This application claims the benefit of priority to Taiwan Patent Application No. 105115751, filed May 20, 2016. The entire content of the above identified application is incorporated herein by reference.
Some references, which may include patents, patent applications and various publications, are cited and discussed in the description of this disclosure. The citation and/or discussion of such references is provided merely to clarify the description of the present disclosure and is not an admission that any such reference is “prior art” to the disclosure described herein. All references cited and discussed in this specification are incorporated herein by reference in their entireties and to the same extent as if each reference was individually incorporated by reference.
The present invention relates to a display technology, and in particular, to a display device.
When a display device displays an image, sometimes a screen defect occurs. For example, a fracture or tearing occurs on the screen. This situation occurs because the number of image frames output by a video card of a computer is asynchronous with a scan frequency of the display device.
To solve the problem above, a vertical synchronization (V-Sync) function is developed in the industry. However, when the screen defect is solved by means of V-Sync, a problem of display lag is further incurred. Hence, an adaptive vertical synchronization (G-Sync) function is further developed in the industry, so as to solve the screen defect without incurring the problem of display lag.
As can be seen, apparently, the existing manners described above are still inconvenient and defective. To solve the problem above, those in related fields have tried hard to find a solution, but have not yet succeeded in developing a suitable solution so far.
A certain technical aspect of the content relates to a display device, including a plurality of pixels, a plurality of gate lines, a timing controller and a gate driver. The plurality of gate lines is electrically coupled to the pixels. The timing controller is configured to provide an initial pulse signal. The gate driver is electrically coupled to the timing controller and the gate lines and configured to receive the initial pulse signal. The gate driver receives the initial pulse signal with a high level and outputs gate signals to the gate lines during a period which is longer than half of a frame period of the display device, in response to a scan frequency of the display device changing from a first frequency to a second frequency, where the first frequency is higher than the second frequency.
In certain embodiments, the gate driver includes a driving circuitry. The driving circuitry is configured to receive a clock signal, and the driving circuitry outputs the clock signal to one of the gate lines as one of the gate signals according to the initial pulse signal with the high level.
In still certain embodiments, the driving circuitry includes an input end, an output end, and a switch. The input end is configured to receive the initial pulse signal, and the output end is configured to output one of the gate signals. The switch includes a first end, a control end, and a second end. The first end of the switch is configured to receive the clock signal, the control end of the switch is coupled to the input end, and the second end of the switch is coupled to the output end. The switch is configured to be conductive according to the initial pulse signal with the high level, so that the clock signal is transmitted from the first end to the second end, and the output end outputs the clock signal as one of the gate signals.
In still certain embodiments, in response to the scan frequency of the display device changing from the first frequency to the second frequency, the timing controller provides the initial pulse signal with the high level during a period which is longer than half of the frame period of the display device, and correspondingly switches the clock signal from a third frequency to a fourth frequency, the third frequency being lower than the fourth frequency.
Another aspect of the content relates to a display device, including a plurality of pixels, a plurality of gate lines, a timing controller and a gate driver. The plurality of gate lines is electrically coupled to the pixels. The timing controller is configured to provide an initial pulse signal. The gate driver is electrically coupled to the timing controller and the gate lines, and is configured to receive the initial pulse signal. The initial pulse signal has a first width when a scan frequency of the display device is a first frequency, the initial pulse signal has a second width when the scan frequency of the display device is a second frequency, the first frequency is higher than the second frequency, the second width is greater than the first width, and the gate driver is further configured to output gate signals to the gate lines according to the initial pulse signal.
In certain embodiments, the second width is greater than twice the first width.
In still certain embodiments, the gate driver includes a driving circuitry. The driving circuitry is configured to receive a clock signal, and the driving circuitry outputs the clock signal to one of the gate lines as one of the gate signals according to the initial pulse signal with a high level.
In still certain embodiments, the driving circuitry includes an input end, an output end, and a switch. The input end is configured to receive the initial pulse signal, and the output end is configured to output one of the gate signals. The switch includes a first end, a control end, and a second end. The first end of the switch is configured to receive the clock signal, the control end of the switch is coupled to the input end, and the second end of the switch is coupled to the output end. The switch is configured to be conductive according to the initial pulse signal with the high level, so that the clock signal is transmitted from the first end to the second end, and the output end outputs the clock signal to the gate lines as one of the gate signals.
In further certain embodiments, in response to the scan frequency of the display device changing from the first frequency to the second frequency, the timing controller provides the initial pulse signal with the high level during a period which is longer than half of the frame period of the display device, and correspondingly switches the clock signal from a third frequency to a fourth frequency, the third frequency being lower than the fourth frequency.
Another aspect of the content of relates to a display device, including a plurality of pixels, a plurality of gate lines, a timing controller and a gate driver. The plurality of gate lines is electrically coupled to the pixels. The timing controller is configured to provide an initial pulse signal. The gate driver is electrically coupled to the timing controller and the gate lines, and is configured to provide the gate lines gate signal and receive the initial pulse signal. The gate driver is configured to change a frequency of the gate signals from a third frequency to a fourth frequency, the third frequency being lower than the fourth frequency, in response to a scan frequency of the display device changing from a first frequency to a second frequency, the first frequency being higher than the second frequency.
In certain embodiments, the gate driver includes a driving circuitry. The driving circuitry is configured to receive a clock signal, and the driving circuitry outputs the clock signal to one of the gate lines as one of the gate signals according to the initial pulse signal with a high level.
In certain embodiments, the driving circuitry includes an input end, an output end and a switch. The input end is configured to receive the initial pulse signal, and the output end is configured to output one of the gate signals. The switch includes a first end, a control end, and a second end. The first end of the switch is configured to receive the clock signal, the control end of the switch is coupled to the input end, and the second end of the switch is coupled to the output end. The switch becomes conductive according to the initial pulse signal with the high level, so that the clock signal is transmitted from the first end to the second end, and the output end outputs the clock signal to the gate lines as one of the gate signals.
With reference to the implementation manners below, a person of ordinary skill in the technical field can easily understand the basic spirit and other invention objectives, as well as the technical means and implementation manners adopted.
To make the foregoing and other objectives, features, advantages, and embodiments easier to understand, the accompanying drawings are described as follows:
According to a common operation manner, the features and elements in the drawings are not drawn proportionally, and the drawing manner is intended to present, in an optimal manner, specific features and elements. In addition, same or similar reference numerals are used to represent similar elements/parts among different figures.
To make the description of the present disclosure more comprehensive and complete, illustrative descriptions specific to implementation manners and specific embodiments are provided below. However, this is not the only implementation or application form of the specific embodiments. The implementation manners cover features of a plurality of specific embodiments, method steps for constructing and operating these specific embodiments, and a sequence of the steps. However, other specific embodiments may also be used to implement same or equivalent functions and step sequence.
Unless otherwise defined in the specification, meanings of the scientific and technological terms used herein are the same as meanings understood and commonly used by a person of ordinary skill in the technical field. In addition, the noun in singular form used in the specification contains the plural form of the noun as long as it does not conflict with the context; and the noun in plural form used in the specification also contains the singular form of the noun.
In addition, the term “coupling” used herein may refer to direct physical or electrical contact between two or more elements, or indirect physical or electrical contact between two or more elements, and may also refer to mutual operations or actions between two or more elements.
To solve a screen defect that occurs occasionally when a display device displays an image, a vertical synchronization (V-Sync) technology or an adaptive vertical synchronization (G-Sync) technology is used in the industry. When the foregoing technology is adopted, if a polymer stabilized alignment (PSA) mode liquid crystal array is used in combination with a color filter on array (COA) pixel architecture, due to an orientation polarization effect, a value of capacitance in pixels rises as the frequency declines, causing a capacitor undercharge, and as a result, the brightness of the display device decreases. Certain embodiments provide a display device and a driving method, for the related problem of a decrease in brightness caused by a capacitance change in pixels due to the orientation polarization effect. Detailed descriptions are provided below.
To understand the operation manner of the display device 100 shown in
Please refer to
In other words, when the scan frequency of the display device 100 changes from the first frequency (as shown in
In this way, referring to
In an embodiment, referring to
In another embodiment, the second width W2 is greater than triple of the first width W1. In still another embodiment, the second width W2 is greater than twice of the first width W1. In further another embodiment, the second width W2 is greater than 1.5 times of the first width W1. However, the present invention is not limited to the foregoing embodiments, and during implementation of the present invention, a proper ratio of the second width W2 to the first width W1 can be selectively adopted according to an actual requirement.
In an embodiment, the driving circuitry 121 includes an input end Q1, an output end which is the terminal providing gate signal N, a switch T1, and a switch T2. The switch T1 includes a first end, a control end, and a second end. In terms of a connection relationship, the control end of the switch T1 is coupled to the input end Q1, and the second end of the switch T1 is electrically coupled to the output end providing gate signal N. In terms of operations, the initial pulse signal VST output by the timing controller 130 is provided to the switch T2, the switch T2 receives the initial pulse signal VST and provides the high level signal to the input end Q1 of the driving circuitry 121, and the input end Q1 of the driving circuitry 121 correspondingly receives the initial pulse signal VST output by the timing controller 130. The output end of the driving circuitry 121 is configured to output the gate signal N. The first end of the switch T1 of the driving circuitry 121 is configured to receive the clock signal HC1. If the timing controller 130 continuously provides the initial pulse signal VST with the high level, the switch T2 receives the initial pulse signal VST and continuously provides the high level signal to the input end Q1, so that the input end Q1 of the driving circuitry 121 is continuously pulled to the high level, and therefore the switch T1 correspondingly becomes conductive according to the initial pulse signal VST with the high level, so that the clock signal HC1 is transmitted from the first end to the second end, and then the output end of the driving circuitry 121 outputs the clock signal HC1 as the gate signal N. Each of the driving circuitry 121 and 124 may receive the reference voltage Vss that may be used as a low voltage level for the driving circuitry.
In another embodiment, when the scan frequency of the display device 100 changes from the first frequency (as shown in
In still another embodiment, as illustrated in
In still another embodiment,
Step 510: Receiving an initial pulse signal, by a gate driver of a display device, with a high level during a period which is longer than half of a frame period of the display device, in response to a scan frequency of the display device changing from a first frequency to a second frequency, where the first frequency is higher than the second frequency.
Step 520: Outputting, according to the initial pulse signal and from the gate driver, gate signals to a plurality of gate lines that are electrically coupled to a plurality of pixels of the display device.
Step 530: Providing the initial pulse signal with the high level and correspondingly switching a clock signal from a third frequency to a fourth frequency during a period which is longer than half of a frame period of the display device by a timing controller of the display device, in response to the scan frequency of the display device changing from the first frequency to the second frequency, where the third frequency is lower than the fourth frequency.
To understand the driving method 500 according to the embodiments more easily, please refer to
Please refer to Step 530. In response to the scan frequency of the display device 100 changing from the first frequency (as shown in
In this way, referring to
A person of ordinary skill in the technical field can understand that, the steps in the driving method 500 are named according to an execution sequence thereof; the names are merely used to make the technology easier to understand but are not intended to limit the steps. The steps may be integrated into one step or may be divided into more steps, or any step may be executed in another step, which still belongs to the implementation manner of the present disclosure.
It can be learned from the foregoing implementation manners that, the certain embodiments may achieve the following advantages: mitigating the problem of abnormal brightness caused by a capacitance change in pixels due to an orientation polarization effect.
Although the specific embodiments have been disclosed in the foregoing implementation manners, the embodiments are not intended to limit the present invention. Any person of ordinary skill in the technical field of the present invention can make various changes and modifications without departing from the principle and spirit of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.
Number | Date | Country | Kind |
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105115751 A | May 2016 | TW | national |
Number | Name | Date | Kind |
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20020186196 | Park | Dec 2002 | A1 |
20080297676 | Kimura | Dec 2008 | A1 |
20140375627 | Kim | Dec 2014 | A1 |
20150187297 | Park | Jul 2015 | A1 |
Number | Date | Country |
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101533597 | Sep 2009 | CN |
102237061 | Dec 2013 | CN |
104751812 | Jul 2015 | CN |
Entry |
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Office Action issued by the State Intellectual Property Office of the Peoples Republic of China dated Mar. 15, 2018 for Application No. CN 201610556909.4. |
Office Action issued by (TIPO) Intellectual Property Office, Ministry of Economic Affairs, R. O. C. dated Nov. 23, 2016 for Application No. 105115751, Taiwan. |
Number | Date | Country | |
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20170337889 A1 | Nov 2017 | US |