US4338600A
Expired / Lapsed
US
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Liquid crystal display system having temperature compensation
Assignee: Texas Instruments Inc
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Filing: 1980-07-14
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Granted: 1982-07-06
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Expires: 2000-07-14
Abstract
Abstract A data processing system is disclosed having data processing means for providing data in either an encoded format or in a display format in respective first and second operating modes. Temperature compensated, liquid crystal display means responsive to the operating mode of the data processing means are provided for receiving the data provided thereby, converting any data received in the encoded format to the display format, and displaying all received data in the display format.
Inventors
- 👤 Jerald G. Leach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:36
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133382; G09; G09G; G09G3/00; G09G3/04; G09G3/16; G09G3/18
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
71 words
A liquid crystal display system comprising: a liquid crystal display segment; display drive means for alternately coupling the segment to first and second voltages; and temperature compensation means for determining the ratio of the capacitance of the segment when coupled to the first voltage to the capacitance of the segment when coupled to the second voltage, and for changing the second voltage to converge said ratio toward a predetermined ratio value.
Claim 2
Dependent Claim
71 words
A liquid crystal display system comprising: a liquid crystal display segment; display drive means for alternately coupling the segment to first and second voltages; and temperature compensation means for determining the ratio of the capacitance of the segment when coupled to the first voltage to the capacitance of the segment when coupled to the second voltage, and for changing the second voltage to converge said ratio toward a predetermined ratio value.
Claim 3
Dependent Claim
16 words
The display system of claim 1 wherein the first and second voltages have predetermined RMS values.
Claim 4
Dependent Claim
19 words
The display system of claim 2 wherein the second voltage is changed by varying the duty cycle blanking thereof.
Claim 5
Dependent Claim
24 words
The display system of claim 1 or 2 wherein the first voltage has a predetermined value below a predetermined threshold voltage of said segment.
Claim 6
Dependent Claim
21 words
The display system of claim 4 wherein the second voltage has a selected value above said threshold voltage of said segment.
Claim 7
Dependent Claim
82 words
A display drive circuit for use in a liquid crystal display system having a liquid crystal display segment, the drive circuit comprising: display drive means for alternately coupling the segment to first and second voltages; and temperature compensation means for determining the ratio of the capacitance of the segment when coupled to the first voltage to the capacitance of the segment when coupled to the second voltage, and for changing the second voltage to converge said ratio toward a predetermined ratio value.
Claim 8
Dependent Claim
82 words
A display drive circuit for use in a liquid crystal display system having a liquid crystal display segment, the drive circuit comprising: display drive means for alternately coupling the segment to first and second voltages; and temperature compensation means for determining the ratio of the capacitance of the segment when coupled to the first voltage to the capacitance of the segment when coupled to the second voltage, and for changing the second voltage to converge said ratio toward a predetermined ratio value.
Claim 9
Dependent Claim
17 words
The display drive circuit of claim 6 wherein the first and second voltages have predetermined RMS values.
Claim 10
Dependent Claim
20 words
The display drive circuit of claim 7 wherein the second voltage is changed by varying the duty cycle blanking thereof.
Claim 11
Dependent Claim
21 words
The display drive circuit of claim 6 or 7 wherein the first voltage has a predetermined threshold voltage of said segment.
Claim 12
Dependent Claim
22 words
The display drive circuit of claim 9 wherein the second voltage has a selected value above said threshold voltage of said segment.
Claim 13
Dependent Claim
83 words
A liquid crystal display system comprising: first and second liquid crystal display segments; display drive means for coupling the first segment to a predetermined first voltage, and the second segment to a second voltage; and temperature compensation means for determining the ratio of the capacitance of the first segment when coupled to the first voltage to the capacitance of the second segment when coupled to the second voltage, and for changing the second voltage to converge said ratio toward a predetermined ratio value.
Claim 14
Dependent Claim
83 words
A liquid crystal display system comprising: first and second liquid crystal display segments; display drive means for coupling the first segment to a predetermined first voltage, and the second segment to a second voltage; and temperature compensation means for determining the ratio of the capacitance of the first segment when coupled to the first voltage to the capacitance of the second segment when coupled to the second voltage, and for changing the second voltage to converge said ratio toward a predetermined ratio value.
Claim 15
Dependent Claim
16 words
The display system of claim 11 wherein the first and second voltages have predetermined RMS values.
Claim 16
Dependent Claim
19 words
The display system of claim 12 wherein the second voltage is changed by varying the duty cycle blanking thereof.
Claim 17
Dependent Claim
24 words
The display system of claim 11 or 12 wherein the first voltage has a predetermined value below a predetermined threshold voltage of said segment.
Claim 18
Dependent Claim
22 words
The display system of claim 14 wherein the second voltage has has a selected value above said threshold voltage of said segment.
Claim 19
Dependent Claim
93 words
A display drive circuit for use in a liquid crystal display system having first and second liquid crystal display segments, the drive circuit comprising: display drive means for coupling the first segment to a first voltage, and the second segment to a second voltage; and temperature compensation means for determining the ratio of the capacitance of the first segment when coupled to the first voltage to the capacitance of the second segment when coupled to the second voltage, and for changing the second voltage to convert said ratio toward a predetermined ratio value.
Claim 20
Dependent Claim
93 words
A display drive circuit for use in a liquid crystal display system having first and second liquid crystal display segments, the drive circuit comprising: display drive means for coupling the first segment to a first voltage, and the second segment to a second voltage; and temperature compensation means for determining the ratio of the capacitance of the first segment when coupled to the first voltage to the capacitance of the second segment when coupled to the second voltage, and for changing the second voltage to convert said ratio toward a predetermined ratio value.
Claim 21
Dependent Claim
17 words
The display drive circuit of claim 16 wherein the first and second voltages have predetermined RMS values.
Claim 22
Dependent Claim
20 words
The display drive circuit of claim 17 wherein the second voltage is changed by varying the duty cycle blanking thereof.
Claim 23
Dependent Claim
25 words
The display drive circuit of claim 16 or 17 wherein the first voltage has a predetermined value below a predetermined threshold voltage of said segment.
Claim 24
Dependent Claim
22 words
The display drive circuit of claim 19 wherein the second voltage has a selected value above said threshold voltage of said segment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |