CN104376820A - Display device and adjusting method thereof - Google Patents

Abstract

The invention discloses a display device and an adjusting method thereof, the display device comprises a display panel and a public voltage generating circuit, the public voltage generating circuit comprises: the storage module is provided with a plurality of storage spaces and is used for respectively storing a plurality of common voltages, wherein each common voltage corresponds to each different storage space, and each common voltage corresponds to different picture frequency ranges; the sensing module is electrically connected with the display panel and the storage module, captures the image frequency from the display panel, judges the image frequency, and outputs a first common voltage corresponding to a first image frequency range in the plurality of common voltages when the image frequency is in the first image frequency range; and outputting a second common voltage corresponding to the second picture frequency range in the plurality of common voltages when the picture frequency is in the second picture frequency range. The display device of the invention can adapt to the display modes of various picture frequencies so as to improve the picture flicker phenomenon.

Description

Display device and adjustment method thereof

technical field

The present invention relates to a display device and an adjustment method thereof, in particular to a display device and an adjustment method thereof for reducing screen flickering.

Background technique

A liquid crystal display (Liquid Crystal Display; LCD) is a flat panel display widely used at present, which has the advantages of light and thin appearance, power saving and low radiation. The working principle of the liquid crystal display device is to change the alignment state of the liquid crystal molecules in the liquid crystal layer by changing the voltage difference between the two ends of the liquid crystal layer, so as to change the light transmittance of the liquid crystal layer, and then cooperate with the light source provided by the backlight module to display images.

Please refer to FIG. 1A and FIG. 1B . FIG. 1A and FIG. 1B are schematic diagrams of the waveforms of the gray scale voltage of the display device in the prior art when it is normal and when it is abnormal. When a gate signal is input to turn on the switching TFT of the pixel of the liquid crystal display panel, the required gray-scale voltage will be stored on the liquid crystal, and the gray-scale voltage is determined by the voltage provided by the source driver corresponding to the common voltage (Common Voltage, Vcom). , that is, the liquid crystal display panel needs an adjusted Vcom signal to provide a reference point for the liquid crystal display panel. As shown in FIG. 1A , the grayscale voltage in the first period is V+, the grayscale voltage in the second period is V−, and V+ is equal to V−. By adjusting the optimal Vcom, the image will not jitter or the jitter will be minimized. However, if Vcom is not adjusted properly, V+ and V- will be unequal. As shown in Figure 1B, the gray-scale voltage in the first period is V+', The gray scale voltage in the second period is V-', and V+' is not equal to V-'. At this time, the picture shakes greatly, seriously affecting the picture quality.

And generally speaking, under the normal picture frequency of 60Hz, the optimal Vcom value will be adjusted for the flickering pattern, so that the picture does not jitter or jitters to a minimum. Previously, a variable resistor was used to adjust the Vcom voltage. Since it was manually adjusted, precise adjustment and data collection were relatively difficult. Therefore, it is currently adjusted by I2C (Inter-Integrated Circuit) digital Vcom. Due to the current customer demand for SDRRS (seamless display refresh rate switching, seamless display refresh rate switching), the screen frequency is 40Hz and the screen frequency is reduced to 48Hz when playing movies. Based on the current AHVA (wide viewing angle, Advanced Hyper-Viewing Angle) characteristics, The Vcom value adjusted based on the screen frequency of 60Hz cannot be directly switched to use at the screen frequency of 48Hz/40Hz. At this time, the corresponding optimal Vcom value is not adjusted at the screen frequency of 48/40Hz, so the degree of flickering is very serious, causing Discomfort in the human eye. In addition, when the frequency is reduced, the flickering degree of the screen will be different due to the difference between the positive and negative voltages and the common voltage, which will also cause discomfort to human eyes.

Therefore, how to design a display device that does not affect the brightness and flicker when switching between different display modes, so as to improve the image quality of the display device, is an urgent problem to be solved in the industry.

Contents of the invention

Therefore, one of the objectives of the present invention is to provide a display device and an adjustment method thereof, which can adapt to display modes of various frame frequencies, so as to improve the image flicker phenomenon.

To achieve the above object, the present invention provides a display device, which includes: a display panel for displaying images; and a common voltage generating circuit. The common voltage generation circuit includes: a storage module with multiple storage spaces for storing multiple common voltages respectively, wherein each common voltage corresponds to each different storage space, and each common voltage corresponds to a different frame frequency range; and a sensing module electrically connected to the display panel and the storage module, the sensing module captures the frame frequency of the frame from the display panel and judges the frame frequency, when the frame frequency is in the first frame In the frequency range, the sensing module outputs the first common voltage corresponding to the first picture frequency range among the plurality of common voltages to the display panel; when the picture frequency is in the second picture frequency range, the sensing module Outputting a second common voltage corresponding to the second frame frequency range among the plurality of common voltages to the display panel.

As an optional technical solution, the sensing module includes: a sensing unit used to capture and determine the frame frequency, and determine the first frame frequency when the frame frequency is within the first frame frequency range The first common voltage corresponding to the frequency range and the first location information of the first common voltage in the storage space in the storage module; when the picture frequency is in the second picture frequency range, it is determined that the second picture frequency range corresponds to The second common voltage and the second location information of the second common voltage in the storage space in the storage module; and the common voltage output unit, which is electrically connected to the storage module and the display panel, when the frame frequency When in the first picture frequency range, the common voltage output unit receives the first position information, and outputs the first common voltage corresponding to the first position information to the display panel; when the picture frequency is in the second picture frequency range , the common voltage output unit receives the second position information, and outputs the second common voltage corresponding to the second position information to the display panel.

As an optional technical solution, the sensing unit is a Y-type diode.

As an optional technical solution, the storage module is an electrically erasable programmable read-only memory.

As an optional technical solution, the multiple common voltages are written into each storage space of the storage module through timing signals and data signals.

As an optional technical solution, the display device is a liquid crystal display device.

The present invention also provides an adjustment method for a display device. The adjustment method includes: storing a plurality of common voltages in a plurality of storage spaces, and each common voltage corresponds to a different storage space, and each common voltage corresponds to a different storage space. frame frequency range; capture and determine the frame frequency of the display device; and when the frame frequency is in the first frame frequency range, output the first common voltage corresponding to the first frame frequency range among the plurality of common voltages; when the frame frequency When the frequency is in the second picture frequency range, output the second common voltage corresponding to the second picture frequency range among the plurality of common voltages.

As an optional technical solution, extracting and judging the frame frequency of the display device; and when the frame frequency is in the first frame frequency range, outputting the first common voltage corresponding to the first frame frequency range among the plurality of common voltages ; when the picture frequency is in the second picture frequency range, the step of outputting the second common voltage corresponding to the second picture frequency range in the plurality of common voltages includes: extracting and judging the picture frequency, and when the picture frequency is in the In the first picture frequency range, determine the first common voltage corresponding to the first picture frequency range and the first location information of the first common voltage in the storage space in the storage module; when the picture frequency is in the second picture frequency range In the frequency range, determine the second common voltage corresponding to the second picture frequency range and the second position information of the second common voltage in the storage space in the storage module; and when the picture frequency is in the first picture frequency range outputting the first common voltage to the display panel according to the first position information; outputting the second common voltage to the display panel according to the second position information when the picture frequency is in the second picture frequency range.

As an optional technical solution, the multiple common voltages are written into each storage space through timing signals and data signals.

As an optional technical solution, the display device is a liquid crystal display device.

Compared with the prior art, the storage module in the display device of the present invention stores Vcom corresponding to a plurality of different screen frequencies, and can output the Vcom corresponding to the screen frequency by detecting the screen frequency of the display device, so that the display device no matter The best Vcom can be adjusted under any picture frequency, so as to reduce or avoid picture flickering and improve the display quality of the display device.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

FIG. 1A and FIG. 1B are respectively schematic diagrams of waveforms when the gray scale voltage of the display device in the prior art is normal and when it is abnormal;

Figure 2 shows a block diagram of a display device according to the present invention;

Fig. 3 is a schematic diagram of a storage module according to the present invention;

FIG. 4 is a block diagram showing another embodiment of a display device according to the present invention;

FIG. 5 is a flowchart of a method for adjusting a display device according to the present invention.

Detailed ways

In order to make the technical content disclosed in this application more detailed and complete, reference may be made to the drawings and the following various specific embodiments of the present invention, and the same symbols in the drawings represent the same or similar components. However, those skilled in the art should understand that the examples provided below are not intended to limit the scope of the present invention. In addition, the drawings are only for schematic illustration and are not drawn according to their original scale.

As used herein, "about", "approximately" or "approximately" generally means that the error or range of the value is within 20%, preferably within 10%, and more preferably within five percent. If there is no explicit statement in the text, the numerical values mentioned are regarded as approximate values, that is, the error or range indicated by "about", "approximately" or "approximately".

In addition, as used herein, "coupled" or "connected" can refer to two or more components that are in direct physical or electrical contact with each other, or indirect physical or electrical contact with each other, and "coupled" ” can also mean that two or more components interoperate or act.

Please refer to FIG. 2 , which is a block diagram of a display device according to the present invention. The present invention provides a display device 1 , such as a liquid crystal display device, including a display panel 2 and a common voltage generating circuit 3 , the display panel 2 is used to display images; the common voltage generating circuit 3 is electrically connected to the display panel 2 . The common voltage generation circuit 3 includes a storage module 4 and a sensing module 5. The storage module 4 has a plurality of storage spaces for storing a plurality of common voltages respectively, wherein each common voltage corresponds to each different storage space, Each common voltage corresponds to a different frame frequency range; the sensing module 5 is electrically connected to the display panel 2 and the storage module 4, and the sensing module 5 captures the frame frequency of the display frame from the display panel 2 and judges the frame frequency , when the picture frequency is in the first picture frequency range, the sensing module 5 outputs the first common voltage corresponding to the first picture frequency range among the plurality of common voltages to the display panel 2; when the picture frequency is in the second picture frequency When in range, the sensing module 5 outputs the second common voltage corresponding to the second picture frequency range among the multiple common voltages to the display panel 2, so as to achieve the best display of the picture. The storage module may be a programmable (programmable) memory, such as an electrically erasable programmable read only memory (EEPROM) or other types of memory, but the present invention is not limited thereto.

Please refer to FIG. 3 , which is a schematic diagram of a storage module according to the present invention. For example, the display device 1 has three display modes of 40HZ, 48HZ and 60HZ, then when the screen frequency of the current display screen is in the range of 35Hz-45Hz, the sensing module 5 will capture the corresponding 35Hz-45Hz in the storage module 4. (for example, the first picture frequency) of the first common voltage, and output the first common voltage to the display panel 2, wherein the first common voltage is located in the storage space 41 of the storage module 4; when the picture frequency of the current display picture is at 45Hz- In the range of 55Hz, the sensing module 5 will capture the second common voltage corresponding to 45Hz-45Hz (such as the second screen frequency) in the storage module 4, and output the second common voltage to the display panel 2, wherein the second common voltage Located in the storage space 42 in the storage module 4; when the frame frequency of the current display screen is in the range of 55Hz-65Hz, the sensing module 5 will capture the corresponding 55Hz-65Hz (for example, the third frame frequency) in the storage module 4 the third common voltage, and output the third common voltage to the display panel 2 , where the third common voltage is located in the storage space 43 in the storage module 4 . Such different picture frequencies have corresponding common voltages, thereby reducing or eliminating picture flickering.

In other embodiments, the storage module 4 can also choose to store the fourth common voltage, the fifth common voltage..., and it depends on the number of display modes that the display device 1 has. The present invention is not limited to The number cited in this embodiment.

Among them, the above-mentioned multiple common voltages can be written into each storage space of the storage module 4 by using the I2C serial data signal (SDA) and the serial timing signal (SCL), such as adjusting the screen frequency at 40Hz (or the corresponding first A common voltage (Vcom1) is stored in the storage space 41; the adjusted (or corresponding second common voltage (Vcom2)) at the picture frequency of 48Hz is stored in the storage space 42; the adjusted picture frequency of 60Hz (or the corresponding second common voltage (Vcom2) Three common voltages ( Vcom3 ) are stored in the memory space 43 .

The display panel 2 has a gate driver, the common voltage output unit 7 is electrically connected to the gate driver 8, the above-mentioned adjusted common voltage, namely the first common voltage, is output to the gate driver 8, and the gate driver 8 is connected to a plurality of pixel electrodes .

Please refer to FIG. 4 , which is a block diagram of another embodiment of a display device according to the present invention. In this embodiment, the sensing module 5 includes a sensing unit 6 and a common voltage output unit 7 . The sensing unit 6 is used to capture and determine the frame frequency, and when the frame frequency is in the first frame frequency range, determine the first common voltage corresponding to the first frame frequency range and the first common voltage in the storage The first location information of the storage space in the module 4; when the picture frequency is in the second picture frequency range, determine the second common voltage corresponding to the second picture frequency range and the second common voltage in the storage module 4 The second location information of the storage space. The common voltage output unit 7 is electrically connected to the storage module 4 and the display panel 2. When the picture frequency is in the first picture frequency range, the common voltage output unit 7 receives the first position information and outputs the corresponding position information of the first position information. The first common voltage is supplied to the display panel 2; when the picture frequency is in the second picture frequency range, the common voltage output unit 7 receives the second position information, and outputs the second common voltage corresponding to the second position information to the display Panel 2. Specifically, the sensing unit 6 is, for example, a Y-type diode (YDIO).

Please refer to FIG. 5 , which is a flow chart of a method for adjusting a display device according to the present invention. The present invention also provides a method for adjusting a display device. The above-mentioned display device is, for example, a liquid crystal display device. The adjustment method includes the following steps:

First, as step S1: storing multiple common voltages in multiple storage spaces, and each common voltage corresponds to each storage space, and each common voltage corresponds to a frame frequency range;

Then as step S2: capture and determine the frame frequency of the display device; and

Finally as step S3: when the picture frequency is in the first picture frequency range, output the first common voltage corresponding to the first picture frequency range among the plurality of common voltages; when the picture frequency is in the second picture frequency range, output The second common voltage corresponding to the second frame frequency range among the plurality of common voltages.

Of course, the above-mentioned "capturing and judging the frame frequency of the display device; and when the frame frequency is in the first frame frequency range, output the first common voltage corresponding to the first frame frequency range among the plurality of common voltages; When the frequency is in the second picture frequency range, the step of outputting the "second common voltage corresponding to the second picture frequency range" among the plurality of common voltages includes the following steps, for example:

Capture and determine the frame frequency, and when the frame frequency is in the first frame frequency range, determine the first common voltage corresponding to the first frame frequency range and the storage space of the first common voltage in the storage module the first position information; when the picture frequency is in the second picture frequency range, determine the second common voltage corresponding to the second picture frequency range and the second common voltage in the storage space of the storage module location information; and

When the picture frequency is in the first picture frequency range, output the first common voltage to the display panel according to the first position information; when the picture frequency is in the second picture frequency range, output the first common voltage according to the second position information Two common voltages are connected to the display panel.

Wherein the above-mentioned storage space is located on the storage module, the storage module can be, for example, a programmable (programmable) memory, such as an electrically erasable programmable read-only memory (electrically erasable programmable read only memory, EEPROM) or other types of memory, however The present invention is not limited to the above. For example, the display device has three display modes of 40HZ, 48HZ and 60HZ, then when the screen frequency of the current display screen is in the range of 35Hz-45Hz, the sensing module will capture the corresponding 35Hz-45Hz in the storage module (for example, the first A picture frequency) of the first common voltage, and output the first common voltage to the display panel, wherein the first common voltage is located in the storage space in the storage module; when the picture frequency of the current display picture is in the range of 45Hz-55Hz, the sensing The module will capture the second common voltage corresponding to 45Hz-45Hz (for example, the second screen frequency) in the storage module, and output the second common voltage to the display panel, wherein the second common voltage is located in the storage space in the storage module; When the screen frequency of the current display screen is in the range of 55Hz-65Hz, the sensing module will capture the third common voltage corresponding to 55Hz-65Hz (for example, the third screen frequency) in the storage module, and output the third common voltage to the display panel, wherein the third common voltage is located in the storage space in the storage module 4 . In other embodiments, the storage module can also choose to store the fourth common voltage, the fifth common voltage..., and it depends on the number of display modes that the display device 1 has. The present invention is not limited to this The exemplified quantity of the embodiment.

Among them, the I2C (inter-integrated circuit) interface can be used to write the above-mentioned common voltages corresponding to different screen frequencies into the storage module through the serial data signal (SDA) and the serial timing signal (SCL). each storage space. For example, store the adjusted (or corresponding) first common voltage (Vcom1) at a picture frequency of 40Hz in the storage space; store the adjusted (or corresponding) second common voltage (Vcom2) at a picture frequency of 48Hz in the storage space ; Store the adjusted (or corresponding) third common voltage ( Vcom3 ) at the frame frequency of 60 Hz in the storage space.

To sum up, the storage module in the display device of the present invention stores Vcom corresponding to a plurality of different picture frequencies, and can output the Vcom corresponding to the picture frequency by detecting the picture frequency of the display device, so that no matter where the display device is The optimal Vcom can be adjusted under various picture frequencies, so as to reduce or avoid picture flickering and improve the display quality of the display device.

Through the above detailed description of the preferred embodiments, it is hoped that the characteristics and spirit of the present invention can be described more clearly, and the protection scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various changes and equivalent arrangements within the protection scope of the appended claims of the present invention. Therefore, the protection scope of the claims applied for in the present invention should be interpreted in the broadest way based on the above description, so as to cover all possible changes and equivalent arrangements.

Claims (10)

1. a display device, is characterized in that this display device comprises:

Display panel, in order to display frame; And

Public voltage generating circuit, comprising:

Store module, there is multiple storage space, in order to store multiple common electric voltage respectively, wherein each common electric voltage each different storage space corresponding, and the frame frequency scope that each common electric voltage is corresponding different; And

Sensing module, be electrically connected this display panel and this storage module, this sensing module captures the frame frequency of this picture from this display panel and judges this frame frequency, when this frame frequency is positioned at the first frame frequency scope, this sensing module export in the plurality of common electric voltage to should the first common electric voltage of the first frame frequency scope to this display panel; When this frame frequency is positioned at the second frame frequency scope, this sensing module export in the plurality of common electric voltage to should the second common electric voltage of the second frame frequency scope to this display panel.

2. display device as claimed in claim 1, is characterized in that this sensing module comprises:

Sensing cell, this sensing cell is in order to capture and to judge this frame frequency, and when this frame frequency is positioned at the first frame frequency scope, determine the primary importance information of this first common electric voltage that this first frame frequency scope is corresponding and the storage space of this first common electric voltage in this storage module; When this frame frequency is positioned at the second frame frequency scope, determine the second place information of this second common electric voltage that this second frame frequency scope is corresponding and the storage space of this second common electric voltage in this storage module; And

Common electric voltage output unit, this storage module of this electric connection and this display panel, when this frame frequency is positioned at the first frame frequency scope, this common electric voltage output unit receives this primary importance information, and exports this first common electric voltage corresponding to this primary importance information to this display panel; When this frame frequency is positioned at the second frame frequency scope, this common electric voltage output unit receives this second place information, and exports this second common electric voltage corresponding to this second place information to this display panel.

3. display device as claimed in claim 2, is characterized in that this sensing cell is Y type diode.

4. display device as claimed in claim 1, is characterized in that this storage module is EEPROM (Electrically Erasable Programmable Read Only Memo).

5. display device as claimed in claim 1, is characterized in that the plurality of common electric voltage writes each storage space of this storage module by clock signal and data-signal.

6. display device as claimed in claim 1, is characterized in that this display device is liquid crystal indicator.

7. a method of adjustment for display device, is characterized in that this method of adjustment comprises:

Store multiple common electric voltage in multiple storage space, and each common electric voltage each different storage space corresponding, the frame frequency scope that each common electric voltage is corresponding different;

Capture and judge the frame frequency of display device; And

When this frame frequency is positioned at the first frame frequency scope, export in the plurality of common electric voltage should the first common electric voltage of the first frame frequency scope; When this frame frequency is positioned at the second frame frequency scope, export in the plurality of common electric voltage should the second common electric voltage of the second frame frequency scope.

8. the method for adjustment of display device as claimed in claim 7, is characterized in that this acquisition and judges the frame frequency of display device; And deserve this frame frequency when being positioned at the first frame frequency scope, export in the plurality of common electric voltage should the first common electric voltage of the first frame frequency scope; When this frame frequency is positioned at the second frame frequency scope, to export in the plurality of common electric voltage should the step of the second common electric voltage of the second frame frequency scope comprise:

Capture and judge this frame frequency, and when this frame frequency is positioned at the first frame frequency scope, determining the primary importance information of this first common electric voltage that this first frame frequency scope is corresponding and the storage space of this first common electric voltage in this storage module; When this frame frequency is positioned at the second frame frequency scope, determine the second place information of this second common electric voltage that this second frame frequency scope is corresponding and the storage space of this second common electric voltage in this storage module; And

When this frame frequency is positioned at the first frame frequency scope, export this first common electric voltage to this display panel according to this primary importance information; When this frame frequency is positioned at the second frame frequency scope, export this second common electric voltage to this display panel according to this second place information.

9. the method for adjustment of display device as claimed in claim 7, is characterized in that the plurality of common electric voltage writes each storage space by clock signal and data-signal.

10. the method for adjustment of display device as claimed in claim 7, is characterized in that this display device is liquid crystal indicator.