Driving method for display device

Abstract

The present invention provides a driving method for driving a first pixel of a display device to display an image in a frame time. The driving method includes dividing the frame time into a first sub-frame time and a second sub-frame time; providing first data having a first grayscale; and controlling the first pixel to emit light in the first sub-frame time or in the second sub-frame time according to the first data. When the first grayscale is greater than a predetermined grayscale, the first pixel is controlled to emit light in the first sub-frame time, and when the first grayscale is less than or equal to the predetermined grayscale, the first pixel is controlled to emit light in the second sub-frame time.

Description

Technical Field

[0001] The present disclosure relates generally to a driving method, and more particularly, to a driving method for a display device. Background Art

[0002] In a display device such as a light emitting diode (LED) display, a desired grayscale is usually displayed by providing a corresponding current or voltage to the LED. However, some LEDs have unstable light emission characteristics. For example, under low driving current conditions, the LED has a lower luminous efficacy, which can cause color difference when displaying low grayscale data. Therefore, it is necessary to improve such problems. Summary of the invention

[0003] Therefore, some embodiments of the present disclosure are directed to a driving method for improving display quality. A frame time is divided into a first subframe time and a second subframe time. First data having a first grayscale is provided. A first pixel is controlled to emit light in the first subframe time or the second subframe time according to the first data. When the first grayscale is greater than a predetermined grayscale, the first pixel is controlled to emit light in the first subframe time, and when the first grayscale is less than or equal to the predetermined grayscale, the first pixel is controlled to emit light in the second subframe time.

[0004] To make the foregoing content more understandable, several embodiments are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this disclosure. The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the embodiments, serve to explain the principles of the present disclosure.

[0006] Figure 1 is a flow chart of a driving method according to an embodiment of the present disclosure;

[0007] Figure 2 A display device according to an embodiment of the present disclosure is shown;

[0008] Figure 3A shows a driving waveform of a driving method according to an embodiment;

[0009] Figure 3B shows the relationship between current and gray scale according to an embodiment of the present disclosure;

[0010] Figure 3C shows a query table according to an embodiment of the present disclosure;

[0011] Figure 3D Pixels according to an embodiment of the present disclosure are shown;

[0012] Figure 4A Another pixel according to an embodiment of the present disclosure is shown;

[0013] Figure 4B Shown corresponding to Figure 4A The driving waveform of the pixel shown in FIG.

[0014] Figure 5A shows a pixel array according to an embodiment of the present disclosure;

[0015] Figure 5B Shown corresponding to Figure 5A The driving waveform of the first row of the pixel array shown in FIG.

[0016] Fig. 6A Another pixel array according to an embodiment of the present disclosure is shown;

[0017] Figure 6B Shown corresponding to Fig. 6A The driving waveform of the first row of the pixel array shown in FIG.

[0018] Fig. 7A and Figure 7B illustrates the operation of the pixel array in a first subframe time and a second subframe time according to an embodiment of the present disclosure;

[0019] Fig. 8A and Figure 8B The operation of the pixel array in the first sub-frame time and the second sub-frame time according to an embodiment of the present disclosure is shown;

[0020] Fig. 9A and Fig. 9B The operation of the pixel array in the first sub-frame time and the second sub-frame time according to an embodiment of the present disclosure is shown;

[0021] Fig. 10A and Fig. 10B The operation of the pixel array in the first sub-frame time and the second sub-frame time according to an embodiment of the present disclosure is shown;

[0022] Fig.11A and Fig. 11B The operation of the pixel array in the first sub-frame time and the second sub-frame time according to an embodiment of the present disclosure is shown.

[0023] Description of Figure Numbers

[0024] 1: Display device;

[0025] 10: Processor;

[0026] 11, 51, 61, 71, 81, 91, 101, 111: pixel array;

[0027] 100: query table;

[0028] 110, EMA11, EMA12, EMA13, EMA14, EMA21, EMA22, EMA23, EMA24, EMA31, EMA32, EMA33, EMA34, EMB12, EMB14, EMB21, EMB22, EMB23, EMB24, EMB32, EMB34, ERA11, ERA13, ERA22, ERA24, ERA31, ERA33, ERA42, ERA44, ERB12, ERB14, ERB21, ERB23, ERB32, ERB34, ERB41, ERB43: pixels;

[0029] C1, C2: capacitors;

[0030] C11, C21: first current level;

[0031] C22: second current level;

[0032] D1: first data;

[0033] DL: data line;

[0034] EM, EMA1, EMA2, EMA3: luminous lines;

[0035] EMA, ERA: first pixel group; EMB, ERB: second pixel group;

[0036] ER: Erase line;

[0037] F1: frame time;

[0038] Gth: predetermined grayscale;

[0039] LD1, LD2: light emitting diodes;

[0040] P1, P2, P3, P4, P5, P6: transistors;

[0041] R1: the first conversion relationship;

[0042] R2: the second conversion relationship;

[0043] S100, 110, 120, 130, 140: steps;

[0044] SC, SC1, SC2, SC3, SC4: scan lines;

[0045] SF1: first subframe time;

[0046] SF2: second subframe time;

[0047] TR1: first lighting cycle;

[0048] TR2: second lighting cycle;

[0049] TR3: the third lighting cycle;

[0050] TR4: The fourth lighting cycle

[0051] VB: black driving voltage;

[0052] Vdd: first reference voltage;

[0053] VD1: first driving voltage;

[0054] VD2: second driving voltage;

[0055] VDL1, VDL2, VSC, VEM, VER: signal;

[0056] Vss: second reference voltage. DETAILED DESCRIPTION

[0057] When read in conjunction with the accompanying drawings, the following embodiments clearly demonstrate the above and other technical contents, features and / or effects of the present disclosure. By elaborating with the aid of specific embodiments, people will further understand the technical methods and effects that the present disclosure adopts to achieve the above-indicated goals. In addition, because the content disclosed herein should be easy to understand and can be implemented by those skilled in the art, the attached claims should cover all equivalent changes or modifications that do not depart from the concepts of the present disclosure.

[0058] Certain terms are used throughout the description and in the following claims to refer to particular components. As will be appreciated by those skilled in the art, electronic device manufacturers may refer to components by different names. This document is not intended to distinguish between components that differ in name but not function.

[0059] In the following description and in the claims, the terms "comprising," "including," and "having" are used in an open-ended fashion, and thus should be interpreted to mean "including, but not limited to . . ."

[0060] It should be understood that when an element or layer is referred to as being “on” or “connected to” another element or layer, it can be directly on or directly connected to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on” or “directly connected to” another element or layer, there are no intervening elements or layers present.

[0061] It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers, parts, and / or sections, these elements, components, regions, layers, parts, and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, part, or section from another region, layer, or section. Therefore, without departing from the teachings of the present disclosure, the first element, component, region, layer, part, or section discussed below may be referred to as a second element, component, region, layer, part, or section.

[0062] The terms "about" and "substantially" typically refer to + / -10% of the stated value, more typically + / -5% of the stated value, more typically + / -3% of the stated value, more typically + / -2% of the stated value, more typically + / -1% of the stated value, and even more typically + / -0.5% of the stated value. The stated values ​​of the present disclosure are approximate values. When there is no specific description, the stated values ​​include the meaning of "about" or "substantially".

[0063] Furthermore, terms such as “connect” or “couple” recited in the specification and claims intend not only direct connections to other elements but also indirect connections and electrical connections to other elements.

[0064] Additionally, features from different embodiments of the disclosure may be combined to form yet another embodiment.

[0065] Figure 1 is a flowchart of a driving method according to an embodiment of the present disclosure. Figure 2 A display device 1 according to an embodiment of the present disclosure is shown. Figure 1 The driving method can be Figure 2 The display device 1 shown in FIG. Figure 2 , the display device 1 includes a processor 10 and a pixel array 11. The pixel array 11 includes a plurality of pixels 110. The processor 10 is electrically connected to at least one pixel 110 in the pixel array 11. According to some embodiments, a driving method is implemented on the driving device 1, so that the processor 10 can control the display of the pixel array 11. The lookup table 100 can be stored in the processor 10. The pixel 110 can include a light-emitting element. The light-emitting element can be a light-emitting diode (LED), a micro-LED, a mini-LED, an organic light-emitting diode (OLED) or a mixture thereof. The display device 1 can be a light-emitting diode display, a micro-LED display, a mini-LED display, an OLED display or an LCD display.

[0066] Figure 1 is a flowchart of a driving method according to an embodiment of the present disclosure. Figure 3A The embodiment according to the present disclosure is shown Figure 1 The driving waveform of the driving method shown in . Figure 1 and Figure 3A , the display device 1 can display an image in the frame time F1. Specifically, the driving method can be applied to drive the pixels of the display device 1 for the pixel array 11 to display the image in the frame time F1. In step S100, the frame time F1 is divided into a first sub-frame time SF1 and a second sub-frame time SF2. According to some embodiments, the first sub-frame time SF1 is before the second sub-frame time SF2. In step 110, first data D1 with a first gray scale is provided. In step 120, the pixel is controlled to emit light in the first sub-frame time SF1 or the second sub-frame time SF2 according to the first data D1. In step 130, when the first gray scale is greater than a predetermined gray scale, the pixel is controlled to emit light in the first sub-frame time SF1. In step 140, when the first gray scale is less than or equal to the predetermined gray scale, the pixel is controlled to emit light in the second sub-frame time SF2.

[0067] Figure 3B The relationship between current and gray scale according to an embodiment of the present disclosure is shown. Figure 3C A query table 100 according to an embodiment of the present disclosure is shown. For example, the query table 100 may be stored in the processor 10. The processor 10 may receive the first data D1. In such an example, the values ​​0 to 255 represent the grayscale corresponding to the first data D1, which should not be understood as the actual voltage or current value applied to drive the pixel 110. Those skilled in the art may change or modify the correlation of the data stored in the query table 100 based on different design concepts and system requirements. For example, the correlation between the data and the grayscale may also include display uneven calibration (mura effect calibration). In such an embodiment of the query table 100, for example, the minimum grayscale and the maximum grayscale are 0 and 255, respectively, and the predetermined grayscale Gth may be 63. The first column of the query table 100 includes a portion of the first grayscale corresponding to the first data D1. The second column and the third column include the current level provided to the pixel in the first subframe time SF1 and the second subframe time SF2.

[0068] Figure 3B Two conversion relationship curves R1 and R2 are shown regarding the relationship between the current level and the gray scale. For example, it can be a linear relationship, but the present disclosure is not limited thereto. Figure 3BAs shown in , the first conversion relationship R1 is different from the second conversion relationship R2. When the first grayscale corresponding to the first data D1 is greater than the predetermined grayscale Gth, the conversion relationship curve R2 is applied, and the current level corresponding to the first grayscale is provided to the pixel according to the conversion relationship curve R2. When the first grayscale corresponding to the first data D1 is less than or equal to the predetermined grayscale Gth, the conversion relationship curve R1 is applied, and the current level corresponding to the first grayscale is provided to the pixel according to the conversion relationship curve R1. According to some embodiments, the second conversion relationship R2 may have a slope greater than the first conversion relationship R1.

[0069] When the first grayscale of the first data D1 is greater than the predetermined grayscale Gth (for example, 63), the corresponding current level (first current level) according to the first conversion relationship R1 is high enough to provide good luminous efficacy. Therefore, according to some embodiments, when the first grayscale of the first data D1 is greater than the predetermined grayscale Gth, the first current level corresponding to the first grayscale according to the first conversion relationship R1 is provided to the pixel in the first subframe time SF1. Specifically, for example, when the first grayscale is 191 (greater than 63), the first current level C11 corresponding to the grayscale 191 according to the first conversion relationship R1 may be provided to the pixel in the first subframe time SF1, as shown in FIG. Figure 3C As shown in the lookup table 100 in FIG. In addition, for the convenience of explanation, the predetermined gray scale Gth 63 is only an example, and the present disclosure is not limited thereto.

[0070] However, according to the conversion relationship R1, when the grayscale is low (for example, lower than the predetermined grayscale Gth), the corresponding current level according to the first conversion relationship R1 is low. Since the light-emitting element generally has an unstable display characteristic when the driving current is low, driving the pixel with a relatively low current may produce severe color difference. Therefore, according to some embodiments, when the current converted according to the first grayscale of the first data is less than or equal to the predetermined current level, a second current level corresponding to the first grayscale according to another conversion relationship, such as the second conversion relationship R2, may be provided to the pixel in the second subframe time SF2. For example, when the grayscale is less than or equal to the predetermined grayscale Gth, such as grayscale 63, the current C21 corresponding to grayscale 63 according to the first conversion relationship R1 may be too low, where the light-emitting characteristic is generally unstable. According to some embodiments, under lower grayscale conditions, in order to obtain a higher current, a current following the second conversion relationship R2 may be provided to the pixel. Specifically, when the grayscale is less than or equal to the predetermined grayscale Gth, such as grayscale 63, a second current level C22 corresponding to the first grayscale according to the second conversion relationship R2 may be provided to the pixel in the second subframe time SF2. Figure 3B As shown in FIG. 6 , for gray scale 63, the current C22 (second current level) according to the second conversion relationship R2 is greater than the current C21 according to the first conversion relationship R1. Figure 3B as well as Figure 3C As shown in the third column of FIG. 1 , the current C22 corresponding to the gray scale 63 according to the second conversion relationship R2 may be at the same level as the current corresponding to the gray scale 255 according to the first conversion relationship R1 , but the present invention is not limited thereto.

[0071] According to some embodiments, the pixel may be controlled to emit light in the second light-emitting period TR2 in the second subframe time SF2, and the time length of the first light-emitting period TR1 may be different from the time length of the second light-emitting period TR2. According to some embodiments, for the same gray scale, the current level C22 according to the second conversion relationship R2 may be greater than the current level C21 according to the first conversion relationship R1. According to some embodiments, to ensure brightness, the pixel may be driven by the second current level C22 having a shorter light-emitting period. That is, the time length of the second light-emitting period TR2 may be shorter than the time length of the first light-emitting period TR1.

[0072] According to some embodiments, the time length of the first light-emitting period TR1 may be greater than the time length of the second light-emitting period TR2. For example, the time length of the first light-emitting period TR1 may be a multiple of the time length of the second light-emitting period TR2, for example, the multiple may be in the range of 1.5 to 8, in the range of 2 to 6, in the range of 3 to 5, or in the range of 3.5 to 4.5.

[0073] The average brightness intensity is approximately determined by the product of the driving current and the light-emitting time of the light-emitting device. Therefore, the current level C22 of the second conversion relationship R2 can be designed to correspond to the current level C21 of the first conversion relationship R1 and the ratio between the length of the first light-emitting period TR1 and the length of the second light-emitting period TR2. For example, in the case where the time length of the second light-emitting period TR2 is 1 / 4 of the time length of the first light-emitting period TR1, the current level C22 can be designed to be 4 times the current level C21. According to the target current level in the lower gray scale, the ratio between the length of the first light-emitting period TR1 and the length of the second light-emitting period TR2 can be determined as needed.

[0074] The grayscale represented by a pixel conforms to the following equation:

[0075] The displayed gray scale = driving current × length of the light emitting period.

[0076] Therefore, when the first gray scale of the first data D1 is greater than the predetermined gray scale Gth, the pixel is controlled to emit light in the longer first light emission period TR1 in the first subframe time SF1. When the first gray scale of the first data D1 is less than or equal to the predetermined gray scale Gth, the pixel is controlled to emit light in the shorter second light emission period TR2 in the second subframe time SF2.

[0077] In one embodiment, the slope of the conversion relationship curve R2 may be approximately four times the slope of the conversion relationship curve R1. Correspondingly, the second light-emitting period TR2 may be approximately one-fourth of the first light-emitting period TR1. That is, the processor 10 may control the pixel 110 to emit light in the first subframe time SF1 to represent a grayscale greater than the predetermined grayscale Gth according to the conversion relationship curve R2, and the processor 10 may control the pixel 110 to emit light in the first subframe time to represent a grayscale less than or equal to the predetermined grayscale Gth according to the conversion relationship curve R1. Therefore, the display device 1 can effectively avoid driving the pixel 110 at a relatively low current level.

[0078] In brief, according to some embodiments, the display device 1 divides the frame time F1 into a first sub-frame time SF1 and a second sub-frame time SF2 having different light-emitting period lengths. The pixel 110 is controlled to display in one of the first sub-frame time SF1 and the second sub-frame time SF2 of the frame time F1. When the processor 10 determines that the first gray scale corresponding to the first data D1 is greater than the predetermined gray scale Gth, the first current level is provided to the pixel in the first light-emitting period TR1 in the first sub-frame time SF1, and according to the conversion relationship R1, the first current level corresponds to the first gray scale. When the processor determines that the first gray scale corresponding to the first data D1 is less than or equal to the predetermined gray scale Gth, the second current level corresponding to the second conversion relationship R2 may be provided to the pixel in the second light-emitting period TR2 in the second sub-frame time SF2. In some embodiments, the time length of the second light-emitting period TR2 may be shorter than the time length of the first light-emitting period TR1.

[0079] Therefore, according to some embodiments, when the gray scale of the data is less than or equal to the predetermined gray scale Gth, the current level can follow the second conversion relationship R2 to obtain a higher current level, and the higher current level can be provided to the pixel in a shorter length of the light emitting period in the second subframe time. Therefore, the display image quality of the display device in low gray scale can be effectively improved.

[0080] Figure 3D FIG. 1 shows a pixel 110 according to an embodiment of the present disclosure. Figure 1As shown in , the pixel 110 can be arranged in the pixel array 11. The pixel 110 includes a transistor P1, a transistor P2, a transistor P3, a light emitting diode (LED) LD1, and a capacitor C1. The transistor P1, the transistor P2, and the LED LD1 are connected in series between a first reference voltage Vdd and a second reference voltage Vss. In such embodiments, the transistor P1 is directly connected to the first reference voltage Vdd, the LED LD1 is directly connected to the second reference voltage Vss, and the transistor P2 is connected between the transistor P1 and the LED LD1. The transistor P3 is connected between the data line DL and the control terminal of the transistor P1. The scan line SC is connected to the control terminal of the transistor P3. The luminous line EM is connected to the control terminal of the transistor P2. The capacitor C1 is connected between the first reference voltage Vdd and the control terminal of the transistor P1.

[0081] refer to Figure 3A and Figure 3D , signal VSC and signal VEM are voltage signals transmitted on the scan line SC and the light emitting line EM, respectively. When it is determined that the first gray scale is greater than the predetermined gray scale Gth, signal VDL1 is a voltage signal transmitted on the data line DL. When it is determined that the first gray scale is less than or equal to the predetermined gray scale Gth, signal VDL2 is a voltage signal transmitted on the data line DL.

[0082] like Figure 3A As can be seen from the figure, the frame time F1 is divided into the first sub-frame time SF1 and the second sub-frame time SF2. At the beginning of the first sub-frame time SF1 and the second sub-frame time SF2, the signal VSC is switched to a low voltage level and the transistor P3 is turned on, so the data transmitted from the data line DL is stored in the capacitor C1. Subsequently, the signal VEM is switched to a low voltage level and the transistor P2 is turned on in the first light-emitting period TR1 and the second light-emitting period TR2, so the LED LD1 is driven by the transistor P1 according to the data stored in the capacitor C1. In other words, the first light-emitting period TR1 and the second light-emitting period TR2 are the light-emitting periods of the first sub-frame time SF1 and the second sub-frame time SF2, respectively.

[0083] refer to Figure 3A and Figure 3C, when the first gray scale is greater than the predetermined gray scale Gth, the first driving voltage VD1 is provided to the pixel in the first subframe time SF1, wherein the transistor P1 is controlled by the first driving voltage VD1 to provide a first current level corresponding to the first data D1 according to the second conversion relationship curve R2. Therefore, by driving the LED LD1 with the first current level in the first light emitting period TR1, the first gray scale can be represented by the pixel. Black data for turning off the light emitting device can be provided to the first pixel in the second subframe time SF2. Specifically, the black driving voltage VB can be provided to the pixel in the second subframe time SF2, so the transistor P1 can provide a black driving current to the LED LD1 in the second subframe time SF2. The LED LD1 can be cut off according to the black driving current. More specifically, when the first gray scale is 191, the initial first current level corresponding to the gray scale 191 is provided to the pixel in the first subframe time SF1, and the black driving voltage VB can be provided to the pixel in the second subframe time SF2.

[0084] When the first gray scale is less than or equal to the predetermined gray scale Gth (e.g., gray scale 63), the second driving voltage VD2 is provided to the pixel so as to provide a second current level C22 corresponding to the first gray scale 63 according to the second conversion relationship R2 in the second subframe time SF2. By driving the LED LD1 at the second current level in the first light emission period TR2, the second gray scale can be represented by the pixel. The black driving voltage VB can be provided to the pixel in the first subframe time SF1 to control the cutoff of the LED LD1.

[0085] Figure 4A Another pixel 110 according to an embodiment of the present disclosure is shown. Pixel 110 includes a transistor P4, a transistor P5, a transistor P6, a light emitting diode (LED) LD2, and a capacitor C2. Transistor P4 and LED LD2 are connected in series between a first reference voltage Vdd and a second reference voltage Vss. In such embodiments, transistor P4 is directly connected to the first reference voltage Vdd, and LED LD2 is directly connected to the second reference voltage Vss. Transistor P5 is connected between a data line DL and a control terminal of transistor P4. A scan line SC is connected to a control terminal of transistor P5. Transistor P6 is connected between a first reference voltage Vdd and a control terminal of transistor P4. The control terminal of transistor P6 is connected to an erase line ER. Capacitor C2 is connected between a first reference voltage Vdd and a control terminal of transistor P4.

[0086] Figure 4B Shown corresponding to Figure 4A1. The driving waveform of the pixel 110 shown in FIG. 1. The signal VSC and the signal VER are voltage signals transmitted on the scan line SC and the erase line ER, respectively. When it is determined that the first gray scale is greater than the predetermined gray scale, the signal VDL1 is a voltage signal transmitted on the data line DL. When it is determined that the first gray scale is less than or equal to the predetermined gray scale, the signal VDL2 is a voltage signal transmitted on the data line DL.

[0087] Except for Figure 4B The erase signal VER in the Figure 3A In addition to the luminous signal VEM, Figure 4B The operating waveform shown in Figure 3A The operating waveforms shown in are similar.

[0088] At the beginning of the first subframe time SF1 and the second subframe time SF2, the signal VSC is switched to a low voltage level and the transistor P5 is turned on, so the data transmitted from the data line DL is passed to the control terminal of the transistor P4. Subsequently, the signal VER is switched to a high voltage level and the transistor P6 is cut off during the first light-emitting period TR1 and the second light-emitting period TR2, so that the data transmitted from the data line DL is stored in the capacitor C2. In addition, the transistor P4 is driven by the data stored in the capacitor C2 during the first light-emitting period TR1 and the second light-emitting period TR2, so that the corresponding current level is provided to the LED LD2. Therefore, the LED LD2 is displayed during the first light-emitting period TR1 and the second light-emitting period TR2. Due to Figure 3A and Figure 4B The first driving voltage VD1, the second driving voltage VD2 and the black driving voltage VB are similar, so please refer to the relevant paragraphs for specific operations in the above text, which are omitted in this article.

[0089] It should be noted that Figure 3A and Figure 4B The black driving voltage VB shown in FIG. 1 is for exemplary purposes only and should not be used to limit the scope of the present disclosure. Of course, those skilled in the art may modify or change the black driving voltage VB according to different design concepts and system requirements.

[0090] Figure 5A A pixel array 51 according to an embodiment of the present disclosure is shown. The pixels in the pixel array 51 are divided into a first pixel group EMA and a second pixel group EMB. Each pixel of the first pixel group EMA and the second pixel group EMB can be arranged alternately in the row direction and the column direction. For example, the pixel EMA22 is arranged adjacent to the pixel EMB21 and the pixel EMB23 along the row direction, and the pixel EMA22 is arranged adjacent to the pixel EMB12 and the pixel EMB32 in the column direction.

[0091] Figure 5B Shown corresponding to Figure 5A . Specifically, the pixels of the first pixel group EMA have a longer light emission period in the first subframe time SF1, but have a shorter light emission period in the second subframe time SF2. On the other hand, the pixels of the second pixel group EMB have a shorter light emission period in the first subframe time SF1, but have a longer light emission period in the second subframe time SF2.

[0092] Taking the pixel EMA11 (eg, the first pixel EMA11) and the pixel EMB12 (eg, the second pixel EMB12) in the first row of the pixel array 51 as an example, the driving method of the first pixel EMA11 is the same as that of the first pixel EMA11. Figure 3A The driving method shown and described in is similar. That is, when the gray scale of the first data D1 is greater than the predetermined gray scale, the first pixel EMA11 is controlled to emit light in the first light emission period TR1 in the first subframe time SF1. The first current level following the first conversion relationship R1 is provided to the pixel EMA11 in the second subframe time SF2. When the gray scale of the first data is less than or equal to the predetermined gray scale, the first pixel EMA11 is controlled to emit light in the second light emission period TR2 in the second subframe time SF2. The second current level following the second conversion relationship R2 is provided to the first pixel EMA11 in the second subframe time SF2. The time length of the second light emission period TR2 may be shorter than the time length of the first light emission period TR1.

[0093] refer to Figure 5B , regarding the second pixel EMB12, second data having a second grayscale is provided to drive the second pixel EMB12 of the display device 1. When the second grayscale of the second data is greater than the predetermined grayscale, a third current level is provided to the second pixel EMB12 in the third light emission period TR3 in the second subframe time SF2, and according to the first conversion relationship R1, the third current level corresponds to the second grayscale. A black driving voltage may be provided to the second pixel EMB12 in the first subframe time SF1.

[0094] refer to Figure 5B , when the current converted according to the second gray scale is less than or equal to the predetermined current level, the second pixel EMB12 is controlled to emit light in the fourth light emission period TR4 in the first subframe time SF1. The fourth current level corresponding to the second gray scale according to the second conversion relationship R2 may be provided to the second pixel EMB12 in the first subframe time SF1. The black driving voltage VB may be provided to the second pixel EMB12 in the second subframe time SF2. Black data or a black current level may be provided to the second pixel EMB12. According to some embodiments, the time length of the fourth light emission time TR4 may be shorter than the time length of the third light emission time TR3.

[0095] According to some embodiments, by means of Figure 5B In the driving method, when adjacent pixels have similar grayscales (e.g., a higher grayscale greater than a predetermined grayscale), two adjacent pixels may emit light in different subframe times. Specifically, when the grayscale of the data is provided to the first pixel EMA11 and the second pixel EMB12 is greater than the predetermined grayscale, the two adjacent pixels emit light in different subframe times. That is, the first pixel EMA11 emits light in the first subframe time SF1 and the second pixel EMB12 emits light in the second subframe time SF2. Therefore, in some embodiments, the flicker problem can be effectively alleviated. In addition, in some embodiments, the power demand of the display device 1 can be reduced.

[0096] Fig. 6A Another pixel array 61 according to an embodiment of the present disclosure is shown. Fig. 6A The pixels in can be Figure 4A . The pixels in the pixel array 61 are divided into a first pixel group ERA and a second pixel group ERB. Each pixel of the first pixel group ERA and the second pixel group ERB may be arranged alternately in the row direction and the column direction. For example, the pixel ERA22 is arranged adjacent to the pixel ERB21 and the pixel ERB23 in the row direction, and the pixel ERA22 is arranged adjacent to the pixel ERB12 and the pixel ERB32 in the column direction.

[0097] Figure 6B Shown corresponding to Fig. 6A . Specifically, the pixels of the first pixel group ERA have a longer light emission period in the first subframe time SF1, but have a shorter light emission period in the second subframe time SF2. On the other hand, the pixels of the second pixel group ERB have a shorter light emission period in the first subframe time SF1, but have a longer light emission period in the second subframe time SF2. Figure 5A and Fig. 6A Share a similar pixel arrangement, so please refer to the relevant paragraphs above for specific operations, which are omitted in this article.

[0098] However, the pixels of the first pixel group EMA and the second pixel group EMB are not limited to Figure 5A and Fig. 6A Those skilled in the art may modify or alter the pixel array 11, pixel array 51, pixel array 61 and display device 1 described above according to different design concepts or system requirements.

[0099] Fig. 7A and Figure 7BThe operation of the pixel array 71 in the first subframe time SF1 and the second subframe time SF2 according to an embodiment of the present disclosure is shown. In such an embodiment, only the pixels EMA11 to EMA34 of the first pixel group EMA are used. That is, all pixels in the pixel array 71 have the same length of light-emitting period in the first subframe time SF1 and the same length of light-emitting period in the second subframe time SF2. In addition, the average grayscale displayed by all pixels in the first subframe time SF1 is greater than the predetermined grayscale value, and the average grayscale displayed by all pixels in the second subframe time SF2 is less than or equal to the predetermined grayscale value.

[0100] Scanning line SC1 and emission line EMA1 are connected to pixels EMA11 to EMA14 of the first row. Scanning line SC2 and emission line EMA2 are connected to pixels EMA21 to EMA24 of the second row. Scanning line SC3 and emission line EMA3 are connected to pixels EMA31 to EMA34 of the third row.

[0101] Therefore, in Fig. 7A During the first subframe time SF1 shown in FIG. 1 , the pixels EMA11 to EMA34 have a longer light emission period and display data at a grayscale greater than a predetermined grayscale. Figure 7B During the second subframe time SF2 shown in FIG. 8 , the pixels EMA11 to EMA34 have a light emitting period of a shorter length having a gray scale less than or equal to a predetermined gray scale.

[0102] Fig. 8A and Figure 8B The operation of the pixel array 81 in the first subframe time SF1 and the second subframe time SF2 according to an embodiment of the present disclosure is shown. In such an embodiment, pixels of the first pixel group EMA and the second pixel group EMB are used. Specifically, the pixels of the first pixel group EMA and the second pixel group EMB are arranged in different rows of the pixel array 81, and the rows formed by the first pixel group EMA and the rows formed by the second pixel group EMB are arranged alternately. Therefore, each pixel of the first pixel group EMA is arranged adjacent to at least one pixel of the second pixel group EMB in the column direction. Taking the pixel EMA11 (e.g., the first pixel EMA11) and the pixel EMB21 (e.g., the second pixel EMB21) as an example, the second pixel EMB21 is arranged adjacent to the first pixel EMA11 in the column direction. In addition, the average grayscale displayed by the first pixel EMA11 is greater than the predetermined grayscale value in the first subframe time SF1, and the average grayscale displayed by the second pixel EMB21 in the first subframe time SF1 is less than or equal to the predetermined grayscale value, and vice versa.

[0103] Specifically, in Fig. 8ADuring the first subframe time SF1 shown in FIG, pixels EMA11 to EMA14 and pixels EMA31 to EMA34 of the first and third rows have a longer light-emitting period and display data at a grayscale greater than a predetermined grayscale in the first subframe time SF1. Pixels EMB21 to EMB24 of the second row have a shorter light-emitting period and when the grayscale is less than or equal to the predetermined grayscale in the first subframe time SF1, a current level following the second conversion relationship R2 can be provided to pixels EMB21 to EMB24. In FIG. Figure 8B During the second subframe time SF2 shown in , pixels EMA11 to EMA14, pixels EMA31 to EMA34 of the first and third rows have a shorter light-emitting period and when the grayscale is less than or equal to a predetermined grayscale in the second subframe time SF2, a current level following the second conversion relationship R2 can be provided to pixels EMA11 to EMA14, pixels EMA31 to EMA34, and pixels EMB21 to EMB24 of the second row have a longer light-emitting period and display data at a grayscale greater than the predetermined grayscale in the second subframe time SF2.

[0104] Fig. 9A and Fig. 9B The operation of the pixel array 91 in the first subframe time SF1 and the second subframe time SF2 according to an embodiment of the present disclosure is shown. In such an embodiment, pixels of the first pixel group EMA and the second pixel group EMB are used. Specifically, the pixels of the first pixel group EMA and the second pixel group are arranged in different columns of the pixel array 91, and the columns formed by the first pixel group EMA and the columns formed by the second pixel group EMB are arranged alternately. Therefore, each pixel of the first pixel group EMA is arranged adjacent to at least one pixel of the second pixel group EMB in the row direction. Taking the pixel EMA11 (e.g., the first pixel EMA11) and the pixel EMB12 (e.g., the second pixel EMB12) as an example, the second pixel EMB12 is arranged adjacent to the first pixel EMA11 in the row direction. In addition, the average grayscale displayed by the first pixel EMA11 is greater than the predetermined grayscale value in the first subframe time SF1, and the average grayscale displayed by the second pixel EMB21 in the first subframe time SF1 is less than or equal to the predetermined grayscale value, and vice versa.

[0105] Therefore, in Fig. 9ADuring the first subframe time SF1 shown in , the pixels EMA11 to EMA31 and EMA13 to EMA33 of the first and third columns have a longer light-emitting period and display data at a grayscale greater than a predetermined grayscale, and the pixels EMB12 to EMB32 and EMB14 to EMB34 of the second and fourth columns have a shorter light-emitting period, and when the grayscale is less than or equal to the predetermined grayscale, the current level following the second conversion relationship R2 can be provided to the pixels EMB12 to EMB32 and the pixels EMB14 to EMB34. In the example Fig. 9B During the second subframe time SF2 shown in , pixels EMA11 to EMA31 and pixels EMA13 to EMA33 in the first and third columns have a shorter light-emitting period, and when the grayscale is less than or equal to a predetermined grayscale, a current level following the second conversion relationship R2 can be provided to pixels EMA11 to EMA31 and pixels EMA13 to EMA33, and pixels EMB12 to EMB32 and pixels EMB14 to EMB34 in the second and fourth columns have a longer light-emitting period and display data at a grayscale greater than the predetermined grayscale.

[0106] Fig. 10A and Fig. 10B The operation of the pixel array 101 in the first subframe time SF1 and the second subframe time SF2 according to an embodiment of the present disclosure is shown. In such embodiments, pixels of the first pixel group EMA and the second pixel group EMB are used. Specifically, the pixels of the first pixel group EMA and the second pixel group EMB can be arranged alternately in the row direction and the column direction. Taking the pixel EMA22 (e.g., the first pixel EMA22) and the pixel EMB12, the pixel EMB21, the pixel EMB23, the pixel EMB32 (e.g., the second pixel EMB12, the second pixel EMB21, the second pixel EMB23, the second pixel EMB32) as an example, the first pixel EMA22 is arranged adjacent to the second pixel EMB12, the second pixel EMB21, the second pixel EMB23, the second pixel EMB32 in the row direction and the row direction. In addition, the light emission period length of the first pixel EMA22 is different from the light emission period length of the second pixel EMB12, the second pixel EMB21, the second pixel EMB23, the second pixel EMB32. In addition, the average grayscale displayed by the first pixel EMA22 is greater than the predetermined grayscale value in the first subframe time SF1, and the average grayscale displayed by the second pixels EMB12, EMB21, EMB23, and EMB32 in the first subframe time SF1 is less than or equal to the predetermined grayscale value, and vice versa.

[0107] Therefore, in Fig. 10ADuring the first subframe time SF1 shown in , pixels EMA11, EMA13, EMA22, EMA24, EMA31, and EMA33 have a longer light-emitting period and display data at a grayscale greater than a predetermined grayscale, and pixels EMB12, EMB14, EMB21, EMB23, EMB32, and EMB34 have a shorter light-emitting period, and when the grayscale is less than or equal to the predetermined grayscale, a current level following the second conversion relationship R2 can be provided to pixels EMB12, EMB14, EMB21, EMB23, EMB32, and EMB34. Fig. 10B During the second subframe time SF2 shown in , pixels EMA11, EMA13, EMA22, EMA24, EMA31, and EMA33 have a shorter light-emitting period and when the grayscale is less than or equal to a predetermined grayscale, a current level following the second conversion relationship R2 can be provided to pixels EMA11, EMA13, EMA22, EMA24, EMA31, and EMA33, and pixels EMB12, EMB14, EMB21, EMB23, EMB32, and EMB34 have a longer light-emitting period and display data at a grayscale greater than the predetermined grayscale.

[0108] Fig.11A and Fig. 11B 1 and 2 show the operation of the pixel array 111 in the first subframe time SF1 and the second subframe time SF2 according to an embodiment of the present disclosure. In addition to the different arrangements of the scanning lines and the emission lines of the pixel array 111 and the pixel array 101, as shown in FIG. Fig.11A and Fig. 11B The pixel array 111 shown in FIG. Fig. 10A and Fig. 10B101 is similar to the pixel array 101 shown in . In such an embodiment, only one luminous line is arranged between each row of the pixel array 111. Specifically, the scan line SC1 and the luminous line EMA1 are arranged on the top of the pixel array 111 and are connected to the pixels EMA11 and EMA13 of the first pixel group EMA in the first row. The scan line SC2 and the luminous line EMB2 are arranged between the first and second rows of the pixel array 111 and are connected to the pixels EMB12, EMB14, EMB21, and EMB23 of the second pixel group EMB in the first and second rows. The scan line SC3 and the luminous line EMA3 are arranged between the second and third rows of the pixel array 111 and are connected to the pixels EMA22, EMA24, EMA31, and EMA33 of the first pixel group EMA in the second and third rows. The scan line SC4 and the luminous line EMB4 are arranged on the bottom of the pixel array 111 and are connected to the pixels EMB32 and EMB34 of the second pixel group EMB in the third row. Taking the first and second rows in the pixel array 111 as an example, only one emission line EMB2 is arranged between the first and second rows of the pixel array 111. Specifically, the emission line EMB2 can be shared by pixels EMB12, EMB14, EMB21, and EMB23 of the second pixel group EMB in the first and second rows. Therefore, the number of total signal lines can be effectively reduced, thereby saving area consumption of the pixel array 111.

[0109] The operation of the pixel array 111 in the first subframe time SF1 and the second subframe time SF2 is similar to that of the pixel array 101 , so please refer to the corresponding paragraphs about the pixel array 101 in the above details, which are omitted in this article.

[0110] In general, according to some embodiments, the frame time of the display device is divided into a first subframe time and a second subframe time. The pixels in the display device are controlled to emit light in the first subframe time or the second subframe time with different light emission period lengths. According to some embodiments, when the gray scale of the data is less than or equal to the predetermined gray scale, the current level may follow the second conversion relationship to obtain a higher current level, and the higher current level may be provided to the pixel in the second subframe time within a shorter length of the light emission period. Therefore, the display image quality of the display device in low gray scales can be effectively improved.

Claims

1. A driving method, adapted to drive a first pixel and a second pixel of a display device to display an image in a frame time, wherein the first pixel and the second pixel are arranged adjacent to each other, the driving method comprising: dividing the frame time into a first subframe time and a second subframe time; providing first data having a first grayscale to the first pixel; providing second data having a second gray scale to the second pixel; controlling the first pixel to emit light in the first subframe time or the second subframe time according to the first data, wherein when the first grayscale is greater than a predetermined grayscale, the first pixel is controlled to emit light in the first subframe time, and when the first grayscale is less than or equal to the predetermined grayscale, the first pixel is controlled to emit light in the second subframe time; as well as The second pixel is controlled to emit light in the first subframe time or the second subframe time according to the second data, wherein when the second grayscale is greater than the predetermined grayscale, the second pixel is controlled to emit light in the second subframe time, and when the second grayscale is less than or equal to the predetermined grayscale, the second pixel is controlled to emit light in the first subframe time.

2. The driving method according to claim 1 , wherein the step of controlling the first pixel to emit light in the first sub-frame time or the second sub-frame time according to the first data comprises: When the first gray scale is greater than the predetermined gray scale, controlling the first pixel to emit light in a first light-emitting period during the first subframe time, and When the first gray scale is less than or equal to the predetermined gray scale, the first pixel is controlled to emit light in a second light emission period in the second subframe time, wherein a time length of the first light emission period is different from a time length of the second light emission period. 3 . The driving method according to claim 2 , wherein a time length of the second light emitting period is shorter than a time length of the first light emitting period.

4. The driving method according to claim 1 , wherein the step of controlling the first pixel to emit light in the first sub-frame time or the second sub-frame time according to the first data comprises: When the first grayscale of the first data is greater than the predetermined grayscale, providing a first current level corresponding to the first grayscale according to a first conversion relationship to the first pixel in the first subframe time, and When the first grayscale of the first data is less than or equal to the predetermined grayscale, a second current level corresponding to the first grayscale according to a second conversion relationship is provided to the first pixel in the second subframe time, wherein the first conversion relationship is different from the second conversion relationship.

5. The driving method according to claim 1 , wherein the step of controlling the second pixel to emit light in the first subframe time or the second subframe time according to the second data comprises: When the second gray scale is greater than the predetermined gray scale, controlling the second pixel to emit light in a third light-emitting period during the second subframe time, and When the second gray scale is less than or equal to the predetermined gray scale, the second pixel is controlled to emit light in a fourth light emitting period in the first subframe time, wherein a time length of the third light emitting period is different from a time length of the fourth light emitting period. 6 . The driving method according to claim 5 , wherein a time length of the fourth light emitting period is shorter than a time length of the third light emitting period.

7. The driving method according to claim 1 , wherein the step of controlling the second pixel to emit light in the first subframe time or the second subframe time according to the second data comprises: When the second gray scale of the second data is greater than the predetermined gray scale, a third current level corresponding to the second gray scale according to the first conversion relationship is provided to the second pixel in the second subframe time, and When the second grayscale of the second data is less than or equal to the predetermined grayscale, a fourth current level corresponding to the second grayscale according to a second conversion relationship is provided to the second pixel in the first subframe time, wherein the first conversion relationship is different from the second conversion relationship. 8 . The driving method according to claim 1 , wherein the second pixel is disposed adjacent to the first pixel along a column direction. 9 . The driving method according to claim 1 , wherein the second pixel is disposed adjacent to the first pixel along a row direction. 10 . The driving method according to claim 4 , wherein when the first gray scale of the first data is greater than the predetermined gray scale, black data is provided to the first pixel in the second sub frame time. 11 . The driving method according to claim 4 , wherein when the first gray scale of the first data is less than or equal to the predetermined gray scale, black data is provided to the first pixel in the first sub frame time.

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