Driving circuit and display device for superimposed screens

Abstract

The application discloses a driving circuit of a stacked screen and a display device, and belongs to the technical field of display. The stacked screen comprises a main display screen and a secondary display screen, the resolution of the main display screen is higher than that of the secondary display screen, and the driving circuit of the stacked screen comprises a main screen scanning driving circuit, an output end of the main screen scanning driving circuit being connected with the main display screen; a secondary screen scanning driving circuit, an input end of the secondary screen scanning driving circuit being connected with an input end of the main screen scanning driving circuit, the secondary screen scanning driving circuit and the main screen scanning driving circuit sharing a scanning driving control signal; and a logic gate circuit, an input end of the logic gate circuit being connected with an output end of the secondary screen scanning driving circuit, an output end of the logic gate circuit being connected with the secondary display screen, and the logic gate circuit being used for synchronizing the scanning driving speed of the secondary display screen and the main display screen. The application can effectively reduce the driving cost of the stacked screen while ensuring that the scanning driving speeds of the main display screen and the secondary display screen are consistent.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to driving circuits and display devices for stacked screens. Background Technology

[0002] In liquid crystal display panels, since liquid crystals themselves do not emit light, a backlight module is required to provide the light source, which leads to a common light leakage problem in liquid crystal display panels. To solve the light leakage problem, a stacked screen design has been proposed in related technologies. This design separates "light control" from "color display" by using two layers of liquid crystal display panels, and achieves near-ideal optical control through hardware-level optical path reconstruction.

[0003] However, in order to ensure that the data refresh rates of the two LCD panels are consistent, the stacked screen architecture in related technologies requires the control board to send two independent scan drive control signals to the two LCD panels, resulting in high drive costs. Utility Model Content

[0004] The main objective of this application is to provide a driving circuit and display device for stacked screens, aiming to solve the technical problem of reducing the driving cost of stacked screens while ensuring that the data refresh rates of the two liquid crystal display panels are consistent.

[0005] To achieve the above objectives, this application provides a driving circuit for a stacked screen, the stacked screen including a main display screen and a secondary display screen, wherein the resolution of the main display screen is higher than the resolution of the secondary display screen, and the driving circuit for the stacked screen includes:

[0006] A main screen scanning drive circuit, the output of which is connected to the main display screen;

[0007] A secondary screen scanning drive circuit, the input terminal of which is connected to the input terminal of the main screen scanning drive circuit, and the secondary screen scanning drive circuit and the main screen scanning drive circuit share the scanning drive control signal;

[0008] A logic gate circuit is provided, the input of which is connected to the output of the secondary screen scanning drive circuit, and the output of which is connected to the secondary display screen. The logic gate circuit is used to synchronize the scanning drive rates of the secondary display screen and the main display screen.

[0009] In one embodiment, the main screen scanning drive circuit includes multiple main screen scanning drive units, and the secondary screen scanning drive circuit includes multiple secondary screen scanning drive units. The number of main screen scanning drive units and the number of secondary screen scanning drive units are the same as the number of pixel rows of the main display screen.

[0010] In one embodiment, the logic gate circuit includes multiple sets of logic gate units, the number of which is determined based on the number of the sub-screen scanning driving units, the number of pixel rows of the main display screen, and the number of pixel rows of the sub-display screen.

[0011] In one embodiment, the ratio of the number of logic gate units to the number of sub-screen scanning drive units is equal to the ratio of the number of pixel rows of the sub-display to the number of pixel rows of the main display.

[0012] In one embodiment, when the ratio of the number of pixel rows of the secondary display screen to the number of pixel rows of the primary display screen is 1 / N, the input terminal of each group of logic gate units is connected to the output terminal of N groups of secondary screen scanning drive units, where N is a positive integer.

[0013] In one embodiment, the main display screen has 2160 pixel rows, the secondary display screen has 1080 pixel rows, and the input of each set of logic gate units is connected to the output of two sets of secondary screen scanning drive units.

[0014] In one embodiment, the logic gate unit includes an OR gate.

[0015] In one embodiment, the driving circuit for the stacked screen further includes:

[0016] A control board, the output of which is connected to the input of the main screen scanning drive circuit and the input of the secondary screen scanning drive circuit, respectively, and the control board is used to generate the scanning drive control signal.

[0017] In one embodiment, the control panel includes:

[0018] Timing controller;

[0019] A level converter, the input of which is connected to the output of the timing controller, and the output of which is connected to the input of the main screen scanning drive circuit and the input of the secondary screen scanning drive circuit.

[0020] In addition, to achieve the above objectives, this application also provides a display device, which includes a stacked screen and a driving circuit for the stacked screen as described above. The stacked screen includes a main display screen and a secondary display screen, wherein the resolution of the main display screen is higher than that of the secondary display screen, and the main display screen and the secondary display screen are respectively connected to the driving circuit of the stacked screen.

[0021] This application proposes a driving circuit and display device for stacked screens, overcoming the problem of high driving costs in related technologies. The stacked screen includes a main display screen and a secondary display screen, with the main display screen having a higher resolution than the secondary display screen. The driving circuit for the stacked screen includes: a main screen scanning driving circuit, the output of which is connected to the main display screen; a secondary screen scanning driving circuit, the input of which is connected to the input of the main screen scanning driving circuit, and the secondary screen scanning driving circuit and the main screen scanning driving circuit share a scanning driving control signal; and a logic gate circuit, the input of which is connected to the output of the secondary screen scanning driving circuit, and the output of which is connected to the secondary display screen. The logic gate circuit is used to synchronize the scanning driving rates of the secondary display screen and the main display screen.

[0022] In the stacked screen driving circuit provided in this application, the main screen scanning driving circuit and the secondary screen scanning driving circuit share the same set of scanning driving control signals as input signals. Since the resolution of the main display screen is higher than that of the secondary display screen, it is known that the number of pixel rows of the main display screen and the secondary display screen are different. This application adds a logic gate circuit between the output terminal of the secondary screen scanning driving circuit and the secondary display screen. The secondary screen scanning driving signal output by the secondary screen scanning driving circuit is logically processed by the logic gate circuit before being provided to the secondary display screen. This ensures that the scanning driving rate of the main display screen and the secondary display screen is consistent, and there is no need to provide independent scanning driving control signals for the main display screen and the secondary display screen respectively. This eliminates the need for external circuits and wiring to generate additional scanning driving control signals, thereby effectively reducing the driving cost of stacked screens. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a drive circuit for a stacked screen provided in an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of a stacked screen driving architecture in related technologies;

[0026] Figure 3 A detailed structural diagram of the main screen scanning driving circuit and the secondary screen scanning driving circuit in a stacked screen driving circuit provided in an embodiment of this application;

[0027] Figure 4A detailed structural diagram of the main screen scanning driving circuit, the secondary screen scanning driving circuit, and the logic gate circuit in a stacked screen driving circuit provided in an embodiment of this application;

[0028] Figure 5 A timing diagram illustrating the scanning drive signals received by the main display screen and the sub-display screen respectively, according to an embodiment of this application;

[0029] Figure 6 A schematic diagram of a drive circuit for a stacked screen provided in another embodiment of this application;

[0030] Figure 7 This is a detailed structural diagram of the control board in a driving circuit for a stacked screen, provided in one embodiment of this application.

[0031] Explanation of icon numbers:

[0032] 01. Main display screen; 02. Secondary display screen; 10. Main screen scanning drive circuit; 20. Secondary screen scanning drive circuit; 30. Logic gate circuit; 11. Main screen scanning drive unit; 21. Secondary screen scanning drive unit; 31. Logic gate unit; 40. Control board; 41. Timing controller; 42. Level converter.

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] The stacked screen driving circuit and display device provided in this application embodiment are specifically described through the following embodiments, firstly, the stacked screen driving circuit is described.

[0036] This application provides a driving circuit for a stacked screen, referring to... Figure 1 , Figure 1 This is a schematic diagram of a driving circuit for a stacked screen provided in an embodiment of this application. The stacked screen includes a main display screen 01 and a secondary display screen 02. The resolution of the main display screen 01 is higher than that of the secondary display screen 02. The driving circuit for the stacked screen includes:

[0037] Main screen scanning drive circuit 10, the output of main screen scanning drive circuit 10 is connected to main display screen 01;

[0038] The secondary screen scanning drive circuit 20 has its input terminal connected to the input terminal of the main screen scanning drive circuit 10. The secondary screen scanning drive circuit 20 and the main screen scanning drive circuit 10 share the scanning drive control signal.

[0039] The input of logic gate circuit 30 is connected to the output of the sub-screen scanning drive circuit 20, and the output of logic gate circuit 30 is connected to the sub-display screen 02. Logic gate circuit 30 is used to synchronize the scanning drive rates of sub-display screen 02 and main display screen 01.

[0040] In this embodiment, the stacked screen architecture can be combined with Figure 2 To understand, Figure 2 This illustrates a screen-stacking driver architecture in the related technologies. Figure 2 Panel 1 is equivalent to the main display screen 01 in this application, and Panel 2 is equivalent to the secondary display screen 02 in this application. In this stacked screen design architecture, the main display screen 01 is used for "color display", that is, displaying the image, and the secondary display screen 02 is used for "light control", that is, adjusting the amount of light emitted. In this stacked screen, in order not to affect the normal display, it is necessary to ensure that the data refresh rate of the main display screen 01 and the secondary display screen 02 is consistent, that is, it is necessary to synchronize the scanning drive rate of the main display screen 01 and the secondary display screen 02. However, since the resolution of the main display screen 01 and the secondary display screen 02 is inconsistent, it is necessary to distinguish the timing of the scanning drive control signals received by the main display screen 01 and the secondary display screen 02 to ensure that their scanning drive rates are consistent.

[0041] The driving method in related technologies involves the CB (Control Board) sending two independent scan drive control signals to Panel1 and Panel2 respectively. However, this requires the CB to provide independent peripheral circuits for Panel1 and Panel2 to generate their respective scan drive control signals, and to provide two sets of STV (Start of Frame) and CLK (Clock) signals respectively. These signals are then level-converted by two sets of LS (Level Shifters) before being provided to Panel1 and Panel2 respectively. In other words, each display screen needs to generate an independent set of scan drive control signals for control. This driving method obviously leads to higher driving costs.

[0042] In the stacked screen driving circuit provided in this embodiment, it is not necessary to provide separate peripheral circuits for generating their respective scanning drive control signals for the main display screen 01 and the secondary display screen 02. The main screen scanning drive circuit 10 and the secondary screen scanning drive circuit 20 can share the same scanning drive control signal. The main screen scanning drive signal output by the main screen scanning drive circuit 10 can be directly provided to the main display screen 01. However, the secondary screen scanning drive signal output by the secondary screen scanning drive circuit 20 is not directly provided to the secondary display screen 02. Instead, a logic gate circuit 30 is added between the secondary screen scanning drive circuit 20 and the secondary display screen 02. The secondary screen scanning drive signal output by the secondary screen scanning drive circuit 20 is logically processed by the logic gate circuit 30 before being provided to the secondary display screen 02. The driving method provided in this embodiment can also ensure that the scanning drive rate of the main display screen 01 and the secondary display screen 02 is consistent, and it is not necessary to provide separate scanning drive control signals for the main display screen 01 and the secondary display screen 02. This can save the peripheral circuits and wiring used to generate additional scanning drive control signals, thereby effectively reducing the driving cost of stacked screens.

[0043] Reference Figure 3 In some feasible embodiments, the main screen scanning drive circuit 10 includes multiple main screen scanning drive units 11, and the secondary screen scanning drive circuit 20 includes multiple secondary screen scanning drive units 21. The number of main screen scanning drive units 11 and the number of secondary screen scanning drive units 21 are the same as the number of pixel rows of the main display screen 01.

[0044] In this embodiment, the main screen scanning drive circuit 10 and the secondary screen scanning drive circuit 20, which are used to provide scanning drive signals to the main display screen 01 and the secondary display screen 02, have completely identical structures. That is, the number of main screen scanning drive units 11 and secondary screen scanning drive units 21 is the same, and the number of main screen scanning drive units 11 is also the same as the number of pixel rows of the main display screen 01. Each group of main screen scanning drive units 11 is used to provide scanning drive signals to the corresponding rows in the main display screen 01.

[0045] Reference Figure 4 In some feasible embodiments, the logic gate circuit 30 includes multiple sets of logic gate units 31, and the number of logic gate units 31 is determined according to the number of sub-screen scanning driving units 21, the number of pixel rows of the main display screen 01, and the number of pixel rows of the sub-display screen 02.

[0046] In this embodiment, when the resolution of the main display screen 01 is higher than that of the secondary display screen 02, the number of pixel rows of the main display screen 01 is generally also greater than that of the secondary display screen 02. However, the number of the main screen scanning drive unit 11 and the secondary screen scanning drive unit 21 is the same. Therefore, the secondary screen scanning drive unit 21 cannot correspond one-to-one with each scan line in the secondary display screen 02. Instead, it is necessary to connect multiple sets of secondary screen scanning drive units 21 and one scan line in the secondary display screen 02 through logic gate units 31 to achieve the effect of ensuring that the scanning drive rates of the main display screen 01 and the secondary display screen 02 are consistent.

[0047] In this embodiment, the ratio of the number of logic gate units 31 to the number of sub-screen scanning drive units 21 is equal to the ratio of the number of pixel rows of the sub-display 02 to the number of pixel rows of the main display 01. Specifically, when the ratio of the number of pixel rows of the sub-display 02 to the number of pixel rows of the main display 01 is 1 / N, the input terminal of each group of logic gate units 31 is connected to the output terminal of N groups of sub-screen scanning drive units 21, where N is a positive integer.

[0048] As an example, taking the main display screen 01 as a UHD display screen and the secondary display screen 02 as an FHD display screen, since the resolution of the UHD display screen is 3840*2160, the number of pixel rows of the main display screen 01 is 2160. Since the resolution of the FHD display screen is 1920*1080, the number of pixel rows of the secondary display screen 02 is 1080. Therefore, the ratio of the number of pixel rows of the secondary display screen 02 to the number of pixel rows of the main display screen 01 is 1 / 2, that is, N is 2. Thus, it can be seen that the input terminal of each group of logic gate units 31 is connected to the output terminal of the two groups of secondary screen scanning drive units 21.

[0049] In this embodiment, each logic gate unit 31 can be implemented in the form of an OR gate. Taking the main display screen 01 as a UHD display screen and the secondary display screen 02 as an FHD display screen as an example, refer to... Figure 5SCAN(2n-1) and SCAN(2n) can be regarded as the main screen scanning drive signals output by the main screen scanning drive units 11 of the 2n-1 group and the 2n group, or as the sub-screen scanning drive signals output by the sub-screen scanning drive units 21 of the 2n-1 group and the 2n group. For UHD displays, SCAN(2n-1) and SCAN(2n) can be directly provided to the 2n-1 and 2n scan lines in the UHD display; however, for FHD displays, SCAN(2n-1) and SCAN(2n) are first ORed by an OR gate to obtain Gate(n), and then Gate(n) is provided to the nth scan line in the FHD display. In this way, although the main screen scanning drive circuit 10 and the secondary screen scanning drive circuit 20 share the same scanning drive control signal and output the same scanning drive signal, the scanning drive signal output by the main screen scanning drive circuit 10 is directly provided to the UHD display screen, while every two sets of scanning drive signals output by the secondary screen scanning drive circuit 20 are combined into one set through an OR gate before being provided to the FHD display screen. Therefore, for every two lines of the UHD display screen that are turned on, only one line of the FHD display screen is turned on. Since the number of pixel rows of the UHD display screen is twice that of the FHD display screen, when the last two lines of the UHD display screen are turned on, the last line of the FHD display screen is also turned on, thereby achieving the effect of keeping the scanning drive rate of the main display screen 01 and the secondary display screen 02 consistent.

[0050] Reference Figure 6 In some feasible embodiments, the driving circuit for the stacked screen further includes:

[0051] The control board 40 has its output terminals connected to the input terminals of the main screen scanning drive circuit 10 and the secondary screen scanning drive circuit 20, respectively. The control board 40 is used to generate scanning drive control signals.

[0052] In this embodiment, the scan drive control signal can also be generated by the control board 40, but unlike the driving method in related technologies, the control board 40 in this embodiment only needs to generate one scan drive control signal.

[0053] Reference Figure 7 In some feasible embodiments, the control board 40 includes:

[0054] Timing controller 41;

[0055] The level converter 42 has its input terminal connected to the output terminal of the timing controller 41, and its output terminal connected to the input terminal of the main screen scanning drive circuit 10 and the input terminal of the secondary screen scanning drive circuit 20, respectively.

[0056] In this embodiment, the control board 40 may include a timing controller 41, such as a TCON board, and may also include a level converter 42. However, unlike the driving method in related technologies, the TCON board in this embodiment only needs to generate a set of STV and CLK, and perform level conversion on the set of signals through a level converter 42 to obtain a scanning drive control signal that can be provided to both the main screen scanning drive circuit 10 and the secondary screen scanning drive circuit 20 at the same time.

[0057] This embodiment provides a driving circuit for stacked screens, wherein the main screen scanning driving circuit and the secondary screen scanning driving circuit share the same set of scanning driving control signals as input signals. Since the resolution of the main display screen is higher than that of the secondary display screen, it is known that the number of pixel rows of the main display screen and the secondary display screen are different. This application adds a logic gate circuit between the output terminal of the secondary screen scanning driving circuit and the secondary display screen. The secondary screen scanning driving signal output by the secondary screen scanning driving circuit is logically processed by the logic gate circuit before being provided to the secondary display screen. This ensures that the scanning driving rate of the main display screen and the secondary display screen is consistent, and there is no need to provide independent scanning driving control signals for the main display screen and the secondary display screen respectively. This eliminates the need for external circuits and wiring to generate additional scanning driving control signals, thereby effectively reducing the driving cost of stacked screens.

[0058] Furthermore, this application embodiment also provides a display device, which includes a stacked screen and a driving circuit for the stacked screen provided in the above embodiment. The stacked screen includes a main display screen and a secondary display screen, the resolution of the main display screen is higher than the resolution of the secondary display screen, and the main display screen and the secondary display screen are respectively connected to the driving circuit of the stacked screen.

[0059] Since the display device proposed in this embodiment includes the stacked screen driving circuit proposed in the above embodiments, it has the beneficial effects of the above embodiments. For details on the specific working process and principle of the stacked screen driving circuit, please refer to the stacked screen driving circuit provided in the above embodiments. It will not be described in detail here, and all are within the protection scope of this embodiment.

[0060] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0061] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B.

[0062] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] It should also be understood that references to "one embodiment" or "some embodiments" in the specification of embodiments of this application mean that one or more embodiments of this application include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0064] It should be noted that the technical solutions of the various embodiments of this application can be combined with each other, but only if they are implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0065] The above are merely optional embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A driving circuit for stacked screens, characterized in that, The stacked screen includes a main display screen and a secondary display screen, wherein the resolution of the main display screen is higher than that of the secondary display screen, and the driving circuit of the stacked screen includes: A main screen scanning drive circuit, the output of which is connected to the main display screen; A secondary screen scanning drive circuit, the input terminal of which is connected to the input terminal of the main screen scanning drive circuit, and the secondary screen scanning drive circuit and the main screen scanning drive circuit share the scanning drive control signal; A logic gate circuit is provided, the input of which is connected to the output of the secondary screen scanning drive circuit, and the output of which is connected to the secondary display screen. The logic gate circuit is used to synchronize the scanning drive rates of the secondary display screen and the main display screen.

2. The driving circuit for stacked screens as described in claim 1, characterized in that, The main screen scanning drive circuit includes multiple main screen scanning drive units, and the secondary screen scanning drive circuit includes multiple secondary screen scanning drive units. The number of main screen scanning drive units and the number of secondary screen scanning drive units are the same as the number of pixel rows of the main display screen.

3. The driving circuit for stacked screens as described in claim 2, characterized in that, The logic gate circuit includes multiple sets of logic gate units, and the number of logic gate units is determined according to the number of the sub-screen scanning driving units, the number of pixel rows of the main display screen, and the number of pixel rows of the sub-screen screen.

4. The driving circuit for stacked screens as described in claim 3, characterized in that, The ratio of the number of logic gate units to the number of secondary screen scanning drive units is equal to the ratio of the number of pixel rows of the secondary display screen to the number of pixel rows of the main display screen.

5. The driving circuit for stacked screens as described in claim 4, characterized in that, When the ratio of the number of pixel rows of the secondary display screen to the number of pixel rows of the primary display screen is 1 / N, the input terminal of each group of logic gate units is connected to the output terminal of N groups of secondary screen scanning drive units, where N is a positive integer.

6. The driving circuit for stacked screens as described in claim 5, characterized in that, The main display screen has 2160 pixel rows, the secondary display screen has 1080 pixel rows, and the input of each group of logic gate units is connected to the output of two groups of secondary screen scanning drive units.

7. The driving circuit for the stacked screen as described in any one of claims 3 to 6, characterized in that, The logic gate unit includes: an OR gate.

8. The driving circuit for stacked screens as described in claim 1, characterized in that, The driving circuit for the stacked screen also includes: A control board, the output of which is connected to the input of the main screen scanning drive circuit and the input of the secondary screen scanning drive circuit, respectively, and the control board is used to generate the scanning drive control signal.

9. The driving circuit for stacked screens as described in claim 8, characterized in that, The control panel includes: Timing controller; A level converter, the input of which is connected to the output of the timing controller, and the output of which is connected to the input of the main screen scanning drive circuit and the input of the secondary screen scanning drive circuit.

10. A display device, characterized in that, The display device includes a stacked screen and a driving circuit for the stacked screen as described in any one of claims 1 to 9. The stacked screen includes a main display screen and a secondary display screen, wherein the resolution of the main display screen is higher than the resolution of the secondary display screen, and the main display screen and the secondary display screen are respectively connected to the driving circuit of the stacked screen.

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