Image Display System Gradation Correction via Segmented Drive Current
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Solution Overview
Problem
Existing image display systems, such as those using laser beams, face challenges in maintaining image gradation without disturbing the overall display, particularly when adjusting white balance, as changes in offset currents affect the entire image intensity.
Innovation Solution
An image display system that generates a drive current comprising a first current changing with gradation values and a second current that remains constant, with a processor adjusting the first current based on a set value and a corrector process to ensure the intensity difference between measured and target light beam intensities falls within a prescribed range, thereby correcting gradation without distorting the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the offset current is increased and reduced to search for optimal white balance, then the white balance is adjusted, but the gradation of the entire display image is increased and reduced which disturbs the display
Solution Approach 1:
The drive current is segmented into two independent components: a scale current that changes with gradation values and controls image brightness, and an offset current that does not change with gradation values and controls white balance. This segmentation allows independent adjustment of white balance without affecting display gradation, resolving the contradiction between white balance adjustment and gradation accuracy.
2Manufacturing precision
If the scale current is adjusted to correct gradation, then the gradation accuracy is improved, but the overall brightness of the display image is affected
Solution Approach 1:
By separating the drive current into scale current and offset current components, the system can adjust the scale current to correct gradation accuracy while the offset current maintains the overall brightness level. This independent control resolves the contradiction between gradation accuracy and display brightness.
Solution Approach 2:
The system changes the parameter of the scale current to correct gradation errors while keeping the offset current parameter constant to maintain brightness. This parameter change approach allows precise gradation correction without affecting overall display brightness.
3Power
If the drive current is increased to improve signal strength, then the light beam intensity is enhanced, but the power consumption increases
Solution Approach 1:
The system applies partial action by using only the necessary amount of scale current to achieve the required light beam intensity for each gradation level. By controlling the scale current dynamically based on gradation values rather than using excessive current continuously, the system achieves adequate power output while minimizing power consumption.
Data Source
AI summary
An image display system includes: a light source driver configured to supply, to a light source, a drive current including a first current and a second current; a processor configured to output the set value of the first current to the light source driver; and a corrector configured to perform a correction process on the first current. The processor is configured to set, based on a correspondence relationship between the gradation value and the current value of the first current, the set value of the first current to a current value determined with reference to the correspondence relationship when the gradation value is in a second gradation range in which numerical values are smaller than numerical values in the first gradation range, the correction process correcting the correspondence relationship such that a difference between a measured intensity and a target intensity of the light source falls within a prescribed range.