CN101751878A - Method, device and system for adjusting display contrast of LCD screen - Google Patents

Abstract

The invention discloses a method, a device and a system for adjusting a display contrast of an LCD screen, which are suitable for the field of liquid crystal displays. The method comprises the following steps of: setting gray area division information for the LCD screen of a standard liquid crystal module, and recording the gray information represented by the LCD screen when the standard liquid crystal module is operated according to the information; operating a liquid crystal module to be adjusted according to preset gray area division information, and recording the gray information represented by the LCD screen of the liquid crystal module to be adjusted; and adjusting the display contrast of the LCD screen of the liquid crystal module to be adjusted according to the gray information of the LCD screen of the liquid crystal module to be adjusted and the gray information of the LCD screen of the standard liquid crystal module. Through the method, the LCD screen of the liquid crystal module to be adjusted is divided into a plurality of areas with increasing gray values; the brightest state and the darkest state which the liquid crystal module can clearly display are displayed; the display contrast of the LCD screen of the liquid crystal module to be adjusted is adjusted, so that the difference between the display contrast of the liquid crystal module to be adjusted and the display contrast of the standard liquid crystal module is minimized.

Description

A kind of method, Apparatus and system of adjusting liquid crystal display demonstration contrast

Technical field

The invention belongs to field of liquid crystal display, relate in particular to a kind of method, Apparatus and system that liquid crystal display shows contrast of adjusting.

Background technology

In the manufacturing process of liquid crystal module, because the influence of the factors such as backlight illumination of liquid crystal display, cause with batch each liquid crystal module in the demonstration contrast of liquid crystal display and inequality, even obvious difference, therefore before dispatching from the factory, be necessary according to judging with the demonstration contrast of standard liquid crystal module liquid crystal display and adjusts, so that the difference minimum of the demonstration contrast of the demonstration contrast of liquid crystal display and standard liquid crystal module liquid crystal display in the liquid crystal module of batch process.

Summary of the invention

The purpose of the embodiment of the invention is to provide a kind of method that liquid crystal display shows contrast of adjusting, so that the demonstration contrast of liquid crystal display and the difference minimum of standard liquid crystal module in the liquid crystal module of producing in batches.

The embodiment of the invention is achieved in that a kind of method that liquid crystal display shows contrast of adjusting, and said method comprising the steps of:

The gray areas division information of the liquid crystal module that sets up standard liquid crystal display, and the record standard liquid crystal module half-tone information that liquid crystal display is presented during according to the operation of this information, the gray-scale value of the gray areas that described gray areas division information is divided are and increase progressively variation;

Move liquid crystal module to be adjusted according to default described gray areas division information, and write down the half-tone information that liquid crystal module liquid crystal display to be adjusted is presented;

According to the half-tone information of liquid crystal module liquid crystal display to be adjusted and the half-tone information of standard liquid crystal module liquid crystal display, adjust the demonstration contrast of liquid crystal module liquid crystal display to be adjusted.

Another purpose of the embodiment of the invention is to provide a kind of device that liquid crystal display shows contrast of adjusting, and described device comprises:

The standard liquid crystal module is provided with module, the gray areas division information of liquid crystal module liquid crystal display is used to set up standard, and the record standard liquid crystal module half-tone information that liquid crystal display is presented during according to the operation of this information, the gray-scale value of the gray areas that described gray areas division information is divided is and increases progressively variation;

Liquid crystal module information logging modle to be adjusted is used for writing down the half-tone information that liquid crystal module liquid crystal display to be adjusted is presented after the default described gray areas division information of module is set according to described standard liquid crystal module moves liquid crystal module to be adjusted; And

Show the contrast adjusting module, be used for the demonstration contrast of liquid crystal module liquid crystal display to be adjusted being adjusted according to the half-tone information of described liquid crystal module liquid crystal display to be adjusted and the half-tone information of standard liquid crystal module liquid crystal display.

Another purpose of the embodiment of the invention is to provide a kind of system that liquid crystal display shows contrast that adjusts, and described system adopts aforesaid adjustment liquid crystal display to show the device of contrast, and described device places a main frame, and described system also comprises:

Anchor clamps are built-in with communication module, burning module and single-chip microcomputer with described main-machine communication, comprise the base and the support of fixed standard liquid crystal module or liquid crystal module to be adjusted;

Image collecting device is fixed on the support of described anchor clamps, and the position of the liquid crystal module on the described base is used to gather the display image of standard liquid crystal module or liquid crystal module to be adjusted and is sent to described main frame;

Described main frame sends to described single-chip microcomputer and adjusts the order that liquid crystal module liquid crystal display to be adjusted shows contrast, and after the examination accent is finished, send the burning order to described single-chip microcomputer, the described burning module of described Single-chip Controlling advances liquid crystal module to be adjusted with the current state burning.

In the embodiment of the invention, liquid crystal module liquid crystal display to be adjusted is divided into a plurality of zones of gray-scale value incremental variations, realize showing simultaneously that this liquid crystal module can know the brightest attitude and the darkest attitude of demonstration, and the brightest attitude of contrast standard liquid crystal module and the darkest attitude display message, demonstration contrast to liquid crystal module to be adjusted is adjusted, thereby can make the difference minimum of the demonstration contrast of liquid crystal module to be adjusted and standard liquid crystal module.

Description of drawings

Fig. 1 is the realization flow figure that the adjustment liquid crystal display that provides of the embodiment of the invention shows the method for contrast;

Fig. 2 is the synoptic diagram that the monoblock liquid crystal display is divided into a plurality of gray areas that the embodiment of the invention provides;

Fig. 3 is the structure principle chart that the adjustment liquid crystal display that provides of the embodiment of the invention shows the device of contrast;

Fig. 4 is a kind of system architecture synoptic diagram of device shown in Figure 3.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

In the embodiment of the invention, liquid crystal module liquid crystal display to be adjusted is divided into a plurality of zones of gray-scale value incremental variations, realize showing simultaneously that liquid crystal module to be adjusted can know the brightest attitude and the darkest attitude of demonstration, and, the demonstration contrast of liquid crystal module liquid crystal display to be adjusted is adjusted according to the brightest attitude and the darkest attitude display message of standard liquid crystal module liquid crystal display.

The adjustment liquid crystal display that Fig. 1 shows the embodiment of the invention to be provided shows the realization flow of the method for contrast, and details are as follows:

In step S101, the gray areas division information of the liquid crystal module that sets up standard liquid crystal display, and the record standard liquid crystal module is according to this information operation half-tone information that liquid crystal display presented, and the gray-scale value of the gray areas that this gray areas division information is divided is and increases progressively variation.

In the embodiment of the invention, the gray areas division information comprises the quantity information of zoning to some extent, the monoblock liquid crystal display can be divided into a plurality of gray areas according to this information, as shown in Figure 2, zone 1 to n gray-scale value is and increases progressively variation, is 0 as the gray-scale value in zone 1, and the gray-scale value of regional n is 255, the gray-scale value geometric ratio of zone line increases, and can liquid crystal display be divided into 16 or the vertical zone of greater number level according to actual conditions when specifically implementing.

The standard liquid crystal module will present corresponding half-tone information according to this gray areas division information operation back liquid crystal display, and average gray value, each regional boundary coordinate and the human eye that this half-tone information comprises each gray areas can be known the coordinate of the critical boundary of identification.As shown in Figure 2, hypothesis district m is the zone that human eye can be known the gray-scale value minimum of recognizing the border, can know the zone of the gray-scale value maximum of recognizing the border and regional 2m is a human eye, the critical boundary of identification then can be known in the border of then regional m and regional 2m for human eye.

In the embodiment of the invention, the method for record delimitation and critical boundary has two kinds: manually recording method and based on gray scale vertical projection method, and the principle division is as follows:

Manually recording method: with reference to Fig. 2, boundary line between each zone of liquid crystal display central authorities can obviously be seen, and the zone boundary that human eye can't be distinguished can appear in the liquid crystal display both sides, can manually note tangible boundary line as the border this moment, and will by liquid crystal display mediad lowest gray value region direction and to first boundary line that can't know differentiation that the highest gray-scale value region direction occurs as critical boundary, as being critical boundary by the border of the regional m of liquid crystal display mediad lowest gray value region direction with by the border of the regional 2m of the highest gray-scale value region direction of liquid crystal display mediad among Fig. 2.

Based on gray scale vertical projection method: gather the image that standard liquid crystal module liquid crystal display moves under this default gray areas division information, if image is I (x, y), size is M * N, wherein (N represents the line number of liquid crystal display pixel for x, the y) coordinate of presentation video pixel, M represents the columns of liquid crystal display pixel, and then the vertical Gray Projection function of this image is:

$\mathrm{PV}\left(x\right)=\underset{y=1}{\overset{N}{\mathrm{\Σ}}}I(x,y)$

Wherein PV is vertical Gray Projection curvilinear function.Owing to have different gray-scale values in the zones of different,, on vertical Gray Projection figure, can form catastrophe point so on the zone boundary, have the gray-scale value sudden change certainly.

Further, better and removal The noise uses median filter method to carry out smoothing processing to above-mentioned vertical Gray Projection curve for image effect, handles function and is:

$\mathrm{PVF}\left(x\right)=\frac{1}{K+1}\underset{i=x-k/2}{\overset{x+K/2}{\mathrm{\Σ}}}\mathrm{PV}\left(i\right)$

Wherein K is the filter window width, and is relevant with the image size.

Default critical boundary threshold value is θ ₁With boundary threshold be θ ₂, obtain the gray-scale value of border catastrophe point and any gray-scale value before it according to above-mentioned PV (x) or PVF (x) function, and with σ ₁Represent the gray-scale value of current border catastrophe point and the difference of the gray-scale value of any before it, judge frontier point and critical boundary point by following formula, and record:

θ ₁＜σ ₁＜θ ₂Critical boundary

σ ₁＞θ ₂The border

In step S102, move liquid crystal module to be adjusted according to default gray areas division information, and write down the half-tone information that liquid crystal module liquid crystal display to be adjusted is presented.

Gather the liquid crystal module to be adjusted image that liquid crystal display is presented during operation under default gray areas division information, the half-tone information of record comprises each regional average gray value, because liquid crystal module to be adjusted and standard liquid crystal module are moved under same gray areas division information, therefore the boundary coordinate that obtains is identical with the boundary coordinate of standard liquid crystal module, and each regional gray-scale value is equally and increases progressively variation.

In step S103,, adjust the demonstration contrast of liquid crystal module liquid crystal display to be adjusted according to the half-tone information of liquid crystal module to be adjusted and the half-tone information of standard liquid crystal module.

In the embodiment of the invention, the adjustment of demonstration contrast to be adjusted is divided into coarse adjustment and fine tuning dual mode, and principle is as follows:

Coarse adjustment: based on the comparison of the overall gray value of liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display.Read each regional average gray value of standard liquid crystal module liquid crystal display, be designated as (A ₁, A ₂..., A _n), read each regional average gray value of liquid crystal module liquid crystal display to be adjusted, be designated as (B ₁, B ₂..., B _n), with σ _2newAnd σ _2oldThe overall intensity difference of liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display before representing respectively to adjust current and last time, and overall intensity difference limen value is set is σ ₂, during initialization, σ _2newAnd σ _2oldCan get greater than σ at random ₂Value.Calculate the overall intensity difference of current liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display:

${\mathrm{\σ}}_{2\mathrm{new}}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}|A_i-B_i|$

If σ _2new＜σ ₂, then being judged as does not need coarse adjustment; If σ _2new＞σ ₂, judge further then whether current adjustment is coarse adjustment for the first time, is the demonstration contrast of then trying to transfer liquid crystal module liquid crystal display to be adjusted up or down, and upgrade σ _2oldBe the σ before adjusting _2newIf not coarse adjustment for the first time, and σ _2old＜σ _2new, then reduce the demonstration contrast of liquid crystal module liquid crystal display to be adjusted, if σ _2old＞σ _2new, then raise the demonstration contrast of liquid crystal module liquid crystal display to be adjusted; And after adjusting, recomputate each regional average gray value (B of liquid crystal module liquid crystal display to be adjusted ₁, B ₂..., B _n) and σ _2new, compare σ again _2newAnd σ ₂Relation, repeat above-mentioned steps, finish coarse adjustment.

Fine tuning: based on the critical boundary position and the threshold limit value σ of standard liquid crystal module liquid crystal display ₁Application in liquid crystal module to be adjusted.With the critical boundary of standard liquid crystal module liquid crystal display critical boundary as liquid crystal module liquid crystal display to be adjusted, and with σ _3newAnd σ _3oldThe average gray value in liquid crystal module liquid crystal display critical boundary the right and left to be adjusted zone is poor before representing respectively to adjust current and last time, if σ _3new＞σ ₁, then being judged as does not need fine tuning; If σ _3new＜σ ₁, judge further then whether current adjustment is fine tuning for the first time, is the demonstration contrast that then goes up or try to transfer liquid crystal module liquid crystal display to be adjusted downwards, and upgrade σ _3oldBe the σ before adjusting _3newIf not fine tuning for the first time, and σ _3old＜σ _3new, then reduce the demonstration contrast of liquid crystal module liquid crystal display to be adjusted, if σ _3old＞σ _3new, then raise the demonstration contrast of liquid crystal module liquid crystal display to be adjusted; And after adjusting, recomputate each regional average gray value (B of liquid crystal module liquid crystal display to be adjusted ₁, B ₂..., B _n) and σ _3new, compare σ again _3newAnd σ ₁Relation, repeat above-mentioned steps, finish fine tuning.

One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method can instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, and this storage medium can be ROM/RAM, disk, CD etc.

The adjustment liquid crystal display that Fig. 3 shows the embodiment of the invention to be provided shows the structural principle of the device of contrast, for convenience of description, only show the part relevant with the embodiment of the invention, all or part of module wherein can be software unit, hardware cell or software and hardware combining unit.

With reference to Fig. 3, the standard liquid crystal module is provided with the module 31 liquid crystal module liquid crystal display gray-scale displayed partition information that is used to set up standard, this gray areas division information comprises the information such as quantity of zoning to some extent, and the record standard liquid crystal module half-tone information that liquid crystal display is presented during according to the operation of this information, wherein, the standard liquid crystal module is moved the half-tone information that presents according to this information and is comprised the coordinate that each regional average gray value, each regional boundary coordinate and human eye can be known the critical boundary of identification; The gray-scale value of the gray areas that this gray areas division information is divided is and increases progressively variation.Manual recording method is arranged the method that border and critical boundary be set and based on two kinds of gray scale vertical projection methods, concrete principle is as indicated above, repeats no more herein.

Liquid crystal module information logging modle 32 to be adjusted is used for writing down the half-tone information that liquid crystal module liquid crystal display to be adjusted is presented after the default described gray areas division information of module 31 are set according to the standard liquid crystal module move liquid crystal module to be adjusted; The half-tone information of liquid crystal module liquid crystal display wherein to be adjusted comprises each regional average gray value.

Show that contrast condition judgment module 33 is used for the half-tone information that standard liquid crystal module liquid crystal display that the standard of comparison liquid crystal module is provided with module 31 records is presented, the half-tone information that presented of liquid crystal module liquid crystal display to be adjusted with record in the liquid crystal module information logging modle 32 to be adjusted, judge whether to need to adjust contrast, because liquid crystal module to be adjusted and standard liquid crystal module are moved under same gray areas division information, therefore the boundary coordinate that obtains is identical with the boundary coordinate of standard liquid crystal module, and each regional gray-scale value is equally and increases progressively variation.Wherein judgment mode is two kinds, a kind of is comparison based on liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display overall gray value, if the overall intensity difference of current liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display during less than predetermined threshold value, does not then need to adjust, otherwise needs to adjust; Another kind is critical boundary position and the threshold limit value σ based on standard liquid crystal module liquid crystal display ₁Application in liquid crystal module to be adjusted, with the critical boundary of standard liquid crystal module liquid crystal display critical boundary as liquid crystal module liquid crystal display to be adjusted, if the difference of the average gray value in current liquid crystal module critical boundary the right and left to be adjusted zone is during greater than preset threshold value, then do not need to adjust, otherwise need to adjust.

Show that contrast adjusting module 34 is when showing that being judged as of contrast condition judgment module 33 needs to adjust the demonstration contrast, demonstration contrast to liquid crystal module liquid crystal display to be adjusted is adjusted, corresponding with two kinds of judgment modes that show contrast condition judgment module 33, when showing that the relatively back judgement of contrast condition judgment module 33 based on liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display overall gray value needs to adjust, show that the demonstration contrast of 34 pairs of liquid crystal module liquid crystal displays to be adjusted of contrast adjusting module is carried out coarse adjustment; When showing critical boundary position and the threshold limit value σ of contrast condition judgment module 33 based on standard liquid crystal module liquid crystal display ₁Judge when needing to adjust in the application of liquid crystal module to be adjusted, show that the demonstration contrast of 34 pairs of liquid crystal module liquid crystal displays to be adjusted of contrast adjusting module is carried out fine tuning.Wherein the principle of coarse adjustment and system is as indicated above, repeats no more herein.

Fig. 4 is a kind of system architecture synoptic diagram of device shown in Figure 3, the base 11 of anchor clamps 1 is used for fixing standard liquid crystal module or liquid crystal module to be adjusted, image collecting device 2 is fixed on the support 12 of anchor clamps 1, the position of the liquid crystal module on the base 11, image collecting device 2 is sent to main frame 3 with the standard liquid crystal module that collects or the display image of liquid crystal module to be adjusted with wired (as USB interface) or wireless mode, main frame 3 is built-in with the device that adjustment liquid crystal display shown in Figure 3 shows contrast, main frame 3 and anchor clamps 1 are connected by serial bus, and anchor clamps 1 are built-in with the communication module that communicates with main frame, burning module and single-chip microcomputer.Wherein a main frame can according to circumstances connect a plurality of anchor clamps and image collecting device.

At first, the standard liquid crystal module is fixed on the base 11, the standard liquid crystal module is by the Single-chip Controlling in the anchor clamps, after energising, liquid crystal display is divided into a plurality of gray areas by single-chip microcomputer, image collecting device 2 collects the standard liquid crystal module that is sent in the main frame 3 after the image of standard liquid crystal module module 31 is set, the standard liquid crystal module is provided with the module 31 liquid crystal module liquid crystal display gray-scale displayed partition information that sets up standard, and the record standard liquid crystal module moves the half-tone information that presents according to this information, and is specifically as indicated above.

Standard liquid crystal module on the base 11 is changed to liquid crystal module to be adjusted, according to the standard liquid crystal module described gray areas division information default in the module 31 is set and moves liquid crystal module to be adjusted, image collecting device 2 collects the liquid crystal module information logging modle 32 to be adjusted that is sent to after the image of liquid crystal module to be adjusted in the main frame 3, by liquid crystal module information logging modle 32 these information of record to be adjusted, show the half-tone information of contrast condition judgment module 33 liquid crystal module liquid crystal displays more to be adjusted and the half-tone information of standard liquid crystal module liquid crystal display, need to judge whether to adjust, if then control shows the demonstration contrast of contrast adjusting module 34 adjustment liquid crystal module liquid crystal display to be adjusted, being specially main frame 3 controls liquid crystal module to be adjusted by serial ports, make it to brighten, deepening, to reach the purpose that shows that contrast is adjusted, this part is the reception that anchor clamps 1 interior single-chip microcomputer is finished order.After adjustment was finished, main frame 3 was promptly controlled burning module liquid crystal module to be adjusted is advanced in the current state burning by the order of serial ports to liquid crystal module transmission burning to be adjusted after single-chip microcomputer receives this order.

In the embodiment of the invention, liquid crystal module liquid crystal display to be adjusted is divided into gray-scale value is a plurality of zones that increase progressively variation, realize showing simultaneously that this liquid crystal module can know the brightest attitude and the darkest attitude of demonstration, and the brightest attitude of contrast standard liquid crystal module and the darkest attitude display message, demonstration contrast to liquid crystal module liquid crystal display to be adjusted is adjusted, thereby can make the difference minimum of liquid crystal module to be adjusted and standard liquid crystal module displays contrast, wherein can select manual recording method flexibly for use and border and critical boundary are set based on gray scale vertical projection method, the adjustment mode of coarse adjustment and two kinds of contrasts of fine tuning more make the be near the mark demonstration contrast of liquid crystal module of liquid crystal module to be adjusted in conjunction with utilization.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1. adjust the method that liquid crystal display shows contrast for one kind, it is characterized in that, said method comprising the steps of:

The gray areas division information of the liquid crystal module that sets up standard liquid crystal display, and the record standard liquid crystal module half-tone information that liquid crystal display is presented during according to the operation of this information, the gray-scale value of the gray areas that described gray areas division information is divided are and increase progressively variation;

Move liquid crystal module to be adjusted according to default described gray areas division information, and write down the half-tone information that liquid crystal module liquid crystal display to be adjusted is presented;

According to the half-tone information of liquid crystal module liquid crystal display to be adjusted and the half-tone information of standard liquid crystal module liquid crystal display, adjust the demonstration contrast of liquid crystal module liquid crystal display to be adjusted.

2. the method for claim 1 is characterized in that, the described half-tone information that standard liquid crystal module liquid crystal display presents comprises the coordinate that each regional average gray value, each regional boundary coordinate and human eye can be known the critical boundary of identification; The half-tone information that liquid crystal module liquid crystal display to be adjusted presents comprises each regional average gray value.

3. method as claimed in claim 2, it is characterized in that, in the step of the described record standard liquid crystal module half-tone information that liquid crystal display is presented during according to the operation of this information, the step that writes down the coordinate of the critical boundary that each regional boundary coordinate in the described half-tone information and human eye can know identification is specially:

The shown image of liquid crystal display when collection standard liquid crystal module is moved under default described gray areas division information;

According to formula

Obtain the gray-scale value of border catastrophe point and any gray-scale value before it, wherein PV (x) is vertical Gray Projection curvilinear function, I (x, y) be the image slices vegetarian refreshments, N is the line number of liquid crystal display pixel, and PVF (x) is for carrying out the function that medium filtering is handled to PV (x), and K is the filter window width;

With σ ₁Represent the gray-scale value of current border catastrophe point and the difference of the gray-scale value of any before it, if θ ₁＜σ ₁＜θ ₂, then this border, catastrophe point place is a critical boundary; If σ ₁＞θ ₂, then this border, catastrophe point place is the border; θ wherein ₁And θ ₂Be respectively default critical boundary threshold value and boundary threshold.

4. method as claimed in claim 2 is characterized in that, described according to the half-tone information of liquid crystal module to be adjusted and the half-tone information of standard liquid crystal module, the step of adjusting the demonstration contrast of liquid crystal module liquid crystal display to be adjusted comprises:

Read each regional average gray value of standard liquid crystal module liquid crystal display;

Read each regional average gray value of liquid crystal module liquid crystal display to be adjusted;

According to each regional average gray value of described standard liquid crystal module liquid crystal display and each regional average gray value of described liquid crystal module liquid crystal display to be adjusted, calculate the overall intensity difference of current liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display;

Whether the overall intensity difference of judging described current liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display is greater than default overall intensity difference limen value;

If the overall intensity difference of current liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display is greater than default overall intensity difference limen value, then try to transfer the demonstration contrast of liquid crystal module liquid crystal display to be adjusted up or down, and according to the overall intensity difference of liquid crystal module to be adjusted after adjusting and standard liquid crystal module liquid crystal display and the relation of the overall intensity difference limen value of presetting, continue to adjust the demonstration contrast of liquid crystal module liquid crystal display to be adjusted, until finishing coarse adjustment.

5. method as claimed in claim 4 is characterized in that, described according to the half-tone information of liquid crystal module to be adjusted and the half-tone information of standard liquid crystal module, the step of adjusting the demonstration contrast of liquid crystal module liquid crystal display to be adjusted also comprises:

With the described critical boundary of standard liquid crystal module liquid crystal display critical boundary as liquid crystal module liquid crystal display to be adjusted;

Whether the difference of average gray value in critical boundary the right and left zone of judging liquid crystal module liquid crystal display to be adjusted is less than default threshold limit value;

If the difference of the average gray value in critical boundary the right and left zone of liquid crystal module liquid crystal display to be adjusted is less than default threshold limit value, then try to transfer the demonstration contrast of liquid crystal module liquid crystal display to be adjusted up or down, and according to the difference of the average gray value in liquid crystal module liquid crystal display critical boundary the right and left to be adjusted zone after the adjustment and the relation of the threshold limit value of presetting, continue to adjust the demonstration contrast of liquid crystal module liquid crystal display to be adjusted, until finishing fine tuning.

6. adjust the device that liquid crystal display shows contrast for one kind, it is characterized in that described device comprises:

The standard liquid crystal module is provided with module, the gray areas division information of liquid crystal module liquid crystal display is used to set up standard, and the record standard liquid crystal module half-tone information that liquid crystal display is presented during according to the operation of this information, the gray-scale value of the gray areas that described gray areas division information is divided is and increases progressively variation;

Liquid crystal module information logging modle to be adjusted is used for writing down the half-tone information that liquid crystal module liquid crystal display to be adjusted is presented after the default described gray areas division information of module is set according to described standard liquid crystal module moves liquid crystal module to be adjusted; And

Show the contrast adjusting module, be used for the demonstration contrast of liquid crystal module liquid crystal display to be adjusted being adjusted according to the half-tone information of described liquid crystal module liquid crystal display to be adjusted and the half-tone information of standard liquid crystal module liquid crystal display.

7. device as claimed in claim 6 is characterized in that, the described half-tone information that standard liquid crystal module liquid crystal display is presented comprises the coordinate that each regional average gray value, each regional boundary coordinate and human eye can be known the critical boundary of identification; The half-tone information that liquid crystal module liquid crystal display to be adjusted is presented comprises each regional average gray value;

Described device also comprises:

Show the contrast condition judgment module, the half-tone information of the liquid crystal module liquid crystal display to be adjusted of more described liquid crystal module information logging modle record to be adjusted and the half-tone information that described standard liquid crystal module is provided with the standard liquid crystal module liquid crystal display that writes down in the module, judge whether the demonstration contrast of needs adjustment liquid crystal module liquid crystal display to be adjusted, and when being judged as the needs adjustment, trigger described demonstration contrast adjusting module and adjust.

8. device as claimed in claim 7 is characterized in that, described standard liquid crystal module is provided with module and is used to gather standard liquid crystal module shown image of liquid crystal display during operation under default described gray areas division information; According to formula

Obtain the gray-scale value of border catastrophe point and any gray-scale value before it, wherein PV (x) is vertical Gray Projection curvilinear function, I (x, y) be the image slices vegetarian refreshments, the line number of the liquid crystal display pixel that N is, PVF (x) is for carrying out the function that medium filtering is handled to PV (x), and K is the filter window width; With σ ₁Represent the gray-scale value of current border catastrophe point and the difference of the gray-scale value of any before it, if θ ₁＜σ ₁＜θ ₂, it is critical boundary that then described standard form is provided with this border, catastrophe point place of module records; If σ ₁＞θ ₂, it is the border that then described standard form is provided with this border, catastrophe point place of module records; θ wherein ₁And θ ₂Be respectively default critical boundary threshold value and boundary threshold.

9. device as claimed in claim 7, it is characterized in that, described demonstration contrast condition judgment module is used to read each regional average gray value of standard liquid crystal module liquid crystal display and each regional average gray value of liquid crystal module liquid crystal display to be adjusted, according to each regional average gray value of described standard liquid crystal module liquid crystal display and each regional average gray value of described liquid crystal module liquid crystal display to be adjusted, calculate the overall intensity difference of current liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display; Whether the overall intensity difference of judging described current liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display is greater than default overall intensity difference limen value;

When described demonstration contrast adjusting module is judged as needs adjustment contrast in described demonstration contrast condition judgment module, the demonstration contrast of liquid crystal module liquid crystal display to be adjusted is transferred in examination up or down, and according to the overall intensity difference of liquid crystal module to be adjusted and standard liquid crystal module liquid crystal display after the adjustment and the demonstration contrast of the relation continuation adjustment liquid crystal module liquid crystal display to be adjusted of the overall intensity difference limen value of presetting, until finishing coarse adjustment.

10. device as claimed in claim 9, it is characterized in that, whether described demonstration contrast condition judgment module also is used to judge the difference of average gray value in liquid crystal module liquid crystal display critical boundary the right and left to be adjusted zone less than default threshold limit value, and whether the difference of average gray value of judging liquid crystal module liquid crystal display critical boundary the right and left to be adjusted zone is less than default threshold limit value; The described critical boundary that described liquid crystal module liquid crystal display critical boundary to be adjusted is a standard liquid crystal module liquid crystal display;

When described demonstration contrast adjusting module is judged as needs adjustment contrast in described demonstration contrast condition judgment module, the demonstration contrast of liquid crystal module liquid crystal display to be adjusted is transferred in examination up or down, and according to the difference of the average gray value in liquid crystal module liquid crystal display critical boundary the right and left to be adjusted zone after the adjustment and the demonstration contrast of the relation continuation adjustment liquid crystal module liquid crystal display to be adjusted of the threshold limit value of presetting, until finishing fine tuning.

11. adjust the system that liquid crystal display shows contrast for one kind, it is characterized in that described system adopts the device that shows contrast as each described adjustment liquid crystal display of claim 6 to 10, described device places a main frame, and described system also comprises:

Anchor clamps, be built-in with burning module, single-chip microcomputer and with the communication module of described main-machine communication, comprise the base and the support of fixed standard liquid crystal module or liquid crystal module to be adjusted;

Image collecting device is fixed on the support of described anchor clamps, and the position of the liquid crystal module on the described base is used to gather the display image of standard liquid crystal module or liquid crystal module to be adjusted and is sent to described main frame;

Described main frame sends to described single-chip microcomputer and adjusts the order that liquid crystal module liquid crystal display to be adjusted shows contrast, and after the examination accent is finished, send the burning order to described single-chip microcomputer, the described burning module of described Single-chip Controlling advances liquid crystal module to be adjusted with the current state burning.

Images