Driving circuit, display device including the same, and driving method

Abstract

This invention discloses a driving circuit and a display device and driving method including the same. The driving circuit according to an embodiment of the invention is applied to driving a display panel, including a data voltage unit for writing display data voltage; and a switching unit connected to the data voltage unit, wherein, at a first moment, the data voltage unit is turned on to write the display data voltage; at a second moment, the data voltage unit is turned off; the first moment is earlier than the second moment; and at a third moment, earlier than the second moment, the switching unit is turned on to illuminate the light source corresponding to the display data voltage. The driving circuit and the display device and driving method including the same according to an embodiment of the invention can avoid the influence of feedthrough effect in the driving circuit on the display data voltage, achieving more accurate image display.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a driving circuit and a display device and driving method including the same. Background Technology

[0002] Display panels typically require driver circuitry to provide power and signals to control the brightness and color of each pixel.

[0003] In existing driving circuits, there is often a parasitic capacitance between the switching circuit section that controls pixel brightness and color and the data voltage circuit section, which will produce a feedthrough effect, thereby affecting the accuracy of the data voltage and thus affecting the display effect of the display panel.

[0004] Therefore, it is desirable to have a new driving circuit and a display device and driving method that include the same, which can overcome the above problems. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a driving circuit and a display device and driving method including the same, thereby avoiding the influence of feedthrough effect in the driving circuit on the display data voltage and displaying the screen more accurately.

[0006] According to one aspect of the present invention, a driving circuit is provided for driving a display panel, comprising:

[0007] Data voltage unit, used to write display data voltage; and

[0008] The switching unit connected to the data voltage unit,

[0009] Specifically, at a first moment, the data voltage unit is turned on to write the display data voltage; at a second moment, the data voltage unit is turned off; the first moment is earlier than the second moment.

[0010] At a third moment earlier than the second moment, the switching unit is turned on to illuminate the light source corresponding to the display data voltage.

[0011] Optionally, the driving circuit further includes:

[0012] A control unit, connected to the data voltage unit to control the switching on and off of the data voltage unit; the control unit is also connected to the switching unit to control the switching on and off of the switching unit.

[0013] The control unit controls the third time to be earlier than the second time, and controls the third time to be earlier than the first time, or controls the third time to be later than the first time, or controls the third time and the first time to be the same time.

[0014] Optionally, the driving circuit further includes a driving unit;

[0015] The first terminal of the driving unit is connected to the switching unit; the second terminal of the driving unit is connected to the data voltage unit; and the third terminal of the driving unit is connected to the light source.

[0016] Specifically, between the first and second time points, the data voltage unit is electrically connected to the driving unit; after the third time point, the switching unit is electrically connected to the driving unit, and the light source is electrically connected to the driving unit.

[0017] Optionally, the driving unit includes driving MOS transistors and / or driving TFTs;

[0018] The display panel includes an AMOLED panel and / or a Micro OLED panel.

[0019] Optionally, the data voltage unit includes:

[0020] A data voltage transistor, wherein the first terminal of the data voltage transistor is connected to the display data voltage supply terminal; the second terminal of the data voltage transistor is connected to the driving unit of the driving circuit; and the control terminal of the data voltage transistor is used to receive data voltage control signals.

[0021] A storage device is provided for storing the display data voltage; a first terminal of the storage device is connected to the second terminal of the data voltage transistor to receive the display data voltage.

[0022] Specifically, at the first moment, the data voltage control signal controls the data voltage transistor to turn on; at the second moment, the data voltage control signal controls the data voltage transistor to turn off.

[0023] Optionally, the switching unit includes:

[0024] A switching transistor is included, with its first terminal connected to a voltage supply terminal and its second terminal connected to a drive unit of the drive circuit. The control terminal of the switching transistor is used to receive switching control signals.

[0025] At the third moment, the switch control signal controls the switching transistor to turn on, and the corresponding light source is electrically connected to the voltage supply terminal.

[0026] Optionally, the display panel includes multiple display areas arranged in an array;

[0027] The driving circuit includes multiple independent data voltage units, each of which corresponds to a display area; each data voltage unit is connected to a corresponding switching unit.

[0028] According to another aspect of the present invention, a display device is provided, comprising a driving circuit as described above, the driving circuit being used for driving the display.

[0029] According to another aspect of the present invention, a driving method is provided for driving a display panel, comprising:

[0030] At the first moment, the data voltage unit is turned on to write the display data voltage;

[0031] At the second moment, the data voltage unit is turned off; and

[0032] At the third moment, the switching unit is turned on to illuminate the light source corresponding to the displayed data voltage.

[0033] Wherein, the first moment is earlier than the second moment; the third moment is earlier than the second moment.

[0034] Optionally, the third time point is later than the first time point; or

[0035] The third time point is the same as the first time point.

[0036] According to the driving circuit and display device and driving method of the present invention, the switching unit is turned on before the data voltage unit is turned off, thereby avoiding the influence of the feedthrough effect in the driving circuit on the display data voltage and displaying the screen more accurately.

[0037] Furthermore, turning on the switching unit before turning off the data voltage unit can also reduce the voltage fluctuation amplitude at the node of the switching unit.

[0038] Furthermore, the switching unit is turned on during the conduction period of the data voltage unit, which balances the accuracy of the displayed data voltage with the duration of the switching unit's conduction.

[0039] Furthermore, the driving method is simple, and the driving circuit can be modified from the existing circuit structure, making it highly applicable and promising for application.

[0040] Furthermore, using independent driving circuits to drive different display areas of the display panel ensures the uniformity of the display panel display and improves the overall display consistency. Attached Figure Description

[0041] The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0042] Figure 1 A schematic diagram of the driving circuit according to an embodiment of the present invention is shown.

[0043] Figure 2 A flowchart of a driving method according to an embodiment of the present invention is shown.

[0044] Figure 3 A circuit diagram of a driving circuit according to an embodiment of the present invention is shown.

[0045] Figure 4 A schematic diagram illustrating the working principle of a drive circuit according to an embodiment of the present invention is shown.

[0046] Figure 5 A schematic diagram of the driving principle according to Embodiment 1 of the present invention is shown.

[0047] Figure 6 A schematic diagram of the driving principle according to Embodiment 2 of the present invention is shown.

[0048] Figure 7 A schematic diagram of the driving principle according to Embodiment 3 of the present invention is shown.

[0049] Figure 8 A schematic diagram of the driving circuit according to Embodiment 4 of the present invention is shown.

[0050] Figure 9 A comparison diagram of the driving effect according to Embodiment 4 of the present invention is shown. Detailed Implementation

[0051] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale. Furthermore, certain well-known parts may not be shown in the drawings.

[0052] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. Many specific details of the invention, such as the structure, materials, dimensions, processing techniques, and methods of the components, are described below to provide a clearer understanding of the invention. However, as those skilled in the art will understand, the invention may be implemented without following these specific details.

[0053] It should be understood that when describing the structure of a component, when referring to a layer or region as being "above" or "on top of" another layer or region, it can mean that it is directly above the other layer or region, or that it contains other layers or regions between it and the other layer or region. Furthermore, if the component is flipped over, that layer or region will be located "below" or "under" the other layer or region.

[0054] Figure 1 A schematic diagram of the driving circuit according to an embodiment of the present invention is shown. Figure 1 As shown, the driving circuit according to an embodiment of the present invention is applied to drive a display panel. The driving circuit includes a data voltage unit 110 and a switching unit 120 connected to the data voltage unit 110.

[0055] Specifically, the data voltage unit 110 is used to write display data voltage.

[0056] At a first moment, the data voltage unit 110 is turned on to write the display data voltage; at a second moment, the data voltage unit 110 is turned off; wherein, the first moment is earlier than the second moment.

[0057] At a third moment, earlier than the second moment, the switching unit 120 is turned on to illuminate the light source corresponding to the display data voltage. Optionally, the switching unit 120 includes an EM switch. The EM switch is used in the driving circuit of the display panel to realize the display driving of the display panel.

[0058] Display data voltage, for example, refers to the voltage signal used in display technology to control the brightness and color of pixels. In various display technologies such as liquid crystal displays (LCDs) and organic light-emitting diode (OLED) displays, display data voltage is used to control the brightness and color of each pixel.

[0059] For liquid crystal displays (LCDs), display data voltage is applied to the liquid crystal molecules. By changing the electric field, the orientation of the liquid crystal molecules is adjusted, thereby controlling the degree of light transmission and achieving changes in pixel brightness and color. For OLED displays, display data voltage is applied to each light-emitting diode (LED) pixel. The brightness and color of each pixel are controlled by adjusting the current or voltage.

[0060] The magnitude and waveform pattern of the displayed data voltage depend on the specific display technology and monitor design. Appropriate display data voltage range and waveform design are crucial to ensure the monitor can accurately display the required brightness and color effects.

[0061] In an optional embodiment of the present invention, the driving circuit further includes a control unit 130. The control unit 130 is connected to the data voltage unit 110 to control the on and off states of the data voltage unit 110. The control unit 130 is also connected to the switching unit 120 to control the on and off states of the switching unit 120. The control unit 130 controls the third time point to be earlier than the second time point, and controls the third time point to be earlier than the first time point, or controls the third time point to be later than the first time point, or controls the third time point and the first time point to be the same time point.

[0062] According to another aspect of the present invention, a corresponding driving method is provided, particularly an OLED pixel circuit operation method for improving feedthrough effect. Figure 2 A flowchart of a driving method according to an embodiment of the present invention is shown. Figure 2 As shown, the driving method according to an embodiment of the present invention is applied to the driving of a display panel, and is implemented, for example, by the driving circuit described above. The driving method includes the following steps:

[0063] In step S101, at the first moment, the data voltage unit is turned on to write the display data voltage;

[0064] At the first moment, the data voltage unit is turned on, and the display data voltage is written through the data voltage unit.

[0065] In step S102, at the second moment, the data voltage unit is turned off;

[0066] At the second moment, the data voltage unit is turned off, and the writing of the displayed data voltage is stopped. The first moment occurs earlier than the second moment.

[0067] In step S103, at the third moment, the switching unit is turned on to illuminate the light source corresponding to the display data voltage.

[0068] At the third moment, the switching unit is turned on, and the light source corresponding to the display data voltage is lit through the switching unit, thereby realizing the display control of the pixel corresponding to the display data voltage. The third moment is earlier than the second moment.

[0069] In an optional embodiment of the present invention, the third time point is earlier than the first time point, and the first time point is earlier than the second time point.

[0070] In an optional embodiment of the present invention, the first time point is earlier than the third time point, and the third time point is earlier than the second time point.

[0071] Figure 3 A circuit diagram of a driving circuit according to an embodiment of the present invention is shown. Figure 3 As shown, the driving circuit 100 according to an embodiment of the present invention includes a data voltage unit 110, a switching unit 120 (not shown in the figure), a control unit 130 (not shown in the figure), a driving unit 140, and a light source 150. The switching unit 120 includes a switching transistor 121; the data voltage unit 110 includes a data voltage transistor 111 and a storage device 112.

[0072] Specifically, the first terminal of the driving unit 140 is connected to the switching unit 120 (switching transistor 121). The second terminal of the driving unit 140 is connected to the data voltage unit 110. The third terminal of the driving unit 140 is connected to the light source 150. Optionally, the first terminal of the light source 150 is connected to the driving unit 140, and the second terminal of the light source 150 is connected to the voltage terminal (ELVSS). The light source 150 is, for example, an organic light-emitting diode (OLED). Between the first and second time points, the data voltage unit 110 is electrically connected to the driving unit 140 to write display data voltage; after the third time point, the switching unit 120 is electrically connected to the driving unit 140, and the driving unit 140 is electrically connected to the light source 150 to illuminate the light source 150.

[0073] The data voltage unit 110 includes a data voltage transistor 111 and a storage device 112. The first terminal of the data voltage transistor 111 is connected to the display data voltage supply terminal (VDATA). The second terminal of the data voltage transistor 111 is connected to the drive unit 140 of the drive circuit. The control terminal of the data voltage transistor 111 is used to receive data voltage control signals.

[0074] Storage device 112 is used to store the display data voltage. A first terminal of storage device 112 is connected to a second terminal of data voltage transistor 111 to receive the display data voltage. Specifically, at the first moment, a data voltage control signal controls data voltage transistor 111 to turn on (to write the display data voltage into storage device 112); at the second moment, the data voltage control signal controls data voltage transistor 111 to turn off.

[0075] The first terminal of the switching transistor 121 is connected to the voltage supply terminal (ELVDD). The second terminal of the switching transistor 121 is connected to the drive unit 140 of the drive circuit. The control terminal of the switching transistor 121 is used to receive the switching control signal. Specifically, at the third moment, the switching control signal controls the switching transistor 121 to conduct, and the corresponding light source 150 is electrically connected to the voltage supply terminal, which provides voltage to the light source 150 to illuminate it.

[0076] In an optional embodiment of the present invention, the driving unit 140 includes at least one selected from driving MOS transistors and driving TFTs. The display panel driven by the driving circuit according to an embodiment of the present invention includes at least one selected from AMOLED (Active-Matrix Organic Light-Emitting Diode) panels and Micro OLED panels. Taking AMOLED panels as an example, active-matrix organic light-emitting diode display panels are among the most commonly used display devices. An active-matrix organic light-emitting diode display panel includes multiple pixels, each pixel corresponding to a thin-film transistor (TFT). The gate of the thin-film transistor is connected to a scan line extending horizontally, the source is connected to a data line extending vertically, and the drain is connected to the corresponding pixel electrode. If a sufficient positive voltage is applied to a scan line in the horizontal direction, all thin-film transistors connected to that scan line will turn on, writing the data signal voltage loaded on the data line into the pixel electrode.

[0077] Figure 4 A schematic diagram illustrating the working principle of a drive circuit according to an embodiment of the present invention is shown. Figure 4 As shown, when the data voltage unit 110 is turned on, display data voltage can be written. When the switching transistor 121 (switching unit 120) is turned on, the light source 150 is lit.

[0078] Due to limitations in existing manufacturing processes, parasitic capacitance inevitably exists between the two ends of the drive unit 140. Figure 4 The diagram illustrates the parasitic capacitance that exists between nodes A and B. Due to this parasitic capacitance, existing drive circuits experience a feedthrough effect during operation, affecting the accuracy of the displayed data voltage and causing display deviations. Furthermore, the feedthrough effect caused by parasitic capacitance also affects the uniformity of the panel display.

[0079] Figure 5 A schematic diagram of the driving principle according to Embodiment 1 of the present invention is shown. Figure 5 The diagram schematically shows the first time point T1, the second time point T2, and the third time point T3, as well as the signals of each part.

[0080] Combination Figure 4 and Figure 5As shown, in the scheme described in Embodiment 1 of the present invention, data is written in stage 1 (first stage); in stage 2 (second stage), the switching unit (e.g., EM switch) is turned on to make the OLED (light source) emit light. Specifically, at the first time T1, the data voltage unit 110 is turned on to write the display data voltage; at the third time T3, the switching transistor 121 (switching unit 120) is turned on to light up the light source 150 corresponding to the display data voltage; at the second time T2, the data voltage unit 110 is turned off.

[0081] In the technical solution described in Embodiment 1 of the present invention, the turn-on time of the switching unit (third time T3) is advanced to the period during which the data voltage unit (including, for example, the GOA circuit) is turned on, that is, between the first time T1 and the second time T2 (in the middle of stage 1), thereby reducing the floating discharge time of node B and improving the voltage fluctuation amplitude. Between the third time T3 and the second time T2, since the data voltage unit is still turned on, node A can still be charged back to the correct display data voltage (Vdata) after being affected by the feedthrough effect.

[0082] Figure 6 A schematic diagram of the driving principle according to Embodiment 2 of the present invention is shown. Figure 6 Example 2 shown Figure 5 Compared to the first embodiment shown, the difference lies in the turn-off interval of the switching unit, while the rest are similar.

[0083] Figure 7 A schematic diagram of the driving principle according to Embodiment 3 of the present invention is shown. Figure 7 The diagram schematically shows the first time point T1, the second time point T2, and the third time point T3, as well as the signals of each part.

[0084] Combination Figure 4 and Figure 7 As shown, in the solution described in Embodiment 3 of the present invention, the driving circuit drives the circuit frame by frame. The display of each frame corresponds to an independent driving process as described in claim 1.

[0085] In the first stage of the existing frame (Now frame stage 1), data is written; in the second stage of the existing frame (Now frame stage 2), the switching unit is turned on to make the light source emit light. Specifically, at the first time T1, the data voltage unit 110 is turned on to write the display data voltage; at the third time T3 (the third time T3 is the same as the first time T1), the switching transistor 121 (switching unit 120) is turned on to light up the light source 150 corresponding to the display data voltage; at the second time T2, the data voltage unit 110 is turned off. In another optional embodiment of the present invention, the third time T3 may be earlier than the first time T1, for example, the switching unit is turned on in the second stage of the previous frame (Last frame stage 2).

[0086] In the above embodiments of the present invention, advancing the switching unit's activation time to the data voltage unit's activation period or further advances it allows the voltage of node A to effectively compensate for the voltage spike caused by the feedthrough effect in the first stage of the existing frame, so as to store more accurate display data voltage in the storage device (the storage device is, for example, a capacitor). In the second stage of the existing frame, the light emission can be controlled with more accurate data, achieving the goal of consistent overall light emission brightness.

[0087] In an optional embodiment of the present invention, the display panel driven by the driving circuit includes multiple display areas arranged in an array. The driving circuit includes multiple independent data voltage units, each data voltage unit corresponding to a display area; each data voltage unit is connected to a corresponding switching unit.

[0088] Figure 8 A schematic diagram of the driving circuit according to Embodiment 4 of the present invention is shown. Figure 8 As shown, the display panel is divided into a first display area 201, a second display area 202, a third display area 203, and a fourth display area 204. Of course, the division into four display areas is only for illustration; in reality, the number of display areas is much greater than four.

[0089] The first display area 201, the second display area 202, the third display area 203, and the fourth display area 204 are arranged in an array. Due to limitations of existing processes, the parasitic capacitance (feedthrough effect) in each display area is not uniform. Under the existing driving method, the uniformity of each display area is poor.

[0090] The first display area 201, the second display area 202, the third display area 203, and the fourth display area 204 each correspond to an independent driving circuit 100 (the specific structure of the driving circuit 100 can be found in [reference]). Figure 3 (as shown), and is driven by the corresponding drive circuit 100.

[0091] Figure 9 A comparison diagram of the driving effect according to Embodiment 4 of the present invention is shown. For example... Figure 9 As shown, for the same input signal (original expected data diagram), when using the existing driving method, due to the poor uniformity of parasitic capacitance in each area and the influence of feedthrough effect, the display of each area is not only inaccurate, but also has poor uniformity. When using the driving method described in this application, the influence of parasitic capacitance (feedthrough effect) on the display is overcome, the display of each area is accurate, the uniformity is good, and the overall display effect is good.

[0092] According to another aspect of the present invention, a display device is provided. The display device includes a driving circuit as described above. The driving circuit is used for driving the display.

[0093] 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 limitation, 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.

[0094] As described above, these embodiments of the present invention do not exhaustively cover all details, nor do they limit the invention to the specific embodiments described. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A driving circuit for driving a display panel, comprising: The data voltage unit is used to write display data voltage. as well as The switching unit connected to the data voltage unit, Specifically, at the first moment, the data voltage unit is turned on to write the display data voltage; At a second moment, the data voltage unit is turned off; the first moment is earlier than the second moment; at a third moment, earlier than the second moment, the switching unit is turned on to illuminate the light source corresponding to the display data voltage; the switching unit is turned on before the data voltage unit is turned off to avoid the influence of the feedthrough effect in the driving circuit on the display data voltage.

2. The driving circuit according to claim 1, wherein, The driving circuit also includes: A control unit, connected to the data voltage unit to control the switching on and off of the data voltage unit; the control unit is also connected to the switching unit to control the switching on and off of the switching unit. The control unit controls the third time to be earlier than the second time, and controls the third time to be earlier than the first time, or controls the third time to be later than the first time, or controls the third time and the first time to be the same time.

3. The driving circuit according to claim 1, wherein, The driving circuit also includes a driving unit; The first terminal of the driving unit is connected to the switching unit; the second terminal of the driving unit is connected to the data voltage unit; and the third terminal of the driving unit is connected to the light source. Specifically, between the first and second time points, the data voltage unit is electrically connected to the driving unit; after the third time point, the switching unit is electrically connected to the driving unit, and the light source is electrically connected to the driving unit.

4. The driving circuit according to claim 3, wherein, The driving unit includes a driving MOS transistor and / or a driving TFT; the display panel includes an AMOLED panel and / or a MicroOLED panel.

5. The driving circuit according to claim 1, wherein, The data voltage unit includes: A data voltage transistor, wherein the first terminal of the data voltage transistor is connected to the display data voltage supply terminal; the second terminal of the data voltage transistor is connected to the driving unit of the driving circuit; and the control terminal of the data voltage transistor is used to receive data voltage control signals. A storage device is provided for storing the display data voltage; a first terminal of the storage device is connected to the second terminal of the data voltage transistor to receive the display data voltage. Specifically, at the first moment, the data voltage control signal controls the data voltage transistor to turn on; at the second moment, the data voltage control signal controls the data voltage transistor to turn off.

6. The driving circuit according to claim 1, wherein, The switching unit includes: A switching transistor, wherein the first terminal of the switching transistor is connected to the voltage supply terminal; the second terminal of the switching transistor is connected to the driving unit of the driving circuit; the control terminal of the switching transistor is used to receive a switching control signal, wherein, at the third moment, the switching control signal controls the switching transistor to conduct, and the corresponding light source is electrically connected to the voltage supply terminal.

7. The driving circuit according to claim 1, wherein, The display panel includes multiple display areas arranged in an array; The driving circuit includes multiple independent data voltage units, each of which corresponds to a display area; each data voltage unit is connected to a corresponding switching unit.

8. A display device, comprising: The driving circuit according to any one of claims 1-7, wherein the driving circuit is used for driving the display.

9. A driving method applied to driving a display panel, comprising: At the first moment, the data voltage unit is turned on to write the display data voltage; At the second moment, the data voltage unit is turned off; as well as At the third moment, the switching unit is turned on to illuminate the light source corresponding to the displayed data voltage. Wherein, the first moment is earlier than the second moment; the third moment is earlier than the second moment; the switching unit is turned on before the data voltage unit is turned off, so as to avoid the influence of the feedthrough effect in the driving circuit on the display data voltage.

10. The driving method according to claim 9, wherein, The third time is later than the first time; or the third time is the same as the first time.

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