit 210 connected to the sensor element 120 is formed at the center of the image gate unit 220, the fingerprint recognition unit 100A capable of fingerprint recognition including the sensor element 120. May be formed corresponding to the center of the fingerprint recognition display 100 instead of the entire area.

3 is a block diagram illustrating in detail a data input / output unit of the fingerprint recognition display device of FIG. 1.

1, 2, and 3, the sensor element 120 and the switching element 110 are electrically connected to the gate driver 200 and the data input / output unit 300, respectively. In addition, the gate driver 200 and the data input / output unit 300 are electrically connected to the main driver 500 through the flexible circuit board 410.

The main driver 500 according to the present invention includes a timing controller 510 and a fingerprint recognition processor 520.

The timing controller 510 is electrically connected to the gate driver 200 and the data input / output unit 300 to connect the gate driver 200 and the data input / output unit 300 with a clock signal CLK and a sync signal sync. Provide a timing drive control signal.

The fingerprint recognition processor 520 receives a fingerprint signal from the data input / output unit 300 and performs a process required for fingerprint recognition, such as comparing a fingerprint pattern stored in a memory using a currently input fingerprint signal value. . Although not shown in the drawings, a memory for storing an existing fingerprint pattern is connected to the fingerprint recognition processor 520.

In the present embodiment, the data input / output unit 300 receives a data control signal from the timing controller 510, supplies a data signal to the fingerprint recognition display unit 100, reads the fingerprint signal, and outputs the fingerprint signal to the fingerprint recognition processor 520. do. As in an embodiment of the present invention, the data input / output unit 300 includes an image data unit 310 and a fingerprint recognition data unit 320.

For reference, the data input / output unit 300 is electrically connected to the switching drain electrode 114 of the switching element 110 through the data line. The switching source electrode 113 of the switching element 110 is electrically connected to the sensor source electrode 123 of the sensor element 120 through the storage capacitor Cst. On the other hand, the sensor drain electrode 124 of the sensor element 120 is electrically connected to an external power supply device through a data line to receive power.

In detail, the image data unit 310 supplies an image data signal, for example, an RGB signal, to the switching element 110 through the data wires. The image data signal is applied to each of the unit pixels through the turned-on switching element 110. That is, when each switching element 110 is turned on for one frame, the image data unit 310 applies the image data signal to all the unit pixels.

The fingerprint recognition data unit 320 is electrically connected to the switching element 110 to receive a signal sensed by the fingerprint recognition display unit 100 and output an analog fingerprint pattern signal. That is, when the sensor device 120 is turned on, the switching device 110 connected to the sensor device 120 outputs the fingerprint pattern signal corresponding to the sensed light amount to the fingerprint recognition data unit 320.

For example, the image data unit 310 and the fingerprint recognition data unit 320 may be integrally formed in one chip form.

Meanwhile, as in the present invention, the data input / output unit 300 supplies the image data signal to the fingerprint recognition display unit 100 and simultaneously performs a data input / output function of reading the fingerprint pattern signal. In this case, as the image data unit 310 and the fingerprint recognition data unit 320 operate in synchronization, the input of the image data signal and the output of the fingerprint pattern signal are simultaneously performed, thereby minimizing electrical interference between both signals. have.

In addition, the data input / output unit 300 may further include a signal converter 330 electrically connected to the fingerprint recognition data unit 320. The signal converter 330 is an analog-to-digital converter (ADC) for converting the fingerprint pattern signal in an analog form into a fingerprint signal in a digital form. The signal converter 330 outputs the fingerprint signal to the fingerprint recognition processor 520 through the flexible circuit board 410 connected to the main driver 500. For example, the image data unit 310, the fingerprint recognition data unit 320, and the signal converter 330 may be integrally formed in one chip form.

As in the embodiment of the present invention described above, as the data input / output unit 300 is unified including the image data unit 310 and the fingerprint recognition data unit 320, the fingerprint recognition processor 520 is an example. It may be formed on the same printed circuit board (PCB) as the timing controller 510. Accordingly, the main driver 500 mounted on the printed circuit board may be electrically connected to the fingerprint recognition display panel 400 using the single flexible circuit board 410.

According to such a fingerprint recognition display panel and a fingerprint recognition display device having the same, the gate driver of the display area and the gate driver for the fingerprint detection are simultaneously internalized on the display panel using an ASG process, and the fingerprint recognition process is performed on the source driver of the display area. A built-in readout IC and an AD converter may be used to form a display device in which a fingerprint reader is integrated.

Accordingly, a separate IC configuration for fingerprint recognition is unnecessary on the display panel, thereby simplifying the manufacturing process, reducing the manufacturing cost, and compacting the product.

Although the detailed description of the present invention has been described with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art will have the idea of the present invention described in the claims to be described later. It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the invention.

Claims (9)

A fingerprint recognition display unit having an image display unit for displaying an image and a fingerprint recognition unit; A gate driver having an ASG (Amorphous Silicon Gate) formed on one side of the fingerprint recognition display unit, the gate driver having an image gate unit electrically connected to the image display unit to control and a fingerprint recognition gate unit electrically connected to and controlled from the fingerprint recognition unit. ; And And a data input / output unit electrically connected to the fingerprint recognition display unit to input and output a signal. The method of claim 1, wherein the data input and output unit An image data unit electrically connected to the image display unit to drive the image display unit; And And a fingerprint recognition data unit electrically connected to the fingerprint recognition unit and receiving a sensing signal from the fingerprint recognition unit to output an analog fingerprint signal. The fingerprint recognition display panel of claim 2, wherein the image data unit and the fingerprint recognition data unit are integrated in a single chip form. The fingerprint recognition display panel of claim 2, wherein the data input / output unit further comprises a signal conversion unit electrically connected to the fingerprint recognition data unit to convert the analog fingerprint signal into a digital fingerprint signal. The fingerprint recognition display panel of claim 4, wherein the image data unit, the fingerprint recognition data unit, and the signal converter are integrated in a single chip form. The fingerprint recognition display panel of claim 1, wherein the fingerprint recognition unit comprises a photosensitive amorphous Si thin film transistor. A fingerprint recognition display unit having an image display unit for displaying an image and a fingerprint recognition unit; A gate driver having an ASG (Amorphous Silicon Gate) formed on one side of the fingerprint recognition display unit, the gate driver having an image gate unit electrically connected to the image display unit to control and a fingerprint recognition gate unit electrically connected to and controlled from the fingerprint recognition unit. ; A data input / output unit electrically connected to the fingerprint recognition display unit to input / output a signal; And And a main driver configured to control the gate driver and the data input / output unit. The fingerprint recognition display device of claim 7, wherein the main driver further comprises a fingerprint recognition processor which receives a fingerprint signal from the data input / output unit and performs a fingerprint recognition process. The fingerprint recognition display device of claim 8, further comprising a flexible circuit board electrically connecting the data input / output unit and the main driver.

Images