WO2005050295A1 - 液晶表示装置、液晶表示制御方法、並びに、そのプログラムおよび記録媒体 - Google Patents
液晶表示装置、液晶表示制御方法、並びに、そのプログラムおよび記録媒体 Download PDFInfo
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- WO2005050295A1 WO2005050295A1 PCT/JP2004/005099 JP2004005099W WO2005050295A1 WO 2005050295 A1 WO2005050295 A1 WO 2005050295A1 JP 2004005099 W JP2004005099 W JP 2004005099W WO 2005050295 A1 WO2005050295 A1 WO 2005050295A1
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- liquid crystal
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- crystal display
- input image
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0229—De-interlacing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/18—Use of a frame buffer in a display terminal, inclusive of the display panel
Definitions
- the present invention relates to a liquid crystal display device that displays an image using a liquid crystal display panel, and more particularly to a liquid crystal display device capable of improving the optical response characteristics of a liquid crystal display panel.
- LCDs liquid crystal display devices
- Moving images have been spreading to other fields, such as liquid crystal display devices used as TVs, from those that mainly use still images.
- LCDs are becoming thinner than TVs equipped with a cathode ray tube (CRT), and can be installed without taking up much space. .
- CTR cathode ray tube
- a plurality of scanning lines formed on a first substrate and a plurality of signal lines formed on a second substrate are arranged in a lattice, and further, a difference between the first and second substrates is provided.
- Liquid crystal having isotropic dielectric constant is sealed, and light transmitted through the first and second substrates by adjusting the intensity of an electric field according to image data applied to a portion where each scanning line and a signal line intersect. By adjusting the amount of A desired image is displayed.
- a TFT which is a non-linear element (switching element) arranged near the intersection of each scanning line and each signal line. (Th in Film Trans is tor) is the mainstream.
- LCDs are widely used not only as display devices for computers, but also as display devices for television receivers, the need to implement moving images has increased.
- the conventional LCD has a disadvantage that it is difficult to realize a moving image because of its slow response speed.
- the gradation of the input image data of the current frame predetermined according to the combination of the input image data of one frame before and the input image data of the current frame is determined.
- a liquid crystal driving method for supplying a driving voltage higher (overshoot) or lower (undershot) than a voltage to a liquid crystal display panel is known (for example, see Japanese Patent Application Laid-Open No. No. 504).
- this driving method is defined as overshoot (OS) driving, and it is known that the response speed of the liquid crystal has a very large temperature dependency, and the temperature of the liquid crystal display panel is very high.
- a liquid crystal panel driving device that constantly controls the response speed of the gradation change to an optimum state without deteriorating the display quality even when the image quality changes is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-318185. It is described in No. 16 gazette.
- FIG. 15 shows the main structure of a conventional liquid crystal display device.
- Figure 16 is an explanatory diagram showing an example of the contents of the OS table memory
- Figure 17 is a functional block diagram showing the schematic configuration of the control CPU
- Figure 18 is the temperature
- FIG. 19 is an explanatory diagram showing the relationship between the reference table memory
- FIG. 19 is a diagram showing the relationship between the voltage applied to the liquid crystal and the response of the liquid crystal.
- 1a to 1d are OS tables that store OS parameters (enhancement conversion parameters) corresponding to gradation transitions before and after one frame period of input image data, corresponding to each temperature in the device.
- Memory R ⁇ M
- 15 is frame memory (FM) that stores one frame of input image data
- 14 H is input image data of the Mth frame to be displayed (Current Data). Is compared with the input image data (Previous Data) of the M_ 1st frame stored in the frame memory 15 and the OS parameter corresponding to the comparison result (gradation transition) is stored in the OS table memory.
- Reference numeral 16 denotes a liquid crystal controller that outputs a liquid crystal drive signal to the gate driver 18 and the source driver 19 of the liquid crystal display panel 17 based on the emphasized conversion data from the emphasis conversion unit 14H.
- 20 is a temperature sensor for detecting the temperature inside the device
- 12 H is an OS table memory (R OM) 1 a to: L d according to the temperature inside the device detected by the temperature sensor 20.
- the lamellas LEVEL 1 to LEVEL 4 each have a reference temperature T 1 T2, T3, D4 ( ⁇ 1 ⁇ 2 ⁇ 3 ⁇ 4), obtained in advance from the actual measured values of the optical response characteristics of the liquid crystal display panel 17
- the degree is in the relationship of LEVEL 1> LEVEL 2> LEVEL 3> LEVEL 4.
- the number of display signal levels, that is, the number of display data is 8 bits.
- ⁇ S table memory (R OM) la ⁇ : Id may have OS parameters (measured values) for all 256 gradations. As shown in Fig. 6, only the 9X9 OS parameters (measured values) for the 9 representative tones for every 32 tones are stored, and the emphasis conversion data for the other tones is By using a configuration such as linear interpolation from the measured values, the storage capacity of the OS table memory (ROM) can be reduced.
- the control CPU 12 H converts the temperature detection data from the temperature sensor 20 into predetermined threshold temperature data values Th 1: Th 2 and Th 3.
- the OS table memory (R OM) la ⁇ : Id is selected according to the threshold discrimination unit 12a to be compared and the comparison result by the threshold discrimination unit 12a, and the OS parameter LEVEL 1 And a control signal output section 12b for generating and outputting a switching control signal for switching between LEVELLEVEL 4 and ⁇ 4.
- the control CPU 12H instructs the emphasis conversion section 14H to select and reference the ⁇ S table memory (ROM) 1c.
- the emphasis conversion unit 14H performs an emphasis conversion process on the input image data using the OS parameter LEVEL3 stored in the OS table memory (ROM) Ic.
- the control CPU 12 H sends an OS table to the emphasis conversion unit 14 H. Instruct the user to select and reference the memory (ROM) Id. Accordingly, the emphasis conversion unit 14H performs the emphasis conversion processing of the input image data by using the OS parameter LEVEL4 stored in the OS table memory (ROM) 1d.
- the time required to change from one halftone to another halftone is long, and the ability to follow an input signal at a low temperature becomes extremely poor, and the response time increases.
- the gradation of the input image data is set so that the liquid crystal display panel 17 reaches the target gradation luminance determined by the input image data after a predetermined one frame display period has elapsed.
- a general liquid crystal display device displays an image by progressive scanning.
- input image data is an interlaced video signal
- this is It must be converted to a progressive video signal (I / P conversion) and then supplied to the LCD panel.
- I / P conversion processing for example, as shown in FIG. 20, data interpolation is performed on each of the even field and the odd field of the interlaced signal, and each of the even field and the odd field is converted into the data shown in FIG. As shown in the figure, the process is to make each frame worth of image data.
- the present invention when an interlaced video signal is subjected to IZP conversion processing, a change between frames (a false signal) that is not present in the original image occurs, and this is further emphasized by overshoot driving, and the image quality is degraded. It is an object of the present invention to provide a liquid crystal display device capable of suppressing the occurrence of inconvenience.
- a liquid crystal display device enhances image data supplied to a liquid crystal display panel based on image data at least one vertical period ago and image data of a current vertical period.
- a liquid crystal display device for compensating optical response characteristics of the liquid crystal display panel, wherein signal type detection means for detecting a signal type of whether the input image data is a progressive signal or an interlaced signal; When the input image data is an interlace signal, an IZP conversion unit for converting the interlace signal into image data of a progressive signal, and the liquid crystal display panel determines the image data within a predetermined period (pixel rewriting period).
- An enhancement conversion unit that performs enhancement conversion of the image data so that transmittance is obtained.
- the degree of enhancement conversion of the image data in the enhancement conversion means is variably controlled in accordance with a detection result by the signal type detection means.
- the vertical period corresponds to the period of one frame (one frame). For example, the entire image of one frame (one frame) of the image data is written and scanned over one frame period of the image data. In this case, one vertical period is equal to one vertical display period. Further, the enhancement conversion of the image data is performed in pixel units.
- the liquid crystal display device includes a table memory storing an enhancement conversion parameter specified from the image data of the current vertical period and the image data of the previous vertical period, and the enhancement conversion unit includes the enhancement conversion unit.
- the coefficient in the multiplying unit may be smaller when the input image data is an interlace signal than when the input image data is a progressive signal. It is characterized by being set.
- the liquid crystal display device wherein the input image data is referred to when the input image data is a progressive signal, and a table storing enhancement conversion parameters designated from image data of a current vertical period and image data of one vertical period before.
- a memory, and a table memory which is referred to when the input image data is an interlaced signal and is specified from the image data of the current vertical period and the image data of one vertical period before, and stores an enhancement conversion parameter,
- the conversion means according to a detection result by the signal type detection means,
- the image processing apparatus is characterized in that the image processing apparatus further includes an arithmetic unit that performs an enhancement operation on the image data using the enhancement conversion parameter read from the table memory.
- the emphasis conversion parameter may be read out when the input image data is an interlace signal, as compared with a case where the input image data is a progressive signal. It is characterized by a small value.
- the liquid crystal display device further includes a temperature detection unit that detects an internal temperature of the device, and the enhancement conversion unit determines an enhancement conversion degree for the image data based on a detection result by the temperature detection unit. It is characterized by being variable.
- the liquid crystal display device includes a table memory storing an enhancement conversion parameter specified from the image data of the current vertical period and the image data of one vertical period before, wherein the enhancement conversion unit includes the enhancement conversion unit.
- An arithmetic unit for performing an enhancement operation on the image data using a conversion parameter; and an output data of the arithmetic unit according to a detection result by the signal type detection unit and a detection result by the temperature detection unit.
- a multiplication unit for multiplying different coefficients.
- the liquid crystal display device is a liquid crystal display device, which refers to a case where the input image data is a progressive signal, and stores a table in which enhancement conversion parameters specified from image data of a current vertical period and image data of one vertical period before are stored.
- the emphasis conversion unit according to a detection result by the signal type detection unit, An arithmetic unit for performing an enhancement operation on the image data using the enhancement conversion parameter read from the table memory, and a difference depending on a detection result of the temperature detection unit with respect to output data of the operation unit And a multiplication unit for multiplying the coefficient.
- the liquid crystal display device wherein the input image data is referred to when the input image data is a progressive signal. And a table memory in which parameters for the enhancement conversion specified by the following are stored: and an image of the current vertical period corresponding to each of a plurality of internal temperatures, which is referred to when the input image data is an interlace signal. And a table memory storing an emphasis conversion parameter designated from the data and the image data one vertical period earlier, wherein the emphasis conversion means detects the detection result of the signal type detection means and the detection of the temperature detection means.
- an arithmetic unit for performing an enhancement operation on the image data by using the enhancement conversion parameter read from the table memory. Sign.
- the liquid crystal display device includes a table memory in which an enhancement conversion parameter specified from the image data of the current vertical period and the image data of one vertical period before is stored corresponding to each of a plurality of temperatures in the device.
- the enhancement conversion means comprises: an enhancement conversion parameter read from the table memory according to a comparison result between a switching temperature determined by a detection result by the signal type detection means and a detection result by the temperature detection means. And an operation unit for performing an emphasis operation on the image data by using the image data.
- the liquid crystal display device includes a control unit that controls selection of switching of the emphasis conversion parameter, and the control unit includes a control unit that controls the temperature detection unit.
- the liquid crystal display device includes control means for controlling selection of switching of the emphasis conversion parameter, wherein the control means comprises: temperature data detected by the temperature detection means; and a signal of the input image data.
- a threshold discriminating unit for comparing predetermined threshold temperature data determined for each type with a control signal output unit for generating a switching control signal for controlling switching of the emphasis conversion parameter in accordance with a comparison result by the threshold discriminating unit And characterized in that:
- the liquid crystal display control method according to the present invention provides a method for controlling image data at least one vertical period earlier.
- the liquid crystal display control method comprises: Referring to a table memory storing an enhancement conversion parameter designated from the image data before the period, and performing an enhancement operation on the image data using the enhancement conversion parameter; and Multiplying the output data obtained by the calculation by a different coefficient according to the detection result of the signal type.
- an enhancement conversion parameter designated from the image data of the current vertical period and the image data of one vertical period before is stored.
- the stored table memory and storing an enhancement conversion parameter designated from the image data of the current vertical period and the image data of one vertical period before to be referred to when the input image data is an interlace signal.
- the obtained table memory and performing an enhancement operation on the image data using the enhancement conversion parameter read from the table memory in accordance with the detection result of the signal type.
- a liquid crystal display control method includes a step of detecting an internal temperature of a device, and a step of varying a degree of enhancement conversion with respect to the image data based on the detection result of the internal temperature of the device. .
- the liquid crystal display control method includes a step of referring to a table memory storing an enhancement conversion parameter specified from the image data of the current vertical period and the image data of one vertical period before.
- the input image data may be A step of referring to a table memory in which an enhancement conversion parameter specified from the image data of the current vertical period and the image data of the previous vertical period is referred to when the input image data is a sieve signal; and A step of referring to a table memory storing an enhancement conversion parameter specified from the image data of the current vertical period and the image data of one vertical period before, which is referred to when the signal is a signal; and Performing an enhancement operation on the image data by using the enhancement conversion parameter read from the table memory in accordance with the detection result; and outputting the output data of the enhancement operation to the detection result of the temperature in the device. Multiplying different coefficients accordingly.
- the image data of the current vertical period and the image of one vertical period before are referred to when the input image data is a progressive signal, corresponding to each of a plurality of internal temperatures.
- the liquid crystal display control method provides a table in which enhancement conversion parameters specified from image data of a current period and image data of one vertical period before are stored corresponding to each of a plurality of temperatures in the apparatus. Referring to the memory An emphasis calculation is performed on the image data using the emphasis conversion parameter read from the table memory according to a comparison result between the switching temperature determined by the detection result of the signal type and the detection result of the internal temperature of the apparatus. And a step of performing the following.
- the liquid crystal display control method includes: a step of performing a predetermined operation determined for each signal type of the input image data on the temperature data as the detection result of the device internal temperature; Comparing the acquired temperature data with predetermined threshold temperature data, and generating a switching control signal for controlling switching of the emphasis conversion parameter in accordance with a result of the comparison. It is characterized by the following.
- the liquid crystal display control method includes: a step of comparing temperature data, which is a result of detecting the temperature in the device, with predetermined threshold temperature data determined for each signal type of the input image data; Generating a switching control signal for switching and controlling the enhancement conversion parameter in accordance with the result of (1).
- the program according to the present invention includes an I / P converter for converting the interlaced signal into image data of a progressive signal, and at least one image before the vertical period.
- the image data to be supplied to the liquid crystal display panel based on the data and the image data in the current vertical period is converted into the image data so that the liquid crystal display panel has a transmittance determined by the image data within a predetermined period.
- the signal type detection means detects the signal type of the input image data as a progressive signal or an interlace signal, and when the input image data is an interlace signal, After the interlaced signal is converted into progressive signal image data by the P conversion means, the image data is enhanced by the enhancement conversion means.
- the degree of enhancement conversion for the image data in the enhancement conversion means is variably controlled in accordance with the detection result by the signal type detection means, and the enhancement conversion of the image data is performed as compared with the case where the input image data is a progressive signal. Because the degree is reduced, it is possible to prevent undesired changes between frames (false signals) that occur when interlaced video signals are converted to IZP, thereby preventing image quality from deteriorating. Can be.
- an undesired change (false signal) between frames that occurs when the interlaced video signal is subjected to the I / P conversion is emphasized by the over-shot driving.
- the over-shot driving it is possible to realize a high-quality image display in which the occurrence of flickering noise and jaggies in a contour portion or the like is suppressed.
- FIG. 1 is a diagram for explaining Embodiment 1 of the liquid crystal display device of the present invention.
- Fig. 2 shows the emphasis conversion data to be supplied to the LCD panel using the OS parameters obtained by referring to the OS table memory (ROM) in Fig. 1 and the multiplication coefficient given according to the input signal type. It is a figure for explaining a case.
- FIG. 9 is a diagram showing Embodiment 2 in the case where the device is provided.
- FIG. 4 shows an OS parameter obtained by adding a temperature sensor to the configuration of Fig. 1 and referring to the OS table memory (ROM), and a multiplication coefficient according to the signal type of input image data and the temperature inside the device.
- FIG. 13 is a diagram showing a third embodiment in which image data is used to perform an enhancement conversion process.
- FIG. 5 shows the OS table memory (R OM) in Fig. 4 when the input image data is a progressive signal, and the OS table memory (R OM) when the input image data is an interlaced signal.
- the OS table memory (R OM) that stores the OS parameters to be referenced is provided separately, and the degree of high-conversion to image data is varied using a multiplication coefficient according to the temperature inside the device.
- FIG. 14 is a diagram showing a fourth embodiment.
- FIG. 6 is a diagram for explaining a case in which enhanced conversion data is obtained by using an OS parameter obtained by referring to the OS table memory (R OM) of FIG. 5 and a multiplication coefficient corresponding to temperature detection data by a temperature sensor. It is.
- FIG. 13 is a diagram showing Embodiment 5 in a case where a configuration is provided in which an S table memory (R OM) in which data is stored is separately provided.
- R OM S table memory
- FIG. 8 is a diagram for explaining the details of the control CPU of FIG.
- FIG. 9 is a diagram for explaining an operation of switching and selecting the ⁇ S table memory (R OM) in FIG. 7 according to the signal type of the input image data and the temperature in the apparatus.
- FIG. 10 is a diagram showing Embodiment 6 in which the OS parameter is shared between a case where the input image data is a progressive signal and a case where the input image data is an interlace signal.
- FIG. 11 is a diagram showing details of the control CPU in FIG. 10.
- FIG. 12 is a diagram for explaining an operation of switching and selecting the OS table memory (R OM) of FIG. 10 according to the signal type of the input image data and the internal temperature of the apparatus.
- FIG. 13 is a diagram showing Embodiment 7 in which another configuration is provided as the control CPU of FIG. 10.
- FIG. 14 is a diagram illustrating Embodiment 8 in which only some OS parameters are shared between a case where the input image data is a progressive signal and a case where the input image data is an interlace signal.
- FIG. 15 is a diagram illustrating a configuration example of a conventional liquid crystal display device.
- FIG] 1 6 is a diagram showing an example of an OS parameter stored in the Figure 1 5 OS table memory (R OM).
- FIG. 17 is a diagram illustrating a configuration example of the control CPU in FIG.
- FIG. 18 is a diagram for explaining the operation of switching and selecting the OS table memory (ROM) in FIG. 15 according to the internal temperature of the apparatus.
- FIG. 19 is a diagram for explaining overshoot driving in the liquid crystal display device of FIG.
- FIG. 20 is a diagram for explaining a conventional I / P conversion process.
- FIG. 21 is a diagram for explaining that the outline position of the display image changes for each frame by the I / P conversion processing of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the input image data is subjected to the emphasis conversion processing by the above-described over-shot driving.
- the input image data is an interlaced signal
- the input image data is a progressive signal.
- the degree of enhancement conversion for image data is made smaller.
- the optical response characteristics of the liquid crystal display panel are compensated to suppress the occurrence of afterimages and tailing, while suppressing the emphasis of unwanted spurious signals at the contours generated during IP conversion. As a result, it is possible to display a high-quality image.
- FIG. 1 is a diagram for explaining Embodiment 1 of the liquid crystal display device of the present invention
- FIG. 2 is a diagram showing the OS parameters obtained by referring to the OS table memory (ROM) of FIG.
- ROM OS table memory
- FIG. 8 is a diagram for explaining a case where enhancement conversion data to be supplied to a display panel is obtained.
- the same parts as those in FIG. 15 are denoted by the same reference numerals.
- any one of reference numerals 14A to 14F is assigned to the emphasis conversion unit. I have.
- any one of the reference numerals 12A to 12G is assigned to each embodiment.
- the liquid crystal display device does not convert the input image data when the input image data is a progressive signal, and converts the input image data into a progressive signal when the input image data is an interlaced signal.
- the image data is subjected to an emphasis conversion process.
- the degree of the emphasis conversion for the image data subjected to the IZP conversion process is determined by a progressive signal from the input image data.
- the video signal type detection unit 10 serving as a signal type detection unit detects a signal type of whether the input image data is an interlace signal or a progressive signal. At that time, a detection method that counts the horizontal frequency and determines the signal format can be used.
- the IP conversion unit 11 as the I / P conversion means performs data interpolation on each of the even field and the odd field of the interlace signal, and performs the data interpolation on the even field and the odd field.
- each field is converted to one frame of image data.
- 3 A 0-frame-second (60-field second) interlaced video signal (in the case of the NTSC broadcasting system) is converted to a 60-frame Z-second pseudo-progressive video signal.
- control CPU 12 A As a control unit causes the IP conversion unit 11 to perform I / P conversion processing,
- the emphasis conversion process by the emphasis conversion unit 14A is controlled according to the signal type detected by the signal type detection unit 10.
- the emphasis conversion section 14A as the emphasis conversion means is controlled by the control CPU 12A to control the image data of the current frame to be displayed (image data of the current vertical period) and the frame memory 15A. Is compared with the image data of one frame before (image data of one vertical period before) stored in the OS table memory (ROM). ) Read from 13 and calculate the emphasis conversion data (write gradation data) required for displaying the image of the current frame to be displayed based on the read OS parameters, and output it to the LCD controller 16 I do.
- the input image data is a progressive signal
- unconverted image data is directly input to the emphasis conversion unit 14A, and when the input image data is an interlaced signal, the I / P conversion processing is performed.
- the subsequent image data is input.
- a liquid crystal is obtained by using an OS parameter obtained by referring to the OS table memory (ROM) 13 and a multiplication coefficient given according to a signal type of input image data.
- the enhanced conversion data to be supplied to the display panel 17 can be obtained. That is, the calculation unit 14 d
- the input image data of the Mth frame to be displayed (Current Data) is compared with the input image data of the Mth first frame (Previous Data) stored in the frame memory 15.
- An OS parameter corresponding to the comparison result (gradation transition) (that is, specified by the comparison result) is read from the OS table memory (ROM) 13 and subjected to an operation such as linear interpolation. Outputs the emphasis calculation data.
- the subtractor 14a subtracts the emphasized operation data from the image data of the current frame to obtain difference data, and the multiplier 14b controls the difference data to control the coefficient switching from the CPU 12A. Multiplied by the multiplication coefficient ⁇ ⁇ ⁇ or] 31 switched by the signal, the difference data multiplied by the multiplication coefficient by the adder 14c is added to the image data of the current frame, and the addition is performed.
- the obtained data is given to the LCD controller 16 as the emphasized conversion data. Thereby, the liquid crystal pixels are driven and displayed so as to have the transmittance determined by the input image data within a predetermined period.
- the predetermined period is a display period of one frame image (pixel rewriting cycle), and is one frame period in a normal hold type display (for example, 16 in a 60 Hz progressive scan). .7 msec).
- a normal hold type display for example, 16 in a 60 Hz progressive scan. .7 msec.
- the image display period is 12 frame periods (for example, 60 Hz). 8.3 msec for progressive scan).
- the OS table memory (ROM) 13 stores the OS parameters (measured values) for all 256 gradations. However, as shown in Fig. 16, for example, only 9 x 9 OS parameters (measured values) for 9 representative tones for every 32 tones are stored, and other tones are stored.
- the storage capacity of the OS table memory (ROM) 13 can be suppressed by configuring the emphasis conversion data to be obtained by an operation such as linear interpolation from the above measured values.
- the frame memory 15 can store image data of one frame, and stores image data of one frame before the current frame of image data to be displayed. I have.
- the liquid crystal controller 16 drives the gate driver 18 and the source driver 19 based on the emphasized conversion data from the emphasis conversion section 14A, and causes the liquid crystal display panel 17 to display an image.
- the liquid crystal display panel 17 has a TFT (Thin Film Transistor) which is the above-described non-linear element (switching element), and displays an image by driving a gate driver 18 and a source driver 19.
- TFT Thin Film Transistor
- the video signal type detection unit 10 detects a signal type of an interlace signal or a progressive signal. Upon detection, as described above, a detection method can be used in which the horizontal frequency of the input image data is weighted to determine the signal format.
- the video signal type detection unit 10 notifies the control CPU 12 A that the progressive signal has been detected.
- the I / P conversion processing by the I / P conversion unit 11 is not performed, and the input image data is directly input to the enhancement conversion unit 14A.
- the control CPU 12 A instructs the enhancement conversion section 14 A to perform an enhancement conversion process on the input image data.
- the input image data (Current Data) of the M-th frame to be displayed and the M-first frame stored in the frame memory 15 are calculated by the operation unit 14d as described above. Is compared with the input image data (Previous Data), and the OS parameter corresponding to the comparison result (gradation transition) is read from the OS table memory (ROM) 13 to obtain the emphasis calculation data.
- the emphasis calculation data is data that can reach the transmittance determined by the input image data of the Mth frame to be displayed by the liquid crystal display panel 17 within a predetermined period.
- the subtractor 14a obtains difference data between the emphasized operation data and the input image data of the Mth frame to be displayed.
- the subtractor 14a is output by the multiplier 14b. 4005099
- the liquid crystal controller 16 As the emphasized conversion data (therefore, in this case, the emphasized conversion data supplied to the liquid crystal display panel 17 is calculated by the arithmetic unit
- the liquid crystal pixels are displayed so as to have the transmittance determined by the input image data within a predetermined period when the input image data is a progressive signal. Since the liquid crystal display panel 17 is driven, the optical response characteristics of the liquid crystal display panel 17 are compensated, and a high-quality image display without an afterimage or tailing is performed.
- the control CPU 12 controls the I / N conversion unit 11 and the I ZP conversion unit 11 controls the interlace signal.
- the input image data is subjected to IZP conversion processing, converted into a pseudo-progressive signal, and then input to the emphasis conversion unit 14A.
- the control CPU 12A instructs the emphasis conversion section 14A to perform the emphasis conversion processing on the image data subjected to the IZP conversion processing.
- the input image data (Current Data) of the M-th frame to be displayed and the M-first frame stored in the frame memory 15 are calculated by the arithmetic unit 14d as described above.
- the input image data of the frame (Previous Data) is compared, and the OS parameter corresponding to the comparison result (gradation transition) is read out from the OS table memory (ROM) 13 and the emphasis calculation data is read. Is required.
- this emphasized calculation data is the input image data of the M-th frame to be displayed by the liquid crystal display panel 17 within a predetermined period. Data that can reach the transmittance determined by the data.
- the subtractor 14a obtains difference data between the emphasized operation data and the input image data of the Mth frame to be displayed.
- the multiplier 14b converts the difference data from the subtractor 14a.
- a multiplication coefficient i3 1 is multiplied (that is, the difference data is reduced and output), and the data multiplied by the adder 14 c and the input image data of the M-th frame to be displayed from now on are calculated.
- the added data is given to the liquid crystal controller 16 as the emphasis conversion data (therefore, in this case, the emphasis conversion data supplied to the liquid crystal display panel 17 is emphasized by the arithmetic unit 14 d The degree of emphasis conversion is smaller than the calculated data).
- the optical response characteristics of the liquid crystal display panel 17 are compensated to suppress the occurrence of afterimages and tailing, and undesired artifacts generated by the IZP conversion processing.
- High-quality image display is performed while suppressing image quality deterioration due to signal enhancement.
- the progressive signal is detected by the video signal type detection unit 10.
- the OS parameter corresponding to the comparison result (gradation transition) between the input image data of the current frame and the input image data of the previous frame by the emphasis conversion section 14A is stored in the OS table memory (ROM) 1. 3 and the enhanced arithmetic data obtained based on the read OS parameters is output to the LCD controller 16 as enhanced conversion data.
- Te can and by sea urchin display drive child as a transmittance specified by the input image data, it is possible to perform image display of an afterimage and trailing no high image quality.
- the emphasis conversion unit 14A compares the input image data of the current frame with the input image data of the previous frame. O corresponding to the comparison result (gradation transition)
- the S-parameters are read from the OS table memory (ROM) 13, the degree of the enhancement conversion is made smaller than the enhancement calculation data obtained based on the read OS parameters, and the LCD controller 1 is used as the enhancement conversion data. 6 to improve the response speed of the liquid crystal to suppress the occurrence of afterimages and tailing, and to improve the image quality due to false signals generated at the image contours when performing interlaced signal IZP conversion processing. Deterioration can be suppressed, and high-quality image display can be performed.
- FIG. 13 is a diagram showing Embodiment 2 in which an OS table memory (ROM) storing OS parameters used for image data enhancement conversion is separately provided.
- ROM OS table memory
- the OS table memory (ROM) 13a which is referred to when the input image data is a progressive signal, and the OS table memory which is referred to when the input image data is an interlace signal.
- OS table memory (ROM) 13a, 13 according to the signal type of the input image data detected by the video signal type detection unit 10. b. In the process.
- OS Te one Burumemori (R OM) 1 3 OS Nono 0 lame Ichita in b are, OS table memory (R OM) ⁇ S Bruno in 1 3 a,. It is smaller than the parameter. This is because, as described above, the input image data is an interlaced signal in order to suppress the false signal generated in the image outline when the interlaced signal is subjected to the I / P conversion processing so as to suppress the false signal. In this case, it is necessary to reduce the degree of enhancement conversion for the image data as compared with the case where the input image data is a progressive signal.
- each OS parameter is stored in the OS table memory (ROM) 13a, 13b provided separately, but different from the single OS table memory (ROM).
- Each OS parameter is stored in the table area, and the OS parameter is switched and selected by adaptively switching the table area to be referenced according to the switching control signal from the control CPU 12B. It may be configured to obtain the emphasized conversion data.
- the video signal type detection unit 10 detects, for example, a progressive signal
- the video signal type detection unit 10 detects, for example, a progressive signal
- the control CPU 12B is notified that a progressive signal has been detected.
- the I / P conversion unit 11 does not perform the I / P conversion processing, and the input image data is directly input to the enhancement conversion unit 14B.
- the enhancement conversion is performed by the control CPU 12B.
- An emphasis conversion process on the input image data is instructed to the emphasis conversion section 14B as a means.
- the emphasis conversion unit 14 B stores the input image data (Current Data) of the M-th frame to be displayed and the frame image memory 15 M- Comparison result with the input image data (Previous Data :) of the first frame
- OS table memory (R OM) 13 that refers to OS parameters corresponding to (gradation transition) (that is, specified by the comparison result) when the input image data is a progressive signal.
- the liquid crystal pixels are driven to display the transmittance determined by the input image data within a predetermined period, so that the liquid crystal display panel 17 has an optical response characteristic. , And a high-quality image display without afterimages or tailing is performed.
- the control CPU 12B controls the IZP conversion unit 11 and the I / P conversion unit 11 controls the interlace signal. I / P conversion processing is performed on the input image data of the signal, the signal is converted into a pseudo progressive signal, and then input to the emphasis conversion unit 14B.
- the control CPU 12B instructs the enhancement conversion section 14B to perform the enhancement conversion processing on the I / P-converted image data.
- the emphasis conversion section 14 B converts the input image data (Current Data) of the Mth frame to be displayed and the M-, 1st frame input image data stored in the frame memory 15.
- the OS parameters are read out from the OS table memory (ROM) 13b, which is referred to when the input image data is an interlaced signal, and operations such as linear interpolation are performed using the OS parameters to obtain a liquid crystal display.
- Enhancement conversion data to be output to controller 16 is required.
- the degree of the enhanced conversion data is higher than that of the enhanced conversion data obtained by referring to the OS table memory (ROM) 13a. It is getting smaller.
- the input image data is an interlaced signal
- it is generated by the I / P conversion process while compensating for the optical response characteristics of the liquid crystal display panel 17 and suppressing the occurrence of afterimages and tailing.
- high-quality image display is performed while suppressing image quality deterioration due to the emphasis of unwanted false signals.
- Fig. 4 shows that the temperature sensor is added to the configuration of Fig. 1 and the OS table memory (RO (M)
- RO (M) OS table memory
- the S table memory (ROM) 13 stores the OS parameters (enhancement conversion parameters) optimized when the input image data is a progressive signal, as described above.
- Multiplication coefficients ⁇ 1 to ⁇ 4 which will be described later, according to the signal type detection data by the video signal type detection unit 10 as the signal type detection unit and the temperature detection data by the temperature sensor 20 as the temperature detection unit, The enhancement conversion is performed on the input image data using ⁇ 1 to ⁇ 4.
- the OS table memory (ROM) 13 has the OS parameters (actual measurement) for all 256 gradations. However, as shown in Fig. 16, for example, only 9 X 9 OS parameters (measured values) for 9 representative tones for every 32 tones are stored. The storage capacity of the OS table memory (ROM) 13 can be suppressed by configuring so that the emphasis conversion data for the gray scale is obtained by an operation such as linear interpolation from the above measured values.
- the emphasis conversion unit 14 C of this embodiment is realized by the same configuration as that of FIG. 2.
- the OS parameters read from the OS table memory (ROM) 13, the signal type, and the liquid crystal display panel 17 Using the multiplication coefficients ⁇ 1 to ⁇ 4 and ⁇ 1 to] 34 depending on the temperature of the liquid crystal display panel, enhanced conversion data for compensating the optical response characteristics including the temperature-dependent characteristics of the liquid crystal display panel 17 are obtained, It can be output to the LCD controller 16.
- the input image data is progressive
- the multiplication coefficient for the input signal is ⁇ 1 to ⁇ 4.
- the multiplication coefficient is / 31 to! 3 4 However, 0 1 ⁇ ct l ⁇ 2 ⁇ a 2, ⁇ 3 ⁇ a 3 j 3 4, and ⁇ 4.
- the temperature detection data from the temperature sensor 20 is, for example, 15 ° C or less, more than 15 ° C, 25 ° C or less, more than 25 ° C, 35 ° C or less, 35 ° C.
- the multiplication factor is 1 (> ⁇ 2), Multiplying factor ⁇ 2 (> ⁇ 3) when the value is larger than 15 and less than 25, and the coefficient multiplying factor 3 (> ⁇ > when the value is greater than 25 ° C and less than 35 ° C.
- the value is larger than 35, a description will be given of the case where the multiplication factor is 3/4 ( ⁇ 1). No.
- these multiplication coefficients ⁇ 1 to ⁇ 4::! To / 34 are obtained in advance from the actually measured values of the optical response characteristics of the liquid crystal display panel 17.
- the image data can be emphasized and transformed with a smaller degree of emphasis conversion than in the case of a progressive signal.
- Compensating the optical response characteristics (including temperature-dependent characteristics) of the liquid crystal display panel 17 while suppressing image quality degradation due to the emphasis of various false signals, Display can be performed.
- the temperature sensor 20 be provided in the liquid crystal display panel 17 for its original purpose, but since this is structurally difficult, the temperature sensor 20 should be installed as close as possible to the liquid crystal display panel 17. Just fine.
- the number of the temperature sensors 20 is not limited to one, but may be plural, and may be arranged corresponding to each part of the liquid crystal display panel 17. When a plurality of temperature sensors 20 are provided, a value obtained by averaging the detection results from the respective temperature sensors 20 may be used as temperature detection data, or any of the temperature sensors 20 May be used as temperature detection data.
- the video signal type detection unit 10 detects, for example, a progressive signal
- the video signal type detection unit 10 detects the progressive signal to the control CPU 12C. You will be notified. In this case, the I / P conversion processing by the I / P conversion unit 11 is not performed, and the input image data is directly input to the enhancement conversion unit 14C.
- control CPU 12 C controls the emphasis conversion section as emphasis conversion means.
- the 14 C is instructed to perform an enhancement conversion process on the input image data.
- the input image data (Current Data) of the M-th frame to be displayed and the M-first frame stored in the frame memory 15 are calculated by the arithmetic unit 14d.
- Is compared with the input image data (Previous Data), and the OS parameter corresponding to the comparison result (gradation transition) (that is, specified by the comparison result) is stored in the OS table memory.
- the subtractor 14a calculates difference data between the emphasized operation data and the input image data of the Mth frame to be displayed.
- the temperature detection data from the temperature sensor 20 is taken into the control CPU 12C, and the control CPU 12C selects any one of the multiplication coefficients ⁇ 1 to ⁇ 4 according to the temperature detection data. Is selected.
- the multiplication factor is 1 (> a2)
- the multiplication factor is 2
- the multiplier 14b applies any one of the multiplication coefficients to the difference data.
- the multiplication coefficients ⁇ 1 to 4 are multiplied, and the adder 1
- the data multiplied by 4c and the input image data of the ⁇ th frame to be displayed are added, and the added data is given to the liquid crystal controller 16 as the emphasis conversion data.
- the input image data is a progressive signal
- the optical response characteristics (including temperature-dependent characteristics) of the liquid crystal display panel 17 are compensated even if the temperature of the liquid crystal display panel 17 changes. A high-quality image display without afterimages or tailing is performed.
- the control CPU 12 C controls the ⁇ ⁇ ⁇ conversion unit 11, and the I / ⁇ conversion unit 11
- the input / output conversion processing is performed on the input image data of the interlaced signal, and the input image data is converted into a pseudo progressive signal, which is then input to the emphasis conversion unit 14C.
- the control CPU 12C instructs the emphasis conversion unit 14C to perform an emphasis conversion process on the image data that has been subjected to the I ⁇ D conversion process.
- the input image data (Current Data) of the M-th frame to be displayed and the M-first data stored in the frame memory 15 are calculated by the arithmetic unit 14d.
- the input image data (Previous Data) of the frame is compared, and the OS parameter corresponding to the comparison result (gradation transition) (that is, specified by the comparison result) is stored in the OS table memory (R OM) 13 is read out to obtain the emphasis calculation data.
- the subtractor 14a calculates difference data between the emphasized operation data and the input image data of the M-th frame to be displayed.
- the temperature detection data from the temperature sensor 20 is taken into the control CPU 12C, and the control CPU 12C calculates a multiplication coefficient 31 to] 34 according to the temperature detection data. Either one is selected for switching.
- the multiplication coefficient ⁇ 1 > ⁇ 2
- the multiplication coefficient i3 2 > ⁇ 3
- the multiplication factor is i3 3 (> j3 4) . If the temperature is higher than 35 ° C, the multiplication factor is] 3 4 ( 1).
- the multiplier 14b switches any one of the difference data. Multiplied by 1 to] 34, and the data multiplied by the adder 14c and the input image data of the Mth frame to be displayed from now on are added, and the added data is subjected to an emphasis conversion.
- the data is given to the liquid crystal controller 16 as data.
- the liquid crystal display panel 17 Even if the temperature of 17 changes, the optical response characteristics (including temperature-dependent characteristics) of the liquid crystal display panel 17 are compensated to suppress the occurrence of afterimages and tailing, and the I / O conversion process generates The image quality deterioration due to the emphasis on the unwanted false signal is suppressed, and a high-quality image display is performed.
- the degree of enhancement conversion for image data is variably controlled, so that appropriate enhancement conversion processing can be applied to image data according to the signal type of input image data and the temperature inside the device. This makes it possible to display high-quality images.
- Fig. 5 refers to the OS table memory (R OM) in Fig. 4 when the input image data is a progressive signal.
- OS table memory (R OM) storing OS parameters used for image data enhancement conversion.
- an OS table memory (ROM) storing OS parameters used for high-conversion of the image data, which is referred to when the input image data is an interlace signal.
- FIG. 4 shows Embodiment 4 in which the degree of enhancement conversion for image data is varied using a multiplication coefficient according to the internal temperature.
- FIG. 6 shows OS parameters obtained by referring to the OS table memory (R OM) in FIG.
- FIG. 7 is a diagram for explaining a case where enhanced conversion data is obtained using a multiplication coefficient corresponding to temperature detection data obtained by a temperature sensor.
- the OS table memory (ROM) 13a which is referred to when the input image data is a progressive signal
- An OS table memory (R OM) 13b which is referred to when the image data is an interlace signal
- an OS table memory (R OM) according to the detected progressive signal or interlace signal.
- the emphasis conversion for the input image data is performed using the multiplication coefficients ⁇ 1 to ⁇ 4 described later according to the temperature detection data from the temperature sensor 20. I am trying to do it.
- the OS parameter in the OS table memory (ROM) 13b is smaller than the OS parameter in the OS table memory (ROM) 13a. This is because, as described above, the flicker noise (false signal) or the like generated at the outline of the display image is emphasized by the emphasis conversion on the image data after the IP conversion processing, so that the input image is suppressed. This is because, when the data is an interlace signal, the degree of enhancement conversion for the image data needs to be smaller than that when the input image data is a progressive signal.
- each OS parameter is stored in an individually provided OS table memory (ROM) 13a, 13b, and is stored in a single OS table memory (ROM).
- OS parameters are stored in different table areas, and the OS parameters are switched and selected by adaptively switching the table area to be referenced according to the switching control signal from the control CPU 12D. Then, the emphasis conversion data may be obtained.
- the OS table memories (ROM) 13a and 13b have all the 256 gradations. May have OS parameters (actual values) for For example, as shown in Fig. 16, only the 9 X 9 OS parameters (measured values) of .9 representative tones for every 32 tones are stored, and the emphasis conversion data for the other tones is However, the configuration in which the actual measured value is obtained by an operation such as linear interpolation can suppress the storage capacity of the OS table memory (ROM) 13.
- the emphasis conversion section 14 D of the present embodiment is realized by the same configuration as that of FIG. 2. Read out from one of the OS table memories (ROM) 13 a and 13 b according to the input signal type. Using the obtained ⁇ S parameter and the multiplication coefficient ⁇ 1 to ⁇ 4 according to the temperature of the liquid crystal display panel 17 to compensate for the optical response characteristics including the temperature-dependent characteristics of the liquid crystal display panel 17. The enhanced conversion data can be obtained and output to the liquid crystal controller 16.
- the temperature detection data from the temperature sensor 20 is, for example, 15 ° C or less, more than 15 ° C, 25 ° C or less, more than 25 ° C, 35 ° C or less, Divided into four temperature ranges when the temperature is higher than ° C.
- the multiplication coefficients ⁇ 1 to ⁇ 4 are obtained in advance from the actually measured values of the optical response characteristics of the liquid crystal display panel 17.
- the image data can be emphasized and converted with a smaller degree of emphasis conversion than when the progressive signal is used.
- the optical response characteristics (including temperature-dependent characteristics) of the liquid crystal display panel 17 are compensated for while suppressing image degradation due to the emphasis of unwanted spurious signals generated by the P-conversion process. High-quality image display without tailing is performed.
- the temperature sensor 20 be provided in the liquid crystal display panel 17 for its original purpose, but since this is structurally difficult, the temperature sensor 20 should be installed as close as possible to the liquid crystal display panel 17. Just fine.
- the number of the temperature sensors 20 is not limited to one, but may be plural, and may be arranged corresponding to each part of the liquid crystal display panel 17. When a plurality of temperature sensors 20 are provided, a value obtained by averaging the detection results from the respective temperature sensors 20 may be used as temperature detection data, or any of the temperature sensors 20 May be used as the temperature detection data.
- the progressive signal is detected from the video signal type detection unit 10 to the control CPU 12D. You will be notified. In this case, the IZP conversion processing by the I / P conversion unit 11 is not performed, and the input image data is directly input to the enhancement conversion unit 14D.
- the control CPU 12D instructs the emphasis conversion section 14D as the emphasis conversion means to perform an emphasis conversion process on the input image data.
- an instruction to refer to the OS table memory (ROM) 13a is given by a parameter switching control signal from the control CPU 12D.
- the arithmetic unit 14d calculates the input image data (Current Data) of the Mth frame to be displayed and the input image data (M—1st frame) of the Mth frame stored in the frame memory 15 Prev ious Data)
- the OS parameter corresponding to the comparison result (gradation transition) of is read from the OS table memory (ROM) 13a to obtain the emphasis calculation data.
- the subtractor 14a obtains difference data between the emphasized operation data and the input image data of the Mth frame to be displayed.
- the temperature detection data from the temperature sensor 20 is taken into the control CPU 12D, and the control CPU 12D calculates the multiplication coefficient l to ct4 according to the temperature detection data.
- a coefficient switching control signal for switching and selecting any one is given to the emphasis conversion section 14D.
- the multiplication coefficient ⁇ 1 > ⁇ 2
- the multiplication coefficient ct2 3
- becomes a multiplication coefficient ⁇ 3 > ⁇ 4 when the temperature is more than 25 ° C and 35 ° C or less
- the difference data is output by the multiplier 14b. Is multiplied by one of the multiplication coefficients 1 to ⁇ 4, and the data multiplied by the adder 14c and the input image data of the ⁇ th frame to be displayed are added, and the sum is added.
- the input data is supplied to the LCD controller 16 as the emphasized conversion data. If the input image data is a progressive signal, the liquid crystal display is displayed even if the temperature of the liquid crystal display panel 17 changes. The optical response characteristics (including temperature-dependent characteristics) of panel 17 are compensated for, and a high-quality image display without afterimages or tailing is performed.
- the video signal type detection unit 10 When detected, the I / P converter 11 is controlled by the control CPU 12D, and the IZP conversion processing is performed on the input image data of the interlaced signal to convert it into a pseudo progressive signal. Is input to the emphasis conversion section 14D.
- control CPU 12D causes the emphasis conversion unit 14D to
- An enhancement conversion process is instructed for the 1 / P converted image data.
- it is instructed to refer to the OS table memory (ROM) 13b by the parameter switching control signal from the control CPU 12D.
- the operation unit 14 d calculates the input image data (Current Data) of the Mth frame to be displayed and the input image of the Mth first frame stored in the frame memory 15.
- the OS parameter corresponding to the comparison result (gradation transition) with the data (Previous Data) (that is, specified by the comparison result) is read from the OS table memory (ROM) 13b.
- the subtractor 14a obtains difference data between the emphasized operation data and the input image data of the Mth frame to be displayed.
- the temperature detection data from the temperature sensor 20 is taken into the control CPU 12D, and any one of the multiplication coefficients ⁇ 1 to ⁇ 4 according to the temperature detection data is received from the control CPU 12D.
- a coefficient switching control signal for switching and selecting is supplied to the emphasis conversion section 14D.
- the multiplication coefficient ⁇ 3 (> ⁇ 4) is obtained.
- a multiplier 14b adds the difference data to the difference data. Any one of the multiplication coefficients 1 to ⁇ 4 is multiplied, and the multiplied data is added by the adder 14c to the input image data of the ⁇ ⁇ ⁇ ⁇ th frame to be displayed, and the added data is added.
- the data is given to the liquid crystal controller 16 as the emphasized conversion data.
- the OS table memory (ROM) 13b in the OS table memory 13b since the value of the radiator is smaller than the OS parameter in the OS table memory (ROM) 13a, the optical response characteristics of the liquid crystal display panel 17 (temperature (Including dependent characteristics) to suppress image lag and tailing while suppressing image degradation due to the enhancement of unwanted spurious signals generated by the IZP conversion process.
- Image display is performed (in this way, in the fourth embodiment, the OS table memory (ROM) 13a referred to when the input image data is a progressive signal and the input image data is an interlace signal) OS table memory (ROM) 13b to be referred to in the case, and any one of the OS table memory (ROM) 13a and 13b according to the detected progressive signal or interlace signal.
- OS parameter read from the degree of enhancement conversion for the input image data is variably controlled using the multiplication coefficients ⁇ 1 to ⁇ 4 according to the temperature detection data from the temperature sensor 20. Appropriate enhancement conversion processing according to the type and the internal temperature of the apparatus can be performed on image data, and high-quality image display can be performed. (Embodiment 5)
- FIG. 7 shows an OS table memory (R OM) that stores OS parameters corresponding to each of a plurality of temperature ranges, which is referred to when the input image data is a progressive signal, and the input image data is an interlaced signal.
- FIG. 10 is a diagram showing a fifth embodiment in which an OS table memory (R OM) storing OS parameters corresponding to each of a plurality of temperature ranges is separately provided. 8 is a diagram for explaining the details of the control CPU in FIG. 7, and FIG. 9 is an operation for switching and selecting the OS table memory (ROM) in FIG. 7 according to the signal type of the input image data and the temperature in the device. It is a figure for explanation.
- the OS table memory (ROM) 13 1 to 13 4 to be referred to when the input image data is a progressive signal, the OS table memory (ROM) 13 1 to 13 4 to be referred to, and the input image data is an interlace signal.
- An OS table memory (ROM) 135 to be referred to in a certain case is provided. Then, a signal type of whether the input image data is an interlace signal or a progressive signal is detected, and according to the signal type and the temperature inside the device obtained from the temperature detection data from the temperature sensor 20,
- the OS table memory (ROM) 13 It refers to switching any one of! To 13 8 to perform the emphasis conversion processing on the image data.
- the OS table memory (ROM) 1335 to 1338 is referred to when the input image data is a progressive signal.
- the OS table memory (ROM) 13 1 to: 1 3 4 The value is smaller than the OS parameter inside. As described above, this corresponds to the image data after the I / P conversion processing. If the input image data is an interlaced signal, the input image data must be input to prevent the flicker noise (false signal) generated at the outline of the display image from being emphasized by the emphasis conversion. This is because it is necessary to make the degree of enhancement conversion for image data smaller than when the data is a progressive signal.
- each OS parameter is stored in the OS table memory (ROM) 13 1 to 13 8 provided separately, but the OS parameter is stored in a single OS table memory (R OM).
- Each OS parameter is stored in a different table area, and the OS parameter is switched and selected by adaptively switching the table area to be referenced according to the switching control signal from the control CPU 12E. Alternatively, the emphasis conversion data may be obtained.
- the OS table memory (ROM) 13 1 to 13 OS parameters may be used for the tones, but for example, as shown in Figure 16, 9 x 9 OS parameters (measured values) for 9 representative tones for every 32 tones OS table memory (ROM) 13 1-: 1 3 by storing only the data and emphasizing conversion data for the other gradations from the actual measurement values by calculation such as linear interpolation. 8 storage capacity can be suppressed.
- the temperature sensor 20 be provided in the liquid crystal display panel 17 for its original purpose, but since this is structurally difficult, it is desirable to install the temperature sensor 20 as close as possible to the liquid crystal display panel 17.
- the number of temperature sensors 20 is not limited to one, but may be plural, corresponding to each part of the liquid crystal display panel 17. You may make it arrange
- a value obtained by averaging the detection results from each of the temperature sensors 20 may be used as the temperature detection data, or any of the temperature sensors 2 having a large change may be used.
- the detection result from 0 may be used as the temperature detection data.
- each of the OS table memories (ROMs) 1311 to 1338 is switched and referenced according to the temperature detection data from the temperature sensor 20.
- the temperature inside the device is 15 ° C or less, more than 15 ° C and 25 ° C or less, more than 25 ° C and 35 ° C or less, and more than 35 ° C
- Each OS table memory (ROM) 13 1 to: 13 8 is provided to correspond to the four temperature ranges of the above, but it corresponds to the temperature range of 3 or less or 5 or more Needless to say, even if the prepared OS parameters are prepared.
- FIG. 8 shows the configuration of the control CPU 12E which instructs the selection of switching between the OS table memories (ROM) 13 1 to 13 according to the temperature detection data of the temperature sensor 20 as shown in FIG. explain. That is, the control CPU 12 E as the control means has the threshold value discriminating unit 12 a and the control signal output unit 12 c.
- the threshold value discriminating unit 12a Upon receiving the temperature detection data from the temperature sensor 20, the threshold value discriminating unit 12a compares, for example, predetermined switching temperatures (threshold temperatures) T hl, Th 2, and Th 3 which are predetermined.
- the switching temperatures (threshold temperatures) Th1, Th2, and Th3 are, for example, 15 ° C, 25 ° C, and 35 ° C, and the temperature inside the device is 15 ° C or less.
- a force is output if the force is greater than 15 ° C and less than 25 ° C, and if the force is greater than 25 ° C and less than 35 ° C or greater than 35 ° C.
- the control signal output unit 12c responds to the detection result of the signal type of either the interlaced signal or the progressive signal by the video signal type detection unit 10 and the determination result by the threshold value determination unit 12a.
- a switching control signal is output. That is, when the detection result of the signal type from the video signal type detection unit 10 and the determination result by the threshold value determination unit 12a are received, the OS table memory is used in accordance with the signal type and the temperature detection data. (R OM)
- the switching control signal indicates which of 13 1 to 13 8 is to be referred.
- the control signal output section 12 c outputs identification data of, for example, “0” when the input image data is a progressive signal and “1 j” when the input image data is an interlaced signal.
- ⁇ 0 0 '' when the data is below 15 ° C ⁇ 0 1 '' when it is higher than 15 ° C and below 25 ° C
- the temperature is higher than 35 ° C
- 8 OS table memories (R OM) 13 1 By combining with the identification data of “1 1”, 8 OS table memories (R OM) 13 1 to It is possible to instruct whether to perform the enhancement conversion of the image data by referring to any one of the items 13-8.
- the video signal type detection unit 10 detects, for example, a progressive signal
- the video signal type detection unit 10 detects the progressive signal to the control CPU 12E. You will be notified. In this case, the IZP conversion processing by the I / P conversion unit 11 is not performed, and the input image data is directly input to the enhancement conversion unit 14E.
- the control CPU 12E instructs the emphasis conversion unit 14E as an emphasis conversion unit to perform an emphasis conversion process on the input image data.
- the temperature detection data from the threshold value discriminating unit 12a is 15 ° C or less.
- Switching control signal for selecting and indicating one of S table memory (R OM) 13 1 to 13 4 Is output.
- the OS table memory (ROM) 1331 is instructed to be referred to, and is larger than 15 ° C. If the temperature is below 5 ° C, the user is instructed to refer to the OS table memory (R OM) 1 32. ) Instructed to refer to 133 and if it is greater than 35 ° C, instructed to refer to OS Table Memory (ROM) 1 34.
- the emphasis conversion unit 14E Upon receiving the instruction, the emphasis conversion unit 14E outputs the M-th frame of input image data (Current Data) to be displayed and the M-first data stored in the frame memory 15
- the OS parameter corresponding to the comparison result (gradation transition) of the frame with the input image data (Previous Data) is the OS parameter designated by the selection instruction.
- the read-out data is read out from one of the blue memory (ROM) 13 1 to 13 4, and the enhanced conversion data is obtained based on the read-out OS parameter, and given to the liquid crystal controller 16.
- the input image data is a progressive signal, the optical response characteristics (including temperature-dependent characteristics) of the liquid crystal display panel 17 are compensated even if the temperature of the liquid crystal display panel 17 changes. , High-quality image display without afterimages and tailing is performed.
- the control CPU 12E controls the IZP converter 11 to perform an IZP conversion process on the input image data of the interlaced signal and convert the interlaced signal into a pseudo progressive signal. Is input to the emphasis conversion section 14E.
- the temperature detection data from the threshold value discriminating unit 12a is higher than 15 ° C or lower and higher than 15 ° C and lower than 25 ° C or lower. If the input image data is an interlaced signal, the control signal output unit 12c determines whether the input image data is greater than 35 ° C. OS table memory to be referenced (ROM) A switching control signal for selecting and instructing any one of 135 to 1338 is output.
- the temperature detection data from the temperature sensor 20 is, for example, 15 ° C or less
- an instruction is provided to refer to the OS table memory (ROM) 135, which is larger than 15 ° C. If below 25 ° C, it is instructed to refer to OS Table Memory (R OM) 1 36, and if it is greater than 25 but below 3 5, OS Table Memory (R OM) It is instructed to refer to 13 7 and if it is greater than 35 ° C, it is instructed to refer to OS Table Memory (ROM) 1 38.
- the emphasis conversion unit 14E outputs the M-th frame of input image data (Current Data) to be displayed and the M_l-th frame stored in the frame memory 15
- the OS parameter corresponding to the comparison result (gradation transition) of the frame with the input image data (Previous Data) is the OS table memory specified and indicated by the selection. (R OM) is read from any of 135 to 138, and enhanced conversion data is obtained based on the read OS parameter. Controller 16.
- the OS table memory (ROM) 135 when the input image data is an interlaced signal, as described above, the OS table memory (ROM) 135 :: The OS No. 0 parameter in the 138 corresponds to the corresponding OS data.
- a plurality of OS table memories (ROMs) 13 1 to 13 4 according to the temperature detection data from the temperature sensor 20 are referred to when the input image data is a progressive signal.
- a plurality of OS table memories (ROMs) 135 to 138 according to the temperature detection data from the temperature sensor 20 which are referred to when the input image data is an interlace signal.
- OS table memory (R) according to the signal type of the input image data, whether it is an interlace signal or a progressive signal, and the temperature inside the device obtained by the temperature detection data from the temperature sensor 20.
- OM) 1 3 Enhance conversion for image data is performed by switching and referencing any of! To 1 38, so that appropriate enhancement conversion processing corresponding to the input signal type and the temperature inside the device is performed. Apply to This enables high-quality image display.
- Figure ⁇ 0 shows a case where the OS parameters are shared between the case where the input image data is a progressive signal and the case where the input image data is an interlace signal.
- Fig. 11 shows the details of the control CPU in Fig. 10.
- Fig. 12 shows the OS table memory (ROM) in Fig. 10 according to the signal type of the input image data and the temperature inside the device.
- FIG. 9 is a diagram for explaining an operation of switching and selecting.
- the input image data is a progressive signal among the OS table memories (ROM) 13 1 to 13 8 shown in FIG.
- the four ⁇ S table memories (ROMs) 13 1 to 13 4 to be referred to can be referenced even when the input image data is an interlaced signal, and the signal type and The OS table memory (ROM) 13 1 to 13 4 is switched and referenced according to the internal temperature of the device by the temperature sensor 20 and the emphasis conversion process is performed on the image data. .
- control CPU 12 F that performs switching control of the OS table memory (ROM) 13 1 to 13 4 to be referred to according to the signal type of the input image data and the detection data of the temperature in the apparatus is
- the control CPU 12 F includes a threshold discriminator 12 a, a control signal output unit 12 b, a signal type arithmetic expression storage unit 12 e, and an arithmetic unit 12. f.
- the threshold value discriminating unit 12a compares the temperature data calculated by the calculating unit 12f with predetermined switching temperatures (threshold temperatures) T hl, Th 2, and Th 3 determined in advance. I do.
- Th1, Th2, and Th3 are, for example, 15 ° C, 25 ° C, and 35 ° C.
- the control signal output unit 12 b is connected to the emphasis conversion unit 14 F as an emphasis conversion unit according to the comparison result by the threshold value discrimination unit 12 a, and any OS table memory (R OM) 13 1 A switching control signal for instructing whether or not to select 1 to 3 4 is generated.
- the signal type arithmetic expression storage section 1 2 e stores a decision for each signal type of the input image data.
- An arithmetic expression such as adding or subtracting the obtained predetermined value to the temperature detection data obtained by the temperature sensor 20 is stored.
- the arithmetic unit 12 f calculates the temperature using the arithmetic expression read from the signal type arithmetic expression storage unit 12 e according to the signal type data detected by the video signal type detection unit 10. Correction calculation is performed on the temperature detection data by the sensor 20.
- the control CPU 12F instructs the emphasis conversion section 14F to select and refer to the OS table memory (ROM) 1331.
- the emphasis conversion unit 14F performs the emphasis conversion processing of the input image data by using the OS parameter stored in the OS table memory (ROM) 1331.
- the control CPU 1 2 F instructs the emphasis conversion section 14 F to select and refer to the OS table memory (ROM) 13 2.
- the emphasis conversion section 14F performs the emphasis conversion processing of the input image data using the OS parameters stored in the OS table memory (ROM) 132.
- the arithmetic unit 12 f uses the arithmetic expression read from the signal type arithmetic expression storage unit 12 e to calculate the temperature detection data by the temperature sensor 20. After performing a predetermined calculation (here, for example, adding 5 ° C), the signal is output to the threshold value discriminating unit 12a.
- the addition is not limited to 5 ° C., and may be 4 ° C. or less or 6 ° C. or more, and may be arbitrarily set according to the optical response characteristics of the liquid crystal display panel 17.
- the control CPU 12 F sends a signal to the emphasis conversion unit 14 F. Instruct the user to select and refer to the OS table memory (ROM) 1 3 1. As a result, the emphasis conversion section 14 F stores the OS information stored in the OS table memory (R OM) 13 1. The input image data is subjected to enhancement conversion processing using the parameters. If the temperature inside the device detected by the temperature sensor 20 is higher than 10 ° C and lower than 20 ° C, the control CPU 12F sends an OS table to the emphasis conversion section 14F. Instruct the user to select and refer to the memory (ROM) 1 32. Thus, the emphasis conversion unit 14F performs the high-conversion processing of the input image data by using the OS parameters stored in the OS table memory (ROM) 132.
- the control CPU 12F sends the enhancement conversion section 14F to the OS. Instructs the user to select and refer to the table memory (ROM).
- the emphasis conversion unit 14F performs the high-conversion processing of the input image data using the OS parameters stored in the OS table memory (ROM) 133.
- the control CPU 12 F sends the OS table memory (R OM) 13 to the emphasis conversion unit 14 F. Instruct 4 to select and browse.
- the emphasis conversion unit 14F performs the emphasis conversion process on the input image data using the OS parameters stored in the OS table memory (ROM) 134.
- the temperature is compared with predetermined switching temperatures Th 1, Th 2, and Th 3, Generates a switching control signal for switching OS parameters. That is, when the input image data is a progressive signal and when the input image data is an interlaced signal, the OS table memory (ROM) 13 to be referred to is switched and selected. The switching temperature (in-device temperature) is changed as needed, so the OS table memory (R OM) 13:! ⁇ 1 3 4 is shared for input image data of any signal type. This makes it possible to perform an emphasis conversion process, and it is possible to suppress the storage capacity of the memory as compared with a case where an OS table memory (R OM) is separately provided for each signal type of input image data.
- the image data is obtained by using an OS parameter having a smaller value than the OS parameter used when the input image data is a progressive signal.
- OS parameter having a smaller value than the OS parameter used when the input image data is a progressive signal.
- a plurality of oS parameters corresponding to each temperature range are stored in OS table memories (ROM) 13 1 to 13 4 provided individually, but a single OS table memory is used. (ROM) are stored in different table areas, and the OS parameters are switched and selected by adaptively switching the table area to be referenced according to the switching control signal from the control CPU 12F. Needless to say, it may be configured to obtain the emphasized conversion data.
- OS table memories ROM 13 1 to 13 4 provided individually, but a single OS table memory is used.
- ROM OS table memories
- the OS parameters are switched and selected by adaptively switching the table area to be referenced according to the switching control signal from the control CPU 12F. Needless to say, it may be configured to obtain the emphasized conversion data.
- the OS table memory (ROM) 13 1 to 13 4 May have OS parameters (actual values), but as shown in Fig. 16, for example, 9 X—> 9 OS parameters (actual values ) Is stored, and the emphasis conversion data for the other gradations is obtained from the above measured values by calculation such as linear interpolation. With this configuration, it is possible to reduce the storage capacity of the S table memory (ROM) 13 1 to 13 4.
- FIG. 13 is a diagram showing a seventh embodiment in which another configuration is provided as the control CPU of FIG. 10.
- the control CPU 12 G includes a signal type threshold in which data of a predetermined switching temperature (threshold temperature) determined for each signal type of input image data is stored.
- the switching data Th 1, Th 2, and Th 3 read from the signal type threshold temperature data storage 12 i according to the signal type of the input image data and the temperature data storage 1 2 i.
- a threshold discriminator 12 j for comparing the temperature detection data from the temperature sensor 20 with the OS table memory (R OM) for the emphasis converter 14 F according to the comparison result by the threshold discriminator 12 j.
- a control signal output section 12b for generating a switching control signal for selecting any one of 13 1 to 13 4 for reference.
- the control CPU 12 G instructs the emphasis conversion section 14 F to select and refer to the OS table memory (R OM) 13 1, whereby the emphasis conversion section 14 F uses the OS table memory (R OM) 1) Using the OS parameters stored in 31, the input image data is enhanced and converted.
- the control is performed.
- the CPU 12G provides the ⁇ S table memory (RO M) Instruct to select 1 3 2 and refer to it. Accordingly, the emphasis conversion unit 14F performs the emphasis conversion processing of the input image data using the OS parameters stored in the OS table memory (ROM) 132.
- control is performed.
- the CPU 12G instructs the emphasis conversion section 14F to select and reference the ⁇ ⁇ ⁇ ⁇ S table memory (ROM) 133.
- the emphasis conversion unit 14F performs the emphasis conversion processing of the input image data using the OS parameters stored in the OS table memory (ROM) 133.
- the temperature inside the device detected by the temperature sensor 20 is the switching temperature T h
- the control CPU 12 G instructs the emphasis conversion section 14 F to select and refer to the OS table memory (ROM) 134.
- the emphasis conversion unit 14F performs the emphasis conversion process on the input image data using the OS parameters stored in the OS table memory (ROM) 134.
- the threshold value discrimination unit 12 j reads out from the signal type threshold temperature data storage unit 12 i.
- T h '1 ( ⁇ T h 1)
- T h' 2 ( ⁇ T h 2)
- T h '3 ( ⁇ T h 3)
- the control CPU 1 .2 G instructs the emphasis conversion section 14 F to select and refer to the OS table memory (ROM) 13 1.
- the emphasis conversion unit 14F performs an emphasis conversion process on the input image data by using the ⁇ S parameter stored in the OS table memory (ROM) 1331 (5).
- the control CPU 12 G sends the OS table memory (ROM) to the emphasis conversion section 14 F. Select 1 3 2 and instruct them to browse.
- the emphasis conversion section 14F performs the emphasis conversion processing of the input image data by using the OS parameters stored in the OS table memory (ROM) 132.
- the control CPU 12G instructs the emphasis conversion section 14F to select and refer to the OS table memory (ROM) '133.
- the emphasis conversion section 14F performs the emphasis conversion processing of the input image data using the OS parameters stored in the OS table memory (ROM) 133.
- the control CPU 12 G sends the OS table memory to the emphasis conversion section 14 F. (R OM) Select 1 3 4 and instruct to refer to it The Accordingly, the emphasis conversion unit 14F performs the high-conversion processing of the input image data using the OS parameters stored in the OS table memory (ROM) 134.
- the comparison and determination of the temperature detection data by the temperature sensor 20 are performed using the switching temperature (threshold temperature) determined for each signal type of the input image data.
- a switching control signal for selecting an OS table memory (ROM) 134 to be referred to is generated.
- the OS table memory (ROM) 13 to be referred to is switched from one to another at a switching temperature (device). (Internal temperature) as appropriate, so that the input image data of any signal type can be subjected to the emphasis conversion process by sharing the OS table memory (ROM) 13 1 to 1 3 4. It is possible to reduce the memory storage capacity compared to the case where OS table memory (ROM) is separately provided for each signal type of input image data.
- the image data is obtained by using an OS parameter having a smaller value than the OS parameter used when the input image data is a progressive signal. This makes it possible to emphasize the false signal such as flicker noise and jaggies that occur in the image outline when performing the I / P conversion process on the interlaced signal, resulting in deterioration of the image quality. Can be suppressed.
- FIG. 9 is a diagram showing a state 8.
- the OS table memory (R OM) that is commonly referred to when the input image data is a progressive signal or an interlaced signal is used.
- OS table memory (R OM) 13a to be referenced when the input image data is a progressive signal, and reference when the input image data is an interface signal OS table memory (R OM) 13 b is provided, and these OS table memories (R OM) 13 a to 13 e are switched and referenced according to the switching temperature determined for each input signal type.
- the data is configured to perform emphasis conversion.
- the respective OS table memories (R OM) 13a and 13b store OS parameters used for enhancing conversion of image data when the temperature is higher than room temperature, for example.
- the control CPU 1 described in FIG. 11 (or FIG. 13) is used. It can be performed by the switching control signal from 2F (or 12G).
- the control CPU 12 F Instruct F to select and refer to OS table memory (ROM) 13 c.
- the emphasis conversion section 14F performs the emphasis conversion processing of the input image data using the OS parameters stored in the OS table memory (ROM) 13c.
- the control CPU 12F instructs the emphasizing conversion unit 14F to select and reference the ⁇ S table memory (ROM) 13d.
- the emphasis conversion unit 14F performs the high-conversion processing of the input image data using the OS parameters stored in the OS table memory (ROM) 13d.
- the control CPU 12 F controls the emphasis conversion unit 14 F.
- the emphasis conversion unit 14F performs the high-conversion processing of the input image data by using the OS parameters stored in the OS table memory (ROM) 13e.
- the control CPU 12 F sends the OS table memory (R OM) 1 3 Instruct the user to select a for reference. Accordingly, the emphasis conversion unit 14F performs the emphasis conversion process on the input image data using the OS parameters stored in the OS table memory (ROM) 13a.
- the control CPU 12 F Instruct F to select and refer to OS table memory (ROM) 13c. Accordingly, the emphasis conversion unit 14F performs the emphasis conversion processing of the input image data by using the OS parameters stored in the OS table memory (ROM) 13c.
- the control CPU 12 F instructs the emphasis conversion unit 14 F to select and refer to the OS table memory (ROM) 13 d. Accordingly, the emphasis conversion unit 14F performs the high-conversion process of the input image data using the OS parameters stored in the ⁇ S table memory (ROM) 13d.
- the control CPU 12F sends the enhancement conversion section 14F to the OS. Instruct the user to select and refer to the table memory (ROM) 13 e.
- the emphasis conversion unit 14F performs the high-conversion process of the input image data using the OS parameter stored in the ⁇ S table memory (ROM) 13e.
- the control CPU 12 F sends the OS table memory (R OM) 13 to the emphasis conversion unit 14 F. Instruct the user to select b for reference. As a result, the emphasis conversion unit 14F performs an emphasis conversion process on the input image data using the OS parameters stored in the OS table memory (ROM) 13b.
- Dedicated OS table memory (ROM) 13 a for referencing when the image data is a progressive signal and dedicated S table memory (R OM) 13 b for referencing when the input image data is an interlaced signal
- the OS table memory (R OM) 13a to l3e is determined for each input signal type. Switching is performed according to the switching temperature (in-device temperature), and the image data is emphasized and converted. Therefore, the OS table memory (ROM) 13c to 13e can be shared to perform appropriate emphasized conversion processing. Can be applied.
- a plurality of OS parameters corresponding to each signal type and each temperature range are stored in individually provided OS table memories (R OM) 13a to 13e. It is stored in a different table area of the table memory (ROM), and the table area to be referred to is adaptively switched according to the switching control signal from the control CPU 12F (or 12G). Therefore, it is also possible to switch and select the emphasis conversion parameter to obtain the emphasis conversion data.
- R OM OS table memories
- the OS table memories (ROM) 13a to 13e have all the 256 gradations.
- OS parameters actual measurement values
- 9 X 9 OS parameters actual measurement values
- the emphasis conversion data for the other gradations is obtained from the above measured values by calculation such as linear interpolation, so that the OS table memory (ROM) 13 a to 1 3
- the storage capacity of e can be suppressed.
- the entire image of one frame (one frame) of image data is written and run over one frame period of image data (for example, 16.7 msec).
- the liquid crystal display device adopts a driving method in which one vertical period (one frame period) coincides with one vertical display period
- the present invention is not limited to this.
- the period during which an image is displayed for one frame period (the image display period)
- the liquid crystal display device may employ a driving method in which the driving method is divided into a period (a period) and a period (a dark display period) in which a ⁇ display (for example, black display) is performed.
- the enhanced conversion data corresponding to the combination of the input image data of the previous frame and the input image data of the current frame is output to the liquid crystal controller 16.
- the emphasis conversion data is referred to. You may decide. In any case, the same effect can be obtained if the emphasis conversion data is determined with reference to the input image data at least one frame before.
- a frame memory with a larger storage capacity is required to determine the enhanced conversion data by referring to the earlier input image data. Therefore, when the storage capacity is required to be reduced, as in the above embodiments, the input image data of the previous frame and the input image data of the current frame are different from the input image data of each frame. It is desired to determine the emphasis conversion data with reference to only the data.
- the emphasized conversion data is output to the liquid crystal controller 16 with reference to the input image data one frame before, but the input data one frame before that actually input is output.
- the gradation level at which the pixels of the liquid crystal panel have actually reached is predicted, and the predicted value is calculated as the image data one frame before. It may be referred to as “Previous oda”. Note that even in this case, the input image data one frame before is referred to for predicting the reached gradation. In either case, the input image data at least one frame before The same effect can be obtained by determining the emphasis conversion data based on the data and the input image data of the current frame.
- the OS parameters stored in the emphasis conversion unit (14A to 14F) and the OS table memory (ROM 13 to 13e '13 1 to 13 8) are used.
- (Enhancement conversion parameter) has been described as an example of the case of performing the enhancement conversion, but the present invention is not limited to this.
- the enhancement conversion unit uses the input image data of the Mth frame (Current Data) and the input image data of the Mth frame (Previous Data) stored in the frame memory 15 as variables.
- the enhancement conversion data for compensating the optical response characteristics of the liquid crystal display panel (17) may be calculated by a function such as a two-dimensional function f (Current Data, Previous Data).
- the video signal type detection unit (10), the I / P conversion unit (11), the control CPU (12A to 12G), and the enhancement conversion unit (14A to 1G) 4 F) and the frame memory (15) are both hardware examples, but the calculation means such as a computer (CPU) is stored in a storage device (memory, etc.) not shown. These members may be realized by executing the same program and executing the same operation.
- the program is distributed by, for example, distributing a recording medium on which the program is recorded, or transmitting the program via various transmission paths such as a wired or wireless transmission path. Is executed.
- Any liquid crystal display device that displays images by progressive scan is sufficient, and is not limited to familiar devices such as personal computers and television receivers equipped with such a display device, but may also be used for measuring devices and medical devices. It can be applied to equipment and industrial equipment in general.
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Description
Claims
Priority Applications (2)
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EP04726649A EP1686413B1 (en) | 2003-11-20 | 2004-04-08 | Liquid crystal display device, liquid crystal display control method, program thereof, and recording medium |
US10/541,093 US7609243B2 (en) | 2003-11-20 | 2004-04-08 | Liquid crystal display device, liquid crystal display control method, program thereof, and recording medium |
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JP2003391376 | 2003-11-20 | ||
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JP2004079238A JP3579046B1 (ja) | 2003-11-20 | 2004-03-18 | 液晶表示装置、液晶表示制御方法、並びに、そのプログラムおよび記録媒体 |
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JP (1) | JP3579046B1 (ja) |
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Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3717917B2 (ja) | 2004-01-16 | 2005-11-16 | シャープ株式会社 | 液晶表示装置、液晶表示装置の信号処理装置、そのプログラムおよび記録媒体、並びに、液晶表示制御方法 |
JP2005236760A (ja) * | 2004-02-20 | 2005-09-02 | Sanyo Electric Co Ltd | ビデオ信号判別装置 |
US7924914B2 (en) | 2005-09-20 | 2011-04-12 | Intel Corporation | Dynamically configuring a video decoder cache for motion compensation |
JP2007127972A (ja) | 2005-11-07 | 2007-05-24 | Toshiba Corp | 画像表示調整装置 |
JP4728816B2 (ja) * | 2006-01-13 | 2011-07-20 | 東芝モバイルディスプレイ株式会社 | 表示装置及びその駆動方法及び端末装置 |
CN101501752B (zh) * | 2006-09-19 | 2012-03-21 | 夏普株式会社 | 液晶面板驱动装置、液晶面板驱动方法、液晶显示装置、车载用显示装置 |
JP2008191386A (ja) * | 2007-02-05 | 2008-08-21 | Seiko Epson Corp | 表示駆動装置、表示装置および電子機器 |
WO2008129886A1 (ja) * | 2007-04-16 | 2008-10-30 | Sharp Kabushiki Kaisha | 表示装置、表示装置の駆動装置、電子機器 |
CN101939778A (zh) * | 2008-03-07 | 2011-01-05 | 夏普株式会社 | 液晶显示装置、及液晶显示装置和驱动方法 |
US9478177B2 (en) * | 2010-12-28 | 2016-10-25 | Sharp Kabushiki Kaisha | Display device configured to perform pseudo interlace scanning image display based on progressive image signal, driving method thereof, and display driving circuit |
US11064247B1 (en) * | 2020-05-29 | 2021-07-13 | Elo Touch Solutions, Inc. | System and method for communicating non-standard video data via USB |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04288589A (ja) * | 1990-09-03 | 1992-10-13 | Toshiba Corp | 液晶表示装置 |
JPH0720828A (ja) * | 1993-06-30 | 1995-01-24 | Toshiba Corp | 液晶表示装置 |
JPH07121143A (ja) * | 1993-10-20 | 1995-05-12 | Casio Comput Co Ltd | 液晶表示装置及び液晶駆動方法 |
JP2001343625A (ja) * | 2000-03-31 | 2001-12-14 | Sharp Corp | 液晶表示装置 |
JP2003018500A (ja) * | 2001-04-27 | 2003-01-17 | Sharp Corp | 画像処理回路、画像表示装置、並びに画像処理方法 |
JP2003078856A (ja) * | 2001-09-04 | 2003-03-14 | Nec Corp | 映像サーバ・ディスプレイシステム |
JP2003143556A (ja) * | 2001-11-01 | 2003-05-16 | Hitachi Ltd | 表示装置 |
JP2003172915A (ja) * | 2001-09-26 | 2003-06-20 | Sharp Corp | 液晶表示装置 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3052418B2 (ja) | 1991-04-17 | 2000-06-12 | カシオ計算機株式会社 | 液晶パネル駆動装置 |
US5347294A (en) | 1991-04-17 | 1994-09-13 | Casio Computer Co., Ltd. | Image display apparatus |
JPH06165087A (ja) | 1992-11-18 | 1994-06-10 | Toshiba Corp | 液晶表示装置 |
JPH09247587A (ja) * | 1996-03-07 | 1997-09-19 | Sharp Corp | マトリクス型表示装置 |
JP2000181415A (ja) * | 1998-12-18 | 2000-06-30 | Matsushita Electric Ind Co Ltd | 液晶表示装置 |
JP2000241801A (ja) | 1999-02-23 | 2000-09-08 | Nippon Seiki Co Ltd | 液晶素子の駆動装置及び駆動方法 |
JP2001022314A (ja) * | 1999-07-02 | 2001-01-26 | Pioneer Electronic Corp | ディスプレイ装置 |
US6496177B1 (en) | 2000-02-24 | 2002-12-17 | Koninklijke Philips Electronics N.V. | Liquid crystal display (LCD) contrast control system and method |
JP2002108294A (ja) | 2000-09-28 | 2002-04-10 | Advanced Display Inc | 液晶表示装置 |
TW499664B (en) | 2000-10-31 | 2002-08-21 | Au Optronics Corp | Drive circuit of liquid crystal display panel and liquid crystal display |
JP2002207463A (ja) | 2000-11-13 | 2002-07-26 | Mitsubishi Electric Corp | 液晶表示装置 |
TW575864B (en) * | 2001-11-09 | 2004-02-11 | Sharp Kk | Liquid crystal display device |
TW200303001A (en) * | 2001-11-09 | 2003-08-16 | Sharp Kk | Liquid crystal display device |
JP4009174B2 (ja) | 2001-11-09 | 2007-11-14 | シャープ株式会社 | 液晶表示装置 |
KR100840316B1 (ko) * | 2001-11-26 | 2008-06-20 | 삼성전자주식회사 | 액정 표시 장치 및 그의 구동 방법 |
-
2004
- 2004-03-18 JP JP2004079238A patent/JP3579046B1/ja not_active Expired - Fee Related
- 2004-04-08 US US10/541,093 patent/US7609243B2/en not_active Expired - Fee Related
- 2004-04-08 CN CNB2004800059387A patent/CN100390617C/zh not_active Expired - Fee Related
- 2004-04-08 WO PCT/JP2004/005099 patent/WO2005050295A1/ja not_active Application Discontinuation
- 2004-04-08 EP EP04726649A patent/EP1686413B1/en not_active Expired - Fee Related
- 2004-04-08 KR KR1020067009765A patent/KR100815313B1/ko not_active IP Right Cessation
- 2004-06-25 TW TW093118678A patent/TWI263829B/zh not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04288589A (ja) * | 1990-09-03 | 1992-10-13 | Toshiba Corp | 液晶表示装置 |
JPH0720828A (ja) * | 1993-06-30 | 1995-01-24 | Toshiba Corp | 液晶表示装置 |
JPH07121143A (ja) * | 1993-10-20 | 1995-05-12 | Casio Comput Co Ltd | 液晶表示装置及び液晶駆動方法 |
JP2001343625A (ja) * | 2000-03-31 | 2001-12-14 | Sharp Corp | 液晶表示装置 |
JP2003018500A (ja) * | 2001-04-27 | 2003-01-17 | Sharp Corp | 画像処理回路、画像表示装置、並びに画像処理方法 |
JP2003078856A (ja) * | 2001-09-04 | 2003-03-14 | Nec Corp | 映像サーバ・ディスプレイシステム |
JP2003172915A (ja) * | 2001-09-26 | 2003-06-20 | Sharp Corp | 液晶表示装置 |
JP2003143556A (ja) * | 2001-11-01 | 2003-05-16 | Hitachi Ltd | 表示装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1686413A4 * |
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Publication number | Publication date |
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KR100815313B1 (ko) | 2008-03-19 |
CN100390617C (zh) | 2008-05-28 |
US20060176262A1 (en) | 2006-08-10 |
TW200517715A (en) | 2005-06-01 |
EP1686413A1 (en) | 2006-08-02 |
KR20060092266A (ko) | 2006-08-22 |
JP2005173525A (ja) | 2005-06-30 |
TWI263829B (en) | 2006-10-11 |
EP1686413A4 (en) | 2007-08-15 |
JP3579046B1 (ja) | 2004-10-20 |
CN1756987A (zh) | 2006-04-05 |
US7609243B2 (en) | 2009-10-27 |
EP1686413B1 (en) | 2011-06-15 |
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