Semiconductor circuits for driving current-driven display...

Details Semiconductor circuits for driving current-driven display... Semiconductor circuits for driving current-driven display...

2007-01-31

2010-10-19

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

C345S214000, C345S076000

Reexamination Certificate

active

07817149

ABSTRACT:
In a semiconductor circuit of a current output type, when display is performed by plural semiconductor circuit in one display panel, luminance unevenness for each block with a different semiconductor circuit occurs due to fluctuation in the semiconductor circuits.In current output stages14aand14b, current mirror circuits are constituted at both ends of a chip, and a reference current to be a reference of gradation display is supplied from both the ends. Moreover, by increasing a resistance value of a gate line of the current mirror circuit of distributing a current to each output, deviation of a transistor threshold value in the chip was compensated for, and output currents at left and right ends were matched. Moreover, reference currents were made the same by connecting resistors for reference current generation11cto11feach other at least between semiconductor circuits connected side by side, and fluctuation of current values across all semiconductor circuits decreased to 1% or less, whereby unevenness which occurred in boundaries of chips could be eliminated.

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