WO2023245569A1

WO2023245569A1 - Display module, driving method for display module, and computer device

Info

Publication number: WO2023245569A1
Application number: PCT/CN2022/100884
Authority: WO
Inventors: 刘国辉
Original assignee: 闻泰通讯股份有限公司
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2023-12-28
Also published as: CN115362492A

Abstract

A display module (100), a driving method for a display module (100), and a computer device (600), which relate to the technical field of displays. The display module (100) comprises: a driving circuit (101, 201) and a display lamp panel (102, 202), wherein the display lamp panel (102, 202) includes at least one pixel circuit (203); the driving circuit (101, 201) is electrically connected to each pixel circuit (203) in the display lamp panel (102, 202); when the grayscale brightness of the pixel circuit (203) is less than a first grayscale threshold, the driving circuit (101, 201) drives the display lamp panel (102, 202) by means of pulse width modulation (PWM); and when the grayscale brightness of the pixel circuit (203) is greater than the first grayscale threshold, the driving circuit (101, 201) drives the display lamp panel (102, 202) by means of an active matrix (AM). The driving circuit (101, 201) in the display module (100) performs driving by using a PWM driving mode within a lower grayscale range, and performs driving by using an AM driving mode within a higher grayscale range, thereby avoiding the phenomenon of a wavelength offset when the display module (100) emits light within a low grayscale range, and improving the light emission stability of the display module (100).

Description

Display module, display module driving method and computer equipment

Technical field

The present disclosure relates to a display module, a driving method of the display module and computer equipment.

Background technique

With the rapid development in the field of display technology, displays are used to implement display functions in various computer equipment. Among them, Micro-light emitting diode (Micro-LED) technology is developing rapidly in the display field.

In Micro-LED display technology, the Micro-LED used can achieve higher brightness and does not have the problem of screen burn-in. Therefore, more and more displays are using Micro-LED. Among them, for Micro-LED, Micro-LED is a current-type light-emitting device, and its wavelength changes depending on the current density. During the driving process, if an active address driving (Active Matrix, AM) pixel circuit is used When driven, the LED's light emission will shift in wavelength in the low gray scale range, and there is a problem of unstable Micro-LED light emission in the low gray scale range.

Contents of the invention

(1) Technical problems to be solved

In the existing technology, if an active address driving (Active Matrix, AM) pixel circuit is used to drive, the LED light emission will have a wavelength shift in the low gray scale range. -The problem of unstable LED lighting.

(2) Technical solutions

According to various embodiments of the present disclosure, a display module, a driving method of the display module and a computer device are provided.

A display module, the display module includes a driving circuit and a display light panel, the display light panel includes at least one pixel circuit;

The driving circuit is electrically connected to each pixel circuit in the display light panel;

The drive circuit is configured to drive the display light panel through pulse width modulation PWM when the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold;

The driving circuit is further configured to drive the display light panel through active address driving AM mode when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold.

As an optional implementation of the embodiment of the present disclosure, the pixel circuit includes a first transmission end, a second transmission end, a third transmission end and a fourth transmission end;

The drive circuit includes a scan line port, a voltage data line port, a lighting duration control line port and a compensation line port;

The first transmission end is electrically connected to the scan line port, the second transmission end is electrically connected to the voltage data line port, and the third transmission end is electrically connected to the lighting duration control line port. , the fourth transmission end is electrically connected to the compensation line port;

The scan line port is configured to transmit a scan signal to the first transmission end, the voltage data line port is configured to transmit a first voltage signal to the second transmission end, and the lighting duration control line port is configured to transmit a first voltage signal to the second transmission end. The third transmission end transmits a duration signal, and the compensation line port is configured to transmit a second voltage signal to the fourth transmission end.

As an optional implementation of the embodiment of the present disclosure, the pixel circuit includes: a first thin film transistor TFT, a second TFT, a third TFT, a fourth TFT, a first capacitor and a light emitting diode;

The drain of the first TFT is electrically connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is electrically connected to the source of the fourth TFT, and the drain of the fourth TFT is connected to the common ground. Electrically connected; the source of the first TFT is electrically connected to the power supply, the gate of the first TFT is electrically connected to the drain of the second TFT, and the gate of the first TFT is electrically connected to the power supply. A first node is included between the drain electrode of the second TFT, a first end of the first capacitor is electrically connected to the first node, and a second node is included between the drain electrode of the first TFT and the light-emitting diode. node, the second end of the first capacitor is electrically connected to the second node, the second node is also electrically connected to the source of the third TFT, and the drain of the third TFT is connected to the reference The voltage terminals are electrically connected;

The gate of the second TFT is the first transmission end of the pixel circuit, the source of the second TFT is the second transmission end of the pixel circuit, and the gate of the fourth TFT is the pixel The third transmission end of the circuit, the gate electrode of the third TFT is the fourth transmission end of the pixel circuit.

As an optional implementation manner of the embodiment of the present disclosure, the driving circuit is further configured to switch the first TFT, the second TFT and the fourth TFT when the gray-scale brightness of the pixel circuit is less than a first gray-scale threshold. Adjust the TFT to the working state, and adjust the third TFT to the closed state;

Wherein, the scanning signal transmitted by the driving circuit to the first transmission end through the scanning line port is a high-level signal; the driving circuit transmits a duration to the third port through the lighting duration control line port. The signal is a high-level signal; the second voltage signal transmitted by the driving circuit to the second transmission terminal through the compensation line port is a low-level signal.

As an optional implementation of the embodiment of the present disclosure, after the driving circuit drives the display light panel to display each gray-scale brightness when the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold, it is also configured to The second voltage signal transmitted from the compensation line port to the second transmission end is adjusted to a high-level signal, and the duration signal transmitted from the lighting duration control line port to the third port is adjusted to a low-level signal; So that the first TFT, the second TFT and the third TFT are in the working state, and the fourth TFT is in the closed state;

the first capacitor is configured to store voltages of the first node and the second node;

After a preset period of time, the driving circuit is further configured to gradually reduce the second voltage signal transmitted from the compensation line port to the second transmission end to a low level signal, so that the first node is connected to the second transmission end. The voltage difference between the second nodes reaches the turn-on voltage of the first TFT.

Optionally, when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, the driving circuit is further configured to adjust the first TFT, the second TFT, the third TFT and the fourth TFT. For working status;

The driving circuit is further configured to readjust the second voltage signal transmitted from the compensation line port to the second transmission end into a high-level signal, so that the voltage at the second node is released.

As an optional implementation method of this disclosure, each display frame in the duration signal corresponds to N subframes, and the display time of the next subframe is twice that of the previous subframe, and N is an integer.

In another aspect, embodiments of the present disclosure provide a driving method for a display module. The display module includes a driving circuit and a display light panel. The display light panel includes at least one pixel circuit. The method is composed of the The driving circuit is executed, and the method includes:

When the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold, the driving circuit drives the display light panel through pulse width modulation (PWM);

When the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, the driving circuit drives the display light panel in an active address driving AM mode.

As an optional implementation of the embodiment of the present disclosure, the driving circuit includes a compensation line port, and the compensation line port is electrically connected to the compensation transmission end of the pixel circuit;

When the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, before the driving circuit drives the display light panel through active address driving AM mode, the method further includes:

The driving circuit performs voltage compensation on the pixel circuit through the compensation line port, so that the voltage between the gate and drain of the TFT connected to the light-emitting diode in the pixel circuit reaches the turn-on voltage.

A computer device, which includes at least one display module as described in the above aspect.

Additional features and advantages of the disclosure will be set forth in the description which follows, and, in part, will be apparent from the description, or may be learned by practice of the disclosure. The objectives and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the specification, claims and appended drawings, and the details of one or more embodiments of the disclosure are set forth in the accompanying drawings and description below.

In order to make the above objects, features and advantages of the present disclosure more obvious and understandable, optional embodiments are listed below and described in detail with reference to the accompanying drawings.

Description of the drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those of ordinary skill in the art, It is said that other drawings can be obtained based on these drawings without exerting creative labor.

Figure 1 is a schematic structural diagram of a display module provided by an exemplary embodiment of the present disclosure;

Figure 2 is a schematic structural diagram of a display module provided by an exemplary embodiment of the present disclosure;

Figure 3 is a schematic structural diagram of a signal transmitted by a driving circuit within a display frame according to an exemplary embodiment of the present disclosure;

Figure 4 is a method flow chart of a driving method for a display module provided by an exemplary embodiment of the present disclosure;

Figure 5 is a structural block diagram of a driving device of a display module provided by an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a computer device provided by an exemplary embodiment of the present disclosure.

Detailed ways

In order to understand the above objects, features and advantages of the present disclosure more clearly, the solutions of the present disclosure will be further described below. It should be noted that, as long as there is no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

Many specific details are set forth in the following description to fully understand the present disclosure, but the present disclosure can also be implemented in other ways different from those described here; obviously, the embodiments in the description are only part of the embodiments of the present disclosure, and Not all examples.

The terms "first", "second", etc. in the description and claims of the present disclosure are used to distinguish different objects, rather than to describe a specific order of objects. For example, the first camera and the second camera are used to distinguish different cameras, rather than to describe a specific order of the cameras.

In the embodiments of the present disclosure, words such as “exemplary” or “for example” mean examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "such as" in the present disclosure is not intended to be construed as preferred or advantageous over other embodiments or designs. To be precise, the use of words such as "exemplary" or "such as" is intended to present relevant concepts in a specific manner. In addition, in the description of the embodiments of the present disclosure, unless otherwise stated, the meaning of "plurality" refers to both one or more than two.

The solution provided by the present disclosure can be used in temperature collection application scenarios in computer equipment used in people's daily lives. To facilitate understanding, some terms and application architectures involved in the embodiments of the present disclosure are briefly introduced below.

With the continuous advancement of science and technology, computer equipment is used more and more frequently in daily life. People can use these computer equipment to study, entertain, work, etc. in daily life. Among them, the display has become one of the indispensable hardware components in computer equipment.

At present, there are more and more types of displays, such as light emitting diode (LED) displays, active matrix liquid crystal displays (Active Matrix Liquid Crystal Display, AM-LCD), active matrix organic light emitting diodes (Active Matrix Organic Light-Emitting Diode, AM-OLED) displays, etc. Active matrix liquid crystal display (AM-LCD) products are widely deployed in the flat panel display market. However, AM-LCD products have major shortcomings such as slow response time, poor conversion efficiency, and low color saturation. Therefore, active matrix organic light-emitting diodes (AM-OLEDs) that can overcome these shortcomings have attracted much attention. Compared with AM-LCD, AM-OLED has the advantages of self-illumination, high contrast, fast response and wide viewing angle. Organic electroluminescent diodes have serious aging problems when they have large currents to achieve high brightness. Among them, among the display driving methods, there are mainly the following two driving methods: passive addressing drive (PM: Passive Matrix, also known as passive addressing, passive addressing, passive drive, etc.) and active addressing Driver (AM: Active Matrix, also known as active addressing, active addressing, active driver, etc.).

On the other hand, Micro-light emitting diode (Micro-LED) technology is developing faster and faster, and is increasingly used in displays. Micro-LEDs can achieve higher Brightness and no screen burn problem. The advantages of Micro-LED are self-illumination, high contrast, fast response, wide viewing angle, power saving, stability and high brightness. Among them, in order to obtain high brightness, Micro-LED displays need to use a backplane to provide large current, and low-temperature polysilicon thin film transistors (LTPS TFTs) are more suitable for configuration into high-brightness Micro-LED displays due to their high mobility and stability. back panel.

However, Micro-LED is a current-type light-emitting device, and its wavelength changes depending on the current density. During the driving process, if an active address driving (Active Matrix, AM) pixel circuit is used to drive, it will appear at low There is a wavelength shift in the light emission of LEDs in the gray scale range, and there is a problem of unstable light emission of Micro-LED in the low gray scale range. If the PWM driving method is used to drive the Micro-LED display, although the LED can be guaranteed to work in a stable light-emitting state , but the brightness cannot be increased.

In order to improve the stability of the display module in the low gray scale range without affecting the display brightness of the display module in the high gray scale range, the present disclosure provides a solution by combining the PWM driving method and the AM driving method. , the display module can flexibly emit light to avoid wavelength shift in the LED light emission in the low gray scale range.

Please refer to FIG. 1 , which shows a schematic structural diagram of a display module provided by an exemplary embodiment of the present disclosure. As shown in FIG. 1 , the display module 100 includes: a driving circuit 101 and a display light panel 102 .

The display light panel includes at least one pixel circuit; the driving circuit is electrically connected to each pixel circuit in the display light panel.

The drive circuit is configured to drive the display light panel through pulse width modulation PWM when the gray scale brightness of the pixel circuit is less than the first gray scale threshold; the drive circuit is also configured to drive the display light panel when the gray scale brightness of the pixel circuit is greater than the first gray scale threshold. The display light panel is driven by active address driving AM mode. Among them, the first grayscale threshold can be set in advance in the driving circuit by developers or operation and maintenance personnel. For example, the first gray-scale threshold can be 31. When the gray-scale brightness of the pixel circuit is less than 31, the driving circuit drives the display light panel through PWM; when the gray-scale brightness of the pixel circuit is greater than 31, the driving circuit drives the display through AM. Light board. That is, the driving circuit in the display module of the present disclosure uses the PWM method to drive the display light panel when the display light panel displays each gray level brightness that is less than the first gray level threshold, and when the display light panel displays a brightness that is greater than the first gray level threshold. At each gray level brightness, the AM method is used to drive the display light panel to avoid the above-mentioned problems.

To sum up, the display module of the present disclosure includes: a drive circuit and a display light panel. The display light panel includes at least one pixel circuit; the drive circuit is electrically connected to each pixel circuit in the display light panel; the drive circuit configuration When the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold, the display light panel is driven by pulse width modulation PWM; the driving circuit is also configured to drive the display light panel through the active mode when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold. The address selection drive AM method drives the display light panel. In the present disclosure, the driving circuit in the display module adopts PWM driving mode in the lower gray scale range and AM driving mode in the higher gray scale range, thereby avoiding the problem that the display module is driven in the low gray scale range. The phenomenon of wavelength shift occurs when emitting light, which improves the stability of the display module's light emission.

In one possible implementation manner, the pixel circuit in the display module provided by the present disclosure is formed based on a combination of thin film transistor (TFT) and light-emitting diode. The formed pixel circuit is simple and can reduce the complexity of the circuit.

Taking the pixel circuit including TFTs and light-emitting diodes as an example, please refer to FIG. 2 , which shows a schematic structural diagram of a display module provided by an exemplary embodiment of the present disclosure. As shown in FIG. 2 , the display module includes: a driving circuit 201 and a display light panel 202 .

Among them, the display light panel 202 includes at least one pixel circuit 203. The pixel circuit 203 includes a first transmission terminal 203a, a second transmission terminal 203b, a third transmission terminal 203c and a fourth transmission terminal 203d; the driving circuit 201 includes a scan line port 201a, The voltage data line port 201b, the lighting duration control line port 201c and the compensation line port 201d.

The driving circuit 201 is electrically connected to each pixel circuit in the display light panel 202. For example, the first transmission terminal 203a is electrically connected to the scan line port 201a, the second transmission terminal 203b is electrically connected to the voltage data line port 201b, and The third transmission end 203c is electrically connected to the lighting duration control line port 201c, and the fourth transmission end 203d is electrically connected to the compensation line port 201d.

Wherein, the drive circuit is configured to drive the display light panel through pulse width modulation PWM when the gray scale brightness of the pixel circuit is less than the first gray scale threshold; the drive circuit is also configured to drive the display light panel when the gray scale brightness of the pixel circuit is greater than the first gray scale threshold. At this time, the display light panel is driven through active address driving AM mode. For example, if the first gray scale threshold is 31 gray scale, then, within the 0-31 gray scale, the driving circuit drives the display light panel through PWM mode, and within the 32-255 gray scale, the driving circuit drives the display light panel through AM mode.

Wherein, the signals transmitted by the ports of the above-mentioned driving circuit may be as follows: the scanning line port of the driving circuit is configured to transmit the scanning signal to the first transmission end, and the voltage data line port of the driving circuit is configured to transmit the first voltage signal to the second transmission end, The lighting duration control line port of the driving circuit is configured to transmit the duration signal to the third transmission end, and the compensation line port of the driving circuit is configured to transmit the second voltage signal to the fourth transmission end.

Optionally, the pixel circuit 203 includes: a first TFT 204, a second TFT 205, a third TFT 206, a fourth TFT 207, a first capacitor 208 and a light emitting diode 209;

The drain of the first TFT 204 is electrically connected to the anode of the light-emitting diode 209, the cathode of the light-emitting diode 209 is electrically connected to the source of the fourth TFT 207, and the drain of the fourth TFT 207 is electrically connected to the common ground terminal VSS; The source of the first TFT 204 is electrically connected to the power supply VDD, the gate of the first TFT 204 is electrically connected to the drain of the second TFT 205, and the gate of the first TFT 204 is electrically connected to the drain of the second TFT 205. Including the first node G, the first end of the first capacitor 208 is electrically connected to the first node G, the second node S is included between the drain of the first TFT 204 and the light-emitting diode 209, and the second end of the first capacitor 208 is electrically connected to the second node S, the second node S is also electrically connected to the source of the third TFT 206, and the drain of the third TFT 206 is electrically connected to the reference voltage terminal Vref;

Among them, the gate of the second TFT 205 is the first transmission end 203a of the pixel circuit, the source of the second TFT 205 is the second transmission end 203b of the pixel circuit, and the gate of the fourth TFT 207 is the third transmission end of the pixel circuit. Terminal 203c, the gate of the third TFT 206 is the fourth transmission terminal 203d of the pixel circuit.

Optionally, the driving circuit can be divided into three stages during the driving process. In the first stage, the gray level brightness in the range of 0 to 31 gray levels is displayed through PWM driving (that is, less than or equal to the 31 gray level threshold). At this time, The scan signal that the drive circuit can transmit to the first transmission end through the scan line port is a high-level signal; the duration signal that the drive circuit transmits to the third port through the light-emitting duration control line port is a high-level signal; the drive circuit can transmit through the compensation line port The second voltage signal transmitted to the second transmission end is a low-level signal, thereby adjusting the first TFT, the second TFT and the fourth TFT to the working state, and adjusting the third TFT to the off state.

Optionally, when the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold, each display frame in the duration signal sent by the driving circuit contains N sub-frames, and the display time of the next sub-frame is the previous sub-frame. One time, N is an integer. For example, N=5, within the range less than the first gray scale threshold (0-31 gray scale), that is, when the driving circuit drives the display light panel through the PWM driving method, the scan transmitted through the scan line port to the first transmission end The signal is a high-level signal, the duration signal transmitted to the third port through the lighting duration control line port is a high-level signal, and the second voltage signal transmitted to the second transmission end through the compensation line port is a low-level signal, so that the third The first TFT, the second TFT and the fourth TFT are in the working state, and the third TFT is in the closed state. The driving circuit is turned on in sequence through the scan line port to scan the pixel circuits of each row in the display light panel, and will need to be connected in some cases. The pixel circuits that are lit within the subframe are lit.

For example, when displaying 15 gray levels, the driver circuit can control the pixel circuit to light up in the subframes where the 1st subframe, 2nd subframe, 3rd subframe and 4th subframe are located. The display brightness of the pixel circuit is these subframes. The accumulation of brightness creates a brightness of 15 gray levels. That is, the driving circuit transmits high-level signals to the third transmission end of the pixel circuit through the light-emitting duration control line port in the 1st subframe, 2nd subframe, 3rd subframe and 4th subframe respectively, so that the pixel circuit The display brightness is the accumulation of the brightness of these subframes. Since the display time of the next subframe is twice as long as the previous subframe, the final accumulated control display duration T _display = T*(1+2+4+8 ), completes the brightness accumulation to achieve a display of 15 gray-scale brightness, where T is the unit light-emitting time of the pixel circuit, and the T can be preset by the developer in the drive circuit. The display method of other 0-31 grayscale brightness is also similar, so I won’t go into details here. Among them, the driving circuit can also adjust the current flowing through the LED in the pixel circuit through the voltage input from the voltage data line port.

Optionally, after the driving circuit drives the gray-scale brightness of the display pixel circuit of the display light panel to be less than the first gray-scale threshold, it is also configured to adjust the second voltage signal transmitted from the compensation line port to the second transmission end. As a high-level signal, adjust the duration signal transmitted from the light-emitting duration control line port to the third port to a low-level signal; so that the first TFT, the second TFT and the third TFT are in the working state, and the fourth TFT is in the closed state. ; Wherein, the first capacitor is configured to store the voltage of the first node G and the second node S; after a preset period of time, the driving circuit is also configured to gradually reduce the second voltage signal transmitted from the compensation line port to the second transmission end to The low-level signal is such that the voltage difference between the first node G and the second node S reaches the turn-on voltage of the first TFT.

For example, after the above-mentioned first phase is completed, the driving circuit can enter the second phase. In the second phase, the driving circuit can adjust the second voltage signal transmitted from the compensation line port to the second transmission end to a high level signal, and The duration signal transmitted by the light-emitting duration control line port to the third port is adjusted to a low-level signal; so that the first TFT, the second TFT and the third TFT are in the working state, and the fourth TFT is in the closed state. At this time, the compensation line port and the scan line port transmit high-level signals, the first TFT, the second TFT and the third TFT are all turned on, and the voltages V _G = V _Data and V _S = are written on both ends of the first capacitor. _VVref . Among them, V _G = represents the voltage of the first node G, and V _S = represents the voltage of the second node S. After the preset time period, the driving circuit gradually pulls down the second voltage signal transmitted from the compensation line port to the second transmission end to a low level signal. At this time, due to the electro-optical coupling effect, the V _G voltage remains unchanged and V _S is suspended. state, V _S will gradually increase until V _G - V _S = Vth, and then keep V _S stable to complete the internal voltage compensation process. Among them, Vth is the turn-on voltage of the first TFT.

Optionally, when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, the drive circuit is further configured to adjust the first TFT, the second TFT, the third TFT and the fourth TFT to the working state; the drive circuit is also configured to The second voltage signal transmitted from the compensation line port to the second transmission end is readjusted into a high-level signal, so that the voltage at the second node is released.

That is, after the above compensation is completed, the driving circuit can enter the third stage. In the third stage, the driving circuit is further configured to adjust the first TFT, the second TFT, the third TFT and the fourth TFT to the working state. That is, the scan signal transmitted by the drive circuit to the first transmission end through the scan line port is a high-level signal; the duration signal transmitted by the drive circuit to the third port through the light-emitting duration control line port is a high-level signal; the signal transmitted to the third port through the compensation line port is a high-level signal. The second voltage signal transmitted by the second transmission end is a high-level signal. That is to say, the scan line port continues to maintain a high level signal, and the driver circuit scans each row of pixel circuits through the scan port, and writes a voltage of 32-255 grayscale brightness through the voltage data line port to achieve a value greater than the first grayscale threshold. (32-255 gray scale), the display light panel is driven by active address selection driving AM mode.

Optionally, the driving circuit is further configured to readjust the second voltage signal transmitted from the compensation line port to the second transmission end into a high-level signal, so that the voltage at the second node is released. That is, at the end of a display frame, the second voltage signal transmitted from the compensation line port to the second transmission end is readjusted to a high-level signal, so that the pixel circuit can clear the voltage of the second node S, thereby preventing interference with the next frame. The data completes the display of AM data.

Next, taking the above-mentioned first grayscale threshold of 31 as an example, the signal transmitted by the driving circuit within one frame will be described. Please refer to FIG. 3 , which shows a schematic structural diagram of a signal transmitted by a driving circuit within a display frame according to an exemplary embodiment of the present disclosure. In Figure 3, it includes the compensation line ports Scan(0) and Scan(n), the compensation line port Com-Vth and the emission duration control line port Emiting. The signals transmitted by each port within 1 frame are shown in Figure 3. For example, in Figure 3, the first stage within a display frame contains 5 subframes. The display time of the next subframe is twice that of the previous subframe. T represents the display time. The display time of each subframe is T, T*2, T*4, T*8, T*16, the driving circuit drives through the PWM driving method in the first stage (State1) to complete 0-31 gray level brightness (ie, less than or equal to 31 gray level threshold), in the second stage (State2), the second voltage signal transmitted from the compensation line port to the second transmission end completes the compensation process for the pixel circuit, so that the first node and the second node in the pixel circuit The voltage difference between them reaches the turn-on voltage of the first TFT. In the third stage (State3), it is driven through the AM driving method to complete the display of 32-255 gray scale brightness (that is, greater than the 31 gray scale threshold), and in At a preset time t1 of a display frame, the second voltage signal transmitted from the compensation line port to the second transmission end is readjusted to a high-level signal to release the voltage of the second node. The preset time t1 may be preset by developers or operation and maintenance personnel.

In addition, because when the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold, the display light panel is driven by the pulse width modulation PWM method, there is a linear relationship between the display brightness curve and the gray-scale value. When the gray-scale brightness of the pixel circuit When it is greater than the first gray-scale threshold, the display light panel is driven through the AM method. The curve of the display brightness is related to the voltage value of the voltage data line port. The transition between the two gray-scale brightness ranges displayed by the display module is smoother.

Please refer to Figure 4, which shows a method flow chart of a driving method for a display module provided by an exemplary embodiment of the present disclosure. This driving method can be applied to the display module shown in Figure 1 or Figure 2. , In the display module shown in Figure 1 or Figure 2, the display module includes a driving circuit and a display light panel. The display light panel includes at least one pixel circuit. The method is performed by the driving circuit, as shown in Figure 4. This method can include the following steps:

Step 401: When the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold, the driving circuit drives the display light panel through pulse width modulation (PWM).

Step 402: When the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, the driving circuit drives the display light panel through active address driving AM mode.

Optionally, the drive circuit includes a compensation line port, and the compensation line port is electrically connected to the compensation transmission end of the pixel circuit; before step 402, the drive circuit performs voltage compensation on the pixel circuit through the compensation line port, so that the pixel circuit matches the light emission The voltage between the gate and drain of the diode-connected TFT reaches the turn-on voltage.

Taking the grayscale brightness range of 0-255 as an example, the first grayscale threshold is 31. In the brightness range below 31 grayscale, the driver circuit drives the display light panel through pulse width modulation PWM. In the brightness range above 31 grayscale (32-255), the driving circuit drives the display light panel through active address driving AM mode. Optionally, other control steps performed by the driving circuit may refer to the description in the embodiment of FIG. 2 , and will not be described again here.

In one possible implementation, when the driving circuit drives the display light panel through PWM, the scanning signal transmitted to the first transmission terminal through the scanning line port is a high-level signal, and the scanning signal is transmitted to the third transmission terminal through the lighting duration control line port. The duration signal transmitted by the three ports is a high-level signal, and the second voltage signal transmitted to the second transmission end through the compensation line port is a low-level signal, and the first TFT, the second TFT and the fourth TFT are adjusted to the working state. , adjust the third TFT to the closed state. That is, the control steps performed by the driving circuit in this process are equivalent to the description of the first stage in the embodiment of FIG. 2 above, and will not be described again here.

In one possible implementation, the driving circuit performs voltage compensation on the pixel circuit through the compensation line port, so that the voltage between the gate and drain of the TFT connected to the light-emitting diode in the pixel circuit reaches the turn-on voltage as follows: : In the process of the driving circuit driving the display light panel through PWM, after driving the display light panel to display each gray-scale brightness that is less than the first gray-scale threshold, the second voltage signal transmitted from the compensation line port to the second transmission end is adjusted. As a high-level signal, adjust the duration signal transmitted from the light-emitting duration control line port to the third port to a low-level signal; so that the first TFT, the second TFT and the third TFT are in the working state, and the fourth TFT is in the closed state. ; After the preset time period, gradually reduce the second voltage signal transmitted from the compensation line port to the second transmission end to a low level signal, so that the voltage difference between the first node and the second node reaches the turn-on of the first TFT Voltage. That is, the control steps performed by the driving circuit in this process are equivalent to the description of the second stage in the embodiment of FIG. 2. That is, the compensation process of the driving circuit can refer to the second stage of the driving process of the driving circuit in the embodiment of FIG. 2. Here, No further details will be given.

In one possible implementation, when the driving circuit drives the display light panel through PWM, when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, the first TFT, the second TFT, and the third TFT are and the fourth TFT are adjusted to the working state; the second voltage signal transmitted from the compensation line port to the second transmission end is readjusted to a high level signal, so that the voltage at the second node is released. That is, the control steps performed by the driving circuit in this process are equivalent to the description of the third stage in the embodiment of FIG. 2 and will not be described again here.

To sum up, the display module of the present disclosure includes: a driving circuit and a display light panel. The display light panel includes at least one pixel circuit; the driving circuit is electrically connected to each pixel circuit in the display light panel; in the pixel circuit When the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold, the drive circuit drives the display light panel through pulse width modulation PWM; when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, the drive circuit drives the AM method through active address selection Drive display light board. In the present disclosure, the driving circuit in the display module adopts PWM driving mode in the lower gray scale range and AM driving mode in the higher gray scale range, thereby avoiding the problem that the display module is driven in the low gray scale range. The phenomenon of wavelength shift occurs when emitting light, which improves the stability of the display module's light emission.

The following are device embodiments of the present disclosure, which can be configured to execute method embodiments of the present disclosure. For details not disclosed in the device embodiments of the disclosure, please refer to the method embodiments of the disclosure.

Please refer to FIG. 5 , which shows a structural block diagram of a driving device of a display module provided by an exemplary embodiment of the present disclosure. The driving device 500 of the display module can be configured in the display module to perform all or part of the steps performed by the display module in the method provided by the embodiment shown in FIG. 4 . The driving device 500 of the display module includes:

The first driving module 501 is configured to drive the display light panel through pulse width modulation (PWM) when the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold;

The second driving module 502 is configured to drive the display light panel through the active address driving AM mode when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold.

As an optional implementation of the embodiment of the present disclosure, the driving circuit further includes a compensation line port, and the compensation line port is electrically connected to the compensation transmission end of the pixel circuit; the device further includes:

The first compensation module is configured to perform voltage compensation on the pixel circuit through the compensation line port, so that the voltage between the gate and drain of the TFT connected to the light-emitting diode in the pixel circuit reaches a turn-on voltage.

As an optional implementation of the embodiment of the present disclosure, the device further includes:

The first adjustment module is configured such that the scan signal transmitted to the first transmission end through the scan line port is a high level signal, and the duration signal transmitted to the third port through the light emitting duration control line port is a high level signal. level signal, and the second voltage signal transmitted to the second transmission end through the compensation line port is a low-level signal, the first TFT, the second TFT and the fourth TFT are adjusted to the working state, and The third TFT is adjusted to a closed state.

As an optional implementation of the embodiment of the present disclosure, the first compensation module is further configured to:

After driving the display light panel to display each gray-scale brightness smaller than the first gray-scale threshold, adjust the second voltage signal transmitted from the compensation line port to the second transmission end to a high-level signal, and The duration signal transmitted by the lighting duration control line port to the third port is adjusted to a low level signal; so that the first TFT, the second TFT and the third TFT are in a working state, and the third TFT Four TFTs are off;

After a preset period of time, the second voltage signal transmitted from the compensation line port to the second transmission end is gradually reduced to a low level signal, so that the voltage between the first node and the second node The difference reaches the turn-on voltage of the first TFT.

The second adjustment module is configured to adjust the first TFT, the second TFT, the third TFT and the fourth TFT to the working state when the gray scale brightness of the pixel circuit is greater than the first gray scale threshold; The second voltage signal transmitted by the compensation line port to the second transmission end is readjusted into a high-level signal, so that the voltage at the second node is released.

FIG. 6 is a schematic structural diagram of a computer device provided by an exemplary embodiment of the present disclosure. As shown in Figure 6, the computer device 600 includes a central processing unit (Central Processing Unit, CPU) 601, a system memory including a random access memory (Random Access Memory, RAM) 602, and a read only memory (Read Only Memory, ROM) 603. 604, and a system bus 605 connecting the system memory 604 and the central processing unit 601. The computer device 600 also includes a basic transmission/output system (I/O system) 606 that helps transmit information between various devices in the computer, and is configured to store an operating system 612, application programs 613 and other programs. Mass storage device 607 of module 614.

The basic transmission/output system 606 includes a display 606 configured to display information and a transmission device 609 such as a mouse or keyboard configured for a user to transmit information. The display 606 and the transmission device 609 are both connected to the central processing unit 601 through the transmission output controller 610 connected to the system bus 605 . The basic transmission/output system 606 may also include a transmission output controller 610 configured to receive and process transmissions from a variety of other devices such as a keyboard, mouse, or electronic stylus. Similarly, transport output controller 610 also provides output to a display screen, printer, or other type of output device.

The mass storage device 607 is connected to the central processing unit 601 through a mass storage controller (not shown) connected to the system bus 605 . The mass storage device 607 and its associated computer-readable media provide non-volatile storage for the computer device 600 . That is, the mass storage device 607 may include a computer-readable medium (not shown) such as a hard disk or a CD-ROM (Compact Disc Read-Only Memory) drive.

The computer-readable media may include computer storage media and communication media. Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology configured for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media include RAM, ROM, EPROM (Erasable Programmable Read Only Memory, Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory), flash memory or other solid state Storage technology, CD-ROM, DVD (Digital Video Disc, high-density digital video disc) or other optical storage, tape cassettes, tapes, disk storage or other magnetic storage devices. Of course, those skilled in the art will know that the computer storage media is not limited to the above types. The above-mentioned system memory 604 and mass storage device 607 may be collectively referred to as memory.

The computer device 600 may be connected to the Internet or other network devices through the network interface unit 611 connected to the system bus 605 . The memory also includes one or more programs, and the one or more programs are stored in the memory.

Optionally, the above computer device provided by the present disclosure may include at least one display module as shown in the embodiment of FIG. 1 or FIG. 2 .

Optionally, in this disclosure, the drive circuit in the display module can be set on the flexible circuit board FPC and combined with the PCB. Each pixel circuit is in the Micro LED light board. The display process can be referred to Figure 2 or Figure 3. The working principle will not be described again here.

The computer device provided in this embodiment can implement the preview image display method provided in the above method embodiment. The implementation principle and technical effect are similar and will not be described again here.

One or more non-volatile storage media storing computer-readable instructions. When executed by one or more processors, the computer-readable instructions cause one or more processors to perform the following steps:

When the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, the driving circuit drives the display light panel through active address selection driving AM mode.

In one embodiment, when the computer readable instructions are executed by the processor, the following steps are also implemented: the driving circuit further includes a compensation line port, and the compensation line port is electrically connected to the compensation transmission end of the pixel circuit;:

Voltage compensation is performed on the pixel circuit through the compensation line port, so that the voltage between the gate and drain of the TFT connected to the light-emitting diode in the pixel circuit reaches the turn-on voltage.

In one embodiment, the computer readable instructions, when executed by the processor, also perform the following steps::

The scan signal transmitted to the first transmission end through the scan line port is a high-level signal, the duration signal transmitted to the third port through the light-emitting duration control line port is a high-level signal, and the scan signal transmitted to the second transmission end through the compensation line port The second voltage signal is a low-level signal, adjusting the first TFT, the second TFT and the fourth TFT to the working state, and adjusting the third TFT to the off state.

In one embodiment, when the computer-readable instructions are executed by the processor, the following steps are also implemented: performing voltage compensation on the pixel circuit through the compensation line port, so that there is a gap between the gate and the drain of the TFT connected to the light-emitting diode in the pixel circuit. The voltage reaches the turn-on voltage, including:

After the display light panel is driven to display each gray-scale brightness smaller than the first gray-scale threshold, the second voltage signal transmitted from the compensation line port to the second transmission end is adjusted to a high-level signal, and the luminous duration control line port is adjusted to the third The duration signal of port transmission is adjusted to a low-level signal; so that the first TFT, the second TFT and the third TFT are in the working state, and the fourth TFT is in the closed state;

After a preset period of time, the second voltage signal transmitted from the compensation line port to the second transmission end is gradually reduced to a low level signal, so that the voltage difference between the first node and the second node reaches the turn-on voltage of the first TFT .

In one embodiment, when the computer readable instructions are executed by the processor, the following steps are also implemented: when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, converting the first TFT, the second TFT, the third TFT and the fourth TFTs are all adjusted to working status;

The second voltage signal transmitted from the compensation line port to the second transmission end is readjusted into a high-level signal, so that the voltage at the second node is released.

The above is an example of a display module and a computer device disclosed in the embodiments of the present disclosure. Examples are used in this article to illustrate the principles and implementations of the present disclosure. The description of the above embodiments is only configured to help understand the present disclosure. Methods and their core ideas; at the same time, for those of ordinary skill in the art, there will be changes in the implementation and application scope based on the ideas of this disclosure. In summary, the content of this specification should not be understood as an infringement of this disclosure. limits.

Industrial applicability

The display module provided by the present disclosure can be driven by the PWM driving method in the lower gray scale range and the AM driving method in the higher gray scale range, which can avoid the occurrence of wavelength when the display module emits light in the low gray scale range. The phenomenon of offset improves the stability of the display module's light emission and has strong industrial applicability.

Claims

A display module, characterized in that the display module includes a driving circuit and a display light panel, and the display light panel includes at least one pixel circuit;

The driving circuit is electrically connected to each pixel circuit in the display light panel, and the driving circuit is configured to drive the display light panel;

The driving circuit is also configured to drive the display light panel through pulse width modulation (PWM) when the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold;

The driving circuit is further configured to drive the display light panel through active address driving AM mode when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold.
The display module according to claim 1, wherein the pixel circuit includes a first transmission end, a second transmission end, a third transmission end and a fourth transmission end;

The drive circuit includes a scan line port, a voltage data line port, a lighting duration control line port and a compensation line port;

The first transmission end is electrically connected to the scan line port, the second transmission end is electrically connected to the voltage data line port, and the third transmission end is electrically connected to the lighting duration control line port. , the fourth transmission end is electrically connected to the compensation line port;

The scan line port is configured to transmit a scan signal to the first transmission end, the voltage data line port is configured to transmit a first voltage signal to the second transmission end, and the lighting duration control line port is configured to transmit a first voltage signal to the second transmission end. The third transmission end transmits a duration signal, and the compensation line port is configured to transmit a second voltage signal to the fourth transmission end.
The display module according to claim 2, wherein the pixel circuit includes: a first TFT, a second TFT, a third TFT, a fourth TFT, a first capacitor and a light-emitting diode;

The drain of the first TFT is electrically connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is electrically connected to the source of the fourth TFT, and the drain of the fourth TFT is connected to the common ground. Electrically connected; the source of the first TFT is electrically connected to the power supply, the gate of the first TFT is electrically connected to the drain of the second TFT, and the gate of the first TFT is electrically connected to the power supply. A first node is included between the drain electrode of the second TFT, a first end of the first capacitor is electrically connected to the first node, and a second node is included between the drain electrode of the first TFT and the light-emitting diode. node, the second end of the first capacitor is electrically connected to the second node, the second node is also electrically connected to the source of the third TFT, and the drain of the third TFT is connected to the reference The voltage terminals are electrically connected;

The gate of the second TFT is the first transmission end of the pixel circuit, the source of the second TFT is the second transmission end of the pixel circuit, and the gate of the fourth TFT is the pixel The third transmission end of the circuit, the gate electrode of the third TFT is the fourth transmission end of the pixel circuit.
The display module according to claim 3, wherein the driving circuit is further configured to switch the first TFT, the second TFT and the first TFT when the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold. The fourth TFT is adjusted to a working state, and the third TFT is adjusted to a closed state;

Wherein, the scanning signal transmitted by the driving circuit to the first transmission end through the scanning line port is a high-level signal; the driving circuit transmits a duration to the third port through the lighting duration control line port. The signal is a high-level signal; the second voltage signal transmitted by the driving circuit to the second transmission terminal through the compensation line port is a low-level signal.
The display module according to claim 4, characterized in that, after the driving circuit drives the display light panel to display each gray level brightness less than the first gray level threshold, the driving circuit is further configured to switch the compensation line port The second voltage signal transmitted to the second transmission end is adjusted to a high-level signal, and the duration signal transmitted from the lighting duration control line port to the third port is adjusted to a low-level signal; so that the third A TFT, the second TFT and the third TFT are in a working state, and the fourth TFT is in a closed state;

the first capacitor is configured to store voltages of the first node and the second node;

After a preset period of time, the driving circuit is further configured to gradually reduce the second voltage signal transmitted from the compensation line port to the second transmission end to a low level signal, so that the first node is connected to the second transmission end. The voltage difference between the second nodes reaches the turn-on voltage of the first TFT.
The display module according to claim 5, wherein the driving circuit is further configured to switch the first TFT, the second TFT, when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold. The third TFT and the fourth TFT are both adjusted to working status;

The driving circuit is further configured to readjust the second voltage signal transmitted from the compensation line port to the second transmission end into a high-level signal, so that the voltage at the second node is released.
The display module according to any one of claims 1 to 6, characterized in that when the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold, in each display frame of the duration signal sent by the driving circuit Contains N subframes, and the display time of the next subframe is twice that of the previous subframe. N is an integer.
A computer device, characterized in that the computer device includes at least one display module according to any one of claims 1 to 7.
A driving method for a display module, characterized in that the display module includes a driving circuit and a display light panel, the display light panel includes at least one pixel circuit, and the method is executed by the driving circuit, so The methods include:

When the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold, the driving circuit drives the display light panel through pulse width modulation (PWM);

When the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, the driving circuit drives the display light panel in an active address driving AM mode.
The method of claim 9, wherein the driving circuit further includes a compensation line port, and the compensation line port is electrically connected to the compensation transmission end of the pixel circuit; the method further includes:

Voltage compensation is performed on the pixel circuit through the compensation line port, so that the voltage between the gate and drain of the TFT connected to the light-emitting diode in the pixel circuit reaches a turn-on voltage.
The method of claim 10, further comprising:

The scan signal transmitted to the first transmission end through the scan line port is a high-level signal, the duration signal transmitted to the third port through the light-emitting duration control line port is a high-level signal, and through all The second voltage signal transmitted from the compensation line port to the second transmission end is a low-level signal, the first TFT, the second TFT and the fourth TFT are adjusted to the working state, and the third TFT is adjusted to Disabled.
The method according to claim 11, characterized in that the voltage compensation is performed on the pixel circuit through the compensation line port, so that the gate electrode and the drain electrode of the TFT connected to the light-emitting diode in the pixel circuit are The voltage between reaches the turn-on voltage, including:

After driving the display light panel to display each gray-scale brightness smaller than the first gray-scale threshold, adjust the second voltage signal transmitted from the compensation line port to the second transmission end to a high-level signal, and The duration signal transmitted by the lighting duration control line port to the third port is adjusted to a low level signal; so that the first TFT, the second TFT and the third TFT are in a working state, and the third TFT Four TFTs are in the off state;

After a preset period of time, the second voltage signal transmitted from the compensation line port to the second transmission end is gradually reduced to a low level signal, so that the voltage between the first node and the second node The difference reaches the turn-on voltage of the first TFT.
The method according to claim 12, characterized in that, the method further includes:

When the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold, the first TFT, the second TFT, the third TFT and the fourth TFT are all adjusted to the working state;

The second voltage signal transmitted from the compensation line port to the second transmission end is readjusted into a high-level signal, so that the voltage at the second node is released.
A driving device for a display module, characterized in that the display module includes a driving circuit and a display light panel, the display light panel includes at least one pixel circuit, and the device is configured in the driving circuit, The device includes:

A first driving module configured to drive the display light panel through pulse width modulation (PWM) when the gray-scale brightness of the pixel circuit is less than the first gray-scale threshold;

The second driving module is configured to drive the display light panel through the active address driving AM mode when the gray-scale brightness of the pixel circuit is greater than the first gray-scale threshold.
A computer device, including: a memory and one or more processors, with computer-readable instructions stored in the memory; when the computer-readable instructions are executed by the one or more processors, the one or more processors A plurality of processors execute the steps of the display module driving method according to any one of claims 8-13.
One or more non-volatile computer-readable storage media storing computer-readable instructions that, when executed by one or more processors, cause the one or more processors to perform claim 8 -13 The steps of the driving method for the display module described in any one of the above items.