Display device and driving method thereof

Abstract

The invention provides a display device and a driving method thereof. The display device comprises a first substrate and a second substrate. The first substrate has a first display unit area including a first display unit and a second display unit area including a second display unit. The second display unit area is located on the first side of the first display unit area, and the second display unit is different from the first display unit. The second substrate is at least partially overlapped with the first substrate and is provided with a third display unit area comprising a third display unit. The driving method comprises the following steps: inputting a first signal to the first display unit from a first signal input side of the first substrate; inputting a second signal to the second display unit from the first signal input side; and inputting a third signal from a second signal input side of the second substrate to drive a plurality of third display units on the second substrate.

Description

Technical Field

[0001] The present invention relates to a display device and a driving method thereof; in particular, the present invention relates to a display device capable of reducing dark bands in a display frame. Background Art

[0002] With the continuous advancement of display technology, the product maturity of various display panels is also increasing. Whether it is a liquid crystal display panel, an organic light-emitting diode display panel or a micro-light-emitting diode display panel, the technology has been developed for a long time. However, in the development of large-size display technology, in addition to using a single large-size panel, the use of panel splicing to form a large-size display device is also one of the current mainstream technical trends.

[0003] However, since the display area of ​​each LCD panel does not easily cover the entire frame, when a user views a large-size display device composed of spliced ​​panels, it is easy to notice the seams between the LCD panels. In the prior art, there are attempts to add micro-light-emitting diodes (Micro LEDs) to the edge of one side of the substrate in the LCD panel, but when it is set on the lower substrate, it often causes the wiring density to be too high due to the existing liquid crystal pixel control circuit, which affects the wiring design. When it is set on the upper substrate, it is also easy to make circuit design difficult due to too many wiring. Summary of the invention

[0004] Technical means of solving problems

[0005] To solve the above problem, a display device is provided according to an embodiment of the present invention, which includes a first substrate and a second substrate. The first substrate has a first display unit area including a plurality of first display units and a second display unit area including a plurality of second display units. The second display unit area is located on a first side of the first display unit area, and the second display unit is different from the first display unit. The second substrate is at least partially overlapped with the first substrate and has a third display unit area including a plurality of third display units.

[0006] Another embodiment of the present invention provides a display device driving method, which includes the following steps: inputting a first signal from a first signal input side of a first substrate to at least one first display unit on the first substrate; inputting a second signal from the first signal input side of the first substrate to at least one second display unit on the first substrate, wherein the second display unit is different from the first display unit; and inputting a third signal from a second signal input side of a second substrate at least partially overlapping with the first substrate to drive a plurality of third display units on the second substrate, wherein the second signal input side corresponds to the first signal input side.

[0007] Compare the technical effects of the prior art.

[0008] According to the display device and driving method provided by various embodiments of the present invention, the density of wiring and pads on a single substrate can be dispersed, thereby reducing problems such as poor yield, reduced aperture ratio, or difficulty in circuit signal design caused by over-dense wiring. In addition, the technical solutions proposed in some embodiments can also fill the display dark bands or display gaps between adjacent display unit intervals in different directions to improve the image integrity and user experience of the spliced ​​display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 FIG. 4 is a schematic diagram of an expanded display device according to an embodiment of the present invention.

[0010] Figure 2 for Figure 1 Schematic diagram of the first substrate of the illustrated embodiment.

[0011] Figure 3 for Figure 1 A schematic diagram of a second substrate of the illustrated embodiment.

[0012] Figure 4 for Figure 1 Top view of the illustrated embodiment.

[0013] Figure 5 A schematic diagram of an embodiment of splicing multiple display devices.

[0014] Figure 6 is a schematic diagram of an embodiment of the first substrate.

[0015] Figure 7 is a schematic diagram of an embodiment of the second substrate.

[0016] Figure 8 is a cross-sectional schematic diagram of an embodiment of a display device.

[0017] Fig. 9 FIG. 4 is a schematic diagram of an embodiment of the second display unit area.

[0018] Fig.10 FIG. 4 is a schematic diagram of another embodiment of the second display unit area.

[0019] Fig.11 FIG. 4 is a schematic diagram of another embodiment of the first substrate.

[0020] Fig. 12A FIG. 4 is a schematic diagram of another embodiment of a display device.

[0021] Fig. 12B FIG. 4 is a schematic diagram of another embodiment of a display device.

[0022] Fig.13 The flowchart of an embodiment of a method for driving a display device is shown in FIG.

[0023] Description of reference numerals:

[0024] 10 Display device

[0025] 100 First substrate

[0026] 101 First side

[0027] 102 Second side

[0028] 110 first display unit area

[0029] 111 First display unit

[0030] 120 Second display unit area

[0031] 121 Second display unit

[0032] 1211 First End

[0033] 1212 Second End

[0034] 200 Second substrate

[0035] 230 third display unit area

[0036] 231 Third display unit

[0037] 301 First signal input side

[0038] 302 Second signal input side

[0039] 500 Sector Area

[0040] 510 First transfer area

[0041] 511 First Adapter Pad

[0042] 513 Wire

[0043] 515 First Conducting Pad

[0044] 520 Second transfer area

[0045] 521 Second adapter pad

[0046] 523 Wire

[0047] 525 Second Conducting Pad

[0048] 530 Signal input area

[0049] 533 Wire

[0050] 550 Golden Sphere

[0051] 601 First driving signal source

[0052] 602 second driving signal source

[0053] 610 First signal line

[0054] 620 Second signal line

[0055] 630 Third signal line

[0056] 650 gate signal line DETAILED DESCRIPTION

[0057] Various embodiments will be described below, and those skilled in the art should be able to easily understand the concept and principle of the present invention by referring to the description with the accompanying drawings. However, although some specific embodiments will be described in detail herein, these embodiments are only illustrative and are not to be considered as limiting or exhaustive in all respects. Therefore, for those skilled in the art, various changes and modifications to the present invention should be obvious and easily achievable without departing from the concept and principle of the present invention.

[0058] In the accompanying drawings, for the sake of clarity, the thickness of layers, films, panels, regions, etc. is magnified. Throughout the specification, the same reference numerals represent 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 may be directly on or connected to another element, or an intermediate element may also exist. On the contrary, when an element is referred to as being "directly on" or "directly connected to" another element, there is no intermediate element. As used herein, "connection" may refer to physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" may be other elements between two elements.

[0059] The terms used herein are only for the purpose of describing specific embodiments and are not restrictive. As used herein, unless the content clearly indicates, the singular forms "one", "an" and "the" are intended to include plural forms, including "at least one". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more related listed items. It should also be understood that when used in this specification, the terms "comprising" and / or "including" specify the presence or addition of the features, regions, wholes, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, regions, wholes, steps, operations, elements, parts and / or their combinations.

[0060] Exemplary embodiments are described herein with reference to cross-sectional views that are schematic diagrams of idealized embodiments. Therefore, variations in the shapes of the illustrations as a result of, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the embodiments described herein should not be construed as limited to the specific shapes of the regions as shown herein, but rather include shape deviations that result, for example, from manufacturing. For example, a region shown or described as flat may typically have rough and / or nonlinear features. In addition, the sharp angles shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to illustrate the precise shapes of the regions and are not intended to limit the claims.

[0061] Figure 1 FIG. 1 is an embodiment of a display device. In this embodiment, the display device 10 comprises a first substrate 100 and a second substrate 200; the first substrate 100 and the second substrate 200 are at least partially overlapped with each other. In this embodiment, the first substrate 100 and the second substrate 200 are both made of transparent materials. In addition, the side of the second substrate 200 opposite to the first substrate 100 is the display surface of the display device. Figure 1 and Figure 2 As shown, the first substrate 100 has a first display unit area 110 and a second display unit area 120, and the second display unit area 120 is located on the first side 101 of the first display unit area 110. Specifically, in this embodiment, the first display unit area 110 is located in the central area of ​​the first substrate 100, and the first side 101 where the second display unit area 120 is located is the side of the first display unit area 110 opposite to the first signal input side 301. However, in different embodiments, the first side 101 can also be a side perpendicular to the first signal input side 301. In addition, the first display unit area 110 preferably covers the main area of ​​the first substrate 100 except for the area near the edge; and the second display unit area 120 is preferably distributed in strips and along the first side 101.

[0062] The components in the figure, such as the display units (first, second, third) and the signal lines, are exemplary representations and are presented in a simplified manner for ease of understanding. The number of components can be adjusted according to actual needs and is not limited by the number in the figure.

[0063] like Figure 1 and Figure 2As shown, the first display unit area 110 includes a plurality of first display units 111. In the present embodiment, the first display unit 111 is a pixel of a liquid crystal display panel, which may include a plurality of sub-pixels. However, in different embodiments, the first display unit 111 may also be an organic light emitting diode (OLED), a micro light emitting diode (Micro LED), or other different self-luminous or non-self-luminous display units. The second display unit area 120 includes a plurality of second display units 121 different from the first display unit 111. In the present embodiment, the second display unit 121 is a micro light emitting diode (Micro LED), which may have different colors, such as red, green, and blue. However, in different embodiments, the second display unit 121 may also be an organic light emitting diode (OLED) or other different self-luminous or non-self-luminous display units.

[0064] like Figure 1 and Figure 3 As shown, the second substrate 200 has a third display unit area 230. In this embodiment, the third display unit area 230 is distributed in a strip shape and is located at the side of the second substrate 200. Figure 4 As shown, when the first substrate 100 and the second substrate 200 are overlapped, the vertical projection range of the third display unit area 230 on the first substrate 100 is at least partially located on the second side 102 of the first display unit area 110, and the vertical projection ranges of the second display unit area 120 and the third display unit area 230 on the first substrate 100 do not overlap. In this embodiment, the two ends of the second side 102 are respectively connected to the opposite first side 101 and the first signal input side 301; however, in different embodiments, the positions of the first side 101 and the second side 102 can also be set oppositely.

[0065] The third display unit 231 is a micro light emitting diode (Micro LED), which can have different colors, such as red, green, and blue. However, in different embodiments, the third display unit 231 can also be an organic light emitting diode (OLED) or other different self-luminous or non-self-luminous display units. In addition, in this embodiment, the second display unit 121 and the third display unit 231 are the same type of light emitting display units, but in different embodiments, the two can also be different types of display units.

[0066] exist Figure 4 In the embodiment shown, when the first substrate 100 and the second substrate 200 are overlapped, the vertical projection ranges of the second display unit area 120 and the third display unit area 230 on the first substrate 100 are respectively located at the sides of the first display unit area 110; that is, the second display unit area 120 and the third display unit area 230 are located at the edge of the entire display device. Therefore, when several display devices 10 are adjacent to each other, such as Figure 5As shown, the second display unit area 120 and the third display unit area 230 can be respectively located between the first display unit areas 110 of the display devices 10 adjacent in different directions, thereby filling the display dark bands or display gaps between the display unit areas 110 adjacent in different directions to improve the image integrity and user experience of the spliced ​​display device.

[0067] Figure 6 FIG. 1 is a schematic diagram of an embodiment of the first substrate 100. Figure 6 As shown, the first substrate 100 has a first signal input side 301 and a fan-out area 500 distributed along the first signal input side 301. The fan-out area 500 has a first transfer area 510 and a signal input area 530 that are spaced apart. In this embodiment, the first transfer area 510 and the signal input area 530 are respectively formed by a plurality of wires 513 / 533 arranged side by side, and the wires of both have pads at one end close to the end edge of the first substrate 100. The wires 513 in the first transfer area 510 each have a first transfer pad 511 at the end opposite to the end edge of the first substrate 100. As shown in FIG. Figure 6 As shown, the first transfer pad 511 is located between the first display unit area 110 and the first signal input side 301, that is, it does not enter the display effective area formed by the first display unit area 110. The end of the wire 533 in the signal input area 530 opposite to the first signal input side 301 extends toward the inside of the first substrate 100, thereby forming a first signal line 610 and a second signal line 620, and are respectively electrically connected to each first display unit 111 and each second display unit 121, so as to control or drive each first display unit 111 and each second display unit 121. The pad, transfer pad, conductive pad or similar terms provided herein can be directly formed by the end of the wire; however, in different embodiments, it can also be formed by other conductive elements such as pads and solder pads that are connected externally.

[0068] exist Figure 6 In the illustrated embodiment, a plurality of gate signal lines 650 are arranged on the first substrate 100, corresponding to different columns of the first display units 111. These gate signal lines 650 are arranged side by side and extend in a direction transverse to the first signal lines 610 (e.g., parallel to the first signal input side 301). These gate signal lines 650 are located in different metal layers from the first signal lines 610, but each gate signal line 650 is electrically connected to a first signal line 610, for example, by vias. With this arrangement, the signal transmitted by each signal line 610 can be transmitted to each first display unit 111 on the corresponding column via the corresponding gate signal line 650.

[0069] like Figure 6As shown, the display device includes a first driving signal source 601 and a second driving signal source 602. The first driving signal source 601 and the second driving signal source 602 are electrically connected to the signal input area 530 and the first transfer area 510, respectively, for example, respectively connected to the pads of the wires 513 / 533. The first driving signal source 601 provides a driving signal to the first display unit 111 and the second display unit 121, while the second driving signal source 602 provides a driving signal to the third display unit 231. For example, the first driving signal source 601 can provide a gate signal, which is transmitted to the first display unit 111 on the corresponding column through the first signal line 610 and the gate signal line 650; the first driving signal source 601 can also provide a driving signal at the same time, which is transmitted to the corresponding second display unit 121 through the second signal line 620, so as to control the lighting of the second display unit 121. Furthermore, in this embodiment, the first driving signal source 601 and the second driving signal source 602 are made of chip on film (COF) components, but are not limited thereto. For example, they may also be made of chip on glass (COG) or other methods.

[0070] Figure 7 FIG. 2 is a schematic diagram of an embodiment of the second substrate 200. Figure 7 As shown, the second substrate 200 has a second signal input side 302 corresponding to the first signal input side 301 and at least a second transfer area 520 distributed along the second signal input side 302. The corresponding relationship between the first signal input side 301 and the second signal input side 302 includes but is not limited to that the first signal input side 301 and the second signal input side 302 are located on the same side of the display device, or both are located at the relative positions of the first substrate 100 and the second substrate 200 when they are superimposed. In this embodiment, the second transfer area 520 is formed by a plurality of wires 523 arranged side by side, and the wire 523 has a second transfer pad 521 at one end close to the end edge of the second substrate 200. The other end of the wire 523 extends toward the inside of the second substrate 200 to form a third signal line 630, and is electrically connected to each third display unit 231 to control or drive the third display unit 231.

[0071] exist Figure 7In the illustrated embodiment, the second side 102 where the third display unit area 230 is located is perpendicular to the second signal input side 302, so the third signal line 630 extends from the second signal input side 302 and then bends (for example, 90 degrees) and then extends toward the third display unit area 230, and the third signal line 630 can be located in the same metal layer throughout the entire process without changing layers. However, in different embodiments, the third signal line 630 can also be arranged in a layer-changing manner, for example, the longitudinal and transverse lines are arranged in different layers and then connected by through holes. In different embodiments, when the second side 102 is arranged on the opposite side of the second signal input side 302, the third signal line 630 can also be arranged in a different manner, for example, without bending. In addition, when the first substrate 100 and the second substrate 200 are superimposed, the projection range of the third signal line 630 on the first substrate 100 can be located at or close to the boundary of the first display unit 111, or between adjacent first display units 111, so as to reduce the impact on the overall aperture ratio of the display device.

[0072] Figure 8 FIG. 2 is a cross-sectional view of an embodiment in which a first substrate 100 and a second substrate 200 are overlapped. Figure 8 As shown, the first transfer area 510 and the second transfer area 520 are opposite to each other, and the first transfer pad 511 and the second transfer pad 521 are electrically connected to each other to perform signal transmission between the boards. Specifically, in this embodiment, a gold ball layer 550 is arranged between the first transfer area 510 and the second transfer area 520, and a first conductive pad 515 is arranged on the first transfer pad 511, and a second conductive pad 525 is arranged on the second transfer pad 521. The first conductive pad 515 and the second conductive pad 525 are respectively connected to the upper and lower ends of the gold ball layer 550 to form conduction between the first transfer pad 511 and the second transfer pad 521. The first conductive pad 515 and the second conductive pad 525 are preferably formed of indium tin oxide (ITO). In addition, as Figure 6 As shown, the gold ball layer 550 can be formed into a strip distribution and extend along the first signal input side 301, and can cross the first transfer area 510 and the signal input area 530 that are arranged at intervals. As mentioned above, the first transfer pad 511 and the second transfer pad 521 can be directly formed by the ends of the wires 513 and 523, rather than external pads. However, in different embodiments, the first transfer pad 511 and the second transfer pad 521 can be pads added to the ends of the wires 513 and 523.

[0073] Fig. 9FIG. 1 shows an embodiment of the second display unit area 120. In this embodiment, each second signal line 620 is electrically connected to the first end 1211 of three second display units 121. In this embodiment, the three second display units 121 connected to the same second signal line 620 are respectively micro-LEDs of three different colors, namely red, green, and blue, and the first end 1211 is the P end of the second display unit 121. The second ends, i.e., the N ends, of the three second display units 121 are respectively electrically connected to different common voltage sources Vss1 to Vss3. In other words, every three second display units 121 (for example, red, green, and blue) form a group, each group is connected to a second signal line 620, and the three common voltage sources Vss1 to Vss3 lines are connected to different second display units 121 in each group. Through this arrangement, the number of second signal lines 620 required to be used can be reduced, so as to reduce the difficulty in circuit design and wiring, and to improve the aperture ratio and process yield. Especially when the first signal input side 301 is the short side of the first substrate 100 , the number of circuits can be saved due to limited circuit space.

[0074] Above Fig. 9 The circuit configuration shown can also be used in the circuit design of the third display unit 231 on the second substrate 200 according to the needs. However, in different embodiments, for example Fig.10 In the embodiment shown, different second signal lines 620 may be used to electrically connect different second display units 121, and these second display units 121 are electrically connected to the same common power supply Vss line. For example, when the first signal input side 301 is the long side of the first substrate 100, this design may be used because there is more room for the lines.

[0075] Fig.11 FIG. 1 is another embodiment of the first substrate 100. Fig.11As shown, in addition to providing the second display unit 231 with a driving signal, the second signal line 620 also provides display driving signals (i.e., display data signals) to each first display unit 111 in the same row in a timing sequence. In other words, the second display unit 231 shares a data signal line with the first display unit 111, and the first driving signal source 601 provides a driving signal to the second display unit 231 during the blanking time between the two frames (Frame) displayed before and after the first display unit area 110. The blanking time is much shorter than the display time of one frame of the first display unit area 110. For example, the blanking time may be only 7.7% to 12.2% of a complete frame time (i.e., the blanking time plus the display time of the first display unit area 110). Therefore, the current supplied to the second display unit 121 can be increased to maintain sufficient display brightness of the second display unit 121. By designing that the second display unit 231 shares a common data signal line with the first display unit 111 , the longitudinal lines on the first substrate 100 can be reduced. Therefore, during wiring design, the extra space can be used to increase the number of longitudinal gate signal lines to improve the charging rate of the first display unit 111 .

[0076] Fig. 12A and Fig. 12B Different embodiments of the display device 10 are shown respectively. Fig. 12A In the embodiment, on the first substrate 100, the second display unit area 120 can be arranged on a side perpendicular to the first signal input side 301. On the second substrate 200, the third display unit area 230 is arranged on a side perpendicular to the second signal input side 302 and also on a side opposite to the second signal input side 302. By reducing the number of second display units 121 on the first substrate, the number of first signal lines 620 can be reduced to improve the aperture ratio of the display device.

[0077] Also in Fig. 12B In the embodiment shown, on the first substrate 100, the second display unit 120 can be arranged on a side perpendicular to the first signal input side 301, or can be arranged only at a position closer to the first signal input side 301 to reduce signal delay. On the second substrate 200, the third display unit area 230 is arranged at the side perpendicular to and opposite to the second signal input side 302, and is located at a position farther away from the second signal input side 302. Since the wiring distance between the second signal input side 302 and the third display unit area 230 is long, a wider line width can be used to reduce signal delay. Since the line and component density on the second substrate 200 is low, the restrictions on the use of a wider line design are also small.

[0078] Fig.13 FIG. 2 is a flow chart of an embodiment of a method for driving a display device according to the present invention. Fig.13 and Figure 6 As shown, the driving method includes the following steps. Step 1310 includes inputting a first signal S1, such as a gate control signal, from a first signal input side 301 of the first substrate 100 to the first display unit 111. Step 1330 includes inputting a second signal S2 from the first signal input side 301 to a second display unit 121 on the first substrate, wherein the second display unit 121 is different from the first display unit 111. In one embodiment, Fig. 9 As shown, this step includes inputting the same second signal S2 to the first terminals 1211 of the three second display units 121; and electrically connecting the second terminals 1212 of each of the three second display units 121 to different common voltage sources Vss1-Vss3. In another embodiment, as Fig.11 As shown, the same signal path is used to provide a display driving signal to the first display unit and a second signal S2 to the second display unit in a timing sequence.

[0079] Step 1350 includes inputting a third signal S3 from a second signal input side 302 of a second substrate 200 at least partially overlapping the first substrate 100 to drive a third display unit 231 on the second substrate 200, wherein the second signal input side 302 corresponds to the first signal input side 301, such as Figure 7 In one embodiment, as shown. Figure 8 As shown, this step may include inputting the third signal S3 into the first signal input side 301; and performing inter-board signal transmission between the first transfer area 510 of the first signal input side 301 and the second transfer area 520 of the second signal input side 302 to transmit the third signal S3 to the second signal input side 302.

[0080] The above description is only some preferred embodiments of the present invention. It should be noted that the present invention can be subjected to various changes and modifications without departing from the concept and principle of the present invention. It should be understood by those skilled in the art that the present invention is defined by the appended claims, and that various possible substitutions, combinations, modifications and conversions are within the scope of the present invention as defined by the appended claims.

Claims

1. A display device, comprising: A first substrate having: a first display unit area, comprising a plurality of first display units; and a second display unit area, at least partially located on a first side of the first display unit area, and comprising a plurality of second display units; wherein the second display unit is different from the first display unit; and A second substrate, at least partially stacked with the first substrate, and comprising: A third display unit area, whose vertical projection range on the first substrate is at least partially located on a second side of the first display unit area; wherein the third display unit area includes a plurality of third display units.

2. The display device as claimed in claim 1, wherein the first substrate has a first signal input side and a fan-out area distributed along the first signal input side, the fan-out area including at least a first transfer area; and The second substrate has a second signal input side corresponding to the first signal input side and at least one second transfer area distributed along the second signal input side. The multiple first transfer pads of the first transfer area are respectively electrically connected to the multiple second transfer pads of the second transfer area to perform inter-board signal transmission.

3. The display device as described in claim 2 further has a first driving signal source and a second driving signal source, the fan-connecting area includes at least one signal input area and the at least one first transfer area arranged at intervals; the first driving signal source is electrically connected to the signal input area, and the second driving signal source is electrically connected to the first transfer area.

4. The display device as claimed in claim 1, wherein the first substrate has a first signal input side, the first signal input side and the first side are opposite sides of the first display unit area, and two ends of the second side are respectively connected to the first side and the first signal input side.

5. The display device as claimed in claim 4, wherein the first substrate comprises: A plurality of first signal lines respectively extend from the first signal input side and are respectively electrically connected to the at least one first display unit; and A plurality of second signal lines respectively extend from the first signal input side and are respectively electrically connected to at least one of the second display units.

6. The display device as described in claim 5, wherein the first substrate further has a plurality of gate signal lines, the gate signal lines are in different layers from the first signal lines and extend in directions transverse to the first signal lines respectively; and each of the first signal lines is electrically connected to each of the gate signal lines respectively. 7 . The display device as claimed in claim 5 , wherein each of the second signal lines is electrically connected to a first end of three of the second display units, and a second end of each of the three second display units is connected to a different common voltage source.

8. The display device as claimed in claim 5, wherein each of the second signal lines is electrically connected to a plurality of the first display units at the same time, so as to provide the first display units with display driving signals and the at least one second display unit with display driving signals respectively in a time sequence.

9. A display device, comprising: A first substrate includes a first signal input side; wherein, The first substrate has: a plurality of first display units; A plurality of first signal lines respectively extend from the first signal input side and are respectively electrically connected to at least one of the first display units; a plurality of second display units; wherein the second display units are different from the first display units; and A plurality of second signal lines respectively extending from the first signal input side and respectively electrically connected to at least one of the second display units; A second substrate, at least partially overlapped with the first substrate, and including a second signal input side corresponding to the first signal input side; wherein the second substrate has: a plurality of the third display units; and A plurality of third signal lines respectively extend from the second signal input side and are respectively electrically connected to at least one of the third display units.

10. The display device as claimed in claim 9, wherein the first substrate has a fan-out area distributed along the first signal input side, the fan-out area including at least a first transfer area; and The second substrate has at least one second transfer area distributed along the second signal input side, and the first transfer area is electrically connected to the second transfer area for inter-board signal transmission.

11. The display device as described in claim 10 further has a first driving signal source and a second driving signal source, the fan-connecting area includes at least one signal input area and the at least one first transfer area arranged at intervals; the first driving signal source is electrically connected to the signal input area, and the second driving signal source is electrically connected to the first transfer area.

12. The display device as described in claim 9, wherein the first substrate further has a plurality of gate signal lines, the gate signal lines are in different layers from the first signal lines and extend in directions transverse to the first signal lines respectively; and each of the first signal lines is electrically connected to each of the gate signal lines respectively. 13 . The display device as claimed in claim 9 , wherein each of the second signal lines is electrically connected to a first end of three of the second display units, and a second end of each of the three second display units is connected to a different common voltage source.

14. The display device as claimed in claim 9, wherein each of the second signal lines is electrically connected to a plurality of the first display units at the same time, so as to provide the first display units with display driving signals and the at least one second display unit with display driving signals respectively in a time sequence.

15. A method for driving a display device, comprising the following steps: Inputting a first signal from a first signal input side of a first substrate to at least one first display unit on the first substrate; Inputting a second signal from the first signal input side of the first substrate to at least one second display unit on the first substrate, wherein the second display unit is different from the first display unit; and A third signal is input from a second signal input side of a second substrate at least partially overlapping the first substrate to drive the third display units on the second substrate, wherein the second signal input side corresponds to the first signal input side.

16. The driving method as claimed in claim 15, wherein the third signal input step comprises: inputting the third signal at the first signal input side; and Inter-board signal transmission is performed between a first transfer area on the first signal input side and a second transfer area on the second signal input side to transmit the third signal to the second signal input side. 17 . The driving method as claimed in claim 15 , wherein the first signal inputting step comprises inputting a gate control signal as the first signal.

18. The driving method as claimed in claim 15, wherein the second signal input step comprises: Inputting the same second signal to a first end of the three second display units; and A second end of each of the three second display units is electrically connected to a different common voltage source.

19. The driving method as claimed in claim 15, wherein the second signal input step comprises providing the first display units with display driving signals and providing the at least one second display unit with the second signal in a time sequence respectively through a same signal path.

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