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EP0382567A2
Expired / Lapsed
EP
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Liquid crystal display device and driving method therefor
Assignee: Sharp Corp
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Filing: 1990-02-09
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Granted: —
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Expires: 2010-02-09
Abstract
Abstract A liquid crystal display device receiving television signals formed in accordance with interlace scanning method for displaying images is disclosed. Numbers of the rows of pixels and of scan signal lines on a liquid crystal panel is increased to be the same as the number of valid scan lines of 1 frame of television signals. The original video signals to be inputted to the device are compressed to 1/2, and interpolating signals are added to every line of the compressed signals to form pseudo video signals. Shift register operation of a scan driver and the segment driver are done twice as fast as that in the conventional device, and start timing of the shift register operation of the segment driver is controlled to be shifted by 1/2 horizontal scanning period between the even field and odd field, while the pseudo video signals are applied to the segment driver. Consequently, to the rows of pixels to which original video signals are applied in the even field and to the rows of pixels to which interpolating signals are applied in the even field, interpolating signals and original video signals are applied in the odd field, respectively. Consequently, display can be carried out seemingly in accordance with the interlace scanning method.
Inventors
- 👤 Toshio Matsumoto
- 👤 Shuhei Yasuda
- 👤 Tokutarou Kusada
- 👤 Nobuyoshi Nagashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:13
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127; G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G2310/00; G09G2310/02; G09G2310/0202; G09G2310/0205; G09G2310/0224; G09G3/3614
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
250 words
A liquid crystal display device, comprising: converting means (14, 39) for converting original video signals into pseudo video signals by time compressing original video signals of 1 horizontal scanning period of interlace system to 1/2, and by interpolating, between each of the compressed signals, a signal which is similar to or the same as any of these signals; a liquid crystal panel including scan signal lines (5, 36) the number of which being substantially equal to the number of valid scan lines in 1 frame of television signals, and a plurality of rows of liquid crystal pixels each connected to said scan signal lines (5, 36), each of said rows (22) of liquid crystal pixels including a plurality of liquid crystal pixels; scan driver means (3, 34) operating at a frequency twice as much as horizontal scanning frequency of said original video signals for successively scanning and driving said scan signal lines on said liquid crystal panel (1); timing control means (9, 45) for shifting operation timing of said scan driver means (3, 34) in a first field constituting 1 frame of said original video signals from operation timing of said scan driver means in a second field constituting said 1 frame by one half of the horizontal scanning period of said original video signals; and segment driver means (2, 33) responsive to said pseudo video signals for driving said liquid crystal pixels in a frequency cycle twice as much as the horizontal scanning frequency of said original video signals.
Claim 2
Dependent Claim
250 words
A liquid crystal display device, comprising: converting means (14, 39) for converting original video signals into pseudo video signals by time compressing original video signals of 1 horizontal scanning period of interlace system to 1/2, and by interpolating, between each of the compressed signals, a signal which is similar to or the same as any of these signals; a liquid crystal panel including scan signal lines (5, 36) the number of which being substantially equal to the number of valid scan lines in 1 frame of television signals, and a plurality of rows of liquid crystal pixels each connected to said scan signal lines (5, 36), each of said rows (22) of liquid crystal pixels including a plurality of liquid crystal pixels; scan driver means (3, 34) operating at a frequency twice as much as horizontal scanning frequency of said original video signals for successively scanning and driving said scan signal lines on said liquid crystal panel (1); timing control means (9, 45) for shifting operation timing of said scan driver means (3, 34) in a first field constituting 1 frame of said original video signals from operation timing of said scan driver means in a second field constituting said 1 frame by one half of the horizontal scanning period of said original video signals; and segment driver means (2, 33) responsive to said pseudo video signals for driving said liquid crystal pixels in a frequency cycle twice as much as the horizontal scanning frequency of said original video signals.
Claim 3
Dependent Claim
133 words
A liquid crystal display device according to claim 1, wherein said original video signals are analog signals: and said converting means (39) includes analog/digital converting means (40) for converting said original video signals into digital signals; storing means (41) for storing digital signals converted by said analog/digital converting means for every horizontal scanning period of the original video signals; means (41) for successively reading digital signals of one horizontal scanning period twice in one horizontal scanning period from said storing means (41); inverting means (42, 45, 46) for inverting polarity of the digital signals read by said reading means (41) in every 1/2 horizontal scanning period of the original video signals of; and digital/analog converting means (43) for converting the digital signals outputted from said inverting means (42, 45, 46) into analog signals.
Claim 4
Dependent Claim
88 words
A liquid crystal display device according to claim 2, wherein said inverting means (42, 45, 46) comprises a first path (46) for directly applying the digital signals read by said reading means (41) to said digital/analog converting means (43); a second path (42, 46) for applying the digital signals read by said reading means (41) with the polarity inverted to said digital/analog converting means (43); and means (45, 46) for alternately activating said first and second paths in every 1/2 horizontal scanning period of the original video signals.
Claim 5
Dependent Claim
172 words
A liquid crystal display device for driving liquid crystal pixels in response to original video signals of interlace specification, comprising: a liquid crystal panel (1) including scan signal lines the number of which being substantially equal to the number of valid scan lines of 1 frame of television signals, and a plurality of rows of liquid crystal pixels each connected to said scan signal lines, each of said rows (22) of liquid crystal pixels including a plurality of liquid crystal pixels; scan signal line driving means (50, 60) for successively driving pairs of adjacent said scan signal lines (80) of a first combination in a first field out of first and second fields constituting 1 frame, and for successively driving pairs of adjacent said scan signal lines in a different combination in said second field; and pixel driving means (30, 40, 110, 120) for driving, responsive to said original video signals, the liquid crystal pixels connected to said scan signal lines (80) driven by said scan signal line driving means (50, 60).
Claim 6
Dependent Claim
172 words
A liquid crystal display device for driving liquid crystal pixels in response to original video signals of interlace specification, comprising: a liquid crystal panel (1) including scan signal lines the number of which being substantially equal to the number of valid scan lines of 1 frame of television signals, and a plurality of rows of liquid crystal pixels each connected to said scan signal lines, each of said rows (22) of liquid crystal pixels including a plurality of liquid crystal pixels; scan signal line driving means (50, 60) for successively driving pairs of adjacent said scan signal lines (80) of a first combination in a first field out of first and second fields constituting 1 frame, and for successively driving pairs of adjacent said scan signal lines in a different combination in said second field; and pixel driving means (30, 40, 110, 120) for driving, responsive to said original video signals, the liquid crystal pixels connected to said scan signal lines (80) driven by said scan signal line driving means (50, 60).
Claim 7
Dependent Claim
127 words
A liquid crystal display device according to claim 4, wherein said scan signal line driving means (50, 60) comprises: first scan driver means (50) connected to odd numbered ones of said scan signal lines (80) for successively scanning and driving these signal lines one by one, second scan driver means (60) connected to even numbered ones of said scan signal lines (80) for successively scanning and driving these signal lines one by one, and controlling means (120) for simultaneously starting operations of said first and second scan driver means (50, 60) in said first field and for making different operation start timing of said first scan driver means (50) from that of said second scan driver means (60) by 1 horizontal scanning period in said second field.
Claim 8
Dependent Claim
75 words
A liquid crystal display device according to claim 4, wherein said pixel driving means (30, 40, 110, 120) comprises inverting means (110, 120) for inverting polarity of said original video signals in every 1 frame and in every 1 horizontal scanning period, and means (30, 40) for applying an output from said inverting means to liquid crystal pixels connected to said scan signal lines (80) driven by said scan signal line driving means (50, 60).
Claim 9
Dependent Claim
49 words
A liquid crystal display device according to claim 6, wherein said inverting means (110, 120) comprises output means (110) for outputting said original video signals with the polarity inverted, and controlling means (120) for controlling timing of inverting polarity of said original video signals in said output means (110).
Claim 10
Dependent Claim
172 words
A liquid crystal display device according to claim 7, wherein said controlling means (120) comprises means (210) for separating and extracting, from composite synchronizing signals including a horizontal synchronizing signal and a vertical synchronizing signal corresponding to said original video signals, said horizontal synchronizing signal and said vertical synchronizing signal independently; first forming means (220) for forming a first signal whose polarity is inverted in every 1 horizontal scanning period by dividing said horizontal synchronizing signal separated and extracted by said separating and extracting means; second forming means (230, 240) for forming a second signal whose polarity is inverted in every 1 frame period by dividing into two said vertical synchronizing signal separated and extracted by said separating and extracting means (210); and third forming means (250) for forming a third signal whose polarity is inverted in every 1 horizontal scanning period and in every 1 frame period, based on said first signal formed by said first forming means (220) and on said second signal formed by said forming means (230, 240).
Claim 11
Dependent Claim
59 words
A liquid crystal display device according to claim 8, wherein said first forming means (220) comprises one flipflop circuit, and said second forming means (230, 240) comprises a first flipflop circuit (230) for dividing once said vertical synchronizing signal, and a second flipflop circuit (240) for once again dividing the vertical synchronizing signal divided by said first flipflop circuit.
Claim 12
Independent Claim
248 words
A method of driving a liquid crystal display device for driving a liquid crystal panel (1) having scan signal lines (80) the number of which being substantially equal to the number of valid scan lines of 1 frame of television signals, and a plurality of rows of liquid crystal pixels (22), each including a plurality of liquid crystal pixels each connected to said scan signal lines (5, 36), comprising the steps of: time-compressing signals of 1 horizontal scanning period of original video signals of interlace specification into 1/2; forming pseudo video signals by interpolating, between said compressed signals, a signal similar to or the same as any one of these signals; driving by successively scanning said scan signal lines by operating a scan driver (3, 34) at a frequency twice as much as the horizontal scanning frequency of said original video signals in a first field out of first and second fields constituting 1 frame of said original video signals; driving by scanning said scan signal lines (5, 36) by operating said scan driver (3, 34) at a timing shifted from that in said first field by 1/2 time period of the horizontal scan period of said original video signals in said second field; and driving said liquid crystal pixels by operating, in response to said formed pseudo video signals, a segment driver (2, 33) at a frequency cycle twice as much as the horizontal scanning frequency of said original video signals, in said first and second fields.
Claim 13
Independent Claim
248 words
A method of driving a liquid crystal display device for driving a liquid crystal panel (1) having scan signal lines (80) the number of which being substantially equal to the number of valid scan lines of 1 frame of television signals, and a plurality of rows of liquid crystal pixels (22), each including a plurality of liquid crystal pixels each connected to said scan signal lines (5, 36), comprising the steps of: time-compressing signals of 1 horizontal scanning period of original video signals of interlace specification into 1/2; forming pseudo video signals by interpolating, between said compressed signals, a signal similar to or the same as any one of these signals; driving by successively scanning said scan signal lines by operating a scan driver (3, 34) at a frequency twice as much as the horizontal scanning frequency of said original video signals in a first field out of first and second fields constituting 1 frame of said original video signals; driving by scanning said scan signal lines (5, 36) by operating said scan driver (3, 34) at a timing shifted from that in said first field by 1/2 time period of the horizontal scan period of said original video signals in said second field; and driving said liquid crystal pixels by operating, in response to said formed pseudo video signals, a segment driver (2, 33) at a frequency cycle twice as much as the horizontal scanning frequency of said original video signals, in said first and second fields.
Claim 14
Independent Claim
142 words
A method of driving a liquid crystal display device for driving a liquid crystal panel (1) including scan signal lines (80) the number of which being substantially equal to the number of valid scan lines of 1 frame of television signals and a plurality of rows of liquid crystal pixels (22) including a plurality of liquid crystal pixels, each connected to said scan signal lines (80), comprising the steps of: successively driving pairs of adjacent said scan signal lines (80) of a first combination in a first field out of first and second fields constituting 1 frame, successively driving pairs of adjacent said scan signal lines (80) of a different combination in said second field; and driving the liquid crystal pixels connected to said scan signal lines (80) driven in response to said original video signals, in said first and second fields.
Claim 15
Independent Claim
142 words
A method of driving a liquid crystal display device for driving a liquid crystal panel (1) including scan signal lines (80) the number of which being substantially equal to the number of valid scan lines of 1 frame of television signals and a plurality of rows of liquid crystal pixels (22) including a plurality of liquid crystal pixels, each connected to said scan signal lines (80), comprising the steps of: successively driving pairs of adjacent said scan signal lines (80) of a first combination in a first field out of first and second fields constituting 1 frame, successively driving pairs of adjacent said scan signal lines (80) of a different combination in said second field; and driving the liquid crystal pixels connected to said scan signal lines (80) driven in response to said original video signals, in said first and second fields.
Claim 16
Dependent Claim
189 words
A liquid crystal display device for forming a picture from an input video signal representing a succession of picture frames, each comprising two interlaced fields, the device comprising a liquid crystal display screen comprising a multiplicity of display elements forming a matrix array having a number of lines equal to the number of scan lines in a frame of the video signal, and display drive means for receiving the video signal and controlling the display screen so that in any given frame all of the matrix lines of display elements are enabled in scan sequence in each said frame, the scan rate being twice the line scan rate represented in the video signal, wherein in one said field, the odd lines are driven with compressed segment signals derived from the part of the video signal for that one field and the even lines are driven using signals derived by interpolation and wherein in the other said field the even lines are driven with compressed segment signals derived from the part of the video signal for that other field and the odd lines are driven using signals derived by interpolation.
Claim 17
Dependent Claim
189 words
A liquid crystal display device for forming a picture from an input video signal representing a succession of picture frames, each comprising two interlaced fields, the device comprising a liquid crystal display screen comprising a multiplicity of display elements forming a matrix array having a number of lines equal to the number of scan lines in a frame of the video signal, and display drive means for receiving the video signal and controlling the display screen so that in any given frame all of the matrix lines of display elements are enabled in scan sequence in each said frame, the scan rate being twice the line scan rate represented in the video signal, wherein in one said field, the odd lines are driven with compressed segment signals derived from the part of the video signal for that one field and the even lines are driven using signals derived by interpolation and wherein in the other said field the even lines are driven with compressed segment signals derived from the part of the video signal for that other field and the odd lines are driven using signals derived by interpolation.
References Cited (Backward Citations)
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