Display control system for spliced screen

Abstract

The invention discloses a display control system, which is used for controlling a display screen with a plurality of display areas and comprises a main controller, a plurality of display driving circuits and a plurality of memories. Each of the plurality of display driving circuits is coupled to and controls a corresponding one of the plurality of display areas. Each of the plurality of memories is coupled to a corresponding display driving circuit to store compensation data for the corresponding display area, and the display area is controlled by the corresponding display driving circuit. The display driving circuits are connected in series through a plurality of first transmission channels and connected through at least one second transmission channel, and each first transmission channel is coupled between two of the display driving circuits or coupled between one of the display driving circuits and the main controller.

Description

Technical Field

[0001] The present invention relates to a display control system, and more particularly to a display control system applicable to a splicing screen. Background Art

[0002] In recent years, large-sized display screens are generally implemented by means of a splicing screen. The splicing screen can adopt display technologies such as Liquid Crystal Display (LCD) or Light-Emitting Diode (LED), and can broadcast information to a large number of people at the same time. For example, a digital signboard composed of a light-emitting diode splicing screen can be set in a crowded place to display various information such as advertisements, movies, and traffic conditions to people.

[0003] After the splicing screen is used for a long time, the aging of the light-emitting diodes on the screen may cause the brightness to be inconsistent, thereby reducing the image quality of the displayed image. Therefore, it is necessary to correct or compensate the brightness characteristics of each light-emitting diode pixel. Summary of the Invention

[0004] Therefore, the main object of the present invention is to provide a new display control system applicable to a splicing screen to solve the above problems.

[0005] An embodiment of the present invention discloses a display control system for controlling a display screen. The display screen has a plurality of display areas. The display control system includes a main controller, a plurality of display driving circuits, and a plurality of memories. Each display driving circuit in the plurality of display driving circuits is coupled to a corresponding one of the plurality of display areas to control the corresponding display area. Each memory in the plurality of memories is coupled to a corresponding one of the plurality of display driving circuits to store a compensation data for the corresponding display area, and the display area is controlled by the corresponding display driving circuit. Wherein, the plurality of display driving circuits are connected in series through a plurality of first transmission channels and are connected through at least one second transmission channel, and each first transmission channel in the plurality of first transmission channels is coupled between two of the plurality of display driving circuits or is coupled between one of the plurality of display driving circuits and the main controller.

[0006] Another embodiment of the present invention discloses a display control system for controlling a display screen having a plurality of display areas. The display control system includes a main controller, a plurality of sub-controllers, a plurality of display driving circuits, and a plurality of memories. The plurality of sub-controllers are coupled to the main controller, and each of the sub-controllers is used to control a corresponding one of the plurality of display areas. Each of the plurality of display driving circuits is coupled to one of the plurality of sub-controllers and the display area controlled by the corresponding sub-controller among the plurality of display areas. Each of the plurality of memories is coupled to a corresponding one of the plurality of sub-controllers to store a compensation data for the corresponding display area among the plurality of display areas, and the display area is controlled by the corresponding sub-controller. Wherein, the plurality of sub-controllers are connected in series through a plurality of first transmission channels, and a first sub-controller among the plurality of sub-controllers is coupled to a plurality of first display driving circuits among the plurality of display driving circuits through a second transmission channel and a third transmission channel.

[0007] Another embodiment of the present invention discloses a display control system for controlling a display screen having a plurality of display areas. The display control system includes a main controller, a plurality of display driving circuits, and a plurality of memories. Each of the plurality of display driving circuits is coupled to a corresponding one of the plurality of display areas to control the corresponding display area. Each of the plurality of memories is coupled to a corresponding one of the plurality of display driving circuits to store a compensation data for the corresponding display area, and the display area is controlled by the corresponding display driving circuit. Wherein, the plurality of display driving circuits are connected in series through a plurality of transmission channels, and each of the plurality of transmission channels is coupled between two of the plurality of display driving circuits, or coupled between one of the plurality of display driving circuits and the main controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of a display control system for controlling a tiled screen.

[0009] Figure 2 It is a schematic diagram of a display control system according to Embodiment 1 of the present invention.

[0010] Figure 3 It is a schematic diagram of a display control system according to Embodiment 1 of the present invention.

[0011] Figure 4 It shows that a specific display driving circuit transmits compensation information to the main controller.

[0012] Figure 5 It shows that the display driving circuit transmits compensation information to the main controller in a time-division manner.

[0013] Figure 6 Schematic diagram of the display control system according to the first embodiment of the present invention.

[0014] Figure 7 Schematic diagram of the display control system according to the first embodiment of the present invention.

[0015] Figure 8 Timing diagram of the point-to-point high-speed interface of the transmission channel implemented in the display control system.

[0016] Figure 9 Shows that the display driving circuits on the lamp boards are connected in series to form a tiled screen.

[0017] Figure 10 Schematic diagram of the display control system according to the first embodiment of the present invention.

[0018] Among them, the reference numerals are explained as follows:

[0019] 10, 20, 30, 60, 70, 1000 Display control system

[0020] 100, 200, 300, 600, 700, 1002 Main controller

[0021] LB1_1, LB1_2, LB2_1, LB2_2, Lamp board

[0022] LB3_1, LB3_2, LB6_1, LB6_2,

[0023] LB7_1, LB7_2, LB10_1, LB10_2

[0024] 102_1, 102_2, 202_1, 202_2 Sub-controller

[0025] 104_1, 104_2, 204_1, 204_2, 304_1, Memory 304_2, 604_1, 604_2

[0026] 106_1, 106_2, 206_1, 206_2, 306_1, Display area 306_2, 606_1, 606_2, 706_1, 706_2,

[0027] 1006_1, 1006_2, Z_0~Z_8

[0028] 108_1, 108_2, 208_1, 208_2, 308_1, Control circuit 308_2, 608_1, 608_2, 708_1, 708_2,

[0029] 1008_1, 1008_2

[0030] DIC_A1 to DIC_AN, DIC_B1 to display driver circuit

[0031] DIC_BN, DIC_C1 to DIC_CN,

[0032] DIC_D1 to DIC_DN, 302_1, 302_2,

[0033] D_1 to D_M, 602_1, 602_2, 702_1,

[0034] 702_2, D_0 to D_8, 1004_1, 1004_2

[0035] DAT, DAT1 to DAT4 display data

[0036] C_DAT compensation data

[0037] CH1, CH2, CH0, CH transmission channels

[0038] C_INFO, C_INFO1 to C_INFO4 compensation information

[0039] CMD1 to CMD4 instructions

[0040] 90 splicing screens Detailed implementation manners

[0041] A splicing screen is usually composed of multiple lamp boards, where each lamp board has a display area, a data splitter, and / or one or more drivers and controllers. The drivers and controllers can be used to drive and control the display area to display images. The data splitter can be implemented on each lamp board or on the video source used to transmit video data, and can be used to split and distribute video data to each segment on the splicing screen for display.

[0042] Figure 1Schematic diagram of a display control system 10 for controlling a tiled screen. The display control system 10 includes a main controller 100 and a plurality of light boards LB1_1, LB1_2,.... Each light board LB1_1, LB1_2 may include a display area 106_1, 106_2 and a control circuit 108_1, 108_2 disposed on a circuit board, which may be a printed circuit board (PCB), but is not limited thereto. Each display area 106_1, 106_2 may include a plurality of light-emitting components arranged in an array, where each light-emitting component may be a light-emitting diode (LED) or an organic light-emitting diode (OLED), but is not limited thereto. Each light board may be a part of a tiled screen of a display screen, which may be, for example, a light-emitting diode panel, a mini-LED panel, a micro-LED panel, an ultra-LED panel, or an organic light-emitting diode panel. For example, a tiled screen of a display screen (such as a large-sized digital signage installed outdoors or indoors) may be constructed by combining the display areas of a large number of light boards.

[0043] The display control system 10 may include a large number of light boards connected to each other. For the sake of simplicity, Figure 1 only two light boards LB1_1 and LB1_2 are shown. The light boards LB1_1 and LB1_2 are controlled by the main controller 100. Specifically, the main controller 100 may be implemented on a printed circuit board and may serve as a video source for outputting display data DAT to the light boards LB1_1 and LB1_2. In one embodiment, the main controller 100 may be a transmitting card, which may be used to generate and output display data DAT in a format that can be received by the light boards LB1_1 and LB1_2.

[0044] Each light board LB1_1 and LB1_2 may include a sub - controller 102_1 and 102_2, a memory 104_1 and 104_2, and a plurality of display driving circuits DIC_A1 to DIC_AN and DIC_B1 to DIC_BN. The sub - controllers 102_1 and 102_2 on different light boards may be cascaded with each other, connecting from the main controller 100 to the sub - controller (such as 102_2) on the last light board. The main controller 100 may transmit the display data DAT of a complete image frame to the cascaded sub - controllers 102_1 and 102_2. More specifically, under the cascaded structure, the main controller 100 may output the display data DAT to the sub - controller 102_1 on the first light board LB1_1, and the sub - controller 102_1 on the first light board LB1_1 may transmit the display data DAT to the sub - controller 102_2 on the second light board LB1_2, and the sub - controller 102_2 on the second light board LB1_2 then transmits the display data DAT to the sub - controller on the third light board, and so on. The sub - controllers 102_1 and 102_2 on each light board LB1_1 and LB1_2 may analyze the instructions or parameters related to the display data DAT to identify the display data DAT for themselves. Therefore, each sub - controller 102_1 and 102_2 may obtain the display data DAT of the corresponding display areas 106_1 and 106_2, and output the display data DAT to the corresponding display driving circuits DIC_A1 to DIC_AN and DIC_B1 to DIC_BN. If the display data DAT is not for the display areas 106_1 and 106_2 controlled by the sub - controllers 102_1 and 102_2, it may transmit the display data DAT to the subsequent light board and its sub - controller.

[0045] The memories 104_1 and 104_2 may store the compensation data C_DAT for the display areas 106_1 and 106_2, and the display areas 106_1 and 106_2 are controlled by the corresponding sub - controllers 102_1 and 102_2. The compensation data C_DAT may include moiré compensation (Demura) data, but is not limited thereto. In one embodiment, the memories 104_1 and 104_2 may be a flash memory, but is not limited thereto.

[0046] Each display driving circuit DIC_A1 - DIC_AN and DIC_B1 - DIC_BN is coupled between the sub - controller 102_1 or 102_2 and the corresponding display area 106_1 or 106_2, and is responsible for driving one of the display areas 106_1 or 106_2. For example, the display area 106_1 on the lamp board LB1_1 can be divided into 6 areas, and the lamp board LB1_1 includes 6 display driving circuits DIC_A1 - DIC_A6, which are respectively used to control these 6 areas. As Figure 1 shown, the sub - controllers 102_1, 102_2 are coupled to each driving circuit DIC_A1 - DIC_AN, DIC_B1 - DIC_BN through a transmission channel CH1, and are used to output the display data DAT of each area to the corresponding driving circuits DIC_A1 - DIC_AN, DIC_B1 - DIC_BN through the transmission channel CH1. The display driving circuits DIC_A1 - DIC_AN, DIC_B1 - DIC_BN can convert the display data DAT into a data voltage and output the data voltage to the corresponding areas in the display areas 106_1, 106_2. In one embodiment, each display driving circuit DIC_A1 - DIC_AN and DIC_B1 - DIC_BN can be implemented in an integrated circuit (IC) to implement a display driver integrated circuit (Display Driver IC, DDIC). The structure of the display driving circuit or the display driver integrated circuit should be well - known to those skilled in the art and will not be described in detail here.

[0047] Figure 2 It is a schematic diagram of a display control system 20 according to an embodiment of the present invention. The display control system 20 also includes a main controller 200 and a plurality of lamp boards LB2_1 and LB2_2. Each lamp board LB2_1 and LB2_2 is used to form a display area 206_1, 206_2, and includes a sub - controller 202_1 and 202_2, a memory 204_1 and 204_2, and a plurality of display driving circuits DIC_C1 - DIC_CN and DIC_D1 - DIC_DN disposed on the printed circuit board, as control circuits 208_1, 208_2 on the circuit board.

[0048] Similarly, the sub - controllers 202_1, 202_2 on each lamp board LB2_1, LB2_2 are connected in series with each other, and the sub - controller 202_1 on the first lamp board LB2_1 is also connected to the main controller 200. The sub - controllers 202_1 and 202_2 can be used to control the corresponding display areas 206_1 and 206_2 and provide the display data DAT to the display areas 206_1 and 206_2. More specifically, as Figure 2As shown, sub - controllers 202_1 and 202_2 are connected in series through a plurality of transmission channels CH0. That is to say, each transmission channel CH0 can be coupled between two sub - controllers (such as 202_1 and 202_2), or coupled between sub - controller 202_1 and main controller 200. The transmission channel CH0 can be used to transmit display data DAT to each of the sub - controllers 202_1 and 202_2.

[0049] Memories 204_1, 204_2 can be used to store compensation data C_DAT (such as moire compensation data) for display areas 206_1, 206_2. The display areas 206_1, 206_2 are respectively controlled by sub - controllers 202_1, 202_2. For example, before the tiled - screen product of the display control system 20 starts to be used, the product manufacturer can first measure each light - emitting diode on the light - board LB2_1 or LB2_2 to obtain its luminous efficiency. According to the luminous efficiency of each light - emitting diode, relevant moire compensation data can be obtained. The moire compensation data can be used to compensate for the inconsistent brightness of the light - emitting diodes (also known as "Mura"), so that all the light - emitting diodes on the light - boards LB2_1 and LB2_2 can produce consistent brightness under the same data voltage.

[0050] Display driving circuits DIC_C1~DIC_CN, DIC_D1~DIC_DN are coupled between sub - controllers 202_1, 202_2 and their corresponding display areas 206_1, 206_2. Different from the display control system 10 where its sub - controller 102_1 or 102_2 is only coupled to each driving circuit DIC_A1~DIC_AN or DIC_B1~DIC_BN through a single transmission channel CH1, in Figure 2 the display control system 20, sub - controllers 202_1, 202_2 can be coupled to each display driving circuit DIC_C1~DIC_CN, DIC_D1~DIC_DN through two transmission channels CH1 and CH2. The transmission channel CH1 can transmit display data DAT from sub - controllers 202_1, 202_2 to the corresponding display driving circuits DIC_C1~DIC_CN, DIC_D1~DIC_DN, while the transmission channel CH2 can transmit compensation information C_INFO from the corresponding display driving circuits DIC_C1~DIC_CN, DIC_D1~DIC_DN to sub - controllers 202_1, 202_2. In one embodiment, the transmission channel CH2 can include a multi - drop interface, that is, the transmission channel CH2 can be a multi - branch bus with multiple endpoints, where one endpoint is connected to sub - controller 202_1 or 202_2, and the other endpoints are respectively connected to one of the display driving circuits DIC_C1~DIC_CN or DIC_D1~DIC_DN.

[0051] In one embodiment, the compensation information C_INFO transmitted through the transmission channel CH2 may include moiré compensation information and / or abnormal information in the corresponding display areas 206_1 or 206_2. Each display driving circuit DIC_C1 to DIC_CN or DIC_D1 to DIC_DN may be used to detect the states of the light-emitting diodes in its responsible area, obtain the relevant compensation information C_INFO, and transmit the compensation information C_INFO to the sub-controller 202_1 or 202_2 through the transmission channel CH2.

[0052] The moiré compensation information is for moiré compensation of the display areas 206_1 and 206_2. As described above, before the product starts to be used, moiré compensation data for compensating for luminance non-uniformity can be obtained first and stored in the memories 204_1 and 204_2. During the use of the product, each light-emitting diode on the lamp boards LB2_1 and LB2_2 will still experience different degrees of aging, resulting in different degrees of attenuation of luminous efficiency and / or change in critical voltage. This attenuation and / or change may cause additional luminance non-uniformity, and the moiré compensation information regarding the luminance non-uniformity can be transmitted from the display driving circuits DIC_C1 to DIC_CN, DIC_D1 to DIC_DN to the sub-controllers 202_1 and 202_2 through the transmission channel CH2.

[0053] In addition, the abnormal information is about abnormal conditions on the lamp boards LB2_1 and LB2_2. For example, the display driving circuits DIC_C1 to DIC_CN, DIC_D1 to DIC_DN may detect that a data line and / or a scan line is abnormally short-circuited or open-circuited, or detect that any light-emitting diode has abnormal light-emitting characteristics. After the display driving circuits DIC_C1 to DIC_CN, DIC_D1 to DIC_DN detect any abnormal conditions, the relevant abnormal information can be transmitted to the sub-controllers 202_1 and 202_2 through the transmission channel CH2.

[0054] Therefore, the sub-controllers 202_1 and 202_2 on each of the lamp boards LB2_1 and LB2_2 can collect the compensation information C_INFO from the display driving circuits DIC_C1 to DIC_CN, DIC_D1 to DIC_DN, and transmit the compensation information C_INFO to the front-end main controller 200, such as through the transmission channel CH0.

[0055] In the prior art, in order to handle the aging of light-emitting diodes and abnormal conditions of the lamp board, product manufacturers need to use a camera to capture the screen display and manually diagnose it. If an abnormal lamp board appears on the splicing screen, the lamp board needs to be removed for detailed inspection and repair. In contrast, the display control system of the present invention provides a feedback channel (i.e., transmission channel CH2), which can be used to transmit compensation information indicating abnormal conditions and moiré phenomena to the main controller. In this case, the user can perform remote diagnosis and solve the problems of the splicing screen through the main controller, and this solution is more efficient and cost-saving.

[0056] Since the transmission channel CH2 is implemented through a multi-branch interface, where all the display driving circuits DIC_C1~DIC_CN or DIC_D1~DIC_DN share the same transmission bus, the display driving circuits DIC_C1~DIC_CN, DIC_D1~DIC_DN can output the compensation information C_INFO to the sub-controllers 202_1, 202_2 in a time-sharing manner.

[0057] It should be noted that a splicing screen may include a large number of lamp boards, and each lamp board has a sub-controller, which is coupled to several display driving circuits to control the corresponding display area. Therefore, the splicing screen includes a very large number of integrated circuits, which include sub-controllers and display driving circuits, and the sub-controllers need to include a large number of connection ports to connect to the display driving circuits. To save circuit costs, the structure of the lamp board can be further simplified. In an embodiment, the sub-controller on the lamp board can be omitted to simplify the circuit structure and save circuit costs.

[0058] Figure 3 FIG. 30 is a schematic diagram of a display control system 30 according to an embodiment of the present invention. The display control system 30 includes a main controller 300 and a plurality of lamp boards LB3_1, LB3_2. Each lamp board LB3_1, LB3_2 is used to form a display area 306_1, 306_2, and includes a display driving circuit 302_1, 302_2 and a memory 304_1, 304_2 disposed on a printed circuit board, serving as control circuits 308_1, 308_2 on the circuit board. The operation of the main controller 300 is similar to that of the main controller 100 or 200, which will not be described in detail here. The operation of the memories 304_1 and 304_2 is also similar to the foregoing description, that is, the memories 304_1, 304_2 can be used to store compensation data C_DAT for the corresponding display areas 306_1, 306_2.

[0059] In this example, the display driving circuits 302_1 and 302_2 can be used to implement the functions of the display driving circuits DIC_C1 to DIC_CN and the sub-controller 202_1, as well as the display driving circuits DIC_D1 to DIC_DN and the sub-controller 202_2 in the display control system 20, respectively. Therefore, the structures and costs of each lamp board LB3_1 and LB3_2 can be omitted. For example, in the display control system 20, there are 6 display driving circuits, which are respectively used to output data voltages to 6 regions of a display area. In contrast, in the display control system 30, the display driving circuits 302_1 and 302_2 can be used to output data voltages to the entire display areas 306_1 and 306_2, which is equivalent to 6 times the amount of output data. The number of integrated circuits on each lamp board LB3_1 and LB3_2 can be saved, and at the same time, the complex wiring connections between the sub-controller and a large number of display driving circuits are reduced.

[0060] Generally speaking, a large-sized tiled screen usually includes hundreds of lamp boards. Since each lamp board is provided with only one display driving circuit to replace a sub-controller and multiple display driving circuits, the total number of integrated circuits included in the display control system 30 used to control the tiled screen is significantly reduced. Correspondingly, the connection lines and input / output terminals between different integrated circuits are also reduced, thereby reducing the number of layers to be provided on the printed circuit board and reducing power consumption at the same time. In this case, the structural simplification of the lamp boards LB3_1 and LB3_2 can bring great improvements to all aspects of the tiled screen.

[0061] As Figure 3 shown, the display driving circuits 302_1 and 302_2 on different lamp boards LB3_1 and LB3_2 are connected in series through the transmission channels CH1 and CH2. The transmission channel CH1 can be used to transmit the display data DAT, and the transmission channel CH2 can be used to transmit the compensation information C_INFO.

[0062] Specifically, each transmission channel CH1 can be coupled between two display driving circuits (such as 302_1 and 302_2), or coupled between the display driving circuit 302_1 and the main controller 300. The transmission channel CH1 can transmit display data DAT from the main controller 300 to the display driving circuits 302_1 and 302_2 on each light board LB3_1 and LB3_2. More specifically, the main controller 300 can output the display data DAT to the display driving circuit 302_1 on the first light board LB3_1, and the display driving circuit 302_1 on the first light board LB3_1 can transmit the display data DAT to the display driving circuit 302_2 on the second light board LB3_2, and the display driving circuit 302_2 on the second light board LB3_2 can then transmit the display data DAT to the display driving circuit on the third light board, and so on. In this example, since the sub-controller is omitted, the main controller 300 can transmit the display data DAT to each of the display driving circuits 302_1 and 302_2 without passing through the sub-controller. The display driving circuits 302_1 and 302_2 can identify whether the received display data DAT is for themselves. According to the identification result, if the display data DAT is for themselves, the display driving circuits 302_1 and 302_2 can process the display data DAT and convert the display data DAT into a data voltage to output to the corresponding display areas 306_1 and 306_2; or the display driving circuits 302_1 and 302_2 can transmit the display data DAT to the subsequent display driving circuit when it is determined that the display data DAT is not for themselves.

[0063] The transmission channel CH2 can transmit compensation information C_INFO from the corresponding display driving circuits 302_1 and 302_2 to the main controller 300. More specifically, the display driving circuit 302_1 on the first light board LB3_1 can transmit the compensation information C_INFO to the display driving circuit 302_2 on the second light board LB3_2, and the display driving circuit 302_2 on the second light board LB3_2 can transmit the compensation information C_INFO to the display driving circuit on the third light board, and so on. The display driving circuit on the last light board can collect the compensation information C_INFO of all the light boards and transmit all the compensation information to the main controller 300. Similarly, the display driving circuits 302_1 and 302_2 can transmit the compensation information C_INFO to the main controller 300 without passing through the sub-controller. The compensation information C_INFO can include at least one of moiré compensation information and abnormal information, and its related implementation manners are similar to the foregoing description and will not be elaborated here.

[0064] In this example, both the transmission channels CH1 and CH2 are implemented in a cascaded manner. In this case, each light board LB3_1, LB3_2 only needs to be connected to its adjacent two light boards through wires. Since the transmission channel CH2 used to transmit compensation information does not use a multi-branch bus, the connection lines of the transmission channel CH2 may not intersect with the connection lines of the transmission channel CH1, thus reducing the layout complexity and saving the number of layers of the printed circuit board.

[0065] The compensation information C_INFO can be transmitted to the main controller 300 in any suitable manner. In one embodiment, the compensation information C_INFO of a specific light board can be transmitted through the transmission channel CH2. For example, assume that there are M light boards in a display control system, and the display driving circuits D_1~D_M on the light boards can be cascaded through the transmission channel CH2 to transmit the compensation information C_INFO, and the display driving circuit D_M on the last light board is also coupled to the main controller. Figure 4 It shows that a specific display driving circuit transmits the compensation information C_INFO to the main controller. For example, the display driving circuit D_2 detects an abnormal condition in its corresponding display area, and thus transmits the abnormal information to the main controller. The compensation information C_INFO is output by the display driving circuit D_2, and then relayed through the display driving circuits D_3 to D_M, and finally reaches the main controller.

[0066] In another embodiment, the compensation information of each display driving circuit D_1~D_M can be transmitted to the main controller in a time-division manner, as Figure 5 shown. For example, the main controller broadcasts an instruction to the display driving circuits D_1~D_M to instruct the display driving circuits D_1~D_M to return relevant status or information. Correspondingly, the display driving circuits D_1~D_M can transmit the compensation information C_INFO in a time-division manner through the transmission channel CH2. In this case, the time interval of the transmission channel CH2 can be divided into multiple time slots, and each time slot is used to transmit the compensation information C_INFO of a corresponding light board. Under appropriate timing arrangements, the main controller can receive the compensation information C_INFO of all light boards.

[0067] In another embodiment, in order to further save circuit costs, the circuit structure of the light board can be further simplified. For example, Figure 6 is a schematic diagram of a display control system 60 according to an embodiment of the present invention, which integrates the transmission channels CH1 and CH2 in the display control system 30. As Figure 6As shown, the display control system 60 includes a main controller 600 and a plurality of lamp boards LB6_1 and LB6_2. Each of the lamp boards LB6_1 and LB6_2 is used to form a display area 606_1 and 606_2, and includes a display driving circuit 602_1 and 602_2, and a memory 604_1 and 604_2, which are respectively provided as control circuits 608_1 and 608_2 on a circuit board (such as a printed circuit board). The operation of the main controller 600, the display driving circuits 602_1 and 602_2, and the memories 604_1 and 604_2 is similar to that of the main controller 300, the display driving circuits 302_1 and 302_2, and the memories 304_1 and 304_2, and will not be described in detail here.

[0068] Different from the display control system 30 in which every two adjacent display driving circuits (such as 302_1 and 302_2) are connected through two transmission channels CH1 and CH2, in the display control system 60, every two adjacent display driving circuits (such as 602_1 and 602_2) are only connected through one transmission channel CH. In this case, all the display driving circuits included in the display control system 60 are connected in series through the transmission channel CH, and each transmission channel CH can be coupled between two display driving circuits (such as 602_1 and 602_2), or coupled between the display driving circuit 602_1 and the main controller 600. The transmission channel CH can transmit the display data DAT from the main controller 600 to the corresponding display driving circuits 602_1 and 602_2, and can also transmit the compensation information C_INFO from the display driving circuits 602_1 and 602_2 to the main controller 600.

[0069] In another embodiment, the circuit structure of the lamp board can be further simplified by integrating the display driving circuit and the memory. For example, Figure 7 is a schematic diagram of a display control system 70 according to an embodiment of the present invention. The display control system 70 includes a main controller 700 and a plurality of lamp boards LB7_1 and LB7_2. Each of the lamp boards LB7_1 and LB7_2 is used to form a display area 706_1 and 706_2, and includes a display driving circuit 702_1 and 702_2, which are respectively provided as control circuits 708_1 and 708_2 on a circuit board (such as a printed circuit board). In this example, the memory for storing the compensation data C_DAT of the light-emitting diodes for the corresponding display areas 706_1 and 706_2 is built into the display driving circuits 702_1 and 702_2.

[0070] In this case, each of the lamp boards LB7_1 and LB7_2 only includes one integrated circuit, that is, the display driving circuits 702_1 and 702_2. Therefore, the connection lines between the display driving circuit and the memory can be omitted. Correspondingly, the number of layers of the printed circuit board can also be saved, thereby simplifying the layout and achieving a lower cost.

[0071] In an embodiment of the present invention, the transmission channel (such as transmission channel CH1 or CH2 in display control systems 20 / 30, or transmission channel CH in display control systems 60 / 70) can be transmitted using a Point-to-Point High-Speed Interface (PHI). The point-to-point high-speed interface can achieve advantages such as high speed, low power consumption, and no clock / data skew. The Bidirectional CommandLink Clock (BCLC) and Bidirectional Command Link Data (BCLD) interfaces in the point-to-point high-speed interface can transmit compensation information C_INFO through Time-Division Multiplexing (TDM). In addition, the point-to-point high-speed interface uses Half Run Length Coding (HRLC) to transmit data with an embedded clock, thereby achieving the effect of low Electromagnetic Interference (EMI).

[0072] Figure 8 FIG. is a timing diagram of the point-to-point high-speed interface for transmission channel CH of display control system 60 or 70. Transmission channel CH can be used to transmit display data and compensation information, and thus requires a suitable timing arrangement. In this example, the main controller and the display driving circuit on the lamp board are connected in series. Among them, the main controller is connected to the first display driving circuit D_1 (i.e., the display driving circuit on the first lamp board), the first display driving circuit D_1 is also connected to the second display driving circuit D_2 (i.e., the display driving circuit on the second lamp board), the second display driving circuit D_2 is also connected to the third display driving circuit D_3 (i.e., the display driving circuit on the third lamp board), and so on.

[0073] Based on the point-to-point high-speed interface, each display driving circuit is required to perform Clock Training (CT) before receiving display data from the front-end device. Since the display data carried by the point-to-point high-speed interface has an embedded clock, the display driving circuit should perform clock training to find the clock frequency and thus identify the correct data.

[0074] In this example, the main controller may first output a first command CMD1 for the display driving circuit D_1. The display driving circuit D_1 then performs clock training according to the first command CMD1. After the clock training is completed, the display driving circuit D_1 may start data reception, and the main controller may transmit display data DAT1 to be received by the display driving circuit D_1.

[0075] Next, the main controller may output a second command CMD2 for the display driving circuit D_2 and transmit the second command CMD2 to the display driving circuit D_1. The display driving circuit D_1 then transmits the second command CMD2 to the display driving circuit D_2. According to the second command CMD2, the display driving circuit D_2 may perform clock training. After the clock training is completed, the display driving circuit D_2 may start data reception, and the main controller may transmit display data DAT2, which is relayed by the display driving circuit D_1 and received by the display driving circuit D_2.

[0076] In the same way, the main controller may sequentially output commands CMD3, CMD4... for subsequent display driving circuits D_3, D_4... and display data DAT3, DAT4..., and each display driving circuit may perform clock training and then data reception.

[0077] It should be noted that Figure 8 shows the operation of the transmission channel CH in the display control system 60 or 70, where the display data and the compensation information are transmitted through the same transmission channel CH. Therefore, after the display data is transmitted, the transmission channel CH can be used to transmit the compensation information C_INFO1 - C_INFO4, as Figure 8 shown.

[0078] The compensation information for different display driving circuits can also be transmitted time-divisionally. For example, the display driving circuit D_1 may first output the compensation information C_INFO1, which is transmitted to the main controller through the display driving circuits D_2, D_3... etc. Then the display driving circuit D_2 outputs the compensation information C_INFO2, which is transmitted to the main controller through the display driving circuits D_3, D_4... etc. And so on, and the compensation information C_INFO1 - C_INFO4 of all display driving circuits can be transmitted through the transmission channel CH.

[0079] It should be noted that the object of the present invention is to propose a new display control system applicable to a splicing screen. Those skilled in the art can make modifications or variations accordingly, and are not limited thereto. For example, in the above embodiment, the compensation information transmitted from the display driving circuit to the main controller includes moiré compensation information and / or abnormal information, but the present invention is not limited thereto. In another embodiment, the compensation information may also include any other information required by the main controller. In addition, the display control system of the present invention can be applied to a splicing screen or any other screen, which can be any type of display screen, such as a light-emitting diode panel, a mini light-emitting diode panel, a micro light-emitting diode panel, an extreme light-emitting diode panel, or an organic light-emitting diode panel, but is not limited thereto.

[0080] In addition, the lamp boards used to form the splicing screen can be connected in series in any suitable manner. For example, as Figure 9 shown, a splicing screen 90 can be divided into 9 display areas Z_0 to Z_8, which are respectively included on 9 lamp boards. Among them, each lamp board can include a display driving circuit, namely D_0 to D_8, and the display driving circuits D_0 to D_8 are connected in series. The first display driving circuit D_0 and the last display driving circuit D_8 are also coupled to the main controller.

[0081] It should be noted that Figure 9 the structure is only one of the numerous embodiments of the present invention. In another embodiment, the display driving circuits can be connected in series in other ways, and the related connection methods should not be used to limit the scope of the present invention.

[0082] In addition, in the above embodiment, the point-to-point high-speed interface is applied to the serial transmission channel, such as the display control system 60 or 70. In another embodiment, the point-to-point high-speed interface can also be applied to a multi-branch interface. For example, the transmission channel for transmitting the compensation information can be implemented as a multi-branch interface. Figure 10 is a schematic diagram of a display control system 1000 according to Embodiment 1 of the present invention. The display control system 1000 includes a main controller 1002 and a plurality of lamp boards LB10_1, LB10_2. Among them, each lamp board LB10_1, LB10_2 is used to form a display area 1006_1, 1006_2, and includes a display driving circuit 1004_1, 1004_2, which are respectively arranged as control circuits 1008_1, 1008_2 on a circuit board (such as a printed circuit board).

[0083] The display driving circuits 1004_1 and 1004_2 on different lamp boards LB10_1 and LB10_2 are connected through transmission channels CH1 and CH2. The transmission channel CH1 is used to serially connect the display driving circuits, and each transmission channel CH1 can be coupled between two display driving circuits (such as 1004_1 and 1004_2), or coupled between the display driving circuit 1004_1 and the main controller 1002. The transmission channel CH1 can transmit the display data DAT from the main controller 1002 to the display driving circuits 1004_1 and 1004_2. In this example, the transmission channel CH1 can serve as the main channel of the point-to-point high-speed interface.

[0084] In addition, the transmission channel CH2 can transmit the compensation information C_INFO from the display driving circuits 1004_1 and 1004_2 to the main controller 1002, which can be achieved through the bidirectional command link clock / bidirectional command link data interface in the point-to-point high-speed interface. In this example, the transmission channel CH2 adopts a multi-branch interface, which is connected to the main controller 1002 and the display driving circuits 1004_1 and 1004_2 on all lamp boards through a transmission bus.

[0085] In summary, the present invention proposes a new display control system that can be used for a tiled screen. The display control system can include a main controller and multiple lamp boards, and each lamp board has a display area for constructing the tiled screen. In one embodiment, a lamp board can include a sub-controller, a memory, and multiple display driving circuits, and the sub-controllers on different lamp boards can be connected in series. Each sub-controller can output display data to the display driving circuit, and the display driving circuit returns the compensation information to the sub-controller, and the sub-controller then transmits the compensation information to the main controller.

[0086] In another embodiment, a lamp board can include a memory and a single display driving circuit, where the sub-controller is omitted. The display driving circuit can implement the functions of the sub-controller and multiple display driving circuits in the previous embodiment to achieve a lower cost with a simplified circuit structure. The display driving circuits on different lamp boards can be connected in series. The display driving circuit can be serially connected through two channels, where one channel is used to transmit display data and the other channel is used to transmit compensation information. To further simplify the circuit connection, the display driving circuit can be serially connected through a single channel, and this channel can be used to transmit both display data and compensation information.

[0087] In yet another embodiment, the memory can be integrated with the display driving circuit to further reduce the number of integrated circuits in the display control system and simplify the circuit connection at the same time. Since a tiled screen includes a large number of lamp boards, the simplification of the lamp board structure will significantly reduce the overall cost of the tiled screen.

[0088] Embodiments of the present invention can use a point-to-point high-speed interface for transmission to achieve advantages such as high speed, low power consumption, no clock / data offset, and low electromagnetic interference.

[0089] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A display control system for controlling a display screen having a plurality of display areas, characterized in that, the display control system comprises: a main controller; a plurality of display driving circuits, each of the display driving circuits being coupled to a corresponding one of the plurality of display areas to control the corresponding display area; and a plurality of memories, each of the memories being coupled to a corresponding one of the plurality of display driving circuits to store a compensation data for a corresponding one of the display areas, the display area being controlled by the corresponding display driving circuit; wherein the plurality of display driving circuits are connected in series through a plurality of first transmission channels and are connected through at least one second transmission channel, and each of the plurality of first transmission channels is coupled between two of the plurality of display driving circuits or between one of the plurality of display driving circuits and the main controller.

2. The display control system according to claim 1, characterized in that, the main controller transmits a display data to a first display driving circuit among the plurality of display driving circuits without passing through a sub-controller.

3. The display control system according to claim 1, characterized in that, the plurality of first transmission channels transmit a display data from the main controller to a first display driving circuit among the plurality of display driving circuits, and the at least one second transmission channel transmits a compensation information from a second display driving circuit among the plurality of display driving circuits to the main controller.

4. The display control system according to claim 3, characterized in that, the compensation information includes at least one of a moire compensation information and an abnormal information of a display area corresponding to the second display driving circuit among the plurality of display areas.

5. The display control system according to claim 1, characterized in that, at least one of the plurality of first transmission channels and the at least one second transmission channel includes a point-to-point high-speed interface.

6. The display control system according to claim 1, characterized in that, the compensation data stored in a first memory among the plurality of memories includes a moire compensation data for a display area corresponding to the first memory among the plurality of display areas.

7. The display control system according to claim 1, characterized in that, a first memory among the plurality of memories is built in the corresponding display driving circuit.

8. The display control system according to claim 1, characterized in that, each of the at least one second transmission channels is coupled between two of the plurality of display driving circuits to connect the plurality of display driving circuits in series.

9. The display control system according to claim 1, characterized in that, the at least one second transmission channel includes a multi-branch interface.

10. A display control system for controlling a display screen having a plurality of display areas, characterized in that, the display control system comprises: a main controller; a plurality of sub-controllers, coupled to the main controller, each of the sub-controllers being used to control a corresponding one of the plurality of display areas; A plurality of display driving circuits, each of the display driving circuits being coupled to one of the plurality of sub - controllers and a display area controlled by the corresponding sub - controller among the plurality of display areas; and A plurality of memories, each of the memories being coupled to a corresponding one of the plurality of sub - controllers to store a compensation data for a corresponding one of the plurality of display areas, The display area being controlled by the corresponding sub - controller; Wherein, the plurality of sub - controllers are cascaded through a plurality of first transmission channels; Wherein, a first sub - controller among the plurality of sub - controllers is coupled to a plurality of first display driving circuits among the plurality of display driving circuits through a second transmission channel and a third transmission channel.

11. The display control system according to claim 10, Characterized in that, The second transmission channel transmits a display data from the first sub - controller to one of the plurality of first display driving circuits, and the third transmission channel transmits a compensation information from one of the plurality of first display driving circuits to the first sub - controller.

12. The display control system according to claim 11, Characterized in that, The compensation information includes at least one of a moiré compensation information and an abnormal information of the display area corresponding to the first sub - controller among the plurality of display areas.

13. The display control system according to claim 11, Characterized in that, The third transmission channel for transmitting the compensation information includes a multi - branch interface.

14. The display control system according to claim 10, Characterized in that, Each of the second transmission channel and the third transmission channel includes a point - to - point high - speed interface.

15. The display control system according to claim 10, Characterized in that, The compensation data stored in a first memory among the plurality of memories includes a moiré compensation data for a display area corresponding to the first memory among the plurality of display areas.

16. A display control system for controlling a display screen having a plurality of display areas, Characterized in that, The display control system includes: A main controller; A plurality of display driving circuits, each of the display driving circuits being coupled to a corresponding one of the plurality of display areas to control the corresponding display area; and A plurality of memories, each of the memories being coupled to a corresponding one of the plurality of display driving circuits to store a compensation data for the corresponding display area, the display area being controlled by the corresponding display driving circuit; Wherein, the plurality of display driving circuits are cascaded through a plurality of transmission channels, and each of the plurality of transmission channels is coupled between two of the plurality of display driving circuits or between one of the plurality of display driving circuits and the main controller.

17. The display control system according to claim 16, Characterized in that, The main controller transmits a display data to a first display driving circuit among the plurality of display driving circuits without passing through a sub - controller.

18. The display control system according to claim 16, Characterized in that, The plurality of transmission channels transmit a display data from the main controller to a first display driving circuit among the plurality of display driving circuits, and transmit a compensation information from a second display driving circuit among the plurality of display driving circuits to the main controller.

19. The display control system according to claim 18, wherein, the compensation information includes at least one of a moire compensation information and an abnormal information of a display area corresponding to the second display driving circuit among the plurality of display areas.

20. The display control system according to claim 16, wherein, each of the plurality of transmission channels includes a point-to-point high-speed interface.

21. The display control system according to claim 16, wherein, the compensation data stored in a first memory among the plurality of memories includes a moire compensation data for a display area corresponding to the first memory among the plurality of display areas.

22. The display control system according to claim 16, wherein, a first memory among the plurality of memories is built in the corresponding display driving circuit.

Images