Display Device Pulse Width Modulator Low Current Consumption
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Solution Overview
Problem
Display devices face increased current consumption when operating continuously with short unit times to maintain high resolution, necessitating a solution to reduce power usage while preserving image quality.
Innovation Solution
A display device with a pulse width modulator that generates a modulation signal by combining macro and micro data, where the macro modulation part and micro modulation part adjust their activation widths based on specific time units, allowing for high-resolution image display with reduced current consumption by disabling micro modulation in inactive subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the unit time is shortened to maintain high resolution display, then the display resolution is improved, but the current consumption is increased
Solution Approach 1:
The patent divides the frame data into macro data and micro data, and divides the unit frame into multiple subframes. The macro modulation part processes macro data with activation width in macro unit times, while the micro modulation part processes micro data with activation width in micro unit times. This segmentation allows selective activation of modulation parts, reducing overall current consumption while maintaining high display resolution through the micro modulation component.
2Illumination intensity
If the activation width of modulation signal is increased to improve display brightness, then the luminous energy is improved, but the current consumption is increased
Solution Approach 1:
The patent dynamically adjusts the activation width of modulation signals based on the data values of macro data and micro data. The macro modulation part generates macro response signals with activation widths corresponding to macro data values, and the micro modulation part generates micro response signals with activation widths corresponding to micro data values. This dynamic adjustment allows optimal brightness control while minimizing current consumption by activating only the necessary modulation depth.
3Measurement precision
If the macro modulation part and micro modulation part are continuously activated to maintain high resolution, then the display quality is improved, but the current consumption is increased
Solution Approach 1:
The patent implements periodic action by dividing the unit frame into multiple subframes (1st to n-th subframes) and selectively activating the micro modulation part in specific subframes based on micro disable signal generation. The micro modulation part is activated only when needed to maintain high resolution, while being deactivated in other subframes to reduce current consumption. This periodic activation pattern maintains display quality while significantly reducing power usage.
Data Source
AI summary
Disclosed herein is to a display device with high resolution of display image and low current consumption. In the display device of the disclosure, the activation width of a modulation signal that causes a current to flow in a light emitting element of a display panel, reflects an activation width of a micro response signal that can be divided into a short unit time. Accordingly, the light emitting element that emits light with a brightness corresponding to the activation width of the modulation signal, can implement a high-resolution display image. The micro modulation part that includes a high frequency clock generating unit and a micro modulation unit, is disabled in a subframe in which the micro response signal is inactivated. Therefore, according to the display device of the disclosure, current consumption can be reduced with maintaining a high resolution of a display image.