Pre-charging method, array circuit and low-temperature polycrystalline silicon display device

Abstract

The invention discloses a pre-charging method, an array circuit and a low-temperature polycrystalline silicon display device, and the method comprises the steps: carrying out the pre-charging of a first pixel in a pixel unit at a first line charging end stage of a charging period, and carrying out the pre-charging of a second pixel in the pixel unit at a second line charging end stage of the charging period, pre-charging a third pixel in the pixel unit at a charging end stage of a third row of a charging cycle; and carrying out the next charging period. Pixels in an array circuit of the low-temperature polycrystalline silicon display device are pre-charged periodically by adjusting a driving time sequence, so that the refresh rate of the low-temperature polycrystalline silicon display panel is improved under the condition that the display quality is ensured. And the problem of insufficient charging is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of precharging of low-temperature polysilicon display panels, and in particular to a precharging method, an array circuit and a low-temperature polysilicon display device. Background Art

[0002] Low Temperature Poly-silicon (LTPS) technology has been widely used due to its advantages such as high mobility. At present, it is gradually developing towards large size, high resolution (High Resolution) and high refresh frequency (High Frequency). The current low temperature polysilicon display panel is equipped with multiple rows of scan lines and multiple columns of parallel data lines that intersect the scan lines perpendicularly and are insulated from each other to form an array circuit; each scan line connects all pixels in the same row, and each data line connects all pixels in the same column; the area surrounded by every two adjacent scan lines and every two adjacent data lines contains a pixel, and the polarity of any pixel is opposite to the polarity of its adjacent pixel.

[0003] If the liquid crystal molecules always maintain the same orientation state, the physical properties of the liquid crystal molecules may be permanently damaged and the liquid crystal may deteriorate. In order to suppress liquid crystal degradation and maintain the display quality of the image, the direction of the electric field applied to each pixel needs to be reversed at a certain time interval. In other words, the positive and negative polarity of each pixel is reversed at a certain time interval. The pixel polarity is changed once per cycle, so that the pixel needs to be charged and discharged every time the pixel polarity is refreshed.

[0004] However, low-temperature polysilicon uses multiplex conversion technology (MUX), which makes it impossible to pre-charge and results in insufficient charging, making it impossible for the display to have a high refresh rate, reducing the quality of the display. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a pre-charging method, circuit and low-temperature polysilicon display device to solve the problem that the existing low-temperature polysilicon display device cannot be pre-charged, resulting in insufficient charging.

[0006] In a first aspect, a pre-charging method comprises: In a charging cycle, at the end of the first row charging stage, the first pixel in the pixel unit is precharged, at the end of the second row charging stage, the second pixel in the pixel unit is precharged, and at the end of the third row charging stage, the third pixel in the pixel unit is precharged; Carry out the next charging cycle; The first pixel, the second pixel, and the third pixel are respectively one of an R pixel, a G pixel, and a B pixel.

[0007] In combination with the precharging method described in the first aspect, in a first possible implementation manner, precharging the first pixel in the pixel unit at the end stage of the first row charging in a charging cycle, precharging the second pixel in the pixel unit at the end stage of the second row charging, and precharging the third pixel in the pixel unit at the end stage of the third row charging, includes: Pre-charging the R pixels in the pixel unit at the end stage of the first row charging in the charging cycle; Pre-charging the G pixels in the pixel unit at the end stage of the second row charging in the charging cycle; The B pixels in the pixel unit are pre-charged at the end stage of the third row charging of the charging cycle.

[0008] In combination with the precharging method described in the first aspect, in a second possible implementation manner, precharging the first pixel in the pixel unit at the end of the first row charging stage of a charging cycle, precharging the second pixel in the pixel unit at the end of the second row charging stage, and precharging the third pixel in the pixel unit at the end of the third row charging stage, includes: Pre-charging the G pixels in the pixel unit at the end stage of the first row charging in the charging cycle; Pre-charging the B pixels in the pixel unit at the end stage of the second row charging in the charging cycle; The R pixels in the pixel unit are pre-charged at the end stage of the third row charging of the charging cycle.

[0009] In combination with the precharging method described in the first aspect, in a third possible implementation manner, precharging the first pixel in the pixel unit at the end stage of the first row charging in a charging cycle, precharging the second pixel in the pixel unit at the end stage of the second row charging, and precharging the third pixel in the pixel unit at the end stage of the third row charging, includes: Pre-charging the B pixels in the pixel unit at the end stage of the first row charging in the charging cycle; Pre-charging the R pixels in the pixel unit at the end stage of the second row charging in the charging cycle; The G pixels in the pixel unit are pre-charged at the end stage of the third row charging of the charging cycle.

[0010] In a second aspect, an array circuit adopts the pre-charging method described in the first aspect to perform drive scanning, comprising: A plurality of pixel unit circuits; The pixel unit circuit includes an R pixel scanning line, a G pixel scanning line, a B pixel scanning line, an R pixel triode, a G pixel triode, and a B pixel triode; Data cable; The R pixel scan line, the G pixel scan line, and the B pixel scan line are electrically connected to the gates of the R pixel transistor, the G pixel transistor, and the B pixel transistor, respectively; the data line is electrically connected to the source electrodes of the R pixel transistor, the G pixel transistor, and the B pixel transistor; and the drain electrodes of the R pixel transistor, the G pixel transistor, and the B pixel transistor are commonly connected to a voltage end.

[0011] In a third aspect, a low temperature polysilicon display device comprises the array circuit and the timing control module described in the second aspect; The timing control module is electrically connected to the pre-charging circuit; The timing control module is used to control the pre-charging circuit: Precharging the first pixel in the pixel unit at the end of the first row of charging in a charging cycle, precharging the second pixel in the pixel unit at the end of the second row of charging in a charging cycle, and precharging the third pixel in the pixel unit at the end of the third row of charging in a charging cycle; The first pixel, the second pixel, and the third pixel are respectively one of an R pixel, a G pixel, and a B pixel.

[0012] In conjunction with the low-temperature polysilicon display device described in the third aspect, in a first possible implementation manner, the timing control module includes: A first timing driving unit; The first timing driving unit is used for: At the end of the first row of charging in the charging cycle, the R pixels in the pixel unit are precharged, at the end of the second row of charging in the charging cycle, the G pixels in the pixel unit are precharged, and at the end of the third row of charging in the charging cycle, the B pixels in the pixel unit are precharged.

[0013] In conjunction with the low-temperature polysilicon display device described in the third aspect, in a second possible implementation manner, the timing control module includes: A second timing driving unit; The second timing driving unit is used for: At the end of the first row of charging in the charging cycle, the G pixels in the pixel unit are precharged, at the end of the second row of charging in the charging cycle, the B pixels in the pixel unit are precharged, and at the end of the third row of charging in the charging cycle, the R pixels in the pixel unit are precharged.

[0014] In conjunction with the low-temperature polysilicon display device described in the third aspect, in a third possible implementation manner, the timing control module includes: A third timing driving unit; The third timing driving unit is used for: At the end of the first row of charging in the charging cycle, the B pixels in the pixel unit are precharged, at the end of the second row of charging in the charging cycle, the R pixels in the pixel unit are precharged, and at the end of the third row of charging in the charging cycle, the G pixels in the pixel unit are precharged.

[0015] Compared with the prior art, the embodiments of the present application have the following technical effects: by adjusting the driving timing, the pixels in the array circuit of the low-temperature polysilicon display device are periodically precharged, so that the refresh rate of the low-temperature polysilicon display panel is improved while ensuring the display quality, thereby avoiding the occurrence of insufficient charging problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a driving timing diagram of a low-temperature polysilicon display device in the prior art; Figure 2 It is a pixel driving sequence diagram of a low-temperature polysilicon display device in the prior art; Figure 3 This is a driving timing diagram of the low-temperature polysilicon display device in the present application; Figure 4 is a pixel driving sequence diagram of a low-temperature polysilicon display device in the present application; Figure 5 is a schematic diagram of an array circuit of a low-temperature polysilicon display device in the present application; Figure 6 is a flowchart of a specific implementation of the pre-charging method in the present application; Figure 7 yes Figure 6 Flow chart of a first specific implementation mode of S100; Figure 8 yes Figure 6 Flow chart of a second specific implementation manner of S100; Fig. 9 yes Figure 6 Flow chart of a third specific implementation manner of S100. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings in the invention to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0019] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] The purpose of the embodiments of the present application is to provide a pre-charging method, circuit and low-temperature polysilicon display device to solve the problem that the existing low-temperature polysilicon display device cannot be pre-charged, resulting in insufficient charging.

[0023] The driving timing of the existing polysilicon display device, such as Figure 1 and Figure 2 , Figure 1 is a driving timing diagram of a low-temperature polysilicon display device in the prior art. Figure 2 This is a pixel driving sequence diagram of a low-temperature polysilicon display device in the prior art; pre-charging is impossible, and only R pixels, G pixels, and B pixels can be charged in the first row row1, so as to charge the pixels in subsequent rows. Since pre-charging is impossible, insufficient charging may occur, making it impossible for the display screen to have a high refresh rate, thereby reducing the quality of the display screen.

[0024] In view of the above problems, a precharging method, an array circuit and a polysilicon display device are proposed. In a first aspect, a pre-charging method, such as Figure 6 , Figure 6 It is a flowchart of a specific implementation of the pre-charging method in this application; including: S100, pre-charge the first pixel in the pixel unit at the end of the first row charging stage of a charging cycle, pre-charge the second pixel in the pixel unit at the end of the second row charging stage of a charging cycle, and pre-charge the third pixel in the pixel unit at the end of the third row charging stage of a charging cycle; S200, perform the next charging cycle; wherein the first pixel, the second pixel, and the third pixel are one of the R pixel, the G pixel, and the B pixel respectively.

[0025] In this embodiment, the first pixel, the second pixel, and the third pixel are respectively one of the R pixel, the G pixel, and the B pixel. Three rows of pixels are driven and scanned in one charging cycle, and each row drives and scans the R pixel, the G pixel, and the B pixel respectively.

[0026] In this embodiment, if Figure 3 and Figure 4 , Figure 3 is a driving timing diagram of the low-temperature polysilicon display device in this application, Figure 4 This is a pixel driving sequence diagram of the low-temperature polysilicon display device in the present application; by adjusting the driving timing, the R pixel, the G pixel, and the B pixel are precharged in sequence within one cycle, and the pixels in the array circuit of the low-temperature polysilicon display device are precharged periodically, so that the low-temperature polysilicon display panel can improve the refresh rate while ensuring the display quality. The problem of insufficient charging is avoided.

[0027] In a preferred embodiment, Figure 7 , Figure 7 yes Figure 6 Flowchart of the first specific implementation method of S100 in the figure; S100 includes: S110, pre-charging the R pixels in the pixel unit at the end of the first row charging stage of the charging cycle; S120, pre-charging the G pixels in the pixel unit at the end of the second row charging stage of the charging cycle; S130, pre-charging the B pixels in the pixel unit at the end of the third row charging stage of the charging cycle.

[0028] In this embodiment, in the driving scan timing of each row, at the end of charging, any one of the pixels can be selected for pre-charging.

[0029] In the embodiment of the present application, the charging end stage refers to the last pulse driving time of a certain pixel.

[0030] In this embodiment, the R pixels are pre-charged at the end of the charging stage of the first row, the other pixels in the first row are charged and driven according to the set driving sequence, and the R pixels are charged and driven at the first pulse driving time of the second row.

[0031] Similarly, the G pixels are pre-charged at the end of the charging stage of the second row, the other pixels in the second row are charged and driven according to the set driving sequence, and the G pixels are charged and driven at the first pulse driving time of the third row.

[0032] The B pixels are precharged at the end of the charging stage of the third row, and the other pixels in the third row are charged and driven according to the set driving sequence. The B pixels are charged and driven at the first pulse driving time of the first row of the next cycle.

[0033] In a preferred embodiment, Figure 8 , Figure 8 yes Figure 6 Flowchart of the second specific implementation method of S100 in the figure; S100 includes: S140, pre-charging the G pixels in the pixel unit at the end of the first row charging stage of the charging cycle; S150, pre-charging the B pixels in the pixel unit at the end of the second row charging stage of the charging cycle; S160, pre-charging the R pixels in the pixel unit at the end of the third row charging stage of the charging cycle.

[0034] In this embodiment, the G pixels are pre-charged at the end of the charging phase of the first row, the other pixels in the first row are charged and driven according to the set driving sequence, and the G pixels are charged and driven at the first pulse driving time of the second row.

[0035] Similarly, the B pixels are pre-charged at the end of the charging stage of the second row, the other pixels in the second row are charged and driven according to the set driving sequence, and the B pixels are charged and driven at the first pulse driving time of the third row.

[0036] The R pixels are pre-charged at the end of the charging stage of the third row, and the other pixels in the third row are charged and driven according to the set driving timing. The R pixels are charged and driven at the first pulse driving time of the first row of the next cycle.

[0037] In a preferred embodiment, Fig. 9 , Fig. 9 yes Figure 6Flowchart of the third specific implementation method of S100 in the figure; S100 includes: S170, pre-charging the B pixels in the pixel unit at the end of the first row charging stage of the charging cycle; S180, pre-charging the R pixels in the pixel unit at the end of the second row charging stage of the charging cycle; S190, pre-charging the G pixels in the pixel unit at the end of the third row charging stage of the charging cycle.

[0038] In this embodiment, if Figure 3 , the B pixels are pre-charged at the end of the charging stage of the first row, the other pixels in the first row are charged and driven according to the set driving timing, and the B pixels are charged and driven at the first pulse driving time of the second row.

[0039] Similarly, the R pixels are pre-charged at the end of the charging stage of the second row, the other pixels in the second row are charged and driven according to the set driving sequence, and the R pixels are charged and driven at the first pulse driving time of the third row.

[0040] The G pixels are precharged at the end of the charging stage of the third row, and the other pixels in the third row are charged and driven according to the set driving sequence. The G pixels are charged and driven at the first pulse driving time of the first row of the next cycle.

[0041] In a second aspect, an array circuit, such as Figure 5 , Figure 5 The present invention is a schematic diagram of an array circuit of a low-temperature polysilicon display device in the present application; the pre-charging method of the first aspect is used for drive scanning, including: a plurality of pixel unit circuits; the pixel unit circuit includes an R pixel scanning line MUXR, a G pixel scanning line MUXG, a B pixel scanning line MUXB, an R pixel triode, a G pixel triode, a B pixel triode, and a data line (S1 / S2); the R pixel scanning line MUXR, the G pixel scanning line MUXG, and the B pixel scanning line MUXB are electrically connected to the gates of the R pixel triode, the G pixel triode, and the B pixel triode, respectively; the data line (S1 / S2) is electrically connected to the source of the R pixel triode, the G pixel triode, and the B pixel triode; and the drains of the R pixel triode, the G pixel triode, and the B pixel triode are commonly connected to the voltage end.

[0042] In a third aspect, a low-temperature polysilicon display device comprises the array circuit of the second aspect and a timing control module; the timing control module is electrically connected to the pre-charging circuit; the timing control module is used to control the pre-charging circuit: at the end of the first row charging stage of a charging cycle, the first pixel in the pixel unit is pre-charged, at the end of the second row charging stage of a charging cycle, the second pixel in the pixel unit is pre-charged, and at the end of the third row charging stage of a charging cycle, the third pixel in the pixel unit is pre-charged; wherein the first pixel, the second pixel, and the third pixel are one of the R pixel, the G pixel, and the B pixel respectively.

[0043] Preferably, the timing control module includes a first timing driving unit; the first timing driving unit is used to pre-charge the R pixels in the pixel unit at the end of the first row charging stage of the charging cycle, pre-charge the G pixels in the pixel unit at the end of the second row charging stage of the charging cycle, and pre-charge the B pixels in the pixel unit at the end of the third row charging stage of the charging cycle.

[0044] Preferably, the timing control module includes a second timing driving unit; the second timing driving unit is used to pre-charge the G pixels in the pixel unit at the end of the first row charging stage of the charging cycle, pre-charge the B pixels in the pixel unit at the end of the second row charging stage of the charging cycle, and pre-charge the R pixels in the pixel unit at the end of the third row charging stage of the charging cycle.

[0045] Preferably, the timing control module includes a third timing driving unit; the third timing driving unit is used to pre-charge the B pixels in the pixel unit at the end of the first row charging stage of the charging cycle, pre-charge the R pixels in the pixel unit at the end of the second row charging stage of the charging cycle, and pre-charge the G pixels in the pixel unit at the end of the third row charging stage of the charging cycle.

[0046] Compared with the prior art, the embodiments of the present application have the following technical effects: by adjusting the driving timing, the pixels in the array circuit of the low-temperature polysilicon display device are periodically precharged, so that the refresh rate of the low-temperature polysilicon display panel is improved while ensuring the display quality, thereby avoiding the occurrence of insufficient charging problems.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pre-charging method, characterized in that it includes: In a charging cycle, at the end of the first row charging stage, the first pixel in the pixel unit is precharged, at the end of the second row charging stage, the second pixel in the pixel unit is precharged, and at the end of the third row charging stage, the third pixel in the pixel unit is precharged; Carry out the next charging cycle; The first pixel, the second pixel, and the third pixel are respectively one of an R pixel, a G pixel, and a B pixel.

2. The pre-charging method according to claim 1, wherein: The method of precharging the first pixel in the pixel unit at the end of the first row of charging in a charging cycle, precharging the second pixel in the pixel unit at the end of the second row of charging, and precharging the third pixel in the pixel unit at the end of the third row of charging includes: Pre-charging the R pixels in the pixel unit at the end stage of the first row charging in the charging cycle; Pre-charging the G pixels in the pixel unit at the end stage of the second row charging in the charging cycle; The B pixels in the pixel unit are pre-charged at the end stage of the third row charging of the charging cycle.

3. The pre-charging method according to claim 1, wherein: The method of precharging the first pixel in the pixel unit at the end of the first row of charging in a charging cycle, precharging the second pixel in the pixel unit at the end of the second row of charging, and precharging the third pixel in the pixel unit at the end of the third row of charging includes: Pre-charging the G pixels in the pixel unit at the end stage of the first row charging in the charging cycle; Pre-charging the B pixels in the pixel unit at the end stage of the second row charging in the charging cycle; The R pixels in the pixel unit are pre-charged at the end stage of the third row charging of the charging cycle.

4. The pre-charging method according to claim 1, wherein: The method of precharging the first pixel in the pixel unit at the end of the first row of charging in a charging cycle, precharging the second pixel in the pixel unit at the end of the second row of charging, and precharging the third pixel in the pixel unit at the end of the third row of charging includes: Pre-charging the B pixels in the pixel unit at the end stage of the first row charging in the charging cycle; Pre-charging the R pixels in the pixel unit at the end stage of the second row charging in the charging cycle; The G pixels in the pixel unit are pre-charged at the end stage of the third row charging of the charging cycle.

5. An array circuit, using the pre-charging method according to any one of claims 1 to 4 for drive scanning, characterized in that: include: A plurality of pixel unit circuits; The pixel unit circuit includes an R pixel scanning line, a G pixel scanning line, a B pixel scanning line, an R pixel triode, a G pixel triode, and a B pixel triode; Data cable; The R pixel scan line, the G pixel scan line, and the B pixel scan line are electrically connected to the gates of the R pixel transistor, the G pixel transistor, and the B pixel transistor, respectively; the data line is electrically connected to the source electrodes of the R pixel transistor, the G pixel transistor, and the B pixel transistor; and the drain electrodes of the R pixel transistor, the G pixel transistor, and the B pixel transistor are commonly connected to a voltage end.

6. A low-temperature polysilicon display device, characterized in that: It includes the array circuit and timing control module as claimed in claim 5; The timing control module is electrically connected to the pre-charging circuit; The timing control module is used to control the pre-charging circuit: Precharging the first pixel in the pixel unit at the end of the first row of charging in a charging cycle, precharging the second pixel in the pixel unit at the end of the second row of charging in a charging cycle, and precharging the third pixel in the pixel unit at the end of the third row of charging in a charging cycle; The first pixel, the second pixel, and the third pixel are respectively one of an R pixel, a G pixel, and a B pixel.

7. The low-temperature polysilicon display device according to claim 6, characterized in that: The timing control module comprises: A first timing driving unit; The first timing driving unit is used for: At the end of the first row of charging in the charging cycle, the R pixels in the pixel unit are precharged, at the end of the second row of charging in the charging cycle, the G pixels in the pixel unit are precharged, and at the end of the third row of charging in the charging cycle, the B pixels in the pixel unit are precharged.

8. The low-temperature polysilicon display device according to claim 6, characterized in that: The timing control module comprises: A second timing driving unit; The second timing driving unit is used for: At the end of the first row of charging in the charging cycle, the G pixels in the pixel unit are precharged, at the end of the second row of charging in the charging cycle, the B pixels in the pixel unit are precharged, and at the end of the third row of charging in the charging cycle, the R pixels in the pixel unit are precharged.

9. The low-temperature polysilicon display device according to claim 6, characterized in that: The timing control module comprises: A third timing driving unit; The third timing driving unit is used for: At the end of the first row of charging in the charging cycle, the B pixels in the pixel unit are precharged, at the end of the second row of charging in the charging cycle, the R pixels in the pixel unit are precharged, and at the end of the third row of charging in the charging cycle, the G pixels in the pixel unit are precharged.

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