Display driving chip and display device

Abstract

The invention relates to a display driving chip and a display device, and the chip comprises a groups of channel current output modules, each group of channel current output module comprises at least one current unit, and each current unit is used for outputting a driving current; each group of channel control modules comprises at least one PWM (Pulse Width Modulation) generation unit, each group of channel control modules is used for generating PWM signals corresponding to the same color, and the PWM signal generated by one PWM generation unit is used for controlling the output duration of the driving current output by one current unit corresponding to the PWM generation unit; and the selection module is used for controlling colors corresponding to the PWM signals received by each group of channel current output modules according to the acquired selection signals. The problem of color cast caused by large difference of total driving current of different display driving chips can be solved, and the sub-pixel color corresponding to the output driving current can be adjusted, so that the problem that residual channels possibly exist due to inflexible output of the driving circuit is solved.

Description

Technical Field

[0001] The present application relates to the display field, and in particular to a display driver chip and a display device. Background Art

[0002] Figure 1 It is an exemplary LED (light emitting diode) display screen array structure, which is a common anode structure, that is, the anodes of the three RGB (red, green and blue) lamp beads are connected together, and the cathodes are separated. Figure 1 For the sake of simplicity, only one color of lamp beads is drawn. Figure 1 All LED lamp beads are connected in reverse. Figure 1 The row driver usually uses PMOS tubes (P-channel metal oxide semiconductor field effect transistors), and the column driver usually uses constant current source driver chips. For example, each constant current source driver chip will include multiple constant current output drive channels (OUT), and the constant current output drive channel (OUT) is terminated Figure 1 The column lines in (1st column / 2nd column... / nth column).

[0003] Figure 1 The structure shown works as follows:

[0004] 1. First display row 1. The PMOS of row 1 is turned on, the PMOS of other rows are turned off, the row line of row 1 is connected to the power supply, and the row lines of other rows are high impedance.

[0005] 2. Column drive (constant current source drive) outputs constant current source correspondingly by column according to the display data of the first row, lights up the LED display beads in the first row, and displays the display image of the first row.

[0006] 3. Repeat steps 1 and 2 for each line until all lines are displayed.

[0007] An exemplary solution is to connect all output channels of a constant current source driver chip to the same color of lamp beads. In order to configure the white balance of the display screen, the driving currents of the red, green and blue lamp beads are usually different, with the red current being the largest. This causes the total current flowing through the constant current source driver chip connected to the red lamp bead to be greater than that of the other two colors. After a long working time, the temperature near the chip is locally high, which leads to color cast.

[0008] The existing driver chips that support driving RGB three-color lamp beads often have fixed colors corresponding to each channel and cannot be flexibly adjusted. For example, OUT0 always corresponds to red, and OUT1 always corresponds to green. On the one hand, this leads to inflexible wiring of the display system. On the other hand, most of the existing technologies connect three consecutive channels (such as OUT0-OUT2) of the same driver chip to the red, green and blue sub-pixels of the same pixel, resulting in excess channels when the number of driver chip channels is not a multiple of 3. Summary of the invention

[0009] Based on this, it is necessary to provide a display driver chip and a display device that can solve the problem of color cast and the problem of remaining channels caused by the color corresponding to the output channel of the driver chip being unadjustable.

[0010] A display driver chip comprises: a group of channel current output modules, each group of channel current output modules comprises at least one current unit, each current unit is used to output a driving current, and each group of channel current output modules is used to output a driving current corresponding to the same color; a is an integer greater than 1; a group of channel control modules, each group of channel control modules comprises at least one PWM generation unit, each group of channel control modules is used to generate a PWM signal corresponding to the same color, and the PWM signal generated by a PWM generation unit is used to control the output duration of the driving current output by a current unit corresponding to it; a selection module is used to control the color corresponding to the PWM signal received by each group of channel current output modules according to the obtained selection signal, so that each group of channel current output modules outputs the driving current of the corresponding color during the effective period of the received PWM signal.

[0011] The above-mentioned display driver chip includes multiple groups of channel current output modules, one group of channel current output modules is used to output the driving current of sub-pixels of one color, so the display driver chip can output the driving current of sub-pixels of various colors. Compared with the solution that a display driver chip only outputs the driving current of sub-pixels of one color, the total driving current of different display driver chips in this application is similar, so it can solve the color cast problem caused by the large difference in the total driving current of different display driver chips. By selecting the signal to control which sub-pixel color the PWM signal received by each group of channel current output modules corresponds to, it is possible to adjust the sub-pixel color corresponding to the driving current output by the output channel, and the circuit design is more flexible.

[0012] In one embodiment, the selection module is connected between the channel current output module and the channel control module, and the selection module is used to select, according to the selection signal, to which group of channel current output modules the PWM signals generated by each group of channel control modules are output.

[0013] In one embodiment, the display driver chip further includes a group of registers, the group of registers is used to output first control signals corresponding to a colors, and each group of channel control modules is used to receive a first control signal of a color.

[0014] In one embodiment, the selection module is connected between each group of channel control modules and each group of registers, and the selection module is used to select the first control signal corresponding to the color received by each group of channel control modules according to the selection signal, so as to control the color corresponding to the PWM signal generated by each group of channel control modules.

[0015] In one embodiment, the selection module is connected to the a group of registers, and the selection module is used to configure the color corresponding to each group of registers according to the selection signal.

[0016] In one embodiment, the display driver chip further includes a reference current generating module, which is connected to each group of the channel current output modules and is used to generate a reference current and output it to each group of the channel current output modules.

[0017] In one embodiment, the ratio of the current value output by each current unit during the effective period of the PWM signal to the current value of the reference current is a preset value, and the current units of the same group of channel current output modules have the same preset value.

[0018] In one of the embodiments, the display driver chip further includes a memory, wherein the memory is used to receive and store image data from outside the display driver chip; each of the PWM generation units is configured to generate a PWM signal of a corresponding pulse width according to the image data.

[0019] In one embodiment, each group of channel control modules is further used to generate a second control signal corresponding to the same color; the second control signal is a cancellation control signal and / or a decoupling control signal of a channel current output module corresponding to the channel control module.

[0020] In one embodiment, the reference current generating module includes: a bandgap reference circuit, used to generate a reference voltage; a bias unit, connected to the bandgap reference circuit, and used to generate a bias current according to the reference voltage; and a current generating unit, connected to the bandgap reference circuit, the bias unit and each of the channel current output modules, and used to generate the reference current according to the reference voltage and the bias current.

[0021] In one of the embodiments, the current generating unit is grounded via an off-chip resistor.

[0022] A display device comprises a plurality of driver chips and a plurality of pixels arranged in an array, wherein each of the driver chips is connected to the pixel array, and each of the driver chips is a display driver chip according to any of the aforementioned embodiments.

[0023] In the above-mentioned display device, the display driver chip includes multiple groups of channel current output modules, one group of channel current output modules is used to output the driving current of sub-pixels of one color, so the display driver chip can output the driving current of sub-pixels of various colors. Compared with the solution that a display driver chip only outputs the driving current of sub-pixels of one color, the total driving current of different display driver chips in this application is similar, so it can solve the color cast problem caused by the large difference in the total driving current of different display driver chips. By selecting the signal to control which sub-pixel color the PWM signal received by each group of channel current output modules corresponds to, it is possible to adjust the sub-pixel color corresponding to the driving current output by the output channel, and the circuit design is more flexible.

[0024] In one of the embodiments, the display device is an LED display device, each pixel in the pixel array includes sub-pixels of three colors: RGB, and a=3. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to better describe and illustrate the embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more drawings. The additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the embodiments and / or examples currently described, and the best modes of these inventions currently understood.

[0026] Figure 1 It is an exemplary LED display screen array structure.

[0027] Figure 2 1 is a circuit structure diagram of a display driver chip in one embodiment of the present application.

[0028] Figure 3 It is a circuit structure diagram of a display driver chip in yet another embodiment of the present application.

[0029] Figure 4 It is a circuit structure diagram of a display driver chip in another embodiment of the present application.

[0030] Figure 5 It is a circuit structure diagram of a display driver chip in another embodiment of the present application.

[0031] Figure 6 is a circuit structure diagram of a reference current generating module in one embodiment of the present application.

[0032] Figure 7It is a circuit structure diagram of a display driver chip in another embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] It should be understood that when an element or layer is referred to as "on ...," "adjacent to ...," "connected to" or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...," "directly adjacent to ...," "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as the second element, component, region, layer or part.

[0036] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used here for convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, the spatial relationship terms are intended to also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, then the elements or features described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0037] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0038] The present application proposes a display driver chip, which can realize a chip outputting driving currents of a sub-pixels of different colors. The output channels of the chip are divided into a groups, and which group of output channels outputs the current of a sub-pixel of a different color can be selected through configuration.

[0039] Figure 2 is a circuit structure diagram of a display driver chip in an embodiment of the present application, including a group of channel current output modules 130 (a is the number of sub-pixel colors of the display device adapted by the display driver chip, a>1, in Figure 2 In the embodiment shown, a=3), a group of channel control modules 120 and selection modules 110. Each group of channel current output modules 130 includes at least one current unit, each current unit is connected to an output channel ( Figure 2 Each group of channel current output modules 130 is used to output the sub-pixel driving current corresponding to the same color to the corresponding output channel. Each group of channel control modules 120 includes at least one PWM generation unit, and each group of channel control modules 120 is used to generate a PWM signal corresponding to the same sub-pixel color. The PWM signal generated by a PWM generation unit is used to control the output duration of the driving current output by a current unit corresponding to it. The selection module 110 is used to control the color corresponding to the PWM signal received by each group of channel current output modules 130 according to the obtained selection signal, so that each group of channel current output modules 130 outputs the driving current of the corresponding color sub-pixel during the effective period of the received PWM signal.

[0040] exist Figure 2 In the illustrated embodiment, the selection module 110 is connected to each group of channel control modules 120 , but in fact the selection module 110 may be connected to other positions in the circuit, which will be described in detail later in the present application.

[0041] Here, when each group of channel control modules 120 includes multiple PWM generation units, for example, N PWM generation units, each group of channel control modules 120 will output N PWM signals, and the pulse width of each PWM signal is related to the grayscale data. Each group of channel current output modules 130 has N current units, and the N PWM signals of the channel control modules 120 corresponding to a group of channel current output modules 130 will be used to control the duration of the N current units outputting constant currents.

[0042] The above-mentioned display driver chip includes multiple groups of channel current output modules 130, and one group of channel current output modules 130 is used to output the driving current of a sub-pixel of one color. Therefore, the display driver chip can output the driving current of sub-pixels of various colors. Compared with the solution that a display driver chip only outputs the driving current of a sub-pixel of one color, the total driving current of different display driver chips in this application is similar, so it can solve the color cast problem caused by the large difference in the total driving current of different display driver chips. By selecting the signal to control which sub-pixel color the PWM signal received by each group of channel current output modules 130 corresponds to, it is possible to adjust the sub-pixel color corresponding to the driving current output by the output channel, and the circuit design is more flexible.

[0043] In one embodiment of the present application, each group of channel control modules 120 is also used to generate a second control signal corresponding to the same color; the second control signal is a shadow elimination control signal and / or a decoupling control signal of the channel current output module corresponding to the group of channel control modules.

[0044] That is to say, each group of channel control modules 120 is also used to generate a second control signal, such as a blanking and / or decoupling related control signal, such as a blanking time length control signal, a decoupling time length control signal, a level amplitude control signal, etc.

[0045] It should be noted that the channel current output module 130 includes not only a current unit for outputting a constant current to light up the lamp beads, but also a pre-charging module for charging and discharging the row lines and / or column lines according to the timing to achieve shadow elimination and decoupling. The pre-charging module is controlled by the aforementioned shadow elimination and decoupling and other related control signals.

[0046] In one embodiment of the present application, Figure 3 The selection module 110 is connected to the channel current output module 130 and the channel control module 120. The selection module 110 is used to select which group of channel current output modules 130 the PWM signals generated by each group of channel control modules 120 are output to according to the selection signal.

[0047] In one embodiment of the present application, the display driver chip further includes a group of registers 140, and the group of registers 140 is used to output a first control signal corresponding to a color - that is, each group of registers 140 outputs a first control signal corresponding to a color, and each group of channel control modules 120 is used to receive a first control signal of a color, such as Figure 3 In this embodiment, a=3, and the registers 140 include a group of red registers, a group of green registers, and a group of blue registers, each of which outputs a red control signal, a green control signal, and a blue control signal to a group of channel control modules 120 .

[0048] In this embodiment, each group of registers 140 corresponds to a fixed color, and the channel control modules connected to each group of registers 140 in a one-to-one correspondence also correspond to a fixed color. Figure 3 , the first group of registers 140 corresponds to red, the second group of registers 140 corresponds to green, the third group of registers 140 corresponds to blue, the channel control module 120 corresponding to the first group of registers 140 corresponds to red (outputs PWM signals and control signals corresponding to red), the channel control module 120 corresponding to the second group of registers 140 corresponds to green, and the channel control module 120 corresponding to the third group of registers 140 corresponds to blue. According to the selection signal, it can be selected which group of channel control modules 120 corresponds to which group of channel current output modules 130, that is, which group of channel control modules 120 sends PWM signals and / or control signals to which group of channel current output modules 130.

[0049] In some embodiments of the present application, the display driver chip further includes a reference current generating module 150. The reference current generating module 150 is connected to each group of channel current output modules 130, and is used to generate a reference current and output it to each group of channel current output modules 130. Figure 3 .

[0050] It should be noted that in the present application, the first control signal (such as green control signal, red control signal, blue control signal) output by each register 140 is a register-type control signal. After the corresponding channel control module 120 receives such a signal, it will generate a PWM signal corresponding to each color and the aforementioned shadow cancellation, decoupling and other related control signals, and such shadow cancellation, decoupling and other related control signals are timing waveform signals.

[0051] Figure 41 is a circuit structure diagram of a display driver chip in another embodiment of the present application. In this embodiment, the selection module 110 is connected between each group of channel control modules 120 and each group of registers 140. The selection module 110 selects the first control signal corresponding to the color received by each group of channel control modules 120 according to the selection signal, so as to control the color and / or control signal (such as the relevant control signal such as the shadow elimination decoupling) corresponding to the PWM signal generated by each group of channel control modules 120.

[0052] In this embodiment, the three groups of registers 140 correspond to fixed colors. For example, the first group of registers 140 corresponds to red, the second group of registers 140 corresponds to green, and the third group of registers 140 corresponds to blue. Each group of registers 140 outputs a corresponding first control signal. The selection module 110 outputs the corresponding color signal to the corresponding channel control module according to the selection signal, for example, outputs the red control signal to Figure 4 The second channel control module 120 from left to right in the figure outputs the green control signal to the leftmost channel control module 120 and outputs the blue control signal to the right channel control module 120.

[0053] After receiving the first control signal and grayscale data, each channel control module 120 will generate a PWM signal and a control signal (such as shadow elimination, decoupling and other related control signals) of the corresponding color. A group of channel control modules 120 and a group of channel current output modules 130 correspond one to one. Once the color corresponding to each channel control module 120 is determined by the selection module 110, the color corresponding to each group of channel current output modules 130 is determined.

[0054] Figure 5 1 is a circuit diagram of a display driver chip in another embodiment of the present application. In this embodiment, the selection module 110 and the group a register 140 ( Figure 5 In the embodiment shown, a=3) connection, the selection module 110 configures the color corresponding to each group of registers 140 according to the selection signal.

[0055] With the aforementioned Figure 3-Figure 4 In the implementation method of the embodiment, the colors corresponding to each group of registers 140 are fixed to be different. Figure 5 In the embodiment shown, the colors corresponding to the registers 140 are not fixed. The selection module 110 determines which colors correspond to the registers 140 according to the selection signal. Once the colors of the registers 140 are determined, the colors corresponding to the channel control modules 120 and the channel current output modules 130 corresponding to the registers 140 can be determined.

[0056] Figure 61 is a circuit structure diagram of a reference current generating module 150 in an embodiment of the present application. In this embodiment, the reference current generating module 150 includes a bandgap reference circuit 152, a bias unit 154 and a current generating unit 156. The bandgap reference circuit 152 is used to generate a reference voltage. The bias unit 154 is connected to the bandgap reference circuit 152, and the bias unit 154 is used to generate a bias current according to the reference voltage. The current generating unit 156 is connected to the bandgap reference circuit 152, the bias unit 154 and each channel current output module 130, and is used to generate a reference current according to the reference voltage and the bias current, and output it to each group of channel current output modules 130.

[0057] exist Figure 6 In the illustrated embodiment, the current generating unit 156 is connected to ground via an external resistor R_EXT.

[0058] In one embodiment of the present application, the ratio of the current value output by each current unit during the effective period of the received PWM signal to the current value of the reference current is a preset value, and the current units of the same group of channel current output modules 130 have the same preset value. Further, each current unit and the current generating unit 156 form a current mirror, and the aforementioned preset value is determined by the size of the MOS tube (metal oxide semiconductor field effect tube) in each current unit.

[0059] In one embodiment of the present application, the display driver chip further includes a memory 160. The memory 160 receives and stores image data from outside the display driver chip. Each PWM generation unit is configured to generate a PWM signal of a corresponding pulse width according to the image data.

[0060] Figure 7 1 is a circuit diagram of a display driver chip in another embodiment of the present application. In this embodiment, the display driver chip 100 includes a selection module 110, three groups of channel control modules 120, three groups of channel current output modules 130, three groups of registers 140, a bandgap reference circuit 152, a bias unit 154, a current generating unit 156 and a memory 160 and a plurality of output channels ( Figure 7 Each group of channel current output modules includes at least one current unit, and each group of channel control modules includes at least one PWM generation unit.

[0061] The register 140 receives the control instructions transmitted from the outside of the display driver chip, and generates the red control signal required for image display to the red channel control module, the green control signal to the green channel control module, and the blue control signal to the blue channel control module. The memory 160 receives the image data information transmitted from the outside of the chip, and outputs it to each channel control module 120. The channel control module 120 generates a PWM signal of corresponding pulse width (including PWM signals of three color sub-pixels of red, green and blue), as well as related control signals such as shadow elimination and decoupling according to the size of the image data to be displayed. The PWM signal and the related control signals such as shadow elimination and decoupling are selected by the selection module 110, and the selection signal controls the selection module 110 to output the PWM signal and the related control signals such as shadow elimination and decoupling to the corresponding channel current output module 130, that is, which PWM signal each current unit receives is controlled by the selection signal, and which related control signals such as shadow elimination and decoupling each pre-charging module receives are also controlled by the selection signal. The bandgap reference circuit 152 generates a reference voltage and outputs it to the bias unit 154 and the current generating unit 156. The bias unit 154 generates a bias current according to the reference voltage and outputs it to the current generating unit 156. The current generating unit 156 is grounded through an external resistor R_EXT, and generates an accurate reference current using the reference voltage and the bias current, and outputs it to each current unit. Each current unit outputs a driving current whose ratio to the current value is a preset value to the corresponding output channel according to the reference current and the PWM signal.

[0062] In one embodiment of the present application, there are 18 output channels in total. Output channels 1, 4, 7, 10, 13, and 16 are the first group, output channels 2, 5, 8, 11, 14, and 17 are the second group, and output channels 3, 6, 9, 12, 15, and 18 are the third group. The selection signal includes a color selection signal. When the color selection signal is 0, the PWM signal and control signal output by the red channel control module are given to the first group of channel current output modules 130, and the first group of output channels outputs the driving current corresponding to the red sub-pixel; the PWM signal and control signal output by the green channel control module are given to the second group of channel current output modules 130, and the second group of output channels outputs the driving current corresponding to the green sub-pixel; the PWM signal and control signal output by the blue channel control module are given to the third group of channel current output modules 130, and the third group of output channels outputs the driving current corresponding to the blue sub-pixel. Then the output order of the output channels from 1 to 18 is red, green, blue, red, green, and blue... When the color selection signal is 1, the PWM signal and control signal output by the red channel control module are given to the second channel current output module 130, and the second output channel outputs the driving current corresponding to the red sub-pixel; the PWM signal and control signal output by the green channel control module are given to the third channel current output module 130, and the third output channel outputs the driving current corresponding to the green sub-pixel; the PWM signal and control signal output by the blue channel control module are given to the first channel current output module 130, and the first output channel outputs the driving current corresponding to the blue sub-pixel. Then the output order of the output channels from 1 to 18 is blue, red, green, blue, red, green, etc. When the color selection signal is 2, the PWM signal and control signal output by the red channel control module are given to the third channel current output module 130, and the third output channel outputs the driving current corresponding to the red sub-pixel; the PWM signal and control signal output by the green channel control module are given to the first channel current output module 130, and the first output channel outputs the driving current corresponding to the green sub-pixel; the PWM signal and control signal output by the blue channel control module are given to the second channel current output module 130, and the second output channel outputs the driving current corresponding to the blue sub-pixel. Then the output order of the output channels from 1 to 18 is green, blue, red, green, blue, red, etc.

[0063] Since each group of channel current output modules 130 can be controlled to output corresponding driving currents of different colors, for example, the output channels of driver chip 1 output in the order of red, green, blue, red, green, blue from 1-18..., the output channels of driver chip 2 output in the order of green, blue, red, green, blue, red from 1-18..., the output channels of driver chip 3 output in the order of blue, red, green, blue, red, green from 1-18... Therefore, the above-mentioned driver chip 1, driver chip 2, and driver chip 3 can be taken as a group, and the same output channel of each driver chip is connected to the red, green, and blue sub-pixels of the same pixel. In this way, the problem of redundant output channels can be avoided.

[0064] The above display driver chip can realize the generation of three constant current outputs of RGB, and the order of RGB output by the output channel can be adjusted by the selection signal. In one embodiment of the present application, the display driver chip is an LED constant current driver chip.

[0065] The present application accordingly provides a display device, including a plurality of driver chips and a plurality of pixels arranged in an array, each driver chip is connected to the pixel array, and each driver chip is a display driver chip described in any of the aforementioned embodiments. In one embodiment of the present application, the display device is an LED display device, and each pixel in the pixel array includes sub-pixels of three colors of RGB, and a=3.

[0066] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A display driver chip, characterized in that: include: a group of channel current output modules, each group of channel current output modules includes at least one current unit, each current unit is used to output a driving current, and each group of channel current output modules is used to output a driving current corresponding to the same color; a is an integer greater than 1; a group of channel control modules, each group of channel control modules includes at least one PWM generation unit, each group of channel control modules is used to generate a PWM signal corresponding to the same color, and the PWM signal generated by a PWM generation unit is used to control the output duration of the driving current output by a current unit corresponding thereto; The selection module is used to control the color corresponding to the PWM signal received by each group of channel current output modules according to the obtained selection signal, so that each group of channel current output modules outputs a driving current of the corresponding color during the effective period of the received PWM signal.

2. The display driver chip according to claim 1, characterized in that: The selection module is connected between the channel current output module and the channel control module, and is used for selecting, according to the selection signal, to which group of channel current output modules the PWM signals generated by each group of channel control modules are output.

3. The display driver chip according to claim 1, characterized in that: It also includes a group of registers, which are used to output first control signals corresponding to a colors, and each group of channel control modules is used to receive a first control signal of one color.

4. The display driver chip according to claim 3, characterized in that: The selection module is connected between each group of channel control modules and each group of registers, and is used to select the first control signal corresponding to the color received by each group of channel control modules according to the selection signal, so as to control the color corresponding to the PWM signal generated by each group of channel control modules.

5. The display driver chip according to claim 3, characterized in that: The selection module is connected to the a group of registers, and is used to configure the color corresponding to each group of registers according to the selection signal.

6. The display driver chip according to claim 1, characterized in that: It also includes a reference current generating module, which is connected to each group of the channel current output modules and is used to generate a reference current and output it to each group of the channel current output modules.

7. The display driver chip according to claim 6, characterized in that: The ratio of the current value output by each current unit during the effective period of the PWM signal to the current value of the reference current is a preset value, and the current units of the same group of channel current output modules have the same preset value.

8. The display driver chip according to claim 1, characterized in that: It also includes a memory, which is used to receive and store image data from outside the display driver chip; each of the PWM generation units is configured to generate a PWM signal with a corresponding pulse width according to the image data.

9. The display driver chip according to any one of claims 1 to 8, characterized in that: Each group of channel control modules is also used to generate a second control signal corresponding to the same color; the second control signal is a shadow elimination control signal and / or a decoupling control signal of a channel current output module corresponding to the channel control module.

10. A display device, comprising a plurality of driver chips and a plurality of pixels arranged in an array, wherein each of the driver chips is connected to the pixel array, characterized in that: Each of the driver chips is a display driver chip according to any one of claims 1-9.

Images