TW202119280A - Fingerprint sensing display panel - Google Patents

Abstract

A fingerprint sensing display panel is disclosed. The fingerprint sensing display panel includes a fingerprint sensing area and a non-fingerprint sensing area. A plurality of fingerprint sensors are disposed in the fingerprint sensing area, which includes a plurality of first sensing signal line in a first direction and a plurality of second sensing signal line in a second direction. A plurality of dummy sensors are disposed in the non-fingerprint sensing area, which includes a plurality of first floating signal line and a plurality of second floating signal line. The plurality of first floating signal line are connected to a first same driving signal line and the plurality of second floating signal line are connected to a second same driving signal line.

Description

Fingerprint sensing display panel

The present invention relates to a fingerprint sensing display panel, in particular to a fingerprint sensing display panel that connects a floating signal line to a co-drive signal line.

In the prior art, many mobile devices will be equipped with various security identification devices, among which biometrics is the main development direction, such as face recognition, fingerprint recognition, palmprint recognition, etc., which can provide users with their own biological characteristics. Improve the safety of the use of the device. Take the smart phones on the market as an example. The touch display panel and fingerprint sensor can be arranged on the same side of the display panel, allowing users to scan the fingerprint directly on the panel, and it can be used in a strip area instead of The single-point area achieves the function of unlocking in a larger area.

In order to make the optical performance of the display panel consistent, the pixels outside the fingerprint sensing area will also be designed with the same virtual pixel pattern as the fingerprint sensor to avoid the difference in aperture ratios at different pixel positions, resulting in uneven display effects. However, under such a design, these virtual pixel patterns will cause the signal to float in the horizontal and vertical directions when the touch signal is operated, which affects the operation of the sensed signal and causes operational problems.

In summary, the conventional fingerprint sensing display panel still has considerable defects in the circuit structure of the virtual pixels. Therefore, the present invention addresses the defects of the prior art by designing a fingerprint sensing display panel structure to ensure The fingerprint-sensing display panel can solve the existing problems, thereby enhancing the implementation and utilization in the industry.

In view of the above-mentioned problems of the prior art, the object of the present invention is to provide a fingerprint sensing display panel with a special wiring structure, thereby solving the problem of floating of the signal lines of the virtual pixels of the existing fingerprint sensing display panel.

According to the above objective, an embodiment of the present invention provides a fingerprint sensing display panel, which includes a fingerprint sensing area and a non-fingerprint sensing area. Wherein, the fingerprint sensing area is provided with a plurality of fingerprint sensors, and the plurality of fingerprint sensors include a plurality of first sensing signal lines in the first direction and a plurality of second sensing signal lines in the second direction. The non-fingerprint sensing area is the area outside the fingerprint sensing area on the fingerprint sensing display panel. The non-fingerprint sensing area is provided with a plurality of virtual sensors. The area outside the test signal line includes a plurality of first floating signal lines, and the area outside the plurality of second sensing signal lines along the second direction includes a plurality of second floating signal lines, and the plurality of first floating signal lines are connected To the first co-drive signal line and the plurality of second floating signal lines are connected to the second co-drive signal line.

In the embodiment of the present invention, a plurality of first floating signal lines can be connected in parallel with the first co-drive signal line, and a plurality of second floating signal lines can be connected in parallel with the second co-drive signal line.

In an embodiment of the present invention, the first co-drive signal line may include a first low-level power line (VGL) disposed on both sides of the fingerprint sensing display panel in the first direction, and the second co-drive signal line may include The second low-level power line (VSS) arranged on both sides of the fingerprint sensing display panel in the second direction.

In an embodiment of the present invention, the first co-drive signal line may include a first high-level power line (VGH) disposed on both sides of the fingerprint sensing display panel in the first direction, and the second co-drive signal line may include The second high-level power supply line (VDD) arranged on both sides of the fingerprint sensing display panel in the second direction.

In the embodiment of the present invention, a plurality of first floating signal lines may form a first low level area and a first high level area on both sides of the fingerprint sensing area in the second direction, and a plurality of second floating signal lines The signal line can form a second low-level area and a second high-level area in the first direction. Among them, the plurality of first floating signal lines in the first low level area are connected to the first low level power line (VGL), and the plurality of first floating signal lines in the first high level area are connected to the first high level. Level power line (VGH), a plurality of second floating signal lines in the second low level area are connected to the second low level power line (VSS) and a plurality of second floating signals in the second high level area The line is connected to the second high-level power supply line (VDD).

In the embodiment of the present invention, the first co-drive signal line and the second co-drive signal line can transmit the co-drive signal to a plurality of first floating signal lines and a plurality of second floating signal lines. The co-drive signal can be a clock signal.

In an embodiment of the present invention, the fingerprint sensing display panel may further include a pixel matrix. The pixels in the pixel matrix respectively include a display area and a non-display area. The display area includes display pixels, a plurality of fingerprint sensors, and a plurality of The virtual sensor is arranged in the non-display area. The display area may include a red pixel area, a green pixel area, and a blue pixel area.

As mentioned above, the fingerprint sensing display panel disclosed in the embodiment of the present invention can be connected to the existing co-drive signal circuit to reduce the problem of floating on the signal circuit of the virtual pixel. At the same time, by connecting to a low-level design, the signal load can be reduced, and the components are not prone to leakage. When connected to a high level, the charging effect is improved, the speed of rising and falling is improved, and the power of the signal is reduced. On the other hand, in other embodiments, high-level and low-level DC power sources can also be connected at the same time, and the wiring method is selected according to the characteristics of the panel to increase design flexibility.

In order to understand the technical features, content and advantages of the present invention as well as the effects that can be achieved, the present invention is described in detail with the accompanying drawings and in the form of embodiment expressions as follows, and the figures used therein are only For the purpose of illustration and supplementary description, it is not necessarily the true scale and precise configuration after the implementation of the invention. Therefore, the scale and configuration relationship of the attached drawings should not be interpreted, and the scope of rights of the invention in actual implementation should not be interpreted. Narrate.

In the drawings, for the sake of clarity, the thickness or width of layers, films, panels, regions, light guides, etc. are exaggerated. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements can also be present. Conversely, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements. As used herein, "connection" can refer to a physical and/or electrical connection. Furthermore, "electrical connection" or "coupling" can mean that there are other elements between the two elements. In addition, it should be understood that although the terms “first”, “second”, and “third” may be used herein to describe various elements, components, regions, layers and/or parts, they are used to refer to an element, component , Region, layer and/or part are distinguished from another element, component, region, layer and/or part. Therefore, it is only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or its sequence relationship.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have meanings commonly understood by ordinary knowledge in the technical field to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of related technologies and the present invention, and will not be interpreted as idealized or excessive The formal meaning, unless explicitly defined as such in this article.

Please refer to FIG. 1A and FIG. 1B at the same time, which are schematic diagrams of the fingerprint sensing display panel according to the embodiment of the present invention. FIG. 1A is a schematic diagram of the fingerprint sensing area 11 of the fingerprint sensing display panel 100, and FIG. 1B is a schematic diagram of the non-fingerprint sensing area 12 of the fingerprint sensing display panel 100. As shown in the figure, the fingerprint sensing display panel 100 is a display panel including a fingerprint sensing function. The fingerprint sensing area 11 as a fingerprint sensing function can be provided on the display panel, and the setting of the fingerprint sensing area 11 can be used as a display In the sensing area under the screen of the device, in this embodiment, the fingerprint sensing area 11 can be arranged on the lower side of the fingerprint sensing display panel 100, so that the user can put his finger on the fingerprint sensing area 11 during operation. A plurality of fingerprint sensors 111 are arranged in the fingerprint sensing area 11, and the fingerprint is transferred through the first sensing signal line S1 arranged horizontally in the first direction x and the second sensing signal line S2 arranged vertically in the second direction y The touch signals of the fingers sensed by the sensor 111, that is, different sensing potential values, are sent to the processing unit for fingerprint recognition, so that the display device can achieve the function of biometric recognition.

At the same time, the non-fingerprint sensing area 12 except for the fingerprint sensing area 11 on the fingerprint sensing display panel 100 is provided with a plurality of virtual sensors 121 in order to make the optical performance of the panel consistent. In detail, the fingerprint sensor display panel 100 has display pixels, touch sensor and fingerprint sensor arranged on the same side of the panel. In order to make the aperture ratio of each pixel of the whole panel consistent, avoid the fingerprint sensor area 11 and the non-fingerprint sensor. The display effect of the sensing area 12 is different. The non-fingerprint sensing area 12 is designed with a virtual sensor 121 having the same pattern as the fingerprint sensor 111 of the fingerprint sensing area 11. Although the pattern of the virtual sensor 121 and its connection line is not activated, when the sensing signal of the fingerprint sensing area 11 is activated, the virtual sensor 121 is located outside the first sensing signal line S1 along the first direction x The first floating signal line F1 included in the area and the second floating signal line F2 included in the area outside the second sensing signal line S2 along the second direction y will affect the sensing due to the large-area floating state. The operation of the test signal. In this embodiment, a plurality of first floating signal lines F1 are connected to a first co-drive signal line A1 that transmits co-drive signals, and a plurality of second floating signal lines F2 are connected to a second co-drive signal line that transmits co-drive signals A2. The co-drive signal, for example, refers to a signal with the same phase and frequency as the touch signal sent to the fingerprint sensing area 111, but its voltage level can be the same or different from the touch signal. The co-drive signal can be The clock signal provided to the fingerprint sensing area 111. In this embodiment, the first co-drive signal line A1 and the second co-drive signal line A2 can simultaneously transmit co-drive signals to a plurality of first floating signal lines F1 and a plurality of second floating signal lines F2, so that The virtual sensor lines in the direction x and the second direction y will not exhibit a floating state.

Please refer to Figure 1B, the first co-drive signal line A1 is arranged on both sides of the fingerprint sensing display panel 100 in the first direction x, and the first floating signal line F1 is connected in parallel to the first co-driver on both sides The signal line A1. In this embodiment, the first floating signal line F1 is connected to the first co-drive signal line A1 on both sides in a staggered manner. However, the present disclosure is not limited to this. The first floating signal line F1 can also be connected continuously To the first co-drive signal line A1 on the left or right. Similarly, the second co-drive signal line A2 is arranged on both sides of the fingerprint sensor display panel 100 in the first direction y, and the second floating signal line F2 is connected to the second co-drive signal line A2 in parallel. In an embodiment, the second floating signal line F2 is respectively connected to the second co-drive signal line A2 on both sides. In other embodiments, the second floating signal line F2 can also be continuously connected to the second co-driver above or below Signal line A2. Since the floating signal lines are respectively connected in series to the same drive signal lines at both ends, the load of the lines can be effectively reduced, and these virtual sensor lines will not appear to float.

Please refer to FIG. 2A and FIG. 2B at the same time, which are schematic diagrams of connecting to a low level according to the embodiment of the present invention. Figure 2A is a schematic diagram of the first floating signal line F1 of the fingerprint sensing display panel 100 in the first direction x, and Figure 2B is a schematic diagram of the second floating signal line F2 of the fingerprint sensing display panel 100 in the second direction y Schematic. Since the first floating signal line F1 in the first direction x and the second floating signal line F2 in the second direction y can be located on different layers during the panel manufacturing process, they must be connected to the same level of low level or high level at the same time. Drive the signal line to avoid the formation of a large area of capacitance between the two layers, which will affect the fingerprint sensing result. The fingerprint sensing display panel 100 includes a fingerprint sensing area 11 and a non-fingerprint sensing area 12, its arrangement and its first sensing signal line S1, second sensing signal line S2, first floating signal line F1, and second The floating signal line F2, etc. are similar to the foregoing embodiment, and the same content will not be described repeatedly. In this embodiment, the first co-drive signal line may include a first low-level power line VGL disposed on both sides of the fingerprint sensing display panel 100 in the first direction x, and the second co-drive signal line may include The fingerprint senses the second low-level power lines VSS on both sides of the display panel 100 in the second direction y.

As shown in the figure, in the first direction x, a plurality of first floating signal lines F1 can be connected in parallel to the first low-level power line VGL, and in the second direction y, a plurality of second floating signal lines F2 can be connected in parallel At the second low level power line VSS. Connecting to the low-level power line has the effect of pulling down the voltage. Since the first low-level power line VGL and the second low-level power line VSS on both sides are respectively connected to the first floating signal line F1 and the second floating signal line F2, The signal load can be reduced to half, making the pull-down effect better, and making the components less prone to leakage.

Please refer to FIG. 3A and FIG. 3B at the same time, which are schematic diagrams of connecting to a high level according to the embodiment of the present invention. Figure 3A is a schematic diagram of the first floating signal line F1 of the fingerprint sensing display panel 100 in the first direction x, and Figure 3B is a schematic diagram of the second floating signal line F2 of the fingerprint sensing display panel 100 in the second direction y Schematic. The fingerprint sensing display panel 100 includes a fingerprint sensing area 11 and a non-fingerprint sensing area 12, its arrangement and its first sensing signal line S1, second sensing signal line S2, first floating signal line F1, and second The floating signal line F2, etc. are similar to the foregoing embodiment, and the same content will not be described repeatedly. In this embodiment, the first co-drive signal line may include the first high-level power line VGH disposed on both sides of the fingerprint sensor display panel 100 in the first direction x, and the second co-drive signal line may include The second high-level power supply line VDD on both sides of the fingerprint sensing display panel 100 in the second direction y.

As shown in the figure, in the first direction x, a plurality of first floating signal lines F1 can be connected in parallel to the first high-level power line VGH, and in the second direction y, a plurality of second floating signal lines F2 can be connected in parallel At the second high level power line VDD. Connecting to the high-level power line can make the capacitance smaller. Because the first high-level power line VGH and the second high-level power line VDD on both sides are connected to the first floating signal line F1 and the second floating signal line F2, respectively, The load of the signal can be reduced to half, making the charging effect better, improving its rising and falling speed, and making the chip push the signal out of the power source smaller.

Please refer to FIG. 4A and FIG. 4B at the same time, which are schematic diagrams of connecting to a low level and a high level at the same time according to an embodiment of the present invention. Figure 4A is a schematic diagram of the first floating signal line F1 of the fingerprint sensing display panel 100 in the first direction x, and Figure 4B is a schematic diagram of the second floating signal line F2 of the fingerprint sensing display panel 100 in the second direction y Schematic. The fingerprint sensing display panel 100 includes a fingerprint sensing area 11 and a non-fingerprint sensing area 12, its arrangement and its first sensing signal line S1, second sensing signal line S2, first floating signal line F1, and second The floating signal line F2, etc. are similar to the foregoing embodiment, and the same content will not be described repeatedly. In this embodiment, the first floating signal line F1 can form a first low-level area LA1 and a first high-level area HA1 on both sides of the fingerprint sensing area 11 in the second direction y, and the second floating signal The line F2 can form a second low-level area LA2 and a second high-level area HA2 in the first direction x. Wherein, the first floating signal F1 line in the first low-level area LA1 is connected to the first low-level power line VGL on both sides of the fingerprint sensing display panel 100, and the first floating signal in the first high-level area HA1 The line F1 is connected to the first high-level power line VGH on both sides of the fingerprint sensing display panel 100. In addition, the second floating signal line F2 in the second low-level area LA2 is connected to the second low-level power line VSS above and below the fingerprint sensing display panel 100, and the second floating signal line in the second high-level area HA2 F2 is connected to the second high-level power line VDD above and below the fingerprint sensing display panel 100.

In this embodiment, the first low-level area LA1 is disposed above the fingerprint sensing area 11, and the first high-level area HA1 is disposed below the fingerprint sensing area 11. However, the present disclosure is not limited to this. In one embodiment, the first low-level area LA1 can be disposed under the fingerprint sensing area 11, and the first high-level area HA1 is disposed above the fingerprint sensing area 11. Similarly, the placement positions of the second low-level area LA2 and the second high-level area LA2 are also interchangeable, which can be adjusted according to the design of the fingerprint sensing display panel 100.

Please refer to FIG. 5, which is a schematic diagram of pixels of a fingerprint sensing display panel according to an embodiment of the present invention. As shown in the figure, the fingerprint sensing display panel may include a pixel matrix composed of a plurality of pixels, which includes pixels 101 in the fingerprint sensing area and pixels 102 in the non-fingerprint sensing area. The fingerprint sensing area pixels 101 and the non-fingerprint sensing area pixels 102 in the pixel matrix respectively include a display area DA and a non-display area NA. The display area DA includes display pixels. In this embodiment, the display pixels include red pixel areas R, Green pixel area G and blue pixel area B. The fingerprint sensor 112 and the virtual sensor 122 are arranged in the non-display area NA, and the sensing control circuit G1 and the display control circuit G2 are also arranged in the non-display area NA. The elements or circuits in the non-display area NA will have the same pattern design, so that the aperture ratio between different pixels is consistent, and the problem of uneven display effect of the panel is avoided.

The above descriptions are merely illustrative and not restrictive. Any equivalent modifications or alterations that do not depart from the spirit and scope of the present invention should be included in the scope of the appended patent application.

11: Fingerprint sensing area 12: Non-fingerprint sensing area 100: Fingerprint sensor display panel 101: Fingerprint sensing area pixels 102: Non-fingerprint sensing area pixels 111, 112: fingerprint sensor 121, 122: virtual sensors A1: The first co-drive signal line A2: The second co-drive signal line DA: display area NA: non-display area F1: The first floating signal line F2: The second floating signal line HA1: The first high level zone HA2: The second highest level area LA1: The first low level area LA2: The second lowest level area S1: The first sensing signal line S2: The second sensing signal line VGH: The first high level power cord VGL: The first low level power line VDD: the second highest level power line VSS: The second lowest level power line x: first direction y: second direction

In order to make the technical features, content and advantages of the present invention and its achievable effects more obvious, the present invention is described in detail in the form of embodiments with the accompanying drawings as follows: FIG. 1A and FIG. 1B are schematic diagrams of a fingerprint sensing display panel according to an embodiment of the present invention. Fig. 2A and Fig. 2B are schematic diagrams of connecting to a low level according to an embodiment of the present invention. 3A and 3B are schematic diagrams of connecting to high level according to the embodiment of the present invention. FIG. 4A and FIG. 4B are schematic diagrams of connecting to the low level and the high level at the same time according to the embodiment of the present invention. FIG. 5 is a schematic diagram of pixels of a fingerprint sensing display panel according to an embodiment of the present invention.

11: Fingerprint sensing area

12: Non-fingerprint sensing area

100: Fingerprint sensor display panel

111: Fingerprint Sensor

121: Virtual Sensor

A1: The first co-drive signal line

A2: The second co-drive signal line

F1: The first floating signal line

F2: The second floating signal line

S1: The first sensing signal line

S2: The second sensing signal line

x: first direction

y: second direction

Claims (10)

A fingerprint sensing display panel, which includes: A fingerprint sensing area is provided with a plurality of fingerprint sensors, and the plurality of fingerprint sensors include a plurality of first sensing signal lines in a first direction and a plurality of second sensors in a second direction Signal line; and A non-fingerprint sensing area is an area outside the fingerprint sensing area on the fingerprint sensing display panel. The non-fingerprint sensing area is provided with a plurality of virtual sensors, and the plurality of virtual sensors are along the first direction The area outside the plurality of first sensing signal lines includes a plurality of first floating signal lines, and the area outside the plurality of second sensing signal lines along the second direction includes a plurality of second floating signal lines , The plurality of first floating signal lines are connected to a first co-drive signal line and the plurality of second floating signal lines are connected to a second co-drive signal line. For the fingerprint sensing display panel described in item 1 of the scope of patent application, wherein the plurality of first floating signal lines are connected in parallel to the first co-drive signal line, and the plurality of second floating signal lines are connected in parallel to the second co-driver signal line Signal line. The fingerprint sensing display panel described in claim 1, wherein the first co-drive signal line includes a first low-level power line arranged on both sides of the fingerprint sensing display panel in the first direction (VGL), the second co-drive signal line includes a second low-level power line (VSS) disposed on both sides of the fingerprint sensing display panel in the second direction. According to the fingerprint sensing display panel described in item 1 of the scope of patent application, the first co-drive signal line includes a first high-level power line arranged on both sides of the fingerprint sensing display panel in the first direction (VGH), the second co-drive signal line includes a second high-level power line (VDD) disposed on both sides of the fingerprint sensing display panel in the second direction. According to the fingerprint sensing display panel described in item 1 of the scope of patent application, the plurality of first floating signal lines form a first low level area and a first low level area on both sides of the fingerprint sensing area in the second direction A first high-level area, and the plurality of second floating signal lines form a second low-level area and a second high-level area in the first direction. For the fingerprint sensing display panel described in item 5 of the scope of patent application, the plurality of first floating signal lines in the first low-level area are connected to a first low-level power line (VGL) and the first low-level power line (VGL) is The plurality of first floating signal lines in a high-level area are connected to a first high-level power line (VGH), and the plurality of second floating signal lines in the second low-level area are connected to a first Two low-level power supply lines (VSS) and the plurality of second floating signal lines in the second high-level area are connected to a second high-level power supply line (VDD). For example, the fingerprint sensing display panel described in item 1 of the scope of patent application, wherein the first co-drive signal line and the second co-drive signal line transmit co-drive signals to the plurality of first floating signal lines and the plurality of second 2. Floating signal line. For the fingerprint sensor display panel described in item 7 of the scope of patent application, the co-drive signal is a clock signal. For example, the fingerprint sensing display panel described in item 1 of the scope of patent application further includes a pixel matrix. A plurality of pixels in the pixel matrix respectively include a display area and a non-display area. The display area includes a display pixel. A plurality of fingerprint sensors and the plurality of virtual sensors are arranged in the non-display area. According to the fingerprint sensing display panel described in claim 9, wherein the display area includes a red pixel area, a green pixel area and a blue pixel area.

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