Display panel and electronic equipment

Abstract

The invention provides a display panel and electronic equipment, and the display panel comprises at least two power management modules, and different power management modules are configured to output driving voltages of different voltage levels; the gray scale detection module is used for determining the gray scale level of an image needing to be displayed and outputting a corresponding control signal; and the voltage input port of the output selection module is connected with the output ports of the at least two power supply management modules, and the output selection module is used for selectively outputting the driving voltage provided by one power supply management module to the pixel driving circuit according to the control signal output by the gray scale detection module. Therefore, driving voltages of different voltage levels can be output according to different gray scale levels to be supplied to the pixel driving circuit, so that the problem of nonlinear change of the driving voltages of high and low gray scales caused by circuit impedance is counteracted, and the risk that the display panel generates gama offset or color cast is reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and an electronic device. Background Art

[0002] In some display panels, in order to display different brightness, it is necessary to selectively adjust the current value provided to the light-emitting pixel. Usually, a solution combining pulse width modulation (PWM) and pulse amplitude modulation (PAM) is adopted to control the output voltage, and then the output voltage controls the degree of transistor opening to convert the voltage into current. However, in such a solution, the current change between high grayscale and low grayscale may cause nonlinear changes in circuit impedance, resulting in gama offset or color deviation in the display panel. Summary of the invention

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

[0004] At least two power management modules, different power management modules are configured to output drive voltages of different voltage levels;

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

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

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

[0008] For the control signal corresponding to the lower gray scale, a driving voltage output with a higher voltage level is selected;

[0009] For the control signal corresponding to a higher gray scale, a driving voltage output with a lower voltage level is selected.

[0010] In a 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 color 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 light-emitting pixels of different colors.

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

[0013] In a possible implementation, the power management module is configured to convert the input voltage V in Converted into a driving voltage V corresponding to the voltage level out ; Wherein, the driving voltage V out Positively correlated with the proportional parameter K;

[0014] Preferably, the power management module is configured to adjust the input voltage V according to the preset proportional parameter K and the fine-tuning parameter M. in Converted into a driving voltage V corresponding to the voltage level out ; Among them, V in =K*V out +M.

[0015] In a possible implementation manner, in the same power management module, the ratio parameter K and / or the fine-tuning parameter M corresponding to at least two pixels of different colors are different.

[0016] In a 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 form an output signal corresponding to the 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 of corresponding pulse width according to the gray scale of the image to be displayed;

[0019] The pixel driving circuit is used to generate a pulse signal 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.

[0020] In a possible implementation, the display panel further includes a power supply module, an output port of the power supply module is connected to an 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 a possible implementation manner, the display panel includes a timing controller TCON, and the timing controller TCON includes the grayscale detection module.

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

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

[0024] A display panel and electronic device provided by the present application, by setting at least two power management modules corresponding to different grayscale levels, an output selection module selectively outputs a driving voltage provided by one of the power management modules according to the grayscale level, so that driving voltages of different voltage levels can be output for different grayscale levels and supplied to a pixel driving circuit. In this way, the problem of nonlinear variation of high and low grayscale driving voltages caused by circuit impedance is offset, and the risk of gama offset or color deviation problems in the display panel is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of a part of the circuit of a display panel in the prior art;

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

[0028] Figure 3 One of the partial circuit diagrams of the display panel provided in the embodiment of the present application;

[0029] Figure 4 A second schematic diagram of a portion of the circuit of a display panel provided in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of a pulse waveform after compensation provided in an embodiment of the present application;

[0031] Figure 6 The third partial circuit diagram of the display panel provided in the embodiment of the present application.

[0032] Icons: 110 - power management module; 120 - grayscale detection module; 130 - output selection module; 140 - pulse amplitude modulation module; 150 - pulse width modulation module; 160 - pixel driving circuit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] It should be noted that, in the absence of conflict, different features in the embodiments of the present application may be combined with each other.

[0038] Please refer to Figure 1 In some existing display panels, a pulse amplitude modulation module 940 and a pulse width modulation module 950 are used to cooperate to control the current obtained by the pixel driving circuit 960. However, in such a solution, the pulse amplitude modulation module 940 always obtains power from a power management module 910. Therefore, no matter what grayscale image is displayed on the display panel, the pulse amplitude modulation module 940 outputs the same voltage. Therefore, the pixel driving circuit 960 can only generate currents with different pulse widths to drive the pixels to emit light according to the signals provided by the pulse amplitude modulation module 940 and the pulse width modulation module 950. However, each circuit in the display panel always has a certain impedance, resulting in the current change between high and low grayscales is not non-linear.

[0039] For example, see Figure 2 Under ideal conditions, the pulse waveform of the driving current should be rectangular, and the effective current (equivalent to the pulse area) changes linearly with the pulse width (equivalent to the bottom length of the pulse waveform).

[0040] However, there is always a certain impedance in the circuit. The current provided by the pixel driving circuit 960 from the signal obtained by 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. Among them, the current value in the pulse time corresponding to the rising and falling edges does not reach the required amplitude, and there is a certain invalid part (such as Figure 2 The area shown by the dashed line in the middle). When the pulse width is narrow (such as when displaying a low grayscale image), the invalid part 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 part corresponding to the rising and falling edges accounts for a relatively small proportion of the entire pulse time. This results in the nonlinear change of the effective current (equivalent to the pulse area) with the pulse width (equivalent to the length of the bottom of the pulse waveform) between high and low grayscales.

[0041] The nonlinear change of the current between high gray scale and low gray scale will cause the brightness change of the display panel between high gray scale and low gray scale to be nonlinear, that is, it will cause gama offset of the display panel.

[0042] In view of this, this embodiment provides a solution that can improve the above-mentioned problem. The solution provided by this embodiment is described in detail below.

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

[0044] Among the at least two power management modules 110, different power management modules 110 are configured to output driving voltages of different voltage levels, wherein different power management modules 110 may 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 a corresponding control signal. One output port of the grayscale detection module 120 can be connected to the output selection module 130 to send the control signal to the output selection module 130.

[0046] The voltage input port of the output selection module 130 is respectively connected to the output ports of at least two of the power management modules 110, and the control end 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 the driving voltage provided by one of the power management modules 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 of the power management modules 110 can provide at least two different voltage levels of driving voltage to the output selection module 130, and 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. On this basis, the output selection module 130 can select one of the driving voltages of at least two different voltage levels provided by the power management module 110 according to the control signal for output. In this way, the driving voltage output by the output selection module 130 cooperates with other circuits or modules related to pulse amplitude modulation, and can modulate both the pulse width and pulse amplitude of the voltage signal obtained by the pixel driving circuit 160, thereby eliminating the problem of nonlinear variation of high and low grayscale driving voltages caused by circuit impedance and reducing the risk of gama offset problems in the display panel.

[0048] Further, in a 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 form an output signal corresponding to the 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 gray scale of the image to be displayed.

[0051] The pixel driving circuit 160 is used to generate a pulse signal 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] In this way, the pulse width modulation module 150 and the pulse amplitude modulation module 140 cooperate to modulate both the pulse width and the pulse amplitude of the voltage signal obtained by the pixel driving circuit 160, thereby eliminating the nonlinear problem of high and low grayscale driving voltage changes caused by circuit impedance and reducing the risk of gama offset problems in the display panel.

[0053] Please refer again Figure 2 , when the pulse amplitude is the same, since the pulse width corresponding to the low gray scale is narrower, and the pulse width corresponding to the high gray scale is wider, the invalid part of the rising and falling edges of the pulse accounts for a relatively larger proportion in the pulse corresponding to the low gray scale.

[0054] Therefore, in a possible implementation, the output selection module 130 may be configured to select a driving voltage output with a higher voltage level for a control signal corresponding to a lower grayscale, and to select a driving voltage output with a lower voltage level for a control signal corresponding to a higher grayscale.

[0055] In this way, the pulse amplitude when displaying low gray scale can be made greater than the pulse amplitude when displaying high gray scale, thereby offsetting the influence of the invalid part in the rising and falling edges of the pulse, making the current change between low gray scale and high gray scale more consistent with linear change.

[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 grayscale current is greater than the pulse amplitude of the high grayscale 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 corresponding to the pulse waveform closer to linear than the change in the bottom length of the pulse waveform, that is, making the change in the driving current value between the high grayscale and the low grayscale closer to linear.

[0057] In some scenarios, due to the different materials of the electroluminescent layers in pixels of different colors, there are also certain impedance differences between pixels of different colors. Therefore, in a possible implementation of this embodiment, please refer to Figure 6 Each of the power management modules 110 includes at least three voltage output ports, and at least two of the voltage output ports correspond to at least three different color light-emitting pixels. At least one of the power management modules 110 is configured to output different voltage levels for the voltage output ports corresponding to at least two different color light-emitting pixels. In this way, the same power management module 110 can output driving voltages of different voltage levels for different colors, thereby offsetting the color deviation caused by impedance between pixels of different colors.

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

[0059] For example, the voltage output by the power management module 110 for the red light-emitting pixel corresponding to a lower gray scale is V R1 , for the green pixel output voltage V G1 , the voltage output for the blue light-emitting pixel is V B1 ; The voltage output by the power management module 110 for the red light-emitting pixel corresponding to a higher grayscale is V R2 , for the green pixel output voltage V G2 , the voltage output for the blue light-emitting pixel is V B2 . V R1 / V R2 、V G1 / V G2 and V B1 / V B2 Among 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 grayscales, thereby offsetting the color deviation caused by different impedance change rates of different color luminous pixels at different grayscales due to different materials.

[0061] In a possible implementation, the power management module 110 is configured to convert the input voltage V in Converted into a driving voltage V corresponding to the voltage level out ; Wherein, the driving voltage V out It is positively correlated with the proportional parameter K.

[0062] Preferably, the power management module 110 is configured to adjust the input voltage V according to a preset ratio parameter L and a fine-tuning parameter M. in Converted into a driving voltage V corresponding to the voltage level out ; Among them, V in =K*V oUt +M.

[0063] In this way, by configuring the proportional parameter K and the fine-tuning parameter M in different power management modules 110 , different voltage management modules can output driving voltages of different levels.

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

[0065] In a possible implementation, the display panel may further include a power supply module, the output port of the power supply module is connected to the input port of each power management module 110, and the power supply module is used to provide power to each power management module 110. That is, each power management module may be connected to the same power supply module, and then the configuration of each power management module is the same, so that the input voltage can be adjusted to output driving voltages of different voltage levels.

[0066] In a possible implementation, the display panel includes a timing controller TCON, and the timing controller TCON includes the grayscale detection module 120. The timing controller can be used to perform timing-related control according to the display image as needed. 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] The present application also provides an electronic device, which may include the display panel provided in the present application. The electronic device may include a display, a television, a laptop, a mobile phone, a smart wearable device, or other device with a display function.

[0068] In summary, a display panel and an electronic device provided by the present application, by setting at least two power management modules corresponding to different grayscale levels, the output selection module selectively outputs the driving voltage provided by one of the power management modules according to the grayscale level, so that driving voltages of different voltage levels can be output for different grayscale levels and supplied to the pixel driving circuit. In this way, the problem of nonlinear changes in high and low grayscale driving voltages caused by circuit impedance is offset, and the risk of gama offset or color deviation problems in the display panel is reduced.

[0069] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A display panel, characterized in that: The display panel comprises: At least two power management modules, different power management modules are configured to output drive voltages of different voltage levels; A grayscale detection module, the grayscale detection module is used to determine the grayscale level of the image to be displayed and output a corresponding control signal; An output selection module, wherein a voltage input port of the output selection module is respectively connected to output ports of at least two of the power management modules, a control end of the output selection module is connected to an output port of the grayscale detection module, and the output selection module is used to select and output a driving voltage provided by one of the power management modules to a pixel driving circuit according to a control signal output by the grayscale detection module.

2. The display panel according to claim 1, characterized in that: The output selection module is configured as follows: For the control signal corresponding to the lower gray scale, a driving voltage output with a higher voltage level is selected; For the control signal corresponding to a higher gray scale, a driving voltage output with a lower voltage level is selected.

3. The display panel according to claim 1, characterized in that: Each of the power management modules comprises at least three voltage output ports, and at least two of the voltage output ports correspond to at least three different color light-emitting pixels respectively; 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-color light-emitting pixels.

4. 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 light-emitting pixels is a first ratio, and the voltage level ratio corresponding to the second color light-emitting pixels is a second ratio, and the first ratio is not equal to the second ratio.

5. The display panel according to claim 3 or 4, characterized in that: The power management module is configured to convert the input voltage V in Converted into a driving voltage V corresponding to the voltage level out ; Wherein, the driving voltage V out Positively correlated with the proportional parameter K; Preferably, the power management module is configured to adjust the input voltage V according to a preset proportional parameter K and a fine-tuning parameter M. in Converted into a driving voltage V corresponding to the voltage level out ; Among them, V in =K*V out +M.

6. The display panel according to claim 5, characterized in that: In the same power management module, at least two pixels of different colors may correspond to different ratio parameters K and / or fine-tuning parameters M.

7. The display panel according to claim 1, characterized in that: The display panel also includes a pulse width modulation module and a pulse amplitude modulation module; The pulse amplitude modulation module is used to form an output signal corresponding to the 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 of corresponding pulse width according to the gray scale of the image to be displayed; The pixel driving circuit is used to generate a pulse signal 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.

8. The display panel according to claim 1, characterized in that: The display panel further comprises a power supply module, an output port of the power supply module is connected to an 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.

9. 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.

10. An electronic device, characterized in that: The electronic device comprises the display panel according to any one of claims 1 to 9.

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