WO2023216552A1 - 驱动控制电路和显示装置 - Google Patents
驱动控制电路和显示装置 Download PDFInfo
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- WO2023216552A1 WO2023216552A1 PCT/CN2022/133801 CN2022133801W WO2023216552A1 WO 2023216552 A1 WO2023216552 A1 WO 2023216552A1 CN 2022133801 W CN2022133801 W CN 2022133801W WO 2023216552 A1 WO2023216552 A1 WO 2023216552A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Definitions
- the present application relates to the field of liquid crystal display technology, and in particular to a drive control circuit and a display device.
- LED display devices are increasingly widely used in televisions, mobile phones and other products because of their characteristics such as thinness, energy saving, wide viewing angle, wide color gamut, and high contrast.
- the light-emitting element LED in the LED display device is a current-driven device.
- the LED emits light, and the luminous brightness is determined by the current flowing through the LED.
- the threshold voltage of the driving thin film transistor in the driving control circuit will drift, resulting in changes in the driving current of the LED, resulting in uneven luminance of each LED in the display device. Affect the display effect of the display device.
- the present application provides a drive control circuit and a display device, which are used to adjust the drive current of each light-emitting element in each drive control circuit, so that the drive current of each light-emitting element becomes consistent, thereby improving the display effect of the display device.
- a drive control circuit including: a first drive circuit, a second drive circuit, a comparison circuit and an adjustment circuit;
- the input end of the first drive circuit is electrically connected to the first power supply, and the first drive circuit is used to output a first drive current to the first light-emitting element;
- the input end of the second driving circuit is electrically connected to the second power supply, and the second driving circuit is used to output a second driving current to the second light-emitting element;
- the comparison circuit is electrically connected to the output terminal of the first driving circuit and the output terminal of the second driving circuit respectively, and the comparison circuit is used to compare the magnitude of the first driving current and the second driving current. , output the comparison result to the adjustment circuit;
- the adjustment circuit is used to adjust the current of the first power supply and/or the second power supply according to the comparison result.
- embodiments of the present application provide a display device, including a light-emitting element and the drive control circuit described in the first aspect.
- the drive control circuit and display device include a first drive circuit, a second drive circuit, a comparison circuit and an adjustment circuit; the input end of the first drive circuit is electrically connected to the first power supply, and the first drive circuit is used to Output a first driving current to the first light-emitting element; the input end of the second driving circuit is electrically connected to the second power supply, and the second driving circuit is used to output the second driving current to the second light-emitting element; the comparison circuit is connected to the first driving circuit respectively.
- the output end of the second drive circuit is electrically connected to the output end of the second drive circuit.
- the comparison circuit is used to compare the magnitude of the first drive current and the second drive current, and output the comparison result to the adjustment circuit.
- the adjustment circuit is used to adjust the first power supply according to the comparison result. and/or current from the second source.
- the comparison circuit is used to compare the magnitudes of the first driving current and the second driving current, and then the adjustment circuit is used to adjust the current of the first power supply and/or the second power supply according to the comparison result, so that the first driving current and the second driving current can be adjusted.
- the driving current is more consistent, so that the luminous brightness of each light-emitting element in the display device can be made more uniform without increasing the display panel wiring and thin film transistors of the display device, thus improving the display effect of the display device.
- Figure 1 is a schematic diagram of the connection relationship between the display panel and the driving power supply of the light-emitting element provided by the embodiment of the present application;
- Figure 2 is a schematic structural diagram of a display device provided by an embodiment of the present application.
- Figure 3 is a schematic circuit structure diagram of a drive control circuit provided by the first embodiment of the present application.
- FIG. 4 is a schematic circuit structure diagram of a drive control circuit provided by the second embodiment of the present application.
- Figure 1 is a schematic diagram of the connection relationship between a display panel and a driving power supply for a light-emitting element provided by an embodiment of the present application.
- the display device may include a display panel and a plurality of driving power supplies for the light-emitting element, wherein the display panel includes a plurality of driving power supplies for the light-emitting element.
- Each light-emitting element driving power supply can provide driving current for one or more light-emitting elements.
- embodiments of the present application provide a drive control circuit to adjust the drive current of the light-emitting elements in each drive circuit, so that the drive currents of the light-emitting elements become consistent, thereby improving the display effect of the display device.
- FIG. 2 is a schematic structural diagram of a display device provided by this application.
- the display device may include: a first power supply Vdd1, a second power supply Vdd2, a first light-emitting element, a second light-emitting element and a drive control circuit.
- the drive control circuit may include a first drive circuit 10 , a second drive circuit 20 , a comparison circuit 30 and an adjustment circuit 40 .
- the first power supply Vdd1 can provide a stable current to the first light-emitting element
- the second power supply Vdd2 can provide a stable current to the second light-emitting element
- the input terminal of the first driving circuit 10 is electrically connected to the first power supply Vdd1, and the first driving circuit 10 is used to output a first driving current to the first light-emitting element.
- the input terminal of the second driving circuit 20 is electrically connected to the second power supply Vdd2, and the second driving circuit 20 is used to output a second driving current to the second light-emitting element.
- the first driving circuit and the second driving circuit may be any two driving circuits in the display device.
- the comparison circuit 30 is electrically connected to the output terminal of the first driving circuit 10 and the output terminal of the second driving circuit 20 respectively.
- the comparison circuit 30 is used to compare the magnitude of the first driving current and the second driving current, and output the comparison result to the adjustment circuit 40 .
- the comparison circuit 30 can be implemented using a comparator. Considering that the comparator will shunt the driving current of the light-emitting element, thereby affecting the light emission of the light-emitting element, in order to reduce the impact on the driving current of the light-emitting element, the comparison circuit 30 can first pass through a high resistance value.
- the operational amplifier circuit performs galvanic isolation on the first driving circuit 10 and the second driving circuit 20 before comparison.
- the comparison circuit 30 may include a first operational amplifier circuit 31 , a second operational amplifier circuit 32 and a voltage comparator 33 .
- the input terminal of the first operational amplifier circuit 31 is electrically connected to the output terminal of the first driving circuit 10 .
- One input terminal of the second operational amplifier circuit 32 is electrically connected to the output terminal of the first operational amplifier circuit 31 , and the other input terminal of the second operational amplifier circuit 32 is electrically connected to the output terminal of the second driving circuit 20 .
- the input terminal of the voltage comparator 33 is electrically connected to the output terminal of the second operational amplifier circuit 32 , and the voltage comparator 33 is used to output the comparison result to the adjustment circuit 40 .
- the adjustment circuit 40 is used to adjust the current of the first power supply Vdd1 and/or the second power supply Vdd2 according to the comparison result.
- the same data line voltage can be provided to the first driving circuit and the second driving circuit, and then the magnitudes of the first driving current and the second driving current are compared through the comparison circuit 30, and then the comparison circuit 30 is used to compare the first driving current and the second driving current.
- the adjustment circuit 40 adjusts the current of the first power supply and/or the second power supply according to the comparison result; after the adjustment, the display device can enter the normal display stage, and the adjustment circuit 40 can be turned off at this time.
- the current adjustment stage can be a period of time after the display device is turned on. During this period, the currents of the first power supply Vdd1 and the second power supply Vdd2 can be made equal. At this time, the display screen displays a solid color picture, and the adjustment circuit 40 can adjust the first power supply Vdd1 by adjusting the first power supply Vdd2.
- the currents of the power supply Vdd1 and the second power supply Vdd2 make the driving currents of the first light-emitting element and the second light-emitting element close to the same; the normal display stage may be other time periods, and no current adjustment may be performed during the normal display stage.
- the adjustment circuit 40 can be turned off by turning off the power supply of the adjustment circuit 40; or as shown in Figure 2, the control circuit 50 can be connected between the comparison circuit 30 and the adjustment circuit 40, and the comparison circuit can be turned off through the control circuit 50. 30 and the adjustment circuit 40.
- the comparison circuit 30 and the adjustment circuit 40 can be connected through the control circuit 50; when in the normal display stage, the path between the comparison circuit 30 and the adjustment circuit 40 can be closed through the control circuit 50, so that the entire drive The control circuit is disconnected.
- the control circuit 50 can flexibly control the current adjustment timing, connect the comparison circuit 30 and the adjustment circuit 40 when the current needs to be adjusted, and turn off the comparison circuit 30 and the adjustment circuit 40 when not needed; Turning off the comparison circuit 30 and the adjustment circuit 40 can also reduce the power consumption of the entire drive control circuit; in addition, the control circuit 50 is connected between the comparison circuit 30 and the adjustment circuit 40 and can also play a role in output isolation.
- the light-emitting element can be any one of OLED, inorganic light-emitting diodes (Light Emitting Diodes, LED), quantum dot light-emitting diodes (Quantum Dot Light Emitting Diodes, QLED) and sub-millimeter light-emitting diodes (Mini Light Emitting Diodes, Mini LED);
- OLED inorganic light-emitting diodes
- QLED Quantum Dot Light Emitting Diodes
- Mini LED sub-millimeter light-emitting diodes
- both the first light-emitting element and the second light-emitting element are OLEDs.
- FIG 3 is a schematic circuit structure diagram of a drive control circuit provided by the first embodiment of the present application.
- the first drive circuit 10 may include a first switch T1, a first scan line Scan1, a first driver Thin film transistor T2 and first capacitor C1.
- the gate of the first switch T1 is electrically connected to the first scan line Scan1
- the drain of the first switch T1 is electrically connected to the output terminal of the first data line Data1
- the source of the first switch T1 is connected to the first driving film.
- the gate of transistor T2 is electrically connected.
- the drain stage of the first driving thin film transistor T2 is electrically connected to the first power supply Vdd1
- the source stage of the first driving thin film transistor T2 is electrically connected to the anode of OLED1
- the cathode of OLED1 is grounded.
- Both ends of the first capacitor C1 are electrically connected to the gate of the first driving thin film transistor T2 and the cathode of the OLED1 respectively.
- the second driving circuit 20 may include a second switching transistor T3, a second scanning line Scan2, a second driving thin film transistor T4 and a second capacitor C2.
- the gate of the second switch T3 is electrically connected to the second scan line Scan2, the drain of the second switch T3 is electrically connected to the output terminal of the second data line Data2, and the source of the second switch T3 is connected to the second driving film.
- the gate of transistor T4 is electrically connected.
- the drain stage of the second driving thin film transistor T4 is electrically connected to the second power supply Vdd2, the source stage of the second driving thin film transistor T4 is electrically connected to the anode of OLED2, and the cathode of OLED2 is grounded.
- Both ends of the second capacitor C2 are electrically connected to the gate of the second driving thin film transistor T4 and the cathode of the OLED2 respectively.
- the first operational amplifier circuit 31 may include a first operational amplifier A1, a first feedback resistor Rf1, a first resistor R1, and a second resistor R2.
- the inverting input terminal of the first operational amplifier A1 is connected to the ground through the first resistor R1, and the non-inverting input terminal of the first operational amplifier A1 is electrically connected to the output terminal of the first driving circuit 10 through the second resistor R2.
- One end of the first feedback resistor Rf1 is electrically connected to the inverting input terminal of the first operational amplifier A1, and the other end of the first feedback resistor Rf1 is electrically connected to the output terminal of the first operational amplifier A1.
- the output end of the first operational amplifier A1 is electrically connected to the second operational amplifier circuit 32. Since the resistance value of the first operational amplifier A1 is infinite relative to the resistance value of OLED1, the first operational amplifier circuit 31 can hardly affect the driving of OLED1. In the case of current, the first op amp voltage is output.
- the first op amp voltage can be calculated according to the following formula (1):
- uo1 is the first operational amplifier voltage
- ui1 is the driving voltage of OLED1.
- the second operational amplifier circuit 32 may include a second operational amplifier A2, a second feedback resistor Rf2, a third resistor R3, and a fourth resistor R4.
- the inverting input terminal of the second operational amplifier A2 is electrically connected to the output terminal of the first operational amplifier A1 through the third resistor R3, and the non-inverting input terminal of the second operational amplifier A2 is connected to the output of the second driving circuit 20 through the fourth resistor R4. terminal electrical connection.
- One end of the second feedback resistor Rf2 is electrically connected to the inverting input terminal of the second operational amplifier A2, and the other end of the second feedback resistor Rf2 is electrically connected to the output terminal of the second operational amplifier A2.
- the output terminal of the second operational amplifier A2 is electrically connected to the input terminal of the voltage comparator 33. Since the resistance value of the second operational amplifier A2 is infinite relative to the resistance value of OLED2, the second operational amplifier circuit 32 can operate without affecting the operation of OLED2. In the case of driving current, the second op amp voltage is output.
- the voltage of the second op amp can be calculated according to the following formula (2):
- uo2 is the second operational amplifier voltage
- ui2 is the driving voltage of OLED2.
- the third resistor R3 can be equal to the resistance value of the first feedback resistor Rf1, and the second feedback resistor Rf2 can be equal to the resistance value of the first resistor R1.
- formula (2) can be simplified to the following formula (3 ):
- the voltage comparator 33 is an amplifier A3. One input terminal of the voltage comparator 33 is electrically connected to the output terminal of the second operational amplifier circuit 32. The other input terminal of the voltage comparator 33 is grounded.
- the voltage comparator 33 can compare The sizes of uo2 and 0, when uo2>0 (that is, the first driving current is smaller than the second driving current), the first level signal (such as a high level signal) can be output to the control circuit 50; when uo2 ⁇ 0 In this case (that is, the first driving current is greater than the second driving current), a second level signal (such as a low level signal) may be output to the control circuit 50 .
- the control circuit 50 may be a CMOS circuit or other circuits with switching functions. In the following, this implementation will take the control circuit 50 as a CMOS circuit as an example for illustrative explanation.
- control circuit 50 may include a first MOS transistor T5, a second MOS transistor T6, a third MOS transistor T7, a fourth MOS transistor T8 and a third power supply VA.
- the gate of the first MOS transistor T5 is electrically connected to the output terminal of the voltage comparator 33, the source of the first MOS transistor T5 is electrically connected to the third power supply VA, and the drain of the first MOS transistor T5 is electrically connected to the third MOS transistor T7. The drain is electrically connected.
- the gate of the third MOS transistor T7 is electrically connected to the output terminal of the voltage comparator 33, and the source of the third MOS transistor T7 is grounded.
- the gate of the second MOS transistor T6 is connected between the drain of the first MOS transistor T5 and the drain of the third MOS transistor T7.
- the source of the second MOS transistor T6 is electrically connected to the third power supply VA.
- the drain of T6 is electrically connected to the drain of the fourth MOS transistor T8.
- the gate of the fourth MOS transistor T8 is connected between the drain of the first MOS transistor T5 and the drain of the third MOS transistor T7, and the source of the fourth MOS transistor T8 is grounded.
- the third power supply VA can provide source voltage for the first MOS transistor T5 and the second MOS transistor T6.
- the voltage provided by the third power supply VA can be a fixed voltage value, or can be adjusted according to the driving voltage of OLED1 and the driving voltage of OLED2. .
- the third power supply VA can provide the source voltage for the first MOS transistor T5 and the second MOS transistor T6 during the current adjustment stage, so that the entire drive control circuit maintains the path, and then adjusts the first drive current and the second drive current to make them It is close to the same. In the normal display stage, the entire drive control circuit is disconnected, thereby reducing the power consumption of the entire drive control circuit.
- the source voltage provided by the third power supply VA can be adjusted according to the comparison result output by the voltage comparator 33 . Specifically, when the level signal output by the voltage comparator 33 is higher than the first voltage threshold, the source voltage provided by the third power supply VA can be equal to the first voltage threshold to prevent the level signal output by the voltage comparator 33 from damaging the adjustment. Circuit; when the level signal output by the voltage comparator 33 is lower than the second voltage threshold, the source voltage provided by the third power supply VA can be equal to the second voltage threshold to prevent the level signal output by the voltage comparator 33 from being unable to drive. Adjustment circuit, wherein the first voltage threshold is greater than the second voltage threshold.
- the first MOS transistor T5 and the second MOS transistor T6 may be PMOS transistors, and the third MOS transistor T7 and the fourth MOS transistor T8 may be NMOS transistors.
- the control circuit 50 can output an amplified high level signal; when the voltage comparator 33 outputs a low level, The first MOS transistor T5 and the fourth MOS transistor T8 can be in a conductive state, and the control circuit 50 can output an amplified low-level signal, thereby making it easier for the adjustment circuit 40 to distinguish the high and low level signals received.
- the input terminal of the adjustment circuit 40 is connected between the drain of the second MOS transistor T6 and the drain of the fourth MOS transistor T8.
- a first level signal such as a high level signal
- the adjustment circuit 40 can increase the current of the first power supply Vdd1, and/or reduce the current of the second power supply Vdd2
- a second level signal such as a low level signal
- the adjustment circuit 40 can reduce the current of the first power supply Vdd1, and/or increase the current of the second power supply Vdd2, so that the first driving current and the second The driving current tends to be consistent.
- the adjustment circuit 40 can adjust the currents of the first power supply Vdd1 and/or the second power supply Vdd2 multiple times during the time the control circuit 50 is on, so that the first driving current and the second driving current are more consistent.
- the display device provided in this embodiment may also include multiple drive control circuits. These drive control circuits can respectively adjust the drive currents of the target OLED and other OLEDs, so that the drive currents of other OLEDs are consistent with the drive current of the target OLED. The current tends to be consistent, and the target OLED can be any OLED in the display device.
- the display device can include three of the above drive control circuits. These three drive control circuits are respectively used. It is used to adjust the driving current of OLED2, OLED3 and OLED4 so that the driving current of OLED2, OLED3 and OLED4 finally approaches the driving current of OLED1. This can make the luminous brightness of each OLED in the display device more uniform, thus improving the display device. display effect.
- the first light-emitting element and the second light-emitting element are Mini LEDs, wherein each of the first light-emitting element and the second light-emitting element can include multiple, each first light-emitting element is connected in series, and each second light-emitting element is connected in series.
- the light-emitting elements are connected in series.
- Figure 4 is a schematic circuit structure diagram of the drive control circuit provided by the second embodiment of the present application.
- the first light-emitting element includes Mini LED1 and Mini LED2 connected in series
- the second light-emitting element includes Mini LED1 and Mini LED2 connected in series.
- Mini LED1 The input terminal of Mini LED1 is electrically connected to the source level of T2, the output terminal of Mini LED1 is electrically connected to the input terminal of Mini LED2, and the output terminal of Mini LED2 is grounded.
- Mini LED3 The input terminal of Mini LED3 is electrically connected to the source stage of T4, the output terminal of Mini LED3 is electrically connected to the input terminal of Mini LED4, and the output terminal of Mini LED4 is grounded.
- the non-inverting input terminal of the first operational amplifier A1 is connected between the first driving thin film transistor T2 and the Mini LED1 through the second resistor R2.
- the non-inverting input terminal of the second operational amplifier A2 is connected between the second driving thin film transistor T4 and the Mini LED3 through the fourth resistor R4.
- the non-inverting input terminal of the first operational amplifier A1 can also be connected between Mini LED1 and Mini LED2 through the second resistor R2.
- the non-inverting input terminal of the second operational amplifier A2 can be connected through the fourth resistor R4. Connected between Mini LED3 and Mini LED4.
- circuit connection relationship between the comparison circuit, the control circuit and the adjustment circuit in the drive control circuit provided by the second embodiment of the present application is the same as the circuit connection relationship between the comparison circuit, the control circuit and the adjustment circuit in the drive control circuit provided by the first embodiment. Similar, will not be repeated here.
- the comparison circuit provided in the second embodiment of the present application can compare the magnitude of the first driving current and the second driving current, and output the comparison result to the control circuit 50; the control circuit 50 can connect the comparison circuit 30 and the adjustment circuit 40 during the current adjustment stage, Keep the entire drive control circuit in the path, and during the normal display stage, disconnect the path between the comparison circuit 30 and the adjustment circuit 40 to disconnect the entire drive control circuit; the adjustment circuit 40 can adjust the first drive current and the second drive current, This makes the brightness of the first light-emitting element and the second light-emitting element more uniform and improves the display effect of the display device.
- each light-emitting element can be a separate partition, and its corresponding driving power supply can independently provide driving current.
- the driving current of each light-emitting element can be adjusted to make the luminous brightness of the display device more uniform; also Multiple light-emitting elements can correspond to one partition, and each partition corresponds to a driving power supply. This can reduce the integration level of the circuit and save costs.
- the display device contains at least 2 partitions. .
- the circuit modules illustrated in the embodiments of the present application do not constitute a specific limitation on the above-mentioned drive control circuit.
- the drive control circuit may include more or less circuit modules than shown in the figures, or some circuit modules may be combined, or some circuit modules may be separated; each circuit module may also include more circuit modules than those shown in the figures. More or less devices.
- the illustrated circuit modules may be implemented in hardware, software, or a combination of software and hardware.
- the drive control circuit and display device include a first drive circuit, a second drive circuit, a comparison circuit and an adjustment circuit; the input end of the first drive circuit is electrically connected to the first power supply, and the first drive circuit is used to Output a first driving current to the first light-emitting element; the input end of the second driving circuit is electrically connected to the second power supply, and the second driving circuit is used to output the second driving current to the second light-emitting element; the comparison circuit is connected to the first driving circuit respectively.
- the output end of the second drive circuit is electrically connected to the output end of the second drive circuit.
- the comparison circuit is used to compare the magnitude of the first drive current and the second drive current, and output the comparison result to the adjustment circuit.
- the adjustment circuit is used to adjust the first power supply according to the comparison result. and/or current from the second source.
- the comparison circuit is used to compare the magnitudes of the first driving current and the second driving current, and then the adjustment circuit is used to adjust the current of the first power supply and/or the second power supply according to the comparison result, so that the first driving current and the second driving current can be adjusted.
- the driving current is more consistent, so that the luminous brightness of each light-emitting element in the display device can be made more uniform without increasing the display panel wiring and thin film transistors of the display device, thus improving the display effect of the display device.
- A/B can mean A or B; "and/or” in this application only means It is an association relationship that describes associated objects. It means that there can be three relationships.
- a and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. Among them, A and B Can be singular or plural.
- plural means two or more than two.
- At least one of the following or similar expressions thereof refers to any combination of these items, including any combination of single or plural items.
- at least one of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.
- the term “if” may be interpreted as “when” or “once” or “in response to determining” or “in response to detecting” depending on the context. ". Similarly, the phrase “if determined” or “if [the described condition or event] is detected” may be interpreted, depending on the context, to mean “once determined” or “in response to a determination” or “once the [described condition or event] is detected ]” or “in response to detection of [the described condition or event]”.
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Abstract
一种驱动控制电路和显示装置,驱动控制电路包括第一驱动电路(10)、第二驱动电路(20)、比较电路(30)和调整电路(40);第一驱动电路(10)的输入端与第一电源(Vdd1)电连接,用于向第一发光元件输出第一驱动电流;第二驱动电路(20)的输入端与第二电源(Vdd2)电连接,用于向第二发光元件输出第二驱动电流;比较电路(30)分别与第一驱动电路(10)的输出端和第二驱动电路(20)的输出端电连接,用于比较第一驱动电流和第二驱动电流的大小,向调整电路(40)输出比较结果;调整电路(40)用于根据比较结果,调整第一电源(Vdd1)和/或第二电源(Vdd2)的电流。显示装置的驱动控制电路可以使第一驱动电流和第二驱动电流趋近一致,可以在不增加显示装置的显示面板布线和薄膜晶体管的情况下,使显示装置中各发光元件的发光亮度更加均匀,从而提高显示装置的显示效果。
Description
相关申请的交叉引用
本申请要求2022年05月10日提交的中国专利申请202210504592.5的优先权,其全部内容通过引用并入本文。
本申请涉及液晶显示技术领域,特别是涉及一种驱动控制电路和显示装置。
发光二极管(Light Emitting Diode,LED)显示装置因为具备轻薄、节能、宽视角、色域广、对比度高等特性,而被越来越广泛地应用于电视、手机等产品中。
其中,LED显示装置中的发光元件LED是电流驱动器件,当有电流流经LED时,LED发光,且发光亮度由流经LED的电流决定。
由于驱动薄膜晶体管在应用过程中的材料老化等原因,驱动控制电路中的驱动薄膜晶体管的阈值电压会出现漂移现象,从而导致LED的驱动电流变化,使显示装置中各LED的发光亮度不均匀而影响显示装置的显示效果。
发明内容
本申请提供一种驱动控制电路和显示装置,用以调整各驱动控制电路中各发光元件的驱动电流,从而使各发光元件的驱动电流趋近一致,进而提高显示装置的显示效果。
为了实现上述目的,第一方面,本申请实施例提供一种驱动控制电路,包括:第一驱动电路、第二驱动电路、比较电路和调整电路;
所述第一驱动电路的输入端与第一电源电连接,所述第一驱动电路 用于向第一发光元件输出第一驱动电流;
所述第二驱动电路的输入端与第二电源电连接,所述第二驱动电路用于向第二发光元件输出第二驱动电流;
所述比较电路分别与所述第一驱动电路的输出端和所述第二驱动电路的输出端电连接,所述比较电路用于比较所述第一驱动电流和所述第二驱动电流的大小,向所述调整电路输出比较结果;
所述调整电路用于根据所述比较结果,调整所述第一电源和/或第二电源的电流。
第二方面,本申请实施例提供一种显示装置,包括发光元件和上述第一方面所述的驱动控制电路。
本申请实施例提供的驱动控制电路和显示装置,包括第一驱动电路、第二驱动电路、比较电路和调整电路;第一驱动电路的输入端与第一电源电连接,第一驱动电路用于向第一发光元件输出第一驱动电流;第二驱动电路的输入端与第二电源电连接,第二驱动电路用于向第二发光元件输出第二驱动电流;比较电路分别与第一驱动电路的输出端和第二驱动电路的输出端电连接,比较电路用于比较第一驱动电流和第二驱动电流的大小,向调整电路输出比较结果;调整电路用于根据比较结果,调整第一电源和/或第二电源的电流。上述技术方案中,通过比较电路比较第一驱动电流和第二驱动电流的大小,然后通过调整电路根据比较结果调整第一电源和/或第二电源的电流,可以使第一驱动电流和第二驱动电流更加趋近一致,这样就可以在不增加显示装置的显示面板布线和薄膜晶体管的情况下,使显示装置中各发光元件的发光亮度更加均匀,从而提高显示装置的显示效果。
图1为本申请实施例提供的显示面板与发光元件的驱动电源的连接关系示意图;
图2为本申请实施例提供的显示装置的结构示意图;
图3为本申请第一实施例提供的驱动控制电路的电路结构示意图;
图4为本申请第二实施例提供的驱动控制电路的电路结构示意图。
下面结合本申请实施例中的附图对本申请实施例进行描述。本申请实施例的实施方式部分使用的术语仅用于对本申请的具体实施例进行解释,而非旨在限定本申请。下面这几个具体的实施例可以相互结合,对于相同或相似的概念或过程可能在某些实施例不再赘述。
图1为本申请实施例提供的显示面板与发光元件的驱动电源的连接关系示意图,如图1所示,显示装置可以包括显示面板和多个发光元件驱动电源,其中,显示面板中包括多个发光元件,每个发光元件驱动电源可以为一个或多个发光元件提供驱动电流。
发光元件的驱动薄膜晶体管在应用过程中由于材料老化等原因,其阈值电压会出现漂移现象,从而导致发光元件的驱动电流变化,使显示装置中各发光元件的发光亮度不均匀而影响显示装置的显示效果。有鉴于此,本申请实施例提供一种驱动控制电路,用以调整各驱动电路中发光元件的驱动电流,从而使各发光元件的驱动电流趋近一致,进而提高显示装置的显示效果。
图2为本申请提供的显示装置的结构示意图,如图2所示,显示装置可以包括:第一电源Vdd1、第二电源Vdd2、第一发光元件、第二发光元件和驱动控制电路。
驱动控制电路可以包括第一驱动电路10、第二驱动电路20、比较电路30和调整电路40。
第一电源Vdd1可以向第一发光元件提供稳定的电流,第二电源Vdd2可以向第二发光元件提供稳定的电流。
第一驱动电路10的输入端与第一电源Vdd1电连接,第一驱动电路10用于向第一发光元件输出第一驱动电流。
第二驱动电路20的输入端与第二电源Vdd2电连接,第二驱动电路20用于向第二发光元件输出第二驱动电流。
第一驱动电路和第二驱动电路可以是显示装置中的任意两个驱动电路。
比较电路30分别与第一驱动电路10的输出端和第二驱动电路20的输出端电连接,比较电路30用于比较第一驱动电流和第二驱动电流的大小,向调整电路40输出比较结果。
比较电路30可以采用比较器实现,考虑到比较器会分流发光元件的驱动电流,从而影响发光元件的发光,为了降低对发光元件的驱动电流的影响,比较电路30中可以先通过高电阻值的运放电路对第一驱动电路10和第二驱动电路20进行电流隔离后,再进行比较。
具体地,比较电路30可以包括第一运放电路31、第二运放电路32和电压比较器33。
第一运放电路31的输入端与第一驱动电路10的输出端电连接。
第二运放电路32的一输入端与第一运放电路31的输出端电连接,第二运放电路32的另一输入端与第二驱动电路20的输出端电连接。
电压比较器33的输入端与第二运放电路32的输出端电连接,电压比较器33用于向调整电路40输出比较结果。
调整电路40用于根据比较结果,调整第一电源Vdd1和/或第二电源Vdd2的电流。
具体地,在显示装置处于电流调整阶段时,可以向第一驱动电路和第二驱动电路提供相同的数据线电压,然后通过比较电路30比较第一驱动电流和第二驱动电流的大小,再由调整电路40根据比较结果调整第一电源和/或第二电源的电流;调整完之后,显示装置可以进入正常显示阶段,此时可以关断调整电路40。
电流调整阶段可以是显示装置开机后的一段时间,在这段时间,可以让第一电源Vdd1和第二电源Vdd2的电流相等,此时,显示屏显示纯色画面,调整电路40可以通过调整第一电源Vdd1和第二电源Vdd2的电流,使得第一发光元件和第二发光元件的驱动电流趋近于一致;正常显示阶段可以是其他时间段,在正常显示阶段可以不进行电流调整。
其中,可以通过关断调整电路40的电源来关断调整电路40;也可以如图2所示的,在比较电路30和调整电路40之间连接控制电路50,通过控制电路50关断比较电路30和调整电路40之间的通路。
当处于电流调整阶段时,可以通过控制电路50连通比较电路30和 调整电路40;当处于正常显示阶段时,可以通过控制电路50关断比较电路30和调整电路40之间的通路,使整个驱动控制电路断开。通过上述控制电路50可以灵活地控制电流调整时机,在需要调整电流时连通比较电路30和调整电路40,在不需要的时候关断比较电路30和调整电路40;而且,在不需要的时候关断比较电路30和调整电路40,也可以减小整个驱动控制电路的功耗;此外,控制电路50连接在比较电路30和调整电路40之间,也可以起到输出隔离的作用。
发光元件可以是OLED、无机发光二极管(Light Emitting Diodes,LED)、量子点发光二极管(Quantum Dot Light Emitting Diodes,QLED)和次毫米发光二极管(Mini Light Emitting Diodes,Mini LED)中的任意一种;下面分别以发光元件为OLED和Mini LED为例,进行示例性说明。
第一实施例:
在本申请的第一实施例中,第一发光元件和第二发光元件均为OLED。
图3为本申请第一实施例提供的驱动控制电路的电路结构示意图,如图2、图3所示,第一驱动电路10可以包括第一开关管T1、第一扫描线Scan1、第一驱动薄膜晶体管T2和第一电容C1。
第一开关管T1的栅极与第一扫描线Scan1电连接,第一开关管T1的漏极与第一数据线Data1的输出端电连接,第一开关管T1的源极与第一驱动薄膜晶体管T2的栅极电连接。
第一驱动薄膜晶体管T2的漏级与第一电源Vdd1电连接,第一驱动薄膜晶体管T2的源级与OLED1的阳极电连接,OLED1的阴极接地。
第一电容C1的两端分别与第一驱动薄膜晶体管T2的栅极和OLED1的阴极电连接。
第二驱动电路20可以包括第二开关管T3、第二扫描线Scan2、第二驱动薄膜晶体管T4和第二电容C2。
第二开关管T3的栅极与第二扫描线Scan2电连接,第二开关管T3的漏极与第二数据线Data2的输出端电连接,第二开关管T3的源极与第二驱动薄膜晶体管T4的栅极电连接。
第二驱动薄膜晶体管T4的漏级与第二电源Vdd2电连接,第二驱动薄膜晶体管T4的源级与OLED2的阳极电连接,OLED2的阴极接地。
第二电容C2的两端分别与第二驱动薄膜晶体管T4的栅极和OLED2的阴极电连接。
第一运放电路31可以包括第一运算放大器A1、第一反馈电阻Rf1、第一电阻R1和第二电阻R2。
第一运算放大器A1的反相输入端通过第一电阻R1接地,第一运算放大器A1的正相输入端通过第二电阻R2与第一驱动电路10的输出端电连接。
第一反馈电阻Rf1的一端与第一运算放大器A1的反相输入端电连接,第一反馈电阻Rf1的另一端与第一运算放大器A1的输出端电连接。
第一运算放大器A1的输出端与第二运放电路32电连接,由于第一运算放大器A1的电阻值相对于OLED1的电阻值无穷大,因此第一运放电路31可以在几乎不影响OLED1的驱动电流的情况下,输出第一运放电压。
第一运放电压可以根据以下公式(1)计算:
其中,uo1为第一运放电压,ui1为OLED1的驱动电压。
第二运放电路32可以包括第二运算放大器A2、第二反馈电阻Rf2、第三电阻R3和第四电阻R4。
第二运算放大器A2的反相输入端通过第三电阻R3与第一运算放大器A1的输出端电连接,第二运算放大器A2的正相输入端通过第四电阻R4与第二驱动电路20的输出端电连接。
第二反馈电阻Rf2的一端与第二运算放大器A2的反相输入端电连接,第二反馈电阻Rf2的另一端与第二运算放大器A2的输出端电连接。
第二运算放大器A2的输出端与电压比较器33的输入端电连接,由于第二运算放大器A2的电阻值相对于OLED2的电阻值无穷大,因此第二运放电路32可以在几乎不影响OLED2的驱动电流的情况下,输出第二运放电压。
第二运放电压可以根据以下公式(2)计算:
其中,uo2为第二运放电压,ui2为OLED2的驱动电压。
为了便于计算,第三电阻R3可以和第一反馈电阻Rf1的电阻值相等,第二反馈电阻Rf2可以和第一电阻R1的电阻值相等,此时,公式(2)可以简化为以下公式(3):
根据上述公式(3)可以知道,在ui1<ui2的情况下,uo2>0;在ui1>ui2的情况下,uo2<0;在ui2=ui1的情况下,uo2=0。
由于在OLED1的电阻值与OLED2的电阻值相等的情况下,驱动电压相对更大的OELD,其驱动电流也相对更大,因此,在第一驱动电流小于第二驱动电流的情况下,uo2>0;在第一驱动电流大于第二驱动电流的情况下,uo2<0;在第一驱动电流等于第二驱动电流的情况下,uo2=0。
本实施例中电压比较器33为放大器A3,电压比较器33的一输入端与第二运放电路32的输出端电连接,电压比较器33的另一输入端接地,电压比较器33可以比较uo2和0的大小,在uo2>0的情况下(即第一驱动电流小于第二驱动电流),可以向控制电路50输出第一电平信号(比如高电平信号);在uo2<0的情况下(即第一驱动电流大于第二驱动电流),可以向控制电路50输出第二电平信号(比如低电平信号)。
控制电路50可以是CMOS电路也可以是其他具有开关功能的电路,本实施后续以控制电路50为CMOS电路为例,进行示例性说明。
具体地,控制电路50可以包括第一MOS管T5、第二MOS管T6、第三MOS管T7、第四MOS管T8和第三电源VA。
第一MOS管T5的栅极与电压比较器33的输出端电连接,第一MOS管T5的源极与第三电源VA电连接,第一MOS管T5的漏极与第三MOS管T7的漏极电连接。
第三MOS管T7的栅极与电压比较器33的输出端电连接,第三MOS 管T7的源极接地。
第二MOS管T6的栅极连接在第一MOS管T5漏极和第三MOS管T7漏极的电路之间,第二MOS管T6的源极与第三电源VA电连接,第二MOS管T6的漏极与第四MOS管T8的漏极电连接。
第四MOS管T8的栅极连接在第一MOS管T5漏极和第三MOS管T7漏极的电路之间,第四MOS管T8的源极接地。
第三电源VA可以为第一MOS管T5和第二MOS管T6提供源极电压,第三电源VA提供的电压可以是固定的电压值,也可以根据OLED1的驱动电压和OLED2的驱动电压进行调整。
第三电源VA可以在电流调整阶段,为第一MOS管T5和第二MOS管T6提供源极电压,使整个驱动控制电路保持通路,进而去调整第一驱动电流和第二驱动电流,使其趋近于一致,在正常显示阶段,使整个驱动控制电路断开,从而减小整个驱动控制电路的功耗。
第三电源VA提供的源极电压可以根据电压比较器33输出的比较结果进行调整。具体地,在电压比较器33输出的电平信号高于第一电压阈值时,第三电源VA提供的源极电压可以等于第一电压阈值,以避免电压比较器33输出的电平信号损坏调整电路;在电压比较器33输出的电平信号低于于第二电压阈值时,第三电源VA提供的源极电压可以等于第二电压阈值,以避免电压比较器33输出的电平信号无法驱动调整电路,其中,第一电压阈值大于第二电压阈值。
第一MOS管T5和第二MOS管T6可以是PMOS管,第三MOS管T7和第四MOS管T8可以是NMOS管。在电压比较器33输出高电平时,第二MOS管T6和第三MOS管T7可以为导通状态,控制电路50可以输出一个放大的高电平信号;在电压比较器33输出低电平时,第一MOS管T5和第四MOS管T8可以为导通状态,控制电路50可以输出一个放大的低电平信号,从而使调整电路40更容易区分接收到的电平信号的高低。
调整电路40的输入端连接在第二MOS管T6的漏极和第四MOS管T8的漏极之间,当控制电路50输出第一电平信号(比如高电平信号)时(即第一驱动电流小于第二驱动电流),调整电路40可以增大第一 电源Vdd1的电流,和/或,减小第二电源Vdd2的电流;当控制电路50输第二电平信号(比如低电平信号)时(即第一驱动电流大于第二驱动电流),调整电路40可以减小第一电源Vdd1的电流,和/或,增大第二电源Vdd2的电流,使第一驱动电流和第二驱动电流趋近于一致。
调整电路40可以在控制电路50导通的时间内,多次调整第一电源Vdd1和/或第二电源Vdd2的电流,使第一驱动电流和第二驱动电流更趋近于一致。
可以理解的是,本实施例提供的显示装置中还可以包含多个驱动控制电路,这些驱动控制电路可以分别调整目标OLED与其他OLED的驱动电流,使其他OLED的驱动电流均与目标OLED的驱动电流趋近一致,其中,目标OLED可以是显示装置中任意一个OLED。
例如,显示装置中存在4个OLED,这4个OLED分别为OLED1、OLED2、OLED3和OLED4,目标OLED可以是OLED1,该显示装置可以包含3个上述驱动控制电路,这3个驱动控制电路分别用于调整OLED2、OLED3和OLED4的驱动电流,使OLED2、OLED3和OLED4的驱动电流最终都趋近于OLED1的驱动电流,这样就可以使该显示装置中各OLED的发光亮度更加均匀,从而提高显示装置的显示效果。
显示装置中的其他驱动控制电路与上述驱动控制电路的电路连接关系及原理一致,在此不再赘述。
第二实施例:
在本申请的第二实施例中,第一发光元件和第二发光元件为Mini LED,其中,第一发光元件和第二发光元件均可以包括多个,各个第一发光元件串联,各个第二发光元件串联,下面以第一发光元件和第二发光元件均包括两个为例,进行示例性说明。
图4为本申请第二实施例提供的驱动控制电路的电路结构示意图,如图4所示,第一发光元件包括串联在一起的Mini LED1和Mini LED2,第二发光元件包扩串联在一起的Mini LED3和Mini LED4。
Mini LED1的输入端和T2的源级电连接,Mini LED1的输出端和Mini LED2的输入端电连接,Mini LED2的输出端接地。
Mini LED3的输入端和T4的源级电连接,Mini LED3的输出端和 Mini LED4的输入端电连接,Mini LED4的输出端接地。
第一运算放大器A1的正相输入端通过第二电阻R2连接在第一驱动薄膜晶体管T2和Mini LED1之间。
第二运算放大器A2的正相输入端通过第四电阻R4连接在第二驱动薄膜晶体管T4和Mini LED3之间。
可以理解的是,第一运算放大器A1的正相输入端也可以通过第二电阻R2连接在Mini LED1和Mini LED2之间,对应的,第二运算放大器A2的正相输入端通过第四电阻R4连接在Mini LED3和Mini LED4之间。
本申请第二实施例提供的驱动控制电路中的比较电路、控制电路和调整电路的电路连接关系与上述第一实施例提供的驱动控制电路中的比较电路、控制电路和调整电路的电路连接关系类似,此处不再赘述。
本申请第二实施例提供的比较电路可以比较第一驱动电流和第二驱动电流的大小,向控制电路50输出比较结果;控制电路50可以在电流调整阶段,连通比较电路30和调整电路40,使整个驱动控制电路保持通路,在正常显示阶段,断开比较电路30和调整电路40之间的通路,使整个驱动控制电路断开;调整电路40可以调整第一驱动电流和第二驱动电流,使其趋近于一致,从而使第一发光元件和第二发光元件的亮度更加均匀,提高显示装置的显示效果。
可以理解的是,每个发光元件可以是一个单独的分区,由各自对应的驱动电源单独提供驱动电流,这样就可以通过调整每个发光元件的驱动电流,使显示装置的发光亮度更加均匀;也可以是多个发光元件对应一个分区,每个分区对应一个驱动电源,这样可以降低电路的集成度,节约成本,其中,在多个发光元件对应一个分区的情况下,显示装置至少包含2个分区。
另外,本申请实施例示意的电路模块并不构成对上述驱动控制电路的具体限定。在本申请另一些实施例中,驱动控制电路可以包括比图示更多或更少的电路模块,或者组合某些电路模块,或者拆分某些电路模块;各个电路模块也可以包括比图示更多或更少的器件。图示的电路模块可以以硬件,软件或软件和硬件的组合实现。
本申请实施例提供的驱动控制电路和显示装置,包括第一驱动电路、第二驱动电路、比较电路和调整电路;第一驱动电路的输入端与第一电源电连接,第一驱动电路用于向第一发光元件输出第一驱动电流;第二驱动电路的输入端与第二电源电连接,第二驱动电路用于向第二发光元件输出第二驱动电流;比较电路分别与第一驱动电路的输出端和第二驱动电路的输出端电连接,比较电路用于比较第一驱动电流和第二驱动电流的大小,向调整电路输出比较结果;调整电路用于根据比较结果,调整第一电源和/或第二电源的电流。上述技术方案中,通过比较电路比较第一驱动电流和第二驱动电流的大小,然后通过调整电路根据比较结果调整第一电源和/或第二电源的电流,可以使第一驱动电流和第二驱动电流更加趋近一致,这样就可以在不增加显示装置的显示面板布线和薄膜晶体管的情况下,使显示装置中各发光元件的发光亮度更加均匀,从而提高显示装置的显示效果。
在上述实施例中,对各个实施例的描述都各有侧重,某个实施例中没有详述或记载的部分,可以参见其它实施例的相关描述。
应当理解,当在本申请说明书和所附权利要求书中使用时,术语“包括”指示所描述特征、整体、步骤、操作、元素和/或组件的存在,但并不排除一个或多个其它特征、整体、步骤、操作、元素、组件和/或其集合的存在或添加。
在本申请中出现的对步骤进行的命名或者编号,并不意味着必须按照命名或者编号所指示的时间/逻辑先后顺序执行方法流程中的步骤,已经命名或者编号的流程步骤可以根据要实现的技术目的变更执行次序,只要能达到相同或者相类似的技术效果即可。
在本申请的描述中,除非另有说明,“/”表示前后关联的对象是一种“或”的关系,例如,A/B可以表示A或B;本申请中的“和/或”仅仅是一种描述关联对象的关联关系,表示可以存在三种关系,例如,A和/或B,可以表示:单独存在A,同时存在A和B,单独存在B这三种情况,其中A,B可以是单数或者复数。
并且,在本申请的描述中,除非另有说明,“多个”是指两个或多 于两个。“以下至少一项”或其类似表达,是指的这些项中的任意组合,包括单项或复数项的任意组合。例如,a,b,或c中的至少一项,可以表示:a,b,c,a-b,a-c,b-c,或a-b-c,其中a,b,c可以是单个,也可以是多个。
如在本申请说明书和所附权利要求书中所使用的那样,术语“如果”可以依据上下文被解释为“当...时”或“一旦”或“响应于确定”或“响应于检测到”。类似地,短语“如果确定”或“如果检测到[所描述条件或事件]”可以依据上下文被解释为意指“一旦确定”或“响应于确定”或“一旦检测到[所描述条件或事件]”或“响应于检测到[所描述条件或事件]”。
另外,在本申请说明书和所附权利要求书的描述中,术语“第一”、“第二”、“第三”等是用于区别类似的对象,而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换,以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。
在本申请说明书中描述的参考“一个实施例”或“一些实施例”等意味着在本申请的一个或多个实施例中包括结合该实施例描述的特定特征、结构或特点。由此,在本说明书中的不同之处出现的语句“在一个实施例中”、“在一些实施例中”、“在其他一些实施例中”、“在另外一些实施例中”等不是必然都参考相同的实施例,而是意味着“一个或多个但不是所有的实施例”,除非是以其他方式另外特别强调。
最后应说明的是:以上各实施例仅用以说明本申请的技术方案,而非对其限制;尽管参照前述各实施例对本申请进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。
Claims (17)
- 一种驱动控制电路,其中,包括:第一驱动电路、第二驱动电路、比较电路和调整电路;所述第一驱动电路的输入端与第一电源电连接,所述第一驱动电路用于向第一发光元件输出第一驱动电流;所述第二驱动电路的输入端与第二电源电连接,所述第二驱动电路用于向第二发光元件输出第二驱动电流;所述比较电路分别与所述第一驱动电路的输出端和所述第二驱动电路的输出端电连接,所述比较电路用于比较所述第一驱动电流和所述第二驱动电流的大小,向所述调整电路输出比较结果;所述调整电路用于根据所述比较结果,调整所述第一电源和/或第二电源的电流。
- 根据权利要求1所述的驱动控制电路,其中,所述比较电路包括:第一运放电路、第二运放电路和电压比较器,所述第一运放电路的一输入端接地,所述第一运放电路的另一输入端与所述第一驱动电路的输出端电连接;所述第二运放电路的一输入端与所述第一运放电路的输出端电连接,所述第二运放电路的另一输入端与所述第二驱动电路的输出端电连接;所述电压比较器的一输入端与所述第二运放电路的输出端电连接,所述电压比较器的另一输入端接地,所述电压比较器用于向所述调整电路输出比较结果。
- 根据权利要求2所述的驱动控制电路,其中,所述第一运放电路包括:第一运算放大器、第一反馈电阻、第一电阻和第二电阻;所述第一运算放大器的反相输入端通过所述第一电阻接地;所述第一运算放大器的正相输入端通过所述第二电阻与所述第一驱动电路的输出端电连接;所述第一反馈电阻的一端与所述第一运算放大器的反相输入端电连接,所述第一反馈电阻的另一端与所述第一运算放大器的输出端电连接;所述第一运算放大器的输出端与所述第二运放电路电连接。
- 根据权利要求3所述的驱动控制电路,其中,所述第二运放电路包括:第 二运算放大器、第二反馈电阻、第三电阻和第四电阻;所述第二运算放大器的反相输入端通过所述第三电阻与所述第一运算放大器的输出端电连接;所述第二运算放大器的正相输入端通过所述第四电阻与所述第二驱动电路的输出端电连接;所述第二反馈电阻的一端与所述第二运算放大器的反相输入端电连接,所述第二反馈电阻的另一端与所述第二运算放大器的输出端电连接;所述第二运算放大器的输出端与所述电压比较器的输入端电连接。
- 根据权利要求4所述的驱动控制电路,其中,所述第一电阻和所述第二反馈电阻的电阻值相等,所述第三电阻和所述第一反馈电阻的电阻值相等。
- 根据权利要求1所述的驱动控制电路,其中,所述调整电路具体用于:在所述第一驱动电流小于所述第二驱动电流的情况下,增大所述第一电源的电流,和/或,减小所述第二电源的电流;在所述第一驱动电流大于所述第二驱动电流的情况下,减小所述第一电源的电流,和/或,增大所述第二电源的电流。
- 根据权利要求6所述的驱动控制电路,其中,所述比较电路具体用于:在所述第一驱动电流小于所述第二驱动电流的情况下,向所述调整电路输出高电平信号;在所述第一驱动电流大于所述第二驱动电流的情况下,向所述调整电路输出低电平信号。
- 根据权利要求1所述的驱动控制电路,其中,所述驱动控制电路还包括:控制电路,所述控制电路的输入端与所述比较电路的输出端电连接,所述控制电路的输出端与所述调整电路的输入端电连接,所述控制电路用于连通或关断所述比较电路和所述调整电路之间的通路。
- 根据权利要求8所述的驱动控制电路,其中,所述控制电路为CMOS电路。
- 根据权利要求8所述的驱动控制电路,其中,所述比较电路中的电压比较器具体用于:在所述第一驱动电流小于所述第二驱动电流的情况下,向所述控制电路输出高电平信号;在所述第一驱动电流大于所述第二驱动电流的情况下,向所述控制电路输出低电平信号。
- 根据权利要求10所述的驱动控制电路,其中,所述控制电路包括第一MOS管、第二MOS管、第三MOS管、第四MOS管和第三电源;所述第一MOS管的栅极与所述电压比较器的输出端电连接,所述第一MOS管的源极与所述第三电源电连接,所述第一MOS管的漏极与所述第三MOS管的漏极电连接;所述第三MOS管的栅极与所述电压比较器的输出端电连接,所述第三MOS管的源极接地;所述第二MOS管的栅极连接在所述第一MOS管的漏极和所述第三MOS管的漏极的电路之间,所述第二MOS管的源极与所述第三电源电连接,所述第二MOS管的漏极与所述第四MOS管的漏极电连接;所述第四MOS管的栅极连接在所述第一MOS管的漏极和所述第三MOS管的漏极的电路之间,所述第四MOS管的源极接地;所述第三电源为所述第一MOS管和所述第二MOS管提供源极电压。
- 根据权利要求10所述的驱动控制电路,其中,所述电压比较器为放大器。
- 根据权利要求1所述的驱动控制电路,其中,所述第一发光元件为有机发光二极管、无机发光二极管、量子点发光二极管和次毫米发光二极管中的任意一种;所述第二发光元件为有机发光二极管、无机发光二极管、量子点发光二极管和次毫米发光二极管中的任意一种。
- 根据权利要求13所述的驱动控制电路,其中,所述第一驱动电路包括第一开关管、第一扫描线、第一数据线、第一驱动薄膜晶体管和第一电容;所述第一开关管的栅极与所述第一扫描线电连接,所述第一开关管的漏极与所述第一数据线的输出端电连接,所述第一开关管的源极与所述第一驱动薄膜晶体管的栅极电连接;所述第一驱动薄膜晶体管的漏级与所述第一电源电连接,所述第一驱动薄膜晶体管的源级与所述第一发光元件的阳极电连接,所述第一发光元件的阴极接地;所述第一电容的两端分别与所述第一驱动薄膜晶体管的栅极和所述第一发光元件的阴极电连接。
- 根据权利要求14所述的驱动控制电路,其中,所述第二驱动电路包括第二开关管、第二扫描线、第二数据线、第二驱动薄膜晶体管和第二电容;所述第二开关管的栅极与所述第二扫描线电连接,所述第二开关管的漏极 与所述第二数据线的输出端电连接,所述第二开关管的源极与所述第二驱动薄膜晶体管的栅极电连接;所述第二驱动薄膜晶体管的漏级与所述第二电源电连接,所述第二驱动薄膜晶体管的源级与所述第二发光元件的阳极电连接,所述第二发光元件的阴极接地;所述第二电容的两端分别与所述第二驱动薄膜晶体管的栅极和所述第二发光元件的阴极电连接。
- 根据权利要求13所述的驱动控制电路,其中,所述第一发光元件和所述第二发光元件均为次毫米发光二极管,所述第一发光元件和所述第二发光元件均包括多个,各个所述第一发光元件串联,各个所述第二发光元件串联。
- 一种显示装置,其中,包括:发光元件;驱动控制电路,所述驱动电路包括:第一驱动电路、第二驱动电路、比较电路和调整电路;所述第一驱动电路的输入端与第一电源电连接,所述第一驱动电路用于向第一发光元件输出第一驱动电流;所述第二驱动电路的输入端与第二电源电连接,所述第二驱动电路用于向第二发光元件输出第二驱动电流;所述比较电路分别与所述第一驱动电路的输出端和所述第二驱动电路的输出端电连接,所述比较电路用于比较所述第一驱动电流和所述第二驱动电流的大小,向所述调整电路输出比较结果;所述调整电路用于根据所述比较结果,调整所述第一电源和/或第二电源的电流。
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