EP0167408A2
Expired / Lapsed
EP
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Drive circuit for color liquid crystal display device
Assignee: Sharp Corp
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Filing: 1985-07-05
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Granted: —
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Expires: 2005-07-05
Abstract
Abstract A color liquid crystal display device which comprises picture element electrodes arranged in a matrix that is made up of the intersecting points of row electrodes and column electrodes, a 1st circuit board with switching elements that are connected to these picture element electrodes, a 2nd circuit board with opposing electrodes, a liquid crystal layer that is inserted in between the said 1st and 2nd circuit boards, a color filter with a specific pattern in between the said 1st and 2nd circuit boards, and a column electrode drive circuit that applies voltage corresponding to color arrangement of the color filter and the density of the display to the said column electrode. The column electrode drive circuit includes a sampling circuit which samples the momentary voltage corresponding to the display picture element out of the display signals that are input.
Inventors
- 👤 Makoto Takeda
- 👤 Kunihiko Yamamoto
- 👤 Nobuaki Matsuhashi.
- 👤 Hiroshi Take
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 22:06
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3607
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
123 words
A color liquid crystal display device comprising a first circuit board with multiple row electrodes and multiple column electrodes that intersect to form a matrix of picture element electrodes to which switching elements are connected; 2nd circuit board with opposing electrodes; a liquid crystal layer that is inserted in between the said 1st and 2nd circuit boards; color filters arranged in a specific pattern between the 1st and 2nd circuit boards; and a column electrode drive circuit that applies voltage to the said column electrode corresponding to the color filter color arrangement and display density; the column electrode drive circuit including a sampling circuit that samples the momentary voltage corresponding to the display picture elements out of the display signals that are input.
Claim 2
Dependent Claim
123 words
A color liquid crystal display device comprising a first circuit board with multiple row electrodes and multiple column electrodes that intersect to form a matrix of picture element electrodes to which switching elements are connected; 2nd circuit board with opposing electrodes; a liquid crystal layer that is inserted in between the said 1st and 2nd circuit boards; color filters arranged in a specific pattern between the 1st and 2nd circuit boards; and a column electrode drive circuit that applies voltage to the said column electrode corresponding to the color filter color arrangement and display density; the column electrode drive circuit including a sampling circuit that samples the momentary voltage corresponding to the display picture elements out of the display signals that are input.
Claim 3
Dependent Claim
92 words
Color liquid crystal display device of claim 1, wherein the sampling circuit comprises a sampling capacitance, with one end connected to the sampling capacitance, and the other ends individually connected to sampling analog switches for the respective red, green, blue display signal lines according to the color arrangement of the said color filters; a gate circuit to which a selection signal and display pattern signal are input in order to output signals that selectively open and close the sampling analog switch; and a shift register circuit to output a display pattern signals.
Claim 4
Dependent Claim
109 words
The color liquid crystal_display device of claim 1, wherein the sampling circuit comprises a sampling capacitance,a sampling analog switch with one end connected to the said sampling capacitor and the other ends individually connected to two out of the three display signal lines (red, green, blue) according to the color arrangement of the said color filters; a gate circuit to which color selection signals and display pattern signals are input in order to output a signal to selectively open and close one of the said sampling analog switches; and a shift register circuit to output a display pattern signal, with the output end connected to the said gate circuit.
Claim 5
Dependent Claim
58 words
A column electrode drive circuit to apply a voltage corresponding to the color arrangement of the color filter and the density of the display to the column electrodes of the color liquid crystal display device, comprising a sampling circuit to sample the momentary voltage corresponding to the display picture elements out of the display signals that are input,
Claim 6
Dependent Claim
58 words
A column electrode drive circuit to apply a voltage corresponding to the color arrangement of the color filter and the density of the display to the column electrodes of the color liquid crystal display device, comprising a sampling circuit to sample the momentary voltage corresponding to the display picture elements out of the display signals that are input,
Claim 7
Dependent Claim
85 words
the sampling circuit comprising a sampling capacitor; a sampling analog switch with one end connected to the said sampling condensor and the other ends individually connected to the respective red, green and blue display signal lines according to the color arrangement of the said color filters; a gate circuit to which color selection signals and display pattern signals are input to in turn output signals to selectively open and close the said sampling analog switches; and a shift register circuit to output display pattern signals.
Claim 8
Dependent Claim
85 words
the sampling circuit comprising a sampling capacitor; a sampling analog switch with one end connected to the said sampling condensor and the other ends individually connected to the respective red, green and blue display signal lines according to the color arrangement of the said color filters; a gate circuit to which color selection signals and display pattern signals are input to in turn output signals to selectively open and close the said sampling analog switches; and a shift register circuit to output display pattern signals.
Claim 9
Dependent Claim
151 words
A column electrode drive circuit to apply voltage according to the color arrangement of the color filter and display density to the column electrodes of the color liquid crystal display device, comprising a sampling circuit to sample the momentary voltage corresponding to the display picture elements out of the display signals that are input; the sampling circuit comprising a sampling capacitor, a sampling analog switch with one end connected to the said sampling capacitor and the other ends individually connected to two out of the red, green, blue display signal lines according to the color arrangement of the said color filter; a gate circuit to which color selection signals and display pattern signals are input to in turn output signals to selectively open and close one of the said sampling analog switches; and shift register circuit to output display pattern signals, with the output end connected to the said gate circuit.
Claim 10
Dependent Claim
151 words
A column electrode drive circuit to apply voltage according to the color arrangement of the color filter and display density to the column electrodes of the color liquid crystal display device, comprising a sampling circuit to sample the momentary voltage corresponding to the display picture elements out of the display signals that are input; the sampling circuit comprising a sampling capacitor, a sampling analog switch with one end connected to the said sampling capacitor and the other ends individually connected to two out of the red, green, blue display signal lines according to the color arrangement of the said color filter; a gate circuit to which color selection signals and display pattern signals are input to in turn output signals to selectively open and close one of the said sampling analog switches; and shift register circuit to output display pattern signals, with the output end connected to the said gate circuit.
Claim 11
Dependent Claim
139 words
An electrode drive circuit (13) for a colour liquid crystal display matrix comprising a sampling circuit for sampling the momentary data input voltage to derive a voltage to be applied to the electrode, the sampling circuit having at least one sampling analog switch (32,42,132,) a first end of which is connected to one of the three respective colour signal lines (VR,VG,VB) each providing a display data signal for a respective colour, the second end of which is connected to a sampling means (33,43), and the control input to which is connected to a switch signal line which provides a switch opening signal synchronised with the appearance on the colour signal line (VR,VG,VB) to which the first end of the switch (32,42,132) is connected of display data for a display cell (11c) of the matrix controlled by the electrode (llb,242).
Claim 12
Dependent Claim
139 words
An electrode drive circuit (13) for a colour liquid crystal display matrix comprising a sampling circuit for sampling the momentary data input voltage to derive a voltage to be applied to the electrode, the sampling circuit having at least one sampling analog switch (32,42,132,) a first end of which is connected to one of the three respective colour signal lines (VR,VG,VB) each providing a display data signal for a respective colour, the second end of which is connected to a sampling means (33,43), and the control input to which is connected to a switch signal line which provides a switch opening signal synchronised with the appearance on the colour signal line (VR,VG,VB) to which the first end of the switch (32,42,132) is connected of display data for a display cell (11c) of the matrix controlled by the electrode (llb,242).
Claim 13
Dependent Claim
207 words
An electrode drive circuit according to claim 6 for an electrode which controls a respective plurality of cells in a respective plurality of lines of the matrix which cells are not all of the same colour, the sampling circuit having a said sampling analog switch (32,42,132), the first end of which is connected to a respective said colour signal line (VR,VG,VB), for each respective colour of the cells controlled by the electrode, the respective control inputs to the switches being connected to respective switch signal lines which are connected to respective outputs of a gate arrangement (37,44,13) of the drive circuit, the gate arrangement having a colour selection control input (CR,CG,CB,C1,C2,C3) and a display synchronisation input (J) whereby the gate arrangement provides a said switch opening signal, during the input of display data for a line of the display, to the said switch signal line selected by the colour selection control input as appropriate for the respective cell controlled by the electrode which lies in the line of the display matrix for which data is being input, and synchronised by the display synchronisation input with the appearance on the said colour signal lines of display data for the position along the said line of the said cell.
Claim 14
Dependent Claim
20 words
A drive circuit according to claim 6 or claim 7 in which the said sampling means (32,43) is a capacitance.
Claim 15
Dependent Claim
47 words
A matrix type colour liquid crystal display device having a liquid crystal display matrix of cells of a plurality of colours and having a drive circuit according to any one of claims 6 to 8 for an electrode controlling a plurality of the cells of the matrix.
References Cited (Backward Citations)
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