CN217239023U - Current regulating circuit, display driving chip, display panel and electronic equipment - Google Patents
Current regulating circuit, display driving chip, display panel and electronic equipment Download PDFInfo
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- CN217239023U CN217239023U CN202220159341.3U CN202220159341U CN217239023U CN 217239023 U CN217239023 U CN 217239023U CN 202220159341 U CN202220159341 U CN 202220159341U CN 217239023 U CN217239023 U CN 217239023U
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Abstract
The utility model relates to a current regulation circuit, display driver chip, display panel and electronic equipment, current regulation circuit are arranged in adjusting the first electric current that flows in the emitting diode, including voltage regulation unit and current generation unit, voltage regulation unit is used for receiving first voltage, obtains the second voltage according to first voltage and provides current generation unit; the current generation unit is used for receiving the second voltage and the second current and obtaining a first current according to the second voltage and the second current, so that the current magnitude of the first current is proportional to the current magnitude of the second current. According to the utility model discloses current regulation circuit can realize adjustting of the lighteness through the electric current size of adjusting the emitting diode both ends to make luminance after the regulation and luminance before the regulation be certain proportion, thereby can realize the luminance adjustment in a poor light of proportion when emitting diode is as the backlight.
Description
Technical Field
The utility model relates to a show the field, especially relate to a current regulation circuit, display driver chip, display panel and electronic equipment.
Background
Backlights are a form of illumination commonly used in the electronics industry for display screens. The light source of the backlight may be an incandescent bulb, an electro-optic panel, a light emitting diode, a cold cathode tube, or the like. The brightness requirements of different users for the display screen may be different, and the brightness requirements of the same user for the display screen in different scenes may also be different, so how to adjust the backlight brightness becomes a hot technical problem in the field.
Taking the led as the backlight source of the display screen as an example, one dimming method in the prior art is to control the brightness of the led by a pulse width modulation signal. However, this dimming method is not practical because it damages the eyesight of some people, and the proportional relationship between the adjusted brightness and the brightness before adjustment is not stable.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a current regulation circuit, display driver chip, display panel and electronic equipment, according to the utility model discloses current regulation circuit can realize adjustting of the lighteness through the electric current size of adjusting the emitting diode both ends to make luminance after the regulation and the luminance before the regulation be certain proportion, thereby can realize the luminance adjustment in a poor light of proportion when emitting diode is as the backlight.
According to an embodiment of the present invention, there is provided a current adjusting circuit, the circuit is used for adjusting a first current flowing in a light emitting diode, the circuit includes a voltage adjusting unit and a current generating unit, the voltage adjusting unit is used for receiving a first voltage, obtaining a second voltage according to the first voltage and providing the second voltage to the current generating unit; the current generation unit is used for receiving the second voltage and the second current, and obtaining the first current according to the second voltage and the second current, so that the current magnitude of the first current is proportional to the current magnitude of the second current.
In one possible implementation manner, the voltage adjusting unit includes a first resistor group, a second resistor group, and a first amplifier, the first resistor group is connected in parallel to the second resistor group, and the first resistor group and the second resistor group are connected between a first input terminal of the first amplifier and a ground line; the first input end of the first amplifier is also connected with the ground wire through a first grounding resistor and connected with the output end of the first amplifier through a feedback resistor, and the second input end of the first amplifier receives the first voltage.
In a possible implementation manner, in the voltage adjustment unit, the first resistor group includes N resistor modules, each resistor module includes a resistor and a switch connected in series, the switch is configured to control a resistance of the first resistor group by turning off and turning on the switch, and N is a positive integer; the second resistor group comprises M resistor modules, each resistor module comprises a resistor and a switch which are connected in series, the switches are used for controlling the resistance value of the second resistor group through the turn-off and turn-on of the switches, and M is a positive integer.
In a possible implementation manner, in the second resistor group, the resistances of the resistors included in the M resistor modules are all equal to the first resistance; in the first resistor group, the resistance value of the resistor included in the nth resistor module is equal to 2 of the first resistance value n N is more than or equal to 1 and less than or equal to N and is an integer.
In a possible implementation manner, the voltage adjustment unit is further configured to receive a first control signal and a second control signal, where the first control signal includes an N-bit binary code, when the N-bit binary code is 0, the switch in the nth resistance module is turned off, when the N-bit binary code is 1, the switch in the nth resistance module in the first resistance group is turned on, and N is greater than or equal to 1 and less than or equal to N and is an integer; the second control signal comprises M +1 types, when the second control signal is the M type, the switches of M resistance modules in the M resistance modules in the second resistance group are switched on, the switches of the other resistance modules are switched off, and M is greater than or equal to 0 and less than or equal to M and is an integer.
In a possible implementation manner, the current generating unit includes a second amplifier and a first field effect transistor, a first input end of the second amplifier receives the second voltage, a second input end of the second amplifier is connected to a first pole of the first field effect transistor, an output end of the second amplifier is connected to a second pole of the first field effect transistor, a third pole of the first field effect transistor receives the second current, a second input end of the second amplifier and a first pole of the first field effect transistor are connected to a ground through a second ground resistor, and a current flowing through the second ground resistor is the first current.
In one possible implementation manner, the current regulation circuit is applied to a display driving chip.
According to another embodiment of the present invention, there is provided a display driver chip, including the current regulation circuit described above, and a control circuit, wherein the control circuit is connected to the voltage regulation unit through a signal line, and the control circuit is configured to output the first control signal and the second control signal.
According to another embodiment of the present invention, there is provided a display panel, which includes the display driver chip described above.
In a possible implementation manner, the display panel is one of a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, and an organic light emitting diode display panel.
According to another embodiment of the present invention, there is provided an electronic apparatus including the display panel described above.
In one possible implementation, the electronic device includes a display, a smartphone, or a portable device.
According to the utility model discloses current regulation circuit obtains the second voltage according to first voltage regulation earlier through the voltage control unit, and reuse current generation unit obtains first electric current according to second voltage and second electric current, and first electric current is the electric current that flows among the emitting diode, consequently can realize emitting diode's adjustting of the lighteness through the mode of adjusting the electric current at emitting diode both ends. The current of the first current is proportional to the current of the second current, so that the brightness of the light-emitting diode is also proportional to the brightness before adjustment, and when the light-emitting diode is used as a backlight source, backlight brightness adjustment in a certain proportion can be realized.
Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present invention and, together with the description, serve to explain the principles of the invention.
Fig. 1 illustrates an exemplary application scenario according to an embodiment of the present invention.
Fig. 2 shows an exemplary structure diagram of a current regulation circuit according to an embodiment of the present invention.
Fig. 3 shows an exemplary structural schematic diagram of the voltage regulating unit 10 according to the embodiment of the present invention.
Fig. 4 shows an exemplary structural schematic diagram of the first resistor group RS1 and the second resistor group RS2 according to an embodiment of the present invention.
Fig. 5 shows an exemplary structural schematic diagram of the voltage regulating unit 10 according to the embodiment of the present invention.
Fig. 6 shows an exemplary structure diagram of the current generation unit 20 according to the embodiment of the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present invention.
Fig. 1 illustrates an exemplary application scenario according to an embodiment of the present invention.
As shown in fig. 1, in an application scenario, the current adjusting circuit in the embodiment of the present invention can be used to adjust the current at two ends of at least one light emitting diode on the OLED display panel. The current regulating circuit can generate a first current I1 according to the first voltage V1 from the driving circuit and a base current (a second current I2) and provide the first current I1 to the at least one light emitting diode to regulate the brightness of the at least one light emitting diode. Wherein, the basic current can be for example the electric current that the pixel grey scale value according to the image data that treat to show on the display panel confirmed, and at least one emitting diode can connect current regulation circuit respectively, perhaps connects current regulation circuit after establishing ties, the utility model discloses do not do the restriction to at least one emitting diode and current regulation circuit's connected mode.
Fig. 2 shows an exemplary structural schematic diagram of a current regulation circuit according to an embodiment of the present invention. As shown in fig. 2, the present invention provides a current regulating circuit for regulating a first current I1 flowing through a light emitting diode, the circuit including a voltage regulating unit 10 and a current generating unit 20,
the voltage regulating unit 10 is configured to receive a first voltage V1, obtain a second voltage V2 according to the first voltage V1, and provide the second voltage V2 to the current generating unit 20;
the current generating unit 20 is configured to receive the second voltage V2 and a second current I2, and obtain the first current I1 according to the second voltage V2 and the second current I2, so that a current magnitude of the first current I1 is proportional to a current magnitude of the second current I2.
According to the utility model discloses current regulation circuit obtains the second voltage according to first voltage regulation earlier through the voltage control unit, and reuse current generation unit obtains first electric current according to second voltage and second electric current, and first electric current is the electric current that flows among the emitting diode, consequently can realize emitting diode's adjustting of the lighteness through the mode of adjusting the electric current at emitting diode both ends. The current of the first current is proportional to the current of the second current, so that the brightness of the light-emitting diode is also proportional to the brightness before adjustment, and when the light-emitting diode is used as a backlight source, backlight brightness adjustment in a certain proportion can be realized.
Wherein the light emitting diodes may be arranged on a display panel, which may be implemented based on prior art, for example, refer to the examples of display panels in the above and related description of fig. 1. The embodiment of the utility model provides a do not do the restriction to emitting diode's setting mode.
An exemplary structure of the voltage regulating unit 10 and its function in the embodiment of the present invention will be described first.
Fig. 3 shows an exemplary structural schematic diagram of the voltage regulating unit 10 according to the embodiment of the present invention.
As shown in fig. 3, in one possible implementation, the voltage regulating unit 10 includes a first resistor group RS1, a second resistor group RS2 and a first amplifier a1,
the first resistor group RS1 is connected in parallel with the second resistor group RS2, and the first resistor group RS1 and the second resistor group RS2 are connected between the first input end a1 of the first amplifier A1 and the ground line GND;
the first input terminal a1 of the first amplifier a1 is further connected to the ground GND through a first ground resistor R1, and to the output terminal A3 of the first amplifier a1 through a feedback resistor R2, and the second input terminal a2 of the first amplifier a1 receives the first voltage V1.
For example, the first resistor group RS1 may include a plurality of resistors connected in parallel, the second resistor group RS2 may also include a plurality of resistors connected in parallel, and the resistance value of the first resistor group RS1 and the resistance value of the second resistor group RS2 may be set to be adjustable. The first input a1 of the first amplifier a1 may be an inverting input of the first amplifier a1, and the second input a2 of the first amplifier a1 may be a non-inverting input of the first amplifier a 1. The power ground GND may serve as a common reference ground for the power supply zero potential. Based on the knowledge of the prior art amplifier, the voltage value of the second voltage V2 output from the output terminal a3 of the first amplifier a1 is calculated as follows:
Va2＝Va1；
(Va3-Va1)/R 2 ＝(Va1-0)/(1/(1/R 1 +1/R S2 +1/R S1 ))；
where Va1 represents a voltage value of the first input terminal a1 of the first amplifier a1 (i.e., a first voltage V1), Va2 represents a voltage value of the second input terminal a2 of the first amplifier a1, and Va3 represents a voltage value of the output terminal A3 of the first amplifier a1 (i.e., a second voltage V2). R S1 Representing the total resistance, R, of the first resistor group RS1 S2 Representing the total resistance of the second resistor set RS 2. R 1 、R 2 Respectively, the values of the first ground resistor R1 and the feedback resistor R2. From the above two equations, equation (1) can be derived:
as can be seen from equation (1), the second voltage V2 and the first voltage V1 are proportional. Total resistance R of first resistor group RS1 S1 And the total resistance value R of the second resistor group RS2 S2 In the case of adjustment, the proportional relationship between the second voltage V2 and the first voltage V1 can also be adjusted. An exemplary way of controlling the specific proportional relationship of the second voltage V2 and the first voltage V1 can be seen in the following description related to fig. 5.
In this way, it is possible to obtain a second voltage proportional to the first voltage and having a proportional relationship with the resistances of the first ground resistor, the feedback resistor, the first resistor group, and the second resistor group.
The following describes exemplary structures and functions of the first resistor group RS1 and the second resistor group RS 2.
Fig. 4 shows an exemplary structural schematic diagram of the first resistor group RS1 and the second resistor group RS2 according to an embodiment of the present invention.
In one possible implementation, as shown in fig. 4, in the voltage regulating unit 10,
the first resistor group RS1 comprises N resistor modules, each resistor module comprises a resistor and a switch which are connected in series, the switch is used for controlling the resistance value of the first resistor group RS1 through self turn-off and turn-on, and N is a positive integer;
the second resistor group RS2 comprises M resistor modules, each resistor module comprises a resistor and a switch which are connected in series, the switch is used for controlling the resistance value of the second resistor group RS2 through self turn-off and turn-on, and M is a positive integer.
Wherein, N and M can be the same or different, the utility model discloses do not limit to the specific numerical value of N and M.
For example, as shown in fig. 4, N resistor modules in the first resistor group RS1 may be arranged in parallel, so that whether the resistance value of each resistor module in the first resistor group RS1 is associated with the total resistance value of the first resistor group RS1 may be controlled by a switch in the resistor module. For each resistance module in the first resistance group RS1, when the switch included in the resistance module is turned off, the resistance value of the resistance in the resistance module is irrelevant to the total resistance value of the first resistance group RS1, and when the switch included in the resistance module is turned on, the resistance value of the resistance in the resistance module is relevant to the total resistance value of the first resistance group RS 1.
Similarly, M resistor modules in the second resistor group RS2 may be arranged in parallel, so that whether the resistance value of each resistor module in the second resistor group RS2 is associated with the total resistance value of the second resistor group RS2 or not may be controlled by a switch in the resistor module. For each resistance module in the second resistance group RS2, when the switch included in the resistance module is turned off, the resistance value of the resistance in the resistance module is irrelevant to the total resistance value of the second resistance group RS2, and when the switch included in the resistance module is turned on, the resistance value of the resistance in the resistance module is relevant to the total resistance value of the second resistance group RS 2.
When part or all of the switches in the first resistor group RS1 or the second resistor group RS2 are turned on, the first resistor group RS1 or the second resistor group RS2 may be regarded as a plurality of resistors connected in parallel, and a total resistance value of the first resistor group RS1 or a total resistance value of the second resistor group RS2, that is, a total resistance value of the plurality of resistors connected in parallel, may be calculated based on the prior art, and will not be described herein again. Those skilled in the art should understand that the first resistor group RS1 and the second resistor group RS2 may have other structures as long as the total resistance of the first resistor group RS1 and the total resistance of the second resistor group RS2 are adjustable, and the embodiment of the present invention is not limited to the specific structures of the first resistor group RS1 and the second resistor group RS 2.
By the mode, the resistance value of the first resistance group and the resistance value of the second resistance group can be controlled, and the resistance values of the first resistance group and the second resistance group are related to the proportional relation between the second voltage and the first voltage, so that the proportional relation between the second voltage and the first voltage can be adjusted by adjusting the resistance value of the first resistance group and the resistance value of the second resistance group by controlling the switch to be switched on or switched off, and the proportional relation between the second voltage and the first voltage can be adjusted.
Fig. 5 shows an exemplary structural schematic diagram of the voltage regulating unit 10 according to the embodiment of the present invention. An example of the operation of the voltage regulating unit 10 of the present invention will be described with reference to fig. 5.
As shown in fig. 5, in one possible implementation manner, in the second resistor group RS2, the resistance values of the resistors included in the M resistor modules are all equal to the first resistance value Rt;
in the first resistor group RS1, the resistance of the resistor included in the nth resistor module is equal to 2 of the first resistance Rt n N is more than or equal to 1 and less than or equal to N and is an integer.
For example, taking M-7 as an example, as shown in fig. 5, the second resistor group RS2 may include 7 resistor modules connected in parallel. The resistance values of the resistance modules in the second resistance group RS2 may be preset to be constant values, for example, equal to the first resistance value Rt.
For example, if N is 5, as shown in fig. 5, the first resistor group RS1 may include 5 resistor modules connected in parallel. The resistance values of the resistance modules in the first resistance group RS1 may be preset to be constant values, for example, the resistance value of the resistance module included in the nth resistance module is set to be equal to 2 of the first resistance value Rt n N is more than or equal to 1 and less than or equal to N and is an integer. I.e. the first resistor group RS1The resistance value of the resistor included in 1 resistor module is equal to 2Rt, and the resistance value of the resistor included in the 2 nd resistor module in the first resistor group RS1 is equal to 2 2 Rt, … …, the resistance value of the resistance comprised by the 5 th resistance module of the first resistance group RS1 being equal to 2 5 Rt。
In one possible implementation, as shown in fig. 5, the voltage regulating unit is further configured to receive a first control signal and a second control signal,
the first control signal comprises an N-bit binary code, when the N-bit binary code is 0, a switch in the N-th resistance module is turned off, when the N-bit binary code is 1, a switch in the N-th resistance module in the first resistance group is turned on, and N is greater than or equal to 1 and less than or equal to N and is an integer;
the second control signal comprises M +1 types, when the second control signal is the M type, the switches of M resistance modules in the M resistance modules in the second resistance group are switched on, the switches of the other resistance modules are switched off, and M is greater than or equal to 0 and less than or equal to M and is an integer.
The first control signal and the second control signal respectively control the switches in the first resistor group and the second resistor group to adjust the resistance values of the first resistor group and the second resistor group, the realization mode of further realizing the adjustment of the second voltage is flexible, and the use complexity of the current adjusting circuit can be reduced.
For example, taking N-5 as an example, the N-bit binary code included in the first control signal may be { b0, b1, b2, b3, b4}, wherein the 1 st bit binary code may be b0, the 2 nd bit binary code may be b1, … …, and the N-th bit binary code may be b 4. The value of the N-bit binary code determines whether the switches S0-S4 of the N resistor modules in the first resistor group are turned on or off, i.e., the values of b0-b4 determine whether the switches S0-S4 of the 1 st resistor module-the 5 th resistor module are turned on or off, respectively. Wherein the value of b0-b4 is 0 to indicate that the switches S0-S4 are turned off, and the value of b0-b4 is 1 to indicate that the switches S0-S4 are turned on. The first control signal may be transmitted in a binary code form, and since the first control signal includes an N-bit binary code and N is 5, in this case, the first control signal may include 5-bit data.
Taking M7 as an example, the M +1 type included in the second control signal may be {0000000, 0000001, 0000011, 0000111, 0001111, 0011111, 0111111, 1111111}, for example, wherein the 0 th type may be 0000000, the 1 st type may be 0000001, … …, and the M th type may be 11111111111. The conditions that the switches K0-K6 of the 1 st to 7 th resistor modules in the second resistor group are turned on or off can be respectively represented by t0-t6, the switches K0-K6 are turned off when the values of t0-t6 are 0, and the switches K0-K6 are turned on when the values of t0-t6 are 1. For example, when the second control signal is of type 0, the values of t0-t6 may all be 0. When the second control signal is type 1, one of t0-t6 has a value of 1 and the remaining values have values of 0.
The second control signal may be transmitted in the form of a thermal code, and since the second control signal includes M +1 type and M is 7, in this case, the second control signal may include 3-bit (log) 2 Data of (7+1) ═ 3).
Further, in the example of fig. 5, the second voltage V2 may be calculated by equation (2):
R 2 、R 1 the numerical value of Rt is that the resistance of feedback resistance R2, first ground resistance R1, first resistance Rt can set up in advance according to the luminance regulation demand in a poor light to make second voltage V2 after the regulation become certain proportion with first voltage V1 before the regulation, the utility model discloses to R 2 、R 1 The specific arrangement of the numerical values of Rt and Rt is not limited.
The exemplary structure and operation of the voltage regulating unit according to the embodiment of the present invention are described above. An exemplary structure and operation of the current generation unit according to the embodiment of the present invention are described below. Fig. 6 shows an exemplary structural diagram of the current generation unit 20 according to the embodiment of the present invention.
As shown in fig. 6, in one possible implementation, the current generating unit includes a second amplifier a2, a first field effect transistor Q1,
the first input terminal a21 of the second amplifier a2 receives the second voltage V2, the second input terminal a22 of the second amplifier a2 is connected to the first pole Q1 of the first fet Q1, the output terminal a23 of the second amplifier a2 is connected to the second pole Q2 of the first fet Q1, the third pole Q3 of the first fet Q1 receives the second current I2, the second input terminal a22 of the second amplifier a2, the first pole Q1 of the first fet Q1 are connected to the ground line PGND through a second ground resistance Rsns, wherein the current flowing through the second ground resistance Rsns is the first current I1.
In this way, the first current meeting the brightness adjustment requirement can be obtained based on the second voltage, and when the first current is supplied to the light emitting diode, the brightness of the light emitting diode after adjustment can be in proportion to that before adjustment.
The first input terminal a21 of the second amplifier a2 may be an inverting input terminal of the second amplifier a2, and the second input terminal a22 of the second amplifier a2 may be a non-inverting input terminal of the second amplifier a 2.
The first fet Q1 may be an N-channel fet, the first pole Q1 of the first fet Q1 may be a source, the second pole Q2 of the first fet Q1 may be a gate, and the third pole Q3 of the first fet Q1 may be a drain.
The voltage at the first pole Q1 of the first fet Q1 may be relatively high, and if the resistance of the second ground resistor Rsns is relatively large, a significant voltage drop will occur when the resistor is grounded. If the second ground resistance Rsns is directly connected to the power ground GND, which is a common reference ground for the power zero potential, a large disturbance may be generated. Therefore, in the embodiment of the present invention, the ground line to which the first pole Q1 of the first fet Q1 is connected through the second ground resistor Rsns may be the power ground line PGND of the common reference ground line at zero potential as the current regulation circuit, so as to avoid interference with the power ground line GND.
When the first fet Q1 and the second amplifier a2 are connected as shown in fig. 6, the positive feedback input from the first pole Q1 of the first fet Q1 to the second amplifier a2 adjusts the current flowing through the second ground resistor Rsns to obtain a first current I1. Since the second voltage V2 is a voltage proportional to the first voltage V1, so that when the second voltage V1 is supplied to the inverting input terminal of the second amplifier a2, the first current obtained by the positive feedback adjustment is also proportional to the second current of the reference, when the first current flows through the light emitting diode on the display panel, it is possible to realize that the luminance of the light emitting diode after adjustment is proportional to that before adjustment.
A first set R determined by testing for a predetermined value 2 、R 1 Rt, when the values of t0-t6 are 0 and b0-b4 are 0, the proportional relation between the first current I1 and the second current I2 obtained according to the second voltage V2 and the second current I2 output by the voltage regulating unit 10 can be 100%; based on the same R 2 、R 1 Rt, such that when the values of t0-t6 are 1 and the values of b0-b4 are 1, the proportional relationship between the first current I1 and the second current I2 obtained according to the second voltage V2 and the second current I2 output by the voltage regulating unit 10 may be 400%. A second group R of constant values for a predetermined value 2 、R 1 Rt, such that when the values of t0-t6 are 0 and the values of b0-b4 are 0, the proportional relationship between the first current I1 and the second current I2 obtained according to the second voltage V2 and the second current I2 output by the voltage regulating unit 10 can be 90%; based on the same R 2 、R 1 Rt, such that when the values of t0-t6 are 1 and the values of b0-b4 are 1, the proportional relationship between the first current I1 and the second current I2 obtained according to the second voltage V2 and the second current I2 output by the voltage regulating unit 10 may be 110%.
It should be understood by those skilled in the art that the structure of the current generating unit should not be limited to the above example as long as the first current equal to a certain proportion to the second current can be obtained according to the second voltage and the second current, and the present invention is not limited to the specific structure of the current generating unit.
It should be noted that each unit in the embodiments of the present invention may be implemented by a hardware circuit.
In one possible implementation manner, the current regulating circuit is applied to a display driving chip.
Wherein, the display driving chip may include an LED driving chip. The utility model discloses do not do the restriction to the concrete type of display driver chip.
The embodiment of the utility model provides a still provide a display driver chip, including above current regulation circuit to and control circuit, control circuit passes through the signal line and connects the voltage regulation unit, control circuit is used for exporting first control signal with second control signal.
The first control signal may be in a binary code form, and the second control signal may be in a thermal code form, so that the control circuit may be respectively connected to the voltage regulating unit through two signal lines for respectively transmitting the first control signal and the second control signal. Alternatively, the control circuit may be connected to the voltage adjustment unit through a signal line, and configured to transmit the first control signal and the second control signal, and the first control signal and the second control signal may be distinguished by setting corresponding identifiers for the first control signal and the second control signal, respectively. When the control circuit is connected with the voltage regulating unit through the two signal lines, the complexity of a signal transmission mechanism of the display driving chip can be reduced. When the control circuit is connected with the voltage regulating unit through a signal line, the wiring complexity of the display driving chip can be reduced. By the method, the design mode of the display driving chip is more flexible.
The embodiment of the utility model provides a still provide a display panel, including above display driver chip.
The display panel may also be a large-screen display panel, for example, a large-sized LED display screen arranged indoors or outdoors, or a combined display screen with a larger display capability obtained by combining a plurality of display panels.
In one possible implementation, the display panel may include any one or more of an LED (Light Emitting Diode) display panel, a MiniLED (Mini Light Emitting Diode) display panel, a Micro LED (Micro Light Emitting Diode) display panel, and an OLED (Organic Light-Emitting Diode) display panel.
The embodiment of the utility model provides a still provide an electronic equipment, including above display panel.
In one possible implementation, the electronic device comprises a display, a smartphone, or a portable device.
The embodiment of the present invention provides a circuit which can be various electronic devices with display function, also called User Equipment (UE), Mobile Station (MS), Mobile Terminal (MT), etc., and is a device providing voice and/or data connectivity for users, for example, a handheld device, a vehicle-mounted device, etc. with wireless connection function. Currently, some examples of terminals are: a mobile phone (mobile phone), a tablet computer, a notebook computer, a palm top computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in remote operation (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (smart security), a wireless terminal in city (smart city), a wireless terminal in home (smart home), a wireless terminal in car networking, and the like.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A current regulating circuit for regulating a first current flowing in a light emitting diode, the circuit comprising a voltage regulating unit and a current generating unit,
the voltage regulating unit is used for receiving a first voltage, obtaining a second voltage according to the first voltage and providing the second voltage to the current generating unit;
the current generation unit is used for receiving the second voltage and the second current, and obtaining the first current according to the second voltage and the second current, so that the current magnitude of the first current is proportional to the current magnitude of the second current.
2. The circuit of claim 1, wherein the voltage regulation unit comprises a first resistor bank, a second resistor bank, and a first amplifier,
the first resistor group is connected in parallel with the second resistor group, and the first resistor group and the second resistor group are connected between the first input end of the first amplifier and the ground wire;
the first input end of the first amplifier is also connected with the ground wire through a first grounding resistor and connected with the output end of the first amplifier through a feedback resistor, and the second input end of the first amplifier receives the first voltage.
3. The circuit of claim 2, wherein, in the voltage regulation unit,
the first resistor group comprises N resistor modules, each resistor module comprises a resistor and a switch which are connected in series, the switches are used for controlling the resistance value of the first resistor group through self turn-off and turn-on, and N is a positive integer;
the second resistor group comprises M resistor modules, each resistor module comprises a resistor and a switch which are connected in series, the switches are used for controlling the resistance value of the second resistor group through the turn-off and turn-on of the switches, and M is a positive integer.
4. The circuit of claim 3,
in the second resistor group, the resistance values of the resistors included in the M resistor modules are all equal to the first resistance value;
in the first resistor group, the nth resistorThe resistance of the resistor comprised by the module is equal to 2 of said first resistance n N is more than or equal to 1 and less than or equal to N and is an integer.
5. The circuit of claim 4, wherein the voltage regulation unit is further configured to receive a first control signal and a second control signal,
the first control signal comprises an N-bit binary code, when the N-bit binary code is 0, a switch in the N-th resistance module is turned off, when the N-bit binary code is 1, a switch in the N-th resistance module in the first resistance group is turned on, and N is greater than or equal to 1 and less than or equal to N and is an integer;
the second control signal comprises M +1 types, when the second control signal is the M type, the switches of M resistance modules in the M resistance modules in the second resistance group are switched on, the switches of the other resistance modules are switched off, and M is greater than or equal to 0 and less than or equal to M and is an integer.
6. The circuit of claim 1, wherein the current generation unit comprises a second amplifier, a first field effect transistor,
the first input end of the second amplifier receives the second voltage, the second input end of the second amplifier is connected with the first pole of the first field effect transistor, the output end of the second amplifier is connected with the second pole of the first field effect transistor, the third pole of the first field effect transistor receives the second current, the second input end of the second amplifier and the first pole of the first field effect transistor are connected with the ground wire through a second grounding resistor, and the current flowing through the second grounding resistor is the first current.
7. The circuit according to any one of claims 1-6, wherein the current regulating circuit is applied to a display driver chip.
8. A display driving chip comprising the current adjusting circuit according to any one of claims 1 to 7, and a control circuit connected to the voltage adjusting unit through a signal line, the control circuit being configured to output a first control signal and a second control signal.
9. A display panel characterized in that the display panel comprises the display driver chip of claim 8.
10. The display panel of claim 9, wherein the display panel is one of a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel, and an organic light emitting diode display panel.
11. An electronic device characterized in that the electronic device comprises the display panel according to claim 9 or 10.
12. The electronic device of claim 11, wherein the electronic device comprises a display, a smartphone, or a portable device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220159341.3U CN217239023U (en) | 2022-01-20 | 2022-01-20 | Current regulating circuit, display driving chip, display panel and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220159341.3U CN217239023U (en) | 2022-01-20 | 2022-01-20 | Current regulating circuit, display driving chip, display panel and electronic equipment |
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| Publication Number | Publication Date |
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| CN217239023U true CN217239023U (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220159341.3U Active CN217239023U (en) | 2022-01-20 | 2022-01-20 | Current regulating circuit, display driving chip, display panel and electronic equipment |
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| Country | Link |
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| CN (1) | CN217239023U (en) |
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- 2022-01-20 CN CN202220159341.3U patent/CN217239023U/en active Active
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