CN1160863A - Color liquid crystal display device - Google Patents
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- CN1160863A CN1160863A CN 96104911 CN96104911A CN1160863A CN 1160863 A CN1160863 A CN 1160863A CN 96104911 CN96104911 CN 96104911 CN 96104911 A CN96104911 A CN 96104911A CN 1160863 A CN1160863 A CN 1160863A
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Abstract
彩色液晶显示装置，包括：一液晶显示元件，用于通过向夹在一对基板之间的一液晶层施加电压来控制该液晶层的双折射作用从而显示多种色彩；图象数据提供装置，用于提供限定欲被显示的色彩的图象数据；驱动控制装置，用于从包括一个由为该图象数据预设的n(正整数)个不同作用电压构成的第一组和一个为该图象数据预设的m(不同于n的正整数)个不同作用电压构成的第二组的多个组中选出一个，并将所选组中与该图象数据相关的作用电压施加到该液晶层上。
A color liquid crystal display device comprising: a liquid crystal display element for controlling the birefringence of a liquid crystal layer sandwiched between a pair of substrates by applying a voltage to display various colors; image data providing means, Used to provide image data that defines the color to be displayed; the drive control device is used to start from a first group consisting of n (positive integer) different action voltages preset for the image data and a set for the Select one of the multiple groups of the second group of m (a positive integer different from n) different applied voltages preset by the image data, and apply the applied voltage related to the image data in the selected group to on the liquid crystal layer.
Description
The present invention relates to a kind of color liquid crystal display arrangement that is used for showing different color according to the voltage that applies, more specifically, even a kind of color liquid crystal display arrangement that shows clearly that also can provide under high unit temp is provided.
Usually, liquid crystal indicator is known as the display device that is used for televisor, personal computer, spreadsheet calculations device etc.Recently, be extensive use of again can the display color color color liquid crystal display arrangement, for example be used for the color monitor of lcd tv, terminal etc.
As color liquid crystal display arrangement, used transmissive device widely, this device has the liquid crystal cells that is clipped between a pair of polarization plates and at this back of the body lamp (radiation source) to one of polarization plates outside.In this device, liquid crystal cells is by sealing liquid crystal being obtained between a pair of transparency carrier that is provided with relative to one another, being formed with transparency electrode on this apparent surface to transparency carrier.Being used for optionally seeing through the light color filter with specific wavelength is formed on the transparency carrier.
Be applied to this to the driving voltage between the transparency electrode on the transparency carrier, carry on the back the output Be Controlled of the light of lamp by energy/disconnected control from this.During from color filter in passing liquid crystal indicator of the light of this back of the body lamp by colour filter selectively, thereby make light be colored as specific color.The colored operation that shows utilization is undertaken by the painted transmitted light of color filter.
Because color filter generally has low transmissivity, in utilizing the color liquid crystal display arrangement of common color filter, can produce the big loss of transmitted light, thereby make that demonstration is dim.In addition, the reflection-type liquid-crystal display device that is often used as such as the display part of the pocket device of spreadsheet calculations device or wrist-watch etc. does not have special light source, as in this device color filter being set, light passes color filter twice in its front and back that are reflected, and the loss of light is bigger.Therefore, it shows that meeting is more dim.Therefore, utilize color filter to be difficult to provide colored display operation.
In addition, need high precision for color filter at aspects such as dimension (as thickness) and assemblings, as other optics such as polarization plates.This will increase the cost of liquid crystal indicator.
In addition, in utilizing the color liquid crystal display arrangement of color filter, owing to only be shown as the color of a color filter of this electrode setting corresponding to a pixel of an electrode, a display dot must be made of to show multicolour a plurality of pixels with a plurality of color filters, and wherein these a plurality of color filters have different colors.Therefore need many pixels to show multicolour.The result makes the structure of color liquid crystal display arrangement more complicated.Particularly when a multicolour display operation be utilize that dot matrix display type device with many display dot finishes the time, the structure of this display device is more complicated.
As a kind of color liquid crystal display arrangement that does not utilize color filter, the known color liquid crystal display arrangement that the birefringence controlling schemes is arranged.In this device, electric field is applied on the liquid crystal layer with the state of orientation that changes liquid crystal molecule or the order of direction, thereby shows a color image by the change that utilizes resultant birefringence effect.
In such liquid crystal indicator, even same voltage is applied on liquid crystal, the birefringence effect of this liquid crystal also can change along with the variation of liquid crystal temperature, thereby display color is changed.Like this, the demonstration mistake of the color shift of specifying color etc. will occur being different from, make the quality of demonstration destroyed such as display color.
In order to address this problem, a kind of compensation (adjusting) effect voltage is for example disclosed in Japanese patent application 6-105047 number (U.S. Patent application 08/422,982) to suppress the feature of display color with the technology of the variation of environment temperature and a kind of like this color liquid crystal display arrangement.
To preferably about 0 ℃ to 40 ℃ of the effect voltage temperature range that can compensate.Yet it is difficult that the temperature that exceeds this scope is compensated.Consequently, display quality and visual decline.
The purpose of this invention is to provide a kind of color liquid crystal display arrangement with simple structure, it can improve transmitance, the brightness that sufficiently improve to show, show multicolour, be not subjected to can to provide colored clearly such as the various liquid crystal drive condition effect of temperature etc. and show with a pixel by not using the painted transmitted light of color filter.
In order to achieve the above object, according to the present invention, a kind of color liquid crystal display arrangement is provided, it comprises: a liquid crystal display cells, be used for by applying the birefringence effect that a voltage is controlled this liquid crystal layer, thereby show multicolour to a liquid crystal layer that is clipped between a pair of substrate; The pictorial data generator is used to provide the pictorial data that is used for limiting the color of desiring to be shown; And driving control device, be used for selecting a group of at least two groups, this at least two group comprises that one is pressed first group of constituting and by individual for the default not same-action voltage formation of pictorial data second group of m (positive integers different with n) by n (positive integer) is individual for the default different effect of pictorial data, and the effect voltage relevant with pictorial data in selected group is applied to this liquid crystal layer gets on.
According to color liquid crystal display arrangement with said structure, according to drive condition of the performance that influences liquid crystal molecule etc., be added to from a plurality of preparations and select one group of suitable effect voltage the effect voltage group that the effect voltage on the liquid crystal layer constitutes, and the effect voltage corresponding to pictorial data is applied on this liquid crystal layer in this selecteed group by different numbers.Because this operation if the liquid crystal drive condition is normal, is used to then show that the effect voltage of the color that is limited by pictorial data is added to liquid crystal layer without any change ground, shows thereby obtain required multicolour.If liquid crystal drive condition etc. is improper, though then the colored display operation of counting and having to change the visuality that keeps necessary to carry out a colored display operation-the have color that is limited by pictorial data of display color can not be performed.
In above-mentioned color liquid crystal display arrangement, this driving control device preferably includes and is used for selecting one group of effect voltage of desiring to apply, should group effect voltage selecting corresponding to the effect voltage of pictorial data and will act on voltage to be applied to device on this liquid crystal layer from selected according to the condition of the performance of the liquid crystal molecule that influences this liquid crystal display.
This drive unit can comprise the performance that is used to detect the liquid crystal molecule that influences this liquid crystal display condition variation and export the pick-up unit of a change signal, and be used for receiving this change signal, select one group of effect voltage of desiring to be applied in, organize selected effect voltage selection from this and also will act on voltage corresponding to the effect voltage of pictorial data and be applied to control device on this liquid crystal layer according to this change signal.
In addition, this driving control device can comprise: pick-up unit, be used to detect the liquid crystal molecule that influences this liquid crystal display cells performance condition variation and export one the change signal; Voltage generation circuit is used to generate n different signal voltage, and these voltages are will be added on one group of electrode of apparent surface of a pair of substrate that is respectively formed at this liquid crystal display cells; And be used for according to selecting one group of effect voltage, organize selected effect voltage at this from the change signal of this pick-up unit, select signal voltage corresponding to pictorial data from this n signal voltage, and will this selected signal voltage be applied to device on the electrode, wherein this n signal voltage can provide at least one to act on voltage.
In addition, this driving control device preferably includes the pick-up unit that is used for by a detection signal of temperature output that detects this liquid crystal display cells, and is used for according to selecting one group of effect voltage of desiring to be applied in from the change signal of this pick-up unit, selecting corresponding at least one effect voltage of pictorial data and will act on voltage to be applied to device on this liquid crystal layer from this selected group.By this structure, no matter the temperature of this liquid crystal display cells how, can obtain having the colour demonstration of excellent visuality.
This selecting arrangement preferably includes memory storage, be used for each to a plurality of temperature ranges of liquid crystal display cells, storage desires to be added in the effect voltage on the liquid crystal layer according to pictorial data, and voltage bringing device, be used for according to pictorial data and this detection signal, from this memory storage, read effect voltage, and should act on voltage and be applied on the liquid crystal layer.
This selecting arrangement can comprise: voltage generation circuit is used to generate the pulse signal voltage on one group of electrode on the apparent surface who desires to be added to two substrates that are formed on this liquid crystal cell; Memory storage is used for corresponding to pictorial data, each storage in a plurality of temperature ranges of this liquid crystal display cells is used to specify the voltage specification signal of the effect voltage of desiring to be added on the liquid crystal layer; And the voltage modulated bringing device, be used for according to pictorial data and this detection signal modulate this pulse voltage according to the voltage specification signal of reading, and the voltage that will modulate being applied on the electrode from this memory storage read-out voltage specification signal.In this case, as this voltage modulated bringing device, can adopt rightly be used for according to the voltage specification signal change pulse voltage pulse width pulse width modulation type voltage modulated bringing device or be used for changing the pulse-height modulation type voltage modulated bringing device of the pulse height of pulse voltage according to the voltage specification signal.This memory storage is used to specify n voltage specification signal of n effect voltage in a scope that does not exceed a predetermined temperature corresponding to pictorial data storage, and two n of being used to specify in exceeding the scope of this predetermined temperature act on one in the voltage specification signal of minimum and ceiling voltage of voltage.Because this operation is even also can obtain double-colored clearly demonstration when temperature anomaly ground raises.
This driving control device can comprise pick-up unit, be used to detect a usefulness and generate a power source voltage of desiring to be applied to the voltage on this liquid crystal display cells, and be used for selecting one group of effect voltage of desiring to be applied in, selecting corresponding to the effect voltage of pictorial data and will act on voltage to be applied to device on the liquid crystal layer from this selected group according to a detection signal that comes self-test device.By this structure, no matter how supply voltage changes, and can obtain having excellent visual colour and show.
This liquid crystal display cells preferably include one have between a pair of substrate and be set to a state of orientation so that the liquid crystal cells of the liquid crystal layer that liquid crystal molecule reverses, clip this liquid crystal cells a pair of polarization plates, be arranged on light that polarization plates that retardation plate between a polarization plates and the liquid crystal cells and one is used to be reflected in the rear surface side opposite with display surface penetrates so that this light is incident upon the polarization plates of this rear surface side.In this case, the torsion angle of the liquid crystal molecule of this liquid crystal cells is an angle 230 ° to 270 ° scope, the product Δ n.d of the refractive index anisotropy Δ n of liquid crystal and the thickness d of this liquid crystal layer is the value in 1300nm to the 1500nm scope, and the length of delay of this retardation plate is the value in 1450nm to the 1750nm scope.
Above-mentioned purpose of the present invention also can be reached by such color liquid crystal display arrangement, this liquid crystal indicator comprises: a liquid crystal display cells, be used for by applying the birefringence effect that voltage is controlled this liquid crystal layer, thereby show the colored displayed image that constitutes by multiple display color to a liquid crystal layer that is clipped between a pair of substrate; The pictorial data generator is used for providing the pictorial data that is used for specifying a kind of color that n kind color desires to be shown; And driving control device, be used to drive this liquid crystal display cells, make that two types the image of being represented by the different color combination is at least switched according to the condition that influences liquid crystal molecule, one type image is represented by the combination of n kind color, and the image of another kind of type is represented less than the m kind color of n by number.
This color liquid crystal display arrangement can comprise and be used to detect the temperature of liquid crystal display cells and export the pick-up unit of a detection signal or be used to detect one be used for producing the pick-up unit of desiring to be applied to the power source voltage of the voltage on this liquid crystal display cells and exporting a detection signal, and the device that is used for switching according to the detection signal that comes self-test device the combination of image color.
Another object of the present invention is to provide a kind of method that drives color liquid crystal display arrangement, be used for carrying out colored display operation without color filter, make this color liquid crystal display arrangement can provide clearly colored and show and be not subjected to as liquid crystal drive condition effect such as temperature by the birefringence effect that utilizes light.
In order to achieve the above object, a kind of method of driving one color liquid crystal display arrangement is provided, has comprised: thereby by applying the step of controlling the birefringence effect demonstration multicolour of this liquid crystal layer corresponding to the voltage of pictorial data to the liquid crystal layer that is clipped between a pair of substrate; Be provided for limiting the step of the pictorial data of the color of desiring to be shown; Be defined as the step of the default individual effect voltage of one first group n (positive integer) of pictorial data; Limit one with this a different set of step by the group that constitutes for the individual not same-action voltage of the default m (positive integer that is different from n) of pictorial data; And one selected in this first group and another group one and apply step to the voltage that liquid crystal layer applies the effect voltage of presetting for pictorial data in this effect voltage of selected group.
In above-mentioned driving method, this voltage applies step and preferably includes a substep according to a change of the condition output signal of the performance of the liquid crystal molecule that influences liquid crystal display cells; And one selected one group to desire to be applied to the effect voltage on the liquid crystal and those effect voltages corresponding to pictorial data in the selected effect voltage group are applied to the substep of this liquid crystal layer according to this change signal.
In above-mentioned driving method, the step of each qualification effect voltage group preferably includes the substep of according to pictorial data each temperature range storage of liquid crystal display cells being desired to be applied to the effect voltage on the liquid crystal layer, and this voltage applies step and preferably includes: a substep that detects the temperature of this liquid crystal display cells and export a detection signal, a substep of reading effect voltage according to pictorial data and this detection signal from memory storage; And substep that applies the effect voltage of reading to liquid crystal layer.
In addition, in above-mentioned driving method, each step of qualification effect voltage group preferably includes the substep that is used to specify the voltage specification signal of the effect voltage of desiring to be applied on the liquid crystal layer corresponding to pictorial data for each storage in a plurality of temperature ranges of this liquid crystal display cells, and this voltage applies step and preferably includes: generation desires to be applied to the substep of the pulse signal voltage on one group of electrode on the apparent surface of the two substrates that is formed on this liquid crystal display cells, a substep that detects the temperature of this liquid crystal display cells and export a detection signal, from memory storage, read the substep of effect voltage specification signal and the substep that this voltage specification signal of reading of basis is modulated this pulse signal voltage and applied this modulated voltage to liquid crystal layer according to this detection signal and pictorial data for one.In this case, the substep of this storage voltage specification signal preferably one store in memory storage corresponding to pictorial data and to be used in the scope of a predetermined temperature that does not exceed this liquid crystal display cells, specifying n voltage specification signal of n effect voltage and to be used in a scope that exceeds this predetermined temperature this n of appointment acting on one substep in two specification signals of minimum and ceiling voltage of voltage.
Other purpose of the present invention and advantage will provide in the following description, and will partly understand or understand by putting into practice the present invention from following explanation.Objects and advantages of the present invention by the means that particularly point out in the claims or combination by cognitive and obtain.
In the accompanying drawing of the part in book as an illustration, show currently preferred embodiment of the present invention, these accompanying drawings are used for illustrating principle of the present invention with above-mentioned generality explanation and following description of a preferred embodiment together.
Fig. 1 is the cut-open view of a liquid crystal display cells in a color liquid crystal display arrangement according to an embodiment of the invention;
Fig. 2 A to 2D is respectively the orientation process direction of the direction of the phase retardation axle of the direction of the axis of homology of a polarization plates in this liquid crystal display cells that illustrates among Fig. 1, a retardation plate, a liquid crystal cells and the axial floor map of transmission of another polarization plates;
Fig. 3 is a CIE chromaticity diagram of this liquid crystal display cells among Fig. 1;
Fig. 4 is the block scheme of this liquid crystal display cells and Drive and Control Circuit thereof;
Fig. 5 is the synoptic diagram of a conversion table storing in the change-over circuit among Fig. 4;
Fig. 6 is the sequential chart of the waveform of the waveform of signal voltage of expression this liquid crystal display cells of being used for driving Fig. 1 and its scanning voltage;
Fig. 7 is the synoptic diagram of the modification of the conversion table in the presentation graphs 5;
Fig. 8 is the synoptic diagram of another modification of the conversion table in the presentation graphs 5;
Fig. 9 be according to another embodiment of the present invention liquid crystal indicator and the block scheme of Drive and Control Circuit.
A simple matrix color liquid crystal display arrangement according to an embodiment of the invention is described below with reference to the accompanying drawings.
At first will be used for the structure of the liquid crystal display cells of this embodiment with reference to figs. 1 and 2a to the 2D explanation.
Fig. 1 is the cut-open view of structure that the liquid crystal display cells 11 of this embodiment is shown.
Referring to Fig. 1, the upper and lower glass substrate 13 of liquid crystal cells 12 and 14 across one narrow space (n micron) toward each other, be sealed with liquid crystal layer 20 in this narrow space.The apparent surface that a plurality of scan electrodes 15 that are made of the transparent conductive material as ITO (indium/tin-oxide) etc. and a plurality of signal electrode 16 are respectively formed at upper and lower basic glass substrate 13 and 14 goes up intersected with each other.
Alignment films 17 and 18 is respectively formed at the surface that is formed on this two lip-deep scanning and signal electrode 15 and 16 on the inside surface of this glass substrate 13 and 14 with covering.Alignment films 17 and 18 is used for the direction of orientation of regulation liquid crystal molecule.Alignment films 17 and 18 surface live through the orientation process such as its surperficial rubbing method that rubs with a piece of cloth, with the long axis direction of liquid crystal molecule that will be contiguous along separately direction of orientation orientation.
Shaped as frame seal 19 be placed on the periphery between the upper and lower substrate with keep between the substrate 13 and 14 distance and with in the seal 19 of sealing liquid crystal between upper and lower substrate.
The product Δ n.d of the optical anisotropy Δ n of this liquid crystal layer 20 and thickness d is set as 1300nm to 1500nm.Liquid crystal molecule is according to the orientation process of alignment films 17 and 18 is reversed/is orientated by the torsion angle with 230 ° to 270 °.
A retardation plate 21 will be through the linearly polarized photon elliptic polarization of upper deflection board 22.The optical axis of this retardation plate 21 (mutually leading or phase retardation axle) is with respect to the axis of homology of upper deflection board (near of this retardation plate 21) the 22 predetermined angle that tilted.The delay of this retardation plate 21 is set as 1450nm to 1650nm.
Reflecting plate 24 is positioned on the lower surface of lower polarizing plate 23, is used for being incident on the light that also sees through liquid crystal cells 12 and lower polarizing plate 23 on the upper deflection board 22 to liquid crystal cells one lateral reflection.In this embodiment, the reflected light of reflecting plate 24 is wavelength dependencies with the minimizing diffuse transmission of being done by silver, thereby improves the display brightness of all wavelengths composition.Therefore, even when a transparent touch panel is stacked on the display surface, also can guarantee necessary display brightness.
Fig. 2 A to 2D is the floor map of each composed component, the array mode of the axis of homology of the direction of orientation of expression liquid crystal cells 12, the optical axis of retardation plate 21 and upper and lower polarization plates 22 and 23.
Double-head arrow straight line 22a among Fig. 2 A and the 2D and 23a indicate the axis of homology of upper and lower polarization plates 22 and 23 respectively.The optical axis of the straight line 21a indication lag plate 21 among Fig. 2 B.
The single arrow straight line 17a among Fig. 2 C and the orientation process direction of 17b orientation-indicating film 17 and 18.
For the convenience that illustrates, in Fig. 2 A to 2D, the long and short dot-and-dash line S that drawn is to indicate a reference line along the horizontal expansion of display surface.
Shown in Fig. 2 C, orientation process direction 17a and 18a a predetermined angular in the opposite direction with respect to 25 ° ± 10 ° of this reference line S inclinations.Because this set, liquid crystal molecule reverses/is orientated to top glass substrate 13 from lower glass substrate 14 through one 250 ° ± 20 ° angle.
The optical axis 21a of the retardation plate 21 among Fig. 2 B as the phase retardation axle, intersects with the orientation process direction 18a of alignment films 18 obliquely with 15 ° ± 10 °, supposes that here orientation process direction 18a is arranged on 0 °.
Shown in Fig. 2 A, the axis of homology 22a of upper deflection board 22 tilts 65 ° ± ° 10 ° with respect to this direction of 0 °.
Shown in Fig. 2 D, the double-head arrow straight line 23a of lower polarizing plate 23 tilts 45 ° ± 10 ° with respect to this direction of 0 °.
Fig. 3 has provided the CIE look brilliant figure of the liquid crystal display cells with said structure.As shown in Figure 3, along with the rising that is applied to the effect voltage on this liquid crystal layer, the following variation of the display color of this liquid crystal display cells: white → red → blue → green.
The state of orientation of liquid crystal molecule changes along with variation of temperature.Therefore, even identical effect voltage is applied on the liquid crystal display cells 11, display color still can change according to temperature.For example, shown in the CIE chromaticity diagram of Fig. 3, even will be used in the time of 25 ℃ showing that the effect voltage of " in vain " is applied to liquid crystal display cells 11, display color can move closer in " red " along with the rising of temperature.When 50 ℃ or higher temperature, display color almost becomes " red ".
For this reason, in having the liquid crystal display cells of said structure, when temperature raises and image is shown as " red " and other color and background when being shown as " in vain ", the background parts of this pictorial data and display part can not be distinguished from each other.
Therefore, in this embodiment, the effect voltage that (is lower than 40 ℃) under normal temperature divides 8 Change of Class.When temperature became higher (being equal to or higher than 40 ℃), display operation was performed as all middle-bracket effect voltages and is replaced by the highest effect voltage.Because this operation can double-colored clearly demonstration replace multicolor displaying.
The structure that is used to drive the driving circuit of the liquid crystal display cells 11 with this structure will be illustrated with reference to figure 4 below.
This driving circuit comprises interface 31, RAM32A and 32B, timing circuit 33, change-over circuit 34, temperature sensing circuit 35, the row driver 36A that is used for the drive signal electrode and 36B, the line driver 37 that is used for the driven sweep electrode and power circuit 38 in the present embodiment.
Be used to limit the pictorial data that displayed image is a display color and the address of indicated number position and be provided to interface 31 from external circuit.Interface 31 is in sequence of positions ground this pictorial data of storage in RAM32A by the address that is provided.
According to the timing controling signal that is provided by timing circuit 33, pictorial data is read from RAM32A and is output to change-over circuit 34.
This temperature sensing circuit 35 is made of a temperature sensor, an A/D converter etc., and detects the temperature, the particularly temperature of liquid crystal layer 20 of liquid crystal display cells 11.
RAM32B is storing the conversion table that is shown among Fig. 5.This change-over circuit 34 is read a voltage specification signal (pulse width specification signal) and is exported this signal to row driver 36A and 36B according to the pictorial data that is provided by RAM32A and from a temperature detection signal of temperature sensing circuit 35 from RAM32B.
In the present embodiment, carry out 8 color display operations by the voltage that maximum 8 kinds of grades are provided to liquid crystal display layer 20.Carry out display operation in order under normal temperature, (to be lower than 40 ℃), be used for limiting the pictorial data of 8 kinds of colors and be used to 8 kinds of voltage specification signals (grade sign indicating number 0 to 7) of the effect voltage of the color appointment that demonstration limits by this pictorial data correspondingly to be stored in RAM32B each other.For the display operation of (40 ℃ or higher) under higher temperature, pictorial data and voltage specification signal are stored among the RAM32B with corresponding to each other as follows, promptly make to become the voltage specification signal (grade sign indicating number 7) that is used to specify highest voltage corresponding to all the voltage specification signals (grade sign indicating number 1 to 6) that are used to limit the pictorial data that is shown by middle-bracket effect voltage.These data and signal are used as conversion table storage.
When the pictorial data of reading from RAM32A limits " red " and is a normal temperature from the detected temperature of temperature sensing circuit 35, change-over circuit 34 output voltage specification signal grade sign indicating numbers " 5 ".When detected temperature is a higher temperature (40 ℃ or higher), change-over circuit 34 output voltage specification signal grade sign indicating numbers " 7 ".When pictorial data limits " orchid " and detected temperature and is a normal temperature, change-over circuit 34 output voltage specification signal grade sign indicating numbers " 6 ".When detected temperature is higher temperature, change-over circuit 34 output voltage specification signal grade sign indicating numbers " 7 ".When pictorial data limited " green ", no matter detected temperature how, change-over circuit 34 was all exported a voltage specification signal grade " 7 ".
By TAB method, COG method etc., row driver 36A and 36B are connected on the signal electrode 16 of liquid crystal display cells 11.Row driver 36A and 36B apply by the waveform among Fig. 6 (B) and the signal voltage of (D) indicating to signal electrode 16 according to the timing controling signal that comes self-timing circuit 33 with from a voltage specification signal of change-over circuit 34.
More specifically, each signal voltage is made of a pulse voltage, and row driver 36A and 36B by change pulse width W regulate impose on liquid crystal layer 20 respectively act on voltage.
Suppose that T is the selection cycle of each scan electrode for each row, and G is the value of grade sign indicating number, then pulse width W is provided by W=TG/7.Therefore, shown in the waveform among Fig. 6 (B), to grade sign indicating number 0, W=0, to grade sign indicating number 7, W=T, and to grade sign indicating number 1 to 6, W=T/7 to 6T/7 is shown in waveform (D).
Line driver 37 is connected on the scan electrode 15 of liquid crystal display cells 11 by TAB method, COG method etc.Line driver 37 applies one by the scanning voltage shown in the waveform (A) according to timing controling signal.
Power circuit 38 generates by row driver 36A and 36B and uses to generate the voltage V0 to V3 of signal voltage.Power circuit 38 also generates by line driver 37 and uses to generate the voltage V0 and the V4 to V6 of scanning voltage.
The course of work that below explanation is had the colour liquid crystal display device of said structure.
According to the timing behaviour system signal that comes self-timing circuit 33, read in turn in the change-over circuit 34 from outer CPU etc. and the pictorial data that is written among the RAM32A via interface 31.
The detection signal that temperature sensing circuit 35 detects the temperature of liquid crystal displays 11 and exports the temperature that an expression detected is in conversion table 34.
In response to this timing controling signal, change-over circuit 34 is according to this temperature detection signal and read a voltage specification signal from the pictorial data of RAM32A from this conversion table that is stored in RAM32B, and this voltage specification signal is outputed among row driver 36A and the 36B.
When this detected temperature is 30 ℃, because it is lower than 40 ℃, change-over circuit 34 will be visited being used for the conversion table below 40 ℃ and reading a voltage specification signal corresponding to this pictorial data of reading from RAM32A among Fig. 5.That is this change-over circuit 34 is converted to a voltage specification signal with this pictorial data.For example, be used for limiting the pictorial data of " in vain " and be converted into voltage specification signal grade sign indicating number " 0 "; The pictorial data that is used for qualification " red " is converted into voltage specification signal grade sign indicating number " 5 "; The pictorial data that limits " orchid " is converted into voltage specification signal grade sign indicating number " 6 "; And the pictorial data that limits " green " is converted into voltage specification signal grade sign indicating number " 7 ".Then change-over circuit 34 is exported such voltage specification signal.
Row driver 36A and 36B be according to the voltage specification signal modulation signal voltage that is provided, and modulated signal voltage is applied on the signal electrode 16.For example, when receiving a voltage specification signal grade sign indicating number " 0 ", each driver is to signal voltage W=0 of signal electrode 16 outputs, and this signal voltage is shown in the waveform among Fig. 6 (B).When receiving a voltage specification signal grade sign indicating number " 7 ", each driver output a signal voltage W=7 give signal electrode 16, and this signal voltage is shown in the waveform among Fig. 6 (B).When receive voltage specification signal grade sign indicating number " 1 " in " 6 " any the time, each driver is signal voltage W=T/7 to 6T/7 of each intermediate grade sign indicating number output, shown in the waveform among Fig. 6 (D).
Simultaneously, scanning voltage with waveform (A) is applied on the scan electrode 15, and one by waveform (C) or the effect voltage that constitutes of the driving voltage (E) be applied on the each several part facing to scanning and signal electrode 15 and 16, be on each pixel parts of liquid crystal layer 20, thus the color that subsequently displaying transmitted image data limits on each pixel.
When detected temperature for example was 50 ℃, because it is higher than 40 ℃, change-over circuit 34 was used for 40 ℃ or above conversion table and converts pictorial data to this conversion table correspondent voltage specification signal.Be used for 40 ℃ or above conversion table according to this, be used for limiting the pictorial data of " in vain " and be converted into voltage specification signal grade sign indicating number " 0 ", and all pictorial data that are used for qualification " red ", " orchid ", " green " etc. all are converted into voltage specification signal grade sign indicating number " 7 ".Change-over circuit is exported these voltage specification signals then.
The signal voltage that row driver 36A and 36B also will modulate according to the voltage specification signal modulation signal voltage that is provided is applied on the signal electrode 16.For example, when receiving the such voltage specification signal of grade sign indicating number " 0 ", a signal voltage W=0 is to signal electrode 16 in each driver output, and it is shown in waveform (B) and corresponding to grade sign indicating number " 0 ".When receiving the such voltage specification signal of grade sign indicating number " 7 ", signal voltage W=T of each driver output, it is shown in waveform (B) and corresponding to grade sign indicating number " 7 ".
Therefore, in this case, display color is not " in vain " promptly to be " green ".That is the image with 8 kinds of colors that limited by pictorial data is converted into the image that only has two kinds of colors, and background is " in vain " and the display part is " green " in the image of these two kinds of colors.Though destroyed visual color to a certain extent, can demonstrate the high visual two-tone image that has that clearly to distinguish.
As mentioned above, according to the present invention,, also can demonstrate image clearly even when the temperature of the rising of the temperature in the working environment and this liquid crystal layer itself rises.
In the above-described embodiments, 40 ℃ are selected as from the multicolour display operation and are transformed into the temperature spot that double-colored colour display screen shows operation.But, can select arbitrary temp as this temperature, for example can select 35 ℃ or 50 ℃.
In the above-described embodiments, in detected temperature was lower than 40 ℃ normal temperature range, even when temperature variation, corresponding to identical pictorial data, the effect voltage that is applied on the liquid crystal layer 20 was fixed.But, for example also can utilize the conversion table that is shown among Fig. 7.In this case, in detected temperature was lower than 50 ℃ temperature range, the effect voltage that is applied on the liquid crystal layer 20 was that unit reduces the variation that raises with temperature with compensating color with predetermined temperature variation stride with the grade sign indicating number.
More specifically, according to the conversion table of Fig. 7, no matter how high temperature is, be used for limiting " in vain " always pictorial data be converted into the such voltage specification signal of grade sign indicating number " 0 ".On the other hand, the pictorial data that is used for limiting " red " is 30 ℃ or more hour detecting temperature.Be converted into the such voltage specification signal of grade sign indicating number " 5 "; In detected temperature is 30 ℃ or bigger but during less than 40 ℃, be converted into the such voltage specification signal of grade sign indicating number " 4 "; And it is 40 ℃ or bigger but during less than 50 ℃, be converted into the such voltage specification signal of grade sign indicating number " 3 " in detected temperature.By this operation, display color is compensated with variation of temperature in normal temperature range (being below 50 ℃ in this example), and almost identical with the color of pictorial data qualification color can be shown.In detected temperature was unusual 50 ℃ or higher high-temperature scope, all pictorial data that are used for limiting the employed intermediate color that comprises " red " were converted into voltage specification signal grade sign indicating number " 7 ".Its result, " green " different with the color that is limited by pictorial data are shown.This is because when " green " when being shown, the state of orientation of liquid crystal molecule is a kind of forced regime, wherein apply according to voltage specification signal grade sign indicating number " 7 " effect voltage when (promptly the highest effect voltage) liquid crystal molecule almost holded up, and can not be subjected to other condition effect such as temperature in this state.
As mentioned above, under the normal temperature in a temperature range of being scheduled to, correctly shown by the color that pictorial data limits by temperature compensation.Exceeding under the unusual high temperature of this preset range,, executing a kind of double-colored demonstration to provide one to show clearly by utilizing the highest and minimum effect voltage.Please note, though having applied state of orientation corresponding to the liquid crystal molecule on the transparency carrier of the minimum effect voltage of voltage specification signal grade sign indicating number " 0 " is that rising with temperature changes, but, compare not very big in the situation of the variation of this state of orientation to the influence of display color and intermediate grade (grade sign indicating number 2 to 6).That is some is rubescent slightly in vain.In this case, can take place hardly the destruction of the visuality that shows.
In the above-described embodiments, " in vain " and " green " be selected as display color in maximum temperature.This is because be used for showing that the difference between the effect voltage of " in vain " and " green " is big, and " green " can not be acted upon by temperature changes and demonstration with being stabilized.But display color is not limited to these colors, can select color arbitrarily according to characteristic of liquid crystal display cells 11 etc.
The number of the display color under higher temperature is not limited to two kinds, can be three kinds or more.For example, when detected temperature exceeded a predetermined value, pictorial data can be converted into the following three kinds of voltage specification signals in the relevant temperature scope: be used for the signal (grade sign indicating number 3) of " red ", the signal (grade sign indicating number 7) that is used for the signal (grade sign indicating number 4) of " orchid " and is used for " green ".In this case, display operation can be performed by utilizing three primary colors " red ", " green ", " orchid ", and can not destroy and show a color image visually.
In addition, the display color in normal temperature also is not limited to 8 kinds of colors.That is, by selecting at least one group in following two groups rightly, promptly constitute one group by n effect one group of constituting of voltage with by the individual effect voltage of m (m is different from n), and the effect corresponding to pictorial data in selected group pressed be applied on the liquid crystal layer, present invention can be applied to and make it to obtain colored clearly the demonstration in the color liquid crystal display arrangement.
Explain another embodiment of the present invention with reference to Fig. 9 below.
In this embodiment, replace detecting the temperature of this liquid crystal display cells 11, measure the supply voltage of power circuit 38 by a tension measuring circuit 39.This measuring-signal is output to change-over circuit 34.In the scope of each predetermined power source voltage, determined to be stored among the RAM32B corresponding to a conversion table of the voltage specification signal of pictorial data.In this example, to be shown in Fig. 5 similar with the conversion table in 7, be arranged on the number of the different voltage specification signals in each voltage range, the number of promptly different effect voltage differs from one another.Change-over circuit 34 according to from RAM32A by measuring-signal measuring that supply voltage obtains and pictorial data, read-out voltage specification signal from RAM32B, and these signals are exported to row driver 36A and 36B.Other structure and above identical with reference among the embodiment of figure 4 explanation.
Because this operation, can obtain having that excellent visual colour shows and the influence that is not subjected to mains voltage variations.In this example, when mains voltage variations, decide the effect voltage difference that signal applies corresponding to the same electrical end finger.But, if considering the effect variation in each supply voltage scope, the voltage specification signal sets, then can obtain required display color.
At present embodiment, if the temperature of liquid crystal display cells is detected, and the group of the effect voltage of desiring to be applied in is switched according to the temperature that detected, even then when the temperature of liquid crystal display cells and supply voltage all change, also can arrive the color image with better visuality.
The invention is not restricted to two embodiment described above, other various embodiment are also included within the scope of the present invention.
In above example, the group of effect voltage is by according to changes such as the temperature of the condition of the performance that influences liquid crystal molecule such as liquid crystal cell, supply voltages.But, in addition, also can come the group of the effect voltage that conversion desires to be applied in according to the difference between color that limits by pictorial data and the display color, this display color is detected by a color sensor.In this case, always detect the pixel setting pictorial data of its display color and the like combinations of voltage specification signal for desire.For example, if utilize conversion table among Fig. 5, detecting pixel to a color provides pictorial data " in vain " just enough.
In the various embodiments described above, by utilizing conversion table, pictorial data is converted into the voltage specific data.Yet the pictorial data of reading from RAM32A also can be converted into the pictorial data of representing a color that can be shown, and can be added on the signal electrode 16 corresponding to the signal voltage that passes through the pictorial data of this conversion.As mentioned above, the method that is used for limiting display color can be selected arbitrarily.
Note that ripple among Fig. 6 opens (A) and (E) example just, the present invention is not limited to this.
In the various embodiments described above, the present invention is applied to being designed to regulating in the PWN type color liquid crystal display arrangement of pulse width W of a pulse signal according to the voltage specification signal.Yet the present invention also can be applicable to be designed to regulate in the PAM type color liquid crystal display arrangement of pulse height of a pulse signal according to the voltage specification signal.
In the various embodiments described above, the simple matrix liquid crystal display element is driven by time-division ground.Yet the present invention also can be applicable to as using on the TFT active matrix liquid crystal display devices as active component such as (thin film transistor (TFT)s).In this case, the voltage that is applied on each pixel capacitors via a data line and an active component changes according to drive conditions such as pictorial data and temperature.
In the various embodiments described above, the characteristic of liquid crystal cells 12 can at random change as torsion angle and length of delay.For example, can adopt a liquid crystal cells with torsion angle of 100 ° to 140 °, this corner is bigger than general TN liquid crystal cells.In this case, can obtain excellent color-separated performance, and compare with the TN liquid crystal cells with about 90 ° torsion angle, the excitation of each display color can be enhanced.
The present invention is not limited only to the TN liquid crystal display cells, passes the liquid crystal display cells that the birefringence of the light of element changes the type of display color thereby also can be applied to other Control of Voltage that is applied by control.For example, the present invention can be applied to utilizing in the liquid crystal display cells of liquid crystal cells as liquid crystal cells 12 of a perpendicular molecules orientating type, horizontal molecular orientation type or mixed molecules orientating type.
In the various embodiments described above, used reflection type liquid crystal display element 11 with reflecting plate 24.Yet the present invention also can be applied to the transmission-type liquid crystal display element.
Other advantage and distortion are expected easily to those skilled in the art.Therefore, the present invention broadly is not limited to the detail, representative device and the illustrative example that illustrate and illustrate here.Can not break away from the scope of the present invention that is limited by claims or its equivalent and make various distortion, they all should belong to category of the present invention.
Claims (21)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96104911 CN1160863A (en) | 1995-04-20 | 1996-04-22 | Color liquid crystal display device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP95280/1995 | 1995-04-20 | ||
| JP180579/1995 | 1995-06-26 | ||
| CN 96104911 CN1160863A (en) | 1995-04-20 | 1996-04-22 | Color liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1160863A true CN1160863A (en) | 1997-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96104911 Pending CN1160863A (en) | 1995-04-20 | 1996-04-22 | Color liquid crystal display device |
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| CN (1) | CN1160863A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100572963C (en) * | 2004-05-19 | 2009-12-23 | 乐金电子(天津)电器有限公司 | The front panel of air conditioner |
| CN103366698A (en) * | 2012-03-27 | 2013-10-23 | 精工爱普生株式会社 | Signal processing device, liquid crystal apparatus, electronic equipment and signal processing method |
| CN119644623A (en) * | 2023-09-18 | 2025-03-18 | 海信视像科技股份有限公司 | Display apparatus |
-
1996
- 1996-04-22 CN CN 96104911 patent/CN1160863A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100572963C (en) * | 2004-05-19 | 2009-12-23 | 乐金电子(天津)电器有限公司 | The front panel of air conditioner |
| CN103366698A (en) * | 2012-03-27 | 2013-10-23 | 精工爱普生株式会社 | Signal processing device, liquid crystal apparatus, electronic equipment and signal processing method |
| US9514700B2 (en) | 2012-03-27 | 2016-12-06 | Seiko Epson Corporation | Signal processing device, liquid crystal apparatus, electronic equipment, and signal processing method |
| CN103366698B (en) * | 2012-03-27 | 2017-03-01 | 精工爱普生株式会社 | Signal processing apparatus, liquid-crystal apparatus, electronic equipment and signal processing method |
| CN119644623A (en) * | 2023-09-18 | 2025-03-18 | 海信视像科技股份有限公司 | Display apparatus |
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