WO2012042016A1 - Display apparatus with simultaneous refreshing of all pixels - Google Patents

Display apparatus with simultaneous refreshing of all pixels Download PDF

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Publication number
WO2012042016A1
WO2012042016A1 PCT/EP2011/067101 EP2011067101W WO2012042016A1 WO 2012042016 A1 WO2012042016 A1 WO 2012042016A1 EP 2011067101 W EP2011067101 W EP 2011067101W WO 2012042016 A1 WO2012042016 A1 WO 2012042016A1
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WO
WIPO (PCT)
Prior art keywords
image
memory
characterized
display
according
Prior art date
Application number
PCT/EP2011/067101
Other languages
German (de)
French (fr)
Inventor
Frank BREDENBRÖCKER
Original Assignee
Bredenbroecker Frank
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE201010037899 priority Critical patent/DE102010037899B4/en
Priority to DE102010037899.2 priority
Application filed by Bredenbroecker Frank filed Critical Bredenbroecker Frank
Publication of WO2012042016A1 publication Critical patent/WO2012042016A1/en

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3648Control of matrices with row and column drivers using an active matrix
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G09G5/39Control of the bit-mapped memory
    • G09G5/399Control of the bit-mapped memory using two or more bit-mapped memories, the operations of which are switched in time, e.g. ping-pong buffers

Abstract

The invention relates to a display apparatus (1) for displaying images for televisions or computers, having two carrier plates (20), wherein at least one carrier plate (20) has an electrode layer (30) which drives a display element (10), wherein the display element (10) has an image matrix (M) of pixels (11) which are arranged in horizontal rows (Z) and vertical columns (S). The invention provides for the electrode layer (30) to have a first memory (50) in which display values (12) of an image frame (A, B) can be stored row (Z) by row (Z+1) in succession for the pixels (11), and for the pixels (11) to be able to be driven at the same time when all display values (12) of an image period (T, T+1) are completely present for the entire image matrix (M) in the first memory (50).

Description

DISPLAY DEVICE WITH SIMULTANEOUS REFRESH EVERY VISUAL POINTS

Description

The present device relates to a display device for image display of TV or computer with two supporting plates, wherein at least one support plate having an electrode layer, which drives a display element, said display element having an image array of pixels arranged in horizontal rows and vertical columns.

In conventional display devices images are constructed pixel by pixel. Here, the data is sequentially written line by line and point by point is on display in the individual pixels. depending on the image change sequence - - Since this writing process takes time, the first pixel is represented by a certain time prior to the last pixel of the complete image. A complete picture frame is available only for a fraction of time on the entire screen. In particular, this problem is visible in the display devices for displaying images in 3D. It is known that in order to win a stereoscopic visual impression, the brain needs two images that are slightly offset in the horizontal plane. From these different images, the brain recovers the depth information. therefore, the screen must be on the same surface display two images, one for the left eye and a right to the eye. The images are shown alternately in quick succession, so that the brain can perceive the two frames as a spatial picture. To separate these images shutter glasses is used, which allows only one of its glasses appear in synchronism with the displayed image in each case transparent. The image change must take place very quickly so that the viewer can not perceive the darkening of the lenses. If the picture change performed too early part of the last picture are still visible. Will he performed too late, the next image is already built. In these cases, there are intermediate images, ghosting so-called, which can lead to headaches in the worst case.

To synchronize the shutter glasses, a period must be found in which all pixels of the new image to be displayed are shown complete, the next image has not yet begun. If the darkening of the lenses does not synchronize exactly with the image changes, the information for an eye become visible, which are intended for the other eye. In these cases there is a sharp weakening of 3D effect. Furthermore, the period allowed in the glasses, the image turns freely, not be too short, since the image brightness is continuously decreasing with longer darkening. The image on the screen must be displayed more brightly then, resulting in an increased energy consumption.

It is therefore the object of the present invention to provide a device which avoids a continuous pixel-based image change, which represents a fundamental problem of conventional display devices.

This object is achieved by all of the features of the independent patent claim 1. Advantageous further developments are specified in the dependent claims 2 to 16th Furthermore, the object is solved by all of the features of the independent claim 17th In the dependent claims 18 to 22 all, advantageous developments are given.

For this purpose the invention provides that display values ​​for the image points of an image frame in succession, row by row, are stored in a first memory, wherein the pixels are only controlled simultaneously, if all indication values ​​of the frame period for complete image matrix in the first memory are fully available , In this way, the full image of an entire image frame can be written to memory without changing the image information of the previous frame period currently displayed by the display element. Upon completion of the write operation to take over the charge is simultaneously triggered by the memory to the latest cell of the image matrix for all pixels. After that, the screen layout for the next picture in the memory can be made. The caching is done completely on the display device. The technique of the serial transmission of the image information on the output medium remains unchanged.

Advantageously, the memory may comprise a memory array of memory elements, wherein each pixel is associated with a memory element. Consequently, each pixel can be connected directly to a memory element. The information building a complete image frames for all pixels of the display element can be carried out in the memory. Only in a separate subsequent step, the information transfer can be performed on the pixels of the display element through a display rewriting values ​​from the memory to the image points. The memory elements may be formed as capacitors, transistors, or superconducting magnetic memory elements in this case.

A further measure of the invention may provide a second memory to buffer the display values ​​for a new image frame of a subsequent frame period, while the first memory drives the pixels during a recent field period. In an advantageous manner, all the pixels of the display element can synchronism represent the respective current image frame, comprising the display values, the first memory over the complete frame period available. Subsequently, when the memory operation is completed in the second memory and all of the display values ​​of the next frame period are completely present therein, the second memory takes over the driving of the pixels. The second memory may advantageously be disposed adjacent to the first memory. The second memory may also include a memory array of memory elements which are assigned to the pixels of the display element. The memory elements of the second memory may be formed for example as capacitors.

Alternatively, a control unit can be provided which has control circuits for each liquid crystal molecule, in particular the drive unit passes all displayed values ​​of a fully stored image frames of an image period to the pixels simultaneously. Here, the drive circuits can be formed for example as transistors. The drive unit can generate according to the invention the transfer pulse when the save a complete image frame is completed in the memory. After overwriting the image formation of the next image frame starts in the memory. The control electronics have to be up to the generation of pulse takeover not changed. The picture frame currently displayed by the image matrix remains unchanged within one frame period. There are no intermediate images.

The display device according to the invention can advantageously be designed for displaying SD pictures, wherein an image frame for a left eye and an image frame for a right eye one after the other can be displayed by the display device. The display device can be synchronized with shutter glasses, which addresses the first image frame in the left eye and the second image frame to the right eye, to create a 3D effect.

In a preferred embodiment of the present invention, the display device can be implemented as an LCD screen. Here, the pixels may be formed as the liquid crystal molecules or ferroelectric liquid crystal molecules. Liquid crystals are organic compounds which have properties of both liquids and solids. Liquid crystal molecules have a dipole moment. The ferroelectric liquid crystal molecules also arrange themselves so that a spontaneous polarization is generated in the liquid crystal. In addition, the liquid crystals have a strong birefringence, so that a light passing through such a liquid, is elliptically polarized. one applies the liquid to a voltage, the liquid crystal molecules align in the electric field, the effect of the double refraction does not occur. A pixel on the display element can thus be displayed in light or dark.

Advantageously, the liquid crystal display element between two supporting plates may be arranged, which are constructed as glass plates. Here, the inner sides of the glass plates may be coated with at least one electrode layer can be formed in particular from indium / tin oxide. By applying a voltage by means of the electrode layer, the liquid crystal molecules are aligned. Depending on the magnitude of the voltage the liquid crystal molecules may be differently deflected from their original orientation. Depending on the angle between the optical axis of the liquid crystal molecules and the direction of incidence of the light, the shape of the ellipse that determines the polarization of the light can be varied. In this way, the light intensity that leaves a pixel to be changed.

It can be inventively provided that the glass plates have at least one orientation layer to force the liquid crystal molecules in a predetermined direction. The alignment layers may be formed for example of a polymeric material. Furthermore, the alignment layers may be arranged on the electrode layers. The liquid crystal display element can be mounted between the alignment layers. Advantageously, grooves can be incorporated, which align the nearby liquid crystal molecules in a predetermined spatial direction in the orientation layers. In this way, in the liquid crystal layer a helix can be generated when no electric field is applied. To achieve this, the glass plates at a certain angle to rotate each other so that those influenced by the orientation of liquid crystal molecules layers follow this rotation. Thus, a helical passage of the dipole moments of liquid crystal molecules can be created. Thus, there can be formed a helix whose pitch angle corresponds to the angle between the glass plates. The angle may be 90 °, 180 °, or 270 ° are selected. According to the invention two polarizers can be positioned on the outer sides of the glass plates. Advantageously, the polarizers can be designed as a polarization filter, in particular, whose polarization directions are rotated by 90 ° to each other. Thus, the polarized through the lower polarizer light can undergo a rotation of its polarization plane by 90 ° and then pass freely through the upper polarizer in the liquid crystal layer. However, if a field is applied, this field forces to align along the field lines of the liquid crystal molecules. The helix is ​​destroyed. Consequently, no rotation of the polarization plane of light takes place. The light can not pass through the upper polarizing filter unhindered. The propagation of light is hereby prevented, the point on the screen remains dark. If the polarization directions of the polarizers selected parallel to each other, so the pixel remains dark and only becomes transparent as the voltage increases. This allows you to create the contrast ratio on the display element. In other advantageous embodiments of the present invention, the polarizers can be rotated 180 ° and 270 ° to each other in order to achieve an even better contrast ratio. Advantageously, the polarization directions of the orientation layers may be selected equal to the polarization directions of the nearest polarizers.

According to the invention it can be provided that at least one, especially two compensating films are disposed on the outer sides of the liquid crystal indicator element in order to compensate a color splitting of the liquid crystal display element by glowing light. During the propagation of light through the liquid crystal can cause a color shift because the refractive indices and the propagation direction of light depending on the wavelength. The compensation films can advantageously serve that the phase shift for different colors is canceled. Thus can be achieved that smearing of colors is prevented. In an alternative embodiment, the display element may comprise two liquid crystal layers to prevent color splitting. The first liquid crystal layer can be actively driven by a voltage in this case, the second liquid crystal layer is twisted in an opposite direction. Passes through the light, the two layers is compensated for the phase shift, which was caused by the first liquid crystal layer through the second layer. Furthermore, a color filter layer may be provided to image in an RGB color space three primary colors red, green and blue to produce. Here, the color filter layer advantageously color selective polarizing filter can include. To map a color to a pixel, three liquid crystal molecules are needed. The three liquid crystal molecules may be assigned a color filter that selectively transmits the red, green and blue. The desired color is reproduced by the proportions of the primary colors red, green and blue. In another embodiment, the color filter layer may comprise a colored filter to convert white light into the colors of red, green or blue. Alternatively, instead of the color filter layer a special gas can be dissociated in the liquid crystal display element which absorbs certain wavelengths of the incoming light and thus can appear colored particular pixel.

According to the invention that a reinforcement plate is arranged on the liquid crystal display element can be provided. The reinforcement plate may include memory elements, especially capacitors for each liquid crystal molecule. The memory elements can advantageously serve to maintain charge of liquid crystal molecules during a frame period. In order to display the display values ​​of an image frame by means of liquid crystal display element, a charge to the liquid crystal molecules is applied, the amount of data information corresponds. but the applied load can degrade relatively quickly. In order to obtain the charge, an additional capacitor may be connected in parallel with the liquid crystal molecules in each case. After application of the charge, the liquid crystal molecules are switched by the additional memory elements back to the high impedance state in which the memory elements to build an additional resistance. Thereby, the charge is retained longer, so that the emission brightness of the liquid crystal display element is maintained during one frame period substantially.

Alternatively, the display element may include ferroelectric liquid crystal molecules in order to obtain the charge on the pixels during a frame period. The ferroelectric liquid crystal molecules have to store electrical fields long the property. Thus, an improved contrast of the image frames shown can be achieved. Only after the readings are for the next picture frame in the first and second memory available, the ferroelectric liquid crystal molecules can be switched.

According to the invention can be arranged to illuminate either actively or passively illuminate the display element with reflected light of a light source adjacent to one of the glass plates, an illumination plate. An active lighting plate may for example comprise light emitting diodes or organic light emitting diodes. Alternatively, the lighting plate can be designed as a mirror which reflects the light of a especially punctiform light source onto the liquid crystal display element.

The display device according to the invention can thus be used for image display of 3D images, in particular, the display device is designed as a LCD screen.

In a further embodiment of the present invention, OLEDs may be provided as pixels. Here, the support plates may be formed of different carrier materials which may be flexible, among other things. Here, the OLED pixels can directly emit light by application of a voltage by means of the electrode layer, a colored light.

According to the invention the advantage is that by no more pixel-wise but image-wise image construction, problems of image display in normal 2D television operation, resulting in particular on the issue of calculated intermediate images can be reduced is also produced.

Furthermore, said object is achieved by a method having the features of claim 17th In the dependent claims 18 to 22 advantageous embodiments are described.

The inventive method includes the ability to display images for televisions and computers by means of a display element is arranged between two supporting plates and an image matrix comprises, arranged in horizontal rows and vertical columns. For this purpose the invention provides that the image structure of an image frame is performed in two steps separated from one another. In the first step, all displayed values ​​of an image frame for the pixels sequentially line by line are stored in a first memory. In the second step, the pixels are driven simultaneously. The second step is initiated when the first step, that is, when the storage process for all display values ​​of a field period for complete image matrix in the memory is complete. Here, each pixel is assigned a memory element.

In a possible alternative of the present invention, a second memory can be provided to perform the steps of the method according to the invention alternately to the first memory. Here, an image frame is built up in the first memory while the second memory accepts the transfer of the display values ​​of pixels of the display device. In yet another alternative of the invention a control unit may be provided which performs the second step of the inventive method. Here, the control unit generates a strobe pulse when the memory operation of the first step has been completed in the memory. The pixels can thereby be implemented as a liquid crystal molecules, ferroelectric liquid crystal molecules or OLEDs.

The inventive method can be used to view 3D images. Here, the display element can be advantageously carried out as a liquid crystal display element comprising an image matrix of liquid crystal molecules. The display information for the respective liquid crystal molecule can be according to the invention inscribed in a first step in a first memory. The liquid crystal molecules retain at this time their previous voltage information. Thus, the electric field is not changed, and the liquid crystals retain their previous direction. After writing a complete image frames the image information from the memory will now be transferred directly to the liquid crystal molecules in the second step. In this way, the electric field of all pixels of the whole screen is changed simultaneously, the new image information is displayed simultaneously in all the pixels. For a shutter glasses is now the entire period until the establishment of a new image frames available. The respective left and right images for the glasses are completely separated from each other. Thus can be completely avoided in the presentation of the image frame ghosting. The synchronization of the shutter glasses and the display device can thus be carried out accurately. Furthermore, the image displayed within this period is not changed. Consequently, the brightness of the display in 3D mode does not have to be raised. Conventional monitors that provide the 3D effect by means of shutter glasses must radiate much brighter because, due to the short time in which the left or right stereo image of the shutter glasses is available, the output brightness is lost. Another important advantage of the present invention is that the display device of the invention need not be operated at an extremely high frame rate at which the effect of ghosting should be avoided so far. Advantageously, the conventional method for synchronizing the shutter glasses and the display device may remain unchanged.

Features and details described in connection with the inventive method, obviously apply also in connection with the inventive device and vice versa.

Furthermore, the inventive device to be operated by the inventive method and are synchronized with shutter glasses corresponding to a left eye and an image frame is addressed to a right eye alternately an image frame to produce a 3D effect.

Further advantages, features and details of the invention will become apparent from the following description in which an embodiment of the invention is described with reference to the drawings. The features mentioned in the claims and in the description can be essential to the invention individually or in any combination. Show it:

Figure 1 shows a possible alternative embodiment of the switch according to the invention as an LCD screen,

Figure 2 is an exemplary illustration of a pixel in a conventional

Display device, Figure 3 is an exemplary illustration of a pixel in the display device according to the invention,

4 shows an exemplary sequence of a conventional method of

Image display on an image matrix,

5 shows an exemplary sequence of the method for

Image display on an image matrix and

6 shows the sequence of the method according to the invention the example of a line of

Image matrix.

1 shows an alternative embodiment of the present invention is shown. The display device 1 is in this case designed as an LCD screen, which is designed, among other things for the display of 3D images. There are two supporting plates 20 shown, which may be prepared as glass plates 20 according to the illustrated embodiment. The glass plates 20 each have an electrode layer 30 disposed on the inner sides of the glass plates 21 twentieth Between the glass plates 20, a liquid crystal display element 10 is arranged, which has an image matrix M of liquid crystal molecules 1 1, which are arranged in horizontal rows and vertical columns S Z. By applying a voltage by means of the electrode layer 30, the liquid crystal molecules 1 1 along the field lines are aligned. The charge on the liquid crystal molecules 1 1 in this case corresponds to the display 12 values ​​of a current image frame A, which is formed by the image matrix M. To produce a 3D effect, a frame image A of a frame period for a left eye and a next image frame of the subsequent frame period is represented by the image matrix M after the other. two polarizers 40 are attached to the outsides of the glass plates 22 20th The polarizers 40 have different polarization directions, which are twisted in the illustrated embodiment, alternative by 90 ° to each other. The display element 10 is illuminated with the light of a lighting panel 60th First, the light emitted by the illumination plate 60 passes through the lower polarizer 40 and is linearly polarized. First, the polarized light passes through the lower glass plate 20, enters into the display element 10 and undergoes a rotation of the polarization plane by 90 °. Subsequently, the light passes through the upper polarizer 40 from freely when no voltage is applied through the electrode layer 30th According to the invention, a memory 50 is provided on one of the glass plates 20th The display values ​​12 for the liquid crystal molecules 1 1 of the image frames A are completely stored first in the memory 50 and then simultaneously transmitted to the liquid crystal molecules 1. 1 During a complete period of time between the image change, the liquid crystal molecules 1 1 show the indication values ​​12 of the complete image frame A.

2 shows an exemplary illustration of a pixel in a conventional liquid crystal display device, and Figure 3 in the inventive display device. Both figures show the basic building blocks of a pixel based on LCD technology. Here, a liquid crystal display element 10 is arranged between two glass plates 20th The glass plates 20 have on the sides 21 facing the display element 10, in each case, an electrode layer 30. Further, 20 have the glass plates to a drive unit 70, the drive circuits 71 comprises for liquid crystal molecules. In addition, the glass plates are provided with an orientation layer to align the liquid crystal molecules in a predetermined direction. On the outer sides 22 of the glass plates 20 are each a polarizer 40 is attached, which can be exemplified as a polarization filter. The pixel shown schematically is configured to display an arbitrary color in an RGB color space. The color is composed of three primary colors, red, green and blue. The pixel is therefore associated with three liquid crystal molecules that reflect the colors. By applying a voltage by means of the electrode layer 30, an electric field is induced in the display element 10th The liquid crystal molecules align themselves to the field. The stronger the applied field, the greater is the inclination of the optical axes of the liquid crystal molecules at the pitch. If a linearly polarized light that has been polarized by the upper polarizer 40 enters the liquid crystal layer 10, it becomes elliptically polarized. Depending on the orientation of the optical axis of the liquid crystal molecules to the light propagation direction, that is, depending on the level of the applied voltage, the polarization of the light changes. The ratio of the intensity between two orthogonally polarized sub-beams the elliptically polarized light can thus be varied and, finally, the intensity of which is transmitted through the lower polarizer 80 of the light. Thus, a the proportion of the respective primary color R, G, B and is changed to the pixel to represent the pixel color, on the other hand generates the brightness of the pixel to produce a contrast ratio on the display element 10th

The liquid crystal molecules in Figure 2 are driven, in contrast to the embodiment shown in Figure 3 embodiment of the invention one after the other, resulting in a time difference in the representation of display information on individual liquid crystal molecules. As shown in Figure 3, a memory is provided according to the invention 50, comprising the memory elements 51 for each liquid crystal molecule. The readings for the liquid crystal molecules are first sequentially written into the storage elements 51 of the memory 50th The liquid crystal molecules retain at this time their previous voltage information. The electric field is not changed by the electrode layer 30th The liquid crystals retain their orientation. After the save in the memory 50 has been completed, the stored readings will now be simultaneously transmitted to the liquid crystal molecules. The electric field of all pixels of the entire image matrix is ​​simultaneously changed by the electrode layer 30th The new image information is transferred simultaneously to all liquid crystal molecules. A complete picture frame is all the time between the image change represented by the structure of a new image frame through the display element 10th

In Figure 4, a known method is shown, wherein an image frame A (ti) is set up to an image matrix of a display device pixel by pixel. Here, the data is sequentially written line by line and point by point is on display in the individual pixels. Initially, the previous image frame is almost completely visible. Overwriting the display values ​​continues. Only at the end of the screen layout, the image frame A (dt) is only for a short time dt fully visible. Specifically, this problem will be visible in the image display in 3D, the display device on the same image matrix must display two images, one for the left eye and one for the right eye. A shutter glasses in synchronization with the displayed image can be only one of their glasses will be transparent, so that the images are alternately addressed the left or right eye. The time dt, in which the shutter glasses is switched to be determined very accurately, in which all pixels of the new image to be displayed are shown complete, the next image has not yet begun. Here, ghost images can arise if the information is visible for an eye, which are intended for the other eye, such as the next image frame B (t + T) when the image change was made too late. The time in which the entire image frame A (dt) is available, is very short. Therefore, the display device with increased brightness needs to radiate, so that the viewer in the short time dt can perceive the image information, which can lead to an increase in power consumption.

The steps of the method of the invention for imaging are shown schematically in Figure 5 on the whole image matrix and in Figure 6 the example of a line Z of the image matrix M. Here, display values ​​for the image points of an image frame A are sequentially stored line by line Z Z, in a first memory 50th The pixels are only activated according to the invention by a control unit 70 simultaneously when all readings of the next frame period for complete image matrix in the memory 50 are included. The display values ​​12 of the image frame A is written into the memory 50, wherein a memory element 51 is provided for each liquid crystal molecule. The current image information on the display element is not changed. After completion of the writing operation, the display values ​​are 12 of the image frames A transferred simultaneously to all pixels by a driving unit 70 via an electrode layer 30th The drive unit 70 has here driving circuits 71 for each liquid crystal molecule.

Thus, multiple images to be completely avoided in the inventive imaging. In addition to produce a 3D effect can be made more accurate synchronization. The picture frame shown is not changed within a time between image changes. The time in which a lens is opened, thus can be increased.

REFERENCE CHARACTERS list

I display device

10 display element

II pixels

12 readings

20 carrier plates

21 insides of the outer plates 20

22 outside of the outer plates 20

30 electrode layers

40 polarizers

First memory 50

51 storage elements

60 Lighting panel

70 control unit

71 drive circuits

80 alignment layer

90 color filter layer

T frame period

T + 1 subsequent image period

A picture frame of the image period T

B picture frame, the subsequent frame period T + 1

M image matrix

S columns of the image matrix M

Z rows of the image matrix M

Claims

P atentanspr ü che
1 . A display device (1) for image display of TV or computer with
two carrier plates (20), said at least one carrier plate (20) having an electrode layer (30) which drives a display element (10), wherein the display element (10) an image matrix (M) of picture elements (1 1), which in horizontal rows (Z) and vertical columns (S) are arranged,
characterized,
that the electrode layer (30) comprises a first memory (50) in the display values ​​(12) of image frames (A, B) for the pixels (1: 1) successively row (Z) can be stored by line (Z + 1),
and in that the pixels (1: 1) are controlled simultaneously, if all indication values ​​(12) is a frame period (T, T + 1) for the entire image matrix (M) in the first memory (50) complete.
2. Display device (1) according to claim 1,
characterized,
that the memory (50) comprises a memory array of memory elements (51), wherein each pixel (1: 1) is assigned a storage element (51).
3. Display device (1) according to claim 1 or 2,
characterized,
that the memory elements (51) as capacitors, transistors, or superconducting magnetic memory elements are formed.
4. Display device (1) according to any one of the preceding claims,
characterized,
that a second memory is provided, (B) temporarily to the display values ​​(12) for a new picture frame of a subsequent frame period (T + 1), while the first memory (50) the image frame (A) of a previous frame period (T) drives.
5. Display device (1) according to any one of the preceding claims,
characterized,
that the first memory (50) comprises a control unit (70)
Drive circuits (71) for each liquid crystal molecule (1: 1), wherein in particular the control unit (70) all display values ​​(12) of a completely stored image frames (A, B) of a frame period (T, T + 1) to the liquid crystal molecules (1: 1) hands simultaneously.
6. Display device (1) according to any one of the preceding claims,
characterized,
that an image frame (A) for a left eye and a picture frame (B) for a right eye sequentially displayed, the image frame (A) to the left eye and the image frame (B) are addressable by means of a shutter glasses to the right eye, to create a 3D effect.
7. Display device (1) according to any one of the preceding claims,
characterized,
that the image dots (1: 1) as the liquid crystal molecules (1: 1) or a ferroelectric liquid crystal molecules (1: 1) are formed, wherein in particular the carrier plates (20) are constructed as glass plates (20).
8. A display device (1) according to claim 7,
characterized,
that the liquid crystal molecules (1 1) can be aligned by applying a voltage by means of the electrode layer (30) to form an image frame (A, B) of a frame period (T, T + 1) through the image matrix (M).
9. A display device (1) according to one of the preceding claims,
characterized,
that the display device (1) is an LCD screen, which in particular is for viewing 3D images.
- 2 -
10. A display device (1) according to one of the preceding claims,
characterized,
two polarizers (40), in particular on the outer sides of the support plates (20) are provided which are constructed as polarization filters and having different directions of polarization, in particular, whose polarization directions are rotated by 90 °, preferably by 180 °, or with particular preference 270 ° to each other ,
1. 1 A display device (1) according to one of the preceding claims,
characterized,
that the carrier plates (20) have at least one orientation layer (80) to force the liquid crystal molecules (1: 1) in a predefined direction, which corresponds in particular to the polarization directions of the nearest polarizers (40).
12. A display device (1) according to one of the preceding claims,
characterized,
that at least one, especially two compensating films are disposed on the outer sides of the display element (10) to compensate for a color separation of the display element (10) illuminated by light.
13. A display device (1) according to one of the preceding claims,
characterized,
that a color filter layer (90) is provided to image in an RGB color space, three primary colors red, green and blue to produce a colored image.
14. A display device (1) according to one of the preceding claims,
characterized,
that adjacent one of the carrier plates (20) comprises a lighting plate (60) is arranged to actively illuminate the display element (10) or passive illuminate with the reflected light of a light source.
- 3 -
15. A display device (1) according to one of the preceding claims,
characterized,
that a reinforcement plate the memory elements, in particular capacitors for each pixel (1 1) is arranged on the display element (10), in order to maintain the charge of the image points (1 1) during a frame period (T, T + 1).
16. A display device (1) according to one of the preceding claims,
characterized,
that the pixels (1: 1) are designed as OLEDs.
17. A method of image display for TV or computer by means of two support plates (20), said at least one carrier plate (20) having an electrode layer (30) which drives a display element (10), wherein the display element (10) an image matrix (M) from pixels (1: 1), which in horizontal rows (Z) and vertical columns (S) are arranged,
characterized,
that the image formation comprises a first step in which indication values ​​(12) of image frames (A, B) for the pixels (1: 1) sequentially line (Z) are stored by line (Z + 1) in a first memory (50),
and a second step, wherein the picture elements (1 1) are driven simultaneously when the memory operation for all the display values ​​(12) of a frame period (T, T + 1) for the entire image matrix (M) in the first memory (50) is complete ,
18. The method according to claim 17,
characterized,
that the display values ​​(12) of image frames (A, B) are stored in a memory array of the memory (50), wherein each pixel (1: 1) a storage element (51) is assigned.
- 4 -
19. A method according to any one of claims 17 or 18,
characterized,
that the display values ​​(12) for a new picture frame (B) are latched to a frame period (T + 1) in a second memory while the first memory (50) an image frame (A) of a previous frame period (T) drives.
20. The method according to any one of the preceding claims,
characterized,
that the display values ​​(12), are passed simultaneously through a control unit (70) to the pixels (1: 1) of image frames (A, B) which are completely stored in the memory (50), wherein the control unit (70) drive circuits (71 ) (for each pixel 1 1).
21st Method according to one of the preceding claims,
characterized,
that an image frame (A) for a left eye and a picture frame (B) are successively displayed for a right eye, and the image frame (A) to the left eye and the image frame (B) are addressed to the right eye using shutter glasses to create a 3D effect.
22. The method according to any one of the preceding claims,
characterized,
that the image dots (1: 1) as the liquid crystal molecules or ferroelectric liquid crystal molecules, or OLEDs are formed.
23. A method of image representation according to one of claims 17 to 22 having a display device (1) according to one of claims 1 to sixteenth
- 5 -
24. System for displaying 3D images to a display device according to any one of claims 1 to 16, which is operated by a method according to any one of claims 17 to 22, and shutter glasses, the image frame (A) a left eye and an image frame (B) addressed to a right eye alternately to produce a 3D effect.
- 6 -
PCT/EP2011/067101 2010-09-30 2011-09-30 Display apparatus with simultaneous refreshing of all pixels WO2012042016A1 (en)

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WO (1) WO2012042016A1 (en)

Citations (2)

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US5945972A (en) * 1995-11-30 1999-08-31 Kabushiki Kaisha Toshiba Display device
WO2007021458A1 (en) * 2005-08-09 2007-02-22 Sin-Min Chang Method and apparatus for stereoscopic display employing an array of pixels each employing an organic light emitting diode

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Publication number Priority date Publication date Assignee Title
JP3800404B2 (en) * 2001-12-19 2006-07-26 株式会社日立製作所 Image display device
GB0400209D0 (en) * 2004-01-07 2004-02-11 Koninkl Philips Electronics Nv Light emitting display devices
CN101415126A (en) * 2007-10-18 2009-04-22 深圳Tcl新技术有限公司 Method for generating three-dimensional image effect and digital video apparatus

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US5945972A (en) * 1995-11-30 1999-08-31 Kabushiki Kaisha Toshiba Display device
WO2007021458A1 (en) * 2005-08-09 2007-02-22 Sin-Min Chang Method and apparatus for stereoscopic display employing an array of pixels each employing an organic light emitting diode

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

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