US 2018/0293926 A1Published application

Display driving circuit

AssigneeNovatek Microelectronics Corp.

InventorsYu-Kuang CHANG, Kuei-Chung CHANG, Ming-Da CHIANG

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Abstract

A display driving circuit comprising a video signal transformation circuit, a reference voltage generating circuit, a DAC and an interpolation operational amplifier is provided. The video signal transformation circuit transforms an input video signal into a transformed video signal with a higher bit depth. The transformed video signal comprises an upper n bits data and a lower m bits data, wherein n+m equals a bit depth of the transformed video signal. The reference voltage generating circuit generates reference voltages. The DAC selects a first reference voltage and a second reference voltage to interpolation operational amplifier from the reference voltages according to an upper n bits data of the transformed video signal. The interpolation operational amplifier outputs a driving voltage to display device according to the first reference voltage, the second reference voltage and the lower m bits data of the transformed video signal.

Claims4

Dependent claims

A display driving circuit, comprising:

a video signal transformation circuit for transforming an input video signal into a transformed video signal having a bit depth higher than that of the input video signal according to one or more look-up tables wherein a bit depth of the input video signal is a first number, the bit depth of the transformed video signal is a second number;
a digital to analog converter (DAC) coupled to the video signal transformation circuit, configured to select a first reference voltage and a second reference voltage from a plurality of reference voltages according to at least a third number of bits of data of the transformed video signal, wherein the third number is less than the second number and the number of the reference voltages is less than 2 m, where m denotes the first number;
and
an operational amplifier coupled to the digital to analog converter and configured to perform interpolation on the first and second reference voltages so as to generate a driving voltage corresponding to the second number of bits of the transformed video signal.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/010,242Filed 15 Jun 2018
Priority: TW 10010313327 Jan 2011
Published: 11 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G09G 3/2003
For presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged…:…
G09G 2310/0297
Details of driving circuits: special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a…
G09G 2320/0276
Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping: for the purpose of adaptation to…
G09G 2320/0673
Adjustment of display parameters: for control of gamma adjustment, e.g. selecting another gamma curve

Family

Application13/357,197Reissue · filed 24 Jan 2012
Application14/253,900Continuation · filed 16 Apr 2014
Application14/822,422Division · filed 10 Aug 2015
Application16/010,242Division
Application14/822,422Continuation
Application14/253,900Reissue
US 2012/0194745 A1Published application
US 2017/0046993 A1Published application
US 8,497,943 B2Related patent
US RE45,707 E1Related patent
US 2018/0293926 A1This patent

From the US filing history. Foreign family members aren’t listed.