CN118276358B - Backlight driving device, method, backlight panel and liquid crystal display - Google Patents
Backlight driving device, method, backlight panel and liquid crystal display Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133612—Electrical details
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
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Abstract
本发明公开了一种背光驱动装置、方法及背光板和液晶显示器，包括驱动器和至少一个通道切换模块，每个通道切换模块分别与驱动器和N种颜色的LED连接；驱动器用于：首先从获取到的数据信号中提取出对应的第一数据，且第一数据至少包括：每个通道切换模块连接的LED的亮度数据；然后从第一数据中提取出任一种颜色的LED对应的亮度数据，并将该种颜色的LED对应的第二数据发送至每个通道切换模块；通道切换模块在接收到任一种颜色的LED对应的地址数据后，控制接收到的该种颜色的LED的亮度数据传输至该种颜色的LED中。如此，通过设置通道切换模块，可以在不增加驱动器端口的情况下驱动更多的LED，从而减少了驱动器的端口数量。
The present invention discloses a backlight driving device, method, backlight panel and liquid crystal display, including a driver and at least one channel switching module, each channel switching module is respectively connected to the driver and LEDs of N colors; the driver is used to: first extract the corresponding first data from the acquired data signal, and the first data at least includes: the brightness data of the LED connected to each channel switching module; then extract the brightness data corresponding to any color of LED from the first data, and send the second data corresponding to the LED of this color to each channel switching module; after receiving the address data corresponding to any color of LED, the channel switching module controls the received brightness data of the LED of this color to be transmitted to the LED of this color. In this way, by setting the channel switching module, more LEDs can be driven without increasing the driver ports, thereby reducing the number of driver ports.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight driving device and method, a backlight plate and a liquid crystal display.
Background
At present, the backlight source directly drives the LEDs through the driver, and each port of the driver is connected to and drives one LED, so when the number of LEDs in the backlight source increases, the number of ports of the driver also increases correspondingly, which causes the driver to consume increased power, generate serious heat, and limit the size of the driver. How to reduce the number of ports of the driver when the number of LEDs in the backlight source is large is a technical problem to be solved in the art.
Disclosure of Invention
The embodiment of the invention provides a backlight driving device and method, a backlight plate and a liquid crystal display, which are used for reducing the number of ports of a driver when the number of LEDs in a backlight light source is large.
In a first aspect, an embodiment of the present invention provides a backlight driving apparatus, including: the LED display device comprises a driver and at least one channel switching module, wherein each channel switching module is respectively connected with the driver and N colors of LEDs, and N is a positive integer greater than 1;
The driver is used for: extracting corresponding first data from the acquired data signal, wherein the first data at least comprises: brightness data of the LEDs connected with each channel switching module; extracting brightness data corresponding to any color of LEDs from the first data, and sending second data corresponding to the color of LEDs to each channel switching module, wherein the second data corresponding to the color of LEDs are sequentially sent, and the second data comprise: brightness data and address data, wherein the brightness data received by the channel switching module is used for lighting the LED connected with the channel switching module;
The channel switching module is used for: and in response to receiving address data corresponding to the LEDs of any color, controlling the received brightness data of the LEDs of the color to be transmitted to the LEDs of the color.
In a second aspect, an embodiment of the present invention provides a backlight driving method using the backlight driving device described in the first aspect, including:
the driver extracts corresponding first data from the acquired data signals; wherein the first data includes at least: brightness data of LEDs of various colors connected with each channel switching module;
For any color of LED, the driver performs the following process until all N colors of LEDs are lit:
The driver extracts brightness data corresponding to any color LED from the first data; the driver sends second data corresponding to the LEDs with the colors to each channel switching module; wherein the second data includes: luminance data and address data, and the second data corresponding to the LEDs of various colors are sequentially sent, and the luminance data received by the channel switching module is: luminance data for lighting the connected LEDs; and the channel switching module controls the received brightness data of the LEDs with the colors to be transmitted to the LEDs with the colors according to the address data corresponding to the LEDs with the colors.
In a third aspect, an embodiment of the present invention provides a backlight panel, including: n colors of LEDs, and a backlight driving device as described in the first aspect above.
In a fourth aspect, an embodiment of the present invention provides a liquid crystal display, including: a display panel, and a backlight as described in the third aspect;
The backlight plate is used for: and providing backlight to the backlight surface of the display panel so that the display panel displays based on the backlight.
The invention has the following beneficial effects:
The embodiment of the invention provides a backlight driving device and method, a backlight plate and a liquid crystal display, wherein the backlight driving device comprises a driver and at least one channel switching module, each channel switching module is respectively connected with the driver and N colors of LEDs, and N is a positive integer larger than 1; the driver is used for: firstly, extracting corresponding first data from the acquired data signals, wherein the first data at least comprises: brightness data of the LEDs connected with each channel switching module; and then extracting brightness data corresponding to the LEDs with any color from the first data, and sending second data corresponding to the LEDs with the color to each channel switching module, wherein the second data corresponding to the LEDs with various colors are sequentially sent, and the second data comprises: the brightness data received by the channel switching module are used for lighting the LEDs connected with the channel switching module; the channel switching module is used for: and after receiving address data corresponding to the LEDs with any color, controlling the received brightness data of the LEDs with the color to be transmitted to the LEDs with the color. So, through setting up the passageway switching module, can drive more LEDs under the condition of not increasing the driver port to reduce the port quantity of driver, and then reduced the size of driver, and when backlight drive arrangement is applied to the board in a poor light, can reduce the setting quantity of driver on the board in a poor light, make the structure of board in a poor light simpler, reduced the complexity and the area occupied of board in a poor light, reduced the cost of board in a poor light.
Drawings
Fig. 1 is a schematic structural diagram of a backlight driving device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a data signal according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another backlight driving device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a driver sending second data according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of address data locations in first data according to an embodiment of the present invention;
FIG. 6 is a flowchart of a method for driving a backlight according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a backlight unit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a liquid crystal display according to an embodiment of the invention.
Detailed Description
The following describes in detail a backlight driving device, a backlight driving method, a backlight plate and a liquid crystal display according to embodiments of the present invention with reference to the accompanying drawings. It should be noted that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a backlight driving device, as shown in fig. 1, the structure shown by a dashed box a is the backlight driving device, which comprises: the LED display device comprises a driver 100 and at least one channel switching module 200, wherein each channel switching module 200 is respectively connected with the driver 100 and N colors of LEDs, and N is a positive integer greater than 1; the channel switching module 200 may be provided with one, two, three or more, and may be specifically provided according to actual needs, which is not limited herein, and only the two channel switching modules 200 shown in fig. 1 are taken as an example for illustration.
The driver 100 is configured to: corresponding first data are extracted from the acquired data signal DI, and the first data at least comprise: brightness data of the LEDs connected to each channel switching module 200; luminance data corresponding to any color of LEDs is extracted from the first data, second data D2 corresponding to the color of LEDs is sent to each channel switching module 200, and second data D2 corresponding to the color of LEDs is sequentially sent, where the second data D2 includes: luminance data and address data, the luminance data received by the channel switching module 200 is used to light the LED connected to the channel switching module 200. Wherein, any color LED can be understood as: one of the N color LEDs, for example, when three colors of red, green, and blue are included, may be a red LED, a green LED, or a blue LED.
Taking the configuration shown in fig. 1 as an example, when N is 3, the multicolor light source may be, but not limited to, an RGB light source, the LEDs 11 and 12 may be red LEDs, the LEDs 21 and 22 may be green LEDs, the LEDs 31 and 32 may be blue LEDs, and the second data D2 of the red LEDs, green LEDs, and blue LEDs are sequentially transmitted, and the luminance data received by the upper channel switching module 200 in fig. 1 is the luminance data of the LEDs 11, 21, and 31 connected thereto, and the luminance data received by the lower channel switching module 200 in fig. 1 is the luminance data of the LEDs 12, 22, and 32 connected thereto. Of course, the value of N and the color of the multicolor light source may be selected according to actual needs, which is not limited herein.
The channel switching module 200 is configured to: and in response to receiving address data corresponding to the LEDs of any color, controlling the received brightness data of the LEDs of the color to be transmitted to the LEDs of the color.
Therefore, by arranging the channel switching module, more LEDs can be driven when the number of ports of the driver is not changed, and further when the number of LEDs is larger due to the fact that the backlight light source comprises N colors of LEDs, the driver can drive the N colors of LEDs by arranging fewer ports, so that the number of ports of the driver is reduced, the size of the driver is further reduced, and the cost of the driver is reduced; when the backlight driving device is applied to the backlight plate, the number of the drivers on the backlight plate can be reduced, so that the structure of the backlight plate is simpler, the complexity and the occupied area of the backlight plate are reduced, and the cost of the backlight plate is reduced; further, the driver is provided with fewer ports, so that the power consumption of the driver can be reduced, the heat generation of the driver is reduced, the driver does not need a larger area for heat dissipation, the size of the driver is reduced, and the size of the liquid crystal display device is reduced.
In addition, as shown in fig. 1, the driver is further connected to a ground terminal GND, VDD is a supply voltage of the driver, and VLED is a supply voltage of each LED, so that the driver and each LED normally operate under the driving of the respective supply voltages.
Alternatively, the N colors of LEDs may include: red LEDs, green LEDs, and blue LEDs, thereby forming an RGB backlight. RGB backlights are backlights that mix different colors by using LEDs of three colors of R (red), G (green), and B (blue), thereby achieving better color expression and wider color gamut coverage. RGB backlights are commonly used in high-end displays and televisions, etc. to improve graphics quality and visual effect. The working principle of the RGB backlight is that different colors of light rays are emitted behind a display by using LEDs with different colors, and then the backlight effect of various colors is realized by mixing the light rays. Since the brightness and color of each LED can be independently controlled in the RGB backlight, higher contrast and more accurate color reproduction can be achieved. In addition, the RGB backlight can realize better dynamic range and high dynamic range imaging (HIGH DYNAMIC RANGE IMAGING, HDR) effect by dynamically adjusting the brightness and color of each LED.
Of course, the N colors of LEDs may include, in addition to: the red LED, the green LED and the blue LED may be used to form an RGB backlight, and other backlight manners well known to those skilled in the art may be used, for example, but not limited to, RGBW backlight, that is, a backlight in which four colors of R (red), G (green), B (blue) and W (white) are mixed to form different colors, and the backlight may be specifically set according to practical needs, which is not limited herein.
Alternatively, a frame of data signal acquired by the driver may include, but is not limited to: communication identification code, backlight driving function instruction, driver address, brightness data and readback data. The format of the data signal may be specifically shown in fig. 2, where the communication identification code includes, but is not limited to, an error protection code; the functions corresponding to the backlight driving function instruction include, but are not limited to: a delay function, a voltage quick feedback function, a black insertion function, an open function, a short function and the like; the drive address is used to: when the driver recognizes the corresponding driver address, extracting the first data corresponding to the driver address, for example, as shown in fig. 2, the driver address includes a driver address 1, a driver address 2, and the like, the first data includes a luminance data 1, a luminance data 2, and the like, when the driver address corresponding to the driver is the driver address 1, the driver extracts the luminance data 1, and when the driver address corresponding to the driver is the driver address 2, the driver extracts the luminance data 2; the readback data is used to: when the driver reads the read-back data, the state data of the driver is returned to the time sequence driver so as to verify the accuracy and the integrity of the received data of the driver.
Optionally, as shown in fig. 3, the channel switching module 200 includes: a luminance input port (e.g., R1 or R2) and N luminance output ports (e.g., Q11, Q21 and Q31, or Q12, Q22 and Q32), the N luminance output ports being correspondingly connected to the N color LEDs, such as in fig. 3, luminance output port Q11 being connected to LED11, luminance output port Q21 being connected to LED21, and luminance output port Q31 being connected to LED 31;
The channel switching module 200 is specifically configured to: in response to receiving address data DD corresponding to an LED of any one color, the brightness input port is controlled to be connected with a brightness output port connected with the LED of the color and form a transmission channel, and when brightness data (such as DL1 and DL 2) corresponding to the LED of the color is input to the brightness input port, the brightness data is transmitted to the LED of the color through the transmission channel. The channel switching module 200 includes, but is not limited to, a multiplexer, a demultiplexer, and the like.
For example, as shown in fig. 3, the LED11 and the LED12 are each represented as a red LED, and the channel switching module 200 located at the uppermost in fig. 3 is exemplified by controlling the luminance input port R1 to be connected to the luminance output port Q11 upon receiving address data of the red LED, so that a transmission path is formed from the luminance input port R1 to the LED11, so that when the channel switching module 200 receives luminance data corresponding to the red LED, the luminance data is input from the luminance input port R1 and transmitted to the red LED (i.e., the LED 11) through the transmission path, thereby lighting the red LED.
Therefore, the channel switching module can send the brightness data to the corresponding LEDs according to the address data, the LEDs receive the brightness data and send out the corresponding brightness, and then the channel switching module can be used for lighting a plurality of LEDs.
Optionally, when the driver sends the second data corresponding to the LEDs of any color to each channel switching module, specific implementations include the following:
implementation 1:
As shown in fig. 3, a first path and a second path are provided between the driver 100 and each channel switching module 200, and the second paths corresponding to different channel switching modules 200 are connected to different ports of the driver 100; the driver 100 is specifically configured to: firstly, address data DD corresponding to LEDs of any color are sent to each connected channel switching module 200 through a first channel; and then sends the brightness data corresponding to the LED with the color to each connected channel switching module 200 through the second channel.
For example, as shown in fig. 3, LED11 and LED12 are both of a first color, LED21 and LED22 are both of a second color, and LED31 and LED32 are both of a third color, for LED11 and LED12: the driver 100 transmits address data corresponding to the LEDs 11 and 12 to the two channel switching modules 200 through a first path (i.e., a path transmitting DD in fig. 3), and then the driver 100 transmits luminance data of the LEDs 11 to the channel switching module 200 connected to the uppermost side through the one uppermost path (i.e., a path transmitting DL1 in fig. 3), and transmits luminance data of the LEDs 12 to the channel switching module 200 connected to the lowermost side through the one lowermost path (i.e., a path transmitting DL2 in fig. 3). The address data and luminance data transmission for the LEDs 21 and 22, and the address data and luminance data transmission for the LEDs 31 and 32 are similar to the above-described process, and will not be described in detail here.
Therefore, the address data and the brightness data are transmitted respectively through the first passage and the second passage, so that the channel switching module does not need to distinguish the address data and the brightness data, and the requirement on the channel switching module is reduced.
In addition, when the first path and the second path are provided between the driver and each channel switching module, the data format of the second data may be as shown in fig. 4, and the address data and the corresponding brightness data may be sequentially sent to the channel switching modules, so that the brightness data may be transmitted to the corresponding LEDs after being sent to the channel switching modules.
Alternatively, as shown in fig. 3, when the driver 100 sends address data DD corresponding to any color LED to the connected channel switching module 200, for example, as shown in fig. 3, if the LED11 and the LED12 are both red LEDs, the address data DD corresponding to the red LEDs may be sent simultaneously, or may be sequentially sent, where the driver 100 needs to send the address data DD through different ports (not shown in fig. 3) when sending the address data DD sequentially, and may also send the address data DD through different ports when sending the address data DD through different ports, which may specifically be set according to actual requirements, and is not limited herein.
Alternatively, as shown in fig. 3, when the driver 100 sends the luminance data DATAL corresponding to the LEDs of the corresponding colors to the connected channel switching modules 200 through the second path, the luminance data may be sent simultaneously, for example, as shown in fig. 3, if the LEDs 11 and 12 are both red LEDs, the driver 100 may send the luminance data DL1 and DL2 corresponding to the red LEDs to the connected channel switching modules 200 simultaneously, or may send the luminance data sequentially, which may be specifically set according to actual requirements, and is not limited herein.
Alternatively, as shown in fig. 3, the first paths corresponding to the different channel switching modules 200 are connected to the same port of the driver 100. In this way, the driver 100 can send the address data DD to each channel switching module 200 through the same port at the same time, so that the number of ports of the driver 100 is reduced, and the complexity of the connection between the driver 100 and the channel switching module 200 is reduced.
Implementation 2:
Specifically, a first passage is arranged between the driver and each channel switching module, and the first passages corresponding to different channel switching modules are connected with different ports of the driver; the driver is particularly for: and sending second data corresponding to the LEDs with any color to each connected channel switching module through the first channel. In this way, the driver sends the second data including address data and brightness data to the channel switching module through the first path, further reducing the number of driver ports to be set, and further reducing the complexity of the connection between the driver and the channel switching module.
It should be understood that when the driver sends the second data to the connected channel switching module through the first channel, the order of the address data and the brightness data in the second data may be set according to the actual needs, which is not limited herein, and the channel switching module needs to extract the address data and the brightness data from the second data after receiving the second data, and control the brightness input port to connect with the corresponding brightness output port according to the address data and form a transmission channel, so that the brightness data is transmitted to the corresponding LED through the transmission channel.
In short, in a specific implementation, implementation 1 or implementation 2 may be adopted according to actual needs, so as to meet the needs of different application scenarios.
Of course, the channel switching module may use other ways known to those skilled in the art, such as but not limited to: the channel switching module comprises an input port, a processor and a plurality of output ports, the input port and the plurality of output ports are respectively connected with the processor, when the channel switching module receives address data and corresponding brightness data from the input port, the processor judges which output port the LED corresponding to the address data is connected with and outputs the brightness data from the output port, and the channel switching module can be specifically set according to actual needs and is not limited in the specification.
Optionally, address data corresponding to each color of LED is preconfigured in the driver; or the first data further comprises: address data corresponding to each color LED.
When the first data includes address data corresponding to each color LED, as shown in fig. 5, the arrangement order of brightness data and address data corresponding to each color LED may be: as shown in (a) of fig. 5, the brightness data precedes the address data; or as shown in fig. 5 (b), the brightness data follows the address data; as shown in fig. 5 (c), the luminance data may include a first portion of luminance data before the address data and a second portion of luminance data after the address data, the address data being between the first portion of luminance data and the second portion of luminance data. Therefore, the address data may be set in the drive or the first data according to actual needs, and the specific setting manner is not limited herein.
Therefore, when the address data is pre-configured in the driver, the bandwidth occupied by the data signals can be reduced; when the address data is located in the second data, the address data does not need to be additionally configured in the driver, and the flexibility of address data setting is higher.
Optionally, as shown in fig. 3, the structure shown by a dashed box a is a backlight driving device, and the backlight driving device further includes: a current holding module 300 connected to each LED, the current holding module 300 being further connected to a channel switching module 200 corresponding to the connected LED; the channel switching module 200 is further configured to: for any color LED: in response to receiving address data DD corresponding to the LEDs of the color, transmitting brightness data DATAL of the LEDs of the color to the LEDs of the color and a current holding module 300 connected to the LEDs of the color, respectively; the current holding module 300 is for: the received luminance data DATAL is transmitted to the connected LEDs.
After the current holding module transmits the brightness data to the connected LEDs, the corresponding LEDs can be maintained to be lightened for a period of time so as to achieve the required backlight effect, and the specific lightening time can be set according to actual needs and is not limited in the specification; the current holding module may be, but is not limited to: and when the current holding module is an inductor, the inductor is connected in series with the corresponding LED.
Therefore, when the channel switching module does not provide brightness data for the LEDs, the current holding module can continue to provide the brightness data for the LEDs, so that the LEDs can maintain a long-time lighting state, and the display effect of the liquid crystal display can be improved when the backlight driving device is applied to the liquid crystal display. Of course, the backlight driving device may not be provided with the current holding module, and the brightness of the LED may be set higher, so that the liquid crystal display may have a better display effect.
As shown in fig. 3, taking the uppermost channel switching module 200 shown in the drawing as an example, when the current holding module is a capacitor, the working principles of the capacitors C11, C21, and C31 are as follows:
When the luminance input port R1 and the luminance output port Q11 of the channel switching module 200 form a transmission path, luminance data of the LED11 is output from the luminance output port Q11, the LED11 is turned on, and the capacitor C11 is charged;
When the transmission path formed by the luminance input port R1 and the luminance output port Q11 of the channel switching module 200 is disconnected and the transmission path formed by the luminance input port R1 and the luminance output port Q21 of the channel switching module 200 is formed, the luminance data of the LED21 is output from the luminance output port Q21, the LED21 is turned on, the capacitor C21 is charged, and at this time, the capacitor C11 is in a discharge state and provides the luminance data for the LED11, so that the LED11 can be continuously turned on;
When the transmission path formed by the luminance input port R1 and the luminance output port Q21 of the channel switching module 200 is disconnected and the transmission path formed by the luminance input port R1 and the luminance output port Q31 of the channel switching module 200 is formed, the luminance data of the LED31 is output from the luminance output port Q31, the LED31 is turned on, the capacitor C31 is charged, and at this time, the capacitor C21 is in a discharge state and provides the luminance data for the LED21, so that the LED21 can be continuously turned on;
Similarly, the transmission path formed by the luminance input port R1 and the luminance output port Q31 of the channel switching module 200 is disconnected, and at this time, the capacitor C31 is in a discharge state and provides luminance data to the LED31, so that the LED31 can be continuously lighted.
In addition, as shown in fig. 3, when a plurality of serial backlight driving apparatuses a are provided, the uppermost driver 100 extracts its own first data from the data signal DI and transmits the data signal DI to the lowermost driver 100, and the lowermost driver 100 receives the data signal DI and extracts its own first data from the data signal DI. Thus, a plurality of drivers can extract the first data of the drivers, and further more LEDs can be driven. In addition, after the uppermost driver 100 extracts the first data of itself, the data signal DI may be directly sent to the lowermost driver 100 to reduce the processing complexity, or, of course, after the uppermost driver 100 extracts the first data of itself, the first data corresponding to the uppermost driver 100 may be deleted from the data signal DI to form a sub-data signal, and the sub-data signal may be sent to the lowermost driver 100 to improve the transmission efficiency of the data signal.
Of course, instead of the serial connection, other connection manners known to those skilled in the art may be used for each backlight driving device, such as but not limited to: the parallel connection may be specifically set according to actual needs, and is not limited herein.
Based on the same inventive concept, the embodiment of the present invention further provides a backlight driving method, the implementation principle of the backlight driving method is similar to that of the foregoing backlight driving device, and the specific implementation manner of the backlight driving method may refer to the foregoing embodiment of the backlight driving device, and the repetition is omitted.
Specifically, as shown in fig. 6, N is 3, which is taken as an example, and of course N may be other values such as 2,4, 5, 6, etc., which is not limited herein. The backlight driving method comprises the following steps:
s601, a driver extracts corresponding first data from the acquired data signals; wherein the first data comprises at least: brightness data of LEDs of various colors connected with each channel switching module;
S602, the driver extracts brightness data corresponding to the LEDs with the first color from the first data; the driver sends second data corresponding to the LEDs with the colors to each channel switching module; wherein the second data includes: luminance data and address data, and the second data that each color LED corresponds to is sent in proper order, and the luminance data that the passageway switching module received is: luminance data for lighting the connected LEDs; the channel switching module controls the received brightness data of the LEDs with the colors to be transmitted to the LEDs with the colors according to the address data corresponding to the LEDs with the colors;
S603, the driver extracts brightness data corresponding to the LEDs with the second color from the first data; the driver sends second data corresponding to the LEDs with the colors to each channel switching module; wherein the second data includes: luminance data and address data, and the second data that each color LED corresponds to is sent in proper order, and the luminance data that the passageway switching module received is: luminance data for lighting the connected LEDs; the channel switching module controls the received brightness data of the LEDs with the colors to be transmitted to the LEDs with the colors according to the address data corresponding to the LEDs with the colors;
S604, the driver extracts brightness data corresponding to the LED with the third color from the first data; the driver sends second data corresponding to the LEDs with the colors to each channel switching module; wherein the second data includes: luminance data and address data, and the second data that each color LED corresponds to is sent in proper order, and the luminance data that the passageway switching module received is: luminance data for lighting the connected LEDs; and the channel switching module controls the received brightness data of the LEDs with the colors to be transmitted to the LEDs with the colors according to the address data corresponding to the LEDs with the colors.
Of course, when the value of N is 2,4, 5, 6, etc., other larger values, the specific backlight driving method is similar to the processes described in S601 to S604, but the processes described in S601 to S604 need to be correspondingly deleted or added according to the value of N, which is not described herein.
In this way, the channel switching module transmits the brightness data to the corresponding LEDs according to the address data, more LEDs can be driven when the number of ports of the driver is not changed, and further when the number of LEDs is more due to the fact that the backlight light source comprises N colors of LEDs, the driver can drive the N colors of LEDs by setting fewer ports, so that the number of ports of the driver is reduced, and the cost of the driver is reduced; further, the driver is provided with fewer ports, so that the power consumption of the driver can be reduced, the heat generation of the driver is reduced, the driver does not need a larger area for heat dissipation, the size of the driver is reduced, and the size of the liquid crystal display device is reduced.
Optionally, the channel switching module includes: a luminance input port and N luminance output ports, when the N luminance output ports are correspondingly connected to the N color LEDs, step S604 specifically includes: after the channel switching module receives address data corresponding to the LEDs of any color, the brightness input port is controlled to be connected with the brightness output port connected with the LEDs of the color to form a transmission channel, so that when the brightness data corresponding to the LEDs of the color is input to the brightness input port, the brightness data is transmitted to the LEDs of the color through the transmission channel. Therefore, the channel switching module can send the brightness data to the corresponding LEDs according to the address data, the LEDs receive the brightness data to excite the corresponding brightness according to the brightness data, and then the channel switching module can be used for lighting a plurality of LEDs.
Optionally, a first path and a second path are provided between the driver and each channel switching module, and when the second paths corresponding to different channel switching modules are connected to different ports of the driver, step S603 specifically includes: the driver firstly sends address data corresponding to LEDs of any color to the connected channel switching module through a first channel; and sending the brightness data corresponding to the LEDs with the colors to the connected channel switching module through the second channel. Therefore, the first passage and the second passage are adopted to respectively transmit the address data and the brightness data, so that the channel switching module does not need to distinguish the address data and the brightness data, and the requirement on the channel switching module is reduced.
Optionally, a first path is provided between the driver and each channel switching module, and when the first paths corresponding to different channel switching modules are connected to different ports of the driver, step S603 specifically includes: the driver sends second data corresponding to the LEDs with any color to the connected channel switching module through the first channel. In this way, the driver sends the second data including address data and brightness data to the channel switching module through the first path, reducing the number of driver ports to be set, and reducing the complexity of the connection between the driver and the channel switching module.
Optionally, the backlight driving device further includes: a current holding module connected to each LED, when the current holding module is further connected to the channel switching module corresponding to the connected LED, step S604 specifically includes: the channel switching module controls the received brightness data of the LEDs with the colors according to the address data corresponding to the LEDs with any color, and respectively transmits the brightness data to the LEDs with the colors and the current holding modules connected with the LEDs with the colors; the current holding module transmits the received luminance data to the connected LEDs. Therefore, when the channel switching module does not provide brightness data for the LEDs, the current holding module continues to provide the brightness data for the LEDs, so that the LEDs can maintain a long-time lighting state, and the display effect of the liquid crystal display can be improved when the backlight driving device is applied to the liquid crystal display.
The backlight driving method provided by the embodiment of the invention is explained below with reference to specific embodiments. The backlight driving device shown in fig. 3 is exemplified, and the LEDs 11 and 12 are of a first color, the LEDs 21 and 22 are of a second color, and the LEDs 31 and 32 are of a third color.
S1, the driver 100 acquires a frame data signal DI and extracts first data corresponding to the driver 100 from the frame data signal DI;
S2, the driver 100 sends address data corresponding to the LEDs (namely the LEDs 11 and the LEDs 12) with the first color to the two channel switching modules 200 through a first channel (such as a channel for transmitting the address data DD in FIG. 3), so that a brightness input port R1 and a brightness output port Q11 form transmission channels R1-Q11, and a brightness input port R2 and a brightness output port Q12 form transmission channels R2-Q12;
S3, the driver 100 extracts the brightness data corresponding to the LED11 from the first data, sends the brightness data to the brightness input port R1 through a second path (such as a path for transmitting the brightness data DL1 in FIG. 3), extracts the brightness data corresponding to the LED12 from the first data, sends the brightness data to the brightness input port R2 through the second path (such as a path for transmitting the brightness data DL2 in FIG. 3), outputs the brightness data corresponding to the LED11 and the capacitor C11 through the transmission paths R1-Q11, lights the LED11 and charges the capacitor C11, outputs the brightness data corresponding to the LED12 and the capacitor C12 through the transmission paths R2-Q12, lights the LED12 and charges the capacitor C12;
s4, the driver 100 sends address data corresponding to the second color LEDs (namely LEDs 21 and LEDs 22) to the two channel switching modules 200 through a first channel (such as a channel for transmitting the address data DD in FIG. 3), so that the transmission channels R1-Q11 formed by the brightness input port R1 and the brightness output port Q11 are disconnected, the transmission channels R1-Q21 are formed by the brightness input port R1 and the brightness output port Q21, the transmission channels R2-Q12 formed by the brightness input port R2 and the brightness output port Q12 are disconnected, and the transmission channels R2-Q22 are formed by the brightness input port R2 and the brightness output port Q22;
S5, the driver 100 extracts the brightness data corresponding to the LED21 from the first data, sends the brightness data to the brightness input port R1 through a second path (such as a path for transmitting the brightness data DL1 in FIG. 3), extracts the brightness data corresponding to the LED22 from the first data, sends the brightness data corresponding to the LED21 to the brightness input port R2 through the second path (such as a path for transmitting the brightness data DL2 in FIG. 3), outputs the brightness data corresponding to the LED21 and the capacitor C21 through the transmission paths R1-Q21, lights the LED21 and charges the capacitor C21, and at the moment, the capacitor C11 is in a discharging state and provides the brightness data for the LED11, so that the LED11 can be continuously lighted, outputs the brightness data corresponding to the LED22 and the capacitor C22 through the transmission paths R2-Q22, lights the LED22, and charges the capacitor C22, and at the moment, the capacitor C12 is in a discharging state and provides the brightness data for the LED12, so that the LED12 can be continuously lighted;
S6, the driver 100 sends address data corresponding to the third color LEDs (namely the LEDs 31 and the LEDs 32) to the two channel switching modules 200 through a first channel (such as a channel for transmitting the address data DD in FIG. 3), so that the transmission channels R1-Q21 formed by the brightness input port R1 and the brightness output port Q21 are disconnected, the transmission channels R1-Q31 are formed by the brightness input port R1 and the brightness output port Q31, the transmission channels R2-Q22 formed by the brightness input port R2 and the brightness output port Q22 are disconnected, and the transmission channels R2-Q32 are formed by the brightness input port R2 and the brightness output port Q32;
S7, the driver 100 extracts the brightness data corresponding to the LED31 from the first data, sends the brightness data to the brightness input port R1 through a second path (such as a path for transmitting the brightness data DL1 in FIG. 3), extracts the brightness data corresponding to the LED32 from the first data, sends the brightness data corresponding to the LED31 to the brightness input port R2 through the second path (such as a path for transmitting the brightness data DL2 in FIG. 3), outputs the brightness data corresponding to the LED31 and the capacitor C31 through the transmission paths R1-Q31, lights the LED31 and charges the capacitor C31, and at the moment, the capacitor C21 is in a discharging state and provides the brightness data for the LED21, so that the LED21 can be continuously lighted, outputs the brightness data corresponding to the LED32 and the capacitor C32 through the transmission paths R2-Q32, lights the LED32, and charges the capacitor C32, and at the moment, the capacitor C22 is in a discharging state and provides the brightness data for the LED22, so that the LED22 can be continuously lighted;
s8, the transmission paths R1-Q31 formed by the brightness input port R1 and the brightness output port Q31 are disconnected, the transmission paths R2-Q32 formed by the brightness input port R2 and the brightness output port Q32 are disconnected, the capacitor C31 is in a discharging state and provides brightness data for the LED31, so that the LED31 can be continuously lighted, and the capacitor C32 is in a discharging state and provides brightness data for the LED32, so that the LED32 can be continuously lighted.
After that, the driver 100 acquires the next frame data signal DI and performs the above steps S1 to S8 again until the data signal DI is not acquired any more.
Based on the same inventive concept, the embodiment of the present invention further provides a backlight board, the implementation principle of the backlight board is similar to that of the backlight driving device, and the specific implementation manner of the backlight board can refer to the embodiment of the backlight driving device, and the repetition is omitted.
Specifically, as shown in fig. 7, a backlight board provided in an embodiment of the present invention includes: n colors of LEDs, and a backlight driving device 701 as described in the above. Thus, when there are multiple LEDs on the backlight board, fewer backlight driving devices 701 (i.e., fewer drivers) are provided to drive the LEDs, thereby reducing the complexity of the wiring on the backlight board.
Based on the same inventive concept, the embodiment of the present invention further provides a liquid crystal display, the implementation principle of the liquid crystal display is similar to that of the backlight driving device, and the specific implementation manner of the liquid crystal display can refer to the embodiment of the backlight driving device, and the repetition is omitted.
Specifically, as shown in fig. 8, a liquid crystal display provided in an embodiment of the present invention includes: a display panel 801, and a backlight 802 as described above; the backlight plate 802 is for: a backlight is provided to a backlight face of the display panel 801 so that the display panel 801 displays based on the backlight.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
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| EP2299434A4 (en) * | 2008-07-11 | 2012-01-18 | Sharp Kk | Backlight drive device, display device using the same, and backlight drive method |
| US9153171B2 (en) * | 2012-12-17 | 2015-10-06 | LuxVue Technology Corporation | Smart pixel lighting and display microcontroller |
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