CN110853590B - Method for adjusting display device with double-panel - Google Patents

Method for adjusting display device with double-panel Download PDF

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CN110853590B
CN110853590B CN201911068548.9A CN201911068548A CN110853590B CN 110853590 B CN110853590 B CN 110853590B CN 201911068548 A CN201911068548 A CN 201911068548A CN 110853590 B CN110853590 B CN 110853590B
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panel
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CN110853590A (en
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陈立杰
陈建文
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AU Optronics Corp
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

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  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Processing Of Color Television Signals (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The invention discloses an adjusting method of a display device with a double-panel. The display device includes a first panel and a second panel. The adjusting method comprises the following steps: adjusting a first input signal of the first panel according to the intersection points of the first gray scale, the second gray scale and the third gray scale of the front-view gamma curve and the side-view gamma curve, thereby obtaining an adjusted signal; and setting a second input signal of the second panel based on the adjusted signal.

Description

Method for adjusting display device with double-panel
Technical Field
The present invention relates to a method for adjusting a display device, and more particularly, to a method for adjusting a display device having a dual panel.
Background
The conventional display with a single liquid crystal panel has reduced contrast due to light leakage, and thus a display with two liquid crystal panels is proposed to solve the problem of light leakage and further improve the contrast. The display with two liquid crystal panels may have a white washout condition in a side view. The problem of developing a wash-white color shift in a side view situation can be effectively improved by adding a wash-white film (wash out film). Although the whitening film can improve the side-view whitening color shift, the transmittance and contrast are reduced besides the overall cost is increased.
Disclosure of Invention
The invention provides an adjusting method of a display device with a double-panel, which can effectively solve the problem of side-view white washing color cast.
The invention relates to an adjusting method of a display device with double panels, wherein the display device comprises a first panel and a second panel, and the adjusting method comprises the following steps: adjusting a first input signal of the first panel according to the intersection points of the first gray scale, the second gray scale and the third gray scale of the front-view gamma curve and the side-view gamma curve, thereby obtaining an adjusted signal; and setting a second input signal of the second panel based on the adjusted signal.
In an embodiment of the invention, the step of adjusting the first input signal of the first panel according to the intersection of the front-view gamma curve and the side-view gamma curve at the first gray scale, the second gray scale and the third gray scale, thereby obtaining the adjusted signal includes: obtaining a target gray scale value according to the intersection points of the first gray scale, the second gray scale and the third gray scale of the front-view gamma curve and the side-view gamma curve; setting an adjustment parameter by using the target gray-scale value and the first input signal; and multiplying the three-color gray scale value of the first input signal by the adjusting parameter, thereby obtaining an adjusted signal.
In an embodiment of the present invention, the step of obtaining the target gray scale value includes: and averaging the values of the front-view gamma curve and the side-view gamma curve at the respective intersection points of the first gray scale, the second gray scale and the third gray scale, thereby obtaining a target gray scale value. The step of setting the adjustment parameter by using the target gray-scale value and the first input signal includes: the minimum value is found out from the three-color gray scale values of the first input signal, and the target gray scale value is divided by the minimum value, thereby obtaining the adjustment parameter.
In an embodiment of the present invention, after setting the adjustment parameter, the method further includes: if the value obtained by multiplying the maximum value of the three-color gray-scale values of the first input signal by the adjusting parameter is larger than 255, the adjusting parameter is reset. The step of resetting the adjustment parameters comprises: a value obtained by dividing 255 by the maximum value among the three color gray-scale values of the first input signal is set as the adjustment parameter.
In an embodiment of the present invention, after setting the adjustment parameter, the method further includes: resetting an adjustment parameter based on the saturation level and the brightness level, thereby dropping the second input signal of the second panel by the reset adjustment parameter.
In an embodiment of the invention, the step of setting the second input signal of the second panel based on the adjusted signal includes: calculating a target brightness value based on the ideal brightness value of the first input signal and the ideal brightness reduction ratio corresponding to the second panel; and setting a second input signal of the second panel based on the target brightness value and the adjusted signal.
In an embodiment of the present invention, the calculating the target luminance value based on the ideal luminance value of the first input signal and the ideal luminance reduction ratio corresponding to the second panel includes: inquiring a first ideal brightness corresponding table of a first panel based on a first input signal so as to add three brightness values corresponding to three-color gray-scale values of the first input signal to obtain an ideal brightness value; inquiring a second ideal brightness corresponding table of the second panel based on the maximum value of three-color gray scale values of the first input signal to obtain the gray scale of which the maximum value corresponds to the second panel, and inquiring a gamma table of the second panel based on the obtained gray scale of the second panel to obtain an ideal brightness reduction ratio; and multiplying the ideal luminance value by the ideal luminance decrease ratio to obtain a target luminance value.
In an embodiment of the invention, the step of setting the second input signal of the second panel based on the target brightness value and the adjusted signal includes: inquiring a first ideal brightness corresponding table of a first panel based on a first input signal to obtain a brightness value of an adjusted signal; dividing the target brightness value by the brightness value to obtain a brightness reduction ratio of the second panel; and setting the second input signal by looking up the gamma table of the second panel at the brightness reduction ratio.
Based on the above, the present invention adjusts the input signal of the first panel to the region with smaller front-side view variation, and then adjusts the brightness of the input signal of the second panel to improve the problem of side-view white shift.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a flowchart illustrating an adjusting method of a display device having a dual panel according to an embodiment of the present invention.
Fig. 2A is a schematic diagram of an elevational gamma curve according to an embodiment of the invention.
FIG. 2B is a schematic diagram of a side-view gamma curve according to an embodiment of the invention.
FIG. 3A is a schematic diagram of a front-view gamma curve and a side-view gamma curve at a first gray scale according to an embodiment of the invention.
FIG. 3B is a schematic diagram of a front-view gamma curve and a side-view gamma curve at a second gray level according to an embodiment of the invention.
FIG. 3C is a schematic diagram of a front-view gamma curve and a side-view gamma curve at a third gray level according to an embodiment of the invention.
Fig. 4 is a flowchart illustrating an adjustment method of a display device having a dual panel according to another embodiment of the present invention.
FIG. 5 is a graph of gray scale and luminance obtained from a first ideal luminance mapping table of a first panel according to an embodiment of the present invention.
FIG. 6 is a diagram of saturation and Ratio obtained based on a saturation table according to an embodiment of the present inventionkA graph of the relationship (c).
FIG. 7 is a luminance and Ratio obtained based on a luminance table according to an embodiment of the inventionk' in the figure.
Wherein, the reference numbers:
s105 to S110: each step of the adjusting method of the display device with the double-sided board according to an embodiment of the present invention
S405 to S440: the steps of the adjusting method of the display device with two panels according to another embodiment of the present invention
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
In general, although the addition of a wash-out film (wash out film) to a display of a dual liquid crystal panel can effectively improve the problem of color shift in a side view, the transmittance and contrast are reduced. Therefore, the invention provides an adjusting method of a display device with a double-panel, which can effectively improve the problem of side-view white washing color cast by adjusting signals of a first panel and a second panel. In order to make the content of the present invention more clear, the following specific examples are given as examples according to which the present invention can be actually carried out.
Fig. 1 is a flowchart illustrating an adjusting method of a display device having a dual panel according to an embodiment of the present invention. In this embodiment, the display device has a first panel and a second panel. The first panel is, for example, a front cell (front cell), and the second panel is, for example, a back cell (back cell). In step S105, the first input signal of the first panel is adjusted according to the intersection of the front-view gamma curve and the side-view gamma curve at the first gray scale, the second gray scale and the third gray scale, so as to obtain an adjusted signal.
Fig. 2A is a schematic diagram of an elevational gamma curve according to an embodiment of the invention. FIG. 2B is a schematic diagram of a side-view gamma curve according to an embodiment of the invention. Fig. 2A shows a gamma curve obtained by measuring the luminance of the display device using an optical instrument in a front view (0 °). Fig. 2B shows a gamma curve obtained by measuring the luminance of the display device with an optical instrument in a side view (e.g., 45 °). As can be seen from fig. 2A and 2B, the washout color shift is more severe in the low and medium gray levels in the side view.
In this embodiment, for example, the signal (the first input signal) of the first panel is adjusted to a high gray level, and the gray level of the signal (the second input signal) of the second panel is decreased, so that the brightness of the display device is the same before and after the adjustment. In order to adjust the first input signal to a higher gray scale in an equal proportion manner, an adjustment parameter k can be obtained from the front-view gamma curve and the side-view gamma curve, and the first input signal is adjusted by using the adjustment parameter k. For example, adjust the first input signal (R) of the first panelin,Gin,Bin) Is (R)out,Gout,Bout)＝k×(Rin,Gin,Bin). In addition, the signal of the first panel (the first input signal) may be adjusted to a low gray scale, and the gray scale of the signal of the second panel (the second input signal) may be adjusted to a high gray scale.
Next, in step S105, a second input signal of the second panel is set based on the adjusted signal. That is, after the first input signal of the first panel is determined, the adjustment of the second panel is matched, so that the overall brightness Y of the display device after adjustment is achievedAdjustEqual to the overall brightness Y before adjustmentOrigin。
Further description is given below by way of example. FIG. 3A is a schematic diagram of a front-view gamma curve and a side-view gamma curve at a first gray scale according to an embodiment of the invention. FIG. 3B is a schematic diagram of a front-view gamma curve and a side-view gamma curve at a second gray level according to an embodiment of the invention. FIG. 3C is a schematic diagram of a front-view gamma curve and a side-view gamma curve at a third gray level according to an embodiment of the invention.
In the present embodiment, the adjustment parameter k can be obtained from the front-view gamma curve and the side-view gamma curve. Specifically, the target gray-scale value is obtained at each intersection of the first gray-scale, the second gray-scale and the third gray-scale according to the front-view gamma curve and the side-view gamma curve. The first gray scale, the second gray scale and the third gray scale are red, green and blue, respectively. Then, the target gray level value and the first input signal are used to set the adjustment parameter. And multiplying the three-color gray scale value of the first input signal by the adjusting parameter, thereby obtaining an adjusted signal. The following description will be made in detail with reference to an embodiment.
Fig. 4 is a flowchart illustrating an adjustment method of a display device having a dual panel according to another embodiment of the present invention. Referring to fig. 4, in step S405, an adjustment parameter k is calculated. Here, the cross point will be described by taking fig. 3A to 3C as an example. As can be seen from FIGS. 3A-3C, the front-view gamma curve and the side-view gamma curve are located at the respective intersections of the first gray scale, the second gray scale and the third gray scale (hereinafter referred to as R respectively)cross、Gcross、Bcross) 238, 208, 229, respectively. And averaging the values of the front-view gamma curve and the side-view gamma curve at the respective intersection points of the first gray scale, the second gray scale and the third gray scale, thereby obtaining a target gray scale value. Namely:
GrayCross＝Avg(Rcross,Gcross,Bcross)；
wherein, GrayCrossIs the target gray scale value.
At a cross point Rcross、Gcross、 B cross238, 208, 229, respectively, GrayCross＝225。
Empirically, the most serious factor affecting the white bias is the minimum of the three color gray scale values of the first input signal of the first panel. Accordingly, the three color gray scale values (R) from the first input signalin,Gin,Bin) Finding out the minimum value, dividing the target gray level value by the minimum valueThis obtains the tuning parameters. Namely:
k＝GrayCross/Min(Rin,Gin,Bin)；
wherein k is an adjustment parameter; min (R)in,Gin,Bin) Is the three-color gray scale value (R) of the first input signalin,Gin,Bin) Minimum value of (1).
Then, in step S410, it is determined whether a value obtained by multiplying the maximum value of the three color gray scale values of the first input signal by the adjustment parameter is greater than 255. Namely Max (R)in,Gin,Bin) Whether xk is greater than 255. Provided that Max (R)in,Gin,Bin) And k is less than or equal to 255, k is not adjusted as shown in step S415.
Provided that Max (R)in,Gin,Bin) If x k is greater than 255, in step S420, a value obtained by dividing 255 by the maximum value of the three color gray-scale values of the first input signal is set as an adjustment parameter, i.e., k is readjusted as follows:
k＝255/Max(Rin,Gin,Bin)。
with a first input signal (R)in,Gin,Bin) Is (194,150,130), and GrayCrossFor 225, k is 225/130 ≈ 1.73. And Max (R)in,Gin,Bin) Is 194. Accordingly, 194 × 1.73 would be greater than 255. Therefore, in this example, k is set to 255/194 ≈ 1.31.
After obtaining the adjustment parameter k, the adjustment parameter is further reset according to the saturation table and the brightness table, so as to limit the gain under the conditions of high and low saturation and limit the gain under the condition of low gray scale.
In step S425, the adjustment parameters are reset based on the saturation table. A saturation is calculated based on a first input signal, and then a saturation table is queried to obtain a first proportional value (Ratio) corresponding to the saturationk) K is limited to obtain k'.
Wherein k' ═ k + (1-k) × Ratiok。
The saturation is calculated as follows:
S＝[Max(Rin,Gin,Bin)-Min(Rin,Gin,Bin)]/Max(Rin,Gin,Bin)；
wherein S is saturation.
Receiving the above example as a first input signal (R)in,Gin,Bin) For (194,150,130), S ═ 194 ≈ 130)/194 ≈ 0.33. Then, the relation graph shown in FIG. 6 is queried with the saturation of 0.33, and the Ratio can be obtainedk. FIG. 6 is a diagram of saturation and Ratio obtained based on a saturation table according to an embodiment of the present inventionkA graph of the relationship (c). Based on fig. 6, a Ratio corresponding to a saturation of 0.33 can be obtainedkIs 0. And k' is known by calculation.
Thereafter, in step S430, the adjustment parameters are reset based on the brightness table. The brightness is calculated based on the first input signal, and then the brightness table is inquired to obtain a second Ratio value (Ratio) corresponding to the brightnessk') to limit k ', to obtain k '.
Wherein k ″ + (1-k') × Ratiok’。
The lightness is calculated as follows:
V＝Max(Rin,Gin,Bin)/255；
wherein V is lightness.
Receiving the above example as a first input signal (R)in,Gin,Bin) For (194,150,130), V ═ 194/255 ≈ 0.76. Then, the relationship diagram shown in FIG. 7 is queried with the lightness of 0.76 to obtain the Ratiok'. FIG. 7 is a luminance and Ratio obtained based on a luminance table according to an embodiment of the inventionk' in the figure. Based on FIG. 7, a Ratio corresponding to lightness 0.76 can be obtainedk' is 0. And k "is known by calculation.
Accordingly, (R)out,Gout,Bout)＝k”×(Rin,Gin,Bin)＝1.31×(194,150,130)＝(255,197,170)。
Thereafter, in step S435, a target luminance value is calculated. Here, the target luminance value is calculated based on the ideal luminance value of the first input signal and the ideal luminance decrease ratio corresponding to the second panel. Specifically, a first ideal brightness mapping table of the first panel is queried based on the first input signal, so that an ideal brightness value is obtained after three brightness values corresponding to three-color gray-scale values of the first input signal are added. Then, based on the maximum value in the three-color gray scale values of the first input signal, the second ideal brightness corresponding table of the second panel is inquired to obtain the gray scale of the second panel corresponding to the maximum value, and the gamma table of the second panel is inquired based on the obtained gray scale of the second panel to obtain the ideal brightness reduction ratio. Then, the ideal luminance value is multiplied by the ideal luminance decreasing ratio to obtain a target luminance value.
FIG. 5 is a graph of gray scale and luminance obtained from a first ideal luminance mapping table of a first panel according to an embodiment of the present invention. In this embodiment, the gray scale of the second panel is set to 255, and the gray scale of the first panel is set from 0 to 255 for red, green and blue, respectively, so as to measure the luminance values (in nits) respectively.
Based on a first input signal (R)in,Gin,Bin) To (194,150,130), a query is made in the relationship diagram shown in fig. 5, and the luminance value corresponding to 194 for red, 150 for green, and 130 for blue are added to obtain the desired luminance value. Here, the ideal luminance value is, for example, 189.9 nits.
The gamma table of the second panel measures the brightness (assuming that the brightness is the brightest in the un-attenuated state) when the gray scale of the first panel is fixed to 255 and the gray scale of the second panel is set to 255, and determines how much the brightness is attenuated when the brightness is reduced by one gray scale after the brightness is taken as the standard brightness. For example, the luminance obtained when the gray scale of the first panel is 255 and the gray scale of the second panel is 254 is compared with the standard luminance, the ideal luminance decrease ratio is determined, and then the ideal luminance decrease ratio is filled in the field corresponding to 254. Then, measurements were made for the gray scale settings 253, 252, … …,1, 0 of the second panel, respectively, to obtain the following table 1.
Table 1 (Gamma watch)
Figure BDA0002260182940000071
And a second ideal brightness correspondence table of the second panel is obtained by comparing the actually measured curve with the ideal gamma curve. Under the condition that the gray scale of the second panel is fixed to a preset gray scale (for example, 255), the gray scale of the first panel is set from 0 to 255 respectively, and after the gray scale of the first panel is set, the brightness value is measured, and the actual measurement curve is obtained by a plurality of brightness values corresponding to the plurality of gray scales 0 to 255 respectively.
Then, one of the gray scales is taken out one by one from 0 to 255 as a designated gray scale, the brightness value corresponding to the designated gray scale is taken out from the actual measurement curve, and the ideal brightness value corresponding to the designated gray scale is taken out from the ideal gamma curve. Then, a luminance ratio is obtained based on the obtained luminance value and the luminance ideal value. Then, the corresponding gray scale of the second panel corresponding to the brightness reduction ratio corresponding to the brightness ratio is extracted from the gamma table, and the designated gray scale of the first panel and the corresponding gray scale of the second panel are recorded into a second ideal brightness corresponding table (as shown in table 2).
Assuming that the designated gray scale is 13, the luminance value Y corresponding to the designated gray scale 13 is taken out from the actual measurement curve and the ideal luminance value Y' corresponding to the designated gray scale 13 is taken out from the ideal gamma curve. Next, a luminance ratio (═ Y '/Y) between the luminance value Y and the ideal luminance value Y' is calculated. Assuming that the brightness ratio is 2.7%, the corresponding gray scale (gray scale 3) of the second panel corresponding to the brightness reduction ratio of 2.7% is found from the gamma table shown in table 1. Then, in the second ideal luminance mapping table (as shown in table 2), 3 is filled in the gray level field of the second panel corresponding to the gray level 13 (designated gray level) of the first panel.
And in the same way, one of the gray scales from 0 to 255 is taken out one by one to be used as a designated gray scale, so that the designated gray scale of the first panel and the corresponding gray scale of the second panel are recorded into the second ideal brightness corresponding table.
Table 2 (second ideal brightness corresponding table)
Figure BDA0002260182940000081
With a first input signal (R)in,Gin,Bin) For (194,150,130), the maximum value 194 is used as the gray scale of the first panel to query the second brightness mapping table, and the desired gray scale of the second panel is 227. Thereafter, the gamma table is looked up based on the gray scale of the second panel being 227 to obtain an ideal luminance reduction ratio of 87%.
Then, the ideal brightness value is multiplied by the ideal brightness reduction ratio to obtain the target brightness value. That is, the target luminance value Y is 189.9 × 87% ═ 166.5 nits.
Returning to fig. 4, then, in step S440, the second input signal of the second panel is set based on the target brightness value and the adjusted signal. The first ideal brightness corresponding table of the first panel is inquired based on the first input signal to obtain the brightness value of the adjusted signal. And dividing the target brightness value by the brightness value to obtain the brightness reduction ratio of the second panel. The second input signal is set by looking up the gamma table of the second panel at the brightness reduction ratio.
Based on (R)out,Gout,Bout) To (255,197,170), a query is made in the relationship diagram shown in FIG. 5, and the luminance value corresponding to 255 for red, the luminance value corresponding to 197 for green, and the luminance value corresponding to 170 for blue are added to obtain the adjusted luminance value 289.84nits for the signal. Then, the target luminance value 166.5nits is divided by the luminance value 289.84nits of the adjusted signal to obtain a luminance reduction ratio. Then, the gamma table (table 1) of the second panel is looked up according to the brightness reduction ratio to obtain the corresponding gray scale of the second panel. Accordingly, the gray scale obtained from the gamma table is used to set the second input signal of the second panel.
Here, the storage device in the display apparatus stores, for example, a front-view gamma curve, a side-view gamma curve, a saturation table, a brightness table, a first ideal brightness correspondence table of the first panel, a second ideal brightness correspondence table of the second panel, and a gamma table of the second panel. After the display device receives a signal (a first input signal) to be input to the first panel, the controller built in the display device can dynamically adjust the input signals of the first panel and the second panel according to the above-mentioned embodiment.
In summary, according to the above embodiments, the input signal of the first panel is adjusted to the section with small front-side view variation, and then the brightness of the input signal of the second panel is adjusted. The display device does not need to be provided with a white washing film, so that the cost is saved, and the problem of side-view white washing color cast can be effectively improved.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims (8)

1. An adjusting method of a display device with two panels, the display device comprising a first panel and a second panel, the adjusting method comprising:
adjusting a first input signal of the first panel according to the intersection points of a front view gamma curve and a side view gamma curve at a first gray scale, a second gray scale and a third gray scale, thereby obtaining an adjusted signal; and
setting a second input signal of the second panel based on the adjusted signal.
2. The method of claim 1, wherein the step of adjusting the first input signal of the first panel according to the intersection of the front-view gamma curve and the side-view gamma curve at the first gray scale, the second gray scale and the third gray scale respectively, thereby obtaining the adjusted signal comprises:
obtaining a target gray scale value according to the intersection points of the front-view gamma curve and the side-view gamma curve at the first gray scale, the second gray scale and the third gray scale;
setting an adjustment parameter by using the target gray level value and the first input signal; and
multiplying the three-color gray scale value of the first input signal by the adjusting parameter, thereby obtaining the adjusted signal.
3. The method of claim 2, wherein the obtaining the target gray level value comprises:
averaging the values of the front-view gamma curve and the side-view gamma curve at the respective intersections of the first gray scale, the second gray scale and the third gray scale, thereby obtaining the target gray scale value;
wherein the step of setting the adjustment parameter by using the target gray-scale value and the first input signal comprises:
finding out a minimum value from the three-color gray-scale values of the first input signal, and dividing the target gray-scale value by the minimum value to obtain the adjustment parameter.
4. The method for adjusting a display device having two panels as claimed in claim 3, further comprising, after setting the adjustment parameters:
if a value obtained by multiplying a maximum value of the three color gray-scale values of the first input signal by the adjustment parameter is larger than 255, resetting the adjustment parameter includes:
setting a value obtained by dividing 255 by the maximum value among the three color gray-scale values of the first input signal as the adjustment parameter;
if a value obtained by multiplying a maximum value of the three color gray-scale values of the first input signal by the adjustment parameter is less than or equal to 255, the adjustment parameter is not adjusted.
5. The method for adjusting a display device having two panels as claimed in claim 2, further comprising, after setting the adjustment parameters:
resetting the adjustment parameter based on a saturation level and a brightness level, thereby adjusting the second input signal of the second panel with the reset adjustment parameter.
6. The method of claim 1, wherein the step of setting the second input signal of the second panel based on the adjusted signal comprises:
calculating a target brightness value based on an ideal brightness value of the first input signal and an ideal brightness reduction ratio corresponding to the second panel; and
setting the second input signal of the second panel based on the target brightness value and the adjusted signal.
7. The method as claimed in claim 6, wherein the step of calculating the target brightness value based on the ideal brightness value of the first input signal and the ideal brightness reduction ratio corresponding to the second panel comprises:
inquiring a first ideal brightness corresponding table of the first panel based on the first input signal so as to add three brightness values corresponding to three-color gray-scale values of the first input signal to obtain an ideal brightness value;
inquiring a second ideal brightness corresponding table of the second panel based on a maximum value in three-color gray scale values of the first input signal to obtain a gray scale of the second panel corresponding to the maximum value, and inquiring a gamma table of the second panel based on the obtained gray scale of the second panel to obtain the ideal brightness reduction ratio; and
multiplying the ideal brightness value by the ideal brightness reduction ratio to obtain the target brightness value.
8. The method as claimed in claim 6, wherein the step of setting the second input signal of the second panel based on the target brightness value and the adjusted signal comprises:
inquiring a first ideal brightness corresponding table of the first panel based on the first input signal to obtain a brightness value of the adjusted signal;
dividing the target brightness value by the brightness value to obtain a brightness reduction ratio of the second panel; and
the second input signal is set by looking up a gamma table of the second panel according to the brightness reduction ratio.
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