Display module and display control method

Abstract

The invention discloses a display module and a display control method. The display module comprises a display panel, a display driving chip and a voltage compensation circuit. Wherein the structure of the virtual light-emitting device is the same as that of the light-emitting device in the display panel, so that the virtual light-emitting device can accurately reflect the characteristics of the light-emitting device in the display panel. Therefore, after the current supply end provides the standard driving current for the anode of the virtual light-emitting device, the comparison sub-circuit can obtain the first target voltage based on the resistance value of the virtual light-emitting device corresponding to the current temperature of the display module and the standard driving current; the display driving chip performs compensation based on the first compensation signal determined by the first target voltage and the first reference voltage, so that dynamic compensation of the anode voltage of the light emitting device in the display panel can be realized, the brightness requirement in a relatively wide temperature range can be met, the actual use temperature range of the display module is improved, and the display efficiency is improved. And the compensation accuracy can be improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display module and a display control method. Background Technology

[0002] A display module is a module with display functionality.

[0003] Currently, some display modules use organic light-emitting diodes (OLEDs) as their light-emitting devices. OLEDs have many advantages such as active light emission, high brightness, high contrast, ultra-thinness, low power consumption, flexibility, and a wide operating temperature range. Therefore, OLEDs have been widely used in the field of display technology.

[0004] However, the light-emitting devices in the above display module have different luminous efficiencies at different temperatures, resulting in differences in luminous brightness at different temperatures, which can easily lead to poor display effects. Summary of the Invention

[0005] This application provides a display module and a display control method. The technical solution is as follows: According to one aspect of this application, a display module is provided, the display module comprising: a display panel, a display driver chip, and a voltage compensation circuit; The display driver chip is electrically connected to the display panel; The voltage compensation circuit includes: a current supply terminal, a virtual light-emitting device, and a comparator sub-circuit; the structure of the virtual light-emitting device is the same as that of the light-emitting device in the display panel, and the anode of the virtual light-emitting device is electrically connected to the current supply terminal and the input terminal of the comparator sub-circuit, and the output terminal of the comparator sub-circuit is electrically connected to the display driver chip; The comparator circuit is configured to: after providing a standard driving current to the anode of the virtual light-emitting device at the current supply terminal, obtain a first target voltage through the input terminal based on the resistance value of the virtual light-emitting device corresponding to the current temperature of the display module and the standard driving current; and output a first compensation signal to the display driver chip through the output terminal based on the first target voltage and the first reference voltage, so that the display driver chip can output a compensated first driving voltage to the display panel based on the first compensation signal to drive the light-emitting device in the display panel to emit light. Wherein, the first reference voltage is the first driving voltage output by the display driver chip at a specified temperature.

[0006] Optionally, the comparator sub-circuit includes: a first voltage adjustment module; the first voltage adjustment module is configured to: determine the difference between the first target voltage and the first reference voltage, and determine the difference as the first compensation signal.

[0007] Optionally, the first voltage adjustment module includes: a differential amplifier; the non-inverting input terminal of the differential amplifier is used to connect to the first target voltage, the inverting input terminal of the differential amplifier is used to connect to the first reference voltage, and the output terminal of the differential amplifier is used to output the first compensation signal.

[0008] Optionally, the comparator sub-circuit further includes: a second voltage adjustment module; the second voltage module is coupled between the anode of the virtual light-emitting device and the first voltage adjustment module; The second voltage adjustment module is configured to: adjust the first target voltage so that the adjusted first target voltage is within the target voltage range, and output the adjusted first target voltage to the first voltage adjustment module.

[0009] Optionally, the second voltage adjustment module includes: a first clamping diode and a second clamping diode; The positive terminal of the first clamping diode is used to connect to the first target voltage, and the negative terminal of the first clamping diode is used to connect to the highest voltage threshold of the target voltage range. The positive terminal of the second clamping diode is used to connect to the lowest voltage threshold of the target voltage range, and the negative terminal of the second clamping diode is used to connect to the first target voltage.

[0010] Optionally, the anode of the light-emitting device in the display panel is disposed in the same layer and made of the same material as the anode of the virtual light-emitting device; the light-emitting layer of the light-emitting device in the display panel is disposed in the same layer and made of the same material as the light-emitting layer of the virtual light-emitting device; and the cathode of the light-emitting device in the display panel is disposed in the same layer and made of the same material as the cathode of the virtual light-emitting device.

[0011] Optionally, the current supply terminal is electrically connected to the display driver chip; The display module further includes a temperature detection module, which is electrically connected to the display driver chip. The display driver chip is configured to: acquire the current temperature of the display module through the temperature detection module; when the temperature change of the display module is greater than or equal to a first threshold, provide the standard driving current to the anode of the virtual light-emitting device through the current supply terminal, so that the voltage compensation circuit is in working state; when the temperature change of the display module is less than the first threshold, stop providing the standard driving current to the anode of the virtual light-emitting device through the current supply terminal, so that the voltage compensation circuit is in non-working state.

[0012] Optionally, the current supply terminal is electrically connected to the display driver chip; The display driver chip is configured to continuously or periodically provide a standard driving current to the anode of the virtual light-emitting device through the current supply terminal, thereby enabling the voltage compensation circuit to operate in the aforementioned state.

[0013] Optionally, the display panel has: a display area and a non-display area surrounding the display area; the voltage compensation circuit and the display driver chip are distributed in the non-display area.

[0014] On the other hand, a display control method is provided for any of the above-mentioned display modules. The display module includes: a display panel, a display driver chip, and a voltage compensation circuit. The display driver chip is electrically connected to the display panel. The voltage compensation circuit includes: a virtual light-emitting device and a comparator circuit. The structure of the virtual light-emitting device is the same as that of the light-emitting device in the display panel, and the anode of the virtual light-emitting device is electrically connected to the current supply terminal and the input terminal of the comparator circuit, and the output terminal of the comparator circuit is electrically connected to the display driver chip. The method includes: After the comparator circuit provides a standard driving current to the anode of the virtual light-emitting device at the current supply terminal, it obtains a first target voltage through the input terminal based on the resistance value of the virtual light-emitting device corresponding to the current temperature of the display module and the standard driving current. The comparator circuit outputs a first compensation signal to the display driver chip through the output terminal based on the first target voltage and the first reference voltage; wherein, the first reference voltage is the first driving voltage output by the display driver chip at a specified temperature; The display driver chip outputs a compensated first driving voltage to the display panel based on the first compensation signal, so as to drive the light-emitting device in the display panel to emit light.

[0015] The beneficial effects of the technical solutions provided in this application include at least the following: The voltage compensation circuit in the display module includes a current supply terminal, a virtual light-emitting device (LED), and a comparator circuit. Since the structure of the virtual LED is identical to that of the LEDs in the display panel, it accurately reflects the characteristics of the LEDs. Therefore, after providing a standard driving current to the anode of the virtual LED at the current supply terminal, the comparator circuit obtains a first target voltage based on the resistance of the virtual LED at the current temperature of the display module and the standard driving current. The display driver chip then performs compensation based on a first compensation signal determined by the first target voltage and the first reference voltage. This enables dynamic compensation of the anode voltage of the LEDs in the display panel, not only meeting brightness requirements over a wider temperature range and improving the actual operating temperature range of the display module, but also enhancing compensation accuracy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a display module provided in an embodiment of this application; Figure 2 This application provides a schematic diagram of the structure of a voltage compensation circuit and a display driver chip according to an embodiment. Figure 3 This is a schematic diagram of another display module provided in an embodiment of this application; Figure 4 This is a schematic diagram of a voltage compensation circuit provided in an embodiment of this application; Figure 5 This is a flowchart of a display control method provided in an embodiment of this application; Figure 6 This is a flowchart of another display control method provided in an embodiment of this application; Figure 7 This is a flowchart of another display control method provided in the embodiments of this application.

[0018] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0020] In related technologies, the luminous efficiency of light-emitting devices in display modules varies at different temperatures. This is mainly due to the different luminous efficiency of the organic light-emitting layer material in the device at different temperatures. This leads to differences in brightness and poor display performance at different temperatures. Therefore, to achieve the same brightness, the required transverse voltage of the light-emitting device also varies at different temperatures; for example, a higher transverse voltage is required at lower temperatures.

[0021] Currently, some display modules adjust the cathode voltage of the light-emitting devices according to different temperatures to ensure that the brightness of the light-emitting devices remains consistent at different temperatures. However, due to the limitations of the power management chip in the display module, the output cathode voltage is prone to saturation at low temperatures, resulting in the actual brightness failing to reach the target brightness.

[0022] This application provides a display module; please refer to... Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a display module provided in an embodiment of this application. Figure 2 This is a schematic diagram of a voltage compensation circuit and a display driver chip provided in an embodiment of this application. The display module 00 includes: a display panel 10, a display driver chip 20, and a voltage compensation circuit 30.

[0023] The display panel 10 may include a plurality of light-emitting devices 11, and the display panel 10 may be used to display content such as images, text and videos. Figure 1 Taking a light-emitting device 11 as an example, the light-emitting device 11 in the display panel 10 can be an organic light-emitting diode, that is, the display panel 10 can be an OLED display panel, such as a silicon-based OLED display panel. A silicon-based OLED display panel can use a silicon wafer as a substrate, thus integrating some circuit structures (such as driver integrated circuits and pixel circuits) onto the silicon wafer, thereby improving the integration density of the display panel. Furthermore, compared to conventional OLED display panels, silicon-based OLED display panels can have a denser pixel arrangement, thus achieving higher resolution and sharpness.

[0024] For example, the operating temperature range of the display panel 10 can be: The resistance of the material of the light-emitting layer in the light-emitting device 11 varies at different temperatures, from 45℃ to +70℃, which in turn results in different luminous efficiencies.

[0025] The display driver chip 20 is electrically connected to the display panel 10. The display driver chip 20 can control the switching and brightness of each light-emitting device 11 in the display panel 10 according to image data to achieve image display. For example, the display driver chip 20 can control the voltage of the light-emitting device 11, such as the anode voltage and the cathode voltage.

[0026] The voltage compensation circuit 30 includes a current supply terminal 31, a virtual light-emitting device 32, and a comparator circuit 33. Here, the current supply terminal 31 can be used to obtain a standard driving current I1 from a structure outside the voltage compensation circuit 30 and input this standard driving current I1 to the anode of the virtual light-emitting device 32. For example, the standard driving current I1 can be a pre-set constant value that remains constant at different temperatures, and the standard driving current I1 can be the same as the driving current used to drive the light-emitting device 11 in the display panel 10 to emit light.

[0027] The structure of the virtual light-emitting device 32 is the same as that of the light-emitting device 11 in the display panel 10. Therefore, the characteristics of the virtual light-emitting device 32 can reflect the characteristics of the light-emitting device 11 in the display panel 10. For example, the resistance value of the light-emitting device 11 in the display panel 10 at different temperatures can be determined through the virtual light-emitting device 32. The anode of the virtual light-emitting device 32 is electrically connected to the current supply terminal 31 and the input terminal of the comparator circuit 33. The current supply terminal 31 can be used to input a standard driving current I1 to the anode of the virtual light-emitting device 32. After the standard driving current I1 flows through the virtual light-emitting device 32, the anode voltage of the virtual light-emitting device 32 can be determined, and this anode voltage is output to the input terminal of the comparator circuit 33.

[0028] The output of the comparator circuit 33 is electrically connected to the display driver chip 20. Thus, the output of the comparator circuit 33 can be used to feed back an electrical signal to the display driver chip 20, such as a first compensation signal VOF.

[0029] Comparator circuit 33 is configured as follows: After the standard driving current I1 is provided to the anode of the virtual light-emitting device 32 at the current supply terminal 31, the first target voltage V1 is obtained through the input terminal based on the resistance value of the virtual light-emitting device 32 and the standard driving current I1 at the current temperature of the display module 00.

[0030] Here, after the standard driving current I1 is provided to the anode of the virtual light-emitting device 32 at the current supply terminal 31, the anode voltage corresponding to the virtual light-emitting device 32 at the current temperature can be obtained. Since the resistance of the virtual light-emitting device 32 is the same as the resistance of the light-emitting device 11 in the display panel 10, the anode voltage is also the anode voltage required by the light-emitting device 11 in the display panel 10 at the current temperature, which is the first target voltage V1.

[0031] Based on the first target voltage V1 and the first reference voltage V2, the first compensation signal VOF is output to the display driver chip 20 through the output terminal, so that the display driver chip 20 can output the compensated first driving voltage to the display panel 10 based on the first compensation signal VOF, so as to drive the light-emitting device 11 in the display panel 10 to emit light.

[0032] Wherein, the first reference voltage V2 is the first driving voltage output by the display driver chip 20 at a specified temperature. That is, it is the anode voltage required by the light-emitting device 11 in the display panel 10 at the specified temperature. The first reference voltage V2 can be a constant value determined in advance by testing at the specified temperature.

[0033] Here, the comparator circuit 33 can compare the first target voltage V1 and the first reference voltage V2 to determine whether the luminous efficiency of the light-emitting device 11 in the display panel 10 changes at the current temperature, and thus determine whether the anode voltage of the light-emitting device 11 in the display panel 10 needs compensation. When the comparator circuit 33 outputs the first compensation signal VOF to the display driver chip 20, it indicates to the display driver chip 20 that the anode voltage of the light-emitting device 11 in the display panel 10 needs compensation, thereby ensuring that the display driver chip 20 can drive the light-emitting device 11 in the display panel 10 to achieve the same luminous brightness at different temperatures.

[0034] Furthermore, the voltage compensation circuit 30 provided in this embodiment is a circuit structure independent of the display panel 10, and its operation will not affect the normal display of the display panel 10. During the operation of the voltage compensation circuit 30, the virtual light-emitting device 32 can accurately reflect the characteristics of the light-emitting device 11 in the display panel 10, achieving dynamic compensation of the anode voltage. Thus, the accuracy of the first compensation signal VOF determined by the voltage compensation circuit 30 is high, thereby meeting the brightness requirements over a wider temperature range and improving the actual operating temperature range of the display module 00.

[0035] In summary, this application provides a display module in which the voltage compensation circuit includes a current supply terminal, a virtual light-emitting device, and a comparator circuit. Since the structure of the virtual light-emitting device is identical to that of the light-emitting devices in the display panel, the virtual light-emitting device can accurately reflect the characteristics of the light-emitting devices in the display panel. Therefore, after the current supply terminal provides a standard driving current to the anode of the virtual light-emitting device, the comparator circuit can obtain a first target voltage based on the resistance value of the virtual light-emitting device at the current temperature of the display module and the standard driving current. The display driver chip then performs compensation based on a first compensation signal determined by the first target voltage and the first reference voltage. This enables dynamic compensation of the anode voltage of the light-emitting devices in the display panel, which not only meets the brightness requirements over a wider temperature range and improves the actual operating temperature range of the display module, but also enhances the accuracy of compensation.

[0036] The circuit structure of the voltage compensation circuit is described below: In the embodiments of this application, such as Figure 2 As shown, the current supply terminal 31 can serve as the current source for the voltage compensation circuit 30. After current is supplied by the current supply terminal 31, the voltage compensation circuit 30 begins to operate. Therefore, the way the current supply terminal 31 provides current directly determines the operating mode of the voltage compensation circuit 30. Two exemplary embodiments are described below: Please refer to some possible implementation methods. Figure 2 and Figure 3 , Figure 3 This is a schematic diagram of another display module provided in the embodiment of this application. The voltage compensation circuit 30 uses the electrical signal of temperature change as the trigger source, that is, the voltage compensation circuit 30 starts to work when the temperature changes.

[0037] Optionally, the current supply terminal 31 is electrically connected to the display driver chip 20. The voltage compensation circuit 30 includes an operating state and a non-operating state. In the operating state, the voltage compensation circuit 30 acquires a standard drive current I1, and in the non-operating state, it stops acquiring the standard drive current I1. Thus, the display driver chip 20 can control whether the standard drive current I1 is supplied to the current supply terminal 31 to control whether the voltage compensation circuit 30 is in an operating state or a non-operating state.

[0038] The display module 00 also includes a temperature detection module 40, which is electrically connected to the display driver chip 20.

[0039] The display driver chip 20 is configured as follows: The temperature of the display module 00 is obtained through the temperature detection module 40. In this way, the temperature detection module 40 can report the temperature of the display module 00 to the display driver chip 20, so that the display driver chip 20 can determine whether to provide the standard drive current I1 to the current supply terminal 31 based on the temperature of the display module 00. For example, the temperature detection module 40 may include a temperature sensor.

[0040] When the temperature change of the display module 00 is greater than or equal to a first threshold, a standard driving current I1 is supplied to the anode of the virtual light-emitting device 32 through the current supply terminal 31, causing the voltage compensation circuit 30 to operate. Here, when the temperature change is large, the luminous efficiency of the light-emitting device 11 in the display panel 10 fluctuates greatly, which has a significant impact on the brightness. In this case, it is necessary to compensate the anode voltage. For example, the range of the first threshold can be 0.5℃ to 1.5℃, for example, the first threshold can be 0.7℃.

[0041] When the temperature change of the display module 00 is less than the first threshold, the standard drive current I1 is stopped from being supplied to the anode of the virtual light-emitting device 32 through the current supply terminal 31, so that the voltage compensation circuit 30 is in a non-operating state. Here, when the temperature change is small or the temperature does not change, the luminous efficiency fluctuation of the light-emitting device 11 in the display panel 10 is small, resulting in a small change in brightness. At this time, there is no need to compensate the anode voltage, thereby reducing power consumption.

[0042] In this implementation, when the temperature change of the display module 00 indicated by the temperature detection module 40 is greater than or equal to the first threshold, the voltage compensation circuit 30 is in operation, and the resistance of the virtual light-emitting device 32 changes relative to the resistance at the specified temperature. At this time, the first target voltage V1 obtained by the voltage compensation circuit 30 is different from the first reference voltage V2, so the first compensation signal VOF can be output, and then the display driver chip 20 will control the light-emitting device 11 to emit light based on the compensated anode voltage.

[0043] When the temperature change of the display module 00 is less than the first threshold, the voltage compensation circuit 30 is in a non-working state. Therefore, the voltage compensation circuit 30 will not output the first compensation signal VOF, and the display driver chip 20 will still control the light-emitting device 11 to emit light based on the original anode voltage.

[0044] Please refer to some possible implementation methods. Figure 1 and Figure 2 The voltage compensation circuit 30 may not require a trigger source, meaning that the voltage compensation circuit 30 can work continuously or periodically.

[0045] Optionally, the current supply terminal 31 is electrically connected to the display driver chip 20. The voltage compensation circuit 30 includes an operating state. In the operating state, the voltage compensation circuit 30 obtains a standard drive current I1.

[0046] The display driver chip 20 is configured to continuously or periodically supply a standard driving current I1 to the anode of the virtual light-emitting device 32 through the current supply terminal 31, so that the voltage compensation circuit 30 is in working state.

[0047] In this implementation, the voltage compensation circuit 30 can be continuously or periodically in operation. When the current temperature of the display module 00 changes relative to the specified temperature, the resistance of the virtual light-emitting device 32 will change relative to the resistance at the specified temperature. At this time, the first target voltage V1 obtained by the voltage compensation circuit 30 is different from the first reference voltage V2, so the first compensation signal VOF output is not zero. Then, the display driver chip 20 will control the light-emitting device 11 to emit light based on the compensated anode voltage.

[0048] When the current temperature of the display module 00 does not change relative to the specified temperature, the resistance of the virtual light-emitting device 32 does not change relative to the resistance at the specified temperature. At this time, the first target voltage V1 obtained by the voltage compensation circuit 30 is the same as the first reference voltage V2, so the first compensation signal VOF output is zero. As a result, the display driver chip 20 still controls the light-emitting device 11 to emit light based on the original anode voltage.

[0049] It should be noted that in this implementation, a standard driving current I1 can be continuously supplied to the anode of the virtual light-emitting device 32 through the current supply terminal 31, thus enabling real-time feedback on temperature changes. Alternatively, the standard driving current I1 can be supplied to the anode of the virtual light-emitting device 32 periodically, thereby reducing power consumption.

[0050] In the embodiments of this application, please refer to Figure 3 and Figure 4 , Figure 4 This is a schematic diagram of a voltage compensation circuit provided in an embodiment of this application. After the standard driving current I1 provided at the current supply terminal 31 flows through the virtual light-emitting device 32, a first target voltage V1 can be determined. This first target voltage V1 can satisfy: V1 = I1 * R3; Where V1 is the first target voltage, I1 is the standard driving current, and R3 is the resistance of the virtual light-emitting device 32. Since the standard driving current I1 is a constant value, the resistance R1 is different when the display module 00 is at different temperatures, thus obtaining the first target voltage V1 at different temperatures.

[0051] Optionally, the anode of the light-emitting device 11 in the display panel 10 and the anode of the virtual light-emitting device 32 are disposed in the same layer and made of the same material; the light-emitting layer of the light-emitting device 11 in the display panel 10 and the light-emitting layer of the virtual light-emitting device 32 are disposed in the same layer and made of the same material; and the cathode of the light-emitting device 11 in the display panel 10 and the cathode of the virtual light-emitting device 32 are disposed in the same layer and made of the same material. In this way, the light-emitting device 11 and the virtual light-emitting device 32 in the display panel 10 can be manufactured simultaneously through the same process steps, thereby further improving the similarity between the light-emitting device 11 and the virtual light-emitting device 32 in the display panel 10. This ensures a high accuracy of the first target voltage V1 obtained from the virtual light-emitting device 32 at the current temperature, making the first target voltage V1 consistent with the anode voltage required by the light-emitting device 11 in the display panel 10 at the current temperature.

[0052] It should be noted that the light-emitting device 11 and the virtual light-emitting device 32 in the display panel 10 may also include other film layers. Each film layer of the light-emitting device 11 in the display panel 10 corresponds one-to-one with each film layer of the virtual light-emitting device 32, and the corresponding film layers can be set in the same layer and made of the same material.

[0053] Optionally, the display panel 10 has a display area A1 and a non-display area A2 surrounding the display area A1. The voltage compensation circuit 30 and the display driver chip 20 are distributed within the non-display area A2. This avoids the voltage compensation circuit 30 from affecting the display function of the display area A1.

[0054] It should be noted that, Figure 3 The illustration provides an example of the distribution of the voltage compensation circuit 30, but this application does not limit this. For example, the non-display area A2 may include two oppositely arranged first border areas and two oppositely arranged second border areas. The voltage compensation circuit 30 may be distributed within any one of the two first border areas and the two second border areas. Furthermore, the voltage compensation circuit 30 and the display driver chip 20 may be distributed within the same border area or in different border areas.

[0055] Optionally, the display module 00 may further include a covering portion, the orthographic projection of which on the display panel 10 covers the orthographic projection of the virtual light-emitting device 32 on the display panel 10. In this way, after the standard driving current I1 provided by the current supply terminal 31 flows through the virtual light-emitting device 32, the virtual light-emitting device 32 is driven to emit light, and the covering portion can block the light emitted by the virtual light-emitting device 32, avoiding the problem of light leakage at the edges of the display module 00. However, this application is not limited in this respect. For example, when the display module 00 is applied in a display device, the housing or other structures in the display device may also cover the edges of the display module 00 as a covering portion.

[0056] In the embodiments of this application, please refer to Figure 4 The comparator circuit 33 includes a first voltage adjustment module 331. The first voltage adjustment module 331 is configured to determine the difference between a first target voltage V1 and a first reference voltage V2, and to determine the difference as a first compensation signal VOF. Here, the difference reflects the gap between the anode voltage required by the light-emitting device 11 in the display panel 10 and the first reference voltage V2 at the current temperature.

[0057] Therefore, when the difference is not zero, it indicates that the display driver chip 20 needs to compensate for the anode voltage. The display driver chip 20 can compensate for the anode voltage required by the light-emitting device 11 in the display panel 10 based on this difference, for example, by adding the difference to the original anode voltage for compensation. When the difference is zero, it indicates that the display driver chip 20 does not need to compensate for the anode voltage, that is, the display driver chip 20 can maintain the original anode voltage to output to the light-emitting device 11 in the display panel 10.

[0058] Optionally, the first voltage adjustment module 331 includes a differential amplifier 3311. The non-inverting input of the differential amplifier 3311 is used to connect to a first target voltage V1, the inverting input of the differential amplifier 3311 is used to connect to a first reference voltage V2, and the output of the differential amplifier 3311 is used to output a first compensation signal VOF. Here, the differential amplifier 3311 can output the difference between the input first target voltage V1 and the first reference voltage V2 as the first compensation signal VOF.

[0059] For example, with Figure 4 Taking the differential amplifier 3311 as an example, the first target voltage V1 is input to the non-inverting input terminal of the differential amplifier 3311 through the first resistor R1, and the first reference voltage V2 is input to the inverting input terminal of the differential amplifier 3311 through the second resistor R2. A third resistor R3 is connected in parallel between the inverting input terminal and the output terminal of the differential amplifier 3311, and a fourth resistor R4 is connected in parallel between the first resistor R1 and the non-inverting input terminal of the differential amplifier 3311. Here, the resistance of the first resistor R1 is equal to the resistance of the second resistor R2, and the resistance of the third resistor R3 is equal to the resistance of the fourth resistor R4.

[0060] The first compensation signal VOF can satisfy: VOF = R3 / R1(V1-V2); Wherein, VOF is the first compensation signal, V1 is the first target voltage I1, V2 is the first reference voltage V2, R1 is the resistance value of the first resistor, and R3 is the resistance value of the third resistor.

[0061] In this embodiment, the resistance values ​​of the first resistor R1 and the third resistor R3 can be equal, then the first compensation signal VOF is equal to the difference between the first target voltage V1 and the first reference voltage V2. However, this embodiment is not limited to this. In some possible implementations, the difference between the first target voltage V1 and the first reference voltage V2 can be amplified or reduced by controlling the resistance values ​​of the first resistor R1 and the third resistor R3. For example, by setting the resistance value of the third resistor R3 to be greater than the resistance value of the first resistor R1, the difference can be amplified, thereby improving the accuracy and stability of the output first compensation signal VOF.

[0062] In this embodiment, the comparator sub-circuit 33 further includes a second voltage adjustment module 332. The second voltage module is coupled between the anode of the virtual light-emitting device 32 and the first voltage adjustment module 331. The second voltage adjustment module 332 is configured to adjust the first target voltage V1 so that the adjusted first target voltage V1 is within a target voltage range, and output the adjusted first target voltage V1' to the first voltage adjustment module 331. Here, the second voltage adjustment module 332 can clamp the first target voltage V1 within the target voltage range before the first voltage adjustment module 331, preventing the first target voltage V1 from being too large or too small, and ensuring that the first target voltage V1 can meet the output capability of the power management chip in the display module 00.

[0063] Optionally, the second voltage adjustment module 332 includes: a first clamping diode 3321 and a second clamping diode 3322.

[0064] The anode of the first clamping diode 3321 is used to connect to the first target voltage V1, and the cathode of the first clamping diode 3321 is used to connect to the highest voltage threshold V4 of the target voltage range. Thus, when the first target voltage V1 is greater than the highest voltage threshold V4, the first target voltage V1 will be clamped to the highest voltage threshold V4, meaning the adjusted first target voltage V1' is equal to the highest voltage threshold V4. When the first target voltage V1 is within the target voltage range, the adjusted first target voltage V1' is equal to the original first target voltage V1.

[0065] The anode of the second clamping diode 3322 is used to connect to the lowest voltage threshold V3 of the target voltage range, and the cathode of the second clamping diode 3322 is used to connect to the first target voltage V1. Thus, when the first target voltage V1 is less than the lowest voltage threshold V3, the first target voltage V1 will be clamped to the lowest voltage threshold V3, meaning the adjusted first target voltage V1' is equal to the lowest voltage threshold V3. When the first target voltage V1 is within the target voltage range, the adjusted first target voltage V1' is equal to the original first target voltage V1.

[0066] In this embodiment, the display driver chip 20 can compensate the anode voltage based on the first compensation signal output by the voltage compensation circuit 30, for example, by superimposing the difference onto the original anode voltage for compensation. However, this application is not limited to this. The display driver chip 20 includes a module for compensating the anode voltage and a module for compensating the cathode voltage. In this way, the display driver chip 20 can simultaneously compensate for the anode voltage and the cathode voltage to improve the adaptability to the output capability of the power management chip.

[0067] In this case, the display driver chip 20 can determine the required voltage adjustment amount for the light-emitting device 11 in the display panel 10 based on the first compensation signal, and allocate the voltage adjustment amount to the module for compensating the anode voltage and the module for compensating the cathode voltage. For example, the allocation ratio can be 1:1, thereby achieving the effect of balancing the output capability of the power management chip to improve stability and compensation effect. However, the embodiments of this application do not limit the allocation ratio.

[0068] In summary, this application provides a display module in which the voltage compensation circuit includes a current supply terminal, a virtual light-emitting device, and a comparator circuit. Since the structure of the virtual light-emitting device is identical to that of the light-emitting devices in the display panel, the virtual light-emitting device can accurately reflect the characteristics of the light-emitting devices in the display panel. Therefore, after the current supply terminal provides a standard driving current to the anode of the virtual light-emitting device, the comparator circuit can obtain a first target voltage based on the resistance value of the virtual light-emitting device at the current temperature of the display module and the standard driving current. The display driver chip then performs compensation based on a first compensation signal determined by the first target voltage and the first reference voltage. This enables dynamic compensation of the anode voltage of the light-emitting devices in the display panel, which not only meets the brightness requirements over a wider temperature range and improves the actual operating temperature range of the display module, but also enhances the accuracy of compensation.

[0069] On the other hand, embodiments of this application provide a display control method, please refer to... Figure 5 , Figure 5 This is a flowchart of a display control method provided in an embodiment of this application. The display control method is used in any of the aforementioned display modules. The display module includes: a display panel, a display driver chip, and a voltage compensation circuit. The display driver chip is electrically connected to the display panel. The voltage compensation circuit includes: a virtual light-emitting device and a comparator circuit. The structure of the virtual light-emitting device is the same as that of the light-emitting device in the display panel, and the anode of the virtual light-emitting device is electrically connected to the current supply terminal and the input terminal of the comparator circuit, while the output terminal of the comparator circuit is electrically connected to the driver chip. The method includes: Step 501: After the comparator circuit provides a standard driving current to the anode of the virtual light-emitting device at the current supply terminal, it obtains the first target voltage through the input terminal based on the resistance value of the virtual light-emitting device and the standard driving current at the current temperature of the display module.

[0070] Step 502: The comparator circuit outputs a first compensation signal to the display driver chip through its output terminal based on the first target voltage and the first reference voltage.

[0071] The first reference voltage is the first driving voltage output by the display driver chip at a specified temperature.

[0072] Step 503: The display driver chip outputs a compensated first driving voltage to the display panel based on the first compensation signal, so as to drive the light-emitting device in the display panel to emit light.

[0073] In summary, this application provides a display control method in which the voltage compensation circuit in the display module includes a current supply terminal, a virtual light-emitting device, and a comparator circuit. Since the structure of the virtual light-emitting device is identical to that of the light-emitting devices in the display panel, the virtual light-emitting device can accurately reflect the characteristics of the light-emitting devices in the display panel. Therefore, after the current supply terminal provides a standard driving current to the anode of the virtual light-emitting device, the comparator circuit can obtain a first target voltage based on the resistance value of the virtual light-emitting device at the current temperature of the display module and the standard driving current. The display driver chip then performs compensation based on a first compensation signal determined by the first target voltage and the first reference voltage. This enables dynamic compensation of the anode voltage of the light-emitting devices in the display panel, which not only meets the brightness requirements over a wider temperature range and improves the actual operating temperature range of the display module, but also enhances the accuracy of compensation.

[0074] This application also provides another display control method, please refer to... Figure 6 , Figure 6 This is a flowchart of another display control method provided in an embodiment of this application. This display control method can be used for Figure 3 The method, as shown in the display module, includes: Step 601: Obtain the current temperature of the display module through the temperature detection module.

[0075] like Figure 2 and Figure 3 As shown, the display module 00 further includes a temperature detection module 40, which is electrically connected to the display driver chip 20. The temperature detection module 40 can feed back the temperature of the display module 00 to the display driver chip 20, so that the display driver chip 20 can determine whether to provide a standard drive current I1 to the current supply terminal 31 based on the temperature of the display module 00. For example, the temperature detection module 40 may include a temperature sensor.

[0076] Step 602: The display driver chip determines whether the temperature change of the display module is greater than or equal to the first threshold.

[0077] When the temperature change of the display module is greater than or equal to the first threshold, step 603 can be executed. When the temperature change of the display module is less than the first threshold, step 607 can be executed. For example, the range of the first threshold can be 0.5℃ to 1.5℃, for example, the first threshold can be 0.7℃.

[0078] Step 603: The display driver chip provides a standard drive current to the anode of the virtual light-emitting device through the current supply terminal, so that the voltage compensation circuit is in working state.

[0079] like Figure 2 and Figure 3 As shown, when the temperature change of the display module is greater than or equal to the first threshold, the temperature change is large, the luminous efficiency of the light-emitting device 11 in the display panel 10 fluctuates greatly, and the brightness is greatly affected. At this time, it is necessary to compensate the anode voltage.

[0080] Step 604: After the comparator circuit provides a standard driving current to the anode of the virtual light-emitting device at the current supply terminal, it obtains the first target voltage through the input terminal based on the resistance value of the virtual light-emitting device and the standard driving current corresponding to the current temperature of the display module.

[0081] like Figure 3 and Figure 4 As shown, after the standard driving current I1 provided by the current supply terminal 31 flows through the virtual light-emitting device 32, the first target voltage V1 can be determined.

[0082] Step 605: The comparator circuit outputs a first compensation signal to the display driver chip through its output terminal based on the first target voltage and the first reference voltage.

[0083] like Figure 3 and Figure 4 As shown, the comparator circuit can determine the difference between the first target voltage V1 and the first reference voltage V2, and use the difference as the first compensation signal VOF.

[0084] Step 606: The display driver chip outputs a compensated first driving voltage to the display panel based on the first compensation signal, so as to drive the light-emitting device in the display panel to emit light.

[0085] like Figure 2 and Figure 3As shown, the display driver chip 20 can compensate for the first driving voltage required by the light-emitting device 11 in the display panel 10, i.e., the anode voltage, based on the first compensation signal VOF. For example, the difference can be superimposed on the original anode voltage for compensation.

[0086] Step 607: The display driver chip stops supplying the standard drive current to the anode of the virtual light-emitting device through the current supply terminal, so that the voltage compensation circuit is in a non-operating state.

[0087] like Figure 2 and Figure 3 As shown, when the temperature change of the display module is less than the first threshold, the luminous efficiency of the light-emitting device 11 in the display panel 10 fluctuates less when the temperature change is small or not at all, resulting in a smaller change in brightness. At this time, there is no need to compensate for the anode voltage, thereby reducing power consumption.

[0088] Step 608: The display driver chip outputs the original first driving voltage to the display panel to drive the light-emitting devices in the display panel to emit light.

[0089] like Figure 2 and Figure 3 As shown, when the voltage compensation circuit is in a non-working state, the voltage compensation circuit 30 will not output the first compensation signal VOF, and the display driver chip 20 will still control the light-emitting device 11 to emit light based on the original anode voltage.

[0090] This application also provides another display control method, please refer to... Figure 7 , Figure 7 This is a flowchart of another display control method provided in the embodiments of this application. This display control method can be used for Figure 1 The method, as shown in the display module, includes: Step 701: After the comparator circuit provides a standard driving current to the anode of the virtual light-emitting device at the current supply terminal, it obtains the first target voltage through the input terminal based on the resistance value of the virtual light-emitting device and the standard driving current at the current temperature of the display module.

[0091] like Figure 1 and Figure 2 As shown, in this embodiment of the application, a standard drive current I1 can be provided to the anode of the virtual light-emitting device 32 through the current supply terminal 31, so that the voltage compensation circuit 30 is always in an operational state. Alternatively, the standard drive current I1 can be provided to the anode of the virtual light-emitting device 32 periodically to reduce power consumption.

[0092] Step 702: The comparator circuit outputs a first compensation signal to the display driver chip through its output terminal based on the first target voltage and the first reference voltage.

[0093] like Figure 1 and Figure 2 As shown, when the current temperature of the display module 00 changes relative to the specified temperature, the resistance of the virtual light-emitting device 32 will change relative to the resistance at the specified temperature. At this time, the first target voltage V1 obtained by the voltage compensation circuit 30 is different from the first reference voltage V2, so the output first compensation signal VOF is not zero. Then, the display driver chip 20 will control the light-emitting device 11 to emit light based on the compensated anode voltage.

[0094] When the current temperature of the display module 00 does not change relative to the specified temperature, the resistance of the virtual light-emitting device 32 does not change relative to the resistance at the specified temperature. At this time, the first target voltage V1 obtained by the voltage compensation circuit 30 is the same as the first reference voltage V2, so the first compensation signal VOF output is zero. As a result, the display driver chip 20 still controls the light-emitting device 11 to emit light based on the original anode voltage.

[0095] Step 703: The display driver chip determines whether the first compensation signal is zero.

[0096] When the first compensation signal is not zero, execute step 704; when the first compensation signal is zero, execute step 705.

[0097] Step 704: The display driver chip outputs a compensated first driving voltage to the display panel based on the first compensation signal, so as to drive the light-emitting device in the display panel to emit light.

[0098] like Figure 1 and Figure 2 As shown, when the first compensation signal is not zero, the display driver chip 20 can compensate for the first driving voltage required by the light-emitting device 11 in the display panel 10, i.e., the anode voltage, based on the first compensation signal VOF. For example, the difference can be superimposed on the original anode voltage for compensation.

[0099] Step 705: The display driver chip outputs the original first driving voltage to the display panel to drive the light-emitting devices in the display panel to emit light.

[0100] like Figure 1 and Figure 2 As shown, when the first compensation signal is zero, it can be concluded that the temperature has not changed, and the display driver chip 20 still controls the light-emitting device 11 to emit light based on the original anode voltage.

[0101] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0102] In this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" means two or more, unless otherwise expressly defined.

[0103] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A display module, characterized in that, The display module includes: a display panel, a display driver chip, and a voltage compensation circuit; The display driver chip is electrically connected to the display panel; The voltage compensation circuit includes: a current supply terminal, a virtual light-emitting device, and a comparator sub-circuit; the structure of the virtual light-emitting device is the same as that of the light-emitting device in the display panel, and the anode of the virtual light-emitting device is electrically connected to the current supply terminal and the input terminal of the comparator sub-circuit, and the output terminal of the comparator sub-circuit is electrically connected to the display driver chip; The comparator circuit is configured to: after providing a standard driving current to the anode of the virtual light-emitting device at the current supply terminal, obtain a first target voltage through the input terminal based on the resistance value of the virtual light-emitting device corresponding to the current temperature of the display module and the standard driving current; and output a first compensation signal to the display driver chip through the output terminal based on the first target voltage and the first reference voltage, so that the display driver chip can output a compensated first driving voltage to the display panel based on the first compensation signal to drive the light-emitting device in the display panel to emit light. Wherein, the first reference voltage is the first driving voltage output by the display driver chip at a specified temperature.

2. The display module according to claim 1, characterized in that, The comparator sub-circuit includes: a first voltage adjustment module; the first voltage adjustment module is configured to: determine the difference between the first target voltage and the first reference voltage, and determine the difference as the first compensation signal.

3. The display module according to claim 2, characterized in that, The first voltage adjustment module includes: a differential amplifier; the non-inverting input terminal of the differential amplifier is used to connect to the first target voltage, the inverting input terminal of the differential amplifier is used to connect to the first reference voltage, and the output terminal of the differential amplifier is used to output the first compensation signal.

4. The display module according to claim 2, characterized in that, The comparator sub-circuit further includes: a second voltage adjustment module; the second voltage module is coupled between the anode of the virtual light-emitting device and the first voltage adjustment module; The second voltage adjustment module is configured to: adjust the first target voltage so that the adjusted first target voltage is within the target voltage range, and output the adjusted first target voltage to the first voltage adjustment module.

5. The display module according to claim 4, characterized in that, The second voltage adjustment module includes: a first clamping diode and a second clamping diode; The positive terminal of the first clamping diode is used to connect to the first target voltage, and the negative terminal of the first clamping diode is used to connect to the highest voltage threshold of the target voltage range. The positive terminal of the second clamping diode is used to connect to the lowest voltage threshold of the target voltage range, and the negative terminal of the second clamping diode is used to connect to the first target voltage.

6. The display module according to any one of claims 1-5, characterized in that, The anode of the light-emitting device in the display panel is disposed in the same layer and made of the same material as the anode of the virtual light-emitting device. The light-emitting layer of the light-emitting device in the display panel is disposed in the same layer and made of the same material as the light-emitting layer of the virtual light-emitting device. The cathode of the light-emitting device in the display panel is disposed in the same layer and made of the same material as the cathode of the virtual light-emitting device.

7. The display module according to any one of claims 1-5, characterized in that, The current supply terminal is electrically connected to the display driver chip; The display module further includes a temperature detection module, which is electrically connected to the display driver chip. The display driver chip is configured to: acquire the current temperature of the display module through the temperature detection module; when the temperature change of the display module is greater than or equal to a first threshold, provide the standard driving current to the anode of the virtual light-emitting device through the current supply terminal, so that the voltage compensation circuit is in working state; when the temperature change of the display module is less than the first threshold, stop providing the standard driving current to the anode of the virtual light-emitting device through the current supply terminal, so that the voltage compensation circuit is in non-working state.

8. The display module according to any one of claims 1-5, characterized in that, The current supply terminal is electrically connected to the display driver chip; The display driver chip is configured to continuously or periodically provide a standard driving current to the anode of the virtual light-emitting device through the current supply terminal, thereby enabling the voltage compensation circuit to operate in the aforementioned state.

9. The display module according to any one of claims 1-5, characterized in that, The display panel has: a display area and a non-display area surrounding the display area; the voltage compensation circuit and the display driver chip are distributed in the non-display area.

10. A display control method, characterized in that, The display control method is used in the display module according to any one of claims 1-9, the display module comprising: a display panel, a display driver chip, and a voltage compensation circuit; the display driver chip is electrically connected to the display panel; the voltage compensation circuit comprises: a virtual light-emitting device and a comparator circuit; the structure of the virtual light-emitting device is the same as that of the light-emitting device in the display panel, and the anode of the virtual light-emitting device is electrically connected to the current supply terminal and the input terminal of the comparator circuit, and the output terminal of the comparator circuit is electrically connected to the display driver chip; The method includes: After the comparator circuit provides a standard driving current to the anode of the virtual light-emitting device at the current supply terminal, it obtains a first target voltage through the input terminal based on the resistance value of the virtual light-emitting device corresponding to the current temperature of the display module and the standard driving current. The comparator circuit outputs a first compensation signal to the display driver chip through the output terminal based on the first target voltage and the first reference voltage; wherein, the first reference voltage is the first driving voltage output by the display driver chip at a specified temperature; The display driver chip outputs a compensated first driving voltage to the display panel based on the first compensation signal, so as to drive the light-emitting device in the display panel to emit light.

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