CN111710312B - Drive circuit, LCD display screen and electronic equipment - Google Patents
Drive circuit, LCD display screen and electronic equipment Download PDFInfo
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- CN111710312B CN111710312B CN202010639518.5A CN202010639518A CN111710312B CN 111710312 B CN111710312 B CN 111710312B CN 202010639518 A CN202010639518 A CN 202010639518A CN 111710312 B CN111710312 B CN 111710312B
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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
- G09G3/36—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 using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
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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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- Computer Hardware Design (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application provides a drive circuit, LCD display screen and electronic equipment, every drive unit includes driver chip and chip controller, signal end and chip controller's the control end through control signal line connection driver chip, and be located driver chip with the crossing part of arbitrary two crossing control signal lines, be located the conducting layer with the rest of arbitrary two crossing control signal lines, make the cross layout that has the base plate of individual layer conducting layer and can realize a plurality of control signal lines, reduce the resistance of base plate, make control be located the control chip's at both ends amplitude difference reduce, driver chip can act according to predetermined control signal, and then extinguish according to predetermined mode control luminescence unit.
Description
Technical Field
The application relates to the technical field of display equipment, in particular to a driving circuit, an LCD display screen and electronic equipment.
Background
With the development of technology, Liquid Crystal displays (LCD displays for short) have become important components of many electronic devices. An LCD display screen is generally composed of a cover plate, a liquid crystal panel, and a backlight structure. The cover plate is positioned above the liquid crystal panel and used for protecting the liquid crystal panel. The backlight structure is positioned below the liquid crystal panel and used for providing backlight for the liquid crystal panel.
Backlight structure includes reflective membrane, light diffusing film and backlight source etc. and reflective membrane and light diffusing film are used for making the light distribution that backlight source provided more even. The backlight light source comprises a light emitting unit, a driving circuit and a power supply circuit. The light-emitting unit generally comprises a plurality of light-emitting diodes, the driving circuit comprises a substrate, a plurality of driving chips and a chip controller, the driving chips and the chip controller are arranged on the substrate, a conductive layer is arranged on the substrate, a circuit is printed on the conductive layer, the driving chips are connected with the chip controller through the printed circuit, and the chip controller controls driving signals output by the driving chips so as to control the on and off of the light-emitting diodes. Usually, a chip controller needs to control a plurality of driver chips, each driver chip is provided with a plurality of wiring ports, for example: in order to cross-connect the control signal lines, power lines, and the like, the substrate is generally provided with a plurality of conductive layers, and one type of connection line is printed on each conductive layer.
However, the inventor finds that the display screen with the structure has the technical problem that the light-emitting units cannot be controlled to be turned on or off in a preset mode.
Disclosure of Invention
The application provides a drive circuit, LCD display screen and electronic equipment, aims at solving the technical problem that current display screen can't control the luminous unit to extinguish according to the preset mode.
In a first aspect, the present application provides a driving circuit comprising: a substrate and at least one driving unit on the substrate;
the substrate comprises a conductive layer, each driving unit comprises at least two driving chips, a chip controller and a control signal line, and each driving chip is provided with a signal end and a driving end;
the signal end of each driving chip is connected with the control end of the chip controller through a control signal line, the driving end of each driving chip is used for being connected with the driving end of the light-emitting unit, the intersecting part of any two intersecting control signal lines is located on the driving chip, and the rest part of any two intersecting control signal lines is located on the conducting layer.
Optionally, the at least two driving chips are arranged on the substrate in a rectangular array, the signal ends of the driving chips comprise row signal ends, and the control end of the chip controller comprises a first control end;
a first row of control signal lines are transversely arranged on the two conducting layers which are positioned in the same row and between the adjacent driving chips, and a second row of control signal lines are transversely arranged on each driving chip;
the first row control signal line and the second row control signal line connect the row signal end of each driving chip with the first control end of the chip controller.
Optionally, the signal terminal of the driving chip includes a column signal terminal, and the control terminal of the chip controller includes a second control terminal;
the two conducting layers which are positioned in the same column and between the adjacent driving chips are longitudinally provided with a first column of control signal lines, the longitudinal direction of each driving chip is provided with a second column of control signal lines, and the second column of control signal lines and the second row of control signal lines are intersected on the driving chips;
the first column control signal line and the second column control signal line connect the column signal end of each driving chip with the second control end of the chip controller.
Optionally, a signal buffer circuit is provided at an intersection of the control signal lines.
Optionally, a signal buffer circuit is disposed on the second row control signal line, and the signal buffer circuit is configured to buffer signals in two opposite transmission directions in the second row control signal line.
Optionally, a signal buffer circuit is disposed on the second column of control signal lines, and the signal buffer circuit is configured to buffer signals in a single transmission direction in the second column of control signal lines.
Optionally, each driving unit is provided with a chip power line, and each driving chip is further provided with a power supply end;
the power supply end of each driving chip is used for being connected with the power supply unit through a chip power line, the intersection part of the chip power line and the control signal line is located on the driving chip, and the rest parts of the chip power line and the control signal line are located on the conducting layer.
Optionally, each driving unit is provided with a chip ground wire, and each driving chip further comprises a ground terminal;
the grounding end of each driving chip is grounded through a chip grounding wire, the intersection part of the chip grounding wire and the control signal wire is positioned on the driving chip, and the rest parts of the chip grounding wire and the control signal wire are positioned on the conductive layer.
Optionally, each drive unit is provided with an additional power supply line;
the additional power line is used for being connected between a power supply end of the light-emitting unit and the power supply circuit, the intersection part of the additional power line and the control signal line is located on the driving chip, and the rest parts of the additional power line and the control signal line are located on the conducting layer.
Optionally, the substrate further comprises a glass substrate, and the conductive layer is located on the glass substrate.
Optionally, the row signal terminal of the driver chip is configured to receive a scan signal, and the column signal terminal of the driver chip is configured to receive a data signal, where the data signal is generated from display data displayed on the LCD display screen.
In a second aspect, the present application provides an LCD display screen comprising: the backlight structure comprises a driving circuit and a plurality of light-emitting units, wherein each driving chip in the driving circuit is connected with at least one light-emitting unit.
Optionally, each light emitting unit comprises at least one light emitting diode.
In a third aspect, the present application provides an electronic device comprising the LCD display screen according to the second aspect and the alternative.
The application provides a drive circuit, LCD display screen and electronic equipment, every drive unit includes driver chip and chip controller, signal end and chip controller's the control end through control signal line connection driver chip, and be located driver chip with the crossing part of arbitrary two crossing control signal lines, be located the conducting layer with the rest of arbitrary two crossing control signal lines, make the cross layout that has the base plate of individual layer conducting layer and can realize a plurality of control signal lines, reduce the resistance of base plate, make control be located the control chip's at both ends amplitude difference reduce, driver chip can act according to predetermined control signal, and then extinguish according to predetermined mode control luminescence unit. In addition, the resistance of the substrate is reduced, and the difference of the amplitude of the voltage applied to the light emitting units at the two ends is reduced, so that the backlight structure provides a backlight source with uniform intensity, and further the brightness of each area in the display screen is uniform.
Drawings
FIG. 1 is a schematic structural diagram of an LCD display screen provided in the present application;
FIG. 2 is a diagram of a prior art driving circuit;
FIG. 3 is a structural view of a cross-section of a substrate in the prior art;
fig. 4 is a schematic diagram of a driving circuit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a substrate according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a driving circuit according to a second embodiment of the present application;
fig. 7 is a partial schematic diagram of a driving circuit according to a second embodiment of the present application;
fig. 8 is a partial schematic diagram of a driving circuit according to a second embodiment of the present application;
fig. 9 is a schematic diagram of a driving circuit according to a third embodiment of the present application;
fig. 10 is a schematic diagram of a connection port of a driver chip according to a third embodiment of the present application.
Detailed Description
To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As technology advances, LCD displays become an important component of many electronic devices, such as: a television configured with an LCD display screen, a monitor configured with an LCD display screen, etc. As shown in fig. 1, the LCD display screen generally comprises a cover plate 101, a liquid crystal panel 102, a backlight structure 103, and a circuit board (not shown). The cover plate 101 is located above the liquid crystal panel 102 and is used for protecting the liquid crystal panel 102. The backlight structure 103 is located below the liquid crystal panel 102 and is used for providing a backlight source for the liquid crystal panel 102, and the circuit board is connected to the liquid crystal panel and is used for driving the liquid crystal panel to display different contents.
In the following, a backlight structure in an LCD panel is described with emphasis, and the backlight structure generally includes a light reflecting film, a light diffusing film, a backlight source and the like, the backlight source is used for providing light, and the light reflecting film and the light diffusing film are used for making the light distribution provided by the backlight source more uniform. The backlight light source is composed of a light emitting unit, a driving circuit and a power supply circuit. The light emitting unit is generally composed of a plurality of light emitting diodes. The driving circuit comprises a substrate, a plurality of driving chips and a chip controller. The substrate is composed of a bottom plate and a conductive layer. The conductive layer is disposed on the base plate, and a printed circuit is prepared on the conductive layer, and the driving chip and the chip controller are disposed on the substrate. As shown in fig. 2, the driving chip is connected to the chip controller through the printed circuit, and the chip controller controls the driving signal output by the driving chip to control the on/off of the light emitting diode. Usually, a chip controller needs to control a plurality of driver chips, each driver chip is provided with a plurality of wiring ports, for example: as shown in fig. 3, a plurality of conductive layers are generally provided on a substrate, and a printed circuit is disposed on each conductive layer, in order to cross-connect a plurality of driver chips.
However, the inventor finds that the display screen with the structure has the technical problem that the light-emitting units cannot be controlled to be turned on or off in a preset mode. The inventor finds that the above problems mainly occur in the light emitting unit at one end, and further finds that the driving chips at two ends in the conventional driving circuit have large amplitude difference of output driving signals, thereby causing the above problems.
The application provides a driving circuit, an LCD display screen and an electronic device, aiming at solving the problems. The invention conception of the application is as follows: by reducing the resistance of the substrate, the amplitude difference of the driving signals output by the driving chips at the two ends is reduced, and the technical problem can be solved. The specific implementation mode is as follows: and arranging an intersection point between any two crossed control signal lines on the driving chip, wherein the control signal lines are used for connecting the driving chip and the chip controller. That is, there is no intersection point of the control signal lines on the substrate, and only a single conductive layer is needed to be disposed on the substrate, so that the non-intersection portion between any two intersecting control signal lines can be disposed on the conductive layer. And the control signal line on the conductive layer and the control signal line on the driving chip are connected with the driving chip and the chip controller together. And the substrate is only provided with a single conducting layer, so that the resistance of the substrate is reduced.
As shown in fig. 4, the present application provides a driving circuit for a backlight structure of an LCD panel, the driving circuit 20 (not shown) includes: a base plate 21 and at least one drive unit 22.
Wherein each driving unit 22 is located on the substrate 21, as shown in fig. 5, the substrate 21 includes a single conductive layer 211 and a bottom plate 212. The bottom plate 212 is located below the conductive layer 211, a printed circuit is printed on the conductive layer, and the connection between the devices in the driving circuit 20 is realized by the printed circuit, for example: the connections between the individual drive units, and the connection between each drive unit 22 and the light emitting unit. The light emitting unit is generally composed of a plurality of light emitting diodes, and is turned on and off under the control of the driving signal output from the driving unit 22.
Each driving unit 22 includes at least two driving chips 221, a chip controller 222, and a control signal line 223. Each driving chip 221 is provided with a signal end and a driving end, each chip controller 222 is provided with a control end, the signal end of each driving chip 221 is connected with the control end of the chip controller 222 through a control signal line 223, and the driving chip 221 receives a control signal sent by the chip controller 222 through the signal end. The driving end of the driving chip 221 is connected to the driving end of the light emitting unit, and the driving chip sends a driving signal to the light emitting unit through the driving end, so as to control the light emitting unit to be turned on or turned off.
The intersection of any two intersecting control signal lines is located on the driver chip and the remainder of any two intersecting control signal lines is located on the conductive layer. That is, the conductive layer does not have the intersection of the control signal lines, and the single conductive layer can lay out the non-intersection part of the control signal. When there are multiple control signal lines between the driver chip 221 and the chip controller 222, the intersecting control signal lines may be control signal lines connected to the same driver chip, or control signal lines connected to different driver chips.
The driver chip laid out with the intersection portion of the control signal line may be a driver chip connected to the intersection control signal line, or may be an adjacent driver chip of a driver chip connected to the intersection control signal line, which is not limited herein.
The operating principle of the driving circuit is described below: the intersection part of the control signal line positioned on the driving chip and the rest part of the control signal line positioned on the conductive layer jointly realize the connection between the signal end of the driving chip and the control end of the chip controller, the chip controller sends a control signal to the driving chip through the control signal line, so that the driving chip acts according to the control signal and outputs a corresponding driving signal through the driving end, and the driving signal is used for controlling the on-off of the light-emitting unit, further realizing the on-off of the light-emitting unit according to a preset mode and providing a backlight light source for the liquid crystal panel.
In the driving circuit provided by the embodiment of the application, the intersecting part of any two intersecting control signal lines is located on the driving chip, and the non-intersecting part is located on the conducting layer, so that the intersecting point of the control signal lines does not exist on the conducting layer, the single-layer conducting layer can arrange the non-intersecting part of the control signal, the substrate resistance is reduced, the difference of the driving signals output by the driving chips located at the two ends is reduced, all the light-emitting units can be turned on and off according to a preset mode, and a backlight light source is provided for the liquid crystal panel.
As shown in fig. 6, the present application provides a driving circuit for a backlight structure of an LCD panel, the driving circuit 20 (not shown) includes: a base plate 21 and at least one drive unit 22.
Each driving unit 22 includes at least two driving chips 221, a chip controller 222, and a control signal line 223. In contrast to the embodiment shown in fig. 4: all the driving chips 221 are arranged on the substrate in a rectangular array, and the signal terminals of the driving chips include row signal terminals and column signal terminals, and correspondingly, the control terminal of the controller includes a first control terminal and a second control terminal.
And a first row of control signal lines are transversely arranged on the two conducting layers positioned in the same row and between the adjacent driving chips, and a second row of control signal lines are transversely arranged on each driving chip. And a first column of control signal lines are longitudinally arranged on the two conductive layers positioned between the adjacent driving chips in the same column, and a second column of control signal lines are longitudinally arranged on each driving chip. The second column control signal line and the second row control signal line are intersected on the driving chip.
The layout of the first column control signal line, the second column control signal line, the first row signal line, and the second row control signal line is described below with reference to fig. 7 and 8. As shown in fig. 7, only 6 driver chips located in the nth to n +1 th rows and in the m-1 th to m +1 th columns among the driver chips arranged in a matrix array are shown. In order to simplify the schematic diagram, only the connecting lines of the driving chips in the (n) th row and the (m-1) th column are marked, and the connecting lines of other driving chips are the same as the driving chips in the (n) th row and the (m-1) th column.
The driving chip positioned on the m-1 th column of the nth row and the driving chip positioned on the m-1 th column of the nth row belong to the driving chips which are positioned on the same row and are adjacent, and a first row of control signal lines are transversely arranged on the conductive plate between the two chips. Correspondingly, a first row of control signal lines is transversely arranged on the conductive plate between the driving chip of the nth row and the mth column and the driving chip of the nth row and the mth +1 column.
The driving chip positioned on the nth row and the mth column and the driving chip positioned on the (n + 1) th row and the mth column belong to the driving chips which are positioned on the same column and are adjacent, and a first column of control signal wires are longitudinally arranged on the conductive plate between the two chips.
As shown in fig. 8, a second row control signal line is transversely disposed on the driving chip of the nth row and the mth column, and a second column control signal line is longitudinally disposed, where the second column control signal line and the second row control signal line intersect on the driving chip. In order to realize the crossed layout of the second row control signal lines and the second column control signal lines on the driving chip, two layers of conducting layers are arranged on the driving chip, wherein one conducting layer is distributed with the second row control signal lines, and the other conducting layer is distributed with the second column control signal lines.
The first row control signal line and the second row control signal line connect the row signal end of each driving chip with the first control end of the chip controller. The first column control signal line and the second column control signal line connect the column signal end of each driving chip with the second control end of the chip controller. The driving chip 221 receives the row control signal sent by the chip controller 222 through the row signal terminal, and the driving chip 221 receives the column control signal sent by the chip controller 222 through the column signal terminal.
With continued reference to fig. 6, the driving chip further has a power source terminal and a ground terminal (not shown). Each driving unit further includes a chip power line 224 and a chip ground line (not shown). The power supply end of each driving chip is used for being connected with the power supply unit through a chip power line, the intersection part of the chip power line and the control signal line is located on the driving chip, and the rest parts of the chip power line and the control signal line are located on the conducting layer.
The chip power line layout is described below with reference to fig. 7 and 8. A first row chip power supply line is arranged laterally on a conductive plate between the driving chip of the m-1 th column of the nth row and the driving chip of the m-th column of the nth row as shown in fig. 7. And a first column chip power line is longitudinally arranged on the conductive plate between the driving chip of the nth row and the mth column and the driving chip of the (n + 1) th row and the mth column.
As shown in fig. 8, a second row of chip power lines is transversely disposed on the nth row and mth column of driver chips, and a second column of chip power lines is longitudinally disposed, where the second column of chip power lines and the second row of chip power lines intersect on the driver chips. Two conductive layers are added on the surface of the driving chip, wherein one conductive layer is distributed with a second row of chip power lines, and the other conductive layer is distributed with a second column of chip power lines.
The first row of chip power lines and the second row of chip power lines connect the row power terminals of each driving chip with the first power terminal of the power supply circuit. The first column control signal line and the second column control signal line connect the column power supply terminal of each driver chip with the second power supply terminal of the power supply circuit. The power supply circuit supplies power to the driving chip through the row power supply end and the column power supply end.
The driving chip is also provided with a grounding terminal. Each driving unit further includes a chip ground line. The power supply end of each driving chip is used for being connected with the power supply unit through a chip power line, the intersection part of the chip power line and the control signal line is located on the driving chip, and the rest parts of the chip power line and the control signal line are located on the conducting layer.
The following describes the chip ground line layout with reference to fig. 7 and 8. A first chip ground line is longitudinally arranged on the conductive plate between the driving chip of the mth column in the n +1 th row and the driving chip of the mth column in the nth row as shown in fig. 7. As shown in fig. 8, a second chip ground line is longitudinally provided on the driver chip in the nth row and the mth column. And adding a conductive layer on the surface of the driving chip, and laying a chip grounding wire on the conductive layer. The first row of chip grounding lines and the second row of chip grounding lines ground the grounding end of each driving chip. Here, the chip ground lines may be laid out laterally on the conductive plate and the driving chip, and the wiring direction of the chip ground lines is not limited here.
With continued reference to fig. 6, each drive unit further includes an additional power line 225. The additional power line is used for being connected between a power supply end of the light-emitting unit and the power supply circuit, the intersection part of the additional power line and the control signal line is positioned on the driving chip, and the rest parts of the additional power line and the control signal line are positioned on the conductive layer.
Additional line layouts are described below in conjunction with fig. 7 and 8. The first additional power line is arranged on the conductive plate between the driving chip of the (n) th row and (m-1) th column and the driving chip of the (n) th row and (m) th column as shown in fig. 7, and two adjacent first additional power lines are connected with each other. As shown in fig. 8, a second additional power line in an H-shape is longitudinally disposed on the driving chip in the nth row and the mth column. And adding a conductive layer on the surface of the driving chip, and laying out a second additional power line on the conductive layer. The first additional power line and the second additional power line connect a power terminal of the light emitting unit with the power supply circuit. Here, the additional power lines may be laid out laterally on the conductive plate and the driving chip, and here, the wiring direction of the additional power lines is not limited.
In order to increase the reliability of the driving circuit, a signal buffer circuit is provided at the intersection of the control signal lines to compensate for the loss of the signal on the control signal lines during transmission. And determining the caching direction of the caching circuit according to the characteristics of the transmission signals on the control signal line, wherein the signal caching circuit is arranged on the second row of control signal line and is used for caching the signals in the two transmission directions in the second row of control signal line. And the second row of control signal lines are provided with a signal buffer circuit which is used for buffering signals in a single transmission direction in the second row of control signal lines.
As a preferred scheme, the substrate middle base plate is a glass base plate, after a circuit is printed on the glass base plate through vapor deposition, and then the treatment for improving the conductivity is performed, the resistance of the driving circuit can reach a preset requirement, so that the driving circuit can control the on and off of the light-emitting unit according to a preset mode.
The operating principle of the driving circuit is described below: the intersection part of the chip power line on the driving chip and the rest part of the chip power line on the conductive layer are connected with the power supply circuit together to realize that the driving chip is connected with the power supply, and the intersection part of the chip ground wire on the driving chip and the rest part of the chip ground wire on the conductive layer are connected with the driving chip together to realize that the driving chip is grounded. The intersection part of the additional power line on the driving chip and the rest part of the additional power line on the conductive layer jointly realize that the driving chip, the light-emitting unit and the power supply circuit form a complete circuit. The intersection part of the control signal line positioned on the driving chip and the rest part of the control signal line positioned on the conductive layer jointly realize the connection between the signal end of the driving chip and the control end of the chip controller. The chip controller sends a control signal to the driving chip through the control signal line, so that the driving chip acts according to the control signal, and outputs a corresponding driving signal through the driving end, and the driving signal is used for controlling the on and off of the light-emitting unit, so that the light-emitting unit is turned on and off according to a preset mode, and a backlight light source is provided for the liquid crystal panel.
In the driving circuit provided by the embodiment of the application, the intersection points between the control signal lines between the chip controller and the driving chip and between other auxiliary lines of the driving chip are arranged on the driving chip, so that the intersection points do not exist on the substrate, and the non-intersection parts of all the control signals and other lines can be distributed by the single-layer conductive plate, so that the resistance of the substrate is reduced. The amplitude difference of the control signals for controlling the driving chips at the two ends is reduced, the driving chips can act according to the preset control signals, the voltage amplitude difference applied to the light-emitting units at the two ends is reduced, the backlight structure provides backlight sources with uniform intensity, and the brightness of each area in the display screen is uniform.
The present application provides a driving circuit for a backlight structure of an LCD panel, as shown in fig. 9, which includes: a substrate (shown in the figure as a backplane) and 2 drive units.
Wherein, each driving unit comprises 648 driving chips, 1 chip controller and control signal lines. Each driving unit is connected with 2592 light emitting units, and each driving chip is connected with 4 light emitting units.
Each driving chip has a row signal terminal, a column signal terminal, a chip power terminal (not shown), and a ground terminal (not shown). In each driving unit, 27 row signal lines are provided, each row signal line for transmitting a scan signal. There are 24 column signal lines each for transmitting a data signal converted from a video signal to be displayed.
The Chip Controller is usually packaged by using COF (full name: Chip On Flex) technology, and is connected with a central control board TCON (full name: Timing-Controller) through a bus, where the TCON is a core circuit for controlling the Timing operation of the driving Chip.
There is digital signal transmission and setting signal transmission between the TCON and the chip controller, and as shown in fig. 10, the TCON converts an input video signal (e.g., LVDS signal) into a data signal form (e.g., mini-LVDS signal) used by the driving circuit, and transmits the converted data signal to the chip controller in the driving circuit. The TCON transmits SPI data or I2C data to the chip controller, setting the chip controller. The chip controller converts the scanning signal and the data signal into a scanning signal Vscan and a data signal Vdata which can be recognized by each driving chip, and the driving chips are timely turned on and off under the driving of the scanning signal and the data signal to control the on and off of the light emitting units Izone1 to Izone 4.
The scan signal Vscan and the data signal Vdata are both square wave signals with a maximum amplitude of 3.3V, and the power supply circuit provides the driving chip with a voltage signal with an amplitude of 3.3V. The current flowing through each led is also a square wave signal with an amplitude of 25 mA.
The embodiment of the present application further provides an LCD display screen, and the LCD display screen includes: the backlight structure comprises the driving circuit and a plurality of light-emitting units, wherein each driving chip in the driving circuit is connected with at least one light-emitting unit. Each light emitting unit includes at least one light emitting diode.
The embodiment of the application also provides electronic equipment which comprises the LCD display screen provided by the embodiment.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A driver circuit, comprising: a substrate and at least one driving unit on the substrate;
the substrate comprises a conductive layer, each driving unit comprises at least two driving chips, a chip controller and a control signal line, and each driving chip is provided with a signal end and a driving end;
the signal end of each driving chip is connected with the control end of the chip controller through the control signal line, the driving end of each driving chip is used for being connected with the driving end of the light-emitting unit, the intersection part of any two intersected control signal lines is positioned on the driving chip, and the rest part of any two intersected control signal lines is positioned on the conductive layer; wherein, a signal buffer circuit is arranged at the intersection part of the control signal lines;
the at least two driving chips are arranged on the substrate in a rectangular array, the signal ends of the driving chips comprise row signal ends, and the control end of the chip controller comprises a first control end;
a first row of control signal lines are transversely arranged on the two conducting layers which are positioned in the same row and between the adjacent driving chips, and a second row of control signal lines are transversely arranged on each driving chip;
the first row control signal line and the second row control signal line connect the row signal end of each driving chip with the first control end of the chip controller;
the signal end of the driving chip comprises a column signal end, and the control end of the chip controller comprises a second control end;
a first column of control signal lines are longitudinally arranged on the two conducting layers which are positioned in the same column and between the adjacent driving chips, a second column of control signal lines are longitudinally arranged on each driving chip, and the second column of control signal lines and the second row of control signal lines are intersected on the driving chips;
the first row control signal line and the second row control signal line connect the row signal end of each driving chip with the second control end of the chip controller;
and two conductive layers are arranged on the driving chip, wherein one conductive layer is distributed with the second row control signal lines, and the other conductive layer is distributed with the second row control signal lines.
2. The driving circuit according to claim 1, wherein a signal buffer circuit is disposed on the second row control signal line, and the signal buffer circuit is configured to buffer signals in two transmission directions in the second row control signal line.
3. The driving circuit according to claim 1, wherein a signal buffer circuit is disposed on the second column control signal line, and the signal buffer circuit is configured to buffer signals in a single transmission direction in the second column control signal line.
4. The drive circuit according to any one of claims 1 to 3, wherein each of the drive units is provided with a chip power supply line, and each of the drive chips is further provided with a power supply terminal;
the power supply end of each driving chip is used for being connected with a power supply unit through the chip power line, the intersection part of the chip power line and the control signal line is located on the driving chip, and the rest parts of the chip power line and the control signal line are located on the conductive layer.
5. The driving circuit according to any one of claims 1 to 3, wherein each driving unit is provided with a chip ground line, and each driving chip further comprises a ground terminal;
the grounding end of each driving chip is grounded through a chip grounding wire, the intersection part of the chip grounding wire and the control signal wire is positioned on the driving chip, and the other parts of the chip grounding wire and the control signal wire are positioned on the conductive layer.
6. A drive circuit as claimed in any one of claims 1 to 3, characterized in that each drive unit is provided with an additional power supply line;
wherein the additional power line is used for being connected between a power supply end of the light-emitting unit and a power supply circuit, an intersection part of the additional power line and the control signal line is positioned on the driving chip, and the other parts of the additional power line and the control signal line are positioned on the conductive layer.
7. The driver circuit of any of claims 1-3, wherein the substrate further comprises a glass backplane, the conductive layer being on the glass backplane.
8. The driving circuit according to any of claims 1 to 3, wherein the row signal terminals of the driving chip are configured to receive a scan signal, and the column signal terminals of the driving chip are configured to receive a data signal, the data signal being generated by display data displayed on the LCD screen.
9. An LCD display screen, comprising: a liquid crystal panel and a backlight structure comprising a plurality of light emitting units and a driving circuit according to any one of claims 1 to 8, wherein each driving chip in the driving circuit is connected to at least one light emitting unit.
10. A display screen as recited in claim 9, wherein each of the light units comprises at least one light emitting diode.
11. An electronic device, characterized in that it comprises an LCD display screen according to claim 9 or 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010639518.5A CN111710312B (en) | 2020-07-06 | 2020-07-06 | Drive circuit, LCD display screen and electronic equipment |
| PCT/CN2020/112762 WO2022007157A1 (en) | 2020-07-06 | 2020-09-01 | Driving circuit, lcd display screen and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010639518.5A CN111710312B (en) | 2020-07-06 | 2020-07-06 | Drive circuit, LCD display screen and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN111710312A CN111710312A (en) | 2020-09-25 |
| CN111710312B true CN111710312B (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010639518.5A Active CN111710312B (en) | 2020-07-06 | 2020-07-06 | Drive circuit, LCD display screen and electronic equipment |
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| CN (1) | CN111710312B (en) |
| WO (1) | WO2022007157A1 (en) |
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| CN112542143A (en) * | 2020-12-03 | 2021-03-23 | Tcl华星光电技术有限公司 | Backlight module and display device |
| CN116047809A (en) * | 2021-12-10 | 2023-05-02 | Tcl华星光电技术有限公司 | Backlight and display device |
| CN114185200B (en) * | 2021-12-13 | 2022-11-08 | Tcl华星光电技术有限公司 | Light source module and display device |
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|---|---|---|---|---|
| GB1190554A (en) * | 1966-12-03 | 1970-05-06 | Int Computers Ltd | Improvements in or relating to Electrical Circuit Structures. |
| CN1177305C (en) * | 1998-08-18 | 2004-11-24 | Lg电子株式会社 | Organic electroluminescent display panel and method for fabricating the same |
| JP3781967B2 (en) * | 2000-12-25 | 2006-06-07 | 株式会社日立製作所 | Display device |
| US7973472B2 (en) * | 2009-04-15 | 2011-07-05 | Global Oled Technology Llc | Display device with polygonal chiplets |
| CN102221752A (en) * | 2010-04-19 | 2011-10-19 | 北京京东方光电科技有限公司 | Liquid crystal panel and manufacturing and maintenance method of liquid crystal panel |
| KR101963784B1 (en) * | 2011-07-20 | 2019-08-01 | 엘지디스플레이 주식회사 | Apparatus and method for driving back light, liquid crystal display device and driving method the same |
| CN106154594B (en) * | 2015-03-31 | 2019-08-13 | 鸿富锦精密工业（深圳）有限公司 | Electric connection structure and array substrate |
| CN105489162A (en) * | 2016-02-19 | 2016-04-13 | 友达光电股份有限公司 | Signal driving circuit of display panel |
| CN106444199A (en) * | 2016-12-23 | 2017-02-22 | 厦门天马微电子有限公司 | Array substrate, display panel and display device |
| CN109375422B (en) * | 2018-12-24 | 2021-11-19 | 厦门天马微电子有限公司 | Backlight module and display device |
| CN208460010U (en) * | 2019-01-02 | 2019-02-01 | 展讯通信（上海）有限公司 | The reusable chip of pin and circuit, virtual coin dig mine machine and computer server |
| CN112242368B (en) * | 2020-10-19 | 2022-11-15 | Oppo广东移动通信有限公司 | Chip and electronic device |
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| CN111710312A (en) | 2020-09-25 |
| WO2022007157A1 (en) | 2022-01-13 |
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