CN114360450A - Line and row high-integration LED display driving chip and application - Google Patents
Line and row high-integration LED display driving chip and application Download PDFInfo
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Abstract
The invention discloses a row and column high-integration LED display driving chip and application thereof, and belongs to the technical field of LED driving chips. Aiming at the problems that the display effect is poor in the LED drive with high integration level when the LED display array is driven by the traditional drive chip with separated rows and columns in the prior art, the invention integrates the row and column drive in the chip, meets the small-spacing characteristic of the Mini-LED and the Micro-LED, has high integration level, enables the chip to generate better LED drive effect, is combined with the PCB in practical application, reduces the interference caused by row and column wiring, and can optimize the number of the wiring layers and the layers of the PCB, thereby reducing the wiring and meeting the effect of the whole LED board.
Description
Technical Field
The invention relates to the technical field of LED driving chips, in particular to a row and column high-integration LED display driving chip and application thereof.
Background
With the popularization and development of the LED display field, the application of the LED display screen can be seen on more and more occasions, and the LED display screen can visually display information for users. In the development of the LED, the product application with low cost and low power consumption can be realized, so that a user can select a corresponding LED product according to specific use requirements and iterate the product according to subsequent upgrading. Under the technical development of LED driving, the better display effect of the LED display screen can be realized.
In the design of the traditional LED display screen, the size of a common LED lamp bead is about 3-5mm, and the LED display screen is formed by splicing a plurality of LED modules. Under the traditional scheme, the size of a single LED is larger than that of a used driving chip, the combination of a row driving chip and a column driving chip is usually used for realizing control, and the LED display module is large, so that the arrangement of row driving and column driving is not required excessively. This approach can result in the integration of multiple chips for large area LED display applications.
However, with the development of LED technology, the requirement of users for display effect is further improved, and the traditional LED lamp bead cannot meet the user requirement, so various technologies are continuously appearing, and the Mini-LED and Micro-LED technologies are paid more attention to by more manufacturers. Because the display unit size of the Mini-LED and the Micro-LED is about 0.3-1.5mm, the single LED lamp can be smaller in size and more in total amount, and the independent lamp bead switch is controlled, so that a better effect is achieved. Since the order of magnitude of the LED display unit is reduced, the area of the LED module is also reduced, and the area of the driving chip under the conventional scheme is larger than that of the new LED module, thereby causing a wiring problem.
If when the display element is less, use the framework of line driver chip and row driver chip, can cause like this because the line problem of walking that the chip size brought, the lamp pearl can not closely coincide or the PCB number of piles needs to increase in order to satisfy the line demand of walking, just so reduced the lamp pearl and become to bring the advantage that promotes the display effect for a short time. In addition, the PCB is complicated in routing and stacked, and interference is generated on signals to a certain extent. When the driving signal is small, the display effect is greatly affected by the interference.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems that the display effect is poor in the LED drive with high integration level when the LED display array is driven by the traditional drive chip with separated rows and columns in the prior art, the invention provides the LED display drive chip with high integration level and the application thereof.
2. Technical scheme
The purpose of the invention is realized by the following technical scheme.
A high integrated LED display driver chip of ranks, drive the integration in the chip of line and column driver; the chip comprises a current reference unit, an image parameter writing unit, an SRAM unit, a configurable register unit, a row switch output array unit and a column constant current output array unit; and the input signal is sent to the current reference unit and the image parameter writing unit, passes through the SRAM unit and the configurable register unit, and is output under the control of the row switch output array unit and the column constant current output array unit.
Compared with the traditional column driving, the invention integrates the row driving and the column driving in the chip, and adds the row switch array and the column constant current output array, thereby realizing that the row driving and the column driving can share the generated current value and the image data. The problem of the chip integration level is solved by innovating the chip structure. The invention integrates the line-row drive in the chip, and is controlled by the same external signal in the same chip, thereby reducing the interference caused by transmission.
Further, the chip includes an input terminal SIN for connecting an input image signal and a control signal, an input terminal SCLK for connecting an input clock signal, an output terminal SOUT for connecting an input terminal of the next chip, and an output terminal OUT for connecting a column signal in the display array and an output terminal LINE for connecting a row signal in the display array. The column output OUT and the LINE output LINE of the present invention are driven by multiple outputs according to the design.
Furthermore, the chip comprises a DAC small current precision circuit unit for generating the DAC small current and finishing DAC small current precision copying. The ultra-high density LED requires a small current for driving, and the current accuracy during the small current driving is ensured, so that a good effect can be achieved when the gray scale is small. According to the invention, the DAC low-current precise circuit unit is arranged, and different currents are adjusted and generated to realize the control of the gray scale of the LED lamp bead.
Furthermore, the chip comprises a PAM and PWM adjusting unit for PAM and PWM adjustment. The invention integrates PAM and PWM adjusting unit in the chip, and can realize adjustment when the gray scale is smaller and realize larger gray scale by PAM Pulse Amplitude Modulation and PWM Pulse width Modulation, which is beneficial to gray scale control under high refresh rate.
A display module comprises a row-column high-integration LED display driving chip, and LED lamp beads and the driving chip are respectively arranged on the front side and the back side of a PCB.
The design method of the chip can provide convenient PCB wiring and layer number requirements, and partial signal lines are embedded between the PCBs for wiring through the forward and reverse sides of the PCBs by arranging the corresponding driving chip behind the PCBs of the display unit, thereby avoiding the interference caused by external wiring. Because the single lamp bead is smaller, the LED display module and the chip can be arranged on the PCB with the same area through the chip structure.
A chip driving method is characterized in that a plurality of LED display driving chips with high integration of rows and columns are cascaded to realize the driving display of a display array. The output end SOUT of the cascade and first chip is connected with the input section SIN of the next chip, the first chip is controlled by the SIN and SCLK provided by the external control card, wherein SCLK is used for unifying clocks of all chips, the SIN signal is received by the first chip, the output content of the first chip is removed, and the signal is converted into a driving signal which is used for outputting SOUT to the next chip.
Furthermore, for a display array with an area of m × n, max { m, n } driving chips are set, i.e. the maximum value of m and n, where m and n are integers greater than zero. The driving method reduces the practicability of the driving chip, and can complete the connection of a larger lamp panel through more LED display arrays and driving chips.
Furthermore, according to the number x of row signal outputs and the number x of column signal outputs of the driving chips, corresponding rows and columns of the display array are driven, that is, the first driving chip drives the 1 st row to the x th row and the 1 st column to the x th column of the display array, the second driving chip drives the x +1 st row to the 2x th row and the x +1 st column to the 2x th column of the display array, …, and so on.
Further, m is the same as n. The equal m and n numerical values indicate that the LED display array is in a square structure, and the connection between the LED display array and the driving chip only needs to be in diagonal distribution according to the number of rows and columns, so that the final driving of the lamp panel can be completed.
Furthermore, m is different from n, and only the column signal/row signal is controlled to be turned on or the column drive/row drive is independently used for the chips with the difference of m and n.
The invention discloses a line and column high integration LED display driving chip structure, which can meet the small spacing characteristic of a Mini-LED and a Micro-LED by integrating a line driver and a column driver in one chip, and realize ultra-high density LED driving. The structure of the invention can reduce the interference caused by row and column wiring, and can optimize the wiring and the layer number of the PCB, thereby reducing the wiring.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
according to the invention, a novel row-column highly integrated LED display driving structure is designed, and row driving and column driving of the LED driving unit are integrated in the same chip, so that a high-integration LED driving scheme is realized. Through the arrangement of the structure, the small current drive meeting requirements of the Mini-LED and the Micro-LED can be obtained, and a better display effect is obtained. The row signals and the column signals are integrated in the same chip, so that interference caused by transmission can be avoided, external control signals can be controlled uniformly, and time delay caused by transmission is reduced.
The row and column highly integrated LED display driving structure provided by the invention can reduce the wiring difficulty on the PCB, and can be highly integrated with the display unit, so that the influence of external factors such as the increase of the number of layers of the PCB, the complex wiring and the like on the effect of the driving chip is avoided. The driving chip and the display module are combined highly, and the high integration requirement of the final LED display screen can be met.
Drawings
FIG. 1 is a schematic diagram of a driving chip according to the present invention;
FIG. 2 is a schematic diagram of a column driver chip structure according to the present invention;
FIG. 3 is a schematic diagram illustrating a control method of a driver chip according to the present invention;
FIG. 4 is a schematic diagram of a driving chip according to the present invention;
FIG. 5 is a schematic diagram of an overall module operation of the present invention;
the labels in the figures indicate:
100. a PCB board; 101. LED lamp pearl, 102, driver chip.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples.
Example 1
As shown in fig. 1, in the LED display driving chip of this embodiment, the constant current output array is adjusted to be a row switch output array unit and a column constant current output array unit, so that current values and image data generated by row and column driving can be shared, and in the same chip, the LED display driving chip is controlled by the same external signal, so that interference caused by transmission can be reduced. As shown in fig. 1, the structure includes a current reference unit, an image parameter writing unit, an SRAM unit, a configurable register unit, a column constant current output array unit, and a row switch output array unit, where an input signal is sent to the current reference unit and the image parameter writing unit, and is output under the control of the row switch output array unit and the column constant current output array unit through the SRAM unit and the configurable register unit.
Because LED lamp pearl is to the promotion of current precision, the required current value is less, as an improvement of this embodiment, this embodiment still sets up DAC undercurrent accurate circuit unit and PAM and PWM adjusting unit in the chip, and wherein, DAC undercurrent accurate circuit unit is used for producing the undercurrent that satisfies the LED of specification to satisfy the control to LED lamp pearl according to the corresponding current value of register configuration, PAM and PWM adjusting unit are used for carrying on PAM and PWM adjustment. With reference to fig. 1 and fig. 2, the chip of this embodiment includes a current reference unit, an image parameter writing unit, a DAC low current precision circuit unit, a PAM and PWM adjusting unit, an SRAM unit, a configurable register unit, and a constant current output array unit; and the input signal is sent to the current reference unit and the image parameter writing unit, passes through the DAC low-current precision circuit unit, the PAM and PWM adjusting unit, the SRAM unit and the configurable register unit, and is output in the constant-current output array unit.
The DAC low-current accurate circuit unit comprises a plurality of NMOS tubes which are connected in parallel, the grids of the NMOS tubes are connected with input signals through switches, the drains of the NMOS tubes are connected with input voltage, and the sources of the NMOS tubes are grounded. The current value and the voltage value flowing through the NMOS tube are controlled by controlling the input current and the voltage, and the voltage and the current can be accurately controlled. The DAC low-current precise circuit unit improves the current capacity and the performance by adjusting the width-to-length ratio of the NMOS tube under the condition of ensuring that the current value is not changed. The ultra-high density LED requires a small current for driving, and the current accuracy during the small current driving is ensured, so that a good effect can be achieved when the gray scale is small. This embodiment is through setting up the accurate circuit unit of DAC undercurrent, and the adjustment generates different electric currents and realizes the control to LED lamp pearl grey scale.
The input signal of the image parameter writing unit comprises the information of the image and the corresponding control signal, and can complete preset functions aiming at different signals, such as: zero clearing, ghost elimination, etc., and at chip internal integration PAM and PWM adjusting unit, through PAM Pulse Amplitude Modulation and PWM Pulse width Modulation, when the frequency is higher, can realize the control of higher bit width, this embodiment is controlled from two conditions of Pulse Amplitude and Pulse width, can satisfy the signal Modulation under the low gray level, and the signal Modulation of bigger grey level, be favorable to the control that the little interval LED shows. The embodiment realizes constant current output driving by controlling current driving through the PAM and PWM adjusting unit, and is beneficial to gray scale control under high refresh rate.
Fig. 4 is a schematic connection diagram of the driving chip of this embodiment in practical application, and the chip of this embodiment can reduce interference caused by wiring and reduce the area and complexity of the PCB. As shown in fig. 4, the LED lamp beads 101 and the driving chip 102 are arranged on the front and back sides of the PCB board 100, and the front and back sides are arranged to embed the wires in the board layer of the PCB board 100, so as to avoid the interference of external wires and facilitate the arrangement of the wires. LED lamp pearl 101 represents single lamp pearl, and in Mini-LED and Micro-LED field, the single area of LED lamp pearl 101 is less, need reduce the clearance between the lamp pearl for display effect, if the chip is too big, when integrated, the size of two chips can't be held to LED display module to PCB board 100 need correspond the increase or increase with the interval of single LED lamp pearl 101, and is great to display effect influence. The driving chip 102 can reduce the number of chips in a row-column integration mode, so that the driving chip 102 can be placed on the back surface of the PCB 100 to complete driving in a single display module, and the LED lamp bead driving circuit has remarkable advantages of reducing the area of the PCB 100, ensuring the compactness of the LED lamp beads 101, optimizing the wiring mode and the like.
Example 2
The present embodiment discloses a method for driving the chip described in embodiment 1.
As shown in FIG. 3, for convenience of illustration, the chip of this embodiment takes 16 rows and columns as an example, i.e. the chip presets 16 rows and columns of outputs OUT [0:15] and 16 rows and columns of outputs LINE [0:15 ]. The chip comprises an input end SIN and an input end SCLK, an output end SOUT, output ends LINE [0] to LINE [15] and output ends OUT [0] to OUT [15 ]; the input signal SIN comprises an input image signal and a control signal, and the input clock signal SCLK is used for providing reference clocks inside all chips and ensuring the clocks of all clock chips to be uniform; the output signal SOUT is used for generating an image signal and a control signal after display, and the driving chips are connected in a cascade manner, that is, the output end SOUT of the first driving chip is connected with the input end SIN of the second driving chip, and so on. When the driving circuit is applied, the first chip receives an SIN signal of the external control card, removes self output content, converts the signal into an output signal, and outputs the output signal through the output end SOUT as a driving signal of the next chip.
After the first driving chip receives an input signal of an external control card, the first driving chip generates corresponding row signals LINE [0:15] and column signals OUT [0:15], the row signals LINE [0:15] of the first driving chip are connected with the 1 st to 16 th rows of the display array, the column signals OUT [0:15] of the first driving chip are connected with the 1 st to 16 th columns of the display array, the row signals LINE [0:15] of the second driving chip are connected with the 17 th to 32 th rows of the display array, and the column signals OUT [0:15] of the second driving chip are connected with the 17 th to 32 th columns of the display array, namely the first driving chip can control the 1 st to 16 th rows and the 1 st to 16 th rows of the whole display array, and the second driving chip can control the 17 th to 32 th rows and the 17 th to 32 th columns of the whole display array. The display array is divided into a plurality of display modules comprising 16 rows and 16 columns according to the number of output signals of the driving chip, namely, a 32-row and 32-column display array shown in fig. 3 comprises display modules 1-1 of 1 st to 16 th rows and 1 st to 16 th columns, display modules 1-2 of 1 st to 16 th rows and 17 th to 32 th rows, display modules 2-1 of 17 th to 32 th rows and 1 st to 16 th columns, and display modules 2-2 of 17 th to 32 th rows and 17 th to 32 th rows.
The first driving chip controls the data display of the 1 st to 16 th rows and the 1 st to 16 th columns of the whole display array, namely, the rows and the columns of the display module 1-1, the columns of the display module 2-1 and the rows of the display module 1-2 can be driven; the second driving chip controls the 17 th to 32 th rows and 17 th to 32 th columns of the whole display array to display data, namely, the rows and the columns of the display module 2-2, the columns of the display module 1-2 and the rows of the display module 2-1 can be driven. For a display array with 32 rows and 32 columns, by using the driving method of the embodiment, the embodiment uses two driving chips, i.e., controls the display modules 1-1, 1-2, 2-1, and 2-2 of the display array, and compared with the conventional method that two row chips and two column chips are needed for driving and controlling rows and columns respectively, the embodiment reduces the area of the two chips. The embodiment can achieve the same function and obtain better display effect.
Fig. 5 is a schematic diagram of an example of an overall module in use in this embodiment, in a display array module with an area of m × n, it is only necessary to set max { m, n } driving chips, that is, the maximum value of m and n, where m and n are integers greater than zero, to implement driving display of the display array module, and in a normal case, it is preferable to ensure that the number of rows m is equal to the number of columns n, that is, m = n, so as to facilitate overall driving.
In the actual driving arrangement, the driving chips 1-1 can be arranged according to diagonal lines, and are responsible for row driving of the first row module of the whole module, namely row driving of the display module 1-X, and column driving of the first column module of the whole module, namely column driving of the display module X-1, …, and so on, and the last driving chip m-n completes driving of the last row m-X and the last column X-n of the whole module. When m ≠ n, it is necessary to control the last chip to turn on only the column signal or the row signal, or to use the row driver or the column driver separately at the end, so as to avoid the additional input signal.
The invention and its embodiments have been described above schematically, without limitation, and as illustrated in the specification and drawings, the invention accomplishes the fabrication of a practical sample wafer and passes through multiple use tests, and the chip architecture is verified to achieve the intended purpose and effect through multiple test tests, and its practical performance and efficacy are needless to say. The above embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are modified or modified by the content of the present invention or directly or indirectly applied to other related technical fields are encompassed by the present invention.
Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (10)
1. A high integrated LED display driver chip of ranks, characterized by, drive the integration in the chip of line and column driver;
the chip comprises a current reference unit, an image parameter writing unit, an SRAM unit, a configurable register unit, a row switch output array unit and a column constant current output array unit; and the input signal is sent to the current reference unit and the image parameter writing unit, passes through the SRAM unit and the configurable register unit, and is output under the control of the row switch output array unit and the column constant current output array unit.
2. A row-column highly integrated LED display driver chip as claimed in claim 1, wherein said chip comprises an input terminal SIN for connecting input image signals and control signals, an input terminal SCLK for connecting input clock signals, an output terminal SOUT for connecting input terminals of the next chip, and an output terminal OUT for connecting column signals in the display array and an output terminal LINE for connecting row signals in the display array.
3. A row-column highly integrated LED display driver chip according to claim 1, wherein said chip comprises DAC small current precision circuit unit for generating DAC small current and completing DAC small current precision copy.
4. The row-column highly integrated LED display driver chip as claimed in claim 1 or 3, wherein the chip comprises PAM and PWM adjusting unit for PAM and PWM adjustment.
5. A display module comprising the LED display driving chip with high integration of rows and columns as claimed in any one of claims 1 to 4, wherein the LED lamp beads and the driving chip are respectively arranged on the front and back sides of the PCB.
6. A chip driving method is characterized in that a plurality of LED display driving chips with high integration of rows and columns as claimed in claims 1 to 4 are cascaded to realize the driving display of a display array.
7. A method according to claim 6, wherein max { m, n } driver chips are provided for a display array having an area m x n, i.e. the maximum of m and n, m and n being integers greater than zero.
8. The method of claim 7, wherein the corresponding rows and columns of the display array are driven according to the number x of row signal outputs and the number x of column signal outputs of the driver chips, i.e. the first driver chip drives the 1 st row to the x-th row and the 1 st column to the x-th column of the display array, the second driver chip drives the x +1 st row to the 2 x-th row and the x +1 st column to the 2 x-th column of the display array, …, and so on.
9. The chip driving method as claimed in claim 6, wherein m and n have the same value.
10. The chip driving method as claimed in claim 6, wherein m is different from n, and for the chips with different numbers of m and n, the control is to turn on only the column/row signals or to use the column/row driving alone.
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| CN202210042636.7A CN114360450A (en) | 2022-01-14 | 2022-01-14 | Line and row high-integration LED display driving chip and application |
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| CN202210042636.7A CN114360450A (en) | 2022-01-14 | 2022-01-14 | Line and row high-integration LED display driving chip and application |
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