Display driving method and display device

Abstract

The invention provides a display driving method and a display device. The display driving method is applied to the display device, a display area of the display panel comprises a plurality of rows of pixels arranged in an array, and the plurality of rows of pixels comprise a target row of pixels located at a second edge; the method comprises the following steps: acquiring a display control signal; the display panel is controlled to display an image according to the display control signal, the working time sequence of the display panel comprises a display time period and a non-display time period which are alternately arranged, and the source voltage variation of the target pixel row is smaller than a preset variation threshold value from the non-display time period to the display time period. According to the display device provided by the embodiment of the invention, the source voltage variation of the target pixel row is smaller than the preset variation threshold value from the non-display time period to the display time period, so that the source voltage jump of the pixel row at the most edge of the display area can be reduced, the possibility of bright spots is reduced, and the display effect is improved.

Description

Technical Field

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

[0002] Ramless IC (no video memory display driver chip) refers to a display driver chip (DDIC) design scheme that removes the display memory (display RAM, referred to as video memory). Since there is no need to set up video memory, this scheme can effectively reduce the driver chip space and cost, and therefore it is attracting more and more attention from users. Figure 1 However, when the display device is in a partial display state, bright spots may appear at the edge of the display area, affecting the display effect. Summary of the Invention

[0003] Embodiments of the present application provide a display driving method and a display device to solve the problem that bright spots may appear at the edge of the existing display area and affect the display effect.

[0004] In a first aspect, embodiments of the present application provide a display driving method, applied to a display device, the display device comprising a display panel and a memory-less display driver chip, the display panel comprising a first edge and a second edge opposite the first edge, the memory-less display driver chip being electrically connected to the display panel on a side proximate to the first edge, the display area of the display panel comprising a plurality of rows of pixels arranged in an array, the plurality of rows of pixels including a target row of pixels located at the second edge;

[0005] Characterized in that the method comprises the following steps:

[0006] Get display control signal;

[0007] The display panel is controlled to display an image according to the display control signal, wherein the operating timing of the display panel includes alternating display periods and non-display periods, and when the source voltage of the target pixel row changes from the non-display period to the display period, the change is less than a preset change threshold.

[0008] In some embodiments, the preset change threshold is less than or equal to 0.4V.

[0009] In some embodiments, controlling the display panel to display an image according to the display control signal includes:

[0010] In the target stage of the non-display period, the source voltage of the target pixel row is controlled to drop to the source voltage corresponding to the next display period, wherein the target stage is the stage adjacent to the non-display period and the next display period, and the duration of the target stage is less than the duration of the non-display period.

[0011] In some embodiments, the duration of the target stage is the duration of writing display data of a pixel row.

[0012] In some embodiments, a dummy pixel row is provided on a side of the target pixel row away from the first edge.

[0013] In some embodiments, the target pixel row is N rows of pixels closest to the second edge, where N is a positive integer.

[0014] In some embodiments, N=1.

[0015] In a second aspect, embodiments of the present application provide a display device comprising a display panel and a memory-less display driver chip, wherein the display panel comprises a first edge and a second edge opposite the first edge, the memory-less display driver chip is electrically connected to the display panel on a side proximate to the first edge, and a display area of the display panel comprises a plurality of rows of pixels arranged in an array, the plurality of rows of pixels including a target row of pixels located at the second edge;

[0016] The display device is configured to perform the following steps:

[0017] Get display control signal;

[0018] The display panel is controlled to display an image according to the display control signal, wherein the operating timing of the display panel includes alternating display periods and non-display periods, and when the source voltage of the target pixel row changes from the non-display period to the display period, the change is less than a preset change threshold.

[0019] In a third aspect, an embodiment of the present application provides a display device comprising a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in any one of the first aspects.

[0020] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method as described in any one of the first aspects are implemented.

[0021] In the display device provided by an embodiment of the present invention, when the source voltage change of the target pixel row is less than the preset change threshold value from the non-display period to the display period, the source voltage jump of the pixel row at the outermost edge of the display area can be reduced, thereby reducing the possibility of bright spots appearing therein, which helps to improve the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 is a schematic diagram of a bright spot of a display device;

[0024] Figure 2 is a flow chart of a display driving method in one embodiment of the present application;

[0025] Figure 3 is a schematic diagram of the arrangement of dummy pixels in one embodiment of the present application;

[0026] Figure 4 It is a structural schematic diagram of a display device in one embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] The terms "first", "second" etc. in the embodiments of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. In addition, the terms "comprise" and "have" and any deformation thereof are intended to cover non-exclusive inclusions, such as, the process, method, system, product or equipment comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or that are intrinsic to these processes, methods, products or equipment. In addition, "and / or" is used in the present application to represent at least one of connected objects, such as A and / or B and / or C, and represents comprising independent A, independent B, independent C, and A and B all exist, B and C all exist, A and C all exist, and 7 situations that A, B and C all exist.

[0029] An embodiment of the present application provides a display driving method.

[0030] The display driving method is applied to a display device, specifically, a Ramless IC display device, which includes a display panel and a Ramless IC display driver chip.

[0031] The display panel includes a first edge and a second edge opposite to the first edge. The Ramless IC is electrically connected to the display panel on a side close to the first edge. The side of the first edge is also called the IC side of the display panel. The display area of the display panel includes multiple rows of pixels arranged in an array. The multiple rows of pixels include a target row of pixels located on the second edge. The second edge side is the side opposite to the IC side of the display panel.

[0032] In some embodiments, the target pixel rows are the N rows of pixels closest to the second edge, where N is a positive integer. For example, when N=2, the target pixel rows are the two rows of pixels closest to the second edge; when N=1, the target pixel rows are the row of pixels closest to the second edge. In some embodiments, N=1, and this embodiment uses N=1 for illustrative purposes only.

[0033] Figure 2 As shown, in one embodiment, the method includes the following steps:

[0034] Step 201: Obtain a display control signal;

[0035] Step 202: Control the display panel to display an image according to the display control signal.

[0036] The working timing of the display panel includes alternating display periods and non-display periods. Here, the non-display period between two adjacent frames of images is also called a porch area. In this embodiment, when the porch area changes to the display period, the source voltage change of the target pixel row is controlled to be less than a preset change threshold.

[0037] In the embodiment of the present application, the display driver chip without video memory is electrically connected to the display panel on the side close to the first edge, and the display area of the display panel includes multiple rows of pixels arranged in an array, and the multiple rows of pixels include the target row of pixels located at the second edge.

[0038] In some embodiments, the preset change threshold is less than or equal to 0.4V. Further, in some embodiments, the preset change threshold can be controlled to be less than or equal to 0.3V. For example, it can be different values such as 0.4V, 0.3V, 0.2V, and 0.1V. By controlling the change in the source voltage to be less than the preset change threshold, the voltage jump of the target pixel row when switching from the porch area to the display area can be reduced, thereby reducing the possibility of bright spots appearing on the display panel.

[0039] In the technical solution of this embodiment, the variation of the source voltage can be controlled in different ways. In one embodiment, this is achieved by reducing the source power supply of the porch area. In this embodiment, the source voltage V1 corresponding to the display area can be determined first, and then the source voltage V2 of the corresponding porch area can be set. For example, the preset variation threshold is set to 0.3V, and the source voltage V2 of the porch area satisfies:

[0040] V2≤V1+0.3V;

[0041] In this way, by reducing the source voltage V2 of the porch area, the fluctuation of the source voltage when the porch area transitions to the display period can be reduced, thereby reducing the possibility of bright spots.

[0042] In some embodiments, controlling the display panel to display an image according to the display control signal includes:

[0043] In the target phase of the non-display period, the source voltage of the target pixel row is controlled to drop to a source voltage corresponding to the next display period.

[0044] In this embodiment, the target phase is the phase between the non-display period and the next display period, and the duration of the target phase is shorter than the duration of the non-display period. In other words, the target phase is the final short period of the porch area. It can be understood that in related art, the source voltage changes when the porch area transitions to the display period, while in the technical solution of this embodiment, the source voltage decreases a period of time in advance when the porch area nears the end of the display period. In this way, when the porch area switches to the display period, the source voltage does not fluctuate violently, thereby affecting the display effect.

[0045] In some embodiments, the duration of the initial stage is the same as the writing time of the display data for a pixel row. In other words, the source voltage is controlled to decrease in advance of the timing corresponding to a row of data. This facilitates the timing control of voltage fluctuations. At the same time, because the source voltage has already dropped to the source voltage corresponding to the next display period, the source power supply does not need to change when transitioning from the porch area to the display period, which means that there will be no fluctuation, thereby reducing the possibility of bright spots.

[0046] like Figure 3 As shown, in some embodiments, a dummy pixel row is provided on the side of the target pixel row away from the first edge. It can be understood that a dummy pixel row is provided at the periphery of the display area, that is, between the target pixel row and the second edge of the display panel. The dummy pixel row can be written with a source voltage but cannot emit light.

[0047] When the timing transitions from the porch area to the display period, source voltage fluctuations occur in the dummy pixel row. Since the dummy pixel row cannot emit light, even if there are source voltage fluctuations, they will not produce bright spots and affect the display effect. When the timing switches from the dummy pixel row to the target pixel row, the fluctuation amplitude is relatively small and does not exceed the preset change threshold, ensuring that the target pixel row does not produce bright spots and affect the display effect.

[0048] An embodiment of the present application further provides a display device, comprising a display panel and a memory-less display driver chip, wherein the display panel comprises a first edge and a second edge opposite the first edge, the memory-less display driver chip is electrically connected to the display panel on a side proximate to the first edge, and a display area of the display panel comprises a plurality of rows of pixels arranged in an array, the plurality of rows of pixels including a target row of pixels located at the second edge;

[0049] The display device is configured to perform the following steps:

[0050] Get display control signal;

[0051] The display panel is controlled to display an image according to the display control signal, wherein the operating timing of the display panel includes alternating display periods and non-display periods, and when the source voltage of the target pixel row changes from the non-display period to the display period, the change is less than a preset change threshold.

[0052] In some embodiments, the preset change threshold is less than or equal to 0.3V.

[0053] In some embodiments, controlling the display panel to display an image according to the display control signal includes:

[0054] In the target stage of the non-display period, the source voltage of the target pixel row is controlled to drop to the source voltage corresponding to the next display period, wherein the target stage is the stage adjacent to the non-display period and the next display period, and the duration of the target stage is less than the duration of the non-display period.

[0055] In some embodiments, the duration of the target stage is the duration of writing display data of a pixel row.

[0056] In some embodiments, the target pixel row is a dummy pixel, and the preset change threshold and the source voltage of the target pixel row are both 0.

[0057] In some embodiments, the target pixel row is N rows of pixels closest to the second edge, where N is a positive integer.

[0058] In some embodiments, N=1.

[0059] The electronic device of this embodiment can implement each step of the above-mentioned display method embodiment and can achieve the same or similar technical effects, which will not be described in detail here.

[0060] like Figure 4 As shown, an embodiment of the present application also provides a display device, including a processor 401, a memory 402, and a program 403 or instruction stored in the memory 402 and executable on the processor. When the program 403 or instruction is executed by the processor 401, the various processes of the above-mentioned method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0061] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0062] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk.

[0063] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0064] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0065] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A display driving method, applied to a display device, the display device comprising a display panel and a memory-less display driver chip, the display panel comprising a first edge and a second edge opposite the first edge, the memory-less display driver chip being electrically connected to the display panel on a side proximate to the first edge, the display area of the display panel comprising a plurality of rows of pixels arranged in an array, the plurality of rows of pixels including a target row of pixels located at the second edge; It is characterized by: The method comprises the following steps: Get display control signal; The display panel is controlled to display an image according to the display control signal, wherein the operating timing of the display panel includes alternating display periods and non-display periods, and when the source voltage of the target pixel row changes from the non-display period to the display period, the change is less than a preset change threshold.

2. The display driving method according to claim 1, wherein: The preset change threshold is less than or equal to 0.4V.

3. The display driving method according to claim 1, wherein: The controlling the display panel to display an image according to the display control signal comprises: In the target stage of the non-display period, the source voltage of the target pixel row is controlled to drop to the source voltage corresponding to the next display period, wherein the target stage is the stage adjacent to the non-display period and the next display period, and the duration of the target stage is less than the duration of the non-display period.

4. The display driving method according to claim 3, wherein: The duration of the target stage is the duration of writing display data of one pixel row.

5. The display driving method according to claim 1, wherein: A dummy pixel row is provided on a side of the target pixel row away from the first edge.

6. The display driving method according to any one of claims 1 to 5, wherein: The target pixel row is N rows of pixels closest to the second edge, where N is a positive integer.

7. The display driving method according to claim 6, wherein: Said N=1.

8. A display device, characterized in that: The device comprises a display panel and a memory-less display driver chip, wherein the display panel comprises a first edge and a second edge opposite to the first edge, the memory-less display driver chip is electrically connected to the display panel on a side proximate to the first edge, and a display area of the display panel comprises a plurality of rows of pixels arranged in an array, wherein the plurality of rows of pixels include a target row of pixels located at the second edge; It is characterized in that the display device is configured to perform the following steps: Get display control signal; The display panel is controlled to display an image according to the display control signal, wherein the operating timing of the display panel includes alternating display periods and non-display periods, and when the source voltage of the target pixel row changes from the non-display period to the display period, the change is less than a preset change threshold.

9. A display device, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method according to any one of claims 1 to 7.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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