초록 ▼

A touch panel level set for a CRT including a plurality of energy paths crisscrossing the faceplate of the CRT includes a microprocessor for energizing and interrogating the energy paths on a regular basis. A specific threshold level for each energy path is regularly determined by the microprocessor

A touch panel level set for a CRT including a plurality of energy paths crisscrossing the faceplate of the CRT includes a microprocessor for energizing and interrogating the energy paths on a regular basis. A specific threshold level for each energy path is regularly determined by the microprocessor and retained in its memory. The specific threshold levels are used to compare the determined threshold levels in each energy path during interrogation thereof to ascertain whether the energy paths have been interrupted. Comparison is done on an analog basis with the memory output of the microprocessor being supplied through a D/A converter.

대표청구항 ▼

In a touch control panel having a plurality of crossing energy paths and means for repetitively testing the energy levels in said paths against stored test levels for said paths to determine if an interruption, corresponding to a touch, has occurred, a method of updating the stored test levels for s

In a touch control panel having a plurality of crossing energy paths and means for repetitively testing the energy levels in said paths against stored test levels for said paths to determine if an interruption, corresponding to a touch, has occurred, a method of updating the stored test levels for said paths comprising the steps of: energizing each of said paths in sequence; comparing the detected energy level in each of said paths with a nominal threshold level; A. (1) if the test indicates energy is detected, testing again with a maximum threshold level; (2) if at a maximum energy level, storing the maximum threshold level as the updated test level for that energy path; (3) if not at a maximum energy level, increasing the nominal threshold level and testing again; (4) continuing testing and increasing the threshold level until no energy is detected, and storing the last threshold level as the updated test level for that path; B. (1) if the test indicates no energy detected, testing for a minimum threshold level; (2) if at a minimum threshold level, storing the minimum threshold level as the updated test level for that path; (3) if the threshold level is not at a minimum, decreasing the threshold level by a predetermined amount; and (4) storing the decreased threshold level as the updated test level for that path.