Mono display panel and pixel charging method

Abstract

The application discloses a mono display screen and a pixel charging method. The display screen comprises: a pixel charging circuit; each pixel charging circuit comprises a first sub-pixel charging circuit, a common connection circuit and a second sub-pixel charging circuit; the first sub-pixel charging circuit is connected in series with the second sub-pixel charging circuit through the common connection circuit; and the common connection circuit is used for pre-charging a second sub-pixel capacitor in the second sub-pixel charging circuit when charging a first sub-pixel in the first sub-pixel capacitor charging circuit. By using three transistors to charge two sub-pixel capacitors, the length of the transistor channel is doubled, the second sub-pixel capacitor can be pre-charged when the first sub-pixel capacitor is charged, the charging time of the pixel capacitor is prolonged, the voltage fluctuation is maintained within a gray scale, and the stability and display quality of the display are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display screen, in particular to a mono display screen and a pixel charging method. BACKGROUND

[0002] With the development of modern industry, the display screen, the key of man-machine conversation, also develops rapidly, and various display technologies are also emerging. Handheld instruments, remote control, outdoor industrial robots, and some medical instruments require higher power and lower power consumption display screens.

[0003] The current general liquid crystal display device is composed of a source driver, a gate driver, an LCD panel, and a VCOM voltage generating circuit. Since each pixel is composed of R, G, and B, each pixel should contain three pixel units, and each pixel unit contains a TFT (thin film transistor) and a pixel capacitor. The pixel capacitor contains a display electrode and a common electrode, the display electrode is connected to the source electrode of the TFT, and all the common electrodes are connected together and connected to the VCOM voltage. The drain electrode of the TFT is connected to the signal output by the source driver, and the gate electrode is connected to the signal output by the gate driver.

[0004] The pixel capacitor stores voltage, which causes the liquid crystal molecules in the liquid crystal panel to deflect, and light transmits through the liquid crystal molecules to display gray scale. For general industrial screen driving frequency at 8HZ, the pixel voltage holding time is required to be long, but the existing liquid crystal display screen driving circuit cannot meet the performance requirements, and the stability is poor. SUMMARY

[0005] The existing industrial display screen has poor stability and cannot meet the requirements of display quality.

[0006] In view of the above problems, a mono display screen and a pixel charging method are proposed, which saves a lot of space by designing two same sub-pixels in one pixel and sharing the middle transistor. By using three transistors to charge two sub-pixel capacitors, the length of the transistor channel is doubled, and when charging the first sub-pixel capacitor, the second sub-pixel capacitor can be pre-charged, which prolongs the charging time of the pixel capacitor, so as to maintain the voltage fluctuation within a gray scale, and improves the display stability and display quality.

[0007] A mono display screen, comprising:

[0008] a pixel charging circuit;

[0009] Each of the pixel charging circuits comprises:

[0010] a first sub-pixel charging circuit;

[0011] a common connection circuit;

[0012] The second sub-pixel charging circuit;

[0013] The first sub-pixel charging circuit is connected in series with the second sub-pixel charging circuit through the common connection circuit;

[0014] The common connection circuit is configured to pre-charge the second sub-pixel capacitor when charging the first sub-pixel in the first sub-pixel charging circuit.

[0015] In a first possible implementation of the mono display screen, the first sub-pixel charging circuit comprises:

[0016] A first transistor;

[0017] A first storage capacitor;

[0018] A first sub-pixel capacitor;

[0019] The first storage capacitor and the first sub-pixel capacitor are connected in parallel, one end of which is grounded, and the other end is electrically connected to the drain end of the first transistor.

[0020] In a second possible implementation of the first possible implementation of the application, the second sub-pixel charging circuit comprises:

[0021] A second transistor;

[0022] A second storage capacitor;

[0023] A second sub-pixel capacitor;

[0024] The second storage capacitor and the second sub-pixel capacitor are connected in parallel, one end of which is grounded, and the other end is electrically connected to the source end of the second transistor.

[0025] In a third possible implementation of the second possible implementation of the application, the pixel charging circuit further comprises:

[0026] A power supply line;

[0027] The common connection circuit comprises a third transistor;

[0028] The source end of the first transistor, the drain end of the third transistor, and the drain end of the second transistor are electrically connected;

[0029] The source end of the third transistor is electrically connected to the power supply line.

[0030] In a second aspect, a pixel charging method for a mono display screen, using the driving circuit of the first aspect, comprises:

[0031] Step 100, connecting the first sub-pixel charging circuit and the second sub-pixel charging circuit in series through a common connection circuit;

[0032] Step 200, pre-charging the second sub-pixel capacitor while charging the first sub-pixel capacitor.

[0033] In the first possible implementation of the mono display screen pixel charging method, the step 100 comprises:

[0034] Step 110, electrically connecting the first sub-pixel charging circuit, the second sub-pixel charging circuit and the drain end of the third transistor in the common connection circuit;

[0035] Step 120, electrically connecting the source end of the third transistor and the common power line.

[0036] In the first possible implementation of the second aspect of the application, in the second possible implementation, the step 110 comprises:

[0037] Step 111, connecting the first storage capacitor of the first sub-pixel charging circuit and the first sub-pixel capacitor in parallel;

[0038] Step 112, grounding one end of the parallel circuit and electrically connecting the other end with the drain end of the first transistor.

[0039] In the second possible implementation of the second aspect of the application, in the third possible implementation, the step 110 further comprises:

[0040] Step 113, electrically connecting the source end of the first transistor and the drain end of the third transistor.

[0041] In the first possible implementation of the second aspect of the application, in the fourth possible implementation, the step 110 further comprises:

[0042] Step 114, connecting the second storage capacitor of the second sub-pixel charging circuit and the second sub-pixel capacitor in parallel;

[0043] Step 115, grounding one end of the parallel circuit and electrically connecting the other end with the drain end of the second transistor.

[0044] In the second possible implementation of the second aspect of the application, in the third possible implementation, the step 110 further comprises:

[0045] Step 116, electrically connecting the drain end of the second transistor and the drain end of the third transistor.

[0046] The mono display screen and the pixel charging method thereof can save a large amount of space by designing two same sub-pixels in one pixel and sharing the middle transistor. The charging of two sub-pixel capacitors by three transistors is equivalent to doubling the length of the transistor channel, and the second sub-pixel capacitor can be pre-charged when the first sub-pixel capacitor is charged, which prolongs the charging time of the pixel capacitor, maintains the voltage fluctuation within one gray scale, and improves the stability and display quality of the display. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0048] Figure 1 The pixel charging circuit module connection diagram in the present application;

[0049] Figure 2 The pixel charging circuit connection diagram in the present application;

[0050] Figure 3 The first schematic diagram of the pixel charging method of the mono display screen in the present application;

[0051] Figure 4 The second schematic diagram of the pixel charging method of the mono display screen in the present application;

[0052] Figure 5 The third schematic diagram of the pixel charging method of the mono display screen in the present application;

[0053] Figure 6 The fourth schematic diagram of the pixel charging method of the mono display screen in the present application. DETAILED DESCRIPTION

[0054] The technical solutions in the present application will be described in detail below with reference to the drawings in the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0056] It is to be noted that when an element is referred to as being "connected to" or "set on" another element, it can be directly connected to the other element or indirectly connected to the other element via a further element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element via a further element.

[0057] It is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, refer to the orientation or position of the device or element shown in the drawings, and are used only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0058] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implying a specified number of technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0059] The existing industrial display screen has poor stability and cannot meet the requirements of display quality.

[0060] In view of the above problems, a mono display screen and a pixel charging method thereof are provided.

[0061] Embodiment 1

[0062] A mono display screen, such as Figure 1 , Figure 1 A pixel charging circuit module connection diagram in the present application; including a pixel charging circuit; each pixel charging circuit includes a first sub-pixel charging circuit, a common connection circuit, and a second sub-pixel charging circuit; the first sub-pixel charging circuit is connected in series with the second sub-pixel charging circuit through the common connection circuit; the common connection circuit is used to pre-charge the second sub-pixel capacitor in the second sub-pixel charging circuit when charging the first sub-pixel in the first sub-pixel charging circuit.

[0063] The first sub-pixel charging circuit charges the first sub-pixel capacitor, the second sub-pixel charging circuit charges the second sub-pixel capacitor, the common connection circuit connects the two in series, the first sub-pixel and the second sub-pixel have different areas, and different gray scale voltages are formed.

[0064] The second sub-pixel capacitor is pre-charged through the common connection circuit, and the pixel charging time is prolonged.

[0065] Specifically, as Figure 2 , Figure 2 The pixel charging circuit connection diagram in the application is shown in the figure; the first sub-pixel charging circuit includes a first transistor TR1, a first storage capacitor C1 and a first sub-pixel capacitor C2; the first storage capacitor C1 and the first sub-pixel capacitor C2 are connected in parallel, one end of the parallel connection is grounded, and the other end is electrically connected with the drain end of the first transistor TR1.

[0066] Specifically, the second sub-pixel charging circuit includes a second transistor TR2, a second storage capacitor C3 and a second sub-pixel capacitor C4; the second storage capacitor C3 and the second sub-pixel capacitor C4 are connected in parallel, one end of the parallel connection is grounded, and the other end is electrically connected with the source end of the second transistor TR2.

[0067] Further, the pixel charging circuit further includes a power supply line; the common connection circuit includes a third transistor TR3;

[0068] The source end of the first transistor TR1, the drain end of the third transistor TR3 and the drain end of the second transistor TR2 are electrically connected; the source end of the third transistor TR3 is electrically connected with the power supply line. By designing two same sub-pixels in one pixel and sharing the middle transistor, a large amount of space is saved. By charging two sub-pixel capacitors through three transistors, the length of the transistor channel is doubled, the second sub-pixel capacitor can be pre-charged when the first sub-pixel capacitor is charged, the charging time of the pixel capacitor is prolonged, the voltage fluctuation is maintained within one gray scale, and the display stability and display quality are improved.

[0069] The first transistor TR1 / the third transistor TR3 / the second transistor TR2 are opened and closed in sequence, the first transistor TR1 and the third transistor TR3 are opened in sequence first, the first sub-pixel capacitor C2 is charged, after the charging time Ton ends, the first transistor TR1 is closed, the charging is completed, the third transistor TR3 is still open, and then the second transistor TR2 is opened, the second sub-pixel capacitor C4 is charged, after the charging time Ton ends, the third transistor TR3 and the second transistor TR2 are closed, so that the charging of one pixel is completed, the areas of the two sub-pixels are different, and two different gray scale voltages are formed.

[0070] When the first transistor TR1 and the third transistor TR3 are turned on, the input voltage thereof is between 4.5-5v, at this time, the second transistor TR2 has been turned on, but at this time, the input voltage of the second transistor TR2 is about 1v, at this time, the second sub-pixel capacitor C4 has begun to charge.

[0071] By using three transistors (TR1, TR2, TR3), two same sub-pixels can be designed in one pixel, the middle transistor is shared in the pixel, and the gate signals are shared two by two between pixels, thereby saving a large amount of space.

[0072] The main function of the double-transistor design is to reduce the off time I off of the transistor, which is equivalent to doubling the length of the transistor channel, thereby reducing the leakage current by an order of magnitude, and through the timing control of the IC drive, the switching time of the double Tr is sequentially switched, and the I on is not less, and a pre-charge function is also added, that is, the first transistor TR1 completes charging at the same time as the second transistor TR2 is pre-charged for ns, which is equivalent to lengthening the charging time of each gate line in a time period.

[0073] Embodiment 2

[0074] In a second aspect, as Figure 3 , Figure 3 is a first schematic diagram of the pixel charging method of the mono display screen in the application; the pixel charging method of the mono display screen uses the driving circuit of the first aspect, wherein the pixel charging method comprises the following steps:

[0075] Step 100, the first sub-pixel charging circuit and the second sub-pixel charging circuit are connected in series through the common connection circuit.

[0076] Preferably, as Figure 4 , Figure 4 is a second schematic diagram of the pixel charging method of the mono display screen in the application; step 100 comprises:

[0077] Step 110, the first sub-pixel charging circuit, the second sub-pixel charging circuit and the drain end of the third transistor TR3 in the common connection circuit are electrically connected; and step 120, the source end of the third transistor TR3 is electrically connected with the common power supply line.

[0078] Preferably, as Figure 5 , Figure 5 is a third schematic diagram of the pixel charging method of the mono display screen in the application; step 110 comprises:

[0079] Step 111, connecting the first storage capacitor C1 of the first sub-pixel charging circuit and the first sub-pixel capacitor C2 in parallel; Step 112, connecting one end of the parallel circuit to ground and the other end to the drain end of the first transistor TR1. Preferably, step 110 further comprises step 113, connecting the source end of the first transistor TR1 to the drain end of the third transistor TR3.

[0080] Preferably, as Figure 6 , Figure 6 The fourth schematic diagram of the mono display screen pixel charging method in the application. Step 110 further comprises: step 114, connecting the second storage capacitor C3 of the second sub-pixel charging circuit and the second sub-pixel capacitor C4 in parallel; and step 115, connecting one end of the parallel circuit to ground and the other end to the drain end of the second transistor TR2.

[0081] Preferably, step 110 further comprises step 116, connecting the drain end of the second transistor TR2 to the drain end of the third transistor TR3.

[0082] Step 200, pre-charging the second sub-pixel capacitor when charging the first sub-pixel capacitor.

[0083] The mono display screen and the pixel charging method thereof according to the application, by designing two same sub-pixels in one pixel and sharing the middle transistor, a large amount of space is saved. By charging two sub-pixel capacitors with three transistors, the length of the transistor channel is doubled, and when charging the first sub-pixel capacitor, the second sub-pixel capacitor can be pre-charged, the charging time of the pixel capacitor is prolonged, so that the voltage fluctuation is maintained within one gray scale, and the display stability and display quality are improved.

[0084] The above is only the preferred embodiment of the application, and is not used to limit the application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application, should be included in the protection scope of the application.

Claims

1. A mono display screen, characterized in that, include: Pixel charging circuit; Each of the pixel charging circuits includes: First sub-pixel charging circuit; Common connection circuit; Second sub-pixel charging circuit; The first sub-pixel charging circuit is connected in series with the second sub-pixel charging circuit through the common connection circuit; The common connection circuit is used to precharge the second sub-pixel capacitor in the second sub-pixel charging circuit when the first sub-pixel capacitor in the first sub-pixel capacitor charging circuit is being charged. When the first transistor TR1 of the first sub-pixel charging circuit and the third transistor TR3 of the common connection circuit are turned on, the input voltage is between 4.5 and 5V. At this time, the second transistor TR2 of the second sub-pixel charging circuit has been turned on, and the input voltage of the second transistor TR2 is 1V. At this time, the second sub-pixel capacitor C4 has started to charge. The first sub-pixel charging circuit includes a first transistor TR1, a first storage capacitor C1, and a first sub-pixel capacitor C2; the first storage capacitor C1 and the first sub-pixel capacitor C2 are connected in parallel, with one end of the parallel connection grounded and the other end electrically connected to the drain terminal of the first transistor TR1; the second sub-pixel charging circuit includes a second transistor TR2, a second storage capacitor C3, and a second sub-pixel capacitor C4; the second storage capacitor C3 and the second sub-pixel capacitor C4 are connected in parallel, with one end of the parallel connection grounded and the other end electrically connected to the source terminal of the second transistor TR2; the common connection circuit includes a third transistor TR3; The source terminal of the first transistor TR1, the drain terminal of the third transistor TR3, and the drain terminal of the second transistor TR2 are electrically connected; the source terminal of the third transistor TR3 is electrically connected to the power supply line.

2. The mono display screen according to claim 1, characterized in that, The first sub-pixel charging circuit includes: First transistor; First storage capacitor; First sub-pixel capacitance; The first storage capacitor and the first sub-pixel capacitor are connected in parallel, with one end of the parallel connection grounded and the other end electrically connected to the drain terminal of the first transistor.

3. The mono display screen according to claim 2, characterized in that, The second sub-pixel charging circuit includes: Second transistor; Second storage capacitor; Second sub-pixel capacitor; The second storage capacitor and the second sub-pixel capacitor are connected in parallel, with one end of the parallel connection grounded and the other end electrically connected to the source terminal of the second transistor.

4. The mono display screen according to claim 3, characterized in that, The pixel charging circuit also includes: Power cord; The common connection circuit includes a third transistor; The source terminal of the first transistor, the drain terminal of the third transistor, and the drain terminal of the second transistor are electrically connected. The source terminal of the third transistor is electrically connected to the power supply line.

5. A pixel charging method for a mono display screen, using the mono display screen according to any one of claims 1-4, characterized in that, include: Step 100: Connect the first sub-pixel charging circuit and the second sub-pixel charging circuit in series through a common connection circuit; Step 200: While charging the first sub-pixel capacitor, pre-charge the second sub-pixel capacitor.

6. The pixel charging method for a mono display screen according to claim 5, characterized in that, Step 100 includes: Step 110: Connect the drain terminal of the first sub-pixel charging circuit, the second sub-pixel charging circuit, and the third transistor in the common connection circuit. Step 120: Connect the source terminal of the third transistor to the common power line.

7. The pixel charging method for a mono display screen according to claim 6, characterized in that, Step 110 includes: Step 111: Connect the first storage capacitor and the first sub-pixel capacitor of the first sub-pixel charging circuit in parallel; Step 112: Ground one end of the parallel circuit and connect the other end to the drain terminal of the first transistor.

8. The pixel charging method for a mono display screen according to claim 7, characterized in that, Step 110 further includes: Step 113: Connect the source terminal of the first transistor to the drain terminal of the third transistor.

9. The pixel charging method for a mono display screen according to claim 6, characterized in that, Step 110 further includes: Step 114: Connect the second storage capacitor and the second sub-pixel capacitor of the second sub-pixel charging circuit in parallel; Step 115: Ground one end of the parallel circuit and connect the other end to the drain terminal of the second transistor.

10. The pixel charging method for a mono display screen according to claim 9, characterized in that, Step 110 further includes: Step 116: Electrically connect the drain terminal of the second transistor to the drain terminal of the third transistor.

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