Patent ID: 8379063
Filing Date: 2013-02-19
Classification: G09G

Abstract:
1. A device for producing light at different pixels displayed on a panel, comprising: a panel; a digital controller that produces digital pixel signals that represent, respectively, pixel brightness levels of pixels displayed on the panel; a digital to analog conversion (DAC) circuit module configured to have preset DAC levels and coupled to the digital controller to receive the digital pixel signals, the DAC circuit module operable to convert the digital pixel signals into analog pixel signals at respective DAC levels; a light producing module that emits light and receives the analog pixel signals to cause, by using the emitted light, illumination of individual pixels displayed on the panel based on respective DAC levels of the pixels, wherein the illumination of each individual pixel exhibits a stable brightness region in which each pixel produces stable illumination and an unstable brightness region in which each pixel produces unstable illumination; and a control mechanism that controls a block of a predetermined size of adjacent pixels displayed on the panel to selectively operate the DAC circuit module to cause one or more pixels in the block at a first DAC level and one or more other pixels in the block at a second DAC level different from the first DAC level to achieve a perceived spatial block average brightness level for the block between a first brightness level corresponding to the first DAC level and a second brightness level corresponding to the second DAC level where a difference between the first brightness level corresponding to the first DAC level and the second brightness level corresponding to the second DAC level represents a resolution limit of the DAC circuit module, the control mechanism further controlling the DAC circuit module, when a pixel within the block is to be dictated by a digital pixel signal to operate within a respective unstable brightness region, to operate one or more pixels in the block at a DAC level below the unstable brightness region and one or more other pixels in the block at a different DAC level above the respective unstable brightness region, to achieve a perceived spatial block brightness level within the respective unstable brightness region.