Pixel structure, display panel and display device

Abstract

This invention relates to pixel structures, display panels, and display devices. The pixel structure includes a driving transistor and pixel electrodes, with the drain of the driving transistor connected to the pixel electrodes. An adjustable resistor is connected between the drain of the driving transistor and the pixel electrodes, and the resistance value of the adjustable resistor is positively correlated with the applied pressure. In the above pixel structure, the adjustable resistor acts as a voltage divider on the pixel electrodes, reducing the electric field strength generated between the pixel electrodes and the common electrode, thus reducing display brightness. When the pressing pressure on the pixel structure is large, the reduction in display brightness is more significant. In this case, the white line phenomenon caused by the pressing pressure acting on the liquid crystal molecules in the liquid crystal layer is less noticeable, or even eliminated, thereby improving or eliminating scratch defects. Simultaneously, when the pressing pressure is small, the adjustable resistor has a small resistance value, which can avoid excessively affecting the display brightness and contrast performance of the area where the pressed pixel structure is located.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a pixel structure, a display panel, and a display device. Background Technology

[0002] Existing display products generally suffer from trace mura defects. Specifically, this refers to the abnormal appearance of white lines in the pressed area when the screen is pressed or scratched by a finger or hard object. These white lines disappear slowly, requiring a relatively long time to return to normal. This affects the user's ability to perceive the information displayed on the screen, resulting in a degraded user experience. Summary of the Invention

[0003] The present invention provides a pixel structure, a display panel, and a display device to solve the technical problem of scratch mura defects existing in the prior art.

[0004] The pixel structure provided by the present invention includes a driving transistor and a pixel electrode, wherein the drain of the driving transistor is connected to the pixel electrode; an adjustable resistor is connected between the drain of the driving transistor and the pixel electrode, and the resistance value of the adjustable resistor is positively correlated with the applied pressure.

[0005] The adjustable resistor is a sliding rheostat, which has a slider for adjusting the resistance value of the rheostat.

[0006] The pixel structure further includes a guide post, which is positioned opposite to the slider and can approach the slider under pressure and reset when the pressure is removed.

[0007] The guide post is connected to the slider, and when the guide post is subjected to pressure, it acts on the slider to cause the slider to move in the direction of increasing resistance.

[0008] The guide post and the slider are spaced apart. A first magnet is provided at the end of the guide post facing the slider, and a second magnet is provided at the end of the slider facing the guide post. The first magnet and the second magnet repel each other. The slider moves in the direction of increasing resistance due to the increased repulsive force between the first magnet and the second magnet.

[0009] The guide post and the slider are spaced apart. A first magnet is provided at one end of the guide post facing the slider, and a second magnet is provided at one end of the slider facing the guide post. The first magnet and the second magnet attract each other. The slider moves in the direction of increasing resistance due to the increased attraction between the first magnet and the second magnet.

[0010] The guide post is a spacer.

[0011] The display panel provided by the present invention includes the pixel structure described above.

[0012] The display panel includes a first substrate, a second substrate, and a liquid crystal layer located between the first substrate and the second substrate. The driving transistor is formed on the first substrate, and a spacer is formed on the second substrate.

[0013] The display device provided by the present invention includes the display panel described above.

[0014] Compared with the prior art, the pixel structure, display panel, and display device provided by the present invention have the following technical advantages:

[0015] The pixel structure provided by this invention utilizes an adjustable resistor connected in series between the drain of the driving transistor and the pixel electrode. This adjustable resistor effectively divides the voltage across the pixel electrode, reducing the voltage signal applied to it and consequently lowering the electric field strength between the pixel electrode and the common electrode. In this scenario, the deflection angle of the liquid crystal molecules in the liquid crystal layer decreases, reducing light transmittance and thus lowering the display brightness of the pixel area. Furthermore, when the pressing pressure on the pixel structure is high, the adjustable resistor exhibits a larger resistance value, making its voltage-dividing effect on the pixel electrode more significant. This results in a greater reduction in the deflection angle of the liquid crystal molecules in the liquid crystal layer, further lowering the display brightness of the pixel area. With the display brightness of the pixel area decreasing and darkening with increasing pressing pressure, the white line phenomenon caused by the pressing pressure on the liquid crystal molecules in the liquid crystal layer becomes less noticeable, or even eliminated, thereby improving or eliminating trace mura defects. Simultaneously, when the pressing pressure on the pixel structure is small, the adjustable resistor has a small resistance value. This reduces the voltage division effect of the adjustable resistor on the pixel electrode, ultimately resulting in a smaller decrease in the deflection angle of the liquid crystal molecules in the liquid crystal layer. Consequently, the reduction in display brightness in the area where the pixel structure is located is smaller. This allows for the improvement of trace mura defects while avoiding excessive impact on the display brightness and contrast performance of the pressed pixel structure area. Furthermore, when the pixel structure is not subjected to pressing pressure, the resistance value of the adjustable resistor can be reduced to a minimum (the minimum resistance value of the adjustable resistor can be set to 0). At this time, the voltage division effect of the adjustable resistor on the pixel electrode is smaller or even non-existent. Under this condition, the electric field generated between the pixel electrode and the common electrode can achieve a normal or near-normal electric field strength. Under the action of this electric field, the liquid crystal molecules in the liquid crystal layer can have a normal or near-normal deflection angle, and the area where the pixel structure is located can achieve a normal or near-normal display brightness. This ensures that the area where the pixel structure is located has normal display brightness and contrast performance when it is not pressed, or that the reduction in display performance and quality is within a small range (compared to the case where the voltage signal on the pixel electrode is not divided).

[0016] The display panel provided by the present invention includes the pixel structure described above, and naturally has the same beneficial effects as the pixel structure described above, which will not be repeated here.

[0017] The display device provided by the present invention includes the display panel described above, and naturally has the same beneficial effects as the display panel described above, which will not be repeated here. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the pixel structure in one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram illustrating the adjustment of the resistance value of the adjustable resistor by the guide post in one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram illustrating the adjustment of the resistance value of an adjustable resistor using a guide post, according to another embodiment of the present invention.

[0023] In the picture:

[0024] 10 - Driver transistor; 11 - Gate; 12 - Source; 13 - Drain;

[0025] 20-pixel electrode;

[0026] 30 - Adjustable resistor; 31 - Second magnet;

[0027] 40 - gate line; 50 - data line;

[0028] 60 - Guide post; 61 - First magnet;

[0029] 100 - First substrate; 200 - Second substrate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The following description, in conjunction with the accompanying drawings, describes embodiments of the pixel structure, display panel, and display device provided by the present invention.

[0032] In one embodiment of the pixel structure of the present invention, see Figure 1The pixel structure includes a driving transistor 10 and a pixel electrode 20. The driving transistor 10 includes a gate 11, a source 12, and a drain 13. The gate 11 is connected to the gate line 40 (scan), the source 12 is connected to the data line 50 (data), and the drain 13 is connected to the pixel electrode 20. Taking a liquid crystal display panel as an example, during the display process, firstly, a gate signal from the gate line 40 is input to the gate 11, turning on the driving transistor 10. Then, a voltage signal from the data line is input to the pixel electrode 20 along the gate 12 and drain 13. The voltage signal applied to the pixel electrode 20 generates a deflection electric field based on the voltage difference between the voltage signal and the common electrode. This deflection electric field acts on the liquid crystal molecules in the liquid crystal layer, causing them to deflect accordingly, adjusting the light transmittance in that area, and thus used for display, achieving corresponding display brightness, contrast, etc.

[0033] See Figure 1 An adjustable resistor 30 is connected between the drain 13 of the driving transistor 10 and the pixel electrode 20. In this structure, the adjustable resistor 30 and the pixel electrode 20 are connected in series. When a voltage signal is applied to the pixel electrode 20 via the drain 13, the adjustable resistor 30 can act as a voltage divider. That is, when the adjustable resistor 30 is provided, the voltage value of the voltage signal applied to the pixel electrode 20 will decrease; and when the resistance value of the adjustable resistor 30 is large, the magnitude of the decrease in the voltage value of the voltage signal applied to the pixel electrode 20 will also be larger, while when the resistance value of the adjustable resistor 30 is small, the magnitude of the decrease in the voltage value of the voltage signal applied to the pixel electrode 20 will also be smaller.

[0034] When a user presses the screen, the pressure applied to the screen is transmitted to the specific pixel structure. In this embodiment, the resistance value of the adjustable resistor 30 is configured to be positively correlated with the applied pressure; specifically, the greater the pressing pressure on the pixel structure, the greater the resistance value of the adjustable resistor 30, and the smaller the pressing pressure on the pixel structure, the smaller the resistance value of the adjustable resistor 30.

[0035] Based on the above settings, by setting the adjustable resistor 30, the voltage signal applied to the pixel electrode 20 can be reduced, thereby reducing the electric field strength generated between the pixel electrode 20 and the common electrode. In this case, the deflection angle of the liquid crystal molecules in the liquid crystal layer decreases, the transmittance of light passing through the pixel structure decreases, and the display brightness of the area where the pixel structure is located decreases. Furthermore, when the pressing pressure on the pixel structure is large, the adjustable resistor 30 has a large resistance value, and the voltage division effect of the adjustable resistor 30 on the pixel electrode 20 is more significant. Ultimately, this can result in a larger reduction in the deflection angle of the liquid crystal molecules in the liquid crystal layer, leading to even lower display brightness in the area where the pixel structure is located. When the display brightness in the area where the pixel structure is located decreases and darkens further with increasing pressing pressure, the white line phenomenon caused by the pressing pressure acting on the liquid crystal molecules in the liquid crystal layer becomes less noticeable, or even eliminated, thereby improving or eliminating trace mura defects.

[0036] When the pressing pressure on the pixel structure is small, the adjustable resistor 30 has a small resistance value. The voltage division effect of the adjustable resistor 30 on the pixel electrode 20 is reduced, which ultimately reduces the deflection angle of the liquid crystal molecules in the liquid crystal layer by a smaller amount. As a result, the reduction in display brightness in the area where the pixel structure is located will be smaller. In this way, while improving the scratch mura defect, it is possible to avoid excessively affecting the display brightness and contrast performance of the area where the pressed pixel structure is located.

[0037] When the pixel structure is not subjected to pressing pressure, the resistance value of the adjustable resistor 30 can be reduced to a minimum (the minimum resistance value of the adjustable resistor 30 can be set to 0). At this time, the voltage division effect of the adjustable resistor 30 on the pixel electrode 20 is smaller or even non-existent. Under this condition, the electric field generated between the pixel electrode 20 and the common electrode can achieve a normal or near-normal electric field strength. Under the action of this electric field, the liquid crystal molecules in the liquid crystal layer can have a normal or near-normal deflection angle, and the area where the pixel structure is located can achieve a normal or near-normal display brightness. This ensures that the area where the pixel structure is located has normal display brightness and contrast performance when it is not pressed, or that the reduction in display performance and quality is within a small range (compared to the case where the voltage signal on the pixel electrode 20 is not divided).

[0038] In one embodiment of the pixel structure, the adjustable resistor 30 is a sliding rheostat with a slider for adjusting its resistance value. In this embodiment, a pressing pressure applied to the pixel structure is applied to the slider, causing it to slide in response to the magnitude of the pressing pressure, thereby adjusting the resistance value of the rheostat. More specifically, when the pressing pressure is large, the slider moves towards a higher resistance value, while when the pressing pressure is small, the slider moves towards a lower resistance value.

[0039] In one embodiment of the pixel structure, the pixel structure further includes guide posts 60, which are used to apply pressure to the slider. Specifically, the guide posts 60 are positioned opposite the slider, and can approach the slider under pressure and reset when the pressure is removed. Specifically, taking a liquid crystal display panel as an example, it includes a first substrate 100 (generally referred to as an array substrate), a second substrate 200 (generally referred to as a color filter substrate), and a liquid crystal layer located between the first substrate 100 and the second substrate 200. Driving transistors 10 and pixel electrodes 20 are disposed on the first substrate 100, and guide posts 60 are disposed on the second substrate 200, and the guide posts 60 can be positioned directly above the slider. In this structure, when the user presses the screen, the pressed second substrate 200 deforms. At this time, the guide post 60 on the second substrate 200 moves towards the slider and acts on the slider during the movement, thereby driving the slider to move. The slider moves in the direction of increasing resistance of the sliding rheostat to achieve a greater voltage division effect on the pixel electrode 20. When the user stops pressing the screen and leaves the screen, the second substrate 200 returns to its normal state from the deformed state. At this time, the guide post 60 moves away from the slider. In this case, the slider returns to its initial position under the action of the guide post 60 or autonomously, which is the position where the resistance of the sliding rheostat is smaller, so as to reduce the voltage division effect of the sliding rheostat on the pixel electrode 20.

[0040] Specifically, in the above embodiments, the guide post 60 can be directly connected to the slider. When the guide post 60 is subjected to pressure, it acts on the slider through physical connection and synchronous movement, causing the slider to move in the direction of increasing resistance.

[0041] In addition, in the above embodiments, the guide post 60 and the slider may not be connected. Instead, the guide post 60 and the slider are spaced apart, with a first magnet 61 at the end of the guide post 60 facing the slider and a second magnet 31 at the end of the slider facing the guide post. The first magnet 61 and the second magnet 31 are arranged to repel each other. Based on the repulsive force between the first magnet 61 and the second magnet 31, the guide post 60 applies the pressure on the pixel structure to the slider. Specifically, in the above structure, when the guide post 60 moves towards the slider, the distance between the first magnet 61 and the second magnet 31 approaches, and the repulsive force between them increases. Under the action of this repulsive force, the slider will move. Furthermore, the direction in which the slider moves due to the increased repulsive force between the first magnet 61 and the second magnet 31 is the direction in which the resistance value increases. This achieves a greater voltage division effect on the pixel electrode 20. When the user stops pressing the screen and the guide post 60 moves away from the slider, the distance between the first magnet 61 and the second magnet 31 increases, and the repulsive force between them decreases. At this time, the slider can be reset and moved to the initial position, which is the position where the resistance value of the sliding rheostat is smaller, so as to reduce the voltage division effect of the sliding rheostat on the pixel electrode 20.

[0042] In the above embodiments, the first magnet 61 and the second magnet 31 can also be configured to have an attractive force rather than a repulsive force between them. In this case, the slider is also configured to move in the direction of increasing resistance due to the increased attractive force between the first magnet 61 and the second magnet 31. Under this structure, when the guide post 60 moves towards the slider, the distance between the first magnet 61 and the second magnet 31 decreases, and the attractive force between them increases. Under this attractive force, the slider moves, and the direction of movement due to the increased attractive force between the first magnet 61 and the second magnet 31 is the direction of increasing resistance, thus achieving a greater voltage division effect on the pixel electrode 20. When the user stops pressing the screen and the guide post 60 moves away from the slider, the distance between the first magnet 61 and the second magnet 31 increases, and the attractive force between them decreases. At this time, the slider can return to its initial position, that is, the position where the resistance of the sliding rheostat is smaller, thereby reducing the voltage division effect of the sliding rheostat on the pixel electrode 20.

[0043] In the above embodiment, the guide post 60 is a spacer (PS post). Spacers are typically provided in liquid crystal display panels, positioned between the first substrate 100 and the second substrate 200, to support the first substrate 100 and the second substrate 200 in the liquid crystal layer, and also to define sub-pixel areas. Using a spacer as the guide post 60 eliminates the need for a dedicated guide post 60, simplifying the structure and reducing costs.

[0044] In summary, the pixel structure provided in the above embodiments of the present invention, by setting an adjustable resistor 30 between the drain 13 of the driving transistor 10 and the pixel electrode 20, with the adjustable resistor 30 and the pixel electrode 20 connected in series, can effectively divide the voltage of the pixel electrode 20. That is, it can reduce the voltage signal applied to the pixel electrode 20, thereby reducing the electric field strength generated between the pixel electrode 20 and the common electrode. In this case, the deflection angle of the liquid crystal molecules in the liquid crystal layer decreases, the transmittance of light passing through the pixel structure decreases, and the display brightness of the area where the pixel structure is located decreases. Furthermore, when the pressing pressure on the pixel structure is large, the adjustable resistor 30 has a large resistance value, and the voltage division effect of the adjustable resistor 30 on the pixel electrode 20 is more significant, ultimately resulting in a larger reduction in the deflection angle of the liquid crystal molecules in the liquid crystal layer, and even lower display brightness in the area where the pixel structure is located. When the display brightness in the area containing the pixel structure decreases and darkens further with increasing pressing pressure, the white lines caused by the pressing pressure acting on the liquid crystal molecules in the liquid crystal layer become less noticeable, or even eliminated, thus improving or eliminating trace mura defects. Simultaneously, when the pressing pressure on the pixel structure is low, the adjustable resistor 30 has a low resistance value, reducing the voltage division effect of the adjustable resistor 30 on the pixel electrode 20. This results in a smaller decrease in the deflection angle of the liquid crystal molecules in the liquid crystal layer, and a smaller decrease in the display brightness in the area containing the pixel structure. This allows for the improvement of trace mura defects without excessively affecting the display brightness and contrast performance of the pressed pixel structure area. Furthermore, when the pixel structure is not subjected to pressing pressure, the resistance value of the adjustable resistor 30 can be reduced to a minimum (the minimum resistance value of the adjustable resistor 30 can be set to 0). At this time, the voltage division effect of the adjustable resistor 30 on the pixel electrode 20 is smaller or even non-existent. Under this condition, the electric field generated between the pixel electrode 20 and the common electrode can achieve a normal or near-normal electric field strength. Under the action of this electric field, the liquid crystal molecules in the liquid crystal layer can have a normal or near-normal deflection angle, and the area where the pixel structure is located can achieve a normal or near-normal display brightness. This ensures that the area where the pixel structure is located has normal display brightness and contrast performance when it is not pressed, or that the reduction in display performance and quality is within a small range (compared to the case where the voltage signal on the pixel electrode 20 is not divided).

[0045] In an embodiment of the display panel of the present invention, the display panel includes the pixel structure described in the above embodiments.

[0046] In this embodiment, the display panel specifically includes a first substrate 100, a second substrate 200, and a liquid crystal layer located between the first substrate 100 and the second substrate 200. That is, the display panel in this embodiment is a liquid crystal display panel, in which driving transistors 10 are formed on the first substrate 100, and spacers are formed on the second substrate 200.

[0047] The display panel in this embodiment includes the pixel structure described in the above embodiments, and naturally has the same beneficial effects as the pixel structure described above, which will not be repeated here.

[0048] In an embodiment of the display device of the present invention, the display device includes the display panel described above.

[0049] The display device in this embodiment can specifically be a mobile phone, television, monitor, laptop computer, tablet computer, and vehicle display terminal, etc.

[0050] The display device in this embodiment includes the display panel described in the above embodiments, and naturally has the same beneficial effects as the display panel described above, which will not be repeated here.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A pixel structure, comprising a driving transistor and a pixel electrode, wherein the drain of the driving transistor is connected to the pixel electrode; characterized in that, An adjustable resistor is connected between the drain of the driving transistor and the pixel electrode, and the resistance value of the adjustable resistor is positively correlated with the applied pressure. The adjustable resistor is a sliding rheostat, which has a slider for adjusting the resistance value of the sliding rheostat. The minimum resistance value of the adjustable resistor is 0; the pixel structure also includes a guide post, which is disposed opposite to the slider and can approach the slider under pressure and reset when the pressure is removed; When the guide post is subjected to pressure, it acts on the slider, causing the slider to move in the direction of increasing resistance.

2. The pixel structure according to claim 1, characterized in that, The guide post and the slider are spaced apart, and a first magnet is provided at one end of the guide post facing the slider, and a second magnet is provided at one end of the slider facing the guide post. The first magnet and the second magnet repel each other, and the slider moves in the direction of increasing resistance due to the increased repulsive force between the first magnet and the second magnet.

3. The pixel structure according to claim 1, characterized in that, The guide post and the slider are spaced apart, and a first magnet is provided at one end of the guide post facing the slider, and a second magnet is provided at one end of the slider facing the guide post. The first magnet and the second magnet attract each other, and the slider moves in the direction of increasing resistance due to the increased attraction between the first magnet and the second magnet.

4. The pixel structure according to any one of claims 1 to 3, characterized in that, The guide post is a spacer.

5. A display panel, characterized in that, The display panel includes the pixel structure described in any one of claims 1 to 4.

6. The display panel according to claim 5, characterized in that, The display panel includes a first substrate, a second substrate, and a liquid crystal layer located between the first substrate and the second substrate. The driving transistor is formed on the first substrate, and a spacer is formed on the second substrate.

7. A display device, characterized in that, The display device includes the display panel as described in claim 6.

Images