Method and system for measuring characteristics of liquid crystal display driver chips
A measuring method and system for liquid crystal display driver chips applies a new method to measure voltages of driver chips, and utilizes probability and statistics for analysis and determination so as to yield a rather accurate effect even under noisy environments. Accordingly, analog-to-digital converters can be replaced for faster sampling. The measuring method and system can be implemented using comparator circuits or pin electronics cards so that the measuring procedure for driver chips is simplified. Measured results are analyzed and verified by application of probability and statistics. As such, testing of liquid crystal display driver chips is more accurate, testing time is reduced, and accuracy level is promoted.
1. A method of measuring characteristics of liquid crystal display driver chips, comprising:
through a measuring unit of a system, outputting at least a value, from which an actual value of a signal can be determined;
based on noise distribution of the measuring unit, distributing signal positions among different areas;
double-integrating density of each area to obtain a probability curve for each area;
obtaining voltage values by repeated sampling of the probability curves through interpolation; and
computing correct tested voltage values by weighted averaging calculation of the voltage values.
2. The method of claim 1 , wherein an input end of the measuring unit further includes a device under test and a stable voltage source.
3. The method of claim 1 , wherein the probability of the value of the voltage to be tested as falling in each area varies in accordance with the output value of the measuring unit.
4. The method of claim 1 , wherein the number of sampling points is proportional to the measuring accuracy and confidence level.
5. The method of claim 1 , wherein predicted voltage ranges of the probability curves include the voltage value to be measured.
6. The method of claim 1 , wherein accuracy of voltage measurement comparable to or higher than that of the IEEE1057 test standard can be achieved with a smaller number of sampling points.
7. The method of claim 1 , wherein accuracy is defined as the difference between measured result and simulated result divided by the root mean square of noise.