Voltage compensation circuit, display panel, display device and voltage compensation method

Abstract

The invention provides a voltage compensation circuit, a display panel, a display device and a voltage compensation method, the voltage compensation circuit is used in the display panel, the display panel comprises a plurality of pixel units, and each pixel unit comprises three sub-pixel units; the voltage compensation circuit comprises a power management chip; the power management chip is used for independently providing working voltage for each sub-pixel unit, so that the working voltage is independently provided for each sub-pixel unit through the power management chip, the working voltage of each sub-pixel unit does not need to be kept consistent, and the waste of R / G pixel power consumption is reduced while the color cast is reduced and the uniformity is improved.

Description

Technical Field

[0001] The present application relates to the field of voltage compensation technology, and in particular to a voltage compensation circuit, a display panel, a display device and a voltage compensation method. Background Art

[0002] Currently, in display panels, because the saturation area margins of the three pixels, R, G, and B, are different, the voltages supplied to the three pixels will also become inconsistent. When the ELVDD and ELVSS voltages are constant, the saturation area margins of the R / G pixels are higher than those of the B pixels. Therefore, in order to avoid color shift and uniformity problems, the saturation area margins of the B pixels need to be given priority when providing ELVDD, which results in a waste of power consumption of the R / G pixels. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a voltage compensation circuit, a display panel, a display device and a voltage compensation method.

[0004] Based on the above purpose, the present application provides a voltage compensation circuit, which is applied to a display panel, wherein the display panel includes a plurality of pixel units, each pixel unit includes three sub-pixel units; the voltage compensation circuit includes: a power management chip;

[0005] The power management chip is used to provide an independent operating voltage for each sub-pixel unit.

[0006] In some embodiments, the three sub-pixel units include a first sub-pixel unit, a second sub-pixel unit and a third sub-pixel unit; the operating voltage provided by the power management chip for the first sub-pixel unit is less than the operating voltage provided for the second sub-pixel unit, and less than the operating voltage provided for the third sub-pixel unit.

[0007] In some embodiments, the display panel includes a flexible circuit board; the power management chip is connected to the three sub-pixel units included in the pixel unit through the flexible circuit board, so that the three sub-pixel units included in the pixel unit are connected in parallel on one side of the power management chip.

[0008] In some embodiments, a voltage compensation detection pin corresponding to each of the sub-pixel units is provided on the flexible circuit board, and the voltage compensation detection pin is connected to the power management chip; the voltage compensation detection pin is used to detect the operating voltage actually received by each of the sub-pixel units on the flexible circuit board.

[0009] In some embodiments, the power management chip is also used to compensate for the output operating voltage corresponding to each sub-pixel unit based on the operating voltage actually received by each sub-pixel unit on the flexible circuit board and the output operating voltage provided by the power management chip for each sub-pixel unit.

[0010] In some embodiments, the power management chip includes three output terminals, each of which corresponds to one sub-pixel unit; wherein a first resistor, a first capacitor, and a second capacitor are arranged between each output terminal and the corresponding sub-pixel unit; a common node of the first end of the first capacitor and the first end of the first resistor is connected to the output terminal, and the second end of the first capacitor is grounded; a common node of the second end of the first resistor and the first end of the second capacitor is connected to the sub-pixel unit through the flexible circuit board, and the second end of the second circuit is grounded.

[0011] In some embodiments, a second resistor is arranged between the voltage compensation detection pin corresponding to each sub-pixel unit and the input end of the power management chip; the first end of the second resistor is connected to the input end, and the second end of the second resistor is connected to the voltage compensation detection pin.

[0012] In some embodiments, the flexible circuit board includes a gamma architecture, and the three sub-pixel units included in each pixel unit share one gamma architecture.

[0013] Based on the same concept, the present application also provides a display panel, including the voltage compensation circuit as described above.

[0014] Based on the same concept, the present application also provides a display device, including the display panel as described above.

[0015] Based on the same concept, the present application also proposes a voltage compensation method, which is applied to the voltage compensation circuit as described above, and includes:

[0016] For each sub-pixel unit, the operating voltage actually received by the sub-pixel unit on the flexible printed circuit board and the output operating voltage provided by the power management chip for the sub-pixel unit are obtained; and the output operating voltage is compensated based on the actually received operating voltage and the output operating voltage.

[0017] From the above description, it can be seen that the voltage compensation circuit, display panel, display device and voltage compensation method provided by the present application, the voltage compensation circuit is applied to the display panel, the display panel includes a plurality of pixel units, each pixel unit includes three sub-pixel units; the voltage compensation circuit includes: a power management chip; the power management chip is used to provide a separate working voltage for each of the sub-pixel units, so that the power management chip provides a separate working voltage for each sub-pixel unit, so that the working voltages of each sub-pixel unit do not have to be kept consistent, while reducing color deviation and improving uniformity, reducing the waste of R / G pixel power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the structure of a first voltage compensation circuit according to an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the structure of a second voltage compensation circuit according to an embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the structure of a third voltage compensation circuit according to an embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of the structure of a fourth voltage compensation circuit according to an embodiment of the present application;

[0023] Figure 5 A schematic diagram of a flow chart of a voltage compensation method according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with general skills in the field to which the present application belongs. The "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, which can be direct connections, indirect connections, wired connections, and wireless connections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In addition, in the description of the present application, unless otherwise specified, the term "multiple" refers to two or more. The term "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0026] The principles and spirit of the present application will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present application, and are not intended to limit the scope of the present application in any way. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0027] It is understandable that before using the technical solutions of each embodiment of the present application, the type, scope of use, usage scenarios, etc. of the personal information involved will be informed to the user in an appropriate manner, and the user's authorization will be obtained.

[0028] For example, in response to receiving an active request from a user, a prompt message is sent to the user to clearly remind the user that the operation requested to be performed will require obtaining and using the user's personal information. Thus, the user can independently choose whether to provide personal information to the electronic device, application, server, storage medium or other software or hardware that performs the operation of the technical solution of the present application according to the prompt message.

[0029] As an optional but non-limiting implementation, in response to receiving the user's active request, the prompt information may be sent to the user in the form of a pop-up window, in which the prompt information may be presented in text form. In addition, the pop-up window may also carry a selection control for the user to choose "agree" or "disagree" to provide personal information to the electronic device.

[0030] It is understandable that the above notification and the process of obtaining user authorization are merely illustrative and do not constitute a limitation on the implementation method of this application. Other methods that meet relevant laws and regulations may also be applied to the implementation method of this application.

[0031] It should be understood herein that any number of elements in the drawings is for illustration rather than limitation, and any naming is only for distinction rather than having any limiting meaning.

[0032] As described in the background technology, in the current related technology, the three pixels of R, G, and B correspond to the same operating voltage, that is, it is impossible to adjust the operating voltage (ELVDD) of a certain sub-pixel unit separately. For the single-channel ELVDD in the current related technology, dynamic ELVDD Compensation only needs one ELVDD detection pin, which can detect the voltage change of ELVDD on different module lighting fixtures or AP ends to dynamically adjust the voltages of VGSP and VGMP, thereby ensuring that the brightness and color coordinates of modules on different module lighting fixtures or AP ends can remain consistent. However, the dynamic adjustment of the voltages of VGSP and VGMP cannot change the cross-voltage of ELVDD and ELVSS. Therefore, in order to avoid color deviation and uniformity problems in the related technology, when providing ELVDD, it is necessary to give priority to the saturation area margin of the B pixel, resulting in a waste of power consumption of the R / G pixels.

[0033] In order to solve the above technical problems, the present application proposes a voltage compensation circuit, which is applied to a display panel, wherein the display panel includes multiple pixel units, each pixel unit includes three sub-pixel units; the voltage compensation circuit includes: a power management chip; the power management chip is used to provide a separate working voltage for each of the sub-pixel units, so that the power management chip provides a separate working voltage for each sub-pixel unit, so that the working voltages of each sub-pixel unit do not have to be consistent, thereby reducing the waste of R / G pixel power consumption while reducing color deviation and improving uniformity.

[0034] refer to Figure 1 , is a schematic diagram of the structure of a voltage compensation circuit according to an embodiment of the present application, the voltage compensation circuit is applied to a display panel, the display panel includes a plurality of pixel units 041, each pixel unit includes three sub-pixel units; the voltage compensation circuit includes: a power management chip 01;

[0035] The power management chip 01 is used to provide an independent operating voltage for each sub-pixel unit.

[0036] It should be noted that the display panel may be an OLED display panel or other display panels without limitation.

[0037] In some embodiments, the three sub-pixel units include a first sub-pixel unit, a second sub-pixel unit and a third sub-pixel unit; the operating voltage provided by the power management chip for the first sub-pixel unit is less than the operating voltage provided for the second sub-pixel unit, and less than the operating voltage provided for the third sub-pixel unit.

[0038] It should be noted that, when the voltage across ELVDD and ELVSS is constant, the saturation region margin of the second and third sub-pixel units is higher than the saturation region margin of the first sub-pixel unit, and therefore, the operating voltage provided by the power management chip to the second and third sub-pixel units can be appropriately reduced. Optionally, in some embodiments, the first sub-pixel unit can be a blue sub-pixel unit (B), and the second and third sub-pixel units can be any one of a red sub-pixel unit (R) and a green sub-pixel unit (G).

[0039] In some embodiments, reference Figure 2 The power management chip (PMIC) 01 provides operating voltages to the three sub-pixel units in the display panel 04 through the three paths of ELVDD-R, ELVDD-G, and ELVDD-B respectively. At the same time, the operating voltage corresponding to each sub-pixel unit is detected through the three paths of ELVDD-R-FBS, ELVDD-G-FBS, and ELVDD-B-FBS. By comparing the two, the operating voltage compensation can be completed.

[0040] In some embodiments, reference Figure 4 The display panel includes a flexible circuit board (FPC) 02; the power management chip (PMIC) 01 is connected to the three sub-pixel units included in the pixel unit through the flexible circuit board 02, so that the three sub-pixel units included in the pixel unit are connected in parallel on one side of the power management chip. Figure 4 The power management chip (PMIC) 01 provides operating voltages for the three sub-pixel units through ELVDD-R, ELVDD-G, and ELVDD-B respectively.

[0041] In some embodiments, reference Figure 4The flexible circuit board 02 is provided with a voltage compensation detection pin corresponding to each sub-pixel unit, and the voltage compensation detection pin is connected to the power management chip 01; the voltage compensation detection pin is used to detect the actual working voltage received by each sub-pixel unit on the flexible circuit board. Optionally, refer to Figure 4 The power management chip 01 is connected to the voltage compensation detection pins corresponding to the three sub-pixel units through three paths of ELVDD-R-FBS, ELVDD-G-FBS, and ELVDD-B-FBS.

[0042] In some embodiments, the power management chip is also used to compensate for the output operating voltage corresponding to each sub-pixel unit based on the operating voltage actually received by each sub-pixel unit on the flexible circuit board and the output operating voltage provided by the power management chip for each sub-pixel unit.

[0043] It should be noted that the reference Figures 2 to 4 In this embodiment, the ELVDD compensation detection pins of the three ELVDD-R, ELVDD-G, and ELVDD-B are placed on the module FPC, and these pins are respectively connected to the ELVDD-R-FBS, ELVDD-G-FBS, and ELVDD-B-FBS on the PMIC (power management chip). When the Panel (display panel) is powered on, the ELVDD compensation detection pin detects the voltages of ELVDD-R, ELVDD-G, and ELVDD-B, and feeds back to the corresponding ELVDD-R-FBS, ELVDD-G-FBS, and ELVDD-B-FBS pins of the PMIC. The ELVDD-R-FBS is compared with the ELVDD-R on the Panel pin inside the PMIC. If the voltage comparison has an increase or decrease in fluctuation, the corresponding ELVDD-R voltage is correspondingly reduced or increased inside the ELVDD to maintain a constant voltage difference between the input ELVDD-R voltage and VGMP / VGSP. The same applies to ELVDD-G and ELVDD-B.

[0044] In some embodiments, reference Figure 3 , the power management chip includes three output terminals, each of which corresponds to one sub-pixel unit; wherein a first resistor R1, a first capacitor C1, and a second capacitor C2 are arranged between each output terminal and the corresponding sub-pixel unit; a common node of a first end of the first capacitor C1 and a first end of the first resistor R1 is connected to the output terminal, and a second end of the first capacitor C1 is grounded; a common node of a second end of the first resistor R1 and a first end of the second capacitor C2 is connected to the sub-pixel unit through the flexible circuit board, and a second end of the second capacitor C2 is grounded.

[0045] In some embodiments, reference Figure 3 A second resistor R2 is arranged between the voltage compensation detection pin corresponding to each sub-pixel unit and the input end of the power management chip; the first end of the second resistor R2 is connected to the input end, and the second end of the second resistor R2 is connected to the voltage compensation detection pin.

[0046] In some embodiments, the flexible circuit board includes a gamma architecture, and the three sub-pixel units included in each pixel unit share one gamma architecture. It should be noted that, for the three-way ELVDD grouping module, ELVDD has three groups of voltages. If the dynamic ELVDD compensation function is required, three groups of R, G, and B ELVDD compensation detection pins and three groups of VGMP and VGSP voltages, namely VGMP_R, VGMP_G, VGMP_B and VGSP_R, VGSP_G, VGSP_B, are required. If two groups of VGMP / VGSP are added respectively, there will be some changes to the module gamma architecture, and two groups of gamma architecture will be added. In order to cooperate with the three groups of gamma architecture, the source architecture inside the DDIC (screen display driver chip) also needs to be changed, and two groups of gamma resistor strings will be added, thereby increasing the size of the DDIC. At the same time, two groups of VGMP / VGSP are added, and at least 4 capacitors corresponding to the peripheral capacitors of these two groups of voltages also need to be added. Therefore, in order to save costs and reduce the size of the final display panel, in the embodiment of the present application, for the three-way ELVDD grouping product, three-way ELVDD compensation detection pins of ELVDD-R, ELVDD-G, and ELVDD-B are used to detect the floating condition of the ELVDD voltage, and then the operating voltage compensation is achieved through the PMIC (power management chip), so that for the gamma architecture, a set of gamma architecture can still be used, and for VGMP / VGSP, a set of VGMP / VGSP can also be used.

[0047] The voltage compensation circuit provided in the present application is applied to a display panel, wherein the display panel includes a plurality of pixel units, each pixel unit includes three sub-pixel units; the voltage compensation circuit includes: a power management chip; the power management chip is used to provide a separate operating voltage for each of the sub-pixel units, thereby providing a separate operating voltage for each sub-pixel unit through the power management chip, so that the operating voltages of each sub-pixel unit do not have to be kept consistent, thereby reducing the waste of R / G pixel power consumption while reducing color deviation and improving uniformity.

[0048] Based on the same inventive concept, corresponding to the voltage compensation circuit in any of the above embodiments, the application further provides a display panel, including the voltage compensation circuit as described in any of the above embodiments. The display panel in the above embodiment is used to implement the function of the corresponding voltage compensation circuit in any of the above embodiments, and has the beneficial effects of the corresponding voltage compensation circuit embodiment, which will not be repeated here.

[0049] Based on the same inventive concept, corresponding to the voltage compensation circuit of any of the above embodiments, the application further provides a display device, including the display panel of any of the above embodiments. The display device can be a mobile phone, a tablet computer, a PC, a TV, etc.

[0050] The display panel of the above embodiment is used to implement the functions of the corresponding display panel in any of the above embodiments, and has the beneficial effects of the corresponding display panel embodiment, which will not be described in detail here.

[0051] Based on the same inventive concept, corresponding to the voltage compensation circuit in any of the above embodiments, the present application also provides a voltage compensation method, referring to Figure 5 , the method comprises the following steps:

[0052] S101, obtaining the operating voltage actually received by the sub-pixel unit on the flexible printed circuit board and the output operating voltage provided by the power management chip for the sub-pixel unit.

[0053] S102: Compensate the output operating voltage based on the actually received operating voltage and the output operating voltage.

[0054] It should be noted that the voltage compensation steps of steps S101 and S102 are performed for each sub-pixel unit, that is, each sub-pixel unit performs the above steps S101 and S102.

[0055] In order to accurately perform voltage compensation, in some embodiments, compensating the output operating voltage based on the actually received operating voltage and the output operating voltage specifically includes:

[0056] In response to the actually received operating voltage being less than the output operating voltage, increasing the output operating voltage;

[0057] In response to the actually received operating voltage being greater than the output operating voltage, the output operating voltage is reduced.

[0058] The voltage compensation method for display terminal image quality in the above-mentioned embodiment is used to realize the function of the corresponding voltage compensation circuit in any of the above-mentioned embodiments, and has the beneficial effects of the corresponding voltage compensation circuit embodiment, which will not be described in detail here.

[0059] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0060] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0061] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0062] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A voltage compensation circuit, characterized in that: The voltage compensation circuit is applied to a display panel, the display panel includes a plurality of pixel units, each pixel unit includes three sub-pixel units; the voltage compensation circuit includes: a power management chip; The power management chip is used to provide an independent operating voltage for each sub-pixel unit.

2. The circuit according to claim 1, characterized in that The three sub-pixel units include a first sub-pixel unit, a second sub-pixel unit and a third sub-pixel unit; the operating voltage provided by the power management chip to the first sub-pixel unit is smaller than the operating voltage provided to the second sub-pixel unit, and is smaller than the operating voltage provided to the third sub-pixel unit.

3. The circuit according to claim 1, characterized in that The display panel includes a flexible circuit board; the power management chip is connected to the three sub-pixel units included in the pixel unit through the flexible circuit board, so that the three sub-pixel units included in the pixel unit are connected in parallel on one side of the power management chip.

4. The circuit according to claim 3, characterized in that The flexible circuit board is provided with a voltage compensation detection pin corresponding to each of the sub-pixel units, and the voltage compensation detection pin is connected to the power management chip; the voltage compensation detection pin is used to detect the operating voltage actually received by each of the sub-pixel units on the flexible circuit board.

5. The circuit according to claim 4, characterized in that The power management chip is also used to compensate the output operating voltage corresponding to each sub-pixel unit based on the operating voltage actually received by each sub-pixel unit on the flexible circuit board and the output operating voltage provided by the power management chip for each sub-pixel unit.

6. The circuit according to claim 3, characterized in that The power management chip includes three output terminals, each of which corresponds to one sub-pixel unit; wherein a first resistor, a first capacitor, and a second capacitor are arranged between each output terminal and the corresponding sub-pixel unit; a common node of a first end of the first capacitor and a first end of the first resistor is connected to the output terminal, and a second end of the first capacitor is grounded; a common node of a second end of the first resistor and a first end of the second capacitor is connected to the sub-pixel unit through the flexible circuit board, and a second end of the second circuit is grounded.

7. The circuit according to claim 4, characterized in that A second resistor is arranged between the voltage compensation detection pin corresponding to each sub-pixel unit and the input end of the power management chip; the first end of the second resistor is connected to the input end, and the second end of the second resistor is connected to the voltage compensation detection pin.

8. The circuit according to claim 3, characterized in that The flexible circuit board includes a gamma architecture, and the three sub-pixel units included in each pixel unit share one gamma architecture.

9. A display panel, characterized in that: The invention comprises a voltage compensation circuit as claimed in any one of claims 1 to 8.

10. A display device, characterized in that: Comprising the display panel as claimed in claim 9.

11. A voltage compensation method, characterized in that: The method is applied in the voltage compensation circuit according to any one of claims 1 to 8; the method comprises: For each sub-pixel unit, the operating voltage actually received by the sub-pixel unit on the flexible printed circuit board and the output operating voltage provided by the power management chip for the sub-pixel unit are obtained; and the output operating voltage is compensated based on the actually received operating voltage and the output operating voltage.

12. The method according to claim 11, characterized in that Compensating the output operating voltage based on the actually received operating voltage and the output operating voltage specifically includes: In response to the actually received operating voltage being less than the output operating voltage, increasing the output operating voltage; In response to the actually received operating voltage being greater than the output operating voltage, the output operating voltage is reduced.

Images