JP2000172218A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal display device capable of performing an optimum display regardless of the level of an input video signal in the liquid crystal display device displaying input picture data. SOLUTION: This device is constituted so that a signal level detecting part 1 detects the mean signal level, the maximum signal level and the minimum signal level of a luminance signal which is to be inputted based on detection range information and a gain control part 2 produces gains and gain offsets with respect to respective signals of R, G, B in accordance with the mean signal level, the maximum signal level and the minimum signal level outputted from the signal level detecting part 1 and an offset control part 3 produces offsets with respect to the respective signal of R, G, B according to the mean signal level, the maximum signal level and the minimum signal level outputted from the signal level detecting part 1 and the gains and the gain offsets outputted from the gain control part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of improving the visibility and displaying an image in an optimum state by changing the set values relating to a contrast correction circuit and an offset correction circuit with respect to input image data as an input video signal. The present invention relates to a liquid crystal display device capable of performing control adapted to various levels.

[0002]

2. Description of the Related Art In a processing section of an input video signal in a conventional liquid crystal display device, R, R
G and B signals are subjected to contrast correction, offset correction, gamma correction related to the liquid crystal panel, inversion amplification, and the like, and the amplified output signal is supplied to the liquid crystal panel. The visibility on the liquid crystal panel is greatly affected by the correction contents in the processing section of the input video signal. A technique for correcting an input video signal for the purpose of improving visibility is described in JP-A-5-183921. The technique described in Japanese Patent Application Laid-Open No. 5-183921 is a method of detecting a luminance level of an input video signal and correcting a set value relating to an offset circuit and a gain amplifier circuit.

Next, the conventional liquid crystal display device for improving visibility will be described with reference to the drawings.
FIG. 21 is a block diagram showing a configuration of a conventional liquid crystal display device. In FIG. 21, a signal peak detection unit 71 outputs a maximum signal level and a minimum signal level of a luminance signal. The offset setting section 72 sets an offset such that the minimum signal level matches the black level of the liquid crystal panel.
The gain setting unit 73 sets the gain based on the maximum signal level and the minimum signal level so that the maximum signal level becomes the white level of the liquid crystal panel. The offset correction circuit 5 performs offset control on the R, G, and B signals output from the decode circuit 6 based on the offset from the offset setting unit 72. The gain amplifying circuit 75 includes a gain setting unit 7
The gain amplifying process is performed on the R, G, and B signals output from the offset control circuit 5 with the gain from 3.

FIG. 22 shows a conceptual diagram of control for an input signal in FIG. In FIG. 22, the input signal V is
Since the minimum signal level is the same as the black level, no offset correction is performed. Since the maximum signal level after the offset correction is the same as the white level, no gain amplification is performed. Input signal W
Is shifted to the black level by offset correction because the minimum signal level is higher than the black level, and gain amplification is performed because the maximum signal level after offset correction is lower than the white level. For the input signal X, offset correction is not performed because the minimum signal level is the same as the black level, and gain amplification is performed because the maximum signal level after the offset correction is lower than the white level. In this way, the visibility can be improved by shifting the minimum signal level to the black level of the liquid crystal panel by offset correction and amplifying the gain so that the maximum signal level after offset correction matches the white level of the liquid crystal panel. It is possible.

[0005]

However, FIG.
In the configuration of the conventional liquid crystal display device shown in (1), when the gain cannot be increased due to noise amplification suppression, or when it is desired to provide a large gain such that the maximum signal level and the minimum signal level exceed the black level and the white level, However, there was a problem that the signal was shifted. FIG. 23 is an explanatory diagram showing the concept of control on input signals Y and Z in a conventional liquid crystal display device. As shown in FIG. 23, when the gain is small, a large gain is not given to the input signal Y, and the signal after gain amplification is shifted to the black level side. On the other hand, when the gain is large, the input signal Z is in a state where the white side is largely crushed by the large gain. Such a state has not been solved in the signal processing circuit of the conventional liquid crystal display device and has been a serious problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device capable of performing display in an optimum state irrespective of the level of an input video signal as an input signal.

[0007]

In order to achieve the above object, a liquid crystal display device according to the present invention comprises: a liquid crystal panel for displaying an image based on input image data having a luminance signal and a color difference signal; A signal level detector for detecting an average signal level, a maximum signal level, and a minimum signal level of an input luminance signal, and a signal having an average signal level, a maximum signal level, and a minimum signal level output from the signal level detector. A gain control unit that creates a gain and a gain offset for each of the R, G, and B signals, and an average signal level, a maximum signal level, and a minimum signal level output from the signal level detection unit. An offset for creating an offset for each of the R, G, and B signals in accordance with the gain and the gain offset output from the gain control unit. A control unit; a decoding circuit that creates R, G, and B signals from the input luminance signal and color difference signals; and a decoding circuit output from the decoding circuit according to the gain and gain offset output from the gain control unit. A contrast correction circuit for adjusting a contrast level of each of the R, G, and B signals, and R, G, and B signals output from the contrast correction circuit in response to the offset signal output from the offset control unit. An offset correction circuit for adjusting the offset level of R, G, and B output from the offset correction circuit, and a gamma correction for performing gamma correction according to the voltage-transmittance characteristic of the liquid crystal panel unit A polarity inverting amplifier circuit for performing AC driving and amplifying the signals of R, G, and B output from the gamma correction circuit; Serial; and a timing generating circuit for outputting a timing signal required for display to the circuit in the liquid crystal panel unit. According to the present invention configured as described above, it is possible to obtain a liquid crystal display device that can perform display on a liquid crystal panel unit in an optimal state regardless of the level of an input video signal.

According to another aspect of the invention, there is provided a liquid crystal display device.
A liquid crystal panel that displays an image based on input image data having R, G, and B signals; an average signal level, a maximum signal level, and a minimum signal level of the input R, G, and B signals based on detection range information; A signal level detector for detecting a signal level, and a gain and a gain for each of the R, G, and B signals according to the average signal level, the maximum signal level, and the minimum signal level output from the signal level detector. A gain control unit for creating an offset; and an average signal level, a maximum signal level, and a minimum signal level output from the signal level detection unit, and a gain and a gain offset output from the gain control unit. , G,
An offset control unit that creates an offset for each of the B signals; and a contrast correction circuit that adjusts the contrast level of each of the input R, G, and B signals according to the gain and the gain offset output from the gain control unit. An offset correction circuit that adjusts an offset level of each of the R, G, and B signals output from the contrast correction circuit according to an offset signal output from the offset control unit; A gamma correction circuit that performs gamma correction on each of the R, G, and B signals in accordance with the voltage-transmittance characteristic of the liquid crystal panel unit, and R, G, and B output from the gamma correction circuit.
A polarity inversion amplifier circuit for performing AC driving and signal amplification for each of the G and B signals, and a timing generation circuit for outputting a timing signal required for display to a circuit in the liquid crystal panel unit. According to the present invention configured as described above, it is possible to obtain a liquid crystal display device that can perform display on a liquid crystal panel unit in an optimal state regardless of the level of an input video signal.

According to another aspect of the invention, there is provided a liquid crystal display device for displaying an image based on input image data having a luminance signal and a color difference signal, and detecting the brightness of a surface portion or a periphery of the liquid crystal panel portion. An illuminance detector, based on the detection range information, an average signal level of the input luminance signal,
A signal level detector for detecting a maximum signal level and a minimum signal level; and R, G, and B signals according to the average signal level, the maximum signal level, and the minimum signal level output from the signal level detector. A gain control unit for creating a gain and a gain offset for the signal; an average signal level, a maximum signal level, and a minimum signal level output from the signal level detection unit; and a gain and gain offset output from the gain control unit. A illuminance offset control unit for creating a illuminance offset for each of the R, G, and B signals in accordance with the illuminance signal output from the illuminance detection unit;
A decoding circuit that creates each of the G and B signals; and a contrast level of each of the R, G, and B signals output from the decode circuit is adjusted according to the gain and the gain offset output from the gain control unit. A contrast correction circuit, and an offset correction circuit that adjusts an offset level of each of the R, G, and B signals output from the contrast correction circuit according to the illuminance offset signal output from the illuminance offset control unit. A gamma correction circuit for performing gamma correction on each of the R, G, and B signals output from the offset correction circuit in accordance with the voltage-transmittance characteristic of the liquid crystal panel unit, and an R signal output from the gamma correction circuit , G, and B signals, and a polarity inversion amplifier circuit for performing AC driving and signal amplification. ; And a timing generating circuit for outputting a timing signal necessary for. According to the present invention configured as described above, it is possible to obtain a liquid crystal display device that can perform display on a liquid crystal panel unit in an optimal state regardless of the level of an input video signal.

According to another aspect of the present invention, there is provided a liquid crystal display device for displaying an image based on input image data having a luminance signal and a color difference signal, and detecting brightness of a surface portion or a periphery of the liquid crystal panel portion. An illuminance detector, based on the detection range information, an average signal level of the input luminance signal,
A signal level detector for detecting a maximum signal level and a minimum signal level; and R, G, and B signals according to the average signal level, the maximum signal level, and the minimum signal level output from the signal level detector. A gain control unit that creates a gain offset and a gain for the signal; an average signal level, a maximum signal level, and a minimum signal level signal output from the signal level detection unit; and a gain and gain offset output from the gain control unit. A illuminance signal output from the illuminance detection unit, a illuminance correction value control unit for creating a illuminance correction gain and an illuminance correction offset for each of the R, G, and B signals; A decoding circuit for generating R, G, and B signals from a color difference signal; a gain offset output from the gain control unit; A contrast correction circuit that adjusts a contrast level of each of the R, G, and B signals output from the decoding circuit in accordance with the illuminance correction gain output from the positive value control unit; An offset correction circuit for adjusting an offset level of the R, G, and B signals output from the contrast correction circuit in accordance with the output contrast correction offset signal;
A gamma correction circuit that performs gamma correction on the R, G, and B signals output from the offset correction circuit in accordance with the voltage-transmittance characteristics of the liquid crystal panel unit; A polarity inversion amplifier circuit for performing AC driving and signal amplification for each of the G and B signals, and a timing generation circuit for outputting a timing signal required for display to a circuit in the liquid crystal panel unit. According to the present invention configured as described above, it is possible to control to obtain an output centered on the intermediate luminance level for any input signal, and to avoid white-side signal collapse when the offset amount increases. Alternatively, it is possible to improve the visibility of the liquid crystal panel in places with different illuminances, such as white-side signal expansion when the offset amount is reduced.

According to another aspect of the invention, there is provided a liquid crystal display device for displaying an image based on input image data having a luminance signal and a color difference signal, and an average signal level of the input luminance signal based on detection range information. , A signal level detector for detecting the maximum signal level and the minimum signal level, and R, R, and R in accordance with the average signal level, the maximum signal level, and the minimum signal level output from the signal level detector.
A gain control unit that creates a gain and a gain offset for each of the G and B signals; an average signal level, a maximum signal level, and a minimum signal level output from the signal level detection unit; and a signal output from the gain control unit. An offset control unit that creates an offset for each of the R, G, and B signals according to the gain and the gain offset, a detection range information for the signal level detection unit, and a gain and a gain offset output from the gain control unit. Accordingly, a linear change gain creating section for creating a linear change gain and a linear change gain offset for each of the R, G, and B signals, detection range information for the signal level detection section, and an offset output from the offset control section. A linear change to create a linear change offset for each of the R, G, and B signals Offset generating section, a decoding circuit for generating R, G, and B signals from the input luminance signal and color difference signal, and a linear change gain and a linear change gain offset output from the linear change gain generating section. A contrast correction circuit that adjusts the contrast levels of the R, G, and B signals output from the decode circuit; and the contrast correction circuit outputs the linear change offset signal output from the linear change offset generator. An offset correction circuit for adjusting the offset levels of the R, G, and B signals; and a gamma corresponding to the voltage-transmittance characteristic of the liquid crystal panel unit for each of the R, G, and B signals output from the offset correction circuit. A gamma correction circuit for performing correction, and R and R output from the gamma correction circuit.
A polarity inversion amplifier circuit for performing AC driving and signal amplification for each of the G and B signals, and a timing generation circuit for outputting a timing signal required for display to a circuit in the liquid crystal panel unit. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, while improving the visibility of a specific range, it becomes possible to moderate the image change in the boundary part outside a specific range.

According to another aspect of the invention, there is provided a liquid crystal display device for displaying an image based on input image data having a luminance signal and a color difference signal, and an average signal level of the input luminance signal based on detection range information. , A signal level detector for detecting a maximum signal level and a minimum signal level, and R, R,
A gain control unit that creates a gain and a gain offset for each of the G and B signals; an average signal level, a maximum signal level, and a minimum signal level output from the signal level detection unit; and a signal output from the gain control unit. An offset control unit that creates an offset for each of the R, G, and B signals in accordance with the gain and the gain offset, a detection range information for the signal level detection unit, and a gain and a gain offset output from the gain control unit. Accordingly, a curve change gain creating section for creating a curve change gain and a curve change gain offset for each of the R, G, and B signals, and the curve change gain creating section sets the change of the gain and the gain offset to a curve change. ROM for gain curve, and detection range information for the signal level detection unit. Depending on the offset output from the offset controller, R, G, and curves change the offset generating unit configured to generate a curve change offset for each of the signals for the B,
An offset curve RO for setting the change of the offset into a curve change in the curve change offset creating section.
M, a decoding circuit that creates R, G, and B signals from the input luminance signal and color difference signal, and a curve change gain and a curve change gain offset output from the curve change gain generator. A contrast correction circuit for adjusting a contrast level in each of the R, G, and B signals output from the decoding circuit; and an output from the contrast correction circuit according to a curve change offset signal output from the curve change offset control unit. An offset correction circuit that adjusts an offset level of each of the R, G, and B signals; A gamma correction circuit for performing gamma correction; AC driving and signal amplification for R, G, and B signals output from the gamma correction circuit; A polarity inverting amplifier circuit for performing comprises a timing generating circuit for outputting a timing signal required for display to the circuits in the liquid crystal panel unit. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, while improving the visibility of a specific range, it becomes possible to moderate the image change in the boundary part outside a specific range.

According to another aspect of the invention, there is provided a liquid crystal display device for displaying an image based on input image data having a luminance signal and a color difference signal, and a first part of the input luminance signal based on the first range information. A first range signal level detector for detecting a range average signal level, a first range maximum signal level, and a first range minimum signal level; a first range average signal level output from the first range signal level detector; A first range gain control unit that creates a first range gain and a first range gain offset for each of the R, G, and B signals in accordance with each of the one range maximum signal level and the first range minimum signal level; The first range average signal level, the first range maximum signal level, and the first range minimum signal level output from the first range signal level detection unit and the first range gain control unit output the respective signals. The first range offset control unit that creates the first range offset for each of the R, G, and B signals in accordance with the first range gain and the first range gain offset, and the second range information that is input based on the second range information. A second range signal level detector for detecting a second range average signal level, a second range maximum signal level, and a second range minimum signal level of the luminance signal; and a second range output from the second range signal level detector. According to the average signal level, the second range maximum signal level and the second range minimum signal level, R, G,
A second range gain control unit for creating a second range gain and a second range gain offset for each signal of B; a second range average signal level and a second range maximum signal output from the second range signal level detection unit A second range offset for each of the R, G, and B signals according to the level and second range minimum signal level signals and the second range gain and the second range gain offset output from the second range gain controller; A first range information for the first range signal level detection unit, a second range information for the second range signal level detection unit, and a first range gain output from the first range gain control unit. First range gain and first range
The two detection range gains and the two detection range gains for the R, G, and B signals according to the range gain offset and the second range gain and the second range gain offset output from the second range gain control unit. A two-detection-range-corresponding linear-change-gain creating unit for creating an offset;
First range information for the range signal level detector and the second range information;
Second range information for the range signal level detector and the first range information;
A first range offset output from the range offset control unit and a second range offset output from the second range offset control unit;
A two-detection-range-corresponding linear-change offset creating unit that creates a two-detection-range-corresponding offset for each of the R, G, and B signals in accordance with the range offset; A decoding circuit for generating each signal; and R, G, and R output from the decoding circuit according to the two detection range corresponding gain and the two detection range corresponding gain offset output from the two detection range corresponding linear change gain generation unit. A contrast correction circuit for adjusting the contrast level of each signal of B; and R, G, and R output by the contrast correction circuit in accordance with the offset signal corresponding to the two detection ranges output from the linear detection offset control unit corresponding to the two detection ranges. An offset correction circuit for adjusting the offset level of each signal of B, and R, G, B output from the offset correction circuit A gamma correction circuit for performing gamma correction for each signal in accordance with the voltage-transmittance characteristic of the liquid crystal panel unit; and AC driving and signal conversion for each of R, G, and B signals output from the gamma correction circuit. A polarity inverting amplifier circuit for performing amplification; and a timing generating circuit for outputting a timing signal necessary for display to a circuit in the liquid crystal panel unit. According to the present invention configured as described above, the first
In each of the detection range and the second detection range, the visibility is optimally improved, and the image change at the boundary of each detection range can be reduced.

Further, in the liquid crystal display device according to the present invention, the signal level detection section performs an averaging of input signals with respect to an arbitrary screen area based on detection range information and a filtering process for suppressing a high frequency range. The maximum value and the minimum value may be created. According to the present invention configured as described above, it is possible to control to obtain an output centered on the intermediate luminance level for any input signal, and to avoid white-side signal collapse when the offset amount increases. Alternatively, it is possible to improve the visibility of the liquid crystal panel in places with different illuminances, such as white-side signal expansion when the offset amount is reduced. Further, according to the present invention, it is possible to improve the visibility of a specific range and reduce an image change at a boundary portion outside the specific range.

Further, in the liquid crystal display device according to the present invention, the first
The range signal level detection unit calculates the maximum value and the minimum value obtained by performing the averaging of the input signal and the filtering process for suppressing the high frequency range in an arbitrary screen area in the center of the screen based on the first range information. In addition to the creation, the second range signal level detection unit performs an averaging of input signals and a filtering process for suppressing a high frequency band in an arbitrary screen area around the screen based on the second range information. The maximum value and the minimum value may be created. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, in each of a 1st detection range and a 2nd detection range, optimal visibility improvement is performed and the image change of each detection range boundary part can be eased. Become.

Also, in the liquid crystal display device according to the present invention, the gain control section may include a gain offset corresponding to an average signal level output from the signal level detection section, and a maximum signal level output from the signal level detection section. It may be configured to output a gain according to the difference data between the signal and the minimum signal level. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, it becomes possible to control to obtain the output which aimed at the improvement of visibility centering on an intermediate luminance level about any input signal, It is possible to alleviate an image change in a portion.

Further, in the liquid crystal display device according to the present invention, the first
A range gain control unit configured to determine a first range gain offset corresponding to the first range average signal level output from the first range signal level detection unit and a first range maximum offset output from the first range signal level detection unit; A first range gain corresponding to difference data between the signal level and the first range minimum signal level is output, and the second range gain control unit outputs the second range average signal output from the second range signal level detection unit. A second range gain offset corresponding to the level and a second range gain corresponding to difference data between the second range maximum signal level and the second range minimum signal level output from the second range signal level detection unit are output. It may be configured as follows. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, in each of a 1st detection range and a 2nd detection range, optimal visibility improvement is performed and the image change of each detection range boundary part can be eased. Become.

Further, in the liquid crystal display device according to the present invention, the offset control section includes a maximum signal level and a minimum signal level output from the signal level detection section, a gain offset and a gain output from the gain control section. An offset is set so that the maximum signal level and the minimum signal level after the gain calculation process obtained by the above are arranged at equal positions around the intermediate signal level, and the average signal level output from the signal level detection unit is The offset may be shifted accordingly.
ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, it becomes possible to control to obtain the output which aimed at the improvement of visibility centering on an intermediate luminance level about any input signal, It is possible to alleviate an image change in a portion.

Further, in the liquid crystal display device of the present invention, the illuminance offset control section includes a maximum signal level and a minimum signal level output from the signal level detection section;
An offset is set such that the maximum signal level and the minimum signal level after the gain calculation processing obtained by the gain offset and the gain output from the gain control unit are arranged at equal positions around the intermediate signal level, and The offset may be shifted according to the illuminance output from the illuminance detection unit and the average signal level output from the signal level detection unit. According to the present invention configured as described above, it is possible to control to obtain an output centered on the intermediate luminance level for any input signal, and to improve the visibility of the liquid crystal panel in a place with different illuminance. It becomes possible to plan.

Further, in the liquid crystal display device according to the present invention, the illuminance correction value control section includes a maximum signal level and a minimum signal level output from the signal level detection section, and a gain offset output from the gain control section. The maximum signal level and the minimum signal level after the gain calculation processing obtained by and the gain are set to an offset such that they are arranged at equal positions around the intermediate signal level, and the illuminance output from the illuminance detection unit, And shifting the offset according to the average signal level output from the signal level detection unit, and additionally correcting the value output from the gain control unit according to the shift amount by suppressing or expanding the gain. You may comprise so that it may output as a gain. According to the present invention configured as described above, it is possible to control to obtain an output centered on the intermediate luminance level for any input signal, and to avoid white-side signal collapse when the offset amount increases. Alternatively, it is possible to improve the visibility of the liquid crystal panel in places with different illuminances, such as white-side signal expansion when the offset amount is reduced.

Further, in the liquid crystal display device according to the present invention, in the linear variation gain creating section, a predetermined width is formed at a boundary between the detection range and the detection range for the signal level detection section, and the detection range except the predetermined width is formed. Outputs the gain offset output from the gain control unit as a linear change gain offset, and outputs a predetermined gain offset set outside the detection range as a linear change gain offset outside the detection range excluding the predetermined width. In the range of the predetermined width, a value obtained by linearly changing between the gain offset output from the gain control unit and the predetermined gain offset set outside the detection range is output as a linear change gain offset. In the detection range excluding the predetermined width, the gain output from the gain control unit is output as a linear change gain. Outside the detection range excluding the predetermined width, a predetermined gain set for the outside of the detection range is output as a linear change gain, and the gain output from the gain control unit is outside the detection range in the predetermined width range. May be configured to output, as a linear change gain, a value obtained by linearly changing a value between the predetermined gain and the predetermined gain. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, while improving the visibility of a specific range, it becomes possible to moderate the image change in the boundary part outside a specific range.

Further, in the liquid crystal display device according to the present invention, in the linear variation offset creating section, a predetermined width is formed at a boundary between the detection range for the signal level detection section and the detection range, and the detection range excluding the predetermined width is formed. Outputs an offset output from the offset control unit as a linear change offset, and outputs a predetermined offset set outside the detection range as a linear change offset outside the detection range except for the predetermined width, and outputs the predetermined width. In the range, a value obtained by linearly changing the offset between the offset output from the offset control unit and a predetermined offset set outside the detection range may be output as a linear change offset. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, while improving the visibility of a specific range, it becomes possible to moderate the image change in the boundary part outside a specific range.

Further, in the liquid crystal display device according to the present invention, in the curve change gain creating section, a predetermined width is formed at a boundary between the detection range and the detection range with respect to the signal level detection section, and the detection range excluding the predetermined width is formed. Then, the gain offset output from the gain control unit is output as a curve change gain offset, and a predetermined gain offset set outside the detection range except for the predetermined width is set as a curve change gain offset. In the range of the predetermined width, a value obtained by changing a curve between a gain offset output from the gain control unit and a predetermined gain offset set outside the detection range using a gain curve ROM. Is output as a curve change gain offset, and in the detection range excluding the predetermined width, the gain output from the gain control unit is output. Output as a curve change gain, outside the detection range excluding the predetermined width, output a predetermined gain set for the outside of the detection range as a curve change gain, and output from the gain control unit in the predetermined width range. A configuration may be adopted in which a value obtained by changing a gain between a gain and a predetermined gain set outside the detection range in a curve using a gain curve ROM is output as a curve change gain. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, while improving the visibility of a specific range, it becomes possible to moderate the image change in the boundary part outside a specific range.

Further, in the liquid crystal display device according to the present invention, the curve change offset creating section has a predetermined range formed at a boundary between the detection range for the signal level detection section and the detection range, and a detection range excluding the predetermined width. Outputs the offset output from the offset control unit as a curve change offset, and outputs a predetermined offset set outside the detection range as a curve change offset outside the detection range excluding the predetermined width; In the range, a value obtained by changing a curve between the offset output from the offset control unit and a predetermined offset set outside the detection range using an offset curve ROM is output as a curve change offset. May be configured. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, while improving the visibility of a specific range, it becomes possible to moderate the image change in the boundary part outside a specific range.

Further, in the liquid crystal display device according to the present invention, the first range offset control section includes a first range maximum signal level and a first range minimum signal level output from the first range signal level detection section; The maximum signal level and the minimum signal level after the gain calculation processing obtained by the first range gain offset and the first range gain output from the first range gain control unit are arranged at equal positions around the intermediate signal level. Setting the offset so as to output a value obtained by shifting the offset according to the first range average signal level output from the first range signal level detector as a first range offset; A control unit configured to output a second range maximum signal level and a second range minimum signal level output from the second range signal level detection unit; The maximum signal level and the minimum signal level after gain calculation processing obtained from the second range gain offset and the second range gain output from the second range gain control unit are arranged at equal positions around the intermediate signal level. And the second
A value obtained by shifting the offset according to the second range average signal level output from the range signal level detection unit is used as a second range average signal level.
You may comprise so that it may output as a range offset. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, in each of a 1st detection range and a 2nd detection range, optimal visibility improvement is performed and the image change of each detection range boundary part can be eased. Become.

Further, in the liquid crystal display device according to the present invention, the two-detection-range-corresponding linear-change-gain creating section includes a boundary between a detection range for the first range signal level detection section and a detection range for the second range signal level detection section. A predetermined width is provided in the portion, and in the detection range based on the first range information excluding the predetermined width, the first range gain offset output from the first range gain control section is output as a gain offset corresponding to two detection ranges, and the predetermined width is output. In the detection range based on the second range information except for the second range gain control unit, the second range gain offset output from the second range gain control unit is output as a gain offset corresponding to two detection ranges, and in the range of the predetermined width, the first range gain control unit is output. Between the first range gain offset output from the second range gain offset and the second range gain offset output from the second range gain controller The linearly changed value is output as a gain offset corresponding to two detection ranges, and the first range gain output from the first range gain control unit is set to two detection ranges in the detection range based on the first range information excluding the predetermined width. In the detection range based on the second range information excluding the predetermined width, the second range gain output from the second range gain control unit is output as the two detection range corresponding gains. A value obtained by linearly changing between the first range gain output from the first range gain control unit and the second range gain output from the second range gain control unit is output as a gain corresponding to the two detection ranges. May be configured. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, in each of a 1st detection range and a 2nd detection range, optimal visibility improvement is performed and the image change of each detection range boundary part can be eased. Become.

In the liquid crystal display device according to the present invention, the two-detection-range-corresponding linear-change-offset creating section includes a boundary between a detection range for the first range signal level detection section and a detection range for the second range signal level detection section. A predetermined width is provided in the portion, and in the detection range based on the first range information excluding the predetermined width, the first range offset output from the first range offset control unit is output as an offset corresponding to two detection ranges, and the predetermined width is excluded. In the detection range according to the second range information, the second range offset output from the second range offset control unit is output as an offset corresponding to two detection ranges, and in the range of the predetermined width, the second range offset is output from the first range offset control unit. A linear change is made between the first range offset and the second range offset output from the second range offset controller. The value may be configured so as to output as a second detection range corresponding offset. ADVANTAGE OF THE INVENTION According to this invention comprised as mentioned above, in each of a 1st detection range and a 2nd detection range, optimal visibility improvement is performed and the image change of each detection range boundary part can be eased. Become.

Further, in the liquid crystal display device according to the present invention, the contrast circuit sets the input gain offset or a value corresponding thereto as a fixed point at the time of contrast adjustment, and sets the input gain or a value corresponding thereto at the time of contrast adjustment. May be used as the amplification gain. According to the present invention configured as described above, it is possible to perform control to obtain an output with improved visibility with respect to any input signal, centering on the intermediate luminance level. According to the present invention configured as described above, it is possible to control to obtain an output centered on the intermediate luminance level for any input signal, and to improve the visibility of the liquid crystal panel in a place with different illuminance. It becomes possible to plan. Further, according to the present invention, it is possible to avoid white-side signal collapse when the offset amount increases, to expand the white-side signal when the offset amount decreases, and to improve the visibility of the liquid crystal panel in places with different illuminance. Becomes possible. Further, according to the present invention, it is possible to improve the visibility of a specific range and to alleviate an image change at a boundary portion outside the specific range. Further, according to the present invention, optimal visibility improvement is performed in each of the first detection range and the second detection range,
It is possible to alleviate the image change at the boundary of each detection range.

Further, in the liquid crystal display device of the present invention, the liquid crystal panel section may be constituted by a reflection type liquid crystal panel which performs display using external light. According to the present invention configured as described above, it is possible to control to obtain an output centered on the intermediate luminance level for any input signal, and to improve the visibility of the liquid crystal panel in a place with different illuminance. It becomes possible to plan. According to the present invention configured as described above, it is possible to control to obtain an output centered on the intermediate luminance level for any input signal, and to avoid white-side signal collapse when the offset amount increases. Alternatively, it is possible to improve the visibility of the liquid crystal panel in places with different illuminances, such as white-side signal expansion when the offset amount is reduced.

[0030]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.

Embodiment 1 FIG. 1 is a block diagram showing a configuration of a liquid crystal display device of Embodiment 1 which is an embodiment of the present invention. FIG. 1 illustrates a configuration of a liquid crystal display device according to a first embodiment that displays input image data having a luminance signal and a color difference signal. In FIG. 1, the signal level detection unit 1
An average signal level, a maximum signal level, and a minimum signal level of the input luminance signal are detected based on the detection range information. The gain control unit 2 creates a gain and a gain offset for each of the R, G, and B signals according to the average signal level, the maximum signal level, and the minimum signal level output from the signal level detection unit 1. The offset control unit 3
According to the average signal level, maximum signal level, and minimum signal level output from the signal level detection unit 1 and the gain and gain offset output from the gain control unit 2,
An offset is created for each of the R, G, and B signals.

The decoding circuit 6 creates R, G and B signals from the input luminance signal and color difference signal. The contrast correction circuit 4 adjusts the contrast level of each of the R, G, and B signals output from the decoding circuit 6 according to the gain and the gain offset output from the gain control unit 2. The offset correction circuit 5 adjusts the offset level of each of the R, G, and B signals output from the contrast correction circuit 4 according to the offset signal output from the offset control unit 3. The gamma correction circuit 7
The R, G, and B signals output from the offset correction circuit 5 are subjected to gamma correction according to the voltage-transmittance characteristics of the liquid crystal panel unit 10. The polarity inversion amplification circuit 8 performs AC driving and signal amplification on each of the R, G, and B signals output from the gamma correction circuit 7. The timing generation circuit 9
A timing signal required for display is output to a circuit in the liquid crystal panel unit 10. The liquid crystal panel unit 10 displays an image based on the image data of each of the R, G, and B signals output from the polarity inversion amplifier circuit 8.

When, for example, the detection range information indicates the center of the screen, the signal level detector 1 detects the average signal level by averaging the input signals in the corresponding area and suppresses the high frequency range. A maximum value and a minimum value are created by performing a filtering process to detect the maximum signal level and the minimum signal level. Further, the gain control unit 2 uses, for example, an average signal level output from the signal level detection unit 1 as a gain offset, and sets a predetermined gain constant to a difference data between the maximum signal level and the minimum signal level output from the signal level detection unit 1. The value obtained by dividing by the limiter is output as the gain. FIG. 2 is a block diagram illustrating a configuration of the gain control unit 2. FIG. 3 is a graph showing the relationship between the gain and the difference between the maximum signal level and the minimum signal level. Further, the offset control unit 3 includes the signal level detection unit 1
The gain calculation processing is performed based on the maximum signal level and the minimum signal level output from the gain control section 2 and the gain offset and gain output from the gain control section 2. The offset control unit 3 sets an offset so that the maximum signal level and the minimum signal level after the gain calculation processing are arranged at equal positions around the intermediate signal level, and the average signal output from the signal level detection unit 1 The offset is shifted according to the level.

FIG. 4 is a block diagram showing one configuration example of the offset control section 3. If it is not desired to control the brightness of the screen of the liquid crystal panel unit 10 in a direction to lower the brightness by the offset output from the offset control unit 3, the offset output or the value of the portion indicated by C in FIG. May be configured to be clipped. The contrast correction circuit 4 sets the gain offset input from the gain control unit 2 or a value corresponding thereto as a fixed point during contrast adjustment, and sets the input gain or a value corresponding thereto as an amplification gain during contrast adjustment. FIG. 5 is a graph showing a change in the contrast correction circuit 4 due to a gain and a gain offset. FIG.
FIG. 5 is an explanatory diagram illustrating a change state of waveforms of various input signals in the liquid crystal display device according to the first embodiment. In FIG. 6, an input signal D shows a case where the applied gain is small, and an input signal E shows a case where the applied gain is large.
As shown in FIG. 6, in the first embodiment, it is possible to form an output signal whose center is at the intermediate signal level even for various input signals.

According to the liquid crystal display device of the first embodiment configured as described above, any input signal is subjected to offset correction so that the intermediate signal level is substantially centered, and an output with improved visibility is obtained. It is possible to obtain. Note that the gain control unit 2 of the first embodiment may be configured to set the gain offset by the ratio of the difference between the maximum signal level and the average signal level and the difference between the average signal level and the minimum signal level. FIG. 7 is a block diagram showing a configuration of the liquid crystal display device when each of R, G, and B signals is input image data. The main configuration of the liquid crystal display device shown in FIG. 7 is substantially the same as that of the liquid crystal display device shown in FIG. 1 except that the decoding circuit 6 is not provided in the liquid crystal display device of FIG. Only. According to the liquid crystal display device having the configuration shown in FIG. 7, the same effects as those of the input image data composed of the luminance signal and the color difference signal described above can be obtained for the input image data composed of the R, G, and B signals. .

Embodiment 2 Next, a liquid crystal display device according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 8 is a block diagram illustrating a configuration of a liquid crystal display device according to a second embodiment in which a luminance signal and a color difference signal are used as input image data. In FIG. 8, the same functions as those in the first embodiment described above,
Components having the same configuration are denoted by the same reference numerals, and the description of the first embodiment is referred to. In FIG. 8, the illuminance detection unit 21 detects the brightness of the panel surface or the periphery of the liquid crystal panel.
The signal level detection unit 1 is, as in the first embodiment,
An average signal level, a maximum signal level, and a minimum signal level of the input luminance signal are detected based on the detection range information. The gain control unit 2 creates a gain and a gain offset for each of the R, G, and B signals according to the average signal level, the maximum signal level, and the minimum signal level output from the signal level detection unit 1.

FIG. 9 is a block diagram showing an example of the configuration of the illuminance offset control section 22 according to the second embodiment. In the second embodiment, the configuration other than the illuminance offset control unit 22 and the illuminance detection unit 21 is the same as that of the first embodiment shown in FIG. 1 described above. The illuminance offset control unit 22 according to the second embodiment includes an average signal level, a maximum signal level, and a minimum signal level output from the signal level detection unit 1, a gain and a gain offset output from the gain control unit 2, and illuminance. A illuminance offset is created for each of the R, G, and B signals according to the illuminance signal output from the detection unit 21. As in the first embodiment, the decoding circuit 6
Creates R, G, and B signals from the input luminance signal and color difference signal. The contrast correction circuit 4 adjusts the contrast level of each of the R, G, and B signals output from the decoding circuit 6 according to the gain and the gain offset output from the gain control unit 2. The offset correction circuit 5 outputs the contrast correction circuit 4 according to the illuminance offset signal output from the illuminance offset control unit 22.
The offset level of each of the R, G, and B signals output from is adjusted. The gamma correction circuit 7 applies the R, G, and B signals output from the offset correction circuit 5 to the liquid crystal panel unit 10.
Gamma correction is performed according to the voltage-transmittance characteristics. The polarity inversion amplifying circuit 8 outputs R, G,
AC driving and signal amplification are performed on each signal of B. The timing generation circuit 9 outputs a timing signal necessary for display to a circuit in the liquid crystal panel. LCD panel 1
0 indicates image data by the R, G, B signals from the polarity inversion amplifier circuit 8.

The illuminance offset control section 22 performs a gain calculation process based on the maximum signal level and the minimum signal level output from the signal level detection section 1 and the gain offset and gain output from the gain control section 2. The illuminance offset control unit 22 sets an offset such that the maximum signal level and the minimum signal level after the gain calculation processing are arranged at equal positions around the intermediate signal level, and the illuminance output from the illuminance detection unit 21. And the offset is shifted according to the average signal level output from the signal level detection unit 1.

FIG. 10 is an explanatory diagram showing a change state of the waveform of the input signal in the second embodiment. As shown in FIG. 10, the offset control for the input signal H in the second embodiment shifts to a bright side when the illuminance is low and to a dark side when the illuminance is high, in addition to the control similar to the above-described first embodiment. Will be done. The input signal H shown in FIG. 10 shows a state in which the shift amount for the case where the average signal level is low is suppressed.

According to the liquid crystal display device of the second embodiment configured as described above, it is possible to control to obtain an output centered on the intermediate signal level for any input signal, and in addition, to a location where the illuminance differs. , The visibility of the liquid crystal panel can be improved. Further, according to the liquid crystal display device of the second embodiment, since the visibility of the liquid crystal panel is improved in places where the illuminance is different, a particularly effective effect is exhibited in the reflective liquid crystal panel. The gain controller 2 of the second embodiment sets the gain offset by the ratio of the difference between the maximum signal level and the average signal level and the difference between the average signal level and the minimum signal level, as in the first embodiment. May be configured. Further, the liquid crystal display device of the second embodiment has a configuration in which the R, G, and B signals are used as the input image data as in the embodiment of FIG. The same effect as in the case is obtained.

Third Embodiment Next, a liquid crystal display device according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 11 is a block diagram illustrating a configuration of a liquid crystal display device according to a third embodiment in which a luminance signal and a color difference signal are used as input image data. In FIG. 11, components having the same functions and configurations as those of the first embodiment are denoted by the same reference numerals, and the description of the first embodiment is used. In FIG. 11, the illuminance detection unit 21
Detects the brightness of the panel surface or the surroundings of the liquid crystal panel. The signal level detection unit 1 determines
An average signal level, a maximum signal level, and a minimum signal level of the input luminance signal are detected. Gain control unit 2
Is determined according to the average signal level, the maximum signal level, and the minimum signal level output from the signal level detection unit 1.
A gain offset and a gain for each of the R, G, and B signals are created.

The illuminance correction value control unit 30 includes an average signal level, a maximum signal level, and a minimum signal level output from the signal level detection unit 1, a gain and a gain offset output from the gain control unit 2, and an illuminance detection unit. In accordance with the illuminance signal output from 21, an illuminance correction gain and an illuminance correction offset for each of the R, G, and B signals are created. The decoding circuit 6 creates R, G, and B signals from the input luminance signal and color difference signal. The contrast correction circuit 4 outputs R, R output from the decode circuit 6 in accordance with the gain offset output from the gain control unit 2 and the illuminance correction gain output from the illuminance correction value control unit 30.
The contrast level of each of the G and B signals is adjusted. The offset correction circuit 5 includes a contrast correction value control unit 30
The offset level of each of the R, G, and B signals output from the contrast correction circuit 4 is adjusted in accordance with the contrast correction offset signal output from. Gamma correction circuit 7
Performs gamma correction on the R, G, and B signals output from the offset correction circuit 5 according to the voltage-transmittance characteristics of the liquid crystal panel. The polarity inversion amplification circuit 8 performs AC driving and signal amplification on the R, G, and B signals output from the gamma correction circuit 7. The timing generation circuit 9 outputs a timing signal necessary for display to a circuit in the liquid crystal panel. The liquid crystal panel unit 10 displays image data according to the R, G, B signals from the polarity inversion amplifier circuit 8.

FIG. 12 is a block diagram showing an example of the configuration of the illuminance correction value control unit 30 according to the third embodiment. In the third embodiment, the configuration other than the illuminance correction value control unit 30 is the same as that of the second embodiment shown in FIG. The illuminance correction value control unit 30 according to the third embodiment performs a gain calculation process based on the maximum signal level and the minimum signal level output from the signal level detection unit 1 and the gain offset and gain output from the gain control unit 2. . The illuminance correction value control unit 30 sets an offset so that the maximum signal level and the minimum signal level after the gain calculation processing are arranged at substantially equal positions around the intermediate signal level. The offset is shifted according to the measured illuminance and the average signal level output from the signal level detection unit 1. Further, the illuminance correction value control unit 30 outputs a value obtained by suppressing or expanding the gain output from the gain control unit 2 according to the offset shift amount as an illuminance correction gain.

FIG. 13 is an explanatory diagram showing a change state of the waveform of the input signal in the third embodiment. As shown in FIG.
The control for the input signal K is similar to the control described in the second embodiment, except that the gain output from the gain control unit 2 is suppressed according to the offset amount that shifts to the bright side when the illuminance is low, and the suppression is performed. The gain thus set is set as a contrast correction gain. FIG. 13 shows a state in which the shift amount for the case where the average luminance level is low is suppressed. According to the liquid crystal display device of the third embodiment configured as described above, it is possible to control to obtain an output centered on the intermediate signal level with respect to any input signal, and it is also possible to control the case where the offset amount increases. It is possible to avoid white-side signal expansion or the like when the white-side signal collapse and the offset amount are reduced, and to improve the visibility of the liquid crystal panel in places with different illuminances.

According to the liquid crystal display of the third embodiment,
Since the visibility of the liquid crystal panel is improved in places where the illuminance is different, a particularly effective effect is exhibited in the reflective liquid crystal panel. The gain control unit 2 of the third embodiment sets the gain offset by the ratio between the difference between the maximum signal level and the average signal level and the difference between the average signal level and the minimum signal level as in the first embodiment. May be configured. Further, the liquid crystal display device of the third embodiment has a configuration in which the R, G, and B signals are used as the input image data as in the embodiment of FIG. The same effect as in the case is obtained.

Embodiment 4 Next, a liquid crystal display device according to Embodiment 4 of the present invention will be described with reference to FIGS. FIG. 14 is a block diagram illustrating a configuration of a liquid crystal display device according to a fourth embodiment in which a luminance signal and a color difference signal are used as input image data. In FIG. 14, components having the same functions and configurations as those of the first embodiment are denoted by the same reference numerals, and the description of the first embodiment is referred to. In FIG. 14, the signal level detector 1
Detects the average signal level, the maximum signal level, and the minimum signal level of the input luminance signal based on the detection range information. The gain control unit 2 creates a gain and a gain offset for each of the R, G, and B signals according to the average signal level, the maximum signal level, and the minimum signal level output from the signal level detection unit 1. Offset control unit 3
Represents an offset for each of the R, G, and B signals according to the average signal level, the maximum signal level, and the minimum signal level output from the signal level detection unit 1 and the gain and gain offset output from the gain control unit 2. create.

The linear change gain creating section 40 calculates R, R, and R in accordance with the detection range information for the signal level detection section 1 and the gain and gain offset output from the gain control section 2.
A linear change gain and a linear change gain offset for each of the G and B signals are created. The linear change offset creating unit 41 calculates the linear range offset based on the detection range information for the signal level detection unit 1 and the offset output from the offset control unit 3.
A linear change offset for each of the R, G, and B signals is created. As in the first embodiment, the decoding circuit 6
Creates R, G, and B signals from the input luminance signal and color difference signal. The contrast correction circuit 4 adjusts the contrast level of each of the R, G, and B signals output from the decoding circuit 6 according to the linear change gain and the linear change gain offset output from the linear change gain creation unit 40. The offset correction circuit 5 adjusts the offset level of each of the R, G, and B signals output from the contrast correction circuit 4 according to the linear change offset signal output from the linear change offset creation unit 41. The gamma correction circuit 7 performs gamma correction on the R, G, and B signals output from the offset correction circuit 5 according to the voltage-transmittance characteristics of the liquid crystal panel. Polarity inversion amplifier 8
Performs AC driving and signal amplification on the R, G, and B signals output from the gamma correction circuit 7. The timing generation circuit 9 outputs a timing signal necessary for display to a circuit in the liquid crystal panel. The liquid crystal panel unit 10 displays image data according to the R, G, B signals from the polarity inversion amplifier circuit 8.

The linear change gain creating section 40 provides a predetermined width in a detection range for the signal level detection section 1 and a boundary portion outside the detection range. The linear change gain creating unit 40 outputs the gain offset output from the gain control unit 2 as a linear change gain offset within the detection range excluding the predetermined width, and is outside the detection range outside the detection range excluding the predetermined width. Is output as a linear change gain offset. Further, within the range of the predetermined width, a value obtained by linearly changing between the gain offset output from the gain control unit 2 and the predetermined gain offset set outside the detection range is defined as a linear change gain offset. The gain output from the gain control unit 2 is output as a linear change gain within a detection range excluding the predetermined width. Further, the linear change gain creating section 4
0 outputs a predetermined gain set outside the detection range as a linear change gain outside the detection range excluding the predetermined width, and detects the gain output from the gain control unit 2 within the predetermined width range. A value obtained by linearly changing between a predetermined gain set outside the range and a predetermined gain is output as a linear change gain.

The linear change offset creating section 41 provides a predetermined width at the boundary between the detection range for the signal level detection section 1 and the outside of the detection range. The output offset is output as a linear change offset. The linear change offset creating unit 41 outputs a predetermined offset set outside the detection range as a linear change offset outside the detection range excluding the predetermined width, and within a range of the predetermined width, the offset control unit 3 A linearly changed value is output as a linearly changed offset between the offset output from the controller and a predetermined offset set outside the detection range. FIG. 15 is an explanatory diagram illustrating a change state of the linear change gain. At a predetermined width provided at the boundary of the detection range, the gain changes linearly. FIG. 16 is an enlarged view showing a gain change in a predetermined width provided at the boundary of the detection range. FIG. 17 is a circuit for calculating a gain having a predetermined width in FIG. FIGS. 15, 16 and 17 illustrate the linear change gain output from the linear change gain generator 40. The linear change gain offset and the linear change offset generator 41 output from the linear change gain generator 40 are described. It is also possible to realize a linear change by the same processing for the linear change offset output from.

In the liquid crystal display device of the fourth embodiment shown in FIG. 14, the structure other than the linear change gain creating section 40 and the linear change offset creating section 41 is the same as that of the first embodiment.
This is the same as the liquid crystal display device. According to the liquid crystal display device of Embodiment 4 configured as described above, the visibility within the detection range can be improved, and the image change at the boundary with the range outside the detection range can be reduced. .
In the liquid crystal display device according to the fourth embodiment, the gain in the predetermined width provided at the boundary of the detection range is configured to change linearly. However, the gain in the predetermined width may be configured to change in a curved line. It is. FIG. 18 is based on the assumption that the gain at the predetermined width changes in a curved shape, with the aim of further reducing the image change at the predetermined width portion.
FIG. 2 is a block diagram illustrating a configuration of a liquid crystal display device using a curved ROM. FIG. 19 shows a curve change state of the gain in a predetermined width. FIG. 19 shows the state of the curve change gain, but the curve change gain offset and the curve change offset also change in a curve in the same manner. Note that the gain control unit 2 according to the fourth embodiment includes:
As in the first embodiment, the gain offset may be set by the ratio between the difference between the maximum signal level and the average signal level and the difference between the average signal level and the minimum signal level. Further, the liquid crystal display device of the fourth embodiment is the same as that of FIG.
As in the embodiment, even when the R, G, and B signals are used as the input image data, the same effect as in the case of the input image data including the luminance signal and the color difference signal can be obtained.

Fifth Embodiment Next, a liquid crystal display device according to a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 20 is a block diagram illustrating a configuration of a liquid crystal display device according to a fifth embodiment in which a luminance signal and a color difference signal are used as input image data. In FIG. 20, components having the same functions and configurations as those of the first embodiment are denoted by the same reference numerals, and the description of the first embodiment is referred to. In the liquid crystal display device of the fifth embodiment,
Correction processing is separately performed on the information on the screen area at the center of the screen as the first range information and the information on the screen area at the periphery of the screen as the second range information. In FIG. 20, a first range signal level detector 51 detects a first range average signal level, a first range maximum signal level, and a first range minimum signal level of an input luminance signal based on the first range information. . The first range gain control unit 52 outputs R, G, B according to the first range average signal level, the first range maximum signal level, and the first range minimum signal level output from the first range signal level detection unit 51. , A first range gain and a first range gain offset for each signal are created. First
The range offset control unit 53 outputs the first range average signal level, the first range maximum signal level, the first range minimum signal level output from the first range signal level detection unit 51, and the first range gain signal control unit 52. A first range offset for each of the R, G, and B signals is created according to the first range gain and the first range gain offset.

The second range signal level detector 54 detects a second range average signal level, a second range maximum signal level, and a second range minimum signal level of the input luminance signal based on the second range information. The second range gain control unit 55 outputs R, G, B according to the second range average signal level, the second range maximum signal level, and the second range minimum signal level output from the second range signal level detection unit 54. , A second range gain and a second range gain offset are created for each signal. The second range offset control unit 56 outputs the second range average signal level, the second range maximum signal level, and the second range minimum signal level output from the second range signal level detection unit 54 and the second range gain control unit 55. According to the output second range gain and second range gain offset, R,
A second range offset is created for each of the G and B signals.

A linear change gain generator 57 corresponding to two detection ranges.
Are the first range information for the first range signal level detector 51, the second range information for the second range signal level detector 54, the first range gain and the first range gain output from the first range gain controller 52. According to the offset and the second range gain and the second range gain offset output from the second range gain control unit 55, the two detection range corresponding gain and the two detection range corresponding gain offset for each of the R, G, and B signals are set. create. The two-detection-range-corresponding linear-change offset creation unit 58 is output from the first range information for the first range signal level detection unit 51, the second range information for the second range signal level detection unit 54, and the first range offset control unit 53. In accordance with the first range offset and the second range offset output from the second range offset control unit 56,
An offset corresponding to two detection ranges is created for each of the R, G, and B signals.

The decoding circuit 6 creates R, G and B signals from the input luminance signal and color difference signal. The contrast correction circuit 4 outputs the R, G, and B signals output from the decoding circuit 6 according to the two detection range corresponding gain and the two detection range corresponding gain offset output from the two detection range corresponding linear change gain creating unit 57. Adjust the contrast level. The offset correction circuit 5 adjusts the offset levels of the R, G, and B signals output from the contrast correction circuit 4 according to the two detection range corresponding offset signals output from the two detection range corresponding linear change offset control unit 58. . The gamma correction circuit 7 performs gamma correction on the R, G, and B signals output from the offset correction circuit 5 according to the voltage-transmittance characteristics of the liquid crystal panel. The polarity inversion amplifying circuit 8 outputs the R, G,
AC driving and signal amplification are performed on each signal of B. The timing generation circuit 9 outputs a timing signal necessary for display to a circuit in the liquid crystal panel. LCD panel 1
0 indicates image data by the R, G, B signals from the polarity inversion amplifier circuit 8.

The first range signal level detecting section 51 performs an averaging of input signals and a filtering process for suppressing a high frequency band in an arbitrary screen area in the center of the screen based on the first range information. Create maximum and minimum values.
Further, the second range signal level detection unit 54 performs the averaging of the input signal for an arbitrary screen area in the peripheral portion of the screen based on the second range information, and performs the maximum filtering performed to suppress the high frequency range. Create value, minimum value. Further, for example, the first range gain control unit 52 outputs the first range average signal level output from the first range signal level detection unit 51 as a first range gain offset. The first range gain controller 52 outputs a first range gain corresponding to difference data between the first range maximum signal level and the first range minimum signal level output from the first range signal level detector 51. The second range gain controller 55 outputs the second range average signal level output from the second range signal level detector 54 as a second range gain offset. Further, the second range gain controller 55 outputs a second range gain corresponding to the difference data between the second range maximum signal level and the second range minimum signal level output from the second range signal level detector 54. .

The first range offset control unit 53 outputs the first range maximum signal level and the first range minimum signal level output from the first range signal level detection unit 51 and the first range gain control unit 52. A gain calculation process is performed on the first range gain offset and the first range gain. The first range offset control unit 53 sets an offset such that the maximum signal level and the minimum signal level after the gain calculation processing are arranged at equal positions around the intermediate signal level, and the first range signal level detection unit 51 And outputs a value obtained by shifting the offset according to the first range average signal level output from the first range as a first range offset. Second
The range offset control unit 56 includes a second range maximum signal level and a second range minimum signal level output from the second range signal level detection unit 54, and a second range gain offset output from the second range gain control unit 55. And the second range gain is subjected to gain calculation processing. The second range offset control unit 56 sets an offset so that the maximum signal level and the minimum signal level after the gain calculation processing are arranged at equal positions around the intermediate signal level, and the second range signal level detection unit 54 And outputs a value obtained by shifting the offset according to the second range average signal level output from the second range as a second range offset.

A linear change gain generator 57 corresponding to two detection ranges.
In the example, a predetermined width is defined at the boundary between the detection range for the first range signal level detection unit 51 and the detection range for the second range signal level detection unit 54. The two-detection-range-corresponding linear-change-gain creating unit 57 sets the first range gain offset output from the first range gain control unit 52 as a two-detection-range-corresponding gain offset within the detection range based on the first range information excluding the predetermined width. Output. In addition, the two-detection-range-corresponding linear-change-gain creating unit 57 performs a second
In the detection range based on the range information, the second range gain controller 55
Is output as the gain offset corresponding to the two detection ranges, and within the range of the predetermined width, the first range gain offset and the second range gain control output from the first range gain controller 52 are output. A value obtained by linearly changing the value from the second range gain offset output from 55 is output as a gain offset corresponding to the two detection ranges.

In addition, the two-detection-range-corresponding linear-change-gain creating unit 57 applies the first range gain output from the first-range-gain control unit 52 to the two detection ranges in the detection range based on the first range information excluding the predetermined width. The second range gain output from the second range gain control unit 55 is output as a gain corresponding to the two detection ranges in the detection range based on the second range information excluding the predetermined width. In addition, the two-detection-range-corresponding linear-change-gain creating unit 57 outputs the first range gain output from the first range gain control unit 52 and the second range gain output from the second range gain control unit 55 in the range of the predetermined width. A value obtained by linearly changing the gain and the gain is output as a gain corresponding to the two detection ranges.

The two-detection-range-corresponding linear-change offset creating section 58 defines a predetermined width at the boundary between the detection range for the first range signal level detection section 51 and the detection range for the second range signal level detection section 54. The two-detection-range-corresponding straight-line-change offset creating unit 58 performs the first detection except for the predetermined width.
In the detection range based on the range information, the first range offset output from the first range offset control unit 53 is output as an offset corresponding to two detection ranges. In addition, the two-detection-range-corresponding linear-change offset creating unit 58 performs the second
In the detection range based on the range information, the second range offset output from the second range offset control unit 56 is output as an offset corresponding to two detection ranges.
A value obtained by linearly changing between the first range offset output from the range offset control unit 53 and the second range offset output from the second range offset control unit 56 is 2
Output as the detection range corresponding offset. In the liquid crystal display device according to the fifth embodiment, a method similar to that of the fourth embodiment described above is employed for linear changes in gain, gain center, and offset. According to the liquid crystal display device of Embodiment 5 configured as described above, in each of the first detection range and the second detection range, optimal visibility can be improved, and the boundary between the detection ranges can be improved. Image changes are reduced.

[0060]

According to the liquid crystal display device of the present invention, the signal level detector detects the average signal level, the maximum signal level, and the minimum signal level of the input luminance signal based on the detection range information, and detects the detected average signal level. The gain control unit and the offset control unit are configured to perform desired processing according to the level, maximum signal level, and minimum signal level signals. It is possible to control to obtain an output, and it is possible to obtain an output with improved visibility. Since the liquid crystal display device of the present invention is provided with an illuminance detection unit and configured to process a signal from the illuminance detection unit in the illuminance offset control unit, it is possible to improve the visibility of the liquid crystal panel in a place where the illuminance is different. It has the effect of being able to. Since the liquid crystal display device of the present invention is provided with the illuminance correction value control unit, the illuminance is different, such as avoiding white-side signal collapse when the offset amount increases or expanding the white-side signal when the offset amount decreases. This has the effect of improving the visibility of the liquid crystal panel at the place. Since the liquid crystal display device of the present invention is provided with the linear change gain creating section and the linear change offset creating section, while improving the visibility of a specific range,
It is possible to alleviate a change in image at a boundary portion outside the specific range. In the liquid crystal display device of the present invention, since the detection unit and the control unit are provided in each of the first detection range and the second detection range, the liquid crystal display device has the optimum configuration in each of the first detection range and the second detection range. The visibility is improved, and the effect of reducing the image change at the boundary of each detection range is achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a liquid crystal display device that displays input image data having a luminance signal and a color difference signal according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a gain control unit in the liquid crystal display device according to the first embodiment of the present invention.

FIG. 3 is a graph showing a relationship between a gain and a difference between a maximum signal level and a minimum signal level according to the first embodiment of the present invention.

FIG. 4 is a block diagram illustrating an example of an offset control unit according to the first embodiment of the present invention.

FIG. 5 is a graph showing changes due to gain and gain offset in the contrast correction circuit according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating a waveform change of an input signal according to the first embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of a liquid crystal display device that displays input image data of R, G, and B signals according to the first embodiment of the present invention.

FIG. 8 is a block diagram illustrating a configuration of a liquid crystal display device that displays input image data having a luminance signal and a color difference signal according to a second embodiment of the present invention.

FIG. 9 is a block diagram illustrating an example of a illuminance offset control unit according to the second embodiment of the present invention.

FIG. 10 is a graph showing a waveform change of an input signal according to the second embodiment of the present invention.

FIG. 11 is a block diagram illustrating a configuration of a liquid crystal display device that displays input image data having a luminance signal and a color difference signal according to a third embodiment of the present invention.

FIG. 12 is a block diagram illustrating an example of a illuminance correction value control unit according to a third embodiment of the present invention.

FIG. 13 is a graph showing a waveform change of an input signal according to the third embodiment of the present invention.

FIG. 14 is a block diagram illustrating a configuration of a liquid crystal display device that displays input image data having a luminance signal and a color difference signal according to a fourth embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a change state of a linear change gain in Embodiment 4 of the present invention.

FIG. 16 is an enlarged view showing a state of a gain change in a predetermined width portion in Embodiment 4 of the present invention.

FIG. 17 is a diagram illustrating a gain calculation circuit in consideration of the gain change illustrated in FIG. 16 according to the fourth embodiment of the present invention.

FIG. 18 is a block diagram illustrating a configuration of a liquid crystal display device using a curved ROM according to a fourth embodiment of the present invention.

FIG. 19 is an explanatory diagram illustrating a curve-shaped change state of a gain according to the fourth embodiment of the present invention.

FIG. 20 is a block diagram illustrating a configuration of a liquid crystal display device that displays input image data having a luminance signal and a color difference signal according to Embodiment 5 of the present invention.

FIG. 21 is a block diagram illustrating a configuration of a conventional liquid crystal display device.

FIG. 22 is a conceptual diagram showing a change state of an input signal in a conventional liquid crystal display device.

FIG. 23 is a conceptual diagram showing a change state of an input signal in a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal level detection part 2 Gain control part 3 Offset control part 4 Contrast correction circuit 5 Offset correction circuit 6 Decoding circuit 7 Gamma correction circuit 8 Polarity inversion amplification circuit 9 Timing generation circuit 10 Liquid crystal panel part 21 Illuminance detection part 22 Contrast offset control Unit 30 Contrast correction value control unit 40 Linear change gain creation unit 41 Linear change offset creation unit 42 Curve change gain creation unit 43 Gain curve ROM 44 Curve change offset creation unit 45 Offset curve ROM 51 First range signal level detection unit 52 1st range gain control unit 53 1st range offset control unit 54 2nd range signal level detection unit 55 2nd range gain control unit 56 2nd range offset control unit 57 2 detection range corresponding linear change gain creation unit 58 2 detection range Corresponding linear change offset creation unit 1 signal peak detector 72 offset setting unit 73 gain setting unit

Continued on the front page F term (reference) 5C006 AA11 AA22 AC21 AF45 AF46 BB11 BC16 FA54 FA56 5C060 DB09 DB11 EA00 HB00 HB16 HB30 JA17 JA18 5C080 AA10 BB05 CC03 DD03 EE29 FF09 GG08 JJ02 JJ04 JJ05

Claims (23)

[Claims] A liquid crystal panel for displaying an image based on input image data having a luminance signal and a color difference signal; detecting an average signal level, a maximum signal level, and a minimum signal level of the input luminance signal based on detection range information; A signal level detection unit, an average signal level output from the signal level detection unit,
According to the signal of the maximum signal level and the signal of the minimum signal level,
A gain control unit that creates a gain and a gain offset for each of the R, G, and B signals; an average signal level output from the signal level detection unit;
An offset control unit that creates an offset for each of the R, G, and B signals in accordance with each of the maximum signal level and the minimum signal level and the gain and gain offset output from the gain control unit; A decoding circuit that creates R, G, and B signals from the color difference signal; R and G output from the decoding circuit according to the gain and gain offset output from the gain control unit;
A contrast correction circuit for adjusting the contrast level of each of the G and B signals; R,
An offset correction circuit for adjusting an offset level of each of the G and B signals; and a gamma corresponding to the voltage-transmittance characteristic of the liquid crystal panel unit for each of the R, G and B signals output from the offset correction circuit. A gamma correction circuit for performing correction; a polarity inversion amplifier circuit for performing AC driving and amplifying signals for each of the R, G, and B signals output from the gamma correction circuit; A liquid crystal display device comprising: a timing generation circuit that outputs a necessary timing signal. 2. A liquid crystal panel for displaying an image based on input image data having R, G, and B signals, based on detection range information, an average signal level of input R, G, and B signals, and a maximum signal level. A signal level detection unit that detects a signal level and a minimum signal level, an average signal level output from the signal level detection unit,
According to each signal of the maximum signal level and the minimum signal level,
A gain control unit that creates a gain and a gain offset for each of the R, G, and B signals; an average signal level output from the signal level detection unit;
An offset control unit for creating an offset for each of the R, G, and B signals in accordance with each of the maximum signal level and the minimum signal level and the gain and gain offset output from the gain control unit; A contrast correction circuit that adjusts the contrast level of each of the input R, G, and B signals according to the gain and the gain offset, and from the contrast correction circuit according to the offset signal that is output from the offset control unit. Output R,
An offset correction circuit for adjusting an offset level of each of the G and B signals; a gamma correction for each of the R, G and B signals output from the offset correction circuit in accordance with a voltage-transmittance characteristic of the liquid crystal panel unit A gamma correction circuit that performs AC driving and amplifies the signals for each of the R, G, and B signals output from the gamma correction circuit, and displays a signal in a circuit in the liquid crystal panel unit. A liquid crystal display device comprising: a timing generation circuit that outputs a necessary timing signal. 3. A liquid crystal panel section for displaying an image based on input image data having a luminance signal and a color difference signal, an illuminance detection section for detecting the brightness of a surface or a periphery of the liquid crystal panel section, An average signal level of the input luminance signal, a signal level detection unit that detects a maximum signal level and a minimum signal level, an average signal level output from the signal level detection unit,
According to each signal of the maximum signal level and the minimum signal level,
A gain control unit that creates a gain and a gain offset for each of the R, G, and B signals; an average signal level output from the signal level detection unit;
R and R are determined according to the maximum signal level and the minimum signal level, the gain and gain offset output from the gain control unit, and the illuminance signal output from the illuminance detection unit.
A illuminance offset control unit that creates illuminance offsets for the G and B signals, a decoding circuit that creates R, G, and B signals from the input luminance signal and chrominance signal, output from the gain control unit According to the gain and gain offset, R,
A contrast correction circuit for adjusting a contrast level of each of the G and B signals; and R, G, and B signals output from the contrast correction circuit in response to the illuminance offset signal output from the illuminance offset control unit. An gamma correction circuit that performs gamma correction on each of the R, G, and B signals output from the offset correction circuit in accordance with the voltage-transmittance characteristic of the liquid crystal panel unit; A polarity inversion amplifier circuit for performing AC driving and signal amplification on each of the R, G, and B signals output from the gamma correction circuit, and outputting a timing signal required for display to a circuit in the liquid crystal panel unit. A liquid crystal display device comprising a timing generation circuit. 4. A liquid crystal panel section for displaying an image based on input image data having a luminance signal and a color difference signal, an illuminance detection section for detecting brightness of a surface portion or a periphery of the liquid crystal panel section, An average signal level of the input luminance signal, a signal level detection unit that detects a maximum signal level and a minimum signal level, an average signal level output from the signal level detection unit,
According to each signal of the maximum signal level and the minimum signal level,
A gain control unit that creates a gain offset and a gain for each of the R, G, and B signals; an average signal level output from the signal level detection unit;
R and R are determined according to the maximum signal level and the minimum signal level, the gain and gain offset output from the gain control unit, and the illuminance signal output from the illuminance detection unit.
A illuminance correction value control unit that generates illuminance correction gain and illuminance correction offset for each of the G and B signals; a decoding circuit that generates R, G, and B signals from the input luminance signal and color difference signal; R, G, B output from the decoding circuit according to the gain offset output from the gain control unit and the illuminance correction gain output from the illuminance correction value control unit.
A contrast correction circuit for adjusting the contrast level of each signal of the following: offset levels of the R, G, B signals output from the contrast correction circuit in response to the illuminance correction offset signal output from the illuminance correction value control unit A gamma correction circuit that performs gamma correction on each of the R, G, and B signals output from the offset correction circuit in accordance with a voltage-transmittance characteristic of a liquid crystal panel unit; Polarity inverting amplifier circuit for performing AC driving and signal amplification for each of the R, G, and B signals output from the LCD, and a timing generation circuit for outputting a timing signal required for display to a circuit in the liquid crystal panel unit A liquid crystal display device comprising: 5. A liquid crystal panel section for displaying an image based on input image data having a luminance signal and a color difference signal, detecting an average signal level, a maximum signal level and a minimum signal level of the input luminance signal based on detection range information. A signal level detection unit, an average signal level output from the signal level detection unit,
According to each signal of the maximum signal level and the minimum signal level,
A gain control unit that creates a gain and a gain offset for each of the R, G, and B signals; an average signal level output from the signal level detection unit;
An offset control unit that creates an offset for each of the R, G, and B signals in accordance with each of the maximum signal level and the minimum signal level and the gain and gain offset output from the gain control unit; A linear change gain creating section for creating a linear change gain and a linear change gain offset for each of the R, G, and B signals according to the detection range information and the gain and gain offset output from the gain control section; R, R in accordance with the detection range information for the section and the offset output from the offset control section.
A linear change offset creating unit for creating a linear change offset for each of the G and B signals; a decoding circuit for creating R, G and B signals from the input luminance signal and color difference signal; and an output from the linear change gain creating unit A contrast correction circuit for adjusting the contrast levels of the R, G, and B signals output from the decoding circuit in accordance with the obtained linear change gain and the linear change gain offset; and a linear change offset output from the linear change offset generator. An offset correction circuit that adjusts an offset level of R, G, and B signals output from the contrast correction circuit according to a signal; and the liquid crystal panel for each of the R, G, and B signals output from the offset correction circuit. Gamma correction circuit that performs gamma correction according to the voltage-transmittance characteristics of the unit, A polarity inverting amplifier circuit for performing AC driving and signal amplification on each of the output R, G, and B signals; a timing generating circuit for outputting a timing signal necessary for display to a circuit in the liquid crystal panel unit; A liquid crystal display device comprising: 6. A liquid crystal panel for displaying an image based on input image data having a luminance signal and a color difference signal, detecting an average signal level, a maximum signal level and a minimum signal level of the input luminance signal based on detection range information. A signal level detection unit, an average signal level output from the signal level detection unit,
According to each signal of the maximum signal level and the minimum signal level,
A gain control unit that creates a gain and a gain offset for each of the R, G, and B signals; an average signal level output from the signal level detection unit;
An offset control unit for creating an offset for each of the R, G, and B signals in accordance with each of the maximum signal level and the minimum signal level and the gain and gain offset output from the gain control unit; A curve change gain creation section for creating a curve change gain and a curve change gain offset for each of R, G, and B signals in accordance with the detection range information and the gain and gain offset output from the gain control section; A gain curve ROM for setting a change in a gain and a gain offset to a curve change in a creation unit; R, R, and R in accordance with detection range information for the signal level detection unit and an offset output from the offset control unit;
A curve change offset creating section for creating a curve change offset for each of the G and B signals; and an offset curve forming RO for setting the offset change to a curve change in the curve change offset creating section.
M: a decoding circuit for creating R, G, and B signals from the input luminance signal and color difference signal; and the decoding circuit according to the curve change gain and the curve change gain offset output from the curve change gain creation section. Correction circuit for adjusting the contrast level of each of the R, G, and B signals output from R, G, and B output from the contrast correction circuit according to the curve change offset signal output from the curve change offset control unit. , B, and an offset correction circuit that adjusts the offset level of each signal, and performs gamma correction on each of the R, G, and B signals output from the offset correction circuit according to the voltage-transmittance characteristic of the liquid crystal panel unit. A gamma correction circuit for performing AC driving and signal amplification on each of the R, G, and B signals output from the gamma correction circuit; The liquid crystal display device characterized by comprising polarity inverting amplifier circuit, and a circuit, a timing generator for outputting a timing signal required for display to the circuits in the liquid crystal panel unit. 7. A liquid crystal panel unit for displaying an image based on input image data having a luminance signal and a color difference signal, based on the first range information, a first range average signal level and a first range maximum signal of the input luminance signal. A first range signal level detector for detecting a level and a first range minimum signal level; a first range average signal level, a first range maximum signal level, and a first range minimum signal output from the first range signal level detector. A first range gain control unit that creates a first range gain and a first range gain offset for each of the R, G, and B signals in accordance with each level signal, and a first range gain control unit that is output from the first range signal level detection unit. 1 range average signal level, 1st range maximum signal level, and 1st range minimum signal level, and 1st range gain and 1st range gain output from the 1st range gain control unit A first range offset control unit for creating a first range offset for each of the R, G, and B signals in accordance with the offset; a second range average signal level of the input luminance signal based on the second range information; A second range signal level detector for detecting a range maximum signal level and a second range minimum signal level; a second range average signal level, a second range maximum signal level, and a second range signal level output from the second range signal level detector; A second range gain control unit that creates a second range gain and a second range gain offset for each of the R, G, and B signals in accordance with each signal of the minimum range signal level; output from the second range signal level detection unit The second range average signal level, the second range maximum signal level, and the second range minimum signal level, and the second range gain and the second range gain output from the second range gain control unit. A second range offset control unit that creates a second range offset for each of the R, G, and B signals in accordance with the range gain offset; first range information for the first range signal level detection unit and the second range signal level The second range information for the detection unit, the first range gain and the first range gain offset output from the first range gain control unit, and the second range gain and the second range gain output from the second range gain control unit A two-detection-range-corresponding linear-change-gain creating unit that creates a two-detection-range-corresponding gain and a two-detection-range-corresponding gain offset for each of the R, G, and B signals in accordance with the offset; First range information, second range information for the second range signal level detection unit, and first range off output from the first range offset control unit A two-detection-range-corresponding linear-change offset creating unit that creates an offset corresponding to the two detection ranges for each of the R, G, and B signals according to the set and the second range offset output from the second range offset control unit; A decoding circuit for generating R, G, and B signals from the obtained luminance signal and color difference signal, according to the two detection range corresponding gain and the two detection range corresponding gain offset output from the two detection range corresponding linear change gain generation unit. R, output from the decoding circuit,
A contrast correction circuit for adjusting the contrast level of each of the G and B signals; R and G output by the contrast correction circuit in accordance with the two detection range corresponding offset signals output from the two detection range corresponding linear change offset control unit; , B offset adjustment circuit that adjusts the offset level of each signal, and performs gamma correction on each of the R, G, and B signals output from the offset correction circuit according to the voltage-transmittance characteristic of the liquid crystal panel unit. A gamma correction circuit, a polarity inversion amplifier circuit that performs AC driving and amplifies signals for each of the R, G, and B signals output from the gamma correction circuit, and a timing required for display in a circuit in the liquid crystal panel unit A liquid crystal display device comprising: a timing generation circuit that outputs a signal. 8. The signal level detection unit calculates a maximum value and a minimum value obtained by performing an averaging of an input signal and a filter process for suppressing a high frequency range in an arbitrary screen area based on detection range information. The liquid crystal display device according to any one of claims 1, 2, 3, 4, 5, and 6, wherein the liquid crystal display device is configured to be created. 9. The first range signal level detection unit according to claim 1, wherein
Addition and averaging of an input signal for an arbitrary screen area in the center of the screen based on the range information, and creating a maximum value and a minimum value that have been subjected to a filtering process for suppressing high frequencies, and generating the second range signal The level detection unit creates the maximum value and the minimum value obtained by performing the averaging of the input signal and the filtering process for suppressing the high frequency with respect to an arbitrary screen area around the screen based on the second range information. The liquid crystal display device according to claim 7, wherein the liquid crystal display device is configured as described above. 10. The differential data between a gain offset corresponding to an average signal level output from the signal level detection unit and a maximum signal level and a minimum signal level output from the signal level detection unit, The liquid crystal display device according to any one of claims 1, 2, 3, 4, 5, and 6, wherein the liquid crystal display device is configured to output a gain according to: 11. The first range gain control section, wherein the first range gain offset corresponding to a first range average signal level output from the first range signal level detection section and the first range signal level detection section are provided. And outputs a first range gain corresponding to difference data between the first range maximum signal level and the first range minimum signal level output from the second range gain control unit, and the second range gain control unit outputs the first range gain from the second range signal level detection unit. A second range gain offset corresponding to the output second range average signal level, and a difference data between the second range maximum signal level and the second range minimum signal level output from the second range signal level detection unit. The liquid crystal display device according to claim 7, wherein the liquid crystal display device is configured to output the second range gain. 12. The gain control unit according to claim 1, wherein the offset control unit is configured to obtain a maximum signal level and a minimum signal level output from the signal level detection unit and a gain offset and gain output from the gain control unit. An offset is set so that the maximum signal level and the minimum signal level are arranged at equal positions around the intermediate signal level, and the offset is shifted according to the average signal level output from the signal level detection unit. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is configured. 13. The gain calculation processing obtained by the illuminance offset control unit based on a maximum signal level and a minimum signal level output from the signal level detection unit and a gain offset and gain output from the gain control unit. The maximum signal level and the minimum signal level after the offset are set so that they are arranged at equal positions around the intermediate signal level, and the illuminance output from the illuminance detection unit, and the illuminance output from the signal level detection unit. 4. The liquid crystal display device according to claim 3, wherein the offset is shifted in accordance with the average signal level. 14. The gain control section according to claim 1, wherein said illuminance correction value control section calculates a gain signal obtained from a maximum signal level and a minimum signal level output from said signal level detection section, and a gain offset and gain output from said gain control section. The maximum signal level and the minimum signal level after the processing are set to be offset so that they are arranged at equal positions around the intermediate signal level, and the illuminance output from the illuminance detection unit,
And shifting the offset according to the average signal level output from the signal level detection unit, and additionally correcting the value output from the gain control unit according to the shift amount by suppressing or expanding the gain. The liquid crystal display device according to claim 4, wherein the liquid crystal display device is configured to output as a gain. 15. The linear change gain creating section,
A predetermined width is formed at a boundary portion outside the detection range and the detection range for the signal level detection unit, and in a detection range excluding the predetermined width, a gain offset output from the gain control unit is output as a linear change gain offset, Outside the detection range excluding the predetermined width, a predetermined gain offset set for the outside of the detection range is output as a linear change gain offset, and the gain offset output from the gain control unit and the outside of the detection range are output within the predetermined width range. A linearly changed value is output as a linear change gain offset between a predetermined gain offset and a predetermined gain offset set for the above, and the gain output from the gain control unit is linearly changed in a detection range excluding the predetermined width. Output as a gain, and outside the detection range excluding the predetermined width, a predetermined gain set for outside the detection range is directly applied. Output as a change gain, and a value obtained by linearly changing between the gain output from the gain control unit and a predetermined gain set for out of the detection range in the range of the predetermined width as a linear change gain. The liquid crystal display device according to claim 5, wherein the liquid crystal display device is configured to output. 16. The linear variation offset creation section, wherein a predetermined width is formed at a boundary between the detection range for the signal level detection section and the outside of the detection range, and output from the offset control section in a detection range other than the predetermined width. Is output as a linear change offset, outside the detection range excluding the predetermined width, outputs a predetermined offset set for the outside of the detection range as a linear change offset, and within the predetermined width range, the offset control unit outputs 6. The liquid crystal according to claim 5, wherein a value obtained by linearly changing between the output offset and a predetermined offset set outside the detection range is output as a linear change offset. Display device. 17. The curve change gain creating section,
A predetermined width is formed at a boundary portion outside the detection range and the detection range for the signal level detection unit, and a gain offset output from the gain control unit is output as a curve change gain offset in a detection range excluding the predetermined width, Outside the detection range excluding the predetermined width, a predetermined gain offset set for the outside of the detection range is output as a curve change gain offset, and the gain offset output from the gain control unit and the outside of the detection range are output within the predetermined width range. A curve-changed value is output as a curve-changed gain offset using a gain-curve ROM between a predetermined gain offset set for the above-mentioned gain control ROM and the gain control unit is output in a detection range excluding the predetermined width. Is output as a curve change gain, and outside the detection range except for the predetermined width is outside the detection range. The set predetermined gain is output as a curve change gain. In the range of the predetermined width, the gain between the gain output from the gain control unit and the predetermined gain set outside the detection range is set as a gain curve ROM. 7. The liquid crystal display device according to claim 6, wherein a value that is changed in a curved line by using is output as a curve changing gain. 18. The curve change offset creating section, wherein a predetermined width is formed at a boundary between the detection range for the signal level detection section and the outside of the detection range, and output from the offset control section in a detection range other than the predetermined width. The offset is output as a curve change offset, outside the detection range excluding the predetermined width, a predetermined offset set for the outside of the detection range is output as a curve change offset, and in the range of the predetermined width, the offset control unit outputs A configuration in which a value obtained by changing a curve between the output offset and a predetermined offset set outside the detection range using an offset curve ROM is output as a curve change offset. The liquid crystal display device according to claim 6, wherein 19. The first range offset control unit includes a first range maximum signal level and a first range minimum signal level output from the first range signal level detection unit, and an output from the first range gain control unit. An offset is set so that the maximum signal level and the minimum signal level after the gain calculation processing obtained by the obtained first range gain offset and the first range gain are arranged at equal positions around the intermediate signal level, and A value obtained by shifting the offset according to the first range average signal level output from the first range signal level detection unit is output as a first range offset, and the second range offset control unit outputs the second range offset signal. A second range maximum signal level and a second range minimum signal level output from the signal level detection unit; and a second range gain control unit. An offset is set so that the maximum signal level and the minimum signal level after the gain calculation processing obtained by the obtained second range gain offset and the second range gain are arranged at equal positions around the intermediate signal level; 8. The apparatus according to claim 7, wherein a value obtained by shifting said offset according to a second range average signal level output from said second range signal level detection unit is output as a second range offset. Liquid crystal display. 20. The two-detection-range-corresponding linear-change-gain creating section provides a predetermined width at a boundary between a detection range for the first range signal level detection section and a detection range for the second range signal level detection section, In the detection range based on the first range information excluding the predetermined width, the first range gain offset output from the first range gain controller is output as a gain offset corresponding to two detection ranges, and the detection based on the second range information excluding the predetermined width is performed. In the range, the second range gain offset output from the second range gain controller is output as a gain offset corresponding to two detection ranges, and in the predetermined width range, the first range gain output from the first range gain controller is output. The value obtained by linearly changing the offset between the offset and the second range gain offset output from the second range gain controller is two detection ranges. The first range gain output from the first range gain control unit is output as the two detection range corresponding gains in the detection range according to the first range information excluding the predetermined width, excluding the predetermined width. In the detection range according to the second range information, the second range gain output from the second range gain control unit is output as a gain corresponding to two detection ranges, and in the range of the predetermined width, the first range gain is output.
A configuration in which a value obtained by linearly changing between the first range gain output from the range gain control unit and the second range gain output from the second range gain control unit is output as a gain corresponding to the two detection ranges. 8. The method according to claim 7, wherein
The liquid crystal display device according to the above. 21. The two-detection-range-corresponding linear-change offset creating section provides a predetermined width at a boundary between a detection range for the first range signal level detection section and a detection range for the second range signal level detection section, In the detection range based on the first range information excluding the predetermined width, the first range offset output from the first range offset control unit is output as an offset corresponding to two detection ranges, and in the detection range based on the second range information excluding the predetermined width. The second range offset output from the second range offset control unit is output as an offset corresponding to two detection ranges. In the range of the predetermined width, the first range offset output from the first range offset control unit and the second range offset are output. A value obtained by linearly changing a value between the second range offset output from the range offset control unit and the second range offset is referred to as a 2 detection range corresponding offset. The liquid crystal display device according to claim 7, wherein the liquid crystal display device is configured to output the data. 22. The contrast circuit, wherein the input gain offset or a value corresponding thereto is used as a fixed point during contrast adjustment, and the input gain or a value corresponding thereto is used as an amplification gain during contrast adjustment. Claim 1, 2, 3, 4, 5, 6, or 7
The liquid crystal display device according to claim 1. 23. The liquid crystal display device according to claim 3, wherein the liquid crystal panel unit is configured by a reflection type liquid crystal panel that performs display using external light.