Pulse signal generator and display device
First Claim
1. A pulse signal generator comprising:
- the pulse signal generator generates plural pulse signals and comprises;
a pulse arrival notification means that reports the arrival of a pulse, which is contained in the input pulse string and which is input when an enable signal indicating permission for pulse input is given, together with the information that specifies said pulse;
a pulse arrival judgment means, which uses pulse assignment signals corresponding to said pulse signals to be generated as input, and which determines whether a pulse assigned with each of said pulse assignment signals has arrived for each of said pulse signals on the basis of the notification of said pulse arrival notification means;
and a pulse signal output means that inverts the output level of pulse signal, for which arrival of said assigned pulse is judged by said pulse arrival judgment means, synchronization with the arrival of said pulse.
1 Assignment
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Accused Products
Abstract
The objective of this invention is to provide a pulse signal generator with a simple constitution that can reduce the number of signals required for setting the pulse width, as well as a display device using said pulse signal generator. Pulse assignment signal DP0 input to the initial stage of pulse signal generating units PG(i,0)–PG(i,39) connected in cascade is sequentially transferred towards the last stage of the cascade connection. After transfer of the pulse assignment signal to the pulse signal generating unit in each stage, the count value of said pulse signal generating unit is initialized. Then, the pulses of pulse strings PS0–PS39 in the various pulse signal generating units are counted. The count value of the pulse string is compared to the pulse assignment signal in the comparison unit of each pulse signal generating unit, and, in accordance with the comparison result, the level of the drive pulse signal of the LED is inverted. The pulse intervals (pulse timing) of pulse strings PS0–PS39 are controlled individually by control unit 1 so that the drive pulse signal output from the pulse signal generating unit has the desired pulse width.
10 Citations
20 Claims
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1. A pulse signal generator comprising:
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the pulse signal generator generates plural pulse signals and comprises; a pulse arrival notification means that reports the arrival of a pulse, which is contained in the input pulse string and which is input when an enable signal indicating permission for pulse input is given, together with the information that specifies said pulse; a pulse arrival judgment means, which uses pulse assignment signals corresponding to said pulse signals to be generated as input, and which determines whether a pulse assigned with each of said pulse assignment signals has arrived for each of said pulse signals on the basis of the notification of said pulse arrival notification means; and a pulse signal output means that inverts the output level of pulse signal, for which arrival of said assigned pulse is judged by said pulse arrival judgment means, synchronization with the arrival of said pulse. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A display device comprising:
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plural display elements; one or more pulse signal generators that generate plural pulse strings for driving said display elements; and a control means that generates a pulse string with its pulse interval set corresponding to a desired pulse width of said pulse signal, and a pulse assignment signal that assigns the prescribed pulse in said input pulse string for each said pulse signal to be generated, and sends said signals to said pulse signal generators; wherein said pulse signal generator comprises; a pulse arrival notification means that reports the arrival of the pulse, which is contained in the input pulse string and which is input when an enable signal indicating permission for pulse input is given, together with the information that specifies said pulse; a pulse arrival judgment means, which uses the pulse assignment signals corresponding to said pulse signals to be generated as input, and which determines whether a pulse assigned with each of said pulse assignment signals has arrived for each of said pulse signals on the basis of the notification of said pulse arrival notification means; and a pulse signal output means that inverts the output level of the pulse signal, for which arrival of said assigned pulse is judged by said pulse arrival judgment means, synchronously with the arrival of said pulse. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 19, 20)
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15. A pulse signal generator comprising:
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a pulse signal generator is used to control a logic level of an output pulse signal corresponding to arrival of a pulse signal; wherein the pulse signal generator comprises a pulse assignment signal holding circuit that holds a pulse assignment signal for assigning one pulse signal in a pulse string supplied during a prescribed period as a response to an initialization signal, a counting circuit, which resets a count value at a prescribed value as a response to said initialization signal, and which increments or decrements said count value corresponding to input of said pulse signal, a comparator that compares a value of the pulse assignment signal held in said pulse assignment signal holding circuit with said count value of said counting circuit; and a pulse signal output circuit that controls a logic level of said output pulse signal in response to a comparison result signal output from said comparator. - View Dependent Claims (16, 17, 18)
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Specification