Display panel and electronic device

Abstract

The application provides a display panel and an electronic device. The display panel comprises: at least two power management modules, different power management modules are configured to have driving voltages with different voltage levels; a gray scale detection module, the gray scale detection module is used to determine the gray scale level of a required display image and output a corresponding control signal; and an output selection module, a voltage input port of the output selection module is connected with an output port of at least two power management modules respectively, and the output selection module is used to select the driving voltage provided by one of the power management modules and output to a pixel driving circuit according to the control signal output by the gray scale detection module. In this way, the driving voltage with different voltage levels can be output for different gray scale levels to supply the pixel driving circuit, so as to offset the problem of nonlinearity of high and low gray scale driving voltage variation caused by circuit impedance, and reduce the risk of gama offset or color deviation of the display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a display panel and an electronic device. Background Technology

[0002] In some display panels, to display different brightness levels, the current supplied to the luminous pixels needs to be selectively adjusted. Typically, a combination of pulse width modulation (PWM) and pulse amplitude modulation (PAM) is used. This involves controlling the output voltage, which in turn controls the transistor's on / off state, thus converting the voltage into current. However, in this type of solution, the current variation between high and low grayscale levels can be non-linear due to circuit impedance, leading to problems such as gamma shift or color distortion in the display panel. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings in the prior art, the purpose of this application is to provide a display panel, the display panel comprising:

[0004] At least two power management modules, the different power management modules being configured to have drive voltages with different output voltage levels;

[0005] A grayscale detection module is used to determine the grayscale level of the image to be displayed and output the corresponding control signal.

[0006] An output selection module is provided, wherein the voltage input port of the output selection module is connected to the output ports of at least two of the power management modules, and the control terminal of the output selection module is connected to the output port of the grayscale detection module. The output selection module is used to select one of the driving voltages provided by the power management module to be output to the pixel driving circuit according to the control signal output by the grayscale detection module.

[0007] In one possible implementation, the output selection module is configured as follows:

[0008] For control signals corresponding to lower gray levels, select a drive voltage with a higher voltage level for output.

[0009] For control signals corresponding to higher gray levels, select a driving voltage with a lower voltage level for output.

[0010] In one possible implementation, each of the power management modules includes at least three voltage output ports, and at least two of the voltage output ports correspond to at least three different colors of light-emitting pixels, respectively.

[0011] At least one of the power management modules is configured to output different voltage levels at the voltage output ports corresponding to at least two different colored light-emitting pixels.

[0012] In one possible implementation, in at least two of the power management modules, the voltage level ratio corresponding to the first color emitting pixel is a first ratio, the voltage level ratio corresponding to the second color emitting pixel is a second ratio, and the first ratio is not equal to the second ratio.

[0013] In one possible implementation, the power management module is configured to operate according to a preset proportional parameter. The input voltage will be used. Converted into driving voltage of the corresponding voltage level Wherein, the driving voltage With the aforementioned proportional parameter Positive correlation;

[0014] Preferably, the power management module is configured to operate according to a preset proportional parameter. and fine-tuning parameters According to the input voltage Converted into driving voltage of the corresponding voltage level ;in, .

[0015] In one possible implementation, within the same power management module, the proportional parameters corresponding to at least two different colored emitting pixels... and / or fine-tuning parameters different.

[0016] In one possible implementation, the display panel further includes a pulse width modulation module and a pulse amplitude modulation module;

[0017] The pulse amplitude modulation module is used to generate an output signal with a corresponding pulse amplitude according to the driving voltage provided by the output selection module;

[0018] The pulse width modulation module is used to provide an output signal with a corresponding pulse width according to the grayscale of the image to be displayed;

[0019] The pixel driving circuit is used to generate pulse signals with corresponding amplitude and width based on the signals output by the pulse amplitude modulation module and the pulse width modulation module to drive the pixel to emit light.

[0020] In one possible implementation, the display panel further includes a power supply module, the output port of which is connected to the input port of each of the power management modules, and the power supply module is used to provide power to each of the power management modules.

[0021] In one possible implementation, the display panel includes a timing controller TCON, which includes the grayscale detection module.

[0022] This application also provides an electronic device, which includes the display panel provided in this application.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] This application provides a display panel and electronic device. By setting at least two power management modules corresponding to different grayscale levels, and having an output selection module selectively output the driving voltage provided by one of the power management modules according to the grayscale level, it is possible to supply different driving voltage levels to the pixel driving circuit for different grayscale levels. In this way, the problem of nonlinearity in the high and low grayscale driving voltage changes caused by circuit impedance is offset, and the risk of gamma shift or color shift problems in the display panel is reduced. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a partial circuit diagram of a display panel in the prior art;

[0027] Figure 2 This is a current waveform diagram of a pixel driving circuit in the prior art;

[0028] Figure 3 This is one of the partial circuit diagrams of the display panel provided in the embodiments of this application;

[0029] Figure 4 This is a second partial circuit diagram of the display panel provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the compensated pulse waveform provided in an embodiment of this application;

[0031] Figure 6 This is the third partial circuit diagram of the display panel provided in the embodiments of this application.

[0032] Icons: 110 - Power Management Module; 120 - Gray Scale Detection Module; 130 - Output Selection Module; 140 - Pulse Amplitude Modulation Module; 150 - Pulse Width Modulation Module; 160 - Pixel Driving Circuit. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] It should be noted that, where there is no conflict, different features in the embodiments of this application can be combined with each other.

[0038] Please refer to Figure 1In some existing display panels, a pulse amplitude modulation module 940 and a pulse width modulation module 950 are used to control the current obtained by the pixel driving circuit 960. However, in this type of scheme, the pulse amplitude modulation module 940 always draws power from a power management module 910. Therefore, regardless of the grayscale image displayed on the display panel, the pulse amplitude modulation module 940 outputs the same voltage. Consequently, the pixel driving circuit 960 can only generate currents with different pulse widths to drive the pixels to emit light based on the signals provided by the pulse amplitude modulation module 940 and the pulse width modulation module 950. However, there is always a certain impedance in the various circuits in the display panel, causing the current change between high and low grayscale levels to be non-linear.

[0039] For example, please refer to Figure 2 Ideally, the pulse waveform of the driving current should be rectangular, and the effective current (equivalent to the pulse area) should change linearly with the pulse width (equivalent to the length of the lower base of the pulse waveform).

[0040] However, circuits always have a certain impedance. The current supplied by the pixel driving circuit 960 from the signals obtained from the pulse amplitude modulation module 940 and the pulse width modulation module 950 has a certain slope on the rising and falling edges of the pulse, and the pulse waveform is not rectangular. Specifically, the current value within the pulse time corresponding to the rising and falling edges does not reach the expected amplitude, and there are certain invalid parts (such as...). Figure 2 The area shown by the dashed line is the region of the pulse. When the pulse width is narrow (such as when displaying a low grayscale image), the invalid portion corresponding to the rising and falling edges accounts for a relatively large proportion of the entire pulse time; when the pulse width is large (such as when displaying a high grayscale image), the invalid portion corresponding to the rising and falling edges accounts for a relatively small proportion of the entire pulse time. This results in the effective current (equivalent to the pulse area) changing non-linearly with the pulse width (equivalent to the length of the lower edge of the pulse waveform) between high and low grayscale levels.

[0041] The non-linear change in current between high and low grayscale levels will cause the brightness change of the display panel between high and low grayscale levels to also be non-linear, which means that the display panel will have gamma offset.

[0042] In view of this, this embodiment provides a solution that can improve the above problems. The solution provided in this embodiment will be described in detail below.

[0043] Please see Figure 3 , Figure 3 This is a circuit diagram of a display panel provided in this embodiment. The display panel may include at least two power management modules 110, a grayscale detection module 120, and an output selection module 130.

[0044] In at least two power management modules 110, different power management modules 110 are configured to have drive voltages with different output voltage levels. The different power management modules 110 can correspond to different grayscale levels.

[0045] The grayscale detection module 120 is used to determine the grayscale level of the image to be displayed and output the corresponding control signal. One output port of the grayscale detection module 120 can be connected to the output selection module 130, thereby sending the control signal to the output selection module 130.

[0046] The voltage input port of the output selection module 130 is connected to the output ports of at least two of the power management modules 110, and the control terminal of the output selection module 130 is connected to the output port of the grayscale detection module 120. The output selection module 130 is used to select and output one of the driving voltages provided by the power management module 110 to the pixel driving circuit 160 according to the control signal output by the grayscale detection module 120.

[0047] Based on the above design, in the display panel provided in this embodiment, at least two power management modules 110 can provide at least two different voltage levels of driving voltage to the output selection module 130. The grayscale detection module 120 can send a corresponding control signal to the output selection module 130 according to the grayscale level of the displayed image. Based on this, the output selection module 130 can select one of the at least two different voltage levels of driving voltage provided by the power management module 110 for output according to the control signal. Thus, the driving voltage output by the output selection module 130, in conjunction with other pulse amplitude modulation-related circuits or modules, can modulate both the pulse width and pulse amplitude of the voltage signal obtained by the pixel driving circuit 160, thereby eliminating the nonlinearity problem of high and low grayscale driving voltage changes caused by circuit impedance and reducing the risk of gamma offset problems in the display panel.

[0048] Furthermore, in one possible implementation, please refer to... Figure 4 In this embodiment, the display panel further includes a pulse width modulation module 150 and a pulse amplitude modulation module 140.

[0049] The input port of the pulse amplitude modulation module 140 is connected to the output selection module 130, and the output port of the pulse amplitude modulation module 140 is connected to the pixel driving circuit 160. The pulse amplitude modulation module 140 is used to generate an output signal with a corresponding pulse amplitude according to the driving voltage provided by the output selection module 130.

[0050] The output port of the pulse width modulation module 150 is connected to the pixel driving circuit 160. The pulse width modulation module 150 is used to provide an output signal with a corresponding pulse width according to the grayscale of the image to be displayed.

[0051] The pixel driving circuit 160 is used to generate pulse signals with corresponding amplitude and width according to the signals output by the pulse amplitude modulation module 140 and the pulse width modulation module 150 to drive the pixel to emit light.

[0052] Thus, the pulse width modulation module 150 and the pulse amplitude modulation module 140 work together to modulate both the pulse width and pulse amplitude of the voltage signal obtained by the pixel driving circuit 160, thereby eliminating the nonlinearity of the high and low grayscale driving voltage changes caused by circuit impedance and reducing the risk of gamma offset problems in the display panel.

[0053] Please refer to this again. Figure 2 When the pulse amplitude is the same, the pulse width corresponding to the lower gray level is narrower and the pulse width corresponding to the higher gray level is wider. Among them, the invalid part of the pulse rising edge and falling edge accounts for a relatively larger proportion in the pulse corresponding to the lower gray level.

[0054] Therefore, in one possible implementation, the output selection module 130 can be configured to select a higher voltage level drive voltage output for control signals corresponding to lower gray levels, and select a lower voltage level drive voltage output for control signals corresponding to higher gray levels.

[0055] In this way, the pulse amplitude when displaying low grayscale can be greater than the pulse amplitude when displaying high grayscale, thereby canceling out the influence of the invalid parts in the rising and falling edges of the pulse, making the current change between low and high grayscale more linear.

[0056] For example, please refer to Figure 5 The solution provided in this embodiment can compensate for the pulse amplitude, so that after compensation, the pulse amplitude of the low gray level current is greater than that of the high gray level current, thereby offsetting the influence of the invalid part in the rising and falling edges of the pulse on the area of ​​the pulse waveform, making the area change of the pulse waveform more linear than the change of the bottom length of the pulse waveform, that is, making the change of the driving current value between the high gray level and the low gray level more linear.

[0057] In some scenarios, due to the different materials used in the luminescent layers of pixels of different colors, there are impedance differences between these pixels. Therefore, in one possible implementation of this embodiment, please refer to... Figure 6Each power management module 110 includes at least three voltage output ports, with at least two of the voltage output ports corresponding to at least three different colored light-emitting pixels. At least one power management module 110 is configured to output different voltage levels to the voltage output ports corresponding to at least two different colored light-emitting pixels. Thus, the same power management module 110 can output different voltage levels for different colors, thereby canceling out color shifts caused by impedance between different colored pixels.

[0058] In one possible implementation, in at least two of the power management modules 110, the voltage level ratio corresponding to the first color emitting pixel is a first ratio, and the voltage level ratio corresponding to the second color emitting pixel is a second ratio, wherein the first ratio is not equal to the second ratio.

[0059] For example, the voltage output by the power management module 110 corresponding to a lower grayscale for the red emitting pixel is... For the voltage output of green emitting pixels The voltage output for the blue emitting pixel is A higher grayscale corresponding to the power management module 110 outputs a voltage for the red emitting pixel as follows: For the voltage output of green emitting pixels The voltage output for the blue emitting pixel is . , and Of these three ratios, at least two are not equal.

[0060] In this way, different voltage level change rates can be configured for different colors in high and low gray levels, thereby offsetting the color shift caused by the different impedance change rates of light-emitting pixels of different colors at different gray levels due to different materials.

[0061] In one possible implementation, the power management module 110 is configured to operate according to a preset proportional parameter. The input voltage will be used. Converted into driving voltage of the corresponding voltage level Wherein, the driving voltage With the aforementioned proportional parameter They are positively correlated.

[0062] Preferably, the power management module 110 is configured to operate according to a preset proportional parameter. and fine-tuning parameters Input voltage Converted into driving voltage of the corresponding voltage level ;in, .

[0063] Thus, by configuring different proportional parameters in the power management module 110 and fine-tuning parameters Different voltage management modules can output different levels of drive voltage.

[0064] For example, in the same power management module 110, the proportional parameters corresponding to at least two different colored light-emitting pixels. and / or fine-tuning parameters different.

[0065] In one possible implementation, the display panel may further include a power supply module, the output port of which is connected to the input port of each of the power management modules 110. The power supply module provides power to each of the power management modules 110. That is, each power management module can be connected to the same power supply module, and the configuration of each power management module can adjust the input voltage to output different voltage levels of drive voltage.

[0066] In one possible implementation, the display panel includes a timing controller (TCON), which includes the grayscale detection module 120. The timing controller can be used to perform timing-related control as needed to display the image. Therefore, in this embodiment, the signal output by the module performing grayscale detection in the timing controller TCON can be provided to the output selection module 130.

[0067] This application also provides an electronic device, which may include the display panel described in this application. The electronic device may include devices with display functions such as monitors, televisions, laptops, mobile phones, and smart wearable devices.

[0068] In summary, the display panel and electronic device provided in this application, by setting at least two power management modules corresponding to different grayscale levels, and having an output selection module selectively output the driving voltage provided by one of the power management modules according to the grayscale level, can supply different driving voltage levels to the pixel driving circuit for different grayscale levels. In this way, the problem of nonlinearity in the high and low grayscale driving voltage changes caused by circuit impedance is offset, and the risk of gamma shift or color shift problems in the display panel is reduced.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A display panel, characterized in that, The display panel includes: At least two power management modules, the different power management modules being configured to have drive voltages with different output voltage levels; A grayscale detection module is used to determine the grayscale level of the image to be displayed and output the corresponding control signal. An output selection module is provided, wherein the voltage input port of the output selection module is connected to the output ports of at least two of the power management modules respectively, and the control terminal of the output selection module is connected to the output port of the grayscale detection module. The output selection module is used to select one of the driving voltages provided by the power management module to be output to the pixel driving circuit according to the control signal output by the grayscale detection module. The display panel also includes a pulse width modulation module and a pulse amplitude modulation module; The pulse amplitude modulation module is used to generate an output signal with a corresponding pulse amplitude according to the driving voltage provided by the output selection module; The pulse width modulation module is used to provide an output signal with a corresponding pulse width according to the grayscale of the image to be displayed; The pixel driving circuit is used to generate pulse signals with corresponding amplitude and width according to the signals output by the pulse amplitude modulation module and the pulse width modulation module to drive the pixel to emit light; The output selection module is configured as follows: For control signals corresponding to lower gray levels with narrower pulse widths, select a drive voltage with a higher voltage level for output. For control signals corresponding to higher gray levels with wider pulse widths, select a driving voltage with a lower voltage level for output. The pulse amplitude is greater when displaying low grayscale than when displaying high grayscale.

2. The display panel according to claim 1, characterized in that, Each of the power management modules includes at least three voltage output ports, and at least two of the voltage output ports correspond to at least three different colors of light-emitting pixels; At least one of the power management modules is configured to output different voltage levels at the voltage output ports corresponding to at least two different colored light-emitting pixels.

3. The display panel according to claim 1, characterized in that, In at least two of the power management modules, the voltage level ratio corresponding to the first color emitting pixel is a first ratio, and the voltage level ratio corresponding to the second color emitting pixel is a second ratio, wherein the first ratio is not equal to the second ratio.

4. The display panel according to claim 2 or 3, characterized in that, The power management module is configured to operate according to a preset proportional parameter. The input voltage will be used. Converted into driving voltage of the corresponding voltage level Wherein, the driving voltage With the aforementioned proportional parameter They are positively correlated.

5. The display panel according to claim 4, characterized in that, The power management module is configured to operate according to a preset proportional parameter. and fine-tuning parameters Input voltage Converted into driving voltage of the corresponding voltage level ;in, .

6. The display panel according to claim 5, characterized in that, In the same power management module, the proportional parameters corresponding to at least two different colored light-emitting pixels and / or fine-tuning parameters different.

7. The display panel according to claim 1, characterized in that, The display panel also includes a power supply module, the output port of which is connected to the input port of each of the power management modules, and the power supply module is used to provide power to each of the power management modules.

8. The display panel according to claim 1, characterized in that, The display panel includes a timing controller TCON, and the timing controller TCON includes the grayscale detection module.

9. An electronic device, characterized in that, The electronic device includes the display panel as described in any one of claims 1-8.

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