Display drive circuit, display device, and electronic device

Abstract

The application discloses a display driving circuit, a display device and an electronic equipment, wherein a magnitude voltage writing module writes a magnitude voltage data signal provided by a magnitude data signal line according to a scanning signal provided by an (n-1)th scanning signal line and an (n)th scanning signal line and a reference signal provided by a reference signal line; a threshold voltage compensation module compensates a threshold voltage of a driving switch tube according to a scanning signal provided by the (n-1)th scanning signal line; a signal correlation between the (n-1)th scanning signal line and the (n)th scanning signal line is established; a light-emitting control module controls the turn-on and turn-off of the driving switch tube according to a received width voltage data signal, thereby driving a display diode to work, so that PAM and PWM hybrid dimming is realized, the brightness control of a light-emitting device is more accurate, and the display brightness uniformity of the light-emitting device is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display driving circuit, a display device, and an electronic device. Background Technology

[0002] Among related technologies, micro-LEDs are considered the ultimate display technology due to their self-emissive properties and longer lifespan compared to organic light-emitting diodes (OLEDs). However, micro-LEDs have relatively low luminous current, and their current-voltage-luminance (IVL) relationship is non-linear. Therefore, it is difficult to precisely control their brightness simply by adjusting the current, especially at low grayscale levels where color distortion is highly likely. Furthermore, the current driving the luminous element is related to the threshold voltage and mobility of the thin-film transistor (TFT) backplane. These characteristics are easily affected by changes in time, environment, and manufacturing processes, causing deviations and drifts in the driving current, which in turn affect the uniformity of the micro-LED's brightness and its lifespan. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a display driving circuit, display device, and electronic device that achieves hybrid dimming of PAM and PWM, resulting in more precise brightness control of the light-emitting device and improved uniformity of display brightness.

[0004] To address the aforementioned technical problems, this application provides a display driving circuit, including:

[0005] An amplitude voltage writing module is connected to the (n-1)th scan signal line, the nth scan signal line, the mth column amplitude data signal line, and a reference signal line. It is used to control the writing process of the amplitude voltage data signal provided by the amplitude data signal line according to the scan signal provided by the (n-1)th scan signal line and the nth scan signal line, and the reference signal provided by the reference signal line; n is an integer greater than or equal to 2.

[0006] A voltage holding module is connected to the amplitude voltage writing module and the first power supply terminal, and is used to maintain the voltage at the output terminal of the amplitude voltage writing module according to the voltage provided by the first power supply terminal;

[0007] A light-emitting driving module, connected to the display diode, is used to drive the display diode to work;

[0008] A threshold voltage compensation module is connected to the voltage holding module, the (n-1)th scan signal line, and the light-emitting driving module, and is used to compensate the threshold voltage of the driving switch in the light-emitting driving module according to the scan signal provided by the scan signal line.

[0009] The light emission control module is connected to the first power supply terminal, the threshold voltage compensation module, and the m-th column width data signal line. It is used to control the on and off of the light emission driving module according to the width voltage data signal provided by the width data signal line, so as to drive the display diode to work.

[0010] In some embodiments, the amplitude voltage writing module includes: a fourth switch and a fifth switch, the first end of the fourth switch is connected to the reference signal line, the control end of the fourth switch is connected to the (n-1)th scan signal line, the control end of the fifth switch is connected to the nth scan signal line, the first end of the fifth switch is connected to the amplitude data signal line, and the second ends of the fifth switch and the second ends of the fourth switch are connected to the voltage holding module.

[0011] In some embodiments, the voltage holding module includes a first capacitor and a second capacitor. The first end of the first capacitor and the first end of the second capacitor are connected to the amplitude voltage writing module. The second end of the second capacitor is connected to the first power supply terminal. The second end of the first capacitor is connected to the first control terminal of the light-emitting driving module.

[0012] In some embodiments, the threshold voltage compensation module includes a second switching transistor; the control terminal of the second switching transistor is connected to the (n-1)th scan signal line, the first terminal of the second switching transistor is connected to the input terminal of the light-emitting driving module, and the second terminal of the second switching transistor is connected to the first control terminal of the light-emitting driving module.

[0013] In some embodiments, the light-emitting driving module includes a sixth switch and a seventh switch. The first terminal of the sixth switch serves as the input terminal of the light-emitting driving module and is connected to the first power supply terminal via the light-emitting control module. The control terminal of the sixth switch serves as the first control terminal and is connected to the voltage holding module. The second terminal of the sixth switch is connected to the first terminal of the seventh switch. The second terminal of the seventh switch is connected to the positive terminal of the display diode. The control terminal of the seventh switch serves as the second control terminal of the light-emitting driving module and is connected to the light-emitting control module.

[0014] In some embodiments, the light-emitting control module includes an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a third capacitor, a third switch, a thirteenth switch, and a first switch; the control terminals of the first switch and the eighth switch are connected to a first control signal terminal; the first terminal of the first switch is connected to the first power supply terminal; the second terminal of the first switch is connected to the input terminal of the light-emitting driving module; the first terminals of the eighth and ninth switches are connected to a second control terminal of the light-emitting driving module; the control terminal of the ninth switch is connected to the second control signal terminal; and the second terminal of the ninth switch and the tenth switch are connected to a second control signal terminal. The first terminal of the switching transistor is connected to the first terminal of the eleventh switching transistor. The control terminal of the tenth switching transistor is connected to the gating scan signal terminal. The control terminal of the eleventh switching transistor and the second terminal of the tenth switching transistor are connected to the first terminal of the third capacitor. The second terminal of the third capacitor is connected to the sweep frequency signal line. The first control terminal of the thirteenth switching transistor is connected to the gating scan signal terminal. The first terminal of the thirteenth switching transistor is connected to the width data signal line. The second terminal of the thirteenth switching transistor, the second terminal of the eleventh switching transistor, and the first terminal of the third switching transistor are connected together. The control terminal of the third switching transistor is connected to the second control signal terminal. The second terminal of the third switching transistor is connected to the high-level signal terminal.

[0015] In some embodiments, the switching states of the first switch and the eighth switch are mutually exclusive.

[0016] In some embodiments, the first switch is an N-type switch and the eighth switch is a P-type switch.

[0017] A second aspect of this application provides a display device comprising N scan lines, M width data signal lines, M amplitude data signal lines, a reference signal line, a plurality of display diodes, and a plurality of display driving circuits as described in any of the preceding claims. The plurality of display diodes are connected one-to-one with the plurality of display driving circuits. Each display driving circuit is connected to the (n-1)th scan signal line and the nth scan signal line, as well as to the corresponding width data signal line, amplitude data signal line, and reference signal line; 2≤n≤N, where n, M, and N are all positive integers.

[0018] A third aspect of this application provides an electronic device including the display driving circuit described in any of the preceding claims.

[0019] The beneficial effects of this invention are as follows: The amplitude voltage writing module writes the amplitude voltage data signal provided by the amplitude data signal line according to the scanning signal provided by the (n-1)th scan signal line and the nth scan signal line, as well as the reference signal provided by the reference signal line. The threshold voltage compensation module compensates the threshold voltage of the driving switch transistor according to the scanning signal provided by the (n-1)th scan signal line, establishing a signal association between the (n-1)th scan signal line and the nth scan signal line. The light emission control module controls the conduction and cutoff of the driving switch transistor according to the received width voltage data signal, thereby driving the display diode to work. This achieves PAM and PWM hybrid dimming, resulting in more precise brightness control of the light emission device and improving the uniformity of the display brightness of the light emission device.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a first schematic diagram of the display driving circuit provided in an embodiment of the present invention;

[0023] Figure 2 This is a second schematic diagram of the display driving circuit provided in an embodiment of the present invention;

[0024] Figure 3 This is a flowchart illustrating the display driving method provided in an embodiment of the present invention;

[0025] Figure 4 This is a timing diagram of the display driving method provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the display driving circuit provided in an embodiment of the present invention during the charging stage;

[0027] Figure 6 This is a schematic diagram of the display driving circuit provided in the embodiment of the present invention during the compensation stage;

[0028] Figure 7 This is a schematic diagram of the display driving circuit provided in the embodiment of the present invention during the amplitude data writing stage;

[0029] Figure 8 This is a schematic diagram of the display driving circuit provided in the embodiment of the present invention during the pulse width data writing stage;

[0030] Figure 9 This is a schematic diagram of the display driving circuit provided in the embodiment of the present invention during the light-emitting stage. Detailed Implementation

[0031] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0032] Micro LEDs, due to their self-emissive nature and longer lifespan than OLEDs, are considered the ultimate display technology in the industry. However, Micro LEDs have relatively low luminous current and exhibit a non-linear IVL (invisible volume ratio), making it difficult to precisely control brightness simply by adjusting the current. This is especially problematic at low grayscale levels where Micro LEDs are prone to color shift. Furthermore, the current driving the luminous element is related to the threshold voltage and mobility of the TFT backplane, characteristics that are easily affected by changes in time, environment, and manufacturing processes. This leads to deviations and drift in the driving current, impacting the uniformity of brightness and lifespan of the Micro LED display. Therefore, Micro LED display pixel circuits typically incorporate circuits to compensate for TFT characteristic deviations or drift, thus mitigating these issues.

[0033] For controlling the brightness of micro LEDs, pulse amplitude modulation (PAM) or pulse width modulation (PWM) are commonly used. Since the current controlling the light emission of the micro LED chip is a weak current, it is difficult to control the brightness by controlling the current at low gray levels. A single PWM dimming scheme divides each frame display time into n equal subframes, and each pixel unit needs to be turned on once in each subframe. The data voltage input to the chip (IC) determines whether the micro LED emits light during the corresponding time of the subframe. When the resolution is high, the multiple on-times result in a large load and high power consumption on the gate drive circuit.

[0034] To address the aforementioned technical problems, this application provides a display driving circuit, see [link to relevant documentation]. Figure 1 As shown, the display driving circuit in this embodiment includes: an amplitude voltage writing module 100, a voltage holding module 200, a threshold voltage compensation module 300, a light emission control module 400, and a light emission driving module 500. Each display driving circuit can be simultaneously connected to the (n-1)th scan signal line Gn-1, the nth scan signal line Gn, the mth column amplitude data signal line PAm, the mth column width data signal line PWm, and the reference signal line Vref, where m is a positive integer and n is an integer greater than or equal to 2.

[0035] The amplitude voltage writing module 100 is connected to the (n-1)th scan signal line Gn-1, the nth scan signal line Gn, the mth column amplitude data signal line PAm, and the reference signal line Vref. The amplitude voltage writing module 100 is used to control the writing process of the amplitude voltage data signal PAWM provided by the mth column amplitude data signal line PAm according to the scan signals provided by the (n-1)th scan signal line Gn-1 and the nth scan signal line Gn and the reference signal provided by the reference signal line Vref.

[0036] The voltage holding module 200 is connected to the amplitude voltage writing module 100 and the first power supply terminal VDDVDD. The voltage holding module 200 is used to maintain the voltage at the output terminal of the amplitude voltage writing module 100 according to the voltage provided by the first power supply terminal VDD.

[0037] The threshold voltage compensation module 300 is connected to the voltage holding module 200, the (n-1)th scan signal line Gn-1, and the light-emitting driving module 500. The threshold voltage compensation module 300 is used to compensate the threshold voltage of the driving switch in the light-emitting driving module 500 according to the scan signal provided by the (n-1)th scan signal line Gn-1.

[0038] The light-emitting driver module 500 is connected to the display diode (LED) and is used to drive the LED to work. The light-emitting control module 400 is connected to the first power supply terminal VDD, the threshold voltage compensation module 300, and the m-th column width data signal line. The light-emitting control module 400 is used to control the on and off of the light-emitting driver module 500 according to the width voltage data signal provided by the width data signal line, so as to drive the LED to work.

[0039] In this embodiment, the display diode LED is located between the first power supply terminal VDD and the reference ground VSS. The positive terminal of the display diode LED is connected to the first power supply terminal VDD via the light-emitting driving module 500 and the light-emitting control module 400. The working state of the display diode LED is driven by the light-emitting driving module 500. The light-emitting control module 400 controls the power input to the input terminal of the light-emitting driving module 500 according to the first control signal EM1. The threshold voltage compensation module 300 controls the voltage between the input terminal of the light-emitting driving module 500 and its first control terminal according to the scan signal provided by the (n-1)th scan signal line Gn-1, thereby compensating for the threshold voltage of the driving switch in the light-emitting driving module 500. During the continuous charging phase t1, compensation phase t2, amplitude data writing phase t3, width data writing phase t4, and light emission phase t5, the threshold voltage compensation module 300 performs threshold voltage compensation and brightness adjustment on the driving switch. It sequentially charges the control terminal (G) of the driving switch, compensates the threshold voltage of the driving switch, inputs the data voltage, and controls the light emission of the display diode LED, realizing PAM and PWM hybrid dimming. This makes the brightness control of the light-emitting device more precise and improves the uniformity of the display brightness of the light-emitting device.

[0040] In some embodiments, see Figure 2 As shown, the amplitude voltage writing module 100 includes: a fourth switch T4 and a fifth switch T5. The first end of the fourth switch T4 is connected to the reference signal line Vref, the control end of the fourth switch T4 is connected to the (n-1)th scan signal line Gn-1, the control end of the fifth switch T5 is connected to the nth scan signal line Gn, the first end of the fifth switch T5 is connected to the amplitude data signal line, and the second ends of the fifth switch T5 and the second ends of the fourth switch T4 are connected to the voltage holding module 200.

[0041] In this embodiment, the first terminal of the fourth switch T4 is connected to the reference signal line Vref, and its switching state is controlled by the voltage of the (n-1)th scan signal line Gn-1. The switching state of the fifth switch T5 is controlled by the nth scan signal line Gn. The voltages of the (n-1)th scan signal line Gn-1 and the nth scan signal line Gn can control the reference signal line Vref to input a reference voltage to node C through the fourth switch T4, and control the mth amplitude data signal line PAm to write amplitude data to node C.

[0042] In some embodiments, see Figure 2 As shown, the voltage holding module 200 includes a first capacitor C1 and a second capacitor C2. The first end of the first capacitor C1 and the first end of the second capacitor C2 are connected to the amplitude voltage writing module 100. The second end of the second capacitor C2 is connected to the first power supply terminal VDD. The second end of the first capacitor C1 is connected to the first control terminal of the light-emitting driving module 500.

[0043] In this embodiment, the first capacitor C1 and the second capacitor C2 can be used as storage capacitors, which have both coupling and storage functions.

[0044] In some embodiments, see Figure 2 As shown, the threshold voltage compensation module 300 includes a second switch T2; the control terminal of the second switch T2 is connected to the (n-1)th scan signal line Gn-1, the first terminal of the second switch T2 is connected to the input terminal of the light-emitting driving module 500, and the second terminal of the second switch T2 is connected to the first control terminal of the light-emitting driving module 500.

[0045] In this embodiment, node D and node G are connected by a second switch T2. The switching state of the second switch T2 is controlled by the voltage of the (n-1)th scan signal line Gn-1. Threshold compensation is achieved by adjusting the voltage between the gate and drain of the sixth switch T6.

[0046] In some embodiments, see Figure 2 As shown, the light-emitting driving module 500 includes a sixth switch T6 and a seventh switch T7. The first end of the sixth switch T6 serves as the input end of the light-emitting driving module 500 and is connected to the first power supply terminal VDD via the light-emitting control module 400. The control end of the sixth switch T6 serves as the first control end and is connected to the voltage holding module 200. The second end of the sixth switch T6 is connected to the first end of the seventh switch T7. The second end of the seventh switch T7 is connected to the positive terminal of the display diode LED. The control end of the seventh switch T7 serves as the second control end of the light-emitting driving module 500 and is connected to the light-emitting control module 400.

[0047] In this embodiment, the switching state of the seventh switch T7 is controlled by the light emission control module 400. The light emission control module 400 generates a corresponding control level based on the m-th width data signal line PWm to control the switching state of the seventh switch T7, thereby controlling the light emission time.

[0048] In some embodiments, see Figure 2As shown, the light-emitting control module 400 includes a third switch T3, an eighth switch T8, a ninth switch T9, a tenth switch T10, an eleventh switch T11, a thirteenth switch T13, a third capacitor C3, and a first switch T1. The control terminals of the first switch T1 and the eighth switch T8 are connected to a first control signal terminal EM1. The first terminal of the first switch T1 is connected to a first power supply terminal VDD, and the second terminal of the first switch T1 is connected to the input terminal of the light-emitting driving module 500. The first terminals of the eighth switch T8 and the ninth switch T9 are connected to a second control terminal of the light-emitting driving module 500. The control terminal of the ninth switch T9 is connected to a second control signal terminal EM2. The second terminal of the ninth switch T9 and the tenth switch T13 are connected to a second control signal terminal EM2. The first terminal of transistor T10 is connected to the first terminal of the eleventh switch transistor T11. The control terminal of the tenth switch transistor T10 is connected to the gating scan signal terminal SN. The control terminal of the eleventh switch transistor T11 and the second terminal of the tenth switch transistor T10 are connected to the first terminal of the third capacitor C3. The second terminal of the third capacitor C3 is connected to the sweep frequency signal line SWEEP. The first terminal of the thirteenth switch transistor T13 is connected to the gating scan signal terminal SN. The first terminal of the thirteenth switch transistor T13 is connected to the width data signal line. The second terminal of the thirteenth switch transistor T13, the second terminal of the eleventh switch transistor T11, and the first terminal of the third switch transistor T3 are connected together. The control terminal of the third switch transistor T3 is connected to the second control signal terminal EM2. The second terminal of the third switch transistor T3 is connected to the high-level signal terminal VGH.

[0049] In some embodiments, the switching states of the first switch T1 and the eighth switch T8 are mutually exclusive.

[0050] In some embodiments, the first switch T1 is an N-type switch and the eighth switch T8 is a P-type switch.

[0051] In some embodiments, the first switch T1 is an N-type TFT, and the eighth switch T8 is a P-type TFT.

[0052] In some embodiments, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6, the seventh switch T7, the ninth switch T9, the tenth switch T10, the eleventh switch T11, and the thirteenth switch T13 are N-type switches.

[0053] In some embodiments, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, the sixth switch T6, the seventh switch T7, the ninth switch T9, the tenth switch T10, the eleventh switch T11, and the thirteenth switch T13 are N-type TFTs.

[0054] To illustrate the working principle of the above-described display driving circuit, this application provides a display driving method. This method is applied to the display driving circuit as described in any of the above embodiments. (See also...) Figure 3 As shown, the display driving method includes steps S100 to S500.

[0055] In step S100, during the charging phase, the first control signal EM1 and the (n-1)th scan signal line Gn-1 are controlled to be at a high level, while the second control signal EM2, the gating scan signal SN, the nth scan signal line Gn, and the sweep frequency signal line SWEEP are controlled to be at a low level.

[0056] Combination Figure 4 as well as Figure 5 As shown, "×" indicates that the switch is off. During the charging phase t1, the first control signal EM1 is high, the (n-1)th scan signal line Gn-1 is input high, the first switch T1, the second switch T2, and the fourth switch T4 are on, and the remaining control signals, such as the nth scan signal line Gn, the second control signal EM2, and the strobe scan signal SN, remain low. The remaining switches are off, and the mth column width data signal line PWm has no input. Points C and G are charged. The voltage at point C is the voltage of the mth column amplitude data signal line PAm, and the voltage at point G is the voltage of the first power supply VDD.

[0057] In step S200, during the compensation stage t2, the (n-1)th scan signal line Gn-1 is controlled to be at a high level, and the first control signal EM1, the second control signal EM2, the gating scan signal SN, the nth scan signal line Gn, and the sweep frequency signal line SWEEP are controlled to be at a low level.

[0058] Combination Figure 4 as well as Figure 6 As shown, during the compensation phase t2, the (n-1)th scan signal line Gn-1 remains at a high level, the first control signal EM1 is at a low level, the second switch T2, the fourth switch T4, and the eighth switch T8 are turned on, and the remaining switches are turned off. The sixth switch T6 (driving switch) forms a diode connection, and its G point discharges from point D to point S. When the voltage at point G VG = VSS + Vth, the threshold voltage Vth of the sixth switch T6 is extracted to point G, and the discharge at point G ends. VSS is the voltage of the reference ground VSS, and Vth is the threshold voltage of the sixth switch T6.

[0059] In step S300, during the amplitude data writing stage t3, the nth scan signal line Gn is controlled to be high level, and the first control signal EM1, the (n-1)th scan signal line Gn-1, the second control signal EM2, the strobe scan signal SN, and the sweep frequency signal line SWEEP are controlled to be low level.

[0060] Combination Figure 4 as well as Figure 7 As shown, during the amplitude data writing stage t3, the (n-1)th scan signal line Gn-1, the first control signal EM1, and the second control signal EM2 are at low level, the nth scan signal line Gn is at high level, the fifth switch T5 is turned on, and the other switches are turned off. The voltage at point C is Vc = Vref + PAMD, and the voltage at point G is VG = VSS + Vth + Vref + PAMD, where Vref is the voltage at the reference voltage terminal Vref.

[0061] In step S400, during the width data writing stage t4, the control gating scan signal SN is set to a high level, and the first control signal EM1, the (n-1)th scan signal line Gn-1, the second control signal EM2, the nth scan signal line Gn, and the sweep frequency signal line SWEEP are set to a low level.

[0062] In step S500, during the light emission stage t5, the first control signal EM1 and the second control signal EM2 are controlled to be at a high level, the (n-1)th scan signal line Gn-1, the gating scan signal SN, and the nth scan signal line Gn are controlled to be at a low level, and the voltage of the sweep frequency signal line SWEEP is controlled to gradually increase.

[0063] Combination Figure 4 , Figure 8 , Figure 9 As shown, when Gn, the (n-1)th scan signal line Gn-1, and the second control signal EM2 are low, the second switch T2, the third switch T3, the fourth switch T4, the fifth switch T5, and the seventh switch T7 are off. When the selection scan signal SN and the first control signal EM1 are high, the first switch T1, the seventh switch T7, the thirteenth switch T13, and the tenth switch T10 are on, and the remaining switches are off. The width voltage data signal of the m-th column width data signal line PWm is written to the third capacitor C3. When the second control signal EM2 is high, the selection scan signal SN is input at a low voltage. The eleventh switch T11 periodically turns on and off, causing the seventh switch T7 to periodically turn on and off, thereby controlling the light emission time. Since the voltage at point G is VG = VSS + Vth + Vref + PAMD, the ninth switch T9 is operating in the saturation region. The operating current of the display diode LED is:

[0064] I = (1 / 2) * μWCox / (Vgs - Vth) 2 ;

[0065] Vgs=Vg-Vs=(VSS+Vth+Vref+PAMD)-VSS-V led;

[0066] Therefore, I = (1 / 2)*μ*W*Cox / (L*(Vref+PAMD-V led)) 2 );

[0067] μ represents the TFT mobility, determined by the TFT semiconductor material; Cox represents the capacitance per unit area of ​​the TFT device; W / L represents the width-to-length ratio of the TFT channel; and Vref is a constant reference voltage. Therefore, the driving current is actually related to the voltage value of the amplitude voltage data signal PAMD. When the LED enters the light-emitting stage, it is controlled by the width voltage data signal PWMD and the amplitude voltage data signal PAMD. The light-emitting time of the LED (e.g., a micro LED chip) is controlled by adjusting the duty cycle of the width voltage data signal PWMD, and the brightness of the LED is controlled by both the width voltage data signal PWMD and the amplitude voltage data signal PAMD.

[0068] In some embodiments, during the light emission stage t5, the voltage of the control sweep signal line SWEEP increases linearly.

[0069] This application provides a display device, which includes N scan lines, M width data signal lines, M amplitude data signal lines, a reference signal line, a plurality of display diodes (LEDs), and a plurality of display driving circuits as described in any of the above embodiments. The plurality of display diodes (LEDs) are connected one-to-one with the plurality of display driving circuits. Each display driving circuit is connected to the (n-1)th scan signal line Gn-1 and the nth scan signal line Gn, as well as to the corresponding width data signal line, amplitude data signal line, and reference signal line; 2≤n≤N, where n, M, and N are all positive integers.

[0070] This application provides an electronic device including the display driving circuit of any of the above.

[0071] In this embodiment, the amplitude voltage writing module 100 writes the amplitude voltage data signal provided by the amplitude data signal line according to the scanning signals provided by the (n-1)th scan signal line Gn-1 and the nth scan signal line Gn, and the reference signal provided by the reference signal line. The threshold voltage compensation module 300 compensates the threshold voltage of the driving switch transistor according to the scanning signal provided by the scan signal line. The light emission control module 400 drives the display diode LED to work according to the received width voltage data signal, thereby realizing PAM and PWM hybrid dimming, which makes the brightness control of the light emission device more precise and improves the uniformity of the display brightness of the light emission device.

[0072] Other configurations and operations of the electronic devices according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0073] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0074] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A display drive circuit, characterized by comprising: include: An amplitude voltage writing module is connected to the (n-1)th scan signal line, the nth scan signal line, the mth column amplitude data signal line, and a reference signal line. It is used to control the writing process of the amplitude voltage data signal provided by the amplitude data signal line according to the scan signal provided by the (n-1)th scan signal line and the nth scan signal line, and the reference signal provided by the reference signal line; n is an integer greater than or equal to 2. A voltage holding module is connected to the amplitude voltage writing module and the first power supply terminal, and is used to maintain the voltage at the output terminal of the amplitude voltage writing module according to the voltage provided by the first power supply terminal; A light-emitting driving module, connected to the display diode, is used to drive the display diode to work; A threshold voltage compensation module is connected to the voltage holding module, the (n-1)th scan signal line, and the light-emitting driving module, and is used to compensate the threshold voltage of the driving switch in the light-emitting driving module according to the scan signal provided by the scan signal line. The light emission control module is connected to the first power supply terminal, the threshold voltage compensation module, and the m-th column width data signal line. It is used to control the on and off of the light emission driving module according to the width voltage data signal provided by the width data signal line, so as to drive the display diode to work.

2. The display driving circuit according to claim 1, wherein The amplitude voltage writing module includes a fourth switch and a fifth switch. The first end of the fourth switch is connected to the reference signal line, the control end of the fourth switch is connected to the (n-1)th scan signal line, the control end of the fifth switch is connected to the nth scan signal line, the first end of the fifth switch is connected to the amplitude data signal line, and the second ends of the fifth switch and the second ends of the fourth switch are connected to the voltage holding module.

3. The display driving circuit according to claim 1, wherein The voltage holding module includes a first capacitor and a second capacitor. The first end of the first capacitor and the first end of the second capacitor are connected to the amplitude voltage writing module. The second end of the second capacitor is connected to the first power supply terminal. The second end of the first capacitor is connected to the first control terminal of the light-emitting driving module.

4. The display driving circuit according to claim 1, wherein The threshold voltage compensation module includes a second switching transistor; the control terminal of the second switching transistor is connected to the (n-1)th scan signal line, the first terminal of the second switching transistor is connected to the input terminal of the light-emitting driving module, and the second terminal of the second switching transistor is connected to the first control terminal of the light-emitting driving module.

5. The display driving circuit according to claim 1, wherein The light-emitting driving module includes a sixth switch and a seventh switch. The first end of the sixth switch serves as the input terminal of the light-emitting driving module and is connected to the first power supply terminal via the light-emitting control module. The control terminal of the sixth switch serves as the first control terminal and is connected to the voltage holding module. The second end of the sixth switch is connected to the first end of the seventh switch. The second end of the seventh switch is connected to the positive terminal of the display diode. The control terminal of the seventh switch serves as the second control terminal of the light-emitting driving module and is connected to the light-emitting control module.

6. The display driving circuit according to claim 1, wherein The light-emitting control module includes an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a third capacitor, a third switch, a thirteenth switch, and a first switch. The control terminals of the first switch and the eighth switch share a first control signal terminal. The first terminal of the first switch is connected to the first power supply terminal, and the second terminal of the first switch is connected to the input terminal of the light-emitting driving module. The first terminals of the eighth and ninth switches are shared by a second control terminal of the light-emitting driving module. The control terminal of the ninth switch is connected to the second control signal terminal. The second terminal of the ninth switch and the first terminal of the tenth switch... The first terminal is connected to the first terminal of the eleventh switch transistor. The control terminal of the tenth switch transistor is connected to the gating scan signal terminal. The control terminal of the eleventh switch transistor and the second terminal of the tenth switch transistor are connected to the first terminal of the third capacitor. The second terminal of the third capacitor is connected to the sweep frequency signal line. The first control terminal of the thirteenth switch transistor is connected to the gating scan signal terminal. The first terminal of the thirteenth switch transistor is connected to the width data signal line. The second terminal of the thirteenth switch transistor, the second terminal of the eleventh switch transistor, and the first terminal of the third switch transistor are connected together. The control terminal of the third switch transistor is connected to the second control signal terminal. The second terminal of the third switch transistor is connected to the high-level signal terminal.

7. The display driving circuit according to claim 6, characterized in that, The switching states of the first switch and the eighth switch are mutually exclusive.

8. The display driving circuit according to claim 7, wherein, The first switch is an N-type switch, and the eighth switch is a P-type switch.

9. A display device, characterized by comprising: The display device includes N scan lines, M width data signal lines, M amplitude data signal lines, a reference signal line, a plurality of display diodes, and a plurality of display driving circuits as described in any one of claims 1-8. The plurality of display diodes are connected one-to-one with the plurality of display driving circuits. Each display driving circuit is connected to the (n-1)th scan signal line and the nth scan signal line, as well as to the corresponding width data signal line, amplitude data signal line, and reference signal line; 2≤n≤N, where n, M, and N are all positive integers.

10. An electronic device, comprising: include: The display driving circuit as described in any one of claims 1-8.

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