EP2097893A1 - Method for addressing an lcd display in colour sequential mode - Google Patents
Method for addressing an lcd display in colour sequential modeInfo
- Publication number
- EP2097893A1 EP2097893A1 EP07857922A EP07857922A EP2097893A1 EP 2097893 A1 EP2097893 A1 EP 2097893A1 EP 07857922 A EP07857922 A EP 07857922A EP 07857922 A EP07857922 A EP 07857922A EP 2097893 A1 EP2097893 A1 EP 2097893A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- color
- display
- sequence
- colored
- random
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
Definitions
- the present invention relates to a liquid crystal display of the sequential color addressing type, and more particularly to a method of addressing such a display. It is particularly applicable to the full range of direct view displays, ranging from cell phone screens to large screens for television.
- color sequential displays An interest of color sequential displays is the possibility of producing color display systems for direct vision screens without color filters, that is to say without color information attached to an image point (pixel).
- image point Each image point is colorless and a light box is used which successively illuminates the display in the three primary colors, typically red, green and blue.
- the addressing then comprises several color frames per complete video frame. In the time of each color frame, all the pixels of the matrix are addressed to display the video information corresponding to the associated primary color, and the light box illuminates the display in the corresponding primary color.
- FIG. 1 A corresponding color sequence is illustrated in FIG. 1:
- F1 for example, there are three colored fields, red, green and blue, in the example fRi, fd and f ⁇ 1, respectively.
- the red, green, blue color sequence is repeated periodically at the frequency of the complete video frames.
- the frame rate is 60Hz giving a TO duration of 16.667ms for each video frame.
- a known problem of these displays is the so-called color break-up problem, due to the stabilization time of the liquid crystal, which results in a noticeable display defect for the eye of an observer. Indeed, because of the ability of the eye to distinguish very fast movements, it is able to distinguish the succession of different colored frames. In particular, an observer perceives Particularly visible color flashes on a white image when the screen is operating at low frequency or when moving the head in front of the screen. While the eye accepts without being too embarrassed a complete refresh of the images at 50Hz, a color change at the frequency of 150Hz can be detected in cases of observation such as those mentioned above.
- the perception by the eye of this display defect takes the form of a succession of bands or colored fringes, typically the succession of primary colors, as illustrated schematically in Figure 1, with a spatial frequency which depends on the frequency of refresh the image.
- the eye perceives a periodic succession of a red band, a green band, and a blue band.
- the invention relates to a method for addressing a color sequential liquid crystal display, from a video sequence of successive color frames, which comprises a step of random or pseudo-random arrangement of said colored fields of said sequence.
- video for providing a sequence of display of color frames to be applied to said display, said random arrangement comprising a random or pseudo-random arrangement of the display order of said color frames, and / or a random or pseudo-random assignment duration of each of said colored fields.
- said random arrangement is such that said display sequence comprises a succession of packets of n colored frames, n being at least equal to 3, each packet being associated with a pair of primary colors, comprising a first primary color and a second primary color, the odd-rank colored fields in a packet being color fields corresponding to said first color, the even-rank colored fields in the packet being colored fields corresponding to said second color.
- the power level of light emitted in the lighting phase of a colored frame is advantageously random.
- the light power level of each colored frame is such that the light power reconstituted on the display corresponds to an achromatic white.
- the invention also relates to a liquid crystal display of the sequential color addressing type, comprising an addressing device implementing an addressing method according to the invention.
- FIG. 1 already described illustrates a colored sequence according to the state of the art
- FIG. 2 already described illustrates the phenomenon of cleavage of colors as perceived by the eye of an observer
- FIG. 3 illustrates a sequence of colored frames constituted by a addressing method according to the invention
- FIG. 4 illustrates a display with an addressing device for implementing a method according to the invention
- FIG. 5 illustrates a sequence of colored fields according to a first embodiment of the invention
- FIG. 6 illustrates a sequence of colored fields according to a variant of the first embodiment
- FIG. 7 illustrates a sequence of colored fields according to a second embodiment of the invention
- FIG 8 is a general block diagram of a method of addressing an LCD display according to the invention.
- cyan blue Bc is represented in dark gray, purple M in light gray and yellow Y in medium gray.
- FIGS. 3 and 4 illustrate an addressing method according to the invention, in which the colored frames of a video sequence SV are arranged randomly or almost randomly to constitute a display sequence SD of colored frames applied to a display 1
- This random or pseudo-random arrangement according to the invention applies to the order of display of the colored fields on the display 1, and / or to the duration of each of the colored fields.
- the display sequence SD constituted according to the invention comprises a series of colored frames fRi, fd, fBi, fG2, fB2, fR2, fG3, fR3, fB3, corresponding to a random succession of the primary colors according to the sequence RGBGBRGRB , each corresponding colored frame having a specific duration, chosen randomly, in the example tii, tg1, tb1, tg2, tb2, tr2, tg3, tr3, tb3 ..., respectively.
- a complete frame of a color video image to be displayed comprises three successive color video frames, always in the same order, typically a red video frame, then green then blue.
- An addressing device processes the complete video frames with their color video frames presented in order on the display. For each color video frame, the addressing device reads the corresponding data to be displayed to control the pixels of the array in an appropriate write phase, and the array is illuminated in the corresponding primary color.
- the display device arranges the color video frames of one or more complete video frames to form an SD sequence of color frames in which the primary colors occur in random sequence, and / or which the durations of the colored frames are random.
- Fk (k integer) the complete video frames transmitted by an input signal of a video sequence SV, containing the images to be displayed.
- FRk, fGk, fBk are the red, green, blue video frames of a video frame Fk of the video sequence SV.
- a display device constitutes a display sequence SD applied to the display 1, from the colored fields of the received video sequence.
- This constitution of an SD display sequence according to the invention consists in presenting the color video frames in a random order and / or in assigning them a frame time, or duration, random.
- the display sequence SD according to the invention can be performed as described below.
- a video signal to be displayed is received in the form of an SV video sequence of video frames.
- the display device 10 comprises means
- an SD display sequence of colored fields for example the SD sequence described in FIG.
- k successive video frames F1 to Fk (k nonzero integer) of the sequence are stored for example in a buffer 12 fed by the incoming signal SV, to allow the constitution of a sequence display according to the invention.
- the buffer memory is fed by 4 successive video frames, F1 to F4, which respectively comprise the following color frames: fRi, fGi, f ⁇ 1 for F1, fR2, fG2, fB2 for F2, fR3, fG3 , fB3 for F3, fR4, fG4, fB4 for F4.
- the display sequence SD can be constituted as filling of the input buffer 12 by the frames of the video sequence SV, and it can itself be stored as a buffer buffer 13 as illustrated, or supply directly to a control device 14 of the LCD display 1.
- the colored fields of the display sequence SD are thus successively displayed on the LCD display 1.
- the light box 2 is controlled synchronously to illuminate the LCD display in correspondence with the display of the current colored frame of the SD sequence, during the frame time allocated to this colored frame, which can be fixed or random according to the implementation of the invention.
- each packet of three colored fields of the display sequence SD corresponds to the colored fields of a video frame Fk of the video sequence SV, but presented in a random order with respect to their natural order in the sequence original SV video, and / or being each associated with a random frame time.
- the means 1 1 constituting the display sequence SD take the first complete video frame F1 of the video sequence SV stored in the buffer memory, and constitute a first packet p1 of the SD sequence by drawing a random order of display of the three color frames fRi, fGi, f ⁇ 1 of this video frame F1; then the means 1 1 pass to the next complete video frame F2, to form a second packet p2 with its colored frames fR2, fG2, f ⁇ 2 ... and so on.
- the display sequence SD thus consists of the sequence of packets p1, p2, ...
- the invention is not limited to this embodiment of an SD display sequence. More generally, the display sequence SD can be constituted from the colored fields of one or more video frames Fk. Such embodiments of a display sequence SD from the color frames of several frames F1 to Fk of an input video sequence SV are illustrated in particular in FIGS. 5 and 6.
- the buffer memory input 12 will contain at least k frames from which will be constituted a sequence of packets of the display sequence.
- the implementation of the invention must meet different constraints, to fully produce all its effects and not degrade the performance of the display. In particular, three constraints must be taken into account:
- the duration of a colored frame of the display sequence SD must be sufficiently small so as not to mark the eye of an observer in a lasting manner.
- the duration of a colored frame of the display sequence SD must not be too short to be compatible with the performance of the liquid crystal on the active matrix. In particular, it must be greater than the stabilization time of the liquid crystal, a typical value of which is of the order of a millisecond. the color balance must be preserved to obtain an achromatic white. Typically, this is achieved with a light power reconstituted on the display including 60% green, 20% red and 20% blue.
- the first two constraints impose an interval of possible values for the colored field times, with a minimum value T m ⁇ n (second constraint) and a maximum value T max (first constraint).
- T m ⁇ n second constraint
- T max first constraint
- the implementation of the invention thus presupposes the implementation of random rules with color selection constraints and / or frame times, which will give the mechanism for arranging the colored frames of the video sequence received SV to form the sequence of SD display according to the invention.
- the control mode of the level of The luminous power of the light box is such that the luminous power reconstituted on the display corresponds to an achromatric white.
- Figures 5 to 7 illustrate examples of implementations of pseudo-random arrangements according to the invention, in which a pseudo-random succession of colors is obtained. These examples are not limiting.
- the SD display sequences given in examples are formed from the SV input video sequence illustrated in FIGS. 1 and 4.
- the display sequence SD of frames stained according to the invention is constituted in such a way that the color breaks advantageously occur in the secondary colors yellow Y (green + yellow), red magenta M (blue + red), or blue cyan Bc (blue + green) . These breaks in the secondary colors are less noticeable for the eye of an observer than the primary color breaks.
- FIG. 5 illustrates a corresponding first embodiment.
- two successive packets are associated with a different pair of primary colors.
- the color of the n-rank colored frame of a packet of the display sequence SD and the color of the rank 1 colored frame of the next packet of said sequence are different.
- a succession of 3 color frames is selected on the basis of a pair of first and second primary colors selected from six possible pairs (R 1 G), (G, R), (G 1 B), (B 1 G), (R 1 B) or (B, R).
- the pair (R, G) is associated with the packet p1, the first color R of the pair giving the color of the first and the third of the three colored fields of the packet p1, and the second color G giving the color of the second colored frame of the packet.
- the means 11 will then select corresponding color frames in the video sequence SV, according to their order of chronological appearance and according to the desired colors, which gives in the example for the packet p1 for the first colored frame, fRi, for the second colored field, fd, and for the third colored field, fR2.
- the following packets p2, p3 of the subsequence are constituted according to the same principle: in the example, the second packet p2 corresponds to the selection of the pair of primary colors (B, R) and is constituted with fBi frames, fR3 and fB2 of the SV sequence, associated with this color selection.
- the third packet p3 corresponds to the selection of the primary color pair (G, B) and is constituted with the frames fG2, fB3 and fG3 of the sequence SV, associated with this selection of colors.
- the succession of colors imposed by the selection of pairs are constituted according to the same principle: in the example, the second packet p2 corresponds to the selection of the pair of primary colors (B, R) and is constituted with fBi frames, fR3 and fB2 of the SV sequence, associated with this color selection.
- the third packet p3 corresponds to the selection of the primary color pair (G, B) and is constituted with the frames fG2,
- the random pattern constituted in the example is the following: RGRGBRBRBGBG.
- FIGS. 5 and 6 The embodiment of the invention which has just been described in relation to FIGS. 5 and 6 has the advantage of allowing a simple practical implementation, requiring limited memory means.
- Fig. 7 illustrates another embodiment of a display sequence SD according to the invention from the input video sequence SV.
- use is advantageously the spatial periodicity of the phenomenon of rupture of the primary colors to remove, an order of magnitude of the spatial frequency to be used is 10 ⁇ eme 100 ⁇ eme, millimeters or centimeters.
- the colored fields are arranged in such a way that during the time of the colored frame in first position in each packet p1, p2 and p3, there is red for one frame, green for another and blue for another, or globally a white W. This is reproduced for each color frame position of the packets, c ' ie the second positions and the third positions. This removes the effect of spatial periodicity of the colors. In the illustrated example, there are thus in positions 1 st successively red, green and blue, in two positions ⁇ emes, green, blue and red and in positions 3 ⁇ emes, blue, red and green .
- the display sequence SD may advantageously be formed by repetition of a random pattern, which is here given by the succession of colors on the sequence of the three successive packets p1 to p3, either: RGBGBRBRG. This random pattern is then repeated from one subsequence to another; SD- t, SD 2 , ...
- Each display sub-sequence can advantageously be constituted from the colored fields of 3 successive complete video frames of the video sequence SV, such as F1, F2, F3.
- the SD sequence is thus formed by periodic repetition of a random pattern, for example all 9 colored fields (FIGS. 5 and 7) or all 12 colored fields (FIG. 6)
- a constraint on the frequency of repetition of the random pattern must be applied, in order to avoid flicker or flicker effects: the frequency of repetition of the random pattern must be higher than the frequency for which this flicker appears, a frequency which is noted ff ⁇ c ker-
- an arrangement of the display sequence SD from the video sequence SV according to the invention comprises an allocation of a random duration (frame time) to each of the colored fields of the sequence.
- a random duration frame time
- the colored fields can be chained completely randomly in the SD display sequence.
- the preceding constraints are written a little differently for the color balance. This is particularly the case in displays whose addressing method is based on a breakdown of the characteristic time of each frame color frame in three periods:
- FIG. 8 gives a general overview of an addressing method with an arrangement step 100 of the colored frames according to the invention: after a parameterization 100.1 of the formation of the display sequence (type of arrangement (random succession colors and / or random display duration), periodicity of a random pattern, random luminous power), the colored fields of the video sequence SV received at the input are re-arranged in a step 100.2 of forming the sequence of SD display, according to these chosen implementation options, and imposed constraints: an SV display sequence is formed in a step 100.2, if necessary with the concurrence 100.3 of a pseudo-random generator to provide characteristic times colored fields: frequency of repetition of a random pattern, minimum and maximum values of durations, color balance. An SD display sequence is then output, which is applied to the LCD display 1, associated with a corresponding CBAL control mode of the light box 2: color succession, lighting duration, lighting power.
- a parameterization 100.1 of the formation of the display sequence type of arrangement (random succession colors and / or random display duration), periodicity of a random pattern,
- the invention which has just been described by means of a few nonlimiting examples makes it possible to improve the display quality of liquid crystal displays of the sequential color addressing type, and is applicable to the whole range of direct vision screens.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0611257A FR2910684B1 (en) | 2006-12-22 | 2006-12-22 | METHOD FOR ADDRESSING A LIQUID CRYSTAL DISPLAY IN COLOR SEQUENTIAL MODE. |
PCT/EP2007/064301 WO2008077873A1 (en) | 2006-12-22 | 2007-12-20 | Method for addressing an lcd display in colour sequential mode |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2097893A1 true EP2097893A1 (en) | 2009-09-09 |
EP2097893B1 EP2097893B1 (en) | 2018-08-08 |
Family
ID=38255248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07857922.4A Not-in-force EP2097893B1 (en) | 2006-12-22 | 2007-12-20 | Method for addressing an lcd display in colour sequential mode |
Country Status (4)
Country | Link |
---|---|
US (1) | US8305317B2 (en) |
EP (1) | EP2097893B1 (en) |
FR (1) | FR2910684B1 (en) |
WO (1) | WO2008077873A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2934919B1 (en) * | 2008-08-08 | 2012-08-17 | Thales Sa | FIELD EFFECT TRANSISTOR SHIFT REGISTER |
MX2012012034A (en) | 2010-04-16 | 2013-05-30 | Flex Lighting Ii Llc | Front illumination device comprising a film-based lightguide. |
WO2011130715A2 (en) | 2010-04-16 | 2011-10-20 | Flex Lighting Ii, Llc | Illumination device comprising a film-based lightguide |
US9275585B2 (en) * | 2010-12-28 | 2016-03-01 | Semiconductor Energy Laboratory Co., Ltd. | Driving method of field sequential liquid crystal display device |
WO2016166199A1 (en) * | 2015-04-14 | 2016-10-20 | Koninklijke Philips N.V. | Device and method for improving medical image quality |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3824459B2 (en) * | 1999-11-08 | 2006-09-20 | 富士通株式会社 | Liquid crystal display |
JP3956337B2 (en) * | 2001-03-16 | 2007-08-08 | オリンパス株式会社 | Frame sequential color display |
JP4068317B2 (en) * | 2001-07-27 | 2008-03-26 | Necディスプレイソリューションズ株式会社 | Liquid crystal display |
JP3710455B2 (en) * | 2003-04-30 | 2005-10-26 | 株式会社タムロン | Image display device and light source unit for image display device |
US7397484B2 (en) * | 2005-01-11 | 2008-07-08 | Tpo Displays Corp. | Method for displaying an image |
FR2894370B1 (en) * | 2005-12-07 | 2008-06-06 | Thales Sa | SEQUENTIAL MATRIX DISPLAY WITH LIQUID CRYSTAL COLOR |
-
2006
- 2006-12-22 FR FR0611257A patent/FR2910684B1/en not_active Expired - Fee Related
-
2007
- 2007-12-20 WO PCT/EP2007/064301 patent/WO2008077873A1/en active Application Filing
- 2007-12-20 US US12/520,621 patent/US8305317B2/en active Active
- 2007-12-20 EP EP07857922.4A patent/EP2097893B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2008077873A1 * |
Also Published As
Publication number | Publication date |
---|---|
US8305317B2 (en) | 2012-11-06 |
EP2097893B1 (en) | 2018-08-08 |
FR2910684A1 (en) | 2008-06-27 |
FR2910684B1 (en) | 2009-04-17 |
WO2008077873A1 (en) | 2008-07-03 |
US20100019999A1 (en) | 2010-01-28 |
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