Liquid Crystal Display Driving Circuit Backlight Brightness Control
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Solution Overview
Problem
The energy consumption of liquid crystal display devices is high, with the backlight module accounting for 70%-80% of the total energy usage, limiting battery size and capacity, and reducing brightness to extend endurance results in poor display performance.
Innovation Solution
A liquid crystal display driving circuit incorporating a content adaptive brightness control circuit and a Gamma voltage adjustment circuit that dynamically adjusts backlight brightness and grayscale voltage to maintain image brightness while reducing energy consumption, using a Gamma curve feedback circuit, control circuit, storage circuit, line buffer, D/A converter, and level shifter to optimize backlight and grayscale settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the brightness of the backlight module is reduced to extend battery endurance, then energy consumption is reduced, but display brightness and visual quality deteriorate
Solution Approach 1:
The patent changes the Gamma voltage parameter dynamically based on backlight brightness levels. When backlight brightness is reduced, the Gamma voltage is adjusted to compensate, thereby maintaining perceived display brightness while consuming less energy. This parameter adjustment resolves the contradiction between energy saving and display quality.
Solution Approach 2:
The patent implements a feedback mechanism where the display brightness is detected and used to adjust the Gamma voltage accordingly. This closed-loop control ensures that when backlight brightness changes, the Gamma voltage is automatically adjusted to maintain consistent perceived brightness, resolving the trade-off between energy consumption and display quality.
2Illumination intensity
If the battery size and capacity are increased to maintain display brightness, then display quality is improved, but device volume and weight increase
Solution Approach 1:
By dynamically adjusting the Gamma voltage parameter in response to backlight brightness changes, the patent maintains display brightness without requiring a larger battery. This parameter optimization allows the same battery capacity to sustain higher display quality over the same period, avoiding increased device volume.
3Illumination intensity
If the Gamma voltage is adjusted to compensate for reduced backlight brightness, then perceived display brightness is maintained, but circuit complexity increases
Solution Approach 1:
The Gamma voltage adjustment circuit is designed to perform multiple functions: it adjusts Gamma voltage based on backlight brightness, maintains perceived display brightness, and works across different display content types. This multi-functionality reduces the need for separate circuits for different scenarios, thereby managing complexity while achieving brightness compensation.
4Use of energy by moving object
If dynamic brightness adjustment is implemented, then energy consumption is optimized, but control circuit complexity increases
Solution Approach 1:
The patent optimizes energy consumption by dynamically changing the Gamma voltage parameter based on backlight brightness levels. This single parameter adjustment approach simplifies the control logic compared to more complex multi-parameter control systems, thereby reducing control circuit complexity while achieving energy optimization.
Data Source
AI summary
The disclosure provides a liquid crystal display driving circuit and a liquid crystal display device. The liquid crystal display driving circuit includes a content adaptive brightness control circuit and a Gamma voltage adjustment circuit, when the content adaptive brightness control circuit is turned on, the brightness of the backlight module is switched from first backlight brightness to second backlight brightness under the control of the content adaptive brightness control circuit, when the brightness of the backlight module is the first backlight brightness, the Gamma voltage adjustment circuit outputs a first Gamma voltage for adjusting grayscale brightness of the liquid crystal display to be first grayscale brightness, when the brightness of the backlight module is the second backlight brightness, the Gamma voltage adjustment circuit outputs a second Gamma voltage for adjusting the grayscale brightness of the liquid crystal display to be second grayscale brightness.