Display module and display device

Abstract

The embodiment of the utility model discloses a display module and a display device, the display module comprises a display panel and a driving module, the display panel comprises a first common electrode and a second common electrode, the display panel is at least divided into a central area and an edge area, the first common electrode is located in the central area, and the second common electrode is located in the edge area; the driving module is configured to apply a second voltage to the second common electrode and apply a first voltage to the first common electrode when the flicker value of the edge area is greater than a preset value; wherein the flash value of the central area is smaller than or equal to a preset value. According to the technical scheme, when the display panel flickers unevenly, the driving module is configured to transmit different voltages to the common electrodes in the edge area and the center area, so that the phenomenon that the flicker degree is uneven due to the fact that the common voltage of the whole screen is not uniform is improved, and the display effect is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to display technical field, especially display module and display device. BACKGROUND

[0002] Liquid crystal display (LCD) has the advantages of good picture quality, small volume, light weight, low power consumption and low cost, and is widely used in the field of flat panel display.

[0003] The liquid crystal display panel usually changes the light transmittance of liquid crystal molecules by the voltage difference between the common electrode and the pixel electrode, so as to realize different gray scale display. Due to the possible differences in circuit wiring, element characteristics and other aspects of different areas of the panel, the sensitivity of different areas to common voltage fluctuation is different, which leads to inaccurate control of liquid crystal molecules, and thus the phenomenon of uneven flicker occurs, such as the phenomenon that the central area does not flicker, while the edge area flickers. In the related technology, the same common voltage is used for the whole screen, but when a common voltage cannot cover the flicker of the whole screen, usually only the central area is debugged not to flicker or the best common voltage value area of the central point is sacrificed to cover the whole panel, which cannot well improve the problem of uneven flicker, and in a long time of screen point, it is easy to cause liquid crystal polarization, and shorten the service life of the panel. SUMMARY

[0004] The embodiment of the utility model provides a kind of display module and display device to improve the problem of uneven flicker of display panel.

[0005] According to an aspect of the utility model, a display module is provided, comprising:

[0006] A display panel, the display panel includes a first common electrode and a second common electrode, the display panel is divided into at least a central area and an edge area, the first common electrode is located in the central area, and the second common electrode is located in the edge area;

[0007] A driving module, the driving module is configured to apply a second voltage to the second common electrode, and apply a first voltage to the first common electrode when the flick value of the edge area is greater than a preset value;

[0008] Wherein, the flick value of the central area is less than or equal to the preset value.

[0009] Optionally, the driving module is further configured to apply a third voltage to the first common electrode in a default state;

[0010] Wherein, the third voltage is the same as the second voltage.

[0011] Optionally, the display module further comprises a voltage adjusting circuit, an input end of the voltage adjusting circuit is connected with the first group of output ends of the driving module to adjust the voltage output by the first group of output ends of the driving module, and an output end of the voltage adjusting circuit is connected with the first common electrode through the first wire.

[0012] Optionally, the voltage adjusting circuit comprises a first switch unit, a second switch unit and a voltage dividing unit, and the first group of output ends of the driving module comprises a first output end, a second output end, a third output end and a fourth output end.

[0013] An input end of the first switch unit is connected with the first output end of the driving module, an output end of the first switch unit is connected with a first end of the voltage dividing unit, a second end of the voltage dividing unit is connected with the first wire, and a control end of the first switch unit is connected with the second output end of the driving module.

[0014] An input end of the second switch unit is connected with the third output end of the driving module, an output end of the second switch unit is connected with the first end of the voltage dividing unit, and a control end of the second switch unit is connected with the fourth output end of the driving module.

[0015] The first switch unit and the second switch unit are turned on at different times, and the second switch unit is turned on when the flick value of the edge area is greater than a preset value.

[0016] Optionally, the first switch unit comprises a first transistor, the second switch unit comprises a second transistor, and the voltage dividing unit comprises a first resistor and a second resistor.

[0017] A first pole of the first transistor is connected with the first output end of the driving module, a second pole of the first transistor is connected with a first end of the first resistor, a second end of the first resistor is connected with a first end of the second resistor, a second end of the second resistor is grounded, the first wire is connected with the second end of the first resistor, and a gate of the first transistor is connected with the second output end of the driving module.

[0018] A first pole of the second transistor is connected with the third output end of the driving module, a second pole of the second transistor is connected with the first end of the first resistor, and a gate of the second transistor is connected with the fourth output end of the driving module.

[0019] Optionally, the first resistor and the second resistor are adjustable resistors.

[0020] Optionally, the first group of output ends of the driving module further comprises a feedback end, and the feedback end of the driving module is connected with the first wire.

[0021] Optionally, the display panel comprises a display area and a non-display area arranged around the display area, the center area and the edge area are both located in the display area, and the voltage adjusting circuit and the driving module are both located in the non-display area.

[0022] Optionally, the display panel further comprises a transition area between the center area and the edge area, the driving module further comprises a third group of output terminals, the third group of output terminals of the driving module are connected with a third common electrode in the transition area through a third trace, and the driving module is further configured to transmit a fourth voltage to the third common electrode when the flick value of the transition area is greater than the preset value.

[0023] According to another aspect of the present application, a display device is provided, which comprises the display module provided in any of the embodiments of the present application.

[0024] The base scheme provided in the embodiments of the present application divides the display panel into at least a center area and an edge area, and configures the driving module to transmit a second voltage to the second common electrode, so that the flick value of the center area is less than or equal to a preset value, and the driving module transmits a first voltage to the first common electrode when the flick value of the edge area is greater than the preset value. The technical scheme provided in the present embodiment can improve the flicking uneven phenomenon caused by the non-uniformity of the whole-screen common voltage by configuring the driving module to transmit different voltages to the common electrodes of the edge area and the center area, which is conducive to improving the display effect.

[0025] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0027] Figure 1 A planar structure schematic diagram of a display module provided in the embodiments of the present application;

[0028] Figure 2 A cross-sectional structure schematic diagram of a display module provided in the embodiments of the present application;

[0029] Figure 3 An internal structure schematic diagram of a display module provided by the embodiment of the utility model;

[0030] Figure 4 A partial enlarged structure schematic diagram of a display module provided by the embodiment of the utility model;

[0031] Figure 5 Another partial enlarged structure schematic diagram of a display module provided by the embodiment of the utility model;

[0032] Figure 6 Another partial enlarged structure schematic diagram of a display module provided by the embodiment of the utility model;

[0033] Figure 7 Another plane structure schematic diagram of a display module provided by the embodiment of the utility model;

[0034] Figure 8 Another partial enlarged structure schematic diagram of a display module provided by the embodiment of the utility model;

[0035] Among them, 100 - drive module;200 - source driver;300 - gate driver;400 - voltage regulating circuit;CR - central region;ER - edge region;PR - transition region;

[0036] 10 - array substrate;11 - first substrate;12 - insulating layer;101 - pixel electrode;

[0037] 20 - color film substrate;201 - first common electrode;202 - second common electrode;22 - second substrate;

[0038] 30 - liquid crystal layer;

[0039] 401 - first switch unit;402 - second switch unit;403 - voltage division unit;

[0040] L1 - first wiring;L2 - second wiring;DL - data line;GL - gate signal line;

[0041] Q1 - first transistor;Q2 - second transistor;Q3 - third transistor;R1 first resistance;R2 - second resistance;

[0042] CG1 - first output end;CG2 - second output end;CG3 - third output end;CG4 - fourth output end;CG5 - fifth output end;PG1 - sixth output end. DETAILED DESCRIPTION

[0043] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0044] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0045] Figure 1 A plane structure schematic diagram of a display module provided by the embodiments of the present application, Figure 2 A plane structure schematic diagram of a display module provided by the embodiments of the present application, Figure 1 The cross-sectional structure of the display module shown along the cutting line AA' is shown in reference Figure 1 And Figure 2 The display module provided by the embodiments includes:

[0046] The display panel includes a first common electrode 201 and a second common electrode 202, and the display panel is divided into at least a center region CR and an edge region ER, the first common electrode 201 is located in the center region CR, and the second common electrode 202 is located in the edge region ER;

[0047] The driving module 100 is configured to apply a second voltage to the second common electrode 202, and apply a first voltage to the first common electrode 201 when the flick value of the edge region ER is greater than a preset value;

[0048] Among them, the flick value of the center region CR is less than or equal to the preset value.

[0049] Specifically, the flick value is used to measure the flicker degree of the display panel, the smaller the flick value, the smaller the flicker degree, the larger the flick value, the larger the flicker degree, when the flick values of different regions of a display panel are quite different, the phenomenon of uneven flicker occurs, which reduces the display effect. The display panel is divided into a center region and an edge region, and the flick values of the center region and the edge region can be measured by a photoelectric sensor or a stroboscope.

[0050] The display panel includes an array substrate 10, a color film substrate 20, and a liquid crystal layer 30 between the array substrate 10 and the color film substrate 20. The array substrate 10 includes a first substrate 11 and a pixel electrode 101, and an insulating layer 12 is arranged on the side of the pixel electrode 101 away from the first substrate 11. The color film substrate 20 includes a second substrate 22, a color resistance layer (not shown), and a common electrode layer. The common electrode layer and the pixel electrode 101 overlap to form a pixel area. The common electrode layer includes a first common electrode 201 and a second common electrode 202. The first common electrode 201 is located in the edge region ER, and the second common electrode 202 is located in the center region CR. The driving module 100 applies a voltage to the first common electrode 201 and the second common electrode 202 respectively.

[0051] In this embodiment, the driving module 100 applies a second voltage to the second common electrode 202, so that the flick value of the center region CR is less than or equal to a preset value, that is, the second voltage is the optimal voltage value that makes the center region CR not flicker. When it is detected that the flick value of the edge region ER is greater than the preset value (indicating that the flicker degree of the edge region ER is inconsistent with that of the center region CR), the driving module 100 applies a first voltage to the first common electrode 201, and the first voltage is different from the second voltage to adjust the flicker degree of the edge region ER.

[0052] It should be noted that in this embodiment, the first voltage refers to the voltage on the first common electrode 201, and the second voltage refers to the voltage on the second common electrode 202. The first voltage and / or the second voltage can be the same as or different from the voltage output by the driving module 100 itself.

[0053] The base scheme provided by the embodiment of the utility model, the display panel is divided into at least central region CR and edge region ER, and the driving module 100 is configured to transmit the second voltage to the second common electrode 202, so that the flick value of the central region CR is less than or equal to the preset value, and the first voltage is transmitted to the first common electrode 201 when the flick value of the edge region ER is greater than the preset value. The technical scheme provided by the embodiment, when the flick uneven phenomenon occurs in the display panel, the driving module 100 is configured to transmit different voltages to the common electrodes of the edge region ER and the central region CR, so as to improve the flick uneven phenomenon caused by the non-uniformity of the whole-screen common voltage, and improve the display effect.

[0054] Optionally, the driving module 100 is also configured to apply a third voltage to the first common electrode 201 in a default state. Wherein, the third voltage is the same as the second voltage. In other words, in the initial stage of display, the driving module 100 defaults to configure the common voltage of the edge region ER as the same voltage as the common voltage of the central region CR. If the common voltages of the edge region ER and the central region CR are configured as the same voltage value, and the flick value of the edge region ER is greater than the preset value, then by configuring the driving module 110, the common voltage corresponding to the edge region ER is configured as the first voltage, so as to improve the flick uneven problem.

[0055] Figure 3 For the internal structure diagram of the display module provided by the embodiment of the utility model, refer to Figure 2 And Figure 3 On the basis of the above embodiments, optionally, the display module further comprises a voltage adjusting circuit 400, the input end of the voltage adjusting circuit 400 is connected with the first group of output ends of the driving module 100, so as to adjust the voltage output by the first group of output ends of the driving module 100, the output end of the voltage adjusting circuit 400 is connected with the first common electrode 201 through the first wire L1, and the second group of output ends of the driving module 100 is connected with the second common electrode 202 through the second wire L2.

[0056] Specifically, the display panel further comprises a source driver 200, a gate driver 300 and a third transistor Q3, the gate of the third transistor Q3 is connected with a gate signal line GL, the gate signal line GL is connected with the gate driver 300, the first pole of the third transistor Q3 is connected with a data line DL, the data line DL is connected with the source driver 200, and the second pole of the third transistor Q3 is connected with a pixel electrode 101. Wherein, the gate driver 300 is used for providing a gate driving signal, the source driver 200 is used for providing a source signal, and the third transistor Q3 is turned on in response to the gate driving signal, so as to transmit the source signal on the data line DL to the pixel electrode 101.

[0057] The voltage regulating circuit 400 is configured to regulate the voltage outputted by the first group of output terminals of the driving module 100, so as to ensure that the voltage transmitted to the first common electrode 201 is the required voltage. The output voltage of the voltage regulating circuit 400 is transmitted to the first common electrode 201 through the first wire L1, and the voltage outputted by the second group of output terminals of the driving module 100 is directly transmitted to the second common electrode 202 through the second wire L2.

[0058] Figure 4 A partial enlarged structure schematic diagram of the display module is provided for the embodiment of the present application, referring to Figure 3 and Figure 4 On the basis of the above embodiment, the voltage regulating circuit 400 comprises a first switch unit 401, a second switch unit 402 and a voltage dividing unit 403, and the first group of output terminals of the driving module 100 comprises a first output terminal CG1, a second output terminal CG2, a third output terminal CG3 and a fourth output terminal CG4. The input terminal of the first switch unit 401 is connected to the first output terminal CG1 of the driving module 100, the output terminal of the first switch unit 401 is connected to the first terminal of the voltage dividing unit 403, the second terminal of the voltage dividing unit 403 is connected to the first wire L1, and the control terminal of the first switch unit 401 is connected to the second output terminal CG2 of the driving module 100. The input terminal of the second switch unit 402 is connected to the third output terminal CG3 of the driving module 100, the output terminal of the second switch unit 402 is connected to the first terminal of the voltage dividing unit 403, and the control terminal of the second switch unit 402 is connected to the fourth output terminal CG4 of the driving module 100.

[0059] The second group of output terminals of the driving module 100 comprises a sixth output terminal PG1, and the sixth output terminal PG1 of the driving module 100 is connected to the second wire L2.

[0060] The first switch unit 401 and the second switch unit 402 are time-divisionally turned on, and the second switch unit 402 is turned on when the flick value of the edge region ER is greater than the preset value.

[0061] Figure 5 Another partial enlarged structure schematic diagram of the display module is provided for the embodiment of the present application, referring to Figure 5Optionally, the first switch unit 401 comprises a first transistor Q1, the second switch unit 402 comprises a second transistor Q2, and the voltage dividing unit 403 comprises a first resistor R1 and a second resistor R2. The first pole of the first transistor Q1 is connected to the first output end CG1 of the driving module 100, the second pole of the first transistor Q1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is grounded, the first wire L1 is connected to the second end of the first resistor R1, and the gate of the first transistor Q1 is connected to the second output end CG2 of the driving module 100; the first pole of the second transistor Q2 is connected to the third output end CG3 of the driving module 100, the second pole of the second transistor Q2 is connected to the first end of the first resistor R1, and the gate of the second transistor Q2 is connected to the fourth output end CG4 of the driving module 100.

[0062] Specifically, in combination with Figure 3 , the sixth output end PG1 of the driving module 100 always transmits the second voltage to the second common electrode 202. In the default state, the second output end CG2 of the driving module 100 outputs the on level, and the fourth output end CG4 outputs the off level, so that the first transistor Q1 is turned on, the second transistor Q2 is turned off, the voltage output by the first output end CG1 of the driving module 100 is output through the first transistor Q1, and then transmitted to the first wire L1 after being divided by the first resistor R1 and the second resistor R2, and then transmitted to the first common electrode 201. Here, the voltage after the voltage output by the first output end CG1 of the driving module 100 is divided by the first resistor R1 and the second resistor R2 is the third voltage, which is the same as the second voltage. That is, the full screen adopts the same common voltage.

[0063] When the flick value of the edge region ER is detected to be greater than the preset value, the second output end CG2 of the driving module 100 outputs an off level, and the fourth output end CG4 outputs an on level, so that the first transistor Q1 is turned off, the second transistor Q2 is turned on, and the voltage output by the third output end CG3 of the driving module 100 is output through the second transistor Q1, and then transmitted to the first wire L1 through the first resistor R1 and the second resistor R2, and then transmitted to the first common electrode 201. Here, the voltage output by the third output end CG3 of the driving module 100 through the first resistor R1 and the second resistor R2 is the first voltage, which realizes that the edge region ER and the center region CE transmit different common voltages. For example, the second voltage on the second common electrode 202 of the center region CE is -1V, and by configuring the first resistor R1 and the second resistor R2, the first voltage output by the third output end CG3 of the driving module 100 through the first resistor R1 and the second resistor R2 is -2V, so as to eliminate the flicker problem caused by the inconsistency of the full-screen common voltage due to the different RC loadings under the same full-screen common voltage, and make the flicker degree of the edge region ER and the center region CR consistent.

[0064] Optionally, the first resistor R1 and the second resistor R2 can be adjustable resistors, and by configuring the ratio of the first resistor R1 to the second resistor R2, different voltage division voltages can be obtained, so as to meet the demand of different common voltages of the edge region ER.

[0065] Optionally, the second voltage output by the sixth output end PG1 of the second group of output ends of the driving module 100 is adjustable, and different voltages can be adjusted according to actual needs. For example, the configuration of the register in the driving module 100 can be changed to control the driving module 100 to output a suitable second voltage.

[0066] Figure 6 Another partial enlarged structure schematic view of the display module is provided for the embodiment of the utility model, and reference is made to Figure 6 Optionally, the first group of output ends of the driving module 100 further comprises a feedback end CG5, and the feedback end CG5 of the driving module 100 is connected to the first wire L1, so as to feed back the voltage transmitted on the first wire L1 to the driving module 100, which is beneficial to improving the control precision of the voltage transmitted by the first common electrode 201.

[0067] Figure 7 Another plane structure schematic view of the display module is provided for the embodiment of the utility model, Figure 8 Another partial enlarged structure schematic view of the display module is provided for the embodiment of the utility model, and reference is made to Figure 7 and Figure 8On the basis of the above-mentioned embodiments, optionally, the display panel further comprises a transition region PR between the center region CR and the edge region ER, the driving module 100 further comprises a third group of output terminals, the third group of output terminals of the driving module 100 is connected with a third common electrode (not shown in the figure) in the transition region PR through the third wire L3, and the driving module 100 is further configured to transmit a fourth voltage to the third common electrode when a flick value of the transition region PR is greater than a preset value.

[0068] Of course, in other embodiments, the display panel can also be divided into nine regions (for example, divided in a nine-grid manner), and the idle output terminals of the driving module 100 are used to individually configure each region of the edge, which is beneficial to further improve the phenomenon of flicker unevenness. The driving module 100 can be a driving chip.

[0069] Optionally, the third group of output terminals of the driving module 100 can also be connected with the third wire L3 through the voltage adjustment circuit 400. The specific connection relationship of this part can refer to the connection relationship of the first group of output terminals of the driving module 100, and will not be repeated here.

[0070] Optionally, in the embodiment, the display panel comprises a display area and a non-display area arranged around the display area, the center region CE and the edge region ER are both located in the display area, and the voltage adjustment circuit 400 and the driving module 100 are both located in the non-display area.

[0071] Optionally, the utility model embodiment further provides a display device, the display device includes the display module group that the utility model provides any embodiment, therefore, the display device also has the beneficial effect described in any embodiment. Wherein, the display device provided by the embodiment can be a mobile phone, and can also be any other electronic product for realizing display function.

[0072] It should be understood that the steps can be reordered, added, or deleted using the various forms of flow shown above. For example, the steps described in the utility model can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the utility model can be achieved, which is not limited herein.

[0073] The above specific embodiments do not constitute a limitation on the protection scope of the utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A display module, characterized by The display panel comprises a first common electrode and a second common electrode, and is divided into a center region and an edge region at least, the first common electrode is located in the center region, and the second common electrode is located in the edge region. The driving module applies a second voltage to the second common electrode and applies a first voltage to the first common electrode when the flick value of the edge region is greater than a preset value. The flick value of the center region is less than or equal to the preset value. The driving module applies a third voltage to the first common electrode in a default state.

2. The display module of claim 1, wherein, The third voltage is the same as the second voltage. The display module further comprises a voltage adjustment circuit, an input end of the voltage adjustment circuit is connected to a first group of output ends of the driving module to adjust the voltage output by the first group of output ends of the driving module, and an output end of the voltage adjustment circuit is connected to the first common electrode through a first wire.

3. The display module of claim 1, wherein, The voltage adjustment circuit comprises a first switch unit, a second switch unit and a voltage division unit, and the first group of output ends of the driving module comprises a first output end, a second output end, a third output end and a fourth output end.

4. The display module of claim 3, wherein, The input end of the first switch unit is connected to the first output end of the driving module, the output end of the first switch unit is connected to the first end of the voltage division unit, the second end of the voltage division unit is connected to the first wire, and the control end of the first switch unit is connected to the second output end of the driving module. The input end of the second switch unit is connected to the third output end of the driving module, the output end of the second switch unit is connected to the first end of the voltage division unit, and the control end of the second switch unit is connected to the fourth output end of the driving module. The first switch unit and the second switch unit are turned on at different times, and the second switch unit is turned on when the flick value of the edge region is greater than the preset value. The first switch unit comprises a first transistor, the second switch unit comprises a second transistor, and the voltage division unit comprises a first resistor and a second resistor.

5. The display module of claim 4, wherein, The first pole of the first transistor is connected to the first output end of the driving module, the second pole of the first transistor is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, the first wire is connected to the second end of the first resistor, and the gate of the first transistor is connected to the second output end of the driving module. The first pole of the second transistor is connected to the third output end of the driving module, the second pole of the second transistor is connected to the first end of the first resistor, and the gate of the second transistor is connected to the fourth output end of the driving module. The first resistor and the second resistor are adjustable resistors.

6. The display module of claim 5, wherein, The first group of output ends of the driving module further comprises a feedback end, and the feedback end of the driving module is connected to the first wire.

7. The display module of claim 4, wherein, ​ 8. The display module of claim 3, wherein, The display panel comprises a display area and a non-display area arranged around the display area, the center area and the edge area are located in the display area, and the voltage adjusting circuit and the driving module are located in the non-display area.

9. The display module of claim 3, wherein, The display panel further comprises a transition area between the center area and the edge area, the driving module further comprises a third group of output terminals, the third group of output terminals of the driving module are connected with a third common electrode in the transition area through a third trace, and the driving module transmits a fourth voltage to the third common electrode when a flick value of the transition area is greater than the preset value.

10. A display device, characterized by comprising: The display module comprises the display module according to any one of claims 1-9.

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