The present invention relates to a device, and in particular to an electronic device having a fingerprint sensing function.
In recent years, fingerprint recognition technology has been widely used in various electronic devices to provide various identity login or authentication functions. At present, the technical principles of conventional fingerprint recognition include optical, capacitive, thermal, ultrasonic, etc. In this regard, since a fingerprint sensor for the above manners is disposed in the electronic device, the fingerprint sensor usually needs to occupy a part of the device volume of the electronic device. The general fingerprint sensor may be, for example, disposed or externally mounted under the screen, the home button, the back of the body, etc. of the electronic device. In other words, the general fingerprint sensor increases the overall device volume or thickness of the electronic device, thereby causing an increase in the manufacturing cost of the electronic device. In view of this, solutions of several embodiments will be provided below.
The present invention is directed to an electronic device that can provide a large-area fingerprint sensing function.
According to an embodiment of the present invention, an electronic device of the present invention includes a touch display panel and an integrated chip. The touch display panel includes a pixel array. The integrated chip is electrically connected to the pixel array. The integrated chip includes a fingerprint sensing circuit and a display driving circuit. The fingerprint sensing circuit and the display driving circuit are electrically connected to a plurality of display data lines and a sensing data line by means of the same pin. The display data lines are respectively electrically connected to a plurality of color sub-pixels of the pixel array. The sensing data line is electrically connected to a plurality of fingerprint sensing pixels of the pixel array. The color sub-pixels are a plurality of organic light emitting diode pixels.
Based on the above, the electronic device of the present invention can realize the full-screen fingerprint sensing function through forming the fingerprint sensing pixels in the pixel array of the touch display panel, and since the fingerprint sensing pixels are embedded in the touch display panel, the electronic device of the present invention can effectively reduce the functional module space required for fingerprint sensing, thereby reducing the overall device volume or thickness of the electronic device.
In order for the features and advantages of the present invention to be more comprehensible, the following specific embodiments are described in detail in conjunction with the drawings.
100: electronic device;
110: touch display panel;
120: pixel array;
130: integrated chip;
131: fingerprint sensing circuit;
131_1: amplifier;
131_2: analog-to-digital converter;
131_3: digital processor;
132: display driving circuit;
132_1: source amplifier;
132_2: timing control circuit;
133: control circuit;
141, 142, 143, 144, 145: demultiplexer;
D1-D4, D6: display data line;
D5: sensing data line;
DS: display driving signal;
G1, G2: gate line;
GS1: scanning signal;
FS: sensing signal;
M1-M_5, S1, S2: switching signal;
N1: pin;
T1-T7: transistor;
t0-t6: time.
Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the drawings. Wherever possible, the same reference numerals are used in the drawings and the description to refer to the same or similar parts.
In the embodiment, the integrated chip 130 may be electrically connected to a plurality of display pixels and a plurality of fingerprint sensing pixels in the pixel array 120 by means of the same pin, and the integrated chip 130 drives a display module of the touch display panel 110 and the touch display panel 110 in a time-sharing manner. In other words, the integrated chip 130 of the embodiment may drive the display module and a fingerprint sensing module in the touch display panel 110 through fewer pins, thereby effectively reducing the space occupied by the pins and wiring in the electronic device 100.
In the embodiment, the electronic device 100 is, for example, a smart phone, a tablet computer, a game console, or other electronic products having a fingerprint recognition function. The touch display panel 110 may include, for example, an organic light emitting diode (OLED) display panel, so a plurality of color sub-pixels of a plurality of pixel units of the pixel array 120 are a plurality of organic light emitting diode pixel units. In detail, in the embodiment, the pixel units of the pixel array 120 may be composed of a plurality of first color sub-pixels, a plurality of second color sub-pixels, a plurality of third color sub-pixels, and a plurality of fingerprint sensing pixels. The first to third color sub-pixels may be, for example, red color sub-pixels, green color sub-pixels, and blue color sub-pixels, but the present invention is not limited thereto. In an embodiment, the pixel units of the pixel array 120 may further include a plurality of fourth color sub-pixels, wherein the fourth color sub-pixels may be, for example, white color sub-pixels, but the present invention is not limited thereto. It should be noted that in the embodiment, the color sub-pixels may be formed on a first semiconductor layer of the touch display panel 110, and the fingerprint sensing pixels may be formed on a second semiconductor layer of the touch display panel 110.
In the embodiment, the gate line G1 may be used to receive a scanning signal to turn on the first color sub-pixel 121, the second color sub-pixel 122, the third color sub-pixel 123, the fourth color sub-pixel 124, and the fingerprint sensing pixel 125. In the embodiment, the display data lines D1 to D4 are used to transmit a plurality of display driving signals (display data) provided by the integrated chip 130 to the first color sub-pixel 121, the second color sub-pixel 122, the third color sub-pixel 123, and the fourth color sub-pixel 124, so that the first color sub-pixel 121, the second color sub-pixel 122, the third color sub-pixel 123, and the fourth color sub-pixel 124 respectively provide a display function according to the corresponding display driving signals (display data). In the embodiment, the sensing data line D5 is used to transmit a sensing signal of the fingerprint sensing pixel 125 to the integrated chip 130, so that the integrated chip 130 may generate a corresponding fingerprint sensing image according to the sensing signal. The arrangement order of the color sub-pixels of the present invention is not limited to the above. Moreover, the placement location of the fingerprint sensing pixel 125 may also be set between any two color sub-pixels.
In the embodiment, the display data lines D1 to D4 and the sensing data line D5 are electrically connected to a row pixel group of the pixel array 120, wherein the row pixel group may include a plurality of pixel units 120P as in the above embodiment of
In the embodiment, the fingerprint sensing circuit 131 includes an amplifier 131_1, an analog-to-digital converter 131_2, and a digital processor 131_3. An input terminal of the amplifier 131_1 is electrically connected to the other terminal of the switch transistor T6. An input terminal of the analog-to-digital converter 131_2 is electrically connected to an output terminal of the amplifier 131_1. The digital processor 131_3 is electrically connected to an output terminal of the analog-to-digital converter 131_2. In the embodiment, the display driving circuit 132 includes a source amplifier 132_1 and a timing control circuit 132_2. An input terminal of the source amplifier 132_1 is electrically connected to the timing control circuit 132_2, and an output terminal of the source amplifier 132_1 is electrically connected to the other terminal of the switch transistor T7. In the embodiment, the pin N1 is electrically connected to the switch transistors T1 to T5 on one side opposite to the pin N1. The switch transistors T1 to T5 are electrically connected to the display data lines D1 to D4 and the sensing data line D5.
In the embodiment, the amplifier 131_1 may receive the sensing signal and provide a sensing signal FS after signal amplification to the analog-to-digital converter 131_2. The analog-to-digital converter 131_2 may provide a digital signal of a fingerprint sensing result to the digital processor 131_3, so that the digital processor 131_3 may generate fingerprint sensing information, for example, generate a fingerprint sensing image, according to the digital signal provided by the analog-to-digital converter 131_2. In the embodiment, the timing control circuit 132_2 of the display driving circuit 132 may provide the timing control signal to the source amplifier 132_1, so that the source amplifier 132_1 outputs a display driving signal DS according to the designed display timing.
In the embodiment, the switch transistor T6 is turned off during the display driving period (the time t0 to the time t5), and the switch transistor T7 is turned on during the display driving period (the time t0 to the time t5). During the display driving period, the display driving period includes four sub-display driving periods, wherein the four sub-display driving periods are respectively from the time t1 to the time t2, from the time t2 to the time t3, from the time t3 to the time t4, and from the time t4 to the time t5. The switch transistors T1 to T4 respectively receive the switching signals M_1 to M_4 during the four sub-display driving periods and are turned on during different periods, and the switch transistor T5 is turned off. Signal waveforms of the switching signals M_1 to M_4 do not overlap in time. Therefore, during the four sub-display driving periods, the display driving circuit 132 respectively outputs first to fourth display driving signals (square waveforms of the display driving signal DS during the four sub-display driving periods as shown in
In this regard, during the display driving period, the display driving circuit 132 may output the display driving signal DS to the color sub-pixels 121 to 124 by means of the display data lines D1 to D4, so that the pixel unit 120P performs the display function. However, it should be noted that the display driving signal DS of
In the embodiment, the switch transistor T5 is turned on during the fingerprint sensing period (the time t5 to the time t6), and the switch transistor T6 is turned off during the fingerprint sensing period (the time t5 to the time t6). During the fingerprint sensing period, the switch transistors T1 to T4 are turned off, and the switch transistor T5 is turned on. The signal waveform of the switching signal M_5 and the signal waveforms of the switching signals M_1 to M_4 do not overlap. Therefore, the fingerprint sensing circuit 131 may receive the sensing signal FS from the fingerprint sensing pixel 125 by means of the sensing data line D5, so that the pixel unit 120P performs the fingerprint sensing function. However, it should be noted that the sensing signal FS of
In summary, the electronic device of the present invention implements an in-cell fingerprint, touch, and display panel structure, and uses the fingerprint, touch, and display driver integrated chip to drive the touch display panel embedded with the fingerprint sensing pixels. Therefore, the electronic device of the present invention can save the space occupied by the driving circuit in the peripheral area of the panel. Alternatively, the integrated chip of the present invention may transmit the display driving signal and the sensing signal by means of the same pin, which can effectively save the space occupied by the pins and wiring in the peripheral area of the panel.
Finally, it should be noted that the above embodiments are only used to illustrate, but not to limit, the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, persons skilled in the art should understand that the technical solutions described in the above embodiments can still be modified or some or all of the technical features thereof can be equivalently replaced. However, the modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2020/123152 | 10/23/2020 | WO |
Number | Date | Country | |
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63016990 | Apr 2020 | US | |
63021082 | May 2020 | US |